DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (5350524bb654)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* state and methods used while laying out a single line of a block frame */

// This has to be defined before nsLineLayout.h is included, because
// nsLineLayout.h has a #include for plarena.h, which needs this defined:
#define PL_ARENA_CONST_ALIGN_MASK (sizeof(void*)-1)
#include "nsLineLayout.h"

#include "LayoutLogging.h"
#include "SVGTextFrame.h"
#include "nsBlockFrame.h"
#include "nsFontMetrics.h"
#include "nsStyleConsts.h"
#include "nsContainerFrame.h"
#include "nsFloatManager.h"
#include "nsStyleContext.h"
#include "nsPresContext.h"
#include "nsGkAtoms.h"
#include "nsIContent.h"
#include "nsLayoutUtils.h"
#include "nsTextFrame.h"
#include "nsStyleStructInlines.h"
#include "nsBidiPresUtils.h"
#include "nsRubyFrame.h"
#include "nsRubyTextFrame.h"
#include "RubyUtils.h"
#include <algorithm>

#ifdef DEBUG
#undef  NOISY_INLINEDIR_ALIGN
#undef  NOISY_BLOCKDIR_ALIGN
#undef  NOISY_REFLOW
#undef  REALLY_NOISY_REFLOW
#undef  NOISY_PUSHING
#undef  REALLY_NOISY_PUSHING
#undef  NOISY_CAN_PLACE_FRAME
#undef  NOISY_TRIM
#undef  REALLY_NOISY_TRIM
#endif

using namespace mozilla;

//----------------------------------------------------------------------

#define FIX_BUG_50257

nsLineLayout::nsLineLayout(nsPresContext* aPresContext,
                           nsFloatManager* aFloatManager,
                           const ReflowInput* aOuterReflowInput,
                           const nsLineList::iterator* aLine,
                           nsLineLayout* aBaseLineLayout)
  : mPresContext(aPresContext),
    mFloatManager(aFloatManager),
    mBlockReflowInput(aOuterReflowInput),
    mBaseLineLayout(aBaseLineLayout),
    mLastOptionalBreakFrame(nullptr),
    mForceBreakFrame(nullptr),
    mBlockRI(nullptr),/* XXX temporary */
    mLastOptionalBreakPriority(gfxBreakPriority::eNoBreak),
    mLastOptionalBreakFrameOffset(-1),
    mForceBreakFrameOffset(-1),
    mMinLineBSize(0),
    mTextIndent(0),
    mFirstLetterStyleOK(false),
    mIsTopOfPage(false),
    mImpactedByFloats(false),
    mLastFloatWasLetterFrame(false),
    mLineIsEmpty(false),
    mLineEndsInBR(false),
    mNeedBackup(false),
    mInFirstLine(false),
    mGotLineBox(false),
    mInFirstLetter(false),
    mHasBullet(false),
    mDirtyNextLine(false),
    mLineAtStart(false),
    mHasRuby(false),
    mSuppressLineWrap(aOuterReflowInput->mFrame->IsSVGText())
{
  MOZ_ASSERT(aOuterReflowInput, "aOuterReflowInput must not be null");
  NS_ASSERTION(aFloatManager || aOuterReflowInput->mFrame->GetType() ==
                                  nsGkAtoms::letterFrame,
               "float manager should be present");
  MOZ_ASSERT((!!mBaseLineLayout) ==
             (aOuterReflowInput->mFrame->GetType() ==
              nsGkAtoms::rubyTextContainerFrame),
             "Only ruby text container frames have "
             "a different base line layout");
  MOZ_COUNT_CTOR(nsLineLayout);

  // Stash away some style data that we need
  nsBlockFrame* blockFrame = do_QueryFrame(aOuterReflowInput->mFrame);
  if (blockFrame)
    mStyleText = blockFrame->StyleTextForLineLayout();
  else
    mStyleText = aOuterReflowInput->mFrame->StyleText();

  mLineNumber = 0;
  mTotalPlacedFrames = 0;
  mBStartEdge = 0;
  mTrimmableISize = 0;

  mInflationMinFontSize =
    nsLayoutUtils::InflationMinFontSizeFor(aOuterReflowInput->mFrame);

  // Instead of always pre-initializing the free-lists for frames and
  // spans, we do it on demand so that situations that only use a few
  // frames and spans won't waste a lot of time in unneeded
  // initialization.
  PL_INIT_ARENA_POOL(&mArena, "nsLineLayout", 1024);
  mFrameFreeList = nullptr;
  mSpanFreeList = nullptr;

  mCurrentSpan = mRootSpan = nullptr;
  mSpanDepth = 0;

  if (aLine) {
    mGotLineBox = true;
    mLineBox = *aLine;
  }
}

nsLineLayout::~nsLineLayout()
{
  MOZ_COUNT_DTOR(nsLineLayout);

  NS_ASSERTION(nullptr == mRootSpan, "bad line-layout user");

  PL_FinishArenaPool(&mArena);
}

// Find out if the frame has a non-null prev-in-flow, i.e., whether it
// is a continuation.
inline bool
HasPrevInFlow(nsIFrame *aFrame)
{
  nsIFrame *prevInFlow = aFrame->GetPrevInFlow();
  return prevInFlow != nullptr;
}

void
nsLineLayout::BeginLineReflow(nscoord aICoord, nscoord aBCoord,
                              nscoord aISize, nscoord aBSize,
                              bool aImpactedByFloats,
                              bool aIsTopOfPage,
                              WritingMode aWritingMode,
                              const nsSize& aContainerSize)
{
  NS_ASSERTION(nullptr == mRootSpan, "bad linelayout user");
  LAYOUT_WARN_IF_FALSE(aISize != NS_UNCONSTRAINEDSIZE,
                       "have unconstrained width; this should only result from "
                       "very large sizes, not attempts at intrinsic width "
                       "calculation");
#ifdef DEBUG
  if ((aISize != NS_UNCONSTRAINEDSIZE) && CRAZY_SIZE(aISize) &&
      !LineContainerFrame()->GetParent()->IsCrazySizeAssertSuppressed()) {
    nsFrame::ListTag(stdout, mBlockReflowInput->mFrame);
    printf(": Init: bad caller: width WAS %d(0x%x)\n",
           aISize, aISize);
  }
  if ((aBSize != NS_UNCONSTRAINEDSIZE) && CRAZY_SIZE(aBSize) &&
      !LineContainerFrame()->GetParent()->IsCrazySizeAssertSuppressed()) {
    nsFrame::ListTag(stdout, mBlockReflowInput->mFrame);
    printf(": Init: bad caller: height WAS %d(0x%x)\n",
           aBSize, aBSize);
  }
#endif
#ifdef NOISY_REFLOW
  nsFrame::ListTag(stdout, mBlockReflowInput->mFrame);
  printf(": BeginLineReflow: %d,%d,%d,%d impacted=%s %s\n",
         aICoord, aBCoord, aISize, aBSize,
         aImpactedByFloats?"true":"false",
         aIsTopOfPage ? "top-of-page" : "");
#endif
#ifdef DEBUG
  mSpansAllocated = mSpansFreed = mFramesAllocated = mFramesFreed = 0;
#endif

  mFirstLetterStyleOK = false;
  mIsTopOfPage = aIsTopOfPage;
  mImpactedByFloats = aImpactedByFloats;
  mTotalPlacedFrames = 0;
  if (!mBaseLineLayout) {
    mLineIsEmpty = true;
    mLineAtStart = true;
  } else {
    mLineIsEmpty = false;
    mLineAtStart = false;
  }
  mLineEndsInBR = false;
  mSpanDepth = 0;
  mMaxStartBoxBSize = mMaxEndBoxBSize = 0;

  if (mGotLineBox) {
    mLineBox->ClearHasBullet();
  }

  PerSpanData* psd = NewPerSpanData();
  mCurrentSpan = mRootSpan = psd;
  psd->mReflowInput = mBlockReflowInput;
  psd->mIStart = aICoord;
  psd->mICoord = aICoord;
  psd->mIEnd = aICoord + aISize;
  mContainerSize = aContainerSize;

  mBStartEdge = aBCoord;

  psd->mNoWrap = !mStyleText->WhiteSpaceCanWrapStyle() || mSuppressLineWrap;
  psd->mWritingMode = aWritingMode;

  // If this is the first line of a block then see if the text-indent
  // property amounts to anything.

  if (0 == mLineNumber && !HasPrevInFlow(mBlockReflowInput->mFrame)) {
    const nsStyleCoord &textIndent = mStyleText->mTextIndent;
    nscoord pctBasis = 0;
    if (textIndent.HasPercent()) {
      pctBasis =
        mBlockReflowInput->GetContainingBlockContentISize(aWritingMode);
    }
    nscoord indent = nsRuleNode::ComputeCoordPercentCalc(textIndent, pctBasis);

    mTextIndent = indent;

    psd->mICoord += indent;
  }

  PerFrameData* pfd = NewPerFrameData(mBlockReflowInput->mFrame);
  pfd->mAscent = 0;
  pfd->mSpan = psd;
  psd->mFrame = pfd;
  nsIFrame* frame = mBlockReflowInput->mFrame;
  if (frame->GetType() == nsGkAtoms::rubyTextContainerFrame) {
    // Ruby text container won't be reflowed via ReflowFrame, hence the
    // relative positioning information should be recorded here.
    MOZ_ASSERT(mBaseLineLayout != this);
    pfd->mRelativePos =
      mBlockReflowInput->mStyleDisplay->IsRelativelyPositionedStyle();
    if (pfd->mRelativePos) {
      MOZ_ASSERT(
        mBlockReflowInput->GetWritingMode() == pfd->mWritingMode,
        "mBlockReflowInput->frame == frame, "
        "hence they should have identical writing mode");
      pfd->mOffsets = mBlockReflowInput->ComputedLogicalOffsets();
    }
  }
}

void
nsLineLayout::EndLineReflow()
{
#ifdef NOISY_REFLOW
  nsFrame::ListTag(stdout, mBlockReflowInput->mFrame);
  printf(": EndLineReflow: width=%d\n", mRootSpan->mICoord - mRootSpan->mIStart);
#endif

  NS_ASSERTION(!mBaseLineLayout ||
               (!mSpansAllocated && !mSpansFreed && !mSpanFreeList &&
                !mFramesAllocated && !mFramesFreed && !mFrameFreeList),
               "Allocated frames or spans on non-base line layout?");

  UnlinkFrame(mRootSpan->mFrame);
  mCurrentSpan = mRootSpan = nullptr;

  NS_ASSERTION(mSpansAllocated == mSpansFreed, "leak");
  NS_ASSERTION(mFramesAllocated == mFramesFreed, "leak");

#if 0
  static int32_t maxSpansAllocated = NS_LINELAYOUT_NUM_SPANS;
  static int32_t maxFramesAllocated = NS_LINELAYOUT_NUM_FRAMES;
  if (mSpansAllocated > maxSpansAllocated) {
    printf("XXX: saw a line with %d spans\n", mSpansAllocated);
    maxSpansAllocated = mSpansAllocated;
  }
  if (mFramesAllocated > maxFramesAllocated) {
    printf("XXX: saw a line with %d frames\n", mFramesAllocated);
    maxFramesAllocated = mFramesAllocated;
  }
#endif
}

// XXX swtich to a single mAvailLineWidth that we adjust as each frame
// on the line is placed. Each span can still have a per-span mICoord that
// tracks where a child frame is going in its span; they don't need a
// per-span mIStart?

void
nsLineLayout::UpdateBand(WritingMode aWM,
                         const LogicalRect& aNewAvailSpace,
                         nsIFrame* aFloatFrame)
{
  WritingMode lineWM = mRootSpan->mWritingMode;
  // need to convert to our writing mode, because we might have a different
  // mode from the caller due to dir: auto
  LogicalRect availSpace = aNewAvailSpace.ConvertTo(lineWM, aWM,
                                                    ContainerSize());
#ifdef REALLY_NOISY_REFLOW
  printf("nsLL::UpdateBand %d, %d, %d, %d, (converted to %d, %d, %d, %d); frame=%p\n  will set mImpacted to true\n",
         aNewAvailSpace.IStart(aWM), aNewAvailSpace.BStart(aWM),
         aNewAvailSpace.ISize(aWM), aNewAvailSpace.BSize(aWM),
         availSpace.IStart(lineWM), availSpace.BStart(lineWM),
         availSpace.ISize(lineWM), availSpace.BSize(lineWM),
         aFloatFrame);
#endif
#ifdef DEBUG
  if ((availSpace.ISize(lineWM) != NS_UNCONSTRAINEDSIZE) &&
      CRAZY_SIZE(availSpace.ISize(lineWM)) &&
      !LineContainerFrame()->GetParent()->IsCrazySizeAssertSuppressed()) {
    nsFrame::ListTag(stdout, mBlockReflowInput->mFrame);
    printf(": UpdateBand: bad caller: ISize WAS %d(0x%x)\n",
           availSpace.ISize(lineWM), availSpace.ISize(lineWM));
  }
  if ((availSpace.BSize(lineWM) != NS_UNCONSTRAINEDSIZE) &&
      CRAZY_SIZE(availSpace.BSize(lineWM)) &&
      !LineContainerFrame()->GetParent()->IsCrazySizeAssertSuppressed()) {
    nsFrame::ListTag(stdout, mBlockReflowInput->mFrame);
    printf(": UpdateBand: bad caller: BSize WAS %d(0x%x)\n",
           availSpace.BSize(lineWM), availSpace.BSize(lineWM));
  }
#endif

  // Compute the difference between last times width and the new width
  NS_WARNING_ASSERTION(
    mRootSpan->mIEnd != NS_UNCONSTRAINEDSIZE &&
    availSpace.ISize(lineWM) != NS_UNCONSTRAINEDSIZE,
    "have unconstrained inline size; this should only result from very large "
    "sizes, not attempts at intrinsic width calculation");
  // The root span's mIStart moves to aICoord
  nscoord deltaICoord = availSpace.IStart(lineWM) - mRootSpan->mIStart;
  // The inline size of all spans changes by this much (the root span's
  // mIEnd moves to aICoord + aISize, its new inline size is aISize)
  nscoord deltaISize = availSpace.ISize(lineWM) -
                       (mRootSpan->mIEnd - mRootSpan->mIStart);
#ifdef NOISY_REFLOW
  nsFrame::ListTag(stdout, mBlockReflowInput->mFrame);
  printf(": UpdateBand: %d,%d,%d,%d deltaISize=%d deltaICoord=%d\n",
         availSpace.IStart(lineWM), availSpace.BStart(lineWM),
         availSpace.ISize(lineWM), availSpace.BSize(lineWM),
         deltaISize, deltaICoord);
#endif

  // Update the root span position
  mRootSpan->mIStart += deltaICoord;
  mRootSpan->mIEnd += deltaICoord;
  mRootSpan->mICoord += deltaICoord;

  // Now update the right edges of the open spans to account for any
  // change in available space width
  for (PerSpanData* psd = mCurrentSpan; psd; psd = psd->mParent) {
    psd->mIEnd += deltaISize;
    psd->mContainsFloat = true;
#ifdef NOISY_REFLOW
    printf("  span %p: oldIEnd=%d newIEnd=%d\n",
           psd, psd->mIEnd - deltaISize, psd->mIEnd);
#endif
  }
  NS_ASSERTION(mRootSpan->mContainsFloat &&
               mRootSpan->mIStart == availSpace.IStart(lineWM) &&
               mRootSpan->mIEnd == availSpace.IEnd(lineWM),
               "root span was updated incorrectly?");

  // Update frame bounds
  // Note: Only adjust the outermost frames (the ones that are direct
  // children of the block), not the ones in the child spans. The reason
  // is simple: the frames in the spans have coordinates local to their
  // parent therefore they are moved when their parent span is moved.
  if (deltaICoord != 0) {
    for (PerFrameData* pfd = mRootSpan->mFirstFrame; pfd; pfd = pfd->mNext) {
      pfd->mBounds.IStart(lineWM) += deltaICoord;
    }
  }

  mBStartEdge = availSpace.BStart(lineWM);
  mImpactedByFloats = true;

  mLastFloatWasLetterFrame = nsGkAtoms::letterFrame == aFloatFrame->GetType();
}

nsLineLayout::PerSpanData*
nsLineLayout::NewPerSpanData()
{
  nsLineLayout* outerLineLayout = GetOutermostLineLayout();
  PerSpanData* psd = outerLineLayout->mSpanFreeList;
  if (!psd) {
    void *mem;
    size_t sz = sizeof(PerSpanData);
    PL_ARENA_ALLOCATE(mem, &outerLineLayout->mArena, sz);
    if (!mem) {
      NS_ABORT_OOM(sz);
    }
    psd = reinterpret_cast<PerSpanData*>(mem);
  }
  else {
    outerLineLayout->mSpanFreeList = psd->mNextFreeSpan;
  }
  psd->mParent = nullptr;
  psd->mFrame = nullptr;
  psd->mFirstFrame = nullptr;
  psd->mLastFrame = nullptr;
  psd->mContainsFloat = false;
  psd->mHasNonemptyContent = false;

#ifdef DEBUG
  outerLineLayout->mSpansAllocated++;
#endif
  return psd;
}

void
nsLineLayout::BeginSpan(nsIFrame* aFrame,
                        const ReflowInput* aSpanReflowInput,
                        nscoord aIStart, nscoord aIEnd,
                        nscoord* aBaseline)
{
  NS_ASSERTION(aIEnd != NS_UNCONSTRAINEDSIZE,
               "should no longer be using unconstrained sizes");
#ifdef NOISY_REFLOW
  nsFrame::IndentBy(stdout, mSpanDepth+1);
  nsFrame::ListTag(stdout, aFrame);
  printf(": BeginSpan leftEdge=%d rightEdge=%d\n", aIStart, aIEnd);
#endif

