Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 974 insertions, 0 deletions

diff --git a/gfx/2d/HelpersD2D.h b/gfx/2d/HelpersD2D.h
new file mode 100644
index 0000000000..291dff9f53
--- /dev/null
+++ b/gfx/2d/HelpersD2D.h
@@ -0,0 +1,974 @@
+/* -*- 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 MOZILLA_GFX_HELPERSD2D_H_
+#define MOZILLA_GFX_HELPERSD2D_H_
+
+#include <d2d1_1.h>
+
+#include <vector>
+
+#include <dwrite.h>
+#include <versionhelpers.h>
+#include "2D.h"
+#include "Logging.h"
+#include "ImageScaling.h"
+
+#include "ScaledFontDWrite.h"
+
+#undef min
+#undef max
+
+namespace mozilla {
+namespace gfx {
+
+RefPtr<ID2D1Factory1> D2DFactory();
+
+static inline D2D1_POINT_2F D2DPoint(const Point& aPoint) {
+  return D2D1::Point2F(aPoint.x, aPoint.y);
+}
+
+static inline D2D1_SIZE_U D2DIntSize(const IntSize& aSize) {
+  return D2D1::SizeU(aSize.width, aSize.height);
+}
+
+template <typename T>
+static inline D2D1_RECT_F D2DRect(const T& aRect) {
+  return D2D1::RectF(aRect.X(), aRect.Y(), aRect.XMost(), aRect.YMost());
+}
+
+static inline D2D1_ROUNDED_RECT D2DRoundedRect(const RoundedRect& aRect) {
+  return D2D1::RoundedRect(D2DRect(aRect.rect),
+                           aRect.corners.BottomLeft().width,
+                           aRect.corners.BottomLeft().height);
+}
+
+static inline D2D1_EXTEND_MODE D2DExtend(ExtendMode aExtendMode, Axis aAxis) {
+  D2D1_EXTEND_MODE extend;
+  switch (aExtendMode) {
+    case ExtendMode::REPEAT:
+      extend = D2D1_EXTEND_MODE_WRAP;
+      break;
+    case ExtendMode::REPEAT_X: {
+      extend = aAxis == Axis::X_AXIS ? D2D1_EXTEND_MODE_WRAP
+                                     : D2D1_EXTEND_MODE_CLAMP;
+      break;
+    }
+    case ExtendMode::REPEAT_Y: {
+      extend = aAxis == Axis::Y_AXIS ? D2D1_EXTEND_MODE_WRAP
+                                     : D2D1_EXTEND_MODE_CLAMP;
+      break;
+    }
+    case ExtendMode::REFLECT:
+      extend = D2D1_EXTEND_MODE_MIRROR;
+      break;
+    default:
+      extend = D2D1_EXTEND_MODE_CLAMP;
+  }
+
+  return extend;
+}
+
+static inline D2D1_BITMAP_INTERPOLATION_MODE D2DFilter(
+    const SamplingFilter aSamplingFilter) {
+  switch (aSamplingFilter) {
+    case SamplingFilter::POINT:
+      return D2D1_BITMAP_INTERPOLATION_MODE_NEAREST_NEIGHBOR;
+    default:
+      return D2D1_BITMAP_INTERPOLATION_MODE_LINEAR;
+  }
+}
+
+static inline D2D1_INTERPOLATION_MODE D2DInterpolationMode(
+    const SamplingFilter aSamplingFilter) {
+  switch (aSamplingFilter) {
+    case SamplingFilter::POINT:
+      return D2D1_INTERPOLATION_MODE_NEAREST_NEIGHBOR;
+    default:
+      return D2D1_INTERPOLATION_MODE_LINEAR;
+  }
+}
+
+static inline D2D1_MATRIX_5X4_F D2DMatrix5x4(const Matrix5x4& aMatrix) {
+  return D2D1::Matrix5x4F(aMatrix._11, aMatrix._12, aMatrix._13, aMatrix._14,
+                          aMatrix._21, aMatrix._22, aMatrix._23, aMatrix._24,
+                          aMatrix._31, aMatrix._32, aMatrix._33, aMatrix._34,
+                          aMatrix._41, aMatrix._42, aMatrix._43, aMatrix._44,
+                          aMatrix._51, aMatrix._52, aMatrix._53, aMatrix._54);
+}
+
+static inline D2D1_VECTOR_3F D2DVector3D(const Point3D& aPoint) {
