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.

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
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */

#ifndef MOZ_UNITS_H_
#define MOZ_UNITS_H_

#include "mozilla/gfx/Coord.h"
#include "mozilla/gfx/Point.h"
#include "mozilla/gfx/Rect.h"
#include "mozilla/gfx/ScaleFactor.h"
#include "mozilla/gfx/ScaleFactors2D.h"
#include "nsMargin.h"
#include "nsRect.h"
#include "nsRegion.h"
#include "mozilla/AppUnits.h"
#include "mozilla/TypeTraits.h"

namespace mozilla {

template <typename T>
struct IsPixel : FalseType {};

// See struct declaration for a description of each unit type.
struct CSSPixel;
struct LayoutDevicePixel;
struct LayerPixel;
struct RenderTargetPixel;
struct ScreenPixel;
struct ParentLayerPixel;

template<> struct IsPixel<CSSPixel>          : TrueType {};
template<> struct IsPixel<LayoutDevicePixel> : TrueType {};
template<> struct IsPixel<LayerPixel>        : TrueType {};
template<> struct IsPixel<RenderTargetPixel> : TrueType {};
template<> struct IsPixel<ScreenPixel>       : TrueType {};
template<> struct IsPixel<ParentLayerPixel>  : TrueType {};

typedef gfx::CoordTyped<CSSPixel> CSSCoord;
typedef gfx::IntCoordTyped<CSSPixel> CSSIntCoord;
typedef gfx::PointTyped<CSSPixel> CSSPoint;
typedef gfx::IntPointTyped<CSSPixel> CSSIntPoint;
typedef gfx::SizeTyped<CSSPixel> CSSSize;
typedef gfx::IntSizeTyped<CSSPixel> CSSIntSize;
typedef gfx::RectTyped<CSSPixel> CSSRect;
typedef gfx::IntRectTyped<CSSPixel> CSSIntRect;
typedef gfx::MarginTyped<CSSPixel> CSSMargin;
typedef gfx::IntMarginTyped<CSSPixel> CSSIntMargin;
typedef gfx::IntRegionTyped<CSSPixel> CSSIntRegion;

typedef gfx::CoordTyped<LayoutDevicePixel> LayoutDeviceCoord;
typedef gfx::IntCoordTyped<LayoutDevicePixel> LayoutDeviceIntCoord;
typedef gfx::PointTyped<LayoutDevicePixel> LayoutDevicePoint;
typedef gfx::IntPointTyped<LayoutDevicePixel> LayoutDeviceIntPoint;
typedef gfx::SizeTyped<LayoutDevicePixel> LayoutDeviceSize;
typedef gfx::IntSizeTyped<LayoutDevicePixel> LayoutDeviceIntSize;
typedef gfx::RectTyped<LayoutDevicePixel> LayoutDeviceRect;
typedef gfx::IntRectTyped<LayoutDevicePixel> LayoutDeviceIntRect;
typedef gfx::MarginTyped<LayoutDevicePixel> LayoutDeviceMargin;
typedef gfx::IntMarginTyped<LayoutDevicePixel> LayoutDeviceIntMargin;
typedef gfx::IntRegionTyped<LayoutDevicePixel> LayoutDeviceIntRegion;

typedef gfx::CoordTyped<LayerPixel> LayerCoord;
typedef gfx::IntCoordTyped<LayerPixel> LayerIntCoord;
typedef gfx::PointTyped<LayerPixel> LayerPoint;
typedef gfx::IntPointTyped<LayerPixel> LayerIntPoint;
typedef gfx::SizeTyped<LayerPixel> LayerSize;
typedef gfx::IntSizeTyped<LayerPixel> LayerIntSize;
typedef gfx::RectTyped<LayerPixel> LayerRect;
typedef gfx::IntRectTyped<LayerPixel> LayerIntRect;
typedef gfx::MarginTyped<LayerPixel> LayerMargin;
typedef gfx::IntMarginTyped<LayerPixel> LayerIntMargin;
typedef gfx::IntRegionTyped<LayerPixel> LayerIntRegion;