  PerSpanData* psd = NewPerSpanData();
  // Link up span frame's pfd to point to its child span data
  PerFrameData* pfd = mCurrentSpan->mLastFrame;
  NS_ASSERTION(pfd->mFrame == aFrame, "huh?");
  pfd->mSpan = psd;

  // Init new span
  psd->mFrame = pfd;
  psd->mParent = mCurrentSpan;
  psd->mReflowInput = aSpanReflowInput;
  psd->mIStart = aIStart;
  psd->mICoord = aIStart;
  psd->mIEnd = aIEnd;
  psd->mBaseline = aBaseline;

  nsIFrame* frame = aSpanReflowInput->mFrame;
  psd->mNoWrap = !frame->StyleText()->WhiteSpaceCanWrap(frame) ||
                 mSuppressLineWrap ||
                 frame->StyleContext()->ShouldSuppressLineBreak();
  psd->mWritingMode = aSpanReflowInput->GetWritingMode();

  // Switch to new span
  mCurrentSpan = psd;
  mSpanDepth++;
}

nscoord
nsLineLayout::EndSpan(nsIFrame* aFrame)
{
  NS_ASSERTION(mSpanDepth > 0, "end-span without begin-span");
#ifdef NOISY_REFLOW
  nsFrame::IndentBy(stdout, mSpanDepth);
  nsFrame::ListTag(stdout, aFrame);
  printf(": EndSpan width=%d\n", mCurrentSpan->mICoord - mCurrentSpan->mIStart);
#endif
  PerSpanData* psd = mCurrentSpan;
  nscoord iSizeResult = psd->mLastFrame ? (psd->mICoord - psd->mIStart) : 0;

  mSpanDepth--;
  mCurrentSpan->mReflowInput = nullptr;  // no longer valid so null it out!
  mCurrentSpan = mCurrentSpan->mParent;
  return iSizeResult;
}

void
nsLineLayout::AttachFrameToBaseLineLayout(PerFrameData* aFrame)
{
  NS_PRECONDITION(mBaseLineLayout,
                  "This method must not be called in a base line layout.");

  PerFrameData* baseFrame = mBaseLineLayout->LastFrame();
  MOZ_ASSERT(aFrame && baseFrame);
  MOZ_ASSERT(!aFrame->mIsLinkedToBase,
             "The frame must not have been linked with the base");
#ifdef DEBUG
  nsIAtom* baseType = baseFrame->mFrame->GetType();
  nsIAtom* annotationType = aFrame->mFrame->GetType();
  MOZ_ASSERT((baseType == nsGkAtoms::rubyBaseContainerFrame &&
              annotationType == nsGkAtoms::rubyTextContainerFrame) ||
             (baseType == nsGkAtoms::rubyBaseFrame &&
              annotationType == nsGkAtoms::rubyTextFrame));
#endif

  aFrame->mNextAnnotation = baseFrame->mNextAnnotation;
  baseFrame->mNextAnnotation = aFrame;
  aFrame->mIsLinkedToBase = true;
}

int32_t
nsLineLayout::GetCurrentSpanCount() const
{
  NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");
  int32_t count = 0;
  PerFrameData* pfd = mRootSpan->mFirstFrame;
  while (nullptr != pfd) {
    count++;
    pfd = pfd->mNext;
  }
  return count;
}

void
nsLineLayout::SplitLineTo(int32_t aNewCount)
{
  NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");

#ifdef REALLY_NOISY_PUSHING
  printf("SplitLineTo %d (current count=%d); before:\n", aNewCount,
         GetCurrentSpanCount());
  DumpPerSpanData(mRootSpan, 1);
#endif
  PerSpanData* psd = mRootSpan;
  PerFrameData* pfd = psd->mFirstFrame;
  while (nullptr != pfd) {
    if (--aNewCount == 0) {
      // Truncate list at pfd (we keep pfd, but anything following is freed)
      PerFrameData* next = pfd->mNext;
      pfd->mNext = nullptr;
      psd->mLastFrame = pfd;

      // Now unlink all of the frames following pfd
      UnlinkFrame(next);
      break;
    }
    pfd = pfd->mNext;
  }
#ifdef NOISY_PUSHING
  printf("SplitLineTo %d (current count=%d); after:\n", aNewCount,
         GetCurrentSpanCount());
  DumpPerSpanData(mRootSpan, 1);
#endif
}

void
nsLineLayout::PushFrame(nsIFrame* aFrame)
{
  PerSpanData* psd = mCurrentSpan;
  NS_ASSERTION(psd->mLastFrame->mFrame == aFrame, "pushing non-last frame");

#ifdef REALLY_NOISY_PUSHING
  nsFrame::IndentBy(stdout, mSpanDepth);
  printf("PushFrame %p, before:\n", psd);
  DumpPerSpanData(psd, 1);
#endif

  // Take the last frame off of the span's frame list
  PerFrameData* pfd = psd->mLastFrame;
  if (pfd == psd->mFirstFrame) {
    // We are pushing away the only frame...empty the list
    psd->mFirstFrame = nullptr;
    psd->mLastFrame = nullptr;
  }
  else {
    PerFrameData* prevFrame = pfd->mPrev;
    prevFrame->mNext = nullptr;
    psd->mLastFrame = prevFrame;
  }

  // Now unlink the frame
  MOZ_ASSERT(!pfd->mNext);
  UnlinkFrame(pfd);
#ifdef NOISY_PUSHING
  nsFrame::IndentBy(stdout, mSpanDepth);
  printf("PushFrame: %p after:\n", psd);
  DumpPerSpanData(psd, 1);
#endif
}

void
nsLineLayout::UnlinkFrame(PerFrameData* pfd)
{
  while (nullptr != pfd) {
    PerFrameData* next = pfd->mNext;
    if (pfd->mIsLinkedToBase) {
      // This frame is linked to a ruby base, and should not be freed
      // now. Just unlink it from the span. It will be freed when its
      // base frame gets unlinked.
      pfd->mNext = pfd->mPrev = nullptr;
      pfd = next;
      continue;
    }

    // It is a ruby base frame. If there are any annotations
    // linked to this frame, free them first.
    PerFrameData* annotationPFD = pfd->mNextAnnotation;
    while (annotationPFD) {
      PerFrameData* nextAnnotation = annotationPFD->mNextAnnotation;
      MOZ_ASSERT(annotationPFD->mNext == nullptr &&
                 annotationPFD->mPrev == nullptr,
                 "PFD in annotations should have been unlinked.");
      FreeFrame(annotationPFD);
      annotationPFD = nextAnnotation;
    }

    FreeFrame(pfd);
    pfd = next;
  }
}

void
nsLineLayout::FreeFrame(PerFrameData* pfd)
{
  if (nullptr != pfd->mSpan) {
    FreeSpan(pfd->mSpan);
  }
  nsLineLayout* outerLineLayout = GetOutermostLineLayout();
  pfd->mNext = outerLineLayout->mFrameFreeList;
  outerLineLayout->mFrameFreeList = pfd;
#ifdef DEBUG
  outerLineLayout->mFramesFreed++;
#endif
}

void
nsLineLayout::FreeSpan(PerSpanData* psd)
{
  // Unlink its frames
  UnlinkFrame(psd->mFirstFrame);

  nsLineLayout* outerLineLayout = GetOutermostLineLayout();
  // Now put the span on the free list since it's free too
  psd->mNextFreeSpan = outerLineLayout->mSpanFreeList;
  outerLineLayout->mSpanFreeList = psd;
#ifdef DEBUG
  outerLineLayout->mSpansFreed++;
#endif
}

bool
nsLineLayout::IsZeroBSize()
{
  PerSpanData* psd = mCurrentSpan;
  PerFrameData* pfd = psd->mFirstFrame;
  while (nullptr != pfd) {
    if (0 != pfd->mBounds.BSize(psd->mWritingMode)) {
      return false;
    }
    pfd = pfd->mNext;
  }
  return true;
}

nsLineLayout::PerFrameData*
nsLineLayout::NewPerFrameData(nsIFrame* aFrame)
{
  nsLineLayout* outerLineLayout = GetOutermostLineLayout();
  PerFrameData* pfd = outerLineLayout->mFrameFreeList;
  if (!pfd) {
    void *mem;
    size_t sz = sizeof(PerFrameData);
    PL_ARENA_ALLOCATE(mem, &outerLineLayout->mArena, sz);
    if (!mem) {
      NS_ABORT_OOM(sz);
    }
    pfd = reinterpret_cast<PerFrameData*>(mem);
  }
  else {
    outerLineLayout->mFrameFreeList = pfd->mNext;
  }
  pfd->mSpan = nullptr;
  pfd->mNext = nullptr;
  pfd->mPrev = nullptr;
  pfd->mNextAnnotation = nullptr;
  pfd->mFrame = aFrame;

  // all flags default to false
  pfd->mRelativePos = false;
  pfd->mIsTextFrame = false;
  pfd->mIsNonEmptyTextFrame = false;
  pfd->mIsNonWhitespaceTextFrame = false;
  pfd->mIsLetterFrame = false;
  pfd->mRecomputeOverflow = false;
  pfd->mIsBullet = false;
  pfd->mSkipWhenTrimmingWhitespace = false;
  pfd->mIsEmpty = false;
  pfd->mIsLinkedToBase = false;

  pfd->mWritingMode = aFrame->GetWritingMode();
  WritingMode lineWM = mRootSpan->mWritingMode;
  pfd->mBounds = LogicalRect(lineWM);
  pfd->mOverflowAreas.Clear();
  pfd->mMargin = LogicalMargin(lineWM);
  pfd->mBorderPadding = LogicalMargin(lineWM);
  pfd->mOffsets = LogicalMargin(pfd->mWritingMode);

  pfd->mJustificationInfo = JustificationInfo();
  pfd->mJustificationAssignment = JustificationAssignment();

#ifdef DEBUG
  pfd->mBlockDirAlign = 0xFF;
  outerLineLayout->mFramesAllocated++;
#endif
  return pfd;
}

bool
nsLineLayout::LineIsBreakable() const
{
  // XXX mTotalPlacedFrames should go away and we should just use
  // mLineIsEmpty here instead
  if ((0 != mTotalPlacedFrames) || mImpactedByFloats) {
    return true;
  }
  return false;
}

// Checks all four sides for percentage units.  This means it should
// only be used for things (margin, padding) where percentages on top
// and bottom depend on the *width* just like percentages on left and
// right.
static bool
HasPercentageUnitSide(const nsStyleSides& aSides)
{
  NS_FOR_CSS_SIDES(side) {
    if (aSides.Get(side).HasPercent())
      return true;
  }
  return false;
}

static bool
IsPercentageAware(const nsIFrame* aFrame)
{
  NS_ASSERTION(aFrame, "null frame is not allowed");

  nsIAtom *fType = aFrame->GetType();
  if (fType == nsGkAtoms::textFrame) {
    // None of these things can ever be true for text frames.
    return false;
  }

  // Some of these things don't apply to non-replaced inline frames
  // (that is, fType == nsGkAtoms::inlineFrame), but we won't bother making
  // things unnecessarily complicated, since they'll probably be set
  // quite rarely.

  const nsStyleMargin* margin = aFrame->StyleMargin();
  if (HasPercentageUnitSide(margin->mMargin)) {
    return true;
  }

  const nsStylePadding* padding = aFrame->StylePadding();
  if (HasPercentageUnitSide(padding->mPadding)) {
    return true;
  }

  // Note that borders can't be aware of percentages

  const nsStylePosition* pos = aFrame->StylePosition();

  if ((pos->WidthDependsOnContainer() &&
       pos->mWidth.GetUnit() != eStyleUnit_Auto) ||
      pos->MaxWidthDependsOnContainer() ||
      pos->MinWidthDependsOnContainer() ||
      pos->OffsetHasPercent(NS_SIDE_RIGHT) ||
      pos->OffsetHasPercent(NS_SIDE_LEFT)) {
    return true;
  }

  if (eStyleUnit_Auto == pos->mWidth.GetUnit()) {
    // We need to check for frames that shrink-wrap when they're auto
    // width.
    const nsStyleDisplay* disp = aFrame->StyleDisplay();
    if (disp->mDisplay == StyleDisplay::InlineBlock ||
        disp->mDisplay == StyleDisplay::InlineTable ||
        fType == nsGkAtoms::HTMLButtonControlFrame ||
        fType == nsGkAtoms::gfxButtonControlFrame ||
        fType == nsGkAtoms::fieldSetFrame ||
        fType == nsGkAtoms::comboboxDisplayFrame) {
      return true;
    }

    // Per CSS 2.1, section 10.3.2:
    //   If 'height' and 'width' both have computed values of 'auto' and
    //   the element has an intrinsic ratio but no intrinsic height or
    //   width and the containing block's width does not itself depend
    //   on the replaced element's width, then the used value of 'width'
    //   is calculated from the constraint equation used for
    //   block-level, non-replaced elements in normal flow. 
    nsIFrame *f = const_cast<nsIFrame*>(aFrame);
    if (f->GetIntrinsicRatio() != nsSize(0, 0) &&
        // Some percents are treated like 'auto', so check != coord
        pos->mHeight.GetUnit() != eStyleUnit_Coord) {
      const IntrinsicSize &intrinsicSize = f->GetIntrinsicSize();
      if (intrinsicSize.width.GetUnit() == eStyleUnit_None &&
          intrinsicSize.height.GetUnit() == eStyleUnit_None) {
        return true;
      }
    }
  }

  return false;
}

void
nsLineLayout::ReflowFrame(nsIFrame* aFrame,
                          nsReflowStatus& aReflowStatus,
                          ReflowOutput* aMetrics,
                          bool& aPushedFrame)
{
  // Initialize OUT parameter
  aPushedFrame = false;

  PerFrameData* pfd = NewPerFrameData(aFrame);
  PerSpanData* psd = mCurrentSpan;
  psd->AppendFrame(pfd);

#ifdef REALLY_NOISY_REFLOW
  nsFrame::IndentBy(stdout, mSpanDepth);
  printf("%p: Begin ReflowFrame pfd=%p ", psd, pfd);
  nsFrame::ListTag(stdout, aFrame);
  printf("\n");
#endif

  if (mCurrentSpan == mRootSpan) {
    pfd->mFrame->Properties().Remove(nsIFrame::LineBaselineOffset());
  } else {
#ifdef DEBUG
    bool hasLineOffset;
    pfd->mFrame->Properties().Get(nsIFrame::LineBaselineOffset(), &hasLineOffset);
    NS_ASSERTION(!hasLineOffset, "LineBaselineOffset was set but was not expected");
#endif
  }

  mJustificationInfo = JustificationInfo();

  // Stash copies of some of the computed state away for later
  // (block-direction alignment, for example)
  WritingMode frameWM = pfd->mWritingMode;
  WritingMode lineWM = mRootSpan->mWritingMode;

  // NOTE: While the inline direction coordinate remains relative to the
  // parent span, the block direction coordinate is fixed at the top
  // edge for the line. During VerticalAlignFrames we will repair this
  // so that the block direction coordinate is properly set and relative
  // to the appropriate span.
  pfd->mBounds.IStart(lineWM) = psd->mICoord;
  pfd->mBounds.BStart(lineWM) = mBStartEdge;

  // We want to guarantee that we always make progress when
  // formatting. Therefore, if the object being placed on the line is
  // too big for the line, but it is the only thing on the line and is not
  // impacted by a float, then we go ahead and place it anyway. (If the line
  // is impacted by one or more floats, then it is safe to break because
  // we can move the line down below float(s).)
  //
  // Capture this state *before* we reflow the frame in case it clears
  // the state out. We need to know how to treat the current frame
  // when breaking.
  bool notSafeToBreak = LineIsEmpty() && !mImpactedByFloats;

  // Figure out whether we're talking about a textframe here
  nsIAtom* frameType = aFrame->GetType();
  bool isText = frameType == nsGkAtoms::textFrame;
  
  // Inline-ish and text-ish things don't compute their width;
  // everything else does.  We need to give them an available width that
  // reflects the space left on the line.
  LAYOUT_WARN_IF_FALSE(psd->mIEnd != NS_UNCONSTRAINEDSIZE,
                      "have unconstrained width; this should only result from "
                      "very large sizes, not attempts at intrinsic width "
                      "calculation");
  nscoord availableSpaceOnLine = psd->mIEnd - psd->mICoord;

  // Setup reflow state for reflowing the frame
  Maybe<ReflowInput> reflowInputHolder;
  if (!isText) {
    // Compute the available size for the frame. This available width
    // includes room for the side margins.
    // For now, set the available block-size to unconstrained always.
    LogicalSize availSize = mBlockReflowInput->ComputedSize(frameWM);
    availSize.BSize(frameWM) = NS_UNCONSTRAINEDSIZE;
    reflowInputHolder.emplace(mPresContext, *psd->mReflowInput,
                              aFrame, availSize);
    ReflowInput& reflowInput = *reflowInputHolder;
    reflowInput.mLineLayout = this;
    reflowInput.mFlags.mIsTopOfPage = mIsTopOfPage;
    if (reflowInput.ComputedISize() == NS_UNCONSTRAINEDSIZE) {
      reflowInput.AvailableISize() = availableSpaceOnLine;
    }
    WritingMode stateWM = reflowInput.GetWritingMode();
    pfd->mMargin =
      reflowInput.ComputedLogicalMargin().ConvertTo(lineWM, stateWM);
    pfd->mBorderPadding =
      reflowInput.ComputedLogicalBorderPadding().ConvertTo(lineWM, stateWM);
    pfd->mRelativePos =
      reflowInput.mStyleDisplay->IsRelativelyPositionedStyle();
    if (pfd->mRelativePos) {
      pfd->mOffsets =
        reflowInput.ComputedLogicalOffsets().ConvertTo(frameWM, stateWM);
    }

    // Calculate whether the the frame should have a start margin and
    // subtract the margin from the available width if necessary.
    // The margin will be applied to the starting inline coordinates of
    // the frame in CanPlaceFrame() after reflowing the frame.
    AllowForStartMargin(pfd, reflowInput);
  }
  // if isText(), no need to propagate NS_FRAME_IS_DIRTY from the parent,
  // because reflow doesn't look at the dirty bits on the frame being reflowed.

