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.

Mercurial (3865bf230c49)

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
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla MathML Project.
 *
 * The Initial Developer of the Original Code is
 * The University Of Queensland.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Roger B. Sidje <rbs@maths.uq.edu.au>
 *   David J. Fiddes <D.J.Fiddes@hw.ac.uk>
 *   Vilya Harvey <vilya@nag.co.uk>
 *   Shyjan Mahamud <mahamud@cs.cmu.edu>
 *   Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
 *   Frederic Wang <fred.wang@free.fr> - extension of <msqrt/> to <menclose/>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */


#include "nsCOMPtr.h"
#include "nsFrame.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
#include "nsStyleConsts.h"
#include "nsIRenderingContext.h"
#include "nsIFontMetrics.h"
#include "nsWhitespaceTokenizer.h"

#include "nsMathMLmencloseFrame.h"
#include "nsDisplayList.h"
#include "gfxContext.h"

//
// <menclose> -- enclose content with a stretching symbol such
// as a long division sign. - implementation

// longdiv:
// Unicode 5.1 assigns U+27CC to LONG DIVISION, but a right parenthesis
// renders better with current font support.
static const PRUnichar kLongDivChar = ')';

// radical: 'SQUARE ROOT'
static const PRUnichar kRadicalChar = 0x221A;

nsIFrame*
NS_NewMathMLmencloseFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
  return new (aPresShell) nsMathMLmencloseFrame(aContext);
}

NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmencloseFrame)

nsMathMLmencloseFrame::nsMathMLmencloseFrame(nsStyleContext* aContext) :
  nsMathMLContainerFrame(aContext), mNotationsToDraw(0),
  mLongDivCharIndex(-1), mRadicalCharIndex(-1), mContentWidth(0)
{
}

nsMathMLmencloseFrame::~nsMathMLmencloseFrame()
{
}

nsresult nsMathMLmencloseFrame::AllocateMathMLChar(nsMencloseNotation mask)
{
  // Is the char already allocated?
  if ((mask == NOTATION_LONGDIV && mLongDivCharIndex >= 0) ||
      (mask == NOTATION_RADICAL && mRadicalCharIndex >= 0))
    return NS_OK;

  // No need to track the style context given to our MathML chars.
  // The Style System will use Get/SetAdditionalStyleContext() to keep it
  // up-to-date if dynamic changes arise.
  PRUint32 i = mMathMLChar.Length();
  nsAutoString Char;

  if (!mMathMLChar.AppendElement())
    return NS_ERROR_OUT_OF_MEMORY;

  if (mask == NOTATION_LONGDIV) {
    Char.Assign(kLongDivChar);
    mLongDivCharIndex = i;
  } else if (mask == NOTATION_RADICAL) {
    Char.Assign(kRadicalChar);
    mRadicalCharIndex = i;
  }

  nsPresContext *presContext = PresContext();
  mMathMLChar[i].SetData(presContext, Char);
  ResolveMathMLCharStyle(presContext, mContent, mStyleContext,
                         &mMathMLChar[i],
                         PR_TRUE);

  return NS_OK;
}

/*
 * Add a notation to draw, if the argument is the name of a known notation.
 * @param aNotation string name of a notation
 */
nsresult nsMathMLmencloseFrame::AddNotation(const nsAString& aNotation)
{
  nsresult rv;