+  return D2D1::Vector3F(aPoint.x, aPoint.y, aPoint.z);
+}
+
+static inline D2D1_ANTIALIAS_MODE D2DAAMode(AntialiasMode aMode) {
+  switch (aMode) {
+    case AntialiasMode::NONE:
+      return D2D1_ANTIALIAS_MODE_ALIASED;
+    default:
+      return D2D1_ANTIALIAS_MODE_PER_PRIMITIVE;
+  }
+}
+
+static inline D2D1_MATRIX_3X2_F D2DMatrix(const Matrix& aTransform) {
+  return D2D1::Matrix3x2F(aTransform._11, aTransform._12, aTransform._21,
+                          aTransform._22, aTransform._31, aTransform._32);
+}
+
+static inline D2D1_COLOR_F D2DColor(const DeviceColor& aColor) {
+  return D2D1::ColorF(aColor.r, aColor.g, aColor.b, aColor.a);
+}
+
+static inline IntSize ToIntSize(const D2D1_SIZE_U& aSize) {
+  return IntSize(aSize.width, aSize.height);
+}
+
+static inline SurfaceFormat ToPixelFormat(const DXGI_FORMAT& aFormat) {
+  switch (aFormat) {
+    case DXGI_FORMAT_A8_UNORM:
+    case DXGI_FORMAT_R8_UNORM:
+      return SurfaceFormat::A8;
+    default:
+      return SurfaceFormat::B8G8R8A8;
+  }
+}
+
+static inline SurfaceFormat ToPixelFormat(const D2D1_PIXEL_FORMAT& aFormat) {
+  switch (aFormat.format) {
+    case DXGI_FORMAT_A8_UNORM:
+    case DXGI_FORMAT_R8_UNORM:
+      return SurfaceFormat::A8;
+    case DXGI_FORMAT_B8G8R8A8_UNORM:
+      if (aFormat.alphaMode == D2D1_ALPHA_MODE_IGNORE) {
+        return SurfaceFormat::B8G8R8X8;
+      } else {
+        return SurfaceFormat::B8G8R8A8;
+      }
+    default:
+      return SurfaceFormat::B8G8R8A8;
+  }
+}
+
+static inline Rect ToRect(const D2D1_RECT_F& aRect) {
+  return Rect(aRect.left, aRect.top, aRect.right - aRect.left,
+              aRect.bottom - aRect.top);
+}
+
+static inline Matrix ToMatrix(const D2D1_MATRIX_3X2_F& aTransform) {
+  return Matrix(aTransform._11, aTransform._12, aTransform._21, aTransform._22,
+                aTransform._31, aTransform._32);
+}
+
+static inline Point ToPoint(const D2D1_POINT_2F& aPoint) {
+  return Point(aPoint.x, aPoint.y);
+}
+
+static inline DXGI_FORMAT DXGIFormat(SurfaceFormat aFormat) {
+  switch (aFormat) {
+    case SurfaceFormat::B8G8R8A8:
+      return DXGI_FORMAT_B8G8R8A8_UNORM;
+    case SurfaceFormat::B8G8R8X8:
+      return DXGI_FORMAT_B8G8R8A8_UNORM;
+    case SurfaceFormat::A8:
+      return DXGI_FORMAT_A8_UNORM;
+    default:
+      return DXGI_FORMAT_UNKNOWN;
+  }
+}
+
+static inline D2D1_ALPHA_MODE D2DAlphaModeForFormat(SurfaceFormat aFormat) {
+  switch (aFormat) {
+    case SurfaceFormat::B8G8R8X8:
+      return D2D1_ALPHA_MODE_IGNORE;
+    default:
+      return D2D1_ALPHA_MODE_PREMULTIPLIED;
+  }
+}
+
+static inline D2D1_PIXEL_FORMAT D2DPixelFormat(SurfaceFormat aFormat) {
+  return D2D1::PixelFormat(DXGIFormat(aFormat), D2DAlphaModeForFormat(aFormat));
+}
+
+static inline bool D2DSupportsCompositeMode(CompositionOp aOp) {
+  switch (aOp) {
+    case CompositionOp::OP_OVER:
+    case CompositionOp::OP_ADD:
+    case CompositionOp::OP_ATOP:
+    case CompositionOp::OP_OUT:
+    case CompositionOp::OP_IN:
+    case CompositionOp::OP_SOURCE:
+    case CompositionOp::OP_DEST_IN:
+    case CompositionOp::OP_DEST_OUT:
+    case CompositionOp::OP_DEST_OVER:
+    case CompositionOp::OP_DEST_ATOP:
+    case CompositionOp::OP_XOR:
+      return true;
+    default:
+      return false;
+  }
+}
+
+static inline D2D1_COMPOSITE_MODE D2DCompositionMode(CompositionOp aOp) {
+  switch (aOp) {
+    case CompositionOp::OP_OVER:
+      return D2D1_COMPOSITE_MODE_SOURCE_OVER;
+    case CompositionOp::OP_ADD:
+      return D2D1_COMPOSITE_MODE_PLUS;
+    case CompositionOp::OP_ATOP:
+      return D2D1_COMPOSITE_MODE_SOURCE_ATOP;
+    case CompositionOp::OP_OUT:
+      return D2D1_COMPOSITE_MODE_SOURCE_OUT;
+    case CompositionOp::OP_IN:
+      return D2D1_COMPOSITE_MODE_SOURCE_IN;
+    case CompositionOp::OP_SOURCE:
+      return D2D1_COMPOSITE_MODE_SOURCE_COPY;
+    case CompositionOp::OP_DEST_IN:
+      return D2D1_COMPOSITE_MODE_DESTINATION_IN;
+    case CompositionOp::OP_DEST_OUT:
+      return D2D1_COMPOSITE_MODE_DESTINATION_OUT;
+    case CompositionOp::OP_DEST_OVER:
+      return D2D1_COMPOSITE_MODE_DESTINATION_OVER;
+    case CompositionOp::OP_DEST_ATOP:
+      return D2D1_COMPOSITE_MODE_DESTINATION_ATOP;
+    case CompositionOp::OP_XOR:
+      return D2D1_COMPOSITE_MODE_XOR;
+    default:
+      return D2D1_COMPOSITE_MODE_SOURCE_OVER;
+  }
+}
+
+static inline D2D1_BLEND_MODE D2DBlendMode(CompositionOp aOp) {
+  switch (aOp) {
+    case CompositionOp::OP_MULTIPLY:
+      return D2D1_BLEND_MODE_MULTIPLY;
+    case CompositionOp::OP_SCREEN:
+      return D2D1_BLEND_MODE_SCREEN;
+    case CompositionOp::OP_OVERLAY:
+      return D2D1_BLEND_MODE_OVERLAY;
+    case CompositionOp::OP_DARKEN:
+      return D2D1_BLEND_MODE_DARKEN;
+    case CompositionOp::OP_LIGHTEN:
+      return D2D1_BLEND_MODE_LIGHTEN;
+    case CompositionOp::OP_COLOR_DODGE:
+      return D2D1_BLEND_MODE_COLOR_DODGE;
+    case CompositionOp::OP_COLOR_BURN:
+      return D2D1_BLEND_MODE_COLOR_BURN;
+    case CompositionOp::OP_HARD_LIGHT:
+      return D2D1_BLEND_MODE_HARD_LIGHT;
+    case CompositionOp::OP_SOFT_LIGHT:
+      return D2D1_BLEND_MODE_SOFT_LIGHT;
+    case CompositionOp::OP_DIFFERENCE:
+      return D2D1_BLEND_MODE_DIFFERENCE;
+    case CompositionOp::OP_EXCLUSION:
+      return D2D1_BLEND_MODE_EXCLUSION;
+    case CompositionOp::OP_HUE:
+      return D2D1_BLEND_MODE_HUE;
+    case CompositionOp::OP_SATURATION:
+      return D2D1_BLEND_MODE_SATURATION;
+    case CompositionOp::OP_COLOR:
+      return D2D1_BLEND_MODE_COLOR;
+    case CompositionOp::OP_LUMINOSITY:
+      return D2D1_BLEND_MODE_LUMINOSITY;
+    default:
+      return D2D1_BLEND_MODE_MULTIPLY;
+  }
+}
+
+static inline bool D2DSupportsPrimitiveBlendMode(CompositionOp aOp) {
+  switch (aOp) {
+    case CompositionOp::OP_OVER:
+      //  case CompositionOp::OP_SOURCE:
+      return true;
+      //  case CompositionOp::OP_DARKEN:
+    case CompositionOp::OP_ADD:
+      return IsWindows8Point1OrGreater();
+    default:
+      return false;
+  }
+}
+
+static inline D2D1_PRIMITIVE_BLEND D2DPrimitiveBlendMode(CompositionOp aOp) {
+  switch (aOp) {
+    case CompositionOp::OP_OVER:
+      return D2D1_PRIMITIVE_BLEND_SOURCE_OVER;
+    // D2D1_PRIMITIVE_BLEND_COPY should leave pixels out of the source's
+    // bounds unchanged, but doesn't- breaking unbounded ops.