typedef gfx::PointTyped<RenderTargetPixel> RenderTargetPoint;
typedef gfx::IntPointTyped<RenderTargetPixel> RenderTargetIntPoint;
typedef gfx::SizeTyped<RenderTargetPixel> RenderTargetSize;
typedef gfx::IntSizeTyped<RenderTargetPixel> RenderTargetIntSize;
typedef gfx::RectTyped<RenderTargetPixel> RenderTargetRect;
typedef gfx::IntRectTyped<RenderTargetPixel> RenderTargetIntRect;
typedef gfx::MarginTyped<RenderTargetPixel> RenderTargetMargin;
typedef gfx::IntMarginTyped<RenderTargetPixel> RenderTargetIntMargin;
typedef gfx::IntRegionTyped<RenderTargetPixel> RenderTargetIntRegion;

typedef gfx::CoordTyped<ScreenPixel> ScreenCoord;
typedef gfx::IntCoordTyped<ScreenPixel> ScreenIntCoord;
typedef gfx::PointTyped<ScreenPixel> ScreenPoint;
typedef gfx::IntPointTyped<ScreenPixel> ScreenIntPoint;
typedef gfx::SizeTyped<ScreenPixel> ScreenSize;
typedef gfx::IntSizeTyped<ScreenPixel> ScreenIntSize;
typedef gfx::RectTyped<ScreenPixel> ScreenRect;
typedef gfx::IntRectTyped<ScreenPixel> ScreenIntRect;
typedef gfx::MarginTyped<ScreenPixel> ScreenMargin;
typedef gfx::IntMarginTyped<ScreenPixel> ScreenIntMargin;
typedef gfx::IntRegionTyped<ScreenPixel> ScreenIntRegion;

typedef gfx::CoordTyped<ParentLayerPixel> ParentLayerCoord;
typedef gfx::IntCoordTyped<ParentLayerPixel> ParentLayerIntCoord;
typedef gfx::PointTyped<ParentLayerPixel> ParentLayerPoint;
typedef gfx::IntPointTyped<ParentLayerPixel> ParentLayerIntPoint;
typedef gfx::SizeTyped<ParentLayerPixel> ParentLayerSize;
typedef gfx::IntSizeTyped<ParentLayerPixel> ParentLayerIntSize;
typedef gfx::RectTyped<ParentLayerPixel> ParentLayerRect;
typedef gfx::IntRectTyped<ParentLayerPixel> ParentLayerIntRect;
typedef gfx::MarginTyped<ParentLayerPixel> ParentLayerMargin;
typedef gfx::IntMarginTyped<ParentLayerPixel> ParentLayerIntMargin;
typedef gfx::IntRegionTyped<ParentLayerPixel> ParentLayerIntRegion;

typedef gfx::ScaleFactor<CSSPixel, LayoutDevicePixel> CSSToLayoutDeviceScale;
typedef gfx::ScaleFactor<CSSPixel, LayerPixel> CSSToLayerScale;
typedef gfx::ScaleFactor<CSSPixel, ScreenPixel> CSSToScreenScale;
typedef gfx::ScaleFactor<CSSPixel, ParentLayerPixel> CSSToParentLayerScale;
typedef gfx::ScaleFactor<LayoutDevicePixel, CSSPixel> LayoutDeviceToCSSScale;
typedef gfx::ScaleFactor<LayoutDevicePixel, LayerPixel> LayoutDeviceToLayerScale;
typedef gfx::ScaleFactor<LayoutDevicePixel, ScreenPixel> LayoutDeviceToScreenScale;
typedef gfx::ScaleFactor<LayoutDevicePixel, ParentLayerPixel> LayoutDeviceToParentLayerScale;
typedef gfx::ScaleFactor<LayerPixel, CSSPixel> LayerToCSSScale;
typedef gfx::ScaleFactor<LayerPixel, LayoutDevicePixel> LayerToLayoutDeviceScale;
typedef gfx::ScaleFactor<LayerPixel, RenderTargetPixel> LayerToRenderTargetScale;
typedef gfx::ScaleFactor<LayerPixel, ScreenPixel> LayerToScreenScale;
typedef gfx::ScaleFactor<LayerPixel, ParentLayerPixel> LayerToParentLayerScale;
typedef gfx::ScaleFactor<RenderTargetPixel, ScreenPixel> RenderTargetToScreenScale;
typedef gfx::ScaleFactor<ScreenPixel, CSSPixel> ScreenToCSSScale;
typedef gfx::ScaleFactor<ScreenPixel, LayoutDevicePixel> ScreenToLayoutDeviceScale;
typedef gfx::ScaleFactor<ScreenPixel, LayerPixel> ScreenToLayerScale;
typedef gfx::ScaleFactor<ScreenPixel, ParentLayerPixel> ScreenToParentLayerScale;
typedef gfx::ScaleFactor<ParentLayerPixel, LayerPixel> ParentLayerToLayerScale;
typedef gfx::ScaleFactor<ParentLayerPixel, ScreenPixel> ParentLayerToScreenScale;
typedef gfx::ScaleFactor<ParentLayerPixel, ParentLayerPixel> ParentLayerToParentLayerScale;