  if (aNotation.EqualsLiteral("longdiv")) {
    rv = AllocateMathMLChar(NOTATION_LONGDIV);
    NS_ENSURE_SUCCESS(rv, rv);
    mNotationsToDraw |= NOTATION_LONGDIV;
  } else if (aNotation.EqualsLiteral("actuarial")) {
    mNotationsToDraw |= (NOTATION_RIGHT | NOTATION_TOP);
  } else if (aNotation.EqualsLiteral("radical")) {
    rv = AllocateMathMLChar(NOTATION_RADICAL);
    NS_ENSURE_SUCCESS(rv, rv);
    mNotationsToDraw |= NOTATION_RADICAL;
  } else if (aNotation.EqualsLiteral("box")) {
    mNotationsToDraw |= (NOTATION_LEFT | NOTATION_RIGHT |
                         NOTATION_TOP | NOTATION_BOTTOM);
  } else if (aNotation.EqualsLiteral("roundedbox")) {
    mNotationsToDraw |= NOTATION_ROUNDEDBOX;
  } else if (aNotation.EqualsLiteral("circle")) {
    mNotationsToDraw |= NOTATION_CIRCLE;
  } else if (aNotation.EqualsLiteral("left")) {
    mNotationsToDraw |= NOTATION_LEFT;
  } else if (aNotation.EqualsLiteral("right")) {
    mNotationsToDraw |= NOTATION_RIGHT;
  } else if (aNotation.EqualsLiteral("top")) {
    mNotationsToDraw |= NOTATION_TOP;
  } else if (aNotation.EqualsLiteral("bottom")) {
    mNotationsToDraw |= NOTATION_BOTTOM;
  } else if (aNotation.EqualsLiteral("updiagonalstrike")) {
    mNotationsToDraw |= NOTATION_UPDIAGONALSTRIKE;
  } else if (aNotation.EqualsLiteral("downdiagonalstrike")) {
    mNotationsToDraw |= NOTATION_DOWNDIAGONALSTRIKE;
  } else if (aNotation.EqualsLiteral("verticalstrike")) {
    mNotationsToDraw |= NOTATION_VERTICALSTRIKE;
  } else if (aNotation.EqualsLiteral("horizontalstrike")) {
    mNotationsToDraw |= NOTATION_HORIZONTALSTRIKE;
  }

  return NS_OK;
}

/*
 * Initialize the list of notations to draw
 */
void nsMathMLmencloseFrame::InitNotations()
{
  nsAutoString value;

  if (mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::notation_, value)) {
    // parse the notation attribute
    nsWhitespaceTokenizer tokenizer(value);

    while (tokenizer.hasMoreTokens())
      AddNotation(tokenizer.nextToken());
  } else {
    // default: longdiv
    if (NS_FAILED(AllocateMathMLChar(NOTATION_LONGDIV)))
      return;
    mNotationsToDraw = NOTATION_LONGDIV;
  }
}

NS_IMETHODIMP
nsMathMLmencloseFrame::Init(nsIContent*      aContent,
                            nsIFrame*        aParent,
                            nsIFrame*        aPrevInFlow)
{
  nsresult rv = nsMathMLContainerFrame::Init(aContent, aParent, aPrevInFlow);
  NS_ENSURE_SUCCESS(rv, rv);

  InitNotations();

  return NS_OK;
}

NS_IMETHODIMP
nsMathMLmencloseFrame::InheritAutomaticData(nsIFrame* aParent)
{
  // let the base class get the default from our parent
  nsMathMLContainerFrame::InheritAutomaticData(aParent);

  mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;

  return NS_OK;
}

NS_IMETHODIMP
nsMathMLmencloseFrame::TransmitAutomaticData()
{
  if (IsToDraw(NOTATION_RADICAL)) {
    // The TeXBook (Ch 17. p.141) says that \sqrt is cramped 
    UpdatePresentationDataFromChildAt(0, -1,
                                      NS_MATHML_COMPRESSED,
                                      NS_MATHML_COMPRESSED);
  }

  return NS_OK;
}

NS_IMETHODIMP
nsMathMLmencloseFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                        const nsRect&           aDirtyRect,
                                        const nsDisplayListSet& aLists)
{
  /////////////
  // paint the menclosed content
  nsresult rv = nsMathMLContainerFrame::BuildDisplayList(aBuilder, aDirtyRect,
                                                         aLists);