  // See if this frame depends on the width of its containing block.  If
  // so, disable resize reflow optimizations for the line.  (Note that,
  // to be conservative, we do this if we *try* to fit a frame on a
  // line, even if we don't succeed.)  (Note also that we can only make
  // this IsPercentageAware check *after* we've constructed our
  // ReflowInput, because that construction may be what forces aFrame
  // to lazily initialize its (possibly-percent-valued) intrinsic size.)
  if (mGotLineBox && IsPercentageAware(aFrame)) {
    mLineBox->DisableResizeReflowOptimization();
  }

  // Note that we don't bother positioning the frame yet, because we're probably
  // going to end up moving it when we do the block-direction alignment.

  // Adjust spacemanager coordinate system for the frame.
  ReflowOutput reflowOutput(lineWM);
#ifdef DEBUG
  reflowOutput.ISize(lineWM) = nscoord(0xdeadbeef);
  reflowOutput.BSize(lineWM) = nscoord(0xdeadbeef);
#endif
  nscoord tI = pfd->mBounds.LineLeft(lineWM, ContainerSize());
  nscoord tB = pfd->mBounds.BStart(lineWM);
  mFloatManager->Translate(tI, tB);

  int32_t savedOptionalBreakOffset;
  gfxBreakPriority savedOptionalBreakPriority;
  nsIFrame* savedOptionalBreakFrame =
    GetLastOptionalBreakPosition(&savedOptionalBreakOffset,
                                 &savedOptionalBreakPriority);

  if (!isText) {
    aFrame->Reflow(mPresContext, reflowOutput, *reflowInputHolder, aReflowStatus);
  } else {
    static_cast<nsTextFrame*>(aFrame)->
      ReflowText(*this, availableSpaceOnLine,
                 psd->mReflowInput->mRenderingContext->GetDrawTarget(),
                 reflowOutput, aReflowStatus);
  }

  pfd->mJustificationInfo = mJustificationInfo;
  mJustificationInfo = JustificationInfo();

  // See if the frame is a placeholderFrame and if it is process
  // the float. At the same time, check if the frame has any non-collapsed-away
  // content.
  bool placedFloat = false;
  bool isEmpty;
  if (!frameType) {
    isEmpty = pfd->mFrame->IsEmpty();
  } else {
    if (nsGkAtoms::placeholderFrame == frameType) {
      isEmpty = true;
      pfd->mSkipWhenTrimmingWhitespace = true;
      nsIFrame* outOfFlowFrame = nsLayoutUtils::GetFloatFromPlaceholder(aFrame);
      if (outOfFlowFrame) {
        // Add mTrimmableISize to the available width since if the line ends
        // here, the width of the inline content will be reduced by
        // mTrimmableISize.
        nscoord availableISize = psd->mIEnd - (psd->mICoord - mTrimmableISize);
        if (psd->mNoWrap) {
          // If we place floats after inline content where there's
          // no break opportunity, we don't know how much additional
          // width is required for the non-breaking content after the float,
          // so we can't know whether the float plus that content will fit
          // on the line. So for now, don't place floats after inline
          // content where there's no break opportunity. This is incorrect
          // but hopefully rare. Fixing it will require significant
          // restructuring of line layout.
          // We might as well allow zero-width floats to be placed, though.
          availableISize = 0;
        }
        placedFloat = GetOutermostLineLayout()->
          AddFloat(outOfFlowFrame, availableISize);
        NS_ASSERTION(!(outOfFlowFrame->GetType() == nsGkAtoms::letterFrame &&
                       GetFirstLetterStyleOK()),
                    "FirstLetterStyle set on line with floating first letter");
      }
    }
    else if (isText) {
      // Note non-empty text-frames for inline frame compatibility hackery
      pfd->mIsTextFrame = true;
      nsTextFrame* textFrame = static_cast<nsTextFrame*>(pfd->mFrame);
      isEmpty = !textFrame->HasNoncollapsedCharacters();
      if (!isEmpty) {
        pfd->mIsNonEmptyTextFrame = true;
        nsIContent* content = textFrame->GetContent();

        const nsTextFragment* frag = content->GetText();
        if (frag) {
          pfd->mIsNonWhitespaceTextFrame = !content->TextIsOnlyWhitespace();
        }
      }
    }
    else if (nsGkAtoms::brFrame == frameType) {
      pfd->mSkipWhenTrimmingWhitespace = true;
      isEmpty = false;
    } else {
      if (nsGkAtoms::letterFrame==frameType) {
        pfd->mIsLetterFrame = true;
      }
      if (pfd->mSpan) {
        isEmpty = !pfd->mSpan->mHasNonemptyContent && pfd->mFrame->IsSelfEmpty();
      } else {
        isEmpty = pfd->mFrame->IsEmpty();
      }
    }
  }
  pfd->mIsEmpty = isEmpty;

  mFloatManager->Translate(-tI, -tB);

  NS_ASSERTION(reflowOutput.ISize(lineWM) >= 0, "bad inline size");
  NS_ASSERTION(reflowOutput.BSize(lineWM) >= 0,"bad block size");
  if (reflowOutput.ISize(lineWM) < 0) {
    reflowOutput.ISize(lineWM) = 0;
  }
  if (reflowOutput.BSize(lineWM) < 0) {
    reflowOutput.BSize(lineWM) = 0;
  }

#ifdef DEBUG
  // Note: break-before means ignore the reflow metrics since the
  // frame will be reflowed another time.
  if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) {
    if ((CRAZY_SIZE(reflowOutput.ISize(lineWM)) ||
         CRAZY_SIZE(reflowOutput.BSize(lineWM))) &&
        !LineContainerFrame()->GetParent()->IsCrazySizeAssertSuppressed()) {
      printf("nsLineLayout: ");
      nsFrame::ListTag(stdout, aFrame);
      printf(" metrics=%d,%d!\n", reflowOutput.Width(), reflowOutput.Height());
    }
    if ((reflowOutput.Width() == nscoord(0xdeadbeef)) ||
        (reflowOutput.Height() == nscoord(0xdeadbeef))) {
      printf("nsLineLayout: ");
      nsFrame::ListTag(stdout, aFrame);
      printf(" didn't set w/h %d,%d!\n", reflowOutput.Width(), reflowOutput.Height());
    }
  }
#endif

  // Unlike with non-inline reflow, the overflow area here does *not*
  // include the accumulation of the frame's bounds and its inline
  // descendants' bounds. Nor does it include the outline area; it's
  // just the union of the bounds of any absolute children. That is
  // added in later by nsLineLayout::ReflowInlineFrames.
  pfd->mOverflowAreas = reflowOutput.mOverflowAreas;

  pfd->mBounds.ISize(lineWM) = reflowOutput.ISize(lineWM);
  pfd->mBounds.BSize(lineWM) = reflowOutput.BSize(lineWM);

  // Size the frame, but |RelativePositionFrames| will size the view.
  aFrame->SetRect(lineWM, pfd->mBounds, ContainerSizeForSpan(psd));

  // Tell the frame that we're done reflowing it
  aFrame->DidReflow(mPresContext,
                    isText ? nullptr : reflowInputHolder.ptr(),
                    nsDidReflowStatus::FINISHED);

  if (aMetrics) {
    *aMetrics = reflowOutput;
  }

  if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) {
    // If frame is complete and has a next-in-flow, we need to delete
    // them now. Do not do this when a break-before is signaled because
    // the frame is going to get reflowed again (and may end up wanting
    // a next-in-flow where it ends up).
    if (NS_FRAME_IS_COMPLETE(aReflowStatus)) {
      nsIFrame* kidNextInFlow = aFrame->GetNextInFlow();
      if (nullptr != kidNextInFlow) {
        // Remove all of the childs next-in-flows. Make sure that we ask
        // the right parent to do the removal (it's possible that the
        // parent is not this because we are executing pullup code)
        kidNextInFlow->GetParent()->
          DeleteNextInFlowChild(kidNextInFlow, true);
      }
    }

    // Check whether this frame breaks up text runs. All frames break up text
    // runs (hence return false here) except for text frames and inline containers.
    bool continuingTextRun = aFrame->CanContinueTextRun();
    
    // Clear any residual mTrimmableISize if this isn't a text frame
    if (!continuingTextRun && !pfd->mSkipWhenTrimmingWhitespace) {
      mTrimmableISize = 0;
    }

    // See if we can place the frame. If we can't fit it, then we
    // return now.
    bool optionalBreakAfterFits;
    NS_ASSERTION(isText ||
                 !reflowInputHolder->IsFloating(),
                 "How'd we get a floated inline frame? "
                 "The frame ctor should've dealt with this.");
    if (CanPlaceFrame(pfd, notSafeToBreak, continuingTextRun,
                      savedOptionalBreakFrame != nullptr, reflowOutput,
                      aReflowStatus, &optionalBreakAfterFits)) {
      if (!isEmpty) {
        psd->mHasNonemptyContent = true;
        mLineIsEmpty = false;
        if (!pfd->mSpan) {
          // nonempty leaf content has been placed
          mLineAtStart = false;
        }
        if (nsGkAtoms::rubyFrame == frameType) {
          mHasRuby = true;
          SyncAnnotationBounds(pfd);
        }
      }

      // Place the frame, updating aBounds with the final size and
      // location.  Then apply the bottom+right margins (as
      // appropriate) to the frame.
      PlaceFrame(pfd, reflowOutput);
      PerSpanData* span = pfd->mSpan;
      if (span) {
        // The frame we just finished reflowing is an inline
        // container.  It needs its child frames aligned in the block direction,
        // so do most of it now.
        VerticalAlignFrames(span);
      }
      
      if (!continuingTextRun) {
        if (!psd->mNoWrap && (!LineIsEmpty() || placedFloat)) {
          // record soft break opportunity after this content that can't be
          // part of a text run. This is not a text frame so we know
          // that offset INT32_MAX means "after the content".
          if (NotifyOptionalBreakPosition(aFrame, INT32_MAX,
                                          optionalBreakAfterFits,
                                          gfxBreakPriority::eNormalBreak)) {
            // If this returns true then we are being told to actually break here.
            aReflowStatus = NS_INLINE_LINE_BREAK_AFTER(aReflowStatus);
          }
        }
      }
    }
    else {
      PushFrame(aFrame);
      aPushedFrame = true;
      // Undo any saved break positions that the frame might have told us about,
      // since we didn't end up placing it
      RestoreSavedBreakPosition(savedOptionalBreakFrame,
                                savedOptionalBreakOffset,
                                savedOptionalBreakPriority);
    }
  }
  else {
    PushFrame(aFrame);
    aPushedFrame = true;
  }
  
#ifdef REALLY_NOISY_REFLOW
  nsFrame::IndentBy(stdout, mSpanDepth);
  printf("End ReflowFrame ");
  nsFrame::ListTag(stdout, aFrame);
  printf(" status=%x\n", aReflowStatus);
#endif
}

void
nsLineLayout::AllowForStartMargin(PerFrameData* pfd,
                                  ReflowInput& aReflowInput)
{
  NS_ASSERTION(!aReflowInput.IsFloating(),
               "How'd we get a floated inline frame? "
               "The frame ctor should've dealt with this.");

  WritingMode lineWM = mRootSpan->mWritingMode;

  // Only apply start-margin on the first-in flow for inline frames,
  // and make sure to not apply it to any inline other than the first
  // in an ib split.  Note that the ib sibling (block-in-inline
  // sibling) annotations only live on the first continuation, but we
  // don't want to apply the start margin for later continuations
  // anyway.  For box-decoration-break:clone we apply the start-margin
  // on all continuations.
  if ((pfd->mFrame->GetPrevContinuation() ||
       pfd->mFrame->FrameIsNonFirstInIBSplit()) &&
      aReflowInput.mStyleBorder->mBoxDecorationBreak ==
        StyleBoxDecorationBreak::Slice) {
    // Zero this out so that when we compute the max-element-width of
    // the frame we will properly avoid adding in the starting margin.
    pfd->mMargin.IStart(lineWM) = 0;
  } else if (NS_UNCONSTRAINEDSIZE == aReflowInput.ComputedISize()) {
    NS_WARNING_ASSERTION(
      NS_UNCONSTRAINEDSIZE != aReflowInput.AvailableISize(),
      "have unconstrained inline-size; this should only result from very "
      "large sizes, not attempts at intrinsic inline-size calculation");
    // For inline-ish and text-ish things (which don't compute widths
    // in the reflow state), adjust available inline-size to account
    // for the start margin. The end margin will be accounted for when
    // we finish flowing the frame.
    WritingMode wm = aReflowInput.GetWritingMode();
    aReflowInput.AvailableISize() -=
        pfd->mMargin.ConvertTo(wm, lineWM).IStart(wm);
  }
}

nscoord
nsLineLayout::GetCurrentFrameInlineDistanceFromBlock()
{
  PerSpanData* psd;
  nscoord x = 0;
  for (psd = mCurrentSpan; psd; psd = psd->mParent) {
    x += psd->mICoord;
  }
  return x;
}

/**
 * This method syncs bounds of ruby annotations and ruby annotation
 * containers from their rect. It is necessary because:
 * Containers are not part of the line in their levels, which means
 * their bounds are not set properly before.
 * Ruby annotations' position may have been changed when reflowing
 * their containers.
 */
void
nsLineLayout::SyncAnnotationBounds(PerFrameData* aRubyFrame)
{
  MOZ_ASSERT(aRubyFrame->mFrame->GetType() == nsGkAtoms::rubyFrame);
  MOZ_ASSERT(aRubyFrame->mSpan);

  PerSpanData* span = aRubyFrame->mSpan;
  WritingMode lineWM = mRootSpan->mWritingMode;
  for (PerFrameData* pfd = span->mFirstFrame; pfd; pfd = pfd->mNext) {
    for (PerFrameData* rtc = pfd->mNextAnnotation;
         rtc; rtc = rtc->mNextAnnotation) {
      // When the annotation container is reflowed, the width of the
      // ruby container is unknown so we use a dummy container size;
      // in the case of RTL block direction, the final position will be
      // fixed up later.
      const nsSize dummyContainerSize;
      LogicalRect rtcBounds(lineWM, rtc->mFrame->GetRect(),
                            dummyContainerSize);
      rtc->mBounds = rtcBounds;
      nsSize rtcSize = rtcBounds.Size(lineWM).GetPhysicalSize(lineWM);
      for (PerFrameData* rt = rtc->mSpan->mFirstFrame; rt; rt = rt->mNext) {
        LogicalRect rtBounds = rt->mFrame->GetLogicalRect(lineWM, rtcSize);
        MOZ_ASSERT(rt->mBounds.Size(lineWM) == rtBounds.Size(lineWM),
                   "Size of the annotation should not have been changed");
        rt->mBounds.SetOrigin(lineWM, rtBounds.Origin(lineWM));
      }
    }
  }
}

/**
 * See if the frame can be placed now that we know it's desired size.
 * We can always place the frame if the line is empty. Note that we
 * know that the reflow-status is not a break-before because if it was
 * ReflowFrame above would have returned false, preventing this method
 * from being called. The logic in this method assumes that.
 *
 * Note that there is no check against the Y coordinate because we
 * assume that the caller will take care of that.
 */
bool
nsLineLayout::CanPlaceFrame(PerFrameData* pfd,
                            bool aNotSafeToBreak,
                            bool aFrameCanContinueTextRun,
                            bool aCanRollBackBeforeFrame,
                            ReflowOutput& aMetrics,
                            nsReflowStatus& aStatus,
                            bool* aOptionalBreakAfterFits)
{
  NS_PRECONDITION(pfd && pfd->mFrame, "bad args, null pointers for frame data");

  *aOptionalBreakAfterFits = true;

  WritingMode lineWM = mRootSpan->mWritingMode;
  /*
   * We want to only apply the end margin if we're the last continuation and
   * either not in an {ib} split or the last inline in it.  In all other
   * cases we want to zero it out.  That means zeroing it out if any of these
   * conditions hold:
   * 1) The frame is not complete (in this case it will get a next-in-flow)
   * 2) The frame is complete but has a non-fluid continuation on its
   *    continuation chain.  Note that if it has a fluid continuation, that
   *    continuation will get destroyed later, so we don't want to drop the
   *    end-margin in that case.
   * 3) The frame is in an {ib} split and is not the last part.
   *
   * However, none of that applies if this is a letter frame (XXXbz why?)
   *
   * For box-decoration-break:clone we apply the end margin on all
   * continuations (that are not letter frames).
   */
  if ((NS_FRAME_IS_NOT_COMPLETE(aStatus) ||
       pfd->mFrame->LastInFlow()->GetNextContinuation() ||
       pfd->mFrame->FrameIsNonLastInIBSplit()) &&
      !pfd->mIsLetterFrame &&
      pfd->mFrame->StyleBorder()->mBoxDecorationBreak ==
        StyleBoxDecorationBreak::Slice) {
    pfd->mMargin.IEnd(lineWM) = 0;
  }

  // Apply the start margin to the frame bounds.
  nscoord startMargin = pfd->mMargin.IStart(lineWM);
  nscoord endMargin = pfd->mMargin.IEnd(lineWM);

  pfd->mBounds.IStart(lineWM) += startMargin;