typedef gfx::ScaleFactors2D<CSSPixel, LayoutDevicePixel> CSSToLayoutDeviceScale2D;
typedef gfx::ScaleFactors2D<CSSPixel, LayerPixel> CSSToLayerScale2D;
typedef gfx::ScaleFactors2D<CSSPixel, ScreenPixel> CSSToScreenScale2D;
typedef gfx::ScaleFactors2D<CSSPixel, ParentLayerPixel> CSSToParentLayerScale2D;
typedef gfx::ScaleFactors2D<LayoutDevicePixel, CSSPixel> LayoutDeviceToCSSScale2D;
typedef gfx::ScaleFactors2D<LayoutDevicePixel, LayerPixel> LayoutDeviceToLayerScale2D;
typedef gfx::ScaleFactors2D<LayoutDevicePixel, ScreenPixel> LayoutDeviceToScreenScale2D;
typedef gfx::ScaleFactors2D<LayoutDevicePixel, ParentLayerPixel> LayoutDeviceToParentLayerScale2D;
typedef gfx::ScaleFactors2D<LayerPixel, CSSPixel> LayerToCSSScale2D;
typedef gfx::ScaleFactors2D<LayerPixel, LayoutDevicePixel> LayerToLayoutDeviceScale2D;
typedef gfx::ScaleFactors2D<LayerPixel, RenderTargetPixel> LayerToRenderTargetScale2D;
typedef gfx::ScaleFactors2D<LayerPixel, ScreenPixel> LayerToScreenScale2D;
typedef gfx::ScaleFactors2D<LayerPixel, ParentLayerPixel> LayerToParentLayerScale2D;
typedef gfx::ScaleFactors2D<RenderTargetPixel, ScreenPixel> RenderTargetToScreenScale2D;
typedef gfx::ScaleFactors2D<ScreenPixel, CSSPixel> ScreenToCSSScale2D;
typedef gfx::ScaleFactors2D<ScreenPixel, LayoutDevicePixel> ScreenToLayoutDeviceScale2D;
typedef gfx::ScaleFactors2D<ScreenPixel, LayerPixel> ScreenToLayerScale2D;
typedef gfx::ScaleFactors2D<ScreenPixel, ParentLayerPixel> ScreenToParentLayerScale2D;
typedef gfx::ScaleFactors2D<ParentLayerPixel, LayerPixel> ParentLayerToLayerScale2D;
typedef gfx::ScaleFactors2D<ParentLayerPixel, ScreenPixel> ParentLayerToScreenScale2D;
typedef gfx::ScaleFactors2D<ParentLayerPixel, ParentLayerPixel> ParentLayerToParentLayerScale2D;

/*
 * The pixels that content authors use to specify sizes in.
 */
struct CSSPixel {

  // Conversions from app units

  static CSSPoint FromAppUnits(const nsPoint& aPoint) {
    return CSSPoint(NSAppUnitsToFloatPixels(aPoint.x, float(AppUnitsPerCSSPixel())),
                    NSAppUnitsToFloatPixels(aPoint.y, float(AppUnitsPerCSSPixel())));
  }

  static CSSSize FromAppUnits(const nsSize& aSize) {
    return CSSSize(NSAppUnitsToFloatPixels(aSize.width, float(AppUnitsPerCSSPixel())),
                   NSAppUnitsToFloatPixels(aSize.height, float(AppUnitsPerCSSPixel())));
  }

  static CSSRect FromAppUnits(const nsRect& aRect) {
    return CSSRect(NSAppUnitsToFloatPixels(aRect.x, float(AppUnitsPerCSSPixel())),
                   NSAppUnitsToFloatPixels(aRect.y, float(AppUnitsPerCSSPixel())),
                   NSAppUnitsToFloatPixels(aRect.width, float(AppUnitsPerCSSPixel())),
                   NSAppUnitsToFloatPixels(aRect.height, float(AppUnitsPerCSSPixel())));
  }