+    // D2D1_PRIMITIVE_BLEND_MIN doesn't quite work like darken either, as it
+    // accounts for the source alpha.
+    //
+    // case CompositionOp::OP_SOURCE:
+    //   return D2D1_PRIMITIVE_BLEND_COPY;
+    // case CompositionOp::OP_DARKEN:
+    //   return D2D1_PRIMITIVE_BLEND_MIN;
+    case CompositionOp::OP_ADD:
+      return D2D1_PRIMITIVE_BLEND_ADD;
+    default:
+      return D2D1_PRIMITIVE_BLEND_SOURCE_OVER;
+  }
+}
+
+static inline bool IsPatternSupportedByD2D(const Pattern& aPattern) {
+  if (aPattern.GetType() == PatternType::CONIC_GRADIENT) {
+    return false;
+  }
+
+  if (aPattern.GetType() != PatternType::RADIAL_GRADIENT) {
+    return true;
+  }
+
+  const RadialGradientPattern* pat =
+      static_cast<const RadialGradientPattern*>(&aPattern);
+
+  if (pat->mRadius1 != 0) {
+    return false;
+  }
+
+  Point diff = pat->mCenter2 - pat->mCenter1;
+
+  if (sqrt(diff.x * diff.x + diff.y * diff.y) >= pat->mRadius2) {
+    // Inner point lies outside the circle.
+    return false;
+  }
+
+  return true;
+}
+
+/**
+ * This structure is used to pass rectangles to our shader constant. We can use
+ * this for passing rectangular areas to SetVertexShaderConstant. In the format
+ * of a 4 component float(x,y,width,height). Our vertex shader can then use
+ * this to construct rectangular positions from the 0,0-1,1 quad that we source
+ * it with.
+ */
+struct ShaderConstantRectD3D10 {
+  float mX, mY, mWidth, mHeight;
+  ShaderConstantRectD3D10(float aX, float aY, float aWidth, float aHeight)
+      : mX(aX), mY(aY), mWidth(aWidth), mHeight(aHeight) {}
+
+  // For easy passing to SetVertexShaderConstantF.
+  operator float*() { return &mX; }
+};
+
+static inline DWRITE_MATRIX DWriteMatrixFromMatrix(Matrix& aMatrix) {
+  DWRITE_MATRIX mat;
+  mat.m11 = aMatrix._11;
+  mat.m12 = aMatrix._12;
+  mat.m21 = aMatrix._21;
+  mat.m22 = aMatrix._22;
+  mat.dx = aMatrix._31;
+  mat.dy = aMatrix._32;
+  return mat;
+}
+
+class AutoDWriteGlyphRun : public DWRITE_GLYPH_RUN {
+  static const unsigned kNumAutoGlyphs = 256;
+
+ public:
+  AutoDWriteGlyphRun() { glyphCount = 0; }
+
+  ~AutoDWriteGlyphRun() {
+    if (glyphCount > kNumAutoGlyphs) {
+      delete[] glyphIndices;
+      delete[] glyphAdvances;
+      delete[] glyphOffsets;
+    }
+  }
+
+  void allocate(unsigned aNumGlyphs) {
+    glyphCount = aNumGlyphs;
+    if (aNumGlyphs <= kNumAutoGlyphs) {
+      glyphIndices = &mAutoIndices[0];
+      glyphAdvances = &mAutoAdvances[0];
+      glyphOffsets = &mAutoOffsets[0];
+    } else {
+      glyphIndices = new UINT16[aNumGlyphs];
+      glyphAdvances = new FLOAT[aNumGlyphs];
+      glyphOffsets = new DWRITE_GLYPH_OFFSET[aNumGlyphs];
+    }
+  }
+
+ private:
+  DWRITE_GLYPH_OFFSET mAutoOffsets[kNumAutoGlyphs];
+  FLOAT mAutoAdvances[kNumAutoGlyphs];
+  UINT16 mAutoIndices[kNumAutoGlyphs];
+};
+
+static inline void DWriteGlyphRunFromGlyphs(const GlyphBuffer& aGlyphs,
+                                            ScaledFontDWrite* aFont,
+                                            AutoDWriteGlyphRun* run) {