  NS_ENSURE_SUCCESS(rv, rv);

  if (NS_MATHML_HAS_ERROR(mPresentationData.flags))
    return rv;

  nsRect mencloseRect = nsIFrame::GetRect();
  mencloseRect.x = mencloseRect.y = 0;

  if (IsToDraw(NOTATION_RADICAL)) {
    rv = mMathMLChar[mRadicalCharIndex].Display(aBuilder, this, aLists);
    NS_ENSURE_SUCCESS(rv, rv);

    nsRect rect;
    mMathMLChar[mRadicalCharIndex].GetRect(rect);
    rect.MoveBy(rect.width, 0);
    rect.SizeTo(mContentWidth, mRuleThickness);
    rv = DisplayBar(aBuilder, this, rect, aLists);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (IsToDraw(NOTATION_LONGDIV)) {
    rv = mMathMLChar[mLongDivCharIndex].Display(aBuilder, this, aLists);
    NS_ENSURE_SUCCESS(rv, rv);

    nsRect rect;
    mMathMLChar[mLongDivCharIndex].GetRect(rect);
    rect.SizeTo(rect.width + mContentWidth, mRuleThickness);
    rv = DisplayBar(aBuilder, this, rect, aLists);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (IsToDraw(NOTATION_TOP)) {
    nsRect rect(0, 0, mencloseRect.width, mRuleThickness);
    rv = DisplayBar(aBuilder, this, rect, aLists);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (IsToDraw(NOTATION_BOTTOM)) {
    nsRect rect(0, mencloseRect.height - mRuleThickness,
                mencloseRect.width, mRuleThickness);
    rv = DisplayBar(aBuilder, this, rect, aLists);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (IsToDraw(NOTATION_LEFT)) {
    nsRect rect(0, 0, mRuleThickness, mencloseRect.height);
    rv = DisplayBar(aBuilder, this, rect, aLists);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (IsToDraw(NOTATION_RIGHT)) {
    nsRect rect(mencloseRect.width - mRuleThickness, 0,
                mRuleThickness, mencloseRect.height);
    rv = DisplayBar(aBuilder, this, rect, aLists);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (IsToDraw(NOTATION_ROUNDEDBOX)) {
    rv = DisplayNotation(aBuilder, this, mencloseRect, aLists,
                         mRuleThickness, NOTATION_ROUNDEDBOX);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (IsToDraw(NOTATION_CIRCLE)) {
    rv = DisplayNotation(aBuilder, this, mencloseRect, aLists,
                         mRuleThickness, NOTATION_CIRCLE);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (IsToDraw(NOTATION_UPDIAGONALSTRIKE)) {
    rv = DisplayNotation(aBuilder, this, mencloseRect, aLists,
                         mRuleThickness, NOTATION_UPDIAGONALSTRIKE);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (IsToDraw(NOTATION_DOWNDIAGONALSTRIKE)) {
    rv = DisplayNotation(aBuilder, this, mencloseRect, aLists,
                         mRuleThickness, NOTATION_DOWNDIAGONALSTRIKE);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (IsToDraw(NOTATION_HORIZONTALSTRIKE)) {
    nsRect rect(0, mencloseRect.height / 2 - mRuleThickness / 2,
                mencloseRect.width, mRuleThickness);
    rv = DisplayBar(aBuilder, this, rect, aLists);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (IsToDraw(NOTATION_VERTICALSTRIKE)) {
    nsRect rect(mencloseRect.width / 2 - mRuleThickness / 2, 0,
                mRuleThickness, mencloseRect.height);
    rv = DisplayBar(aBuilder, this, rect, aLists);
    NS_ENSURE_SUCCESS(rv, rv);
  }
  return rv;
}

/* virtual */ nsresult
nsMathMLmencloseFrame::MeasureForWidth(nsIRenderingContext& aRenderingContext,
                                       nsHTMLReflowMetrics& aDesiredSize)
{
  return PlaceInternal(aRenderingContext, PR_FALSE, aDesiredSize, PR_TRUE);
}

/* virtual */ nsresult
nsMathMLmencloseFrame::Place(nsIRenderingContext& aRenderingContext,
                             PRBool               aPlaceOrigin,
                             nsHTMLReflowMetrics& aDesiredSize)
{
  return PlaceInternal(aRenderingContext, aPlaceOrigin, aDesiredSize, PR_FALSE);
}