  static CSSMargin FromAppUnits(const nsMargin& aMargin) {
    return CSSMargin(NSAppUnitsToFloatPixels(aMargin.top, float(AppUnitsPerCSSPixel())),
                     NSAppUnitsToFloatPixels(aMargin.right, float(AppUnitsPerCSSPixel())),
                     NSAppUnitsToFloatPixels(aMargin.bottom, float(AppUnitsPerCSSPixel())),
                     NSAppUnitsToFloatPixels(aMargin.left, float(AppUnitsPerCSSPixel())));
  }

  static CSSIntPoint FromAppUnitsRounded(const nsPoint& aPoint) {
    return CSSIntPoint(NSAppUnitsToIntPixels(aPoint.x, float(AppUnitsPerCSSPixel())),
                       NSAppUnitsToIntPixels(aPoint.y, float(AppUnitsPerCSSPixel())));
  }

  static CSSIntSize FromAppUnitsRounded(const nsSize& aSize)
  {
    return CSSIntSize(NSAppUnitsToIntPixels(aSize.width, float(AppUnitsPerCSSPixel())),
                      NSAppUnitsToIntPixels(aSize.height, float(AppUnitsPerCSSPixel())));
  }

  static CSSIntRect FromAppUnitsRounded(const nsRect& aRect) {
    return CSSIntRect(NSAppUnitsToIntPixels(aRect.x, float(AppUnitsPerCSSPixel())),
                      NSAppUnitsToIntPixels(aRect.y, float(AppUnitsPerCSSPixel())),
                      NSAppUnitsToIntPixels(aRect.width, float(AppUnitsPerCSSPixel())),
                      NSAppUnitsToIntPixels(aRect.height, float(AppUnitsPerCSSPixel())));
  }

  // Conversions to app units

  static nsPoint ToAppUnits(const CSSPoint& aPoint) {
    return nsPoint(NSToCoordRoundWithClamp(aPoint.x * float(AppUnitsPerCSSPixel())),
                   NSToCoordRoundWithClamp(aPoint.y * float(AppUnitsPerCSSPixel())));
  }

  static nsPoint ToAppUnits(const CSSIntPoint& aPoint) {
    return nsPoint(NSToCoordRoundWithClamp(float(aPoint.x) * float(AppUnitsPerCSSPixel())),
                   NSToCoordRoundWithClamp(float(aPoint.y) * float(AppUnitsPerCSSPixel())));
  }

  static nsSize ToAppUnits(const CSSIntSize& aSize) {
    return nsSize(NSToCoordRoundWithClamp(float(aSize.width)  * float(AppUnitsPerCSSPixel())),
                  NSToCoordRoundWithClamp(float(aSize.height) * float(AppUnitsPerCSSPixel())));
  }

  static nsRect ToAppUnits(const CSSRect& aRect) {
    return nsRect(NSToCoordRoundWithClamp(aRect.x * float(AppUnitsPerCSSPixel())),
                  NSToCoordRoundWithClamp(aRect.y * float(AppUnitsPerCSSPixel())),
                  NSToCoordRoundWithClamp(aRect.width * float(AppUnitsPerCSSPixel())),
                  NSToCoordRoundWithClamp(aRect.height * float(AppUnitsPerCSSPixel())));
  }
};

/*
 * The pixels that are referred to as "device pixels" in layout code. In
 * general values measured in LayoutDevicePixels are obtained by dividing a
 * value in app units by AppUnitsPerDevPixel(). Conversion between CSS pixels
 * and LayoutDevicePixels is affected by:
 * 1) the "full zoom" (see nsPresContext::SetFullZoom)
 * 2) the "widget scale" (see nsIWidget::GetDefaultScale)
 */
struct LayoutDevicePixel {
  static LayoutDeviceRect FromAppUnits(const nsRect& aRect, nscoord aAppUnitsPerDevPixel) {
    return LayoutDeviceRect(NSAppUnitsToFloatPixels(aRect.x, float(aAppUnitsPerDevPixel)),
                            NSAppUnitsToFloatPixels(aRect.y, float(aAppUnitsPerDevPixel)),
                            NSAppUnitsToFloatPixels(aRect.width, float(aAppUnitsPerDevPixel)),
                            NSAppUnitsToFloatPixels(aRect.height, float(aAppUnitsPerDevPixel)));
  }