+  run->allocate(aGlyphs.mNumGlyphs);
+
+  FLOAT* advances = const_cast<FLOAT*>(run->glyphAdvances);
+  UINT16* indices = const_cast<UINT16*>(run->glyphIndices);
+  DWRITE_GLYPH_OFFSET* offsets =
+      const_cast<DWRITE_GLYPH_OFFSET*>(run->glyphOffsets);
+
+  memset(advances, 0, sizeof(FLOAT) * aGlyphs.mNumGlyphs);
+  for (unsigned int i = 0; i < aGlyphs.mNumGlyphs; i++) {
+    indices[i] = aGlyphs.mGlyphs[i].mIndex;
+    offsets[i].advanceOffset = aGlyphs.mGlyphs[i].mPosition.x;
+    offsets[i].ascenderOffset = -aGlyphs.mGlyphs[i].mPosition.y;
+  }
+
+  run->bidiLevel = 0;
+  run->fontFace = aFont->mFontFace;
+  run->fontEmSize = aFont->GetSize();
+  run->glyphCount = aGlyphs.mNumGlyphs;
+  run->isSideways = FALSE;
+}
+
+static inline already_AddRefed<ID2D1Geometry> ConvertRectToGeometry(
+    const D2D1_RECT_F& aRect) {
+  RefPtr<ID2D1RectangleGeometry> rectGeom;
+  D2DFactory()->CreateRectangleGeometry(&aRect, getter_AddRefs(rectGeom));
+  return rectGeom.forget();
+}
+
+static inline already_AddRefed<ID2D1Geometry> GetTransformedGeometry(
+    ID2D1Geometry* aGeometry, const D2D1_MATRIX_3X2_F& aTransform) {
+  RefPtr<ID2D1PathGeometry> tmpGeometry;
+  D2DFactory()->CreatePathGeometry(getter_AddRefs(tmpGeometry));
+  RefPtr<ID2D1GeometrySink> currentSink;
+  tmpGeometry->Open(getter_AddRefs(currentSink));
+  aGeometry->Simplify(D2D1_GEOMETRY_SIMPLIFICATION_OPTION_CUBICS_AND_LINES,
+                      aTransform, currentSink);
+  currentSink->Close();
+  return tmpGeometry.forget();
+}
+
+static inline already_AddRefed<ID2D1Geometry> IntersectGeometry(
+    ID2D1Geometry* aGeometryA, ID2D1Geometry* aGeometryB) {
+  RefPtr<ID2D1PathGeometry> pathGeom;
+  D2DFactory()->CreatePathGeometry(getter_AddRefs(pathGeom));
+  RefPtr<ID2D1GeometrySink> sink;
+  pathGeom->Open(getter_AddRefs(sink));
+  aGeometryA->CombineWithGeometry(aGeometryB, D2D1_COMBINE_MODE_INTERSECT,
+                                  nullptr, sink);
+  sink->Close();
+
+  return pathGeom.forget();
+}
+
+static inline already_AddRefed<ID2D1StrokeStyle> CreateStrokeStyleForOptions(
+    const StrokeOptions& aStrokeOptions) {
+  RefPtr<ID2D1StrokeStyle> style;
+
+  D2D1_CAP_STYLE capStyle;
+  D2D1_LINE_JOIN joinStyle;
+
+  switch (aStrokeOptions.mLineCap) {
+    case CapStyle::BUTT:
+      capStyle = D2D1_CAP_STYLE_FLAT;
+      break;
+    case CapStyle::ROUND:
+      capStyle = D2D1_CAP_STYLE_ROUND;
+      break;
+    case CapStyle::SQUARE:
+      capStyle = D2D1_CAP_STYLE_SQUARE;
+      break;
+  }
+
+  switch (aStrokeOptions.mLineJoin) {
+    case JoinStyle::MITER:
+      joinStyle = D2D1_LINE_JOIN_MITER;
+      break;
+    case JoinStyle::MITER_OR_BEVEL:
+      joinStyle = D2D1_LINE_JOIN_MITER_OR_BEVEL;
+      break;
+    case JoinStyle::ROUND:
+      joinStyle = D2D1_LINE_JOIN_ROUND;
+      break;
+    case JoinStyle::BEVEL:
+      joinStyle = D2D1_LINE_JOIN_BEVEL;
+      break;
+  }
+
+  HRESULT hr;
+  // We need to check mDashLength in addition to mDashPattern here since if
+  // mDashPattern is set but mDashLength is zero then the stroke will fail to
+  // paint.