/* virtual */ nsresult
nsMathMLmencloseFrame::PlaceInternal(nsIRenderingContext& aRenderingContext,
                                     PRBool               aPlaceOrigin,
                                     nsHTMLReflowMetrics& aDesiredSize,
                                     PRBool               aWidthOnly)
{
  ///////////////
  // Measure the size of our content using the base class to format like an
  // inferred mrow.
  nsHTMLReflowMetrics baseSize;
  nsresult rv =
    nsMathMLContainerFrame::Place(aRenderingContext, PR_FALSE, baseSize);

  if (NS_MATHML_HAS_ERROR(mPresentationData.flags) || NS_FAILED(rv)) {
      DidReflowChildren(GetFirstChild(nsnull));
      return rv;
    }

  nsBoundingMetrics bmBase = baseSize.mBoundingMetrics;
  nscoord dx_left = 0, dx_right = 0;
  nsBoundingMetrics bmLongdivChar, bmRadicalChar;
  nscoord radicalAscent = 0, radicalDescent = 0;
  nscoord longdivAscent = 0, longdivDescent = 0;
  nscoord psi = 0;

  ///////////////
  // Thickness of bars and font metrics
  nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
  nsCOMPtr<nsIFontMetrics> fm;
  nscoord mEmHeight;
  aRenderingContext.SetFont(GetStyleFont()->mFont, nsnull,
                            PresContext()->GetUserFontSet());
  aRenderingContext.GetFontMetrics(*getter_AddRefs(fm));
  GetRuleThickness(aRenderingContext, fm, mRuleThickness);
  GetEmHeight(fm, mEmHeight);

  nsBoundingMetrics bmOne;
  aRenderingContext.GetBoundingMetrics(NS_LITERAL_STRING("1").get(), 1, bmOne);

  ///////////////
  // General rules: the menclose element takes the size of the enclosed content.
  // We add a padding when needed.

  // determine padding & psi
  nscoord padding = 3 * mRuleThickness;
  nscoord delta = padding % onePixel;
  if (delta)
    padding += onePixel - delta; // round up

  if (IsToDraw(NOTATION_LONGDIV) || IsToDraw(NOTATION_RADICAL)) {
      nscoord phi;
      // Rule 11, App. G, TeXbook
      // psi = clearance between rule and content
      if (NS_MATHML_IS_DISPLAYSTYLE(mPresentationData.flags))
        fm->GetXHeight(phi);
      else
        phi = mRuleThickness;
      psi = mRuleThickness + phi / 4;

      delta = psi % onePixel;
      if (delta)
        psi += onePixel - delta; // round up
    }

  if (mRuleThickness < onePixel)
    mRuleThickness = onePixel;
 
  // Set horizontal parameters
  if (IsToDraw(NOTATION_ROUNDEDBOX) ||
      IsToDraw(NOTATION_TOP) ||
      IsToDraw(NOTATION_LEFT) ||
      IsToDraw(NOTATION_BOTTOM) ||
      IsToDraw(NOTATION_CIRCLE))
    dx_left = padding;

  if (IsToDraw(NOTATION_ROUNDEDBOX) ||
      IsToDraw(NOTATION_TOP) ||
      IsToDraw(NOTATION_RIGHT) ||
      IsToDraw(NOTATION_BOTTOM) ||
      IsToDraw(NOTATION_CIRCLE))
    dx_right = padding;

  // Set vertical parameters
  if (IsToDraw(NOTATION_RIGHT) ||
      IsToDraw(NOTATION_LEFT) ||
      IsToDraw(NOTATION_UPDIAGONALSTRIKE) ||
      IsToDraw(NOTATION_DOWNDIAGONALSTRIKE) ||
      IsToDraw(NOTATION_VERTICALSTRIKE) ||
      IsToDraw(NOTATION_CIRCLE) ||
      IsToDraw(NOTATION_ROUNDEDBOX) ||
      IsToDraw(NOTATION_RADICAL) ||
      IsToDraw(NOTATION_LONGDIV)) {
      // set a minimal value for the base height
      bmBase.ascent = NS_MAX(bmOne.ascent, bmBase.ascent);
      bmBase.descent = NS_MAX(0, bmBase.descent);
  }