  static LayoutDevicePoint FromAppUnits(const nsPoint& aPoint, nscoord aAppUnitsPerDevPixel) {
    return LayoutDevicePoint(NSAppUnitsToFloatPixels(aPoint.x, aAppUnitsPerDevPixel),
                             NSAppUnitsToFloatPixels(aPoint.y, aAppUnitsPerDevPixel));
  }

  static LayoutDeviceMargin FromAppUnits(const nsMargin& aMargin, nscoord aAppUnitsPerDevPixel) {
    return LayoutDeviceMargin(NSAppUnitsToFloatPixels(aMargin.top, aAppUnitsPerDevPixel),
                              NSAppUnitsToFloatPixels(aMargin.right, aAppUnitsPerDevPixel),
                              NSAppUnitsToFloatPixels(aMargin.bottom, aAppUnitsPerDevPixel),
                              NSAppUnitsToFloatPixels(aMargin.left, aAppUnitsPerDevPixel));
  }

  static LayoutDeviceIntPoint FromAppUnitsRounded(const nsPoint& aPoint, nscoord aAppUnitsPerDevPixel) {
    return LayoutDeviceIntPoint(NSAppUnitsToIntPixels(aPoint.x, aAppUnitsPerDevPixel),
                                NSAppUnitsToIntPixels(aPoint.y, aAppUnitsPerDevPixel));
  }

  static LayoutDeviceIntPoint FromAppUnitsToNearest(const nsPoint& aPoint, nscoord aAppUnitsPerDevPixel) {
    return LayoutDeviceIntPoint::FromUnknownPoint(aPoint.ToNearestPixels(aAppUnitsPerDevPixel));
  }

  static LayoutDeviceIntRect FromAppUnitsToNearest(const nsRect& aRect, nscoord aAppUnitsPerDevPixel) {
    return LayoutDeviceIntRect::FromUnknownRect(aRect.ToNearestPixels(aAppUnitsPerDevPixel));
  }

  static LayoutDeviceIntSize FromAppUnitsRounded(const nsSize& aSize, nscoord aAppUnitsPerDevPixel) {
    return LayoutDeviceIntSize(
      NSAppUnitsToIntPixels(aSize.width, aAppUnitsPerDevPixel),
      NSAppUnitsToIntPixels(aSize.height, aAppUnitsPerDevPixel));
  }

  static nsPoint ToAppUnits(const LayoutDeviceIntPoint& aPoint, nscoord aAppUnitsPerDevPixel) {
    return nsPoint(aPoint.x * aAppUnitsPerDevPixel,
                   aPoint.y * aAppUnitsPerDevPixel);
  }

  static nsSize ToAppUnits(const LayoutDeviceIntSize& aSize, nscoord aAppUnitsPerDevPixel) {
    return nsSize(aSize.width * aAppUnitsPerDevPixel,
                  aSize.height * aAppUnitsPerDevPixel);
  }

  static nsSize ToAppUnits(const LayoutDeviceSize& aSize, nscoord aAppUnitsPerDevPixel) {
    return nsSize(NSFloatPixelsToAppUnits(aSize.width, aAppUnitsPerDevPixel),
                  NSFloatPixelsToAppUnits(aSize.height, aAppUnitsPerDevPixel));
  }

  static nsRect ToAppUnits(const LayoutDeviceRect& aRect, nscoord aAppUnitsPerDevPixel) {
    return nsRect(NSFloatPixelsToAppUnits(aRect.x, aAppUnitsPerDevPixel),
                  NSFloatPixelsToAppUnits(aRect.y, aAppUnitsPerDevPixel),
                  NSFloatPixelsToAppUnits(aRect.width, aAppUnitsPerDevPixel),
                  NSFloatPixelsToAppUnits(aRect.height, aAppUnitsPerDevPixel));
  }
};

/*
 * The pixels that layout rasterizes and delivers to the graphics code.
 * These also are generally referred to as "device pixels" in layout code.
 * Conversion between CSS pixels and LayerPixels is affected by:
 * 1) the "display resolution" (see nsIPresShell::SetResolution)
 * 2) the "full zoom" (see nsPresContext::SetFullZoom)
 * 3) the "widget scale" (see nsIWidget::GetDefaultScale)
 * 4) rasterizing at a different scale in the presence of some CSS transforms
 */
struct LayerPixel {
};