  PerSpanData* psd = mCurrentSpan;
  if (psd->mNoWrap) {
    // When wrapping is off, everything fits.
    return true;
  }

#ifdef NOISY_CAN_PLACE_FRAME
  if (nullptr != psd->mFrame) {
    nsFrame::ListTag(stdout, psd->mFrame->mFrame);
  }
  printf(": aNotSafeToBreak=%s frame=", aNotSafeToBreak ? "true" : "false");
  nsFrame::ListTag(stdout, pfd->mFrame);
  printf(" frameWidth=%d, margins=%d,%d\n",
         pfd->mBounds.IEnd(lineWM) + endMargin - psd->mICoord,
         startMargin, endMargin);
#endif

  // Set outside to true if the result of the reflow leads to the
  // frame sticking outside of our available area.
  bool outside = pfd->mBounds.IEnd(lineWM) - mTrimmableISize + endMargin >
                 psd->mIEnd;
  if (!outside) {
    // If it fits, it fits
#ifdef NOISY_CAN_PLACE_FRAME
    printf("   ==> inside\n");
#endif
    return true;
  }
  *aOptionalBreakAfterFits = false;

  // When it doesn't fit, check for a few special conditions where we
  // allow it to fit anyway.
  if (0 == startMargin + pfd->mBounds.ISize(lineWM) + endMargin) {
    // Empty frames always fit right where they are
#ifdef NOISY_CAN_PLACE_FRAME
    printf("   ==> empty frame fits\n");
#endif
    return true;
  }

#ifdef FIX_BUG_50257
  // another special case:  always place a BR
  if (nsGkAtoms::brFrame == pfd->mFrame->GetType()) {
#ifdef NOISY_CAN_PLACE_FRAME
    printf("   ==> BR frame fits\n");
#endif
    return true;
  }
#endif

  if (aNotSafeToBreak) {
    // There are no frames on the line that take up width and the line is
    // not impacted by floats, so we must allow the current frame to be
    // placed on the line
#ifdef NOISY_CAN_PLACE_FRAME
    printf("   ==> not-safe and not-impacted fits: ");
    while (nullptr != psd) {
      printf("<psd=%p x=%d left=%d> ", psd, psd->mICoord, psd->mIStart);
      psd = psd->mParent;
    }
    printf("\n");
#endif
    return true;
  }
 
  // Special check for span frames
  if (pfd->mSpan && pfd->mSpan->mContainsFloat) {
    // If the span either directly or indirectly contains a float then
    // it fits. Why? It's kind of complicated, but here goes:
    //
    // 1. CanPlaceFrame is used for all frame placements on a line,
    // and in a span. This includes recursively placement of frames
    // inside of spans, and the span itself. Because the logic always
    // checks for room before proceeding (the code above here), the
    // only things on a line will be those things that "fit".
    //
    // 2. Before a float is placed on a line, the line has to be empty
    // (otherwise it's a "below current line" float and will be placed
    // after the line).
    //
    // Therefore, if the span directly or indirectly has a float
    // then it means that at the time of the placement of the float
    // the line was empty. Because of #1, only the frames that fit can
    // be added after that point, therefore we can assume that the
    // current span being placed has fit.
    //
    // So how do we get here and have a span that should already fit
    // and yet doesn't: Simple: span's that have the no-wrap attribute
    // set on them and contain a float and are placed where they
    // don't naturally fit.
    return true;
 }

  if (aFrameCanContinueTextRun) {
    // Let it fit, but we reserve the right to roll back.
    // Note that we usually won't get here because a text frame will break
    // itself to avoid exceeding the available width.
    // We'll only get here for text frames that couldn't break early enough.
#ifdef NOISY_CAN_PLACE_FRAME
    printf("   ==> placing overflowing textrun, requesting backup\n");
#endif

    // We will want to try backup.
    mNeedBackup = true;
    return true;
  }

#ifdef NOISY_CAN_PLACE_FRAME
  printf("   ==> didn't fit\n");
#endif
  aStatus = NS_INLINE_LINE_BREAK_BEFORE();
  return false;
}

/**
 * Place the frame. Update running counters.
 */
void
nsLineLayout::PlaceFrame(PerFrameData* pfd, ReflowOutput& aMetrics)
{
  WritingMode lineWM = mRootSpan->mWritingMode;

  // If the frame's block direction does not match the line's, we can't use
  // its ascent; instead, treat it as a block with baseline at the block-end
  // edge (or block-begin in the case of an "inverted" line).
  if (pfd->mWritingMode.GetBlockDir() != lineWM.GetBlockDir()) {
    pfd->mAscent = lineWM.IsLineInverted() ? 0 : aMetrics.BSize(lineWM);
  } else {
    if (aMetrics.BlockStartAscent() == ReflowOutput::ASK_FOR_BASELINE) {
      pfd->mAscent = pfd->mFrame->GetLogicalBaseline(lineWM);
    } else {
      pfd->mAscent = aMetrics.BlockStartAscent();
    }
  }

  // Advance to next inline coordinate
  mCurrentSpan->mICoord = pfd->mBounds.IEnd(lineWM) +
                          pfd->mMargin.IEnd(lineWM);

  // Count the number of non-placeholder frames on the line...
  if (pfd->mFrame->GetType() == nsGkAtoms::placeholderFrame) {
    NS_ASSERTION(pfd->mBounds.ISize(lineWM) == 0 &&
                 pfd->mBounds.BSize(lineWM) == 0,
                 "placeholders should have 0 width/height (checking "
                 "placeholders were never counted by the old code in "
                 "this function)");
  } else {
    mTotalPlacedFrames++;
  }
}

void
nsLineLayout::AddBulletFrame(nsIFrame* aFrame,
                             const ReflowOutput& aMetrics)
{
  NS_ASSERTION(mCurrentSpan == mRootSpan, "bad linelayout user");
  NS_ASSERTION(mGotLineBox, "must have line box");

  nsIFrame *blockFrame = mBlockReflowInput->mFrame;
  NS_ASSERTION(blockFrame->IsFrameOfType(nsIFrame::eBlockFrame),
               "must be for block");
  if (!static_cast<nsBlockFrame*>(blockFrame)->BulletIsEmpty()) {
    mHasBullet = true;
    mLineBox->SetHasBullet();
  }

  WritingMode lineWM = mRootSpan->mWritingMode;
  PerFrameData* pfd = NewPerFrameData(aFrame);
  mRootSpan->AppendFrame(pfd);
  pfd->mIsBullet = true;
  if (aMetrics.BlockStartAscent() == ReflowOutput::ASK_FOR_BASELINE) {
    pfd->mAscent = aFrame->GetLogicalBaseline(lineWM);
  } else {
    pfd->mAscent = aMetrics.BlockStartAscent();
  }

  // Note: block-coord value will be updated during block-direction alignment
  pfd->mBounds = LogicalRect(lineWM, aFrame->GetRect(), ContainerSize());
  pfd->mOverflowAreas = aMetrics.mOverflowAreas;
}

#ifdef DEBUG
void
nsLineLayout::DumpPerSpanData(PerSpanData* psd, int32_t aIndent)
{
  nsFrame::IndentBy(stdout, aIndent);
  printf("%p: left=%d x=%d right=%d\n", static_cast<void*>(psd),
         psd->mIStart, psd->mICoord, psd->mIEnd);
  PerFrameData* pfd = psd->mFirstFrame;
  while (nullptr != pfd) {
    nsFrame::IndentBy(stdout, aIndent+1);
    nsFrame::ListTag(stdout, pfd->mFrame);
    nsRect rect = pfd->mBounds.GetPhysicalRect(psd->mWritingMode,
                                               ContainerSize());
    printf(" %d,%d,%d,%d\n", rect.x, rect.y, rect.width, rect.height);
    if (pfd->mSpan) {
      DumpPerSpanData(pfd->mSpan, aIndent + 1);
    }
    pfd = pfd->mNext;
  }
}
#endif

#define VALIGN_OTHER  0
#define VALIGN_TOP    1
#define VALIGN_BOTTOM 2

void
nsLineLayout::VerticalAlignLine()
{
  // Partially place the children of the block frame. The baseline for
  // this operation is set to zero so that the y coordinates for all
  // of the placed children will be relative to there.
  PerSpanData* psd = mRootSpan;
  VerticalAlignFrames(psd);

  // *** Note that comments here still use the anachronistic term
  // "line-height" when we really mean "size of the line in the block
  // direction", "vertical-align" when we really mean "alignment in
  // the block direction", and "top" and "bottom" when we really mean
  // "block start" and "block end". This is partly for brevity and
  // partly to retain the association with the CSS line-height and
  // vertical-align properties.
  //
  // Compute the line-height. The line-height will be the larger of:
  //
  // [1] maxBCoord - minBCoord (the distance between the first child's
  // block-start edge and the last child's block-end edge)
  //
  // [2] the maximum logical box block size (since not every frame may have
  // participated in #1; for example: "top" and "botttom" aligned frames)
  //
  // [3] the minimum line height ("line-height" property set on the
  // block frame)
  nscoord lineBSize = psd->mMaxBCoord - psd->mMinBCoord;

  // Now that the line-height is computed, we need to know where the
  // baseline is in the line. Position baseline so that mMinBCoord is just
  // inside the start of the line box.
  nscoord baselineBCoord;
  if (psd->mMinBCoord < 0) {
    baselineBCoord = mBStartEdge - psd->mMinBCoord;
  }
  else {
    baselineBCoord = mBStartEdge;
  }

  // It's also possible that the line block-size isn't tall enough because
  // of "top" and "bottom" aligned elements that were not accounted for in
  // min/max BCoord.
  //
  // The CSS2 spec doesn't really say what happens when to the
  // baseline in this situations. What we do is if the largest start
  // aligned box block size is greater than the line block-size then we leave
  // the baseline alone. If the largest end aligned box is greater
  // than the line block-size then we slide the baseline forward by the extra
  // amount.
  //
  // Navigator 4 gives precedence to the first top/bottom aligned
  // object.  We just let block end aligned objects win.
  if (lineBSize < mMaxEndBoxBSize) {
    // When the line is shorter than the maximum block start aligned box
    nscoord extra = mMaxEndBoxBSize - lineBSize;
    baselineBCoord += extra;
    lineBSize = mMaxEndBoxBSize;
  }
  if (lineBSize < mMaxStartBoxBSize) {
    lineBSize = mMaxStartBoxBSize;
  }
#ifdef NOISY_BLOCKDIR_ALIGN
  printf("  [line]==> lineBSize=%d baselineBCoord=%d\n", lineBSize, baselineBCoord);
#endif

  // Now position all of the frames in the root span. We will also
  // recurse over the child spans and place any frames we find with
  // vertical-align: top or bottom.
  // XXX PERFORMANCE: set a bit per-span to avoid the extra work
  // (propagate it upward too)
  WritingMode lineWM = psd->mWritingMode;
  for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
    if (pfd->mBlockDirAlign == VALIGN_OTHER) {
      pfd->mBounds.BStart(lineWM) += baselineBCoord;
      pfd->mFrame->SetRect(lineWM, pfd->mBounds, ContainerSize());
    }
  }
  PlaceTopBottomFrames(psd, -mBStartEdge, lineBSize);

  mFinalLineBSize = lineBSize;
  if (mGotLineBox) {
    // Fill in returned line-box and max-element-width data
    mLineBox->SetBounds(lineWM,
                        psd->mIStart, mBStartEdge,
                        psd->mICoord - psd->mIStart, lineBSize,
                        ContainerSize());

    mLineBox->SetLogicalAscent(baselineBCoord - mBStartEdge);
#ifdef NOISY_BLOCKDIR_ALIGN
    printf(
      "  [line]==> bounds{x,y,w,h}={%d,%d,%d,%d} lh=%d a=%d\n",
      mLineBox->GetBounds().IStart(lineWM), mLineBox->GetBounds().BStart(lineWM),
      mLineBox->GetBounds().ISize(lineWM), mLineBox->GetBounds().BSize(lineWM),
      mFinalLineBSize, mLineBox->GetLogicalAscent());
#endif
  }
}

// Place frames with CSS property vertical-align: top or bottom.
void
nsLineLayout::PlaceTopBottomFrames(PerSpanData* psd,
                                   nscoord aDistanceFromStart,
                                   nscoord aLineBSize)
{
  for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
    PerSpanData* span = pfd->mSpan;
#ifdef DEBUG
    NS_ASSERTION(0xFF != pfd->mBlockDirAlign, "umr");
#endif
    WritingMode lineWM = mRootSpan->mWritingMode;
    nsSize containerSize = ContainerSizeForSpan(psd);
    switch (pfd->mBlockDirAlign) {
      case VALIGN_TOP:
        if (span) {
          pfd->mBounds.BStart(lineWM) = -aDistanceFromStart - span->mMinBCoord;
        }
        else {
          pfd->mBounds.BStart(lineWM) =
            -aDistanceFromStart + pfd->mMargin.BStart(lineWM);
        }
        pfd->mFrame->SetRect(lineWM, pfd->mBounds, containerSize);
#ifdef NOISY_BLOCKDIR_ALIGN
        printf("    ");
        nsFrame::ListTag(stdout, pfd->mFrame);
        printf(": y=%d dTop=%d [bp.top=%d topLeading=%d]\n",
               pfd->mBounds.BStart(lineWM), aDistanceFromStart,
               span ? pfd->mBorderPadding.BStart(lineWM) : 0,
               span ? span->mBStartLeading : 0);
#endif
        break;
      case VALIGN_BOTTOM:
        if (span) {
          // Compute bottom leading
          pfd->mBounds.BStart(lineWM) =
            -aDistanceFromStart + aLineBSize - span->mMaxBCoord;
        }
        else {
          pfd->mBounds.BStart(lineWM) = -aDistanceFromStart + aLineBSize -
            pfd->mMargin.BEnd(lineWM) - pfd->mBounds.BSize(lineWM);
        }
        pfd->mFrame->SetRect(lineWM, pfd->mBounds, containerSize);
#ifdef NOISY_BLOCKDIR_ALIGN
        printf("    ");
        nsFrame::ListTag(stdout, pfd->mFrame);
        printf(": y=%d\n", pfd->mBounds.BStart(lineWM));
#endif
        break;
    }
    if (span) {
      nscoord fromStart = aDistanceFromStart + pfd->mBounds.BStart(lineWM);
      PlaceTopBottomFrames(span, fromStart, aLineBSize);
    }
  }
}

static nscoord
GetBSizeOfEmphasisMarks(nsIFrame* aSpanFrame, float aInflation)
{
  RefPtr<nsFontMetrics> fm = nsLayoutUtils::
    GetFontMetricsOfEmphasisMarks(aSpanFrame->StyleContext(), aInflation);
  return fm->MaxHeight();
}

void
nsLineLayout::AdjustLeadings(nsIFrame* spanFrame, PerSpanData* psd,
                             const nsStyleText* aStyleText, float aInflation,
                             bool* aZeroEffectiveSpanBox)
{
  MOZ_ASSERT(spanFrame == psd->mFrame->mFrame);
  nscoord requiredStartLeading = 0;
  nscoord requiredEndLeading = 0;
  if (spanFrame->GetType() == nsGkAtoms::rubyFrame) {
    // We may need to extend leadings here for ruby annotations as
    // required by section Line Spacing in the CSS Ruby spec.
    // See http://dev.w3.org/csswg/css-ruby/#line-height
    auto rubyFrame = static_cast<nsRubyFrame*>(spanFrame);
    RubyBlockLeadings leadings = rubyFrame->GetBlockLeadings();
    requiredStartLeading += leadings.mStart;
    requiredEndLeading += leadings.mEnd;
  }
  if (aStyleText->HasTextEmphasis()) {
    nscoord bsize = GetBSizeOfEmphasisMarks(spanFrame, aInflation);
    LogicalSide side = aStyleText->TextEmphasisSide(mRootSpan->mWritingMode);
    if (side == eLogicalSideBStart) {
      requiredStartLeading += bsize;
    } else {
      MOZ_ASSERT(side == eLogicalSideBEnd,
                 "emphasis marks must be in block axis");
      requiredEndLeading += bsize;
    }
  }

  nscoord requiredLeading = requiredStartLeading + requiredEndLeading;
  // If we do not require any additional leadings, don't touch anything
  // here even if it is greater than the original leading, because the
  // latter could be negative.
  if (requiredLeading != 0) {
    nscoord leading = psd->mBStartLeading + psd->mBEndLeading;
    nscoord deltaLeading = requiredLeading - leading;
    if (deltaLeading > 0) {
      // If the total leading is not wide enough for ruby annotations
      // and/or emphasis marks, extend the side which is not enough. If
      // both sides are not wide enough, replace the leadings with the
      // requested values.
      if (requiredStartLeading < psd->mBStartLeading) {
        psd->mBEndLeading += deltaLeading;
      } else if (requiredEndLeading < psd->mBEndLeading) {
        psd->mBStartLeading += deltaLeading;
      } else {
        psd->mBStartLeading = requiredStartLeading;
        psd->mBEndLeading = requiredEndLeading;
      }
      psd->mLogicalBSize += deltaLeading;
      // We have adjusted the leadings, it is no longer a zero
      // effective span box.
      *aZeroEffectiveSpanBox = false;
    }
  }
}

static float
GetInflationForBlockDirAlignment(nsIFrame* aFrame,
                                 nscoord aInflationMinFontSize)
{
  if (aFrame->IsSVGText()) {
    const nsIFrame* container =
      nsLayoutUtils::GetClosestFrameOfType(aFrame, nsGkAtoms::svgTextFrame);
    NS_ASSERTION(container, "expected to find an ancestor SVGTextFrame");
    return
      static_cast<const SVGTextFrame*>(container)->GetFontSizeScaleFactor();
  }
  return nsLayoutUtils::FontSizeInflationInner(aFrame, aInflationMinFontSize);
}