+  if (aStrokeOptions.mDashLength > 0 && aStrokeOptions.mDashPattern) {
+    typedef std::vector<Float> FloatVector;
+    // D2D "helpfully" multiplies the dash pattern by the line width.
+    // That's not what cairo does, or is what <canvas>'s dash wants.
+    // So fix the multiplication in advance.
+    Float lineWidth = aStrokeOptions.mLineWidth;
+    FloatVector dash(aStrokeOptions.mDashPattern,
+                     aStrokeOptions.mDashPattern + aStrokeOptions.mDashLength);
+    for (FloatVector::iterator it = dash.begin(); it != dash.end(); ++it) {
+      *it /= lineWidth;
+    }
+
+    hr = D2DFactory()->CreateStrokeStyle(
+        D2D1::StrokeStyleProperties(
+            capStyle, capStyle, capStyle, joinStyle, aStrokeOptions.mMiterLimit,
+            D2D1_DASH_STYLE_CUSTOM, aStrokeOptions.mDashOffset / lineWidth),
+        &dash[0],  // data() is not C++98, although it's in recent gcc
+                   // and VC10's STL
+        dash.size(), getter_AddRefs(style));
+  } else {
+    hr = D2DFactory()->CreateStrokeStyle(
+        D2D1::StrokeStyleProperties(capStyle, capStyle, capStyle, joinStyle,
+                                    aStrokeOptions.mMiterLimit),
+        nullptr, 0, getter_AddRefs(style));
+  }
+
+  if (FAILED(hr)) {
+    gfxWarning() << "Failed to create Direct2D stroke style.";
+  }
+
+  return style.forget();
+}
+
+// This creates a (partially) uploaded bitmap for a DataSourceSurface. It
+// uploads the minimum requirement and possibly downscales. It adjusts the
+// input Matrix to compensate.
+static inline already_AddRefed<ID2D1Bitmap> CreatePartialBitmapForSurface(
+    DataSourceSurface* aSurface, const Matrix& aDestinationTransform,
+    const IntSize& aDestinationSize, ExtendMode aExtendMode,
+    Matrix& aSourceTransform, ID2D1RenderTarget* aRT,
+    const IntRect* aSourceRect = nullptr) {
+  RefPtr<ID2D1Bitmap> bitmap;
+
+  // This is where things get complicated. The source surface was
+  // created for a surface that was too large to fit in a texture.
+  // We'll need to figure out if we can work with a partial upload
+  // or downsample in software.
+
+  Matrix transform = aDestinationTransform;
+  Matrix invTransform = transform = aSourceTransform * transform;
+  if (!invTransform.Invert()) {
+    // Singular transform, nothing to be drawn.
+    return nullptr;
+  }
+
+  Rect rect(0, 0, Float(aDestinationSize.width),
+            Float(aDestinationSize.height));
+
+  // Calculate the rectangle of the source mapped to our surface.
+  rect = invTransform.TransformBounds(rect);
+  rect.RoundOut();
+
+  IntSize size = aSurface->GetSize();
+
+  Rect uploadRect(0, 0, Float(size.width), Float(size.height));
+  if (aSourceRect) {
+    uploadRect = Rect(aSourceRect->X(), aSourceRect->Y(), aSourceRect->Width(),
+                      aSourceRect->Height());
+  }
+
+  // Limit the uploadRect as much as possible without supporting discontiguous
+  // uploads
+  //
+  // clang-format off
+  //                               region we will paint from
+  //   uploadRect
+  //   .---------------.              .---------------.         resulting uploadRect
+  //   |               |rect          |               |
+  //   |          .---------.         .----.     .----.          .---------------.