/*
 * Layers are always composited to a render target. This unit
 * represents one pixel in the render target. Note that for the
 * root render target RenderTargetPixel == ScreenPixel. Also
 * any ContainerLayer providing an intermediate surface will
 * have RenderTargetPixel == LayerPixel.
 */
struct RenderTargetPixel {
};

/*
 * The pixels that are displayed on the screen.
 * On non-OMTC platforms this should be equivalent to LayerPixel units.
 * On OMTC platforms these may diverge from LayerPixel units temporarily,
 * while an asynchronous zoom is happening, but should eventually converge
 * back to LayerPixel units. Some variables (such as those representing
 * chrome UI element sizes) that are not subject to content zoom should
 * generally be represented in ScreenPixel units.
 */
struct ScreenPixel {
};

/* The layer coordinates of the parent frame.
 * This can be arrived at in three ways:
 *   - Start with the CSS coordinates of the parent frame, multiply by the
 *     device scale and the cumulative resolution of the parent frame.
 *   - Start with the CSS coordinates of current frame, multiply by the device
 *     scale, the cumulative resolution of the current frame, and the scales
 *     from the CSS and async transforms of the current frame.
 *   - Start with global screen coordinates and unapply all CSS and async
 *     transforms from the root down to and including the parent.
 * It's helpful to look at https://wiki.mozilla.org/Platform/GFX/APZ#Coordinate_systems
 * to get a picture of how the various coordinate systems relate to each other.
 */
struct ParentLayerPixel {
};

// Operators to apply ScaleFactors directly to Coords, Points, Rects, Sizes and Margins

template<class src, class dst>
gfx::CoordTyped<dst> operator*(const gfx::CoordTyped<src>& aCoord, const gfx::ScaleFactor<src, dst>& aScale) {
  return gfx::CoordTyped<dst>(aCoord.value * aScale.scale);
}

template<class src, class dst>
gfx::CoordTyped<dst> operator/(const gfx::CoordTyped<src>& aCoord, const gfx::ScaleFactor<dst, src>& aScale) {
  return gfx::CoordTyped<dst>(aCoord.value / aScale.scale);
}

template<class src, class dst>
gfx::PointTyped<dst> operator*(const gfx::PointTyped<src>& aPoint, const gfx::ScaleFactor<src, dst>& aScale) {
  return gfx::PointTyped<dst>(aPoint.x * aScale.scale,
                              aPoint.y * aScale.scale);
}

template<class src, class dst>
gfx::PointTyped<dst> operator/(const gfx::PointTyped<src>& aPoint, const gfx::ScaleFactor<dst, src>& aScale) {
  return gfx::PointTyped<dst>(aPoint.x / aScale.scale,
                              aPoint.y / aScale.scale);
}

template<class src, class dst>
gfx::PointTyped<dst> operator*(const gfx::PointTyped<src>& aPoint, const gfx::ScaleFactors2D<src, dst>& aScale) {
  return gfx::PointTyped<dst>(aPoint.x * aScale.xScale,
                              aPoint.y * aScale.yScale);
}

template<class src, class dst>
gfx::PointTyped<dst> operator/(const gfx::PointTyped<src>& aPoint, const gfx::ScaleFactors2D<dst, src>& aScale) {
  return gfx::PointTyped<dst>(aPoint.x / aScale.xScale,
                              aPoint.y / aScale.yScale);
}

template<class src, class dst>
gfx::PointTyped<dst> operator*(const gfx::IntPointTyped<src>& aPoint, const gfx::ScaleFactor<src, dst>& aScale) {
  return gfx::PointTyped<dst>(float(aPoint.x) * aScale.scale,
                              float(aPoint.y) * aScale.scale);
}

template<class src, class dst>
gfx::PointTyped<dst> operator/(const gfx::IntPointTyped<src>& aPoint, const gfx::ScaleFactor<dst, src>& aScale) {
  return gfx::PointTyped<dst>(float(aPoint.x) / aScale.scale,
                              float(aPoint.y) / aScale.scale);
}

template<class src, class dst>
gfx::PointTyped<dst> operator*(const gfx::IntPointTyped<src>& aPoint, const gfx::ScaleFactors2D<src, dst>& aScale) {
  return gfx::PointTyped<dst>(float(aPoint.x) * aScale.xScale,
                              float(aPoint.y) * aScale.yScale);
}