#define BLOCKDIR_ALIGN_FRAMES_NO_MINIMUM nscoord_MAX
#define BLOCKDIR_ALIGN_FRAMES_NO_MAXIMUM nscoord_MIN

// Place frames in the block direction within a given span (CSS property
// vertical-align) Note: this doesn't place frames with vertical-align:
// top or bottom as those have to wait until the entire line box block
// size is known. This is called after the span frame has finished being
// reflowed so that we know its block size.
void
nsLineLayout::VerticalAlignFrames(PerSpanData* psd)
{
  // Get parent frame info
  PerFrameData* spanFramePFD = psd->mFrame;
  nsIFrame* spanFrame = spanFramePFD->mFrame;

  // Get the parent frame's font for all of the frames in this span
  float inflation =
    GetInflationForBlockDirAlignment(spanFrame, mInflationMinFontSize);
  RefPtr<nsFontMetrics> fm =
    nsLayoutUtils::GetFontMetricsForFrame(spanFrame, inflation);

  bool preMode = mStyleText->WhiteSpaceIsSignificant();

  // See if the span is an empty continuation. It's an empty continuation iff:
  // - it has a prev-in-flow
  // - it has no next in flow
  // - it's zero sized
  WritingMode lineWM = mRootSpan->mWritingMode;
  bool emptyContinuation = psd != mRootSpan &&
    spanFrame->GetPrevInFlow() && !spanFrame->GetNextInFlow() &&
    spanFramePFD->mBounds.IsZeroSize();

#ifdef NOISY_BLOCKDIR_ALIGN
  printf("[%sSpan]", (psd == mRootSpan)?"Root":"");
  nsFrame::ListTag(stdout, spanFrame);
  printf(": preMode=%s strictMode=%s w/h=%d,%d emptyContinuation=%s",
         preMode ? "yes" : "no",
         mPresContext->CompatibilityMode() != eCompatibility_NavQuirks ? "yes" : "no",
         spanFramePFD->mBounds.ISize(lineWM),
         spanFramePFD->mBounds.BSize(lineWM),
         emptyContinuation ? "yes" : "no");
  if (psd != mRootSpan) {
    printf(" bp=%d,%d,%d,%d margin=%d,%d,%d,%d",
           spanFramePFD->mBorderPadding.Top(lineWM),
           spanFramePFD->mBorderPadding.Right(lineWM),
           spanFramePFD->mBorderPadding.Bottom(lineWM),
           spanFramePFD->mBorderPadding.Left(lineWM),
           spanFramePFD->mMargin.Top(lineWM),
           spanFramePFD->mMargin.Right(lineWM),
           spanFramePFD->mMargin.Bottom(lineWM),
           spanFramePFD->mMargin.Left(lineWM));
  }
  printf("\n");
#endif

  // Compute the span's zeroEffectiveSpanBox flag. What we are trying
  // to determine is how we should treat the span: should it act
  // "normally" according to css2 or should it effectively
  // "disappear".
  //
  // In general, if the document being processed is in full standards
  // mode then it should act normally (with one exception). The
  // exception case is when a span is continued and yet the span is
  // empty (e.g. compressed whitespace). For this kind of span we treat
  // it as if it were not there so that it doesn't impact the
  // line block-size.
  //
  // In almost standards mode or quirks mode, we should sometimes make
  // it disappear. The cases that matter are those where the span
  // contains no real text elements that would provide an ascent and
  // descent and height. However, if css style elements have been
  // applied to the span (border/padding/margin) so that it's clear the
  // document author is intending css2 behavior then we act as if strict
  // mode is set.
  //
  // This code works correctly for preMode, because a blank line
  // in PRE mode is encoded as a text node with a LF in it, since
  // text nodes with only whitespace are considered in preMode.
  //
  // Much of this logic is shared with the various implementations of
  // nsIFrame::IsEmpty since they need to duplicate the way it makes
  // some lines empty.  However, nsIFrame::IsEmpty can't be reused here
  // since this code sets zeroEffectiveSpanBox even when there are
  // non-empty children.
  bool zeroEffectiveSpanBox = false;
  // XXXldb If we really have empty continuations, then all these other
  // checks don't make sense for them.
  // XXXldb This should probably just use nsIFrame::IsSelfEmpty, assuming that
  // it agrees with this code.  (If it doesn't agree, it probably should.)
  if ((emptyContinuation ||
       mPresContext->CompatibilityMode() != eCompatibility_FullStandards) &&
      ((psd == mRootSpan) ||
       (spanFramePFD->mBorderPadding.IsAllZero() &&
        spanFramePFD->mMargin.IsAllZero()))) {
    // This code handles an issue with compatibility with non-css
    // conformant browsers. In particular, there are some cases
    // where the font-size and line-height for a span must be
    // ignored and instead the span must *act* as if it were zero
    // sized. In general, if the span contains any non-compressed
    // text then we don't use this logic.
    // However, this is not propagated outwards, since (in compatibility
    // mode) we don't want big line heights for things like
    // <p><font size="-1">Text</font></p>

    // We shouldn't include any whitespace that collapses, unless we're
    // preformatted (in which case it shouldn't, but the width=0 test is
    // perhaps incorrect).  This includes whitespace at the beginning of
    // a line and whitespace preceded (?) by other whitespace.
    // See bug 134580 and bug 155333.
    zeroEffectiveSpanBox = true;
    for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
      if (pfd->mIsTextFrame &&
          (pfd->mIsNonWhitespaceTextFrame || preMode ||
           pfd->mBounds.ISize(mRootSpan->mWritingMode) != 0)) {
        zeroEffectiveSpanBox = false;
        break;
      }
    }
  }

  // Setup baselineBCoord, minBCoord, and maxBCoord
  nscoord baselineBCoord, minBCoord, maxBCoord;
  if (psd == mRootSpan) {
    // Use a zero baselineBCoord since we don't yet know where the baseline
    // will be (until we know how tall the line is; then we will
    // know). In addition, use extreme values for the minBCoord and maxBCoord
    // values so that only the child frames will impact their values
    // (since these are children of the block, there is no span box to
    // provide initial values).
    baselineBCoord = 0;
    minBCoord = BLOCKDIR_ALIGN_FRAMES_NO_MINIMUM;
    maxBCoord = BLOCKDIR_ALIGN_FRAMES_NO_MAXIMUM;
#ifdef NOISY_BLOCKDIR_ALIGN
    printf("[RootSpan]");
    nsFrame::ListTag(stdout, spanFrame);
    printf(": pass1 valign frames: topEdge=%d minLineBSize=%d zeroEffectiveSpanBox=%s\n",
           mBStartEdge, mMinLineBSize,
           zeroEffectiveSpanBox ? "yes" : "no");
#endif
  }
  else {
    // Compute the logical block size for this span. The logical block size
    // is based on the "line-height" value, not the font-size. Also
    // compute the top leading.
    float inflation =
      GetInflationForBlockDirAlignment(spanFrame, mInflationMinFontSize);
    nscoord logicalBSize = ReflowInput::
      CalcLineHeight(spanFrame->GetContent(), spanFrame->StyleContext(),
                     mBlockReflowInput->ComputedHeight(),
                     inflation);
    nscoord contentBSize = spanFramePFD->mBounds.BSize(lineWM) -
      spanFramePFD->mBorderPadding.BStartEnd(lineWM);

    // Special-case for a ::first-letter frame, set the line height to
    // the frame block size if the user has left line-height == normal
    const nsStyleText* styleText = spanFrame->StyleText();
    if (spanFramePFD->mIsLetterFrame &&
        !spanFrame->GetPrevInFlow() &&
        styleText->mLineHeight.GetUnit() == eStyleUnit_Normal) {
      logicalBSize = spanFramePFD->mBounds.BSize(lineWM);
    }

    nscoord leading = logicalBSize - contentBSize;
    psd->mBStartLeading = leading / 2;
    psd->mBEndLeading = leading - psd->mBStartLeading;
    psd->mLogicalBSize = logicalBSize;
    AdjustLeadings(spanFrame, psd, styleText, inflation,
                   &zeroEffectiveSpanBox);

    if (zeroEffectiveSpanBox) {
      // When the span-box is to be ignored, zero out the initial
      // values so that the span doesn't impact the final line
      // height. The contents of the span can impact the final line
      // height.

      // Note that things are readjusted for this span after its children
      // are reflowed
      minBCoord = BLOCKDIR_ALIGN_FRAMES_NO_MINIMUM;
      maxBCoord = BLOCKDIR_ALIGN_FRAMES_NO_MAXIMUM;
    }
    else {

      // The initial values for the min and max block coord values are in the
      // span's coordinate space, and cover the logical block size of the span.
      // If there are child frames in this span that stick out of this area
      // then the minBCoord and maxBCoord are updated by the amount of logical
      // blockSize that is outside this range.
      minBCoord = spanFramePFD->mBorderPadding.BStart(lineWM) -
                  psd->mBStartLeading;
      maxBCoord = minBCoord + psd->mLogicalBSize;
    }

    // This is the distance from the top edge of the parents visual
    // box to the baseline. The span already computed this for us,
    // so just use it.
    *psd->mBaseline = baselineBCoord = spanFramePFD->mAscent;


#ifdef NOISY_BLOCKDIR_ALIGN
    printf("[%sSpan]", (psd == mRootSpan)?"Root":"");
    nsFrame::ListTag(stdout, spanFrame);
    printf(": baseLine=%d logicalBSize=%d topLeading=%d h=%d bp=%d,%d zeroEffectiveSpanBox=%s\n",
           baselineBCoord, psd->mLogicalBSize, psd->mBStartLeading,
           spanFramePFD->mBounds.BSize(lineWM),
           spanFramePFD->mBorderPadding.Top(lineWM),
           spanFramePFD->mBorderPadding.Bottom(lineWM),
           zeroEffectiveSpanBox ? "yes" : "no");
#endif
  }

  nscoord maxStartBoxBSize = 0;
  nscoord maxEndBoxBSize = 0;
  PerFrameData* pfd = psd->mFirstFrame;
  while (nullptr != pfd) {
    nsIFrame* frame = pfd->mFrame;

    // sanity check (see bug 105168, non-reproducible crashes from null frame)
    NS_ASSERTION(frame, "null frame in PerFrameData - something is very very bad");
    if (!frame) {
      return;
    }

    // Compute the logical block size of the frame
    nscoord logicalBSize;
    PerSpanData* frameSpan = pfd->mSpan;
    if (frameSpan) {
      // For span frames the logical-block-size and start-leading were
      // pre-computed when the span was reflowed.
      logicalBSize = frameSpan->mLogicalBSize;
    }
    else {
      // For other elements the logical block size is the same as the
      // frame's block size plus its margins.
      logicalBSize = pfd->mBounds.BSize(lineWM) +
                     pfd->mMargin.BStartEnd(lineWM);
      if (logicalBSize < 0 &&
          mPresContext->CompatibilityMode() == eCompatibility_NavQuirks) {
        pfd->mAscent -= logicalBSize;
        logicalBSize = 0;
      }
    }

    // Get vertical-align property ("vertical-align" is the CSS name for
    // block-direction align)
    const nsStyleCoord& verticalAlign = frame->StyleDisplay()->mVerticalAlign;
    uint8_t verticalAlignEnum = frame->VerticalAlignEnum();
#ifdef NOISY_BLOCKDIR_ALIGN
    printf("  [frame]");
    nsFrame::ListTag(stdout, frame);
    printf(": verticalAlignUnit=%d (enum == %d",
           verticalAlign.GetUnit(),
           ((eStyleUnit_Enumerated == verticalAlign.GetUnit())
            ? verticalAlign.GetIntValue()
            : -1));
    if (verticalAlignEnum != nsIFrame::eInvalidVerticalAlign) {
      printf(", after SVG dominant-baseline conversion == %d",
             verticalAlignEnum);
    }
    printf(")\n");
#endif

    if (verticalAlignEnum != nsIFrame::eInvalidVerticalAlign) {
      if (lineWM.IsVertical()) {
        if (verticalAlignEnum == NS_STYLE_VERTICAL_ALIGN_MIDDLE) {
          // For vertical writing mode where the dominant baseline is centered
          // (i.e. text-orientation is not sideways-*), we remap 'middle' to
          // 'middle-with-baseline' so that images align sensibly with the
          // center-baseline-aligned text.
          if (!lineWM.IsSideways()) {
            verticalAlignEnum = NS_STYLE_VERTICAL_ALIGN_MIDDLE_WITH_BASELINE;
          }
        } else if (lineWM.IsLineInverted()) {
          // Swap the meanings of top and bottom when line is inverted
          // relative to block direction.
          switch (verticalAlignEnum) {
            case NS_STYLE_VERTICAL_ALIGN_TOP:
              verticalAlignEnum = NS_STYLE_VERTICAL_ALIGN_BOTTOM;
              break;
            case NS_STYLE_VERTICAL_ALIGN_BOTTOM:
              verticalAlignEnum = NS_STYLE_VERTICAL_ALIGN_TOP;
              break;
            case NS_STYLE_VERTICAL_ALIGN_TEXT_TOP:
              verticalAlignEnum = NS_STYLE_VERTICAL_ALIGN_TEXT_BOTTOM;
              break;
            case NS_STYLE_VERTICAL_ALIGN_TEXT_BOTTOM:
              verticalAlignEnum = NS_STYLE_VERTICAL_ALIGN_TEXT_TOP;
              break;
          }
        }
      }

      // baseline coord that may be adjusted for script offset
      nscoord revisedBaselineBCoord = baselineBCoord;

      // For superscript and subscript, raise or lower the baseline of the box
      // to the proper offset of the parent's box, then proceed as for BASELINE
      if (verticalAlignEnum == NS_STYLE_VERTICAL_ALIGN_SUB ||
          verticalAlignEnum == NS_STYLE_VERTICAL_ALIGN_SUPER) {
        revisedBaselineBCoord += lineWM.FlowRelativeToLineRelativeFactor() *
          (verticalAlignEnum == NS_STYLE_VERTICAL_ALIGN_SUB
            ? fm->SubscriptOffset() : -fm->SuperscriptOffset());
        verticalAlignEnum = NS_STYLE_VERTICAL_ALIGN_BASELINE;
      }

      switch (verticalAlignEnum) {
        default:
        case NS_STYLE_VERTICAL_ALIGN_BASELINE:
          if (lineWM.IsVertical() && !lineWM.IsSideways()) {
            if (frameSpan) {
              pfd->mBounds.BStart(lineWM) = revisedBaselineBCoord -
                                            pfd->mBounds.BSize(lineWM)/2;
            } else {
              pfd->mBounds.BStart(lineWM) = revisedBaselineBCoord -
                                            logicalBSize/2 +
                                            pfd->mMargin.BStart(lineWM);
            }
          } else {
            pfd->mBounds.BStart(lineWM) = revisedBaselineBCoord - pfd->mAscent;
          }
          pfd->mBlockDirAlign = VALIGN_OTHER;
          break;

        case NS_STYLE_VERTICAL_ALIGN_TOP:
        {
          pfd->mBlockDirAlign = VALIGN_TOP;
          nscoord subtreeBSize = logicalBSize;
          if (frameSpan) {
            subtreeBSize = frameSpan->mMaxBCoord - frameSpan->mMinBCoord;
            NS_ASSERTION(subtreeBSize >= logicalBSize,
                         "unexpected subtree block size");
          }
          if (subtreeBSize > maxStartBoxBSize) {
            maxStartBoxBSize = subtreeBSize;
          }
          break;
        }

        case NS_STYLE_VERTICAL_ALIGN_BOTTOM:
        {
          pfd->mBlockDirAlign = VALIGN_BOTTOM;
          nscoord subtreeBSize = logicalBSize;
          if (frameSpan) {
            subtreeBSize = frameSpan->mMaxBCoord - frameSpan->mMinBCoord;
            NS_ASSERTION(subtreeBSize >= logicalBSize,
                         "unexpected subtree block size");
          }
          if (subtreeBSize > maxEndBoxBSize) {
            maxEndBoxBSize = subtreeBSize;
          }
          break;
        }

        case NS_STYLE_VERTICAL_ALIGN_MIDDLE:
        {
          // Align the midpoint of the frame with 1/2 the parents
          // x-height above the baseline.
          nscoord parentXHeight =
            lineWM.FlowRelativeToLineRelativeFactor() * fm->XHeight();
          if (frameSpan) {
            pfd->mBounds.BStart(lineWM) = baselineBCoord -
              (parentXHeight + pfd->mBounds.BSize(lineWM))/2;
          }
          else {
            pfd->mBounds.BStart(lineWM) = baselineBCoord -
              (parentXHeight + logicalBSize)/2 +
              pfd->mMargin.BStart(lineWM);
          }
          pfd->mBlockDirAlign = VALIGN_OTHER;
          break;
        }

        case NS_STYLE_VERTICAL_ALIGN_TEXT_TOP:
        {
          // The top of the logical box is aligned with the top of
          // the parent element's text.
          // XXX For vertical text we will need a new API to get the logical
          //     max-ascent here
          nscoord parentAscent =
            lineWM.IsLineInverted() ? fm->MaxDescent() : fm->MaxAscent();
          if (frameSpan) {
            pfd->mBounds.BStart(lineWM) = baselineBCoord - parentAscent -
              pfd->mBorderPadding.BStart(lineWM) + frameSpan->mBStartLeading;
          }
          else {
            pfd->mBounds.BStart(lineWM) = baselineBCoord - parentAscent +
                                          pfd->mMargin.BStart(lineWM);
          }
          pfd->mBlockDirAlign = VALIGN_OTHER;
          break;
        }