  mBoundingMetrics.ascent = bmBase.ascent;
  mBoundingMetrics.descent = bmBase.descent;
    
  if (IsToDraw(NOTATION_ROUNDEDBOX) ||
      IsToDraw(NOTATION_TOP) ||
      IsToDraw(NOTATION_LEFT) ||
      IsToDraw(NOTATION_RIGHT) ||
      IsToDraw(NOTATION_CIRCLE))
    mBoundingMetrics.ascent += padding;
  
  if (IsToDraw(NOTATION_ROUNDEDBOX) ||
      IsToDraw(NOTATION_LEFT) ||
      IsToDraw(NOTATION_RIGHT) ||
      IsToDraw(NOTATION_BOTTOM) ||
      IsToDraw(NOTATION_CIRCLE))
    mBoundingMetrics.descent += padding;

  ///////////////
  // circle notation: we don't want the ellipse to overlap the enclosed
  // content. Hence, we need to increase the size of the bounding box by a
  // factor of at least sqrt(2).
  if (IsToDraw(NOTATION_CIRCLE)) {
    double ratio = (sqrt(2.0) - 1.0) / 2.0;
    nscoord padding2;

    // Update horizontal parameters
    padding2 = ratio * bmBase.width;

    dx_left = NS_MAX(dx_left, padding2);
    dx_right = NS_MAX(dx_right, padding2);

    // Update vertical parameters
    padding2 = ratio * (bmBase.ascent + bmBase.descent);

    mBoundingMetrics.ascent = NS_MAX(mBoundingMetrics.ascent,
                                     bmBase.ascent + padding2);
    mBoundingMetrics.descent = NS_MAX(mBoundingMetrics.descent,
                                      bmBase.descent + padding2);
  }

  ///////////////
  // longdiv notation:
  if (IsToDraw(NOTATION_LONGDIV)) {
    if (aWidthOnly) {
        nscoord longdiv_width = mMathMLChar[mLongDivCharIndex].
          GetMaxWidth(PresContext(), aRenderingContext);

        // Update horizontal parameters
        dx_left = NS_MAX(dx_left, longdiv_width);
    } else {
      // Stretch the parenthesis to the appropriate height if it is not
      // big enough.
      nsBoundingMetrics contSize = bmBase;
      contSize.ascent = mRuleThickness;
      contSize.descent = bmBase.ascent + bmBase.descent + psi;

      // height(longdiv) should be >= height(base) + psi + mRuleThickness
      mMathMLChar[mLongDivCharIndex].Stretch(PresContext(), aRenderingContext,
                                             NS_STRETCH_DIRECTION_VERTICAL,
                                             contSize, bmLongdivChar,
                                             NS_STRETCH_LARGER);
      mMathMLChar[mLongDivCharIndex].GetBoundingMetrics(bmLongdivChar);

      // Update horizontal parameters
      dx_left = NS_MAX(dx_left, bmLongdivChar.width);

      // Update vertical parameters
      longdivAscent = bmBase.ascent + psi + mRuleThickness;
      longdivDescent = NS_MAX(bmBase.descent,
                              (bmLongdivChar.ascent + bmLongdivChar.descent -
                               longdivAscent));

      mBoundingMetrics.ascent = NS_MAX(mBoundingMetrics.ascent,
                                       longdivAscent);
      mBoundingMetrics.descent = NS_MAX(mBoundingMetrics.descent,
                                        longdivDescent);
    }
  }

  ///////////////
  // radical notation:
  if (IsToDraw(NOTATION_RADICAL)) {
    if (aWidthOnly) {
      nscoord radical_width = mMathMLChar[mRadicalCharIndex].
        GetMaxWidth(PresContext(), aRenderingContext);
      