template<class src, class dst>
gfx::PointTyped<dst> operator/(const gfx::IntPointTyped<src>& aPoint, const gfx::ScaleFactors2D<dst, src>& aScale) {
  return gfx::PointTyped<dst>(float(aPoint.x) / aScale.xScale,
                              float(aPoint.y) / aScale.yScale);
}

template<class src, class dst>
gfx::RectTyped<dst> operator*(const gfx::RectTyped<src>& aRect, const gfx::ScaleFactor<src, dst>& aScale) {
  return gfx::RectTyped<dst>(aRect.x * aScale.scale,
                             aRect.y * aScale.scale,
                             aRect.width * aScale.scale,
                             aRect.height * aScale.scale);
}

template<class src, class dst>
gfx::RectTyped<dst> operator/(const gfx::RectTyped<src>& aRect, const gfx::ScaleFactor<dst, src>& aScale) {
  return gfx::RectTyped<dst>(aRect.x / aScale.scale,
                             aRect.y / aScale.scale,
                             aRect.width / aScale.scale,
                             aRect.height / aScale.scale);
}

template<class src, class dst>
gfx::RectTyped<dst> operator*(const gfx::RectTyped<src>& aRect, const gfx::ScaleFactors2D<src, dst>& aScale) {
  return gfx::RectTyped<dst>(aRect.x * aScale.xScale,
                             aRect.y * aScale.yScale,
                             aRect.width * aScale.xScale,
                             aRect.height * aScale.yScale);
}

template<class src, class dst>
gfx::RectTyped<dst> operator/(const gfx::RectTyped<src>& aRect, const gfx::ScaleFactors2D<dst, src>& aScale) {
  return gfx::RectTyped<dst>(aRect.x / aScale.xScale,
                             aRect.y / aScale.yScale,
                             aRect.width / aScale.xScale,
                             aRect.height / aScale.yScale);
}

template<class src, class dst>
gfx::RectTyped<dst> operator*(const gfx::IntRectTyped<src>& aRect, const gfx::ScaleFactor<src, dst>& aScale) {
  return gfx::RectTyped<dst>(float(aRect.x) * aScale.scale,
                             float(aRect.y) * aScale.scale,
                             float(aRect.width) * aScale.scale,
                             float(aRect.height) * aScale.scale);
}

template<class src, class dst>
gfx::RectTyped<dst> operator/(const gfx::IntRectTyped<src>& aRect, const gfx::ScaleFactor<dst, src>& aScale) {
  return gfx::RectTyped<dst>(float(aRect.x) / aScale.scale,
                             float(aRect.y) / aScale.scale,
                             float(aRect.width) / aScale.scale,
                             float(aRect.height) / aScale.scale);
}

template<class src, class dst>
gfx::RectTyped<dst> operator*(const gfx::IntRectTyped<src>& aRect, const gfx::ScaleFactors2D<src, dst>& aScale) {
  return gfx::RectTyped<dst>(float(aRect.x) * aScale.xScale,
                             float(aRect.y) * aScale.yScale,
                             float(aRect.width) * aScale.xScale,
                             float(aRect.height) * aScale.yScale);
}

template<class src, class dst>
gfx::RectTyped<dst> operator/(const gfx::IntRectTyped<src>& aRect, const gfx::ScaleFactors2D<dst, src>& aScale) {
  return gfx::RectTyped<dst>(float(aRect.x) / aScale.xScale,
                             float(aRect.y) / aScale.yScale,
                             float(aRect.width) / aScale.xScale,
                             float(aRect.height) / aScale.yScale);
}

template<class src, class dst>
gfx::SizeTyped<dst> operator*(const gfx::SizeTyped<src>& aSize, const gfx::ScaleFactor<src, dst>& aScale) {
  return gfx::SizeTyped<dst>(aSize.width * aScale.scale,
                             aSize.height * aScale.scale);
}

template<class src, class dst>
gfx::SizeTyped<dst> operator/(const gfx::SizeTyped<src>& aSize, const gfx::ScaleFactor<dst, src>& aScale) {
  return gfx::SizeTyped<dst>(aSize.width / aScale.scale,
                              aSize.height / aScale.scale);
}