        case NS_STYLE_VERTICAL_ALIGN_TEXT_BOTTOM:
        {
          // The bottom of the logical box is aligned with the
          // bottom of the parent elements text.
          nscoord parentDescent =
            lineWM.IsLineInverted() ? fm->MaxAscent() : fm->MaxDescent();
          if (frameSpan) {
            pfd->mBounds.BStart(lineWM) = baselineBCoord + parentDescent -
                                          pfd->mBounds.BSize(lineWM) +
                                          pfd->mBorderPadding.BEnd(lineWM) -
                                          frameSpan->mBEndLeading;
          }
          else {
            pfd->mBounds.BStart(lineWM) = baselineBCoord + parentDescent -
                                          pfd->mBounds.BSize(lineWM) -
                                          pfd->mMargin.BEnd(lineWM);
          }
          pfd->mBlockDirAlign = VALIGN_OTHER;
          break;
        }

        case NS_STYLE_VERTICAL_ALIGN_MIDDLE_WITH_BASELINE:
        {
          // Align the midpoint of the frame with the baseline of the parent.
          if (frameSpan) {
            pfd->mBounds.BStart(lineWM) = baselineBCoord -
                                          pfd->mBounds.BSize(lineWM)/2;
          }
          else {
            pfd->mBounds.BStart(lineWM) = baselineBCoord - logicalBSize/2 +
                                          pfd->mMargin.BStart(lineWM);
          }
          pfd->mBlockDirAlign = VALIGN_OTHER;
          break;
        }
      }
    } else {
      // We have either a coord, a percent, or a calc().
      nscoord pctBasis = 0;
      if (verticalAlign.HasPercent()) {
        // Percentages are like lengths, except treated as a percentage
        // of the elements line block size value.
        float inflation =
          GetInflationForBlockDirAlignment(frame, mInflationMinFontSize);
        pctBasis = ReflowInput::CalcLineHeight(frame->GetContent(),
          frame->StyleContext(), mBlockReflowInput->ComputedBSize(),
          inflation);
      }
      nscoord offset =
        nsRuleNode::ComputeCoordPercentCalc(verticalAlign, pctBasis);
      // According to the CSS2 spec (10.8.1), a positive value
      // "raises" the box by the given distance while a negative value
      // "lowers" the box by the given distance (with zero being the
      // baseline). Since Y coordinates increase towards the bottom of
      // the screen we reverse the sign, unless the line orientation is
      // inverted relative to block direction.
      nscoord revisedBaselineBCoord = baselineBCoord - offset *
        lineWM.FlowRelativeToLineRelativeFactor();
      if (lineWM.IsVertical() && !lineWM.IsSideways()) {
        // If we're using a dominant center baseline, we align with the center
        // of the frame being placed (bug 1133945).
        pfd->mBounds.BStart(lineWM) =
          revisedBaselineBCoord - pfd->mBounds.BSize(lineWM)/2;
      } else {
        pfd->mBounds.BStart(lineWM) = revisedBaselineBCoord - pfd->mAscent;
      }
      pfd->mBlockDirAlign = VALIGN_OTHER;
    }

    // Update minBCoord/maxBCoord for frames that we just placed. Do not factor
    // text into the equation.
    if (pfd->mBlockDirAlign == VALIGN_OTHER) {
      // Text frames do not contribute to the min/max Y values for the
      // line (instead their parent frame's font-size contributes).
      // XXXrbs -- relax this restriction because it causes text frames
      //           to jam together when 'font-size-adjust' is enabled
      //           and layout is using dynamic font heights (bug 20394)
      //        -- Note #1: With this code enabled and with the fact that we are not
      //           using Em[Ascent|Descent] as nsDimensions for text metrics in
      //           GFX mean that the discussion in bug 13072 cannot hold.
      //        -- Note #2: We still don't want empty-text frames to interfere.
      //           For example in quirks mode, avoiding empty text frames prevents
      //           "tall" lines around elements like <hr> since the rules of <hr>
      //           in quirks.css have pseudo text contents with LF in them.
#if 0
      if (!pfd->mIsTextFrame) {
#else
      // Only consider non empty text frames when line-height=normal
      bool canUpdate = !pfd->mIsTextFrame;
      if (!canUpdate && pfd->mIsNonWhitespaceTextFrame) {
        canUpdate =
          frame->StyleText()->mLineHeight.GetUnit() == eStyleUnit_Normal;
      }
      if (canUpdate) {
#endif
        nscoord blockStart, blockEnd;
        if (frameSpan) {
          // For spans that were are now placing, use their position
          // plus their already computed min-Y and max-Y values for
          // computing blockStart and blockEnd.
          blockStart = pfd->mBounds.BStart(lineWM) + frameSpan->mMinBCoord;
          blockEnd = pfd->mBounds.BStart(lineWM) + frameSpan->mMaxBCoord;
        }
        else {
          blockStart = pfd->mBounds.BStart(lineWM) -
                       pfd->mMargin.BStart(lineWM);
          blockEnd = blockStart + logicalBSize;
        }
        if (!preMode &&
            mPresContext->CompatibilityMode() != eCompatibility_FullStandards &&
            !logicalBSize) {
          // Check if it's a BR frame that is not alone on its line (it
          // is given a block size of zero to indicate this), and if so reset
          // blockStart and blockEnd so that BR frames don't influence the line.
          if (nsGkAtoms::brFrame == frame->GetType()) {
            blockStart = BLOCKDIR_ALIGN_FRAMES_NO_MINIMUM;
            blockEnd = BLOCKDIR_ALIGN_FRAMES_NO_MAXIMUM;
          }
        }
        if (blockStart < minBCoord) minBCoord = blockStart;
        if (blockEnd > maxBCoord) maxBCoord = blockEnd;
#ifdef NOISY_BLOCKDIR_ALIGN
        printf("     [frame]raw: a=%d h=%d bp=%d,%d logical: h=%d leading=%d y=%d minBCoord=%d maxBCoord=%d\n",
               pfd->mAscent, pfd->mBounds.BSize(lineWM),
               pfd->mBorderPadding.Top(lineWM),
               pfd->mBorderPadding.Bottom(lineWM),
               logicalBSize,
               frameSpan ? frameSpan->mBStartLeading : 0,
               pfd->mBounds.BStart(lineWM), minBCoord, maxBCoord);
#endif
      }
      if (psd != mRootSpan) {
        frame->SetRect(lineWM, pfd->mBounds, ContainerSizeForSpan(psd));
      }
    }
    pfd = pfd->mNext;
  }

  // Factor in the minimum line block-size when handling the root-span for
  // the block.
  if (psd == mRootSpan) {
    // We should factor in the block element's minimum line-height (as
    // defined in section 10.8.1 of the css2 spec) assuming that
    // zeroEffectiveSpanBox is not set on the root span.  This only happens
    // in some cases in quirks mode:
    //  (1) if the root span contains non-whitespace text directly (this
    //      is handled by zeroEffectiveSpanBox
    //  (2) if this line has a bullet
    //  (3) if this is the last line of an LI, DT, or DD element
    //      (The last line before a block also counts, but not before a
    //      BR) (NN4/IE5 quirk)

    // (1) and (2) above
    bool applyMinLH = !zeroEffectiveSpanBox || mHasBullet;
    bool isLastLine = !mGotLineBox ||
      (!mLineBox->IsLineWrapped() && !mLineEndsInBR);
    if (!applyMinLH && isLastLine) {
      nsIContent* blockContent = mRootSpan->mFrame->mFrame->GetContent();
      if (blockContent) {
        // (3) above, if the last line of LI, DT, or DD
        if (blockContent->IsAnyOfHTMLElements(nsGkAtoms::li,
                                              nsGkAtoms::dt,
                                              nsGkAtoms::dd)) {
          applyMinLH = true;
        }
      }
    }
    if (applyMinLH) {
      if (psd->mHasNonemptyContent || preMode || mHasBullet) {
#ifdef NOISY_BLOCKDIR_ALIGN
        printf("  [span]==> adjusting min/maxBCoord: currentValues: %d,%d", minBCoord, maxBCoord);
#endif
        nscoord minimumLineBSize = mMinLineBSize;
        nscoord blockStart =
          -nsLayoutUtils::GetCenteredFontBaseline(fm, minimumLineBSize,
                                                  lineWM.IsLineInverted());
        nscoord blockEnd = blockStart + minimumLineBSize;

        if (mStyleText->HasTextEmphasis()) {
          nscoord fontMaxHeight = fm->MaxHeight();
          nscoord emphasisHeight =
            GetBSizeOfEmphasisMarks(spanFrame, inflation);
          nscoord delta = fontMaxHeight + emphasisHeight - minimumLineBSize;
          if (delta > 0) {
            if (minimumLineBSize < fontMaxHeight) {
              // If the leadings are negative, fill them first.
              nscoord ascent = fm->MaxAscent();
              nscoord descent = fm->MaxDescent();
              if (lineWM.IsLineInverted()) {
                Swap(ascent, descent);
              }
              blockStart = -ascent;
              blockEnd = descent;
              delta = emphasisHeight;
            }
            LogicalSide side = mStyleText->TextEmphasisSide(lineWM);
            if (side == eLogicalSideBStart) {
              blockStart -= delta;
            } else {
              blockEnd += delta;
            }
          }
        }

        if (blockStart < minBCoord) minBCoord = blockStart;
        if (blockEnd > maxBCoord) maxBCoord = blockEnd;

#ifdef NOISY_BLOCKDIR_ALIGN
        printf(" new values: %d,%d\n", minBCoord, maxBCoord);
#endif
#ifdef NOISY_BLOCKDIR_ALIGN
        printf("            Used mMinLineBSize: %d, blockStart: %d, blockEnd: %d\n", mMinLineBSize, blockStart, blockEnd);
#endif
      }
      else {
        // XXX issues:
        // [1] BR's on empty lines stop working
        // [2] May not honor css2's notion of handling empty elements
        // [3] blank lines in a pre-section ("\n") (handled with preMode)

        // XXX Are there other problems with this?
#ifdef NOISY_BLOCKDIR_ALIGN
        printf("  [span]==> zapping min/maxBCoord: currentValues: %d,%d newValues: 0,0\n",
               minBCoord, maxBCoord);
#endif
        minBCoord = maxBCoord = 0;
      }
    }
  }

  if ((minBCoord == BLOCKDIR_ALIGN_FRAMES_NO_MINIMUM) ||
      (maxBCoord == BLOCKDIR_ALIGN_FRAMES_NO_MAXIMUM)) {
    minBCoord = maxBCoord = baselineBCoord;
  }

  if (psd != mRootSpan && zeroEffectiveSpanBox) {
#ifdef NOISY_BLOCKDIR_ALIGN
    printf("   [span]adjusting for zeroEffectiveSpanBox\n");
    printf("     Original: minBCoord=%d, maxBCoord=%d, bSize=%d, ascent=%d, logicalBSize=%d, topLeading=%d, bottomLeading=%d\n",
           minBCoord, maxBCoord, spanFramePFD->mBounds.BSize(lineWM),
           spanFramePFD->mAscent,
           psd->mLogicalBSize, psd->mBStartLeading, psd->mBEndLeading);
#endif
    nscoord goodMinBCoord =
      spanFramePFD->mBorderPadding.BStart(lineWM) - psd->mBStartLeading;
    nscoord goodMaxBCoord = goodMinBCoord + psd->mLogicalBSize;

    // For cases like the one in bug 714519 (text-decoration placement
    // or making nsLineLayout::IsZeroBSize() handle
    // vertical-align:top/bottom on a descendant of the line that's not
    // a child of it), we want to treat elements that are
    // vertical-align: top or bottom somewhat like children for the
    // purposes of this quirk.  To some extent, this is guessing, since
    // they might end up being aligned anywhere.  However, we'll guess
    // that they'll be placed aligned with the top or bottom of this
    // frame (as though this frame is the only thing in the line).
    // (Guessing isn't crazy, since all we're doing is reducing the
    // scope of a quirk and making the behavior more standards-like.)
    if (maxStartBoxBSize > maxBCoord - minBCoord) {
      // Distribute maxStartBoxBSize to ascent (baselineBCoord - minBCoord), and
      // then to descent (maxBCoord - baselineBCoord) by adjusting minBCoord or
      // maxBCoord, but not to exceed goodMinBCoord and goodMaxBCoord.
      nscoord distribute = maxStartBoxBSize - (maxBCoord - minBCoord);
      nscoord ascentSpace = std::max(minBCoord - goodMinBCoord, 0);
      if (distribute > ascentSpace) {
        distribute -= ascentSpace;
        minBCoord -= ascentSpace;
        nscoord descentSpace = std::max(goodMaxBCoord - maxBCoord, 0);
        if (distribute > descentSpace) {
          maxBCoord += descentSpace;
        } else {
          maxBCoord += distribute;
        }
      } else {
        minBCoord -= distribute;
      }
    }
    if (maxEndBoxBSize > maxBCoord - minBCoord) {
      // Likewise, but preferring descent to ascent.
      nscoord distribute = maxEndBoxBSize - (maxBCoord - minBCoord);
      nscoord descentSpace = std::max(goodMaxBCoord - maxBCoord, 0);
      if (distribute > descentSpace) {
        distribute -= descentSpace;
        maxBCoord += descentSpace;
        nscoord ascentSpace = std::max(minBCoord - goodMinBCoord, 0);
        if (distribute > ascentSpace) {
          minBCoord -= ascentSpace;
        } else {
          minBCoord -= distribute;
        }
      } else {
        maxBCoord += distribute;
      }
    }

    if (minBCoord > goodMinBCoord) {
      nscoord adjust = minBCoord - goodMinBCoord; // positive

      // shrink the logical extents
      psd->mLogicalBSize -= adjust;
      psd->mBStartLeading -= adjust;
    }
    if (maxBCoord < goodMaxBCoord) {
      nscoord adjust = goodMaxBCoord - maxBCoord;
      psd->mLogicalBSize -= adjust;
      psd->mBEndLeading -= adjust;
    }
    if (minBCoord > 0) {

      // shrink the content by moving its block start down.  This is tricky,
      // since the block start is the 0 for many coordinates, so what we do is
      // move everything else up.
      spanFramePFD->mAscent -= minBCoord; // move the baseline up
      spanFramePFD->mBounds.BSize(lineWM) -= minBCoord; // move the block end up
      psd->mBStartLeading += minBCoord;
      *psd->mBaseline -= minBCoord;

      pfd = psd->mFirstFrame;
      while (nullptr != pfd) {
        pfd->mBounds.BStart(lineWM) -= minBCoord; // move all the children
                                                  // back up
        pfd->mFrame->SetRect(lineWM, pfd->mBounds, ContainerSizeForSpan(psd));
        pfd = pfd->mNext;
      }
      maxBCoord -= minBCoord; // since minBCoord is in the frame's own
                              // coordinate system
      minBCoord = 0;
    }
    if (maxBCoord < spanFramePFD->mBounds.BSize(lineWM)) {
      nscoord adjust = spanFramePFD->mBounds.BSize(lineWM) - maxBCoord;
      spanFramePFD->mBounds.BSize(lineWM) -= adjust; // move the bottom up
      psd->mBEndLeading += adjust;
    }
#ifdef NOISY_BLOCKDIR_ALIGN
    printf("     New: minBCoord=%d, maxBCoord=%d, bSize=%d, ascent=%d, logicalBSize=%d, topLeading=%d, bottomLeading=%d\n",
           minBCoord, maxBCoord, spanFramePFD->mBounds.BSize(lineWM),
           spanFramePFD->mAscent,
           psd->mLogicalBSize, psd->mBStartLeading, psd->mBEndLeading);
#endif
  }

  psd->mMinBCoord = minBCoord;
  psd->mMaxBCoord = maxBCoord;
#ifdef NOISY_BLOCKDIR_ALIGN
  printf("  [span]==> minBCoord=%d maxBCoord=%d delta=%d maxStartBoxBSize=%d maxEndBoxBSize=%d\n",
         minBCoord, maxBCoord, maxBCoord - minBCoord, maxStartBoxBSize, maxEndBoxBSize);
#endif
  if (maxStartBoxBSize > mMaxStartBoxBSize) {
    mMaxStartBoxBSize = maxStartBoxBSize;
  }
  if (maxEndBoxBSize > mMaxEndBoxBSize) {
    mMaxEndBoxBSize = maxEndBoxBSize;
  }
}

static void SlideSpanFrameRect(nsIFrame* aFrame, nscoord aDeltaWidth)
{
  // This should not use nsIFrame::MovePositionBy because it happens
  // prior to relative positioning.  In particular, because
  // nsBlockFrame::PlaceLine calls aLineLayout.TrimTrailingWhiteSpace()
  // prior to calling aLineLayout.RelativePositionFrames().
  nsPoint p = aFrame->GetPosition();
  p.x -= aDeltaWidth;
  aFrame->SetPosition(p);
}

bool
nsLineLayout::TrimTrailingWhiteSpaceIn(PerSpanData* psd,
                                       nscoord* aDeltaISize)
{
  PerFrameData* pfd = psd->mFirstFrame;
  if (!pfd) {
    *aDeltaISize = 0;
    return false;
  }
  pfd = pfd->Last();
  while (nullptr != pfd) {
#ifdef REALLY_NOISY_TRIM
    nsFrame::ListTag(stdout, psd->mFrame->mFrame);
    printf(": attempting trim of ");
    nsFrame::ListTag(stdout, pfd->mFrame);
    printf("\n");
#endif
    PerSpanData* childSpan = pfd->mSpan;
    WritingMode lineWM = mRootSpan->mWritingMode;
    if (childSpan) {
      // Maybe the child span has the trailing white-space in it?
      if (TrimTrailingWhiteSpaceIn(childSpan, aDeltaISize)) {
        nscoord deltaISize = *aDeltaISize;
        if (deltaISize) {
          // Adjust the child spans frame size
          pfd->mBounds.ISize(lineWM) -= deltaISize;
          if (psd != mRootSpan) {
            // When the child span is not a direct child of the block
            // we need to update the child spans frame rectangle
            // because it most likely will not be done again. Spans
            // that are direct children of the block will be updated
            // later, however, because the VerticalAlignFrames method
            // will be run after this method.
            nsSize containerSize = ContainerSizeForSpan(childSpan);
            nsIFrame* f = pfd->mFrame;
            LogicalRect r(lineWM, f->GetRect(), containerSize);
            r.ISize(lineWM) -= deltaISize;
            f->SetRect(lineWM, r, containerSize);
          }