      // Update horizontal parameters
      dx_left = NS_MAX(dx_left, radical_width);
    } else {
      // Stretch the radical symbol to the appropriate height if it is not
      // big enough.
      nsBoundingMetrics contSize = bmBase;
      contSize.ascent = mRuleThickness;
      contSize.descent = bmBase.ascent + bmBase.descent + psi;

      // height(radical) should be >= height(base) + psi + mRuleThickness
      mMathMLChar[mRadicalCharIndex].Stretch(PresContext(), aRenderingContext,
                                             NS_STRETCH_DIRECTION_VERTICAL,
                                             contSize, bmRadicalChar,
                                             NS_STRETCH_LARGER);
      mMathMLChar[mRadicalCharIndex].GetBoundingMetrics(bmRadicalChar);

      // Update horizontal parameters
      dx_left = NS_MAX(dx_left, bmRadicalChar.width);

      // Update vertical parameters
      radicalAscent = bmBase.ascent + psi + mRuleThickness;
      radicalDescent = NS_MAX(bmBase.descent,
                              (bmRadicalChar.ascent + bmRadicalChar.descent -
                               radicalAscent));

      mBoundingMetrics.ascent = NS_MAX(mBoundingMetrics.ascent,
                                       radicalAscent);
      mBoundingMetrics.descent = NS_MAX(mBoundingMetrics.descent,
                                        radicalDescent);
    }
  }

  ///////////////
  //
  if (IsToDraw(NOTATION_CIRCLE) ||
      IsToDraw(NOTATION_ROUNDEDBOX) ||
      (IsToDraw(NOTATION_LEFT) && IsToDraw(NOTATION_RIGHT))) {
    // center the menclose around the content (horizontally)
    dx_left = dx_right = NS_MAX(dx_left, dx_right);
  }

  ///////////////
  // The maximum size is now computed: set the remaining parameters
  mBoundingMetrics.width = dx_left + bmBase.width + dx_right;

  mBoundingMetrics.leftBearing = NS_MIN(0, dx_left + bmBase.leftBearing);
  mBoundingMetrics.rightBearing =
    NS_MAX(mBoundingMetrics.width, dx_left + bmBase.rightBearing);
  
  aDesiredSize.width = mBoundingMetrics.width;

  aDesiredSize.ascent = NS_MAX(mBoundingMetrics.ascent, baseSize.ascent);
  aDesiredSize.height = aDesiredSize.ascent +
    NS_MAX(mBoundingMetrics.descent, baseSize.height - baseSize.ascent);

  if (IsToDraw(NOTATION_LONGDIV) || IsToDraw(NOTATION_RADICAL)) {
    // get the leading to be left at the top of the resulting frame
    // this seems more reliable than using fm->GetLeading() on suspicious
    // fonts
    nscoord leading = nscoord(0.2f * mEmHeight);
    nscoord desiredSizeAscent = aDesiredSize.ascent;
    nscoord desiredSizeDescent = aDesiredSize.height - aDesiredSize.ascent;
    
    if (IsToDraw(NOTATION_LONGDIV)) {
      desiredSizeAscent = NS_MAX(desiredSizeAscent,
                                 longdivAscent + leading);
      desiredSizeDescent = NS_MAX(desiredSizeDescent,
                                  longdivDescent + mRuleThickness);
    }
    
    if (IsToDraw(NOTATION_RADICAL)) {
      desiredSizeAscent = NS_MAX(desiredSizeAscent,
                                 radicalAscent + leading);
      desiredSizeDescent = NS_MAX(desiredSizeDescent,
                                  radicalDescent + mRuleThickness);
    }

    aDesiredSize.ascent = desiredSizeAscent;
    aDesiredSize.height = desiredSizeAscent + desiredSizeDescent;
  }
    
  if (IsToDraw(NOTATION_CIRCLE) ||
      IsToDraw(NOTATION_ROUNDEDBOX) ||
      (IsToDraw(NOTATION_TOP) && IsToDraw(NOTATION_BOTTOM))) {
    // center the menclose around the content (vertically)
    nscoord dy = NS_MAX(aDesiredSize.ascent - bmBase.ascent,
                        aDesiredSize.height - aDesiredSize.ascent -
                        bmBase.descent);

    aDesiredSize.ascent = bmBase.ascent + dy;
    aDesiredSize.height = aDesiredSize.ascent + bmBase.descent + dy;
  }