template<class src, class dst>
gfx::SizeTyped<dst> operator*(const gfx::SizeTyped<src>& aSize, const gfx::ScaleFactors2D<src, dst>& aScale) {
  return gfx::SizeTyped<dst>(aSize.width * aScale.xScale,
                             aSize.height * aScale.yScale);
}

template<class src, class dst>
gfx::SizeTyped<dst> operator/(const gfx::SizeTyped<src>& aSize, const gfx::ScaleFactors2D<dst, src>& aScale) {
  return gfx::SizeTyped<dst>(aSize.width / aScale.xScale,
                             aSize.height / aScale.yScale);
}

template<class src, class dst>
gfx::SizeTyped<dst> operator*(const gfx::IntSizeTyped<src>& aSize, const gfx::ScaleFactor<src, dst>& aScale) {
  return gfx::SizeTyped<dst>(float(aSize.width) * aScale.scale,
                             float(aSize.height) * aScale.scale);
}

template<class src, class dst>
gfx::SizeTyped<dst> operator/(const gfx::IntSizeTyped<src>& aSize, const gfx::ScaleFactor<dst, src>& aScale) {
  return gfx::SizeTyped<dst>(float(aSize.width) / aScale.scale,
                             float(aSize.height) / aScale.scale);
}

template<class src, class dst>
gfx::SizeTyped<dst> operator*(const gfx::IntSizeTyped<src>& aSize, const gfx::ScaleFactors2D<src, dst>& aScale) {
  return gfx::SizeTyped<dst>(float(aSize.width) * aScale.xScale,
                             float(aSize.height) * aScale.yScale);
}

template<class src, class dst>
gfx::SizeTyped<dst> operator/(const gfx::IntSizeTyped<src>& aSize, const gfx::ScaleFactors2D<dst, src>& aScale) {
  return gfx::SizeTyped<dst>(float(aSize.width) / aScale.xScale,
                             float(aSize.height) / aScale.yScale);
}

template<class src, class dst>
gfx::MarginTyped<dst> operator*(const gfx::MarginTyped<src>& aMargin, const gfx::ScaleFactor<src, dst>& aScale) {
  return gfx::MarginTyped<dst>(aMargin.top * aScale.scale,
                               aMargin.right * aScale.scale,
                               aMargin.bottom * aScale.scale,
                               aMargin.left * aScale.scale);
}

template<class src, class dst>
gfx::MarginTyped<dst> operator/(const gfx::MarginTyped<src>& aMargin, const gfx::ScaleFactor<dst, src>& aScale) {
  return gfx::MarginTyped<dst>(aMargin.top / aScale.scale,
                               aMargin.right / aScale.scale,
                               aMargin.bottom / aScale.scale,
                               aMargin.left / aScale.scale);
}

template<class src, class dst>
gfx::MarginTyped<dst> operator*(const gfx::MarginTyped<src>& aMargin, const gfx::ScaleFactors2D<src, dst>& aScale) {
  return gfx::MarginTyped<dst>(aMargin.top * aScale.yScale,
                               aMargin.right * aScale.xScale,
                               aMargin.bottom * aScale.yScale,
                               aMargin.left * aScale.xScale);
}

template<class src, class dst>
gfx::MarginTyped<dst> operator/(const gfx::MarginTyped<src>& aMargin, const gfx::ScaleFactors2D<dst, src>& aScale) {
  return gfx::MarginTyped<dst>(aMargin.top / aScale.yScale,
                               aMargin.right / aScale.xScale,
                               aMargin.bottom / aScale.yScale,
                               aMargin.left / aScale.xScale);
}

// Calculate the max or min or the ratios of the widths and heights of two
// sizes, returning a scale factor in the correct units.

template<class src, class dst>
gfx::ScaleFactor<src, dst> MaxScaleRatio(const gfx::SizeTyped<dst>& aDestSize, const gfx::SizeTyped<src>& aSrcSize) {
  return gfx::ScaleFactor<src, dst>(std::max(aDestSize.width / aSrcSize.width,
                                             aDestSize.height / aSrcSize.height));
}

template<class src, class dst>
gfx::ScaleFactor<src, dst> MinScaleRatio(const gfx::SizeTyped<dst>& aDestSize, const gfx::SizeTyped<src>& aSrcSize) {
  return gfx::ScaleFactor<src, dst>(std::min(aDestSize.width / aSrcSize.width,
                                             aDestSize.height / aSrcSize.height));
}

} // namespace mozilla

#endif