          // Adjust the inline end edge of the span that contains the child span
          psd->mICoord -= deltaISize;

          // Slide any frames that follow the child span over by the
          // correct amount. The only thing that can follow the child
          // span is empty stuff, so we are just making things
          // sensible (keeping the combined area honest).
          while (pfd->mNext) {
            pfd = pfd->mNext;
            pfd->mBounds.IStart(lineWM) -= deltaISize;
            if (psd != mRootSpan) {
              // When the child span is not a direct child of the block
              // we need to update the child span's frame rectangle
              // because it most likely will not be done again. Spans
              // that are direct children of the block will be updated
              // later, however, because the VerticalAlignFrames method
              // will be run after this method.
              SlideSpanFrameRect(pfd->mFrame, deltaISize);
            }
          }
        }
        return true;
      }
    }
    else if (!pfd->mIsTextFrame && !pfd->mSkipWhenTrimmingWhitespace) {
      // If we hit a frame on the end that's not text and not a placeholder,
      // then there is no trailing whitespace to trim. Stop the search.
      *aDeltaISize = 0;
      return true;
    }
    else if (pfd->mIsTextFrame) {
      // Call TrimTrailingWhiteSpace even on empty textframes because they
      // might have a soft hyphen which should now appear, changing the frame's
      // width
      nsTextFrame::TrimOutput trimOutput = static_cast<nsTextFrame*>(pfd->mFrame)->
          TrimTrailingWhiteSpace(mBlockReflowInput->mRenderingContext->GetDrawTarget());
#ifdef NOISY_TRIM
      nsFrame::ListTag(stdout, psd->mFrame->mFrame);
      printf(": trim of ");
      nsFrame::ListTag(stdout, pfd->mFrame);
      printf(" returned %d\n", trimOutput.mDeltaWidth);
#endif

      if (trimOutput.mChanged) {
        pfd->mRecomputeOverflow = true;
      }

      // Delta width not being zero means that
      // there is trimmed space in the frame.
      if (trimOutput.mDeltaWidth) {
        pfd->mBounds.ISize(lineWM) -= trimOutput.mDeltaWidth;

        // If any trailing space is trimmed, the justification opportunity
        // generated by the space should be removed as well.
        pfd->mJustificationInfo.CancelOpportunityForTrimmedSpace();

        // See if the text frame has already been placed in its parent
        if (psd != mRootSpan) {
          // The frame was already placed during psd's
          // reflow. Update the frames rectangle now.
          pfd->mFrame->SetRect(lineWM, pfd->mBounds,
                               ContainerSizeForSpan(psd));
        }

        // Adjust containing span's right edge
        psd->mICoord -= trimOutput.mDeltaWidth;

        // Slide any frames that follow the text frame over by the
        // right amount. The only thing that can follow the text
        // frame is empty stuff, so we are just making things
        // sensible (keeping the combined area honest).
        while (pfd->mNext) {
          pfd = pfd->mNext;
          pfd->mBounds.IStart(lineWM) -= trimOutput.mDeltaWidth;
          if (psd != mRootSpan) {
            // When the child span is not a direct child of the block
            // we need to update the child spans frame rectangle
            // because it most likely will not be done again. Spans
            // that are direct children of the block will be updated
            // later, however, because the VerticalAlignFrames method
            // will be run after this method.
            SlideSpanFrameRect(pfd->mFrame, trimOutput.mDeltaWidth);
          }
        }
      }

      if (pfd->mIsNonEmptyTextFrame || trimOutput.mChanged) {
        // Pass up to caller so they can shrink their span
        *aDeltaISize = trimOutput.mDeltaWidth;
        return true;
      }
    }
    pfd = pfd->mPrev;
  }

  *aDeltaISize = 0;
  return false;
}

bool
nsLineLayout::TrimTrailingWhiteSpace()
{
  PerSpanData* psd = mRootSpan;
  nscoord deltaISize;
  TrimTrailingWhiteSpaceIn(psd, &deltaISize);
  return 0 != deltaISize;
}

bool
nsLineLayout::PerFrameData::ParticipatesInJustification() const
{
  if (mIsBullet || mIsEmpty || mSkipWhenTrimmingWhitespace) {
    // Skip bullets, empty frames, and placeholders
    return false;
  }
  if (mIsTextFrame && !mIsNonWhitespaceTextFrame &&
      static_cast<nsTextFrame*>(mFrame)->IsAtEndOfLine()) {
    // Skip trimmed whitespaces
    return false;
  }
  return true;
}

struct nsLineLayout::JustificationComputationState
{
  PerFrameData* mFirstParticipant;
  PerFrameData* mLastParticipant;
  // When we are going across a boundary of ruby base, i.e. entering
  // one, leaving one, or both, the following fields will be set to
  // the corresponding ruby base frame for handling ruby-align.
  PerFrameData* mLastExitedRubyBase;
  PerFrameData* mLastEnteredRubyBase;

  JustificationComputationState()
    : mFirstParticipant(nullptr)
    , mLastParticipant(nullptr)
    , mLastExitedRubyBase(nullptr)
    , mLastEnteredRubyBase(nullptr) { }
};

static bool
IsRubyAlignSpaceAround(nsIFrame* aRubyBase)
{
  return aRubyBase->StyleText()->mRubyAlign == NS_STYLE_RUBY_ALIGN_SPACE_AROUND;
}

/**
 * Assign justification gaps for justification
 * opportunities across two frames.
 */
/* static */ int
nsLineLayout::AssignInterframeJustificationGaps(
  PerFrameData* aFrame, JustificationComputationState& aState)
{
  PerFrameData* prev = aState.mLastParticipant;
  MOZ_ASSERT(prev);

  auto& assign = aFrame->mJustificationAssignment;
  auto& prevAssign = prev->mJustificationAssignment;

  if (aState.mLastExitedRubyBase || aState.mLastEnteredRubyBase) {
    PerFrameData* exitedRubyBase = aState.mLastExitedRubyBase;
    if (!exitedRubyBase || IsRubyAlignSpaceAround(exitedRubyBase->mFrame)) {
      prevAssign.mGapsAtEnd = 1;
    } else {
      exitedRubyBase->mJustificationAssignment.mGapsAtEnd = 1;
    }

    PerFrameData* enteredRubyBase = aState.mLastEnteredRubyBase;
    if (!enteredRubyBase || IsRubyAlignSpaceAround(enteredRubyBase->mFrame)) {
      assign.mGapsAtStart = 1;
    } else {
      enteredRubyBase->mJustificationAssignment.mGapsAtStart = 1;
    }

    // We are no longer going across a ruby base boundary.
    aState.mLastExitedRubyBase = nullptr;
    aState.mLastEnteredRubyBase = nullptr;
    return 1;
  }

  const auto& info = aFrame->mJustificationInfo;
  const auto& prevInfo = prev->mJustificationInfo;
  if (!info.mIsStartJustifiable && !prevInfo.mIsEndJustifiable) {
    return 0;
  }

  if (!info.mIsStartJustifiable) {
    prevAssign.mGapsAtEnd = 2;
    assign.mGapsAtStart = 0;
  } else if (!prevInfo.mIsEndJustifiable) {
    prevAssign.mGapsAtEnd = 0;
    assign.mGapsAtStart = 2;
  } else {
    prevAssign.mGapsAtEnd = 1;
    assign.mGapsAtStart = 1;
  }
  return 1;
}

/**
 * Compute the justification info of the given span, and store the
 * number of inner opportunities into the frame's justification info.
 * It returns the number of non-inner opportunities it detects.
 */
int32_t
nsLineLayout::ComputeFrameJustification(PerSpanData* aPSD,
                                        JustificationComputationState& aState)
{
  NS_ASSERTION(aPSD, "null arg");
  NS_ASSERTION(!aState.mLastParticipant || !aState.mLastParticipant->mSpan,
               "Last participant shall always be a leaf frame");
  bool firstChild = true;
  int32_t& innerOpportunities =
    aPSD->mFrame->mJustificationInfo.mInnerOpportunities;
  MOZ_ASSERT(innerOpportunities == 0,
             "Justification info should not have been set yet.");
  int32_t outerOpportunities = 0;

  for (PerFrameData* pfd = aPSD->mFirstFrame; pfd; pfd = pfd->mNext) {
    if (!pfd->ParticipatesInJustification()) {
      continue;
    }

    bool isRubyBase = pfd->mFrame->GetType() == nsGkAtoms::rubyBaseFrame;
    PerFrameData* outerRubyBase = aState.mLastEnteredRubyBase;
    if (isRubyBase) {
      aState.mLastEnteredRubyBase = pfd;
    }

    int extraOpportunities = 0;
    if (pfd->mSpan) {
      PerSpanData* span = pfd->mSpan;
      extraOpportunities = ComputeFrameJustification(span, aState);
      innerOpportunities += pfd->mJustificationInfo.mInnerOpportunities;
    } else {
      if (pfd->mIsTextFrame) {
        innerOpportunities += pfd->mJustificationInfo.mInnerOpportunities;
      }

      if (!aState.mLastParticipant) {
        aState.mFirstParticipant = pfd;
        // It is not an empty ruby base, but we are not assigning gaps
        // to the content for now. Clear the last entered ruby base so
        // that we can correctly set the last exited ruby base.
        aState.mLastEnteredRubyBase = nullptr;
      } else {
        extraOpportunities = AssignInterframeJustificationGaps(pfd, aState);
      }

      aState.mLastParticipant = pfd;
    }

    if (isRubyBase) {
      if (aState.mLastEnteredRubyBase == pfd) {
        // There is no justification participant inside this ruby base.
        // Ignore this ruby base completely and restore the outer ruby
        // base here.
        aState.mLastEnteredRubyBase = outerRubyBase;
      } else {
        aState.mLastExitedRubyBase = pfd;
      }
    }

    if (firstChild) {
      outerOpportunities = extraOpportunities;
      firstChild = false;
    } else {
      innerOpportunities += extraOpportunities;
    }
  }

  return outerOpportunities;
}

void
nsLineLayout::AdvanceAnnotationInlineBounds(PerFrameData* aPFD,
                                            const nsSize& aContainerSize,
                                            nscoord aDeltaICoord,
                                            nscoord aDeltaISize)
{
  nsIFrame* frame = aPFD->mFrame;
  nsIAtom* frameType = frame->GetType();
  MOZ_ASSERT(frameType == nsGkAtoms::rubyTextFrame ||
             frameType == nsGkAtoms::rubyTextContainerFrame);
  MOZ_ASSERT(aPFD->mSpan, "rt and rtc should have span.");

  PerSpanData* psd = aPFD->mSpan;
  WritingMode lineWM = mRootSpan->mWritingMode;
  aPFD->mBounds.IStart(lineWM) += aDeltaICoord;

  // Check whether this expansion should be counted into the reserved
  // isize or not. When it is a ruby text container, and it has some
  // children linked to the base, it must not have reserved isize,
  // or its children won't align with their bases.  Otherwise, this
  // expansion should be reserved.  There are two cases a ruby text
  // container does not have children linked to the base:
  // 1. it is a container for span; 2. its children are collapsed.
  // See bug 1055674 for the second case.
  if (frameType == nsGkAtoms::rubyTextFrame ||
      // This ruby text container is a span.
      (psd->mFirstFrame == psd->mLastFrame && psd->mFirstFrame &&
       !psd->mFirstFrame->mIsLinkedToBase)) {
    // For ruby text frames, only increase frames
    // which are not auto-hidden.
    if (frameType != nsGkAtoms::rubyTextFrame ||
        !static_cast<nsRubyTextFrame*>(frame)->IsAutoHidden()) {
      nscoord reservedISize = RubyUtils::GetReservedISize(frame);
      RubyUtils::SetReservedISize(frame, reservedISize + aDeltaISize);
    }
  } else {
    // It is a normal ruby text container. Its children will expand
    // themselves properly. We only need to expand its own size here.
    aPFD->mBounds.ISize(lineWM) += aDeltaISize;
  }
  aPFD->mFrame->SetRect(lineWM, aPFD->mBounds, aContainerSize);
}

/**
 * This function applies the changes of icoord and isize caused by
 * justification to annotations of the given frame.
 */
void
nsLineLayout::ApplyLineJustificationToAnnotations(PerFrameData* aPFD,
                                                  nscoord aDeltaICoord,
                                                  nscoord aDeltaISize)
{
  PerFrameData* pfd = aPFD->mNextAnnotation;
  while (pfd) {
    nsSize containerSize = pfd->mFrame->GetParent()->GetSize();
    AdvanceAnnotationInlineBounds(pfd, containerSize,
                                  aDeltaICoord, aDeltaISize);

    // There are two cases where an annotation frame has siblings which
    // do not attached to a ruby base-level frame:
    // 1. there's an intra-annotation whitespace which has no intra-base
    //    white-space to pair with;
    // 2. there are not enough ruby bases to be paired with annotations.
    // In these cases, their size should not be affected, but we still
    // need to move them so that they won't overlap other frames.
    PerFrameData* sibling = pfd->mNext;
    while (sibling && !sibling->mIsLinkedToBase) {
      AdvanceAnnotationInlineBounds(sibling, containerSize,
                                    aDeltaICoord + aDeltaISize, 0);
      sibling = sibling->mNext;
    }

    pfd = pfd->mNextAnnotation;
  }
}

nscoord 
nsLineLayout::ApplyFrameJustification(PerSpanData* aPSD,
                                      JustificationApplicationState& aState)
{
  NS_ASSERTION(aPSD, "null arg");

  nscoord deltaICoord = 0;
  for (PerFrameData* pfd = aPSD->mFirstFrame; pfd != nullptr; pfd = pfd->mNext) {
    // Don't reposition bullets (and other frames that occur out of X-order?)
    if (!pfd->mIsBullet) {
      nscoord dw = 0;
      WritingMode lineWM = mRootSpan->mWritingMode;
      const auto& assign = pfd->mJustificationAssignment;
      bool isInlineText = pfd->mIsTextFrame &&
                          !pfd->mWritingMode.IsOrthogonalTo(lineWM);

      if (isInlineText) {
        if (aState.IsJustifiable()) {
          // Set corresponding justification gaps here, so that the
          // text frame knows how it should add gaps at its sides.
          const auto& info = pfd->mJustificationInfo;
          auto textFrame = static_cast<nsTextFrame*>(pfd->mFrame);
          textFrame->AssignJustificationGaps(assign);
          dw = aState.Consume(JustificationUtils::CountGaps(info, assign));
        }

        if (dw) {
          pfd->mRecomputeOverflow = true;
        }
      }
      else {
        if (nullptr != pfd->mSpan) {
          dw = ApplyFrameJustification(pfd->mSpan, aState);
        }
      }

      pfd->mBounds.ISize(lineWM) += dw;
      nscoord gapsAtEnd = 0;
      if (!isInlineText && assign.TotalGaps()) {
        // It is possible that we assign gaps to non-text frame or an
        // orthogonal text frame. Apply the gaps as margin for them.
        deltaICoord += aState.Consume(assign.mGapsAtStart);
        gapsAtEnd = aState.Consume(assign.mGapsAtEnd);
        dw += gapsAtEnd;
      }
      pfd->mBounds.IStart(lineWM) += deltaICoord;

      // The gaps added to the end of the frame should also be
      // excluded from the isize added to the annotation.
      ApplyLineJustificationToAnnotations(pfd, deltaICoord, dw - gapsAtEnd);
      deltaICoord += dw;
      pfd->mFrame->SetRect(lineWM, pfd->mBounds, ContainerSizeForSpan(aPSD));
    }
  }
  return deltaICoord;
}

static nsIFrame*
FindNearestRubyBaseAncestor(nsIFrame* aFrame)
{
  MOZ_ASSERT(aFrame->StyleContext()->ShouldSuppressLineBreak());
  while (aFrame && aFrame->GetType() != nsGkAtoms::rubyBaseFrame) {
    aFrame = aFrame->GetParent();
  }
  // XXX It is possible that no ruby base ancestor is found because of
  // some edge cases like form control or canvas inside ruby text.
  // See bug 1138092 comment 4.
  NS_WARNING_ASSERTION(aFrame, "no ruby base ancestor?");
  return aFrame;
}