  // Update mBoundingMetrics ascent/descent
  if (IsToDraw(NOTATION_TOP) ||
      IsToDraw(NOTATION_RIGHT) ||
      IsToDraw(NOTATION_LEFT) ||
      IsToDraw(NOTATION_UPDIAGONALSTRIKE) ||
      IsToDraw(NOTATION_DOWNDIAGONALSTRIKE) ||
      IsToDraw(NOTATION_VERTICALSTRIKE) ||
      IsToDraw(NOTATION_CIRCLE) ||
      IsToDraw(NOTATION_ROUNDEDBOX))
    mBoundingMetrics.ascent = aDesiredSize.ascent;
  
  if (IsToDraw(NOTATION_BOTTOM) ||
      IsToDraw(NOTATION_RIGHT) ||
      IsToDraw(NOTATION_LEFT) ||
      IsToDraw(NOTATION_UPDIAGONALSTRIKE) ||
      IsToDraw(NOTATION_DOWNDIAGONALSTRIKE) ||
      IsToDraw(NOTATION_VERTICALSTRIKE) ||
      IsToDraw(NOTATION_CIRCLE) ||
      IsToDraw(NOTATION_ROUNDEDBOX))
    mBoundingMetrics.descent = aDesiredSize.height - aDesiredSize.ascent;

  aDesiredSize.mBoundingMetrics = mBoundingMetrics;
  
  mReference.x = 0;
  mReference.y = aDesiredSize.ascent;

  if (aPlaceOrigin) {
    //////////////////
    // Set position and size of MathMLChars
    if (IsToDraw(NOTATION_LONGDIV))
      mMathMLChar[mLongDivCharIndex].SetRect(nsRect(dx_left -
                                                    bmLongdivChar.width,
                                                    aDesiredSize.ascent -
                                                    longdivAscent,
                                                    bmLongdivChar.width,
                                                    bmLongdivChar.ascent +
                                                    bmLongdivChar.descent));

    if (IsToDraw(NOTATION_RADICAL))
      mMathMLChar[mRadicalCharIndex].SetRect(nsRect(dx_left -
                                                    bmRadicalChar.width,
                                                    aDesiredSize.ascent -
                                                    radicalAscent,
                                                    bmRadicalChar.width,
                                                    bmRadicalChar.ascent +
                                                    bmRadicalChar.descent));

    mContentWidth = bmBase.width;

    //////////////////
    // Finish reflowing child frames
    PositionRowChildFrames(dx_left, aDesiredSize.ascent);
  }

  return NS_OK;
}

nscoord
nsMathMLmencloseFrame::FixInterFrameSpacing(nsHTMLReflowMetrics& aDesiredSize)
{
  nscoord gap = nsMathMLContainerFrame::FixInterFrameSpacing(aDesiredSize);
  if (!gap)
    return 0;

  // Move the MathML characters
  nsRect rect;
  for (PRUint32 i = 0; i < mMathMLChar.Length(); i++) {
    mMathMLChar[i].GetRect(rect);
    rect.MoveBy(gap, 0);
    mMathMLChar[i].SetRect(rect);
  }

  return gap;
}

NS_IMETHODIMP
nsMathMLmencloseFrame::AttributeChanged(PRInt32         aNameSpaceID,
                                        nsIAtom*        aAttribute,
                                        PRInt32         aModType)
{
  if (aAttribute == nsGkAtoms::notation_) {
    mNotationsToDraw = 0;
    mLongDivCharIndex = mRadicalCharIndex = -1;
    mMathMLChar.Clear();
    
    InitNotations();
  }

  return nsMathMLContainerFrame::
    AttributeChanged(aNameSpaceID, aAttribute, aModType);
}