+  //   |          |         |  ---->  |    |     |    |   ---->  |               |
+  //   |          '---------'         '----'     '----'          '---------------'
+  //   '---------------'              '---------------'
+  // clang-format on
+  //
+  //
+
+  int Bpp = BytesPerPixel(aSurface->GetFormat());
+
+  if (uploadRect.Contains(rect)) {
+    // Extend mode is irrelevant, the displayed rect is completely contained
+    // by the source bitmap.
+    uploadRect = rect;
+  } else if (aExtendMode == ExtendMode::CLAMP && uploadRect.Intersects(rect)) {
+    // Calculate the rectangle on the source bitmap that touches our
+    // surface, and upload that, for ExtendMode::CLAMP we can actually guarantee
+    // correct behaviour in this case.
+    uploadRect = uploadRect.Intersect(rect);
+
+    // We now proceed to check if we can limit at least one dimension of the
+    // upload rect safely without looking at extend mode.
+  } else if (rect.X() >= 0 && rect.XMost() < size.width) {
+    uploadRect.MoveToX(rect.X());
+    uploadRect.SetWidth(rect.Width());
+  } else if (rect.Y() >= 0 && rect.YMost() < size.height) {
+    uploadRect.MoveToY(rect.Y());
+    uploadRect.SetHeight(rect.Height());
+  }
+
+  if (uploadRect.IsEmpty()) {
+    // Nothing to be drawn.
+    return nullptr;
+  }
+
+  if (uploadRect.Width() <= aRT->GetMaximumBitmapSize() &&
+      uploadRect.Height() <= aRT->GetMaximumBitmapSize()) {
+    {
+      // Scope to auto-Unmap() |mapping|.
+      DataSourceSurface::ScopedMap mapping(aSurface, DataSourceSurface::READ);
+      if (MOZ2D_WARN_IF(!mapping.IsMapped())) {
+        return nullptr;
+      }
+
+      // A partial upload will suffice.
+      aRT->CreateBitmap(
+          D2D1::SizeU(uint32_t(uploadRect.Width()),
+                      uint32_t(uploadRect.Height())),
+          mapping.GetData() + int(uploadRect.X()) * Bpp +
+              int(uploadRect.Y()) * mapping.GetStride(),
+          mapping.GetStride(),
+          D2D1::BitmapProperties(D2DPixelFormat(aSurface->GetFormat())),
+          getter_AddRefs(bitmap));
+    }
+
+    aSourceTransform.PreTranslate(uploadRect.X(), uploadRect.Y());
+
+    return bitmap.forget();
+  } else {
+    if (Bpp != 4) {
+      // This shouldn't actually happen in practice!
+      MOZ_ASSERT(false);
+      return nullptr;
+    }
+
+    {
+      // Scope to auto-Unmap() |mapping|.
+      DataSourceSurface::ScopedMap mapping(aSurface, DataSourceSurface::READ);
+      if (MOZ2D_WARN_IF(!mapping.IsMapped())) {
+        return nullptr;
+      }
+      ImageHalfScaler scaler(mapping.GetData(), mapping.GetStride(), size);
+
+      // Calculate the maximum width/height of the image post transform.
+      Point topRight = transform.TransformPoint(Point(Float(size.width), 0));
+      Point topLeft = transform.TransformPoint(Point(0, 0));
+      Point bottomRight = transform.TransformPoint(
+          Point(Float(size.width), Float(size.height)));
+      Point bottomLeft = transform.TransformPoint(Point(0, Float(size.height)));
+
+      IntSize scaleSize;
+
+      scaleSize.width = int32_t(std::max(Distance(topRight, topLeft),
+                                         Distance(bottomRight, bottomLeft)));
+      scaleSize.height = int32_t(std::max(Distance(topRight, bottomRight),
+                                          Distance(topLeft, bottomLeft)));
+
+      if (unsigned(scaleSize.width) > aRT->GetMaximumBitmapSize()) {
+        // Ok, in this case we'd really want a downscale of a part of the
+        // bitmap, perhaps we can do this later but for simplicity let's do
+        // something different here and assume it's good enough, this should be
+        // rare!
+        scaleSize.width = 4095;
+      }
+      if (unsigned(scaleSize.height) > aRT->GetMaximumBitmapSize()) {
+        scaleSize.height = 4095;
+      }
+
+      scaler.ScaleForSize(scaleSize);
+
+      IntSize newSize = scaler.GetSize();
+
+      if (newSize.IsEmpty()) {
+