/**
 * This method expands the given frame by the given reserved isize.
 */
void
nsLineLayout::ExpandRubyBox(PerFrameData* aFrame, nscoord aReservedISize,
                            const nsSize& aContainerSize)
{
  WritingMode lineWM = mRootSpan->mWritingMode;
  auto rubyAlign = aFrame->mFrame->StyleText()->mRubyAlign;
  switch (rubyAlign) {
    case NS_STYLE_RUBY_ALIGN_START:
      // do nothing for start
      break;
    case NS_STYLE_RUBY_ALIGN_SPACE_BETWEEN:
    case NS_STYLE_RUBY_ALIGN_SPACE_AROUND: {
      int32_t opportunities = aFrame->mJustificationInfo.mInnerOpportunities;
      int32_t gaps = opportunities * 2;
      if (rubyAlign == NS_STYLE_RUBY_ALIGN_SPACE_AROUND) {
        // Each expandable ruby box with ruby-align space-around has a
        // gap at each of its sides. For rb/rbc, see comment in
        // AssignInterframeJustificationGaps; for rt/rtc, see comment
        // in ExpandRubyBoxWithAnnotations.
        gaps += 2;
      }
      if (gaps > 0) {
        JustificationApplicationState state(gaps, aReservedISize);
        ApplyFrameJustification(aFrame->mSpan, state);
        break;
      }
      // If there are no justification opportunities for space-between,
      // fall-through to center per spec.
      MOZ_FALLTHROUGH;
    }
    case NS_STYLE_RUBY_ALIGN_CENTER:
      // Indent all children by half of the reserved inline size.
      for (PerFrameData* child = aFrame->mSpan->mFirstFrame;
           child; child = child->mNext) {
        child->mBounds.IStart(lineWM) += aReservedISize / 2;
        child->mFrame->SetRect(lineWM, child->mBounds, aContainerSize);
      }
      break;
    default:
      MOZ_ASSERT_UNREACHABLE("Unknown ruby-align value");
  }

  aFrame->mBounds.ISize(lineWM) += aReservedISize;
  aFrame->mFrame->SetRect(lineWM, aFrame->mBounds, aContainerSize);
}

/**
 * This method expands the given frame by the reserved inline size.
 * It also expands its annotations if they are expandable and have
 * reserved isize larger than zero.
 */
void
nsLineLayout::ExpandRubyBoxWithAnnotations(PerFrameData* aFrame,
                                           const nsSize& aContainerSize)
{
  nscoord reservedISize = RubyUtils::GetReservedISize(aFrame->mFrame);
  if (reservedISize) {
    ExpandRubyBox(aFrame, reservedISize, aContainerSize);
  }

  WritingMode lineWM = mRootSpan->mWritingMode;
  bool isLevelContainer =
    aFrame->mFrame->GetType() == nsGkAtoms::rubyBaseContainerFrame;
  for (PerFrameData* annotation = aFrame->mNextAnnotation;
       annotation; annotation = annotation->mNextAnnotation) {
    if (isLevelContainer) {
      nsIFrame* rtcFrame = annotation->mFrame;
      MOZ_ASSERT(rtcFrame->GetType() == nsGkAtoms::rubyTextContainerFrame);
      // It is necessary to set the rect again because the container
      // width was unknown, and zero was used instead when we reflow
      // them. The corresponding base containers were repositioned in
      // VerticalAlignFrames and PlaceTopBottomFrames.
      MOZ_ASSERT(
        rtcFrame->GetLogicalSize(lineWM) == annotation->mBounds.Size(lineWM));
      rtcFrame->SetPosition(lineWM, annotation->mBounds.Origin(lineWM),
                            aContainerSize);
    }

    nscoord reservedISize = RubyUtils::GetReservedISize(annotation->mFrame);
    if (!reservedISize) {
      continue;
    }

    MOZ_ASSERT(annotation->mSpan);
    JustificationComputationState computeState;
    ComputeFrameJustification(annotation->mSpan, computeState);
    if (!computeState.mFirstParticipant) {
      continue;
    }
    if (IsRubyAlignSpaceAround(annotation->mFrame)) {
      // Add one gap at each side of this annotation.
      computeState.mFirstParticipant->mJustificationAssignment.mGapsAtStart = 1;
      computeState.mLastParticipant->mJustificationAssignment.mGapsAtEnd = 1;
    }
    nsIFrame* parentFrame = annotation->mFrame->GetParent();
    nsSize containerSize = parentFrame->GetSize();
    MOZ_ASSERT(containerSize == aContainerSize ||
               parentFrame->GetType() == nsGkAtoms::rubyTextContainerFrame,
               "Container width should only be different when the current "
               "annotation is a ruby text frame, whose parent is not same "
               "as its base frame.");
    ExpandRubyBox(annotation, reservedISize, containerSize);
    ExpandInlineRubyBoxes(annotation->mSpan);
  }
}

/**
 * This method looks for all expandable ruby box in the given span, and
 * calls ExpandRubyBox to expand them in depth-first preorder.
 */
void
nsLineLayout::ExpandInlineRubyBoxes(PerSpanData* aSpan)
{
  nsSize containerSize = ContainerSizeForSpan(aSpan);
  for (PerFrameData* pfd = aSpan->mFirstFrame; pfd; pfd = pfd->mNext) {
    if (RubyUtils::IsExpandableRubyBox(pfd->mFrame)) {
      ExpandRubyBoxWithAnnotations(pfd, containerSize);
    }
    if (pfd->mSpan) {
      ExpandInlineRubyBoxes(pfd->mSpan);
    }
  }
}

// Align inline frames within the line according to the CSS text-align
// property.
void
nsLineLayout::TextAlignLine(nsLineBox* aLine,
                            bool aIsLastLine)
{
  /**
   * NOTE: aIsLastLine ain't necessarily so: it is correctly set by caller
   * only in cases where the last line needs special handling.
   */
  PerSpanData* psd = mRootSpan;
  WritingMode lineWM = psd->mWritingMode;
  LAYOUT_WARN_IF_FALSE(psd->mIEnd != NS_UNCONSTRAINEDSIZE,
                       "have unconstrained width; this should only result from "
                       "very large sizes, not attempts at intrinsic width "
                       "calculation");
  nscoord availISize = psd->mIEnd - psd->mIStart;
  nscoord remainingISize = availISize - aLine->ISize();
#ifdef NOISY_INLINEDIR_ALIGN
  nsFrame::ListTag(stdout, mBlockReflowInput->mFrame);
  printf(": availISize=%d lineBounds.IStart=%d lineISize=%d delta=%d\n",
         availISize, aLine->IStart(), aLine->ISize(), remainingISize);
#endif

  // 'text-align-last: auto' is equivalent to the value of the 'text-align'
  // property except when 'text-align' is set to 'justify', in which case it
  // is 'justify' when 'text-justify' is 'distribute' and 'start' otherwise.
  //
  // XXX: the code below will have to change when we implement text-justify
  //
  nscoord dx = 0;
  uint8_t textAlign = mStyleText->mTextAlign;
  bool textAlignTrue = mStyleText->mTextAlignTrue;
  if (aIsLastLine) {
    textAlignTrue = mStyleText->mTextAlignLastTrue;
    if (mStyleText->mTextAlignLast == NS_STYLE_TEXT_ALIGN_AUTO) {
      if (textAlign == NS_STYLE_TEXT_ALIGN_JUSTIFY) {
        textAlign = NS_STYLE_TEXT_ALIGN_START;
      }
    } else {
      textAlign = mStyleText->mTextAlignLast;
    }
  }

  bool isSVG = mBlockReflowInput->mFrame->IsSVGText();
  bool doTextAlign = remainingISize > 0 || textAlignTrue;

  int32_t additionalGaps = 0;
  if (!isSVG && (mHasRuby || (doTextAlign &&
                              textAlign == NS_STYLE_TEXT_ALIGN_JUSTIFY))) {
    JustificationComputationState computeState;
    ComputeFrameJustification(psd, computeState);
    if (mHasRuby && computeState.mFirstParticipant) {
      PerFrameData* firstFrame = computeState.mFirstParticipant;
      if (firstFrame->mFrame->StyleContext()->ShouldSuppressLineBreak()) {
        MOZ_ASSERT(!firstFrame->mJustificationAssignment.mGapsAtStart);
        nsIFrame* rubyBase = FindNearestRubyBaseAncestor(firstFrame->mFrame);
        if (rubyBase && IsRubyAlignSpaceAround(rubyBase)) {
          firstFrame->mJustificationAssignment.mGapsAtStart = 1;
          additionalGaps++;
        }
      }
      PerFrameData* lastFrame = computeState.mLastParticipant;
      if (lastFrame->mFrame->StyleContext()->ShouldSuppressLineBreak()) {
        MOZ_ASSERT(!lastFrame->mJustificationAssignment.mGapsAtEnd);
        nsIFrame* rubyBase = FindNearestRubyBaseAncestor(lastFrame->mFrame);
        if (rubyBase && IsRubyAlignSpaceAround(rubyBase)) {
          lastFrame->mJustificationAssignment.mGapsAtEnd = 1;
          additionalGaps++;
        }
      }
    }
  }

  if (!isSVG && doTextAlign) {
    switch (textAlign) {
      case NS_STYLE_TEXT_ALIGN_JUSTIFY: {
        int32_t opportunities =
          psd->mFrame->mJustificationInfo.mInnerOpportunities;
        if (opportunities > 0) {
          int32_t gaps = opportunities * 2 + additionalGaps;
          JustificationApplicationState applyState(gaps, remainingISize);

          // Apply the justification, and make sure to update our linebox
          // width to account for it.
          aLine->ExpandBy(ApplyFrameJustification(psd, applyState),
                          ContainerSizeForSpan(psd));

          MOZ_ASSERT(applyState.mGaps.mHandled == applyState.mGaps.mCount,
                     "Unprocessed justification gaps");
          MOZ_ASSERT(applyState.mWidth.mConsumed == applyState.mWidth.mAvailable,
                     "Unprocessed justification width");
          break;
        }
        // Fall through to the default case if we could not justify to fill
        // the space.
        MOZ_FALLTHROUGH;
      }

      case NS_STYLE_TEXT_ALIGN_START:
        // default alignment is to start edge so do nothing
        break;

      case NS_STYLE_TEXT_ALIGN_LEFT:
      case NS_STYLE_TEXT_ALIGN_MOZ_LEFT:
        if (!lineWM.IsBidiLTR()) {
          dx = remainingISize;
        }
        break;

      case NS_STYLE_TEXT_ALIGN_RIGHT:
      case NS_STYLE_TEXT_ALIGN_MOZ_RIGHT:
        if (lineWM.IsBidiLTR()) {
          dx = remainingISize;
        }
        break;

      case NS_STYLE_TEXT_ALIGN_END:
        dx = remainingISize;
        break;

      case NS_STYLE_TEXT_ALIGN_CENTER:
      case NS_STYLE_TEXT_ALIGN_MOZ_CENTER:
        dx = remainingISize / 2;
        break;
    }
  }

  if (mHasRuby) {
    ExpandInlineRubyBoxes(mRootSpan);
  }

  if (mPresContext->BidiEnabled() &&
      (!mPresContext->IsVisualMode() || !lineWM.IsBidiLTR())) {
    nsBidiPresUtils::ReorderFrames(psd->mFirstFrame->mFrame,
                                   aLine->GetChildCount(),
                                   lineWM, mContainerSize,
                                   psd->mIStart + mTextIndent + dx);
    if (dx) {
      aLine->IndentBy(dx, ContainerSize());
    }
  } else if (dx) {
    for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
      pfd->mBounds.IStart(lineWM) += dx;
      pfd->mFrame->SetRect(lineWM, pfd->mBounds, ContainerSizeForSpan(psd));
    }
    aLine->IndentBy(dx, ContainerSize());
  }
}

// This method applies any relative positioning to the given frame.
void
nsLineLayout::ApplyRelativePositioning(PerFrameData* aPFD)
{
  if (!aPFD->mRelativePos) {
    return;
  }

  nsIFrame* frame = aPFD->mFrame;
  WritingMode frameWM = aPFD->mWritingMode;
  LogicalPoint origin = frame->GetLogicalPosition(ContainerSize());
  // right and bottom are handled by
  // ReflowInput::ComputeRelativeOffsets
  ReflowInput::ApplyRelativePositioning(frame, frameWM,
                                              aPFD->mOffsets, &origin,
                                              ContainerSize());
  frame->SetPosition(frameWM, origin, ContainerSize());
}

// This method do relative positioning for ruby annotations.
void
nsLineLayout::RelativePositionAnnotations(PerSpanData* aRubyPSD,
                                          nsOverflowAreas& aOverflowAreas)
{
  MOZ_ASSERT(aRubyPSD->mFrame->mFrame->GetType() == nsGkAtoms::rubyFrame);
  for (PerFrameData* pfd = aRubyPSD->mFirstFrame; pfd; pfd = pfd->mNext) {
    MOZ_ASSERT(pfd->mFrame->GetType() == nsGkAtoms::rubyBaseContainerFrame);
    for (PerFrameData* rtc = pfd->mNextAnnotation;
         rtc; rtc = rtc->mNextAnnotation) {
      nsIFrame* rtcFrame = rtc->mFrame;
      MOZ_ASSERT(rtcFrame->GetType() == nsGkAtoms::rubyTextContainerFrame);
      ApplyRelativePositioning(rtc);
      nsOverflowAreas rtcOverflowAreas;
      RelativePositionFrames(rtc->mSpan, rtcOverflowAreas);
      aOverflowAreas.UnionWith(rtcOverflowAreas + rtcFrame->GetPosition());
    }
  }
}

void
nsLineLayout::RelativePositionFrames(PerSpanData* psd, nsOverflowAreas& aOverflowAreas)
{
  nsOverflowAreas overflowAreas;
  WritingMode wm = psd->mWritingMode;
  if (psd != mRootSpan) {
    // The span's overflow areas come in three parts:
    // -- this frame's width and height
    // -- pfd->mOverflowAreas, which is the area of a bullet or the union
    // of a relatively positioned frame's absolute children
    // -- the bounds of all inline descendants
    // The former two parts are computed right here, we gather the descendants
    // below.
    // At this point psd->mFrame->mBounds might be out of date since
    // bidi reordering can move and resize the frames. So use the frame's
    // rect instead of mBounds.
    nsRect adjustedBounds(nsPoint(0, 0), psd->mFrame->mFrame->GetSize());

    overflowAreas.ScrollableOverflow().UnionRect(
      psd->mFrame->mOverflowAreas.ScrollableOverflow(), adjustedBounds);
    overflowAreas.VisualOverflow().UnionRect(
      psd->mFrame->mOverflowAreas.VisualOverflow(), adjustedBounds);
  }
  else {
    LogicalRect rect(wm, psd->mIStart, mBStartEdge,
                     psd->mICoord - psd->mIStart, mFinalLineBSize);
    // The minimum combined area for the frames that are direct
    // children of the block starts at the upper left corner of the
    // line and is sized to match the size of the line's bounding box
    // (the same size as the values returned from VerticalAlignFrames)
    overflowAreas.VisualOverflow() = rect.GetPhysicalRect(wm, ContainerSize());
    overflowAreas.ScrollableOverflow() = overflowAreas.VisualOverflow();
  }

  for (PerFrameData* pfd = psd->mFirstFrame; pfd; pfd = pfd->mNext) {
    nsIFrame* frame = pfd->mFrame;

    // Adjust the origin of the frame
    ApplyRelativePositioning(pfd);

    // We must position the view correctly before positioning its
    // descendants so that widgets are positioned properly (since only
    // some views have widgets).
    if (frame->HasView())
      nsContainerFrame::SyncFrameViewAfterReflow(mPresContext, frame,
        frame->GetView(), pfd->mOverflowAreas.VisualOverflow(),
        NS_FRAME_NO_SIZE_VIEW);

    // Note: the combined area of a child is in its coordinate
    // system. We adjust the childs combined area into our coordinate
    // system before computing the aggregated value by adding in
    // <b>x</b> and <b>y</b> which were computed above.
    nsOverflowAreas r;
    if (pfd->mSpan) {
      // Compute a new combined area for the child span before
      // aggregating it into our combined area.
      RelativePositionFrames(pfd->mSpan, r);
    } else {
      r = pfd->mOverflowAreas;
      if (pfd->mIsTextFrame) {
        // We need to recompute overflow areas in four cases:
        // (1) When PFD_RECOMPUTEOVERFLOW is set due to trimming
        // (2) When there are text decorations, since we can't recompute the
        //     overflow area until Reflow and VerticalAlignLine have finished
        // (3) When there are text emphasis marks, since the marks may be
        //     put further away if the text is inside ruby.
        // (4) When there are text strokes
        if (pfd->mRecomputeOverflow ||
            frame->StyleContext()->HasTextDecorationLines() ||
            frame->StyleText()->HasTextEmphasis() ||
            frame->StyleText()->HasWebkitTextStroke()) {
          nsTextFrame* f = static_cast<nsTextFrame*>(frame);
          r = f->RecomputeOverflow(mBlockReflowInput->mFrame);
        }
        frame->FinishAndStoreOverflow(r, frame->GetSize());
      }

      // If we have something that's not an inline but with a complex frame
      // hierarchy inside that contains views, they need to be
      // positioned.
      // All descendant views must be repositioned even if this frame
      // does have a view in case this frame's view does not have a
      // widget and some of the descendant views do have widgets --
      // otherwise the widgets won't be repositioned.
      nsContainerFrame::PositionChildViews(frame);
    }

    // Do this here (rather than along with setting the overflow rect
    // below) so we get leaf frames as well.  No need to worry
    // about the root span, since it doesn't have a frame.
    if (frame->HasView())
      nsContainerFrame::SyncFrameViewAfterReflow(mPresContext, frame,
                                                 frame->GetView(),
                                                 r.VisualOverflow(),
                                                 NS_FRAME_NO_MOVE_VIEW);

    overflowAreas.UnionWith(r + frame->GetPosition());
  }

  // Also compute relative position in the annotations.
  if (psd->mFrame->mFrame->GetType() == nsGkAtoms::rubyFrame) {
    RelativePositionAnnotations(psd, overflowAreas);
  }

  // If we just computed a spans combined area, we need to update its
  // overflow rect...
  if (psd != mRootSpan) {
    PerFrameData* spanPFD = psd->mFrame;
    nsIFrame* frame = spanPFD->mFrame;
    frame->FinishAndStoreOverflow(overflowAreas, frame->GetSize());
  }
  aOverflowAreas = overflowAreas;
}