//////////////////
// the Style System will use these to pass the proper style context to our
// MathMLChar
nsStyleContext*
nsMathMLmencloseFrame::GetAdditionalStyleContext(PRInt32 aIndex) const
{
  PRInt32 len = mMathMLChar.Length();
  if (aIndex >= 0 && aIndex < len)
    return mMathMLChar[aIndex].GetStyleContext();
  else
    return nsnull;
}

void
nsMathMLmencloseFrame::SetAdditionalStyleContext(PRInt32          aIndex, 
                                                 nsStyleContext*  aStyleContext)
{
  PRInt32 len = mMathMLChar.Length();
  if (aIndex >= 0 && aIndex < len)
    mMathMLChar[aIndex].SetStyleContext(aStyleContext);
}

class nsDisplayNotation : public nsDisplayItem
{
public:
  nsDisplayNotation(nsIFrame* aFrame, const nsRect& aRect,
                    nscoord aThickness, nsMencloseNotation aType)
    : nsDisplayItem(aFrame), mRect(aRect), 
      mThickness(aThickness), mType(aType) {
    MOZ_COUNT_CTOR(nsDisplayNotation);
  }
#ifdef NS_BUILD_REFCNT_LOGGING
  virtual ~nsDisplayNotation() {
    MOZ_COUNT_DTOR(nsDisplayNotation);
  }
#endif

  virtual void Paint(nsDisplayListBuilder* aBuilder,
                     nsIRenderingContext* aCtx);
  NS_DISPLAY_DECL_NAME("MathMLMencloseNotation")

private:
  nsRect             mRect;
  nscoord            mThickness;
  nsMencloseNotation mType;
};

void nsDisplayNotation::Paint(nsDisplayListBuilder* aBuilder,
                              nsIRenderingContext* aCtx)
{
  // get the gfxRect
  nsPresContext* presContext = mFrame->PresContext();
  gfxRect rect = presContext->
    AppUnitsToGfxUnits(mRect + aBuilder->ToReferenceFrame(mFrame));

  // paint the frame with the current text color
  aCtx->SetColor(mFrame->GetStyleColor()->mColor);

  // change line width to mThickness
  gfxContext *gfxCtx = aCtx->ThebesContext();
  gfxFloat currentLineWidth = gfxCtx->CurrentLineWidth();
  gfxFloat e = presContext->AppUnitsToGfxUnits(mThickness);
  gfxCtx->SetLineWidth(e);

  rect.Inset(e / 2.0);

  gfxCtx->NewPath();

  switch(mType)
    {
    case NOTATION_CIRCLE:
      gfxCtx->Ellipse(rect.pos + rect.size / 2.0, rect.size);
      break;

    case NOTATION_ROUNDEDBOX:
      gfxCtx->RoundedRectangle(rect, gfxCornerSizes(3 * e), PR_TRUE);
      break;

    case NOTATION_UPDIAGONALSTRIKE:
      gfxCtx->Line(rect.BottomLeft(), rect.TopRight());
      break;

    case NOTATION_DOWNDIAGONALSTRIKE:
      gfxCtx->Line(rect.TopLeft(), rect.BottomRight());
      break;

    default:
      NS_NOTREACHED("This notation can not be drawn using nsDisplayNotation");
      break;
    }

  gfxCtx->Stroke();

  // restore previous line width
  gfxCtx->SetLineWidth(currentLineWidth);
}

nsresult
nsMathMLmencloseFrame::DisplayNotation(nsDisplayListBuilder* aBuilder,
                                       nsIFrame* aFrame, const nsRect& aRect,
                                       const nsDisplayListSet& aLists,
                                       nscoord aThickness,
                                       nsMencloseNotation aType)
{
  if (!aFrame->GetStyleVisibility()->IsVisible() || aRect.IsEmpty() ||
      aThickness <= 0)
    return NS_OK;

  return aLists.Content()->AppendNewToTop(new (aBuilder)
                                          nsDisplayNotation(aFrame, aRect,
                                                            aThickness,
                                                            aType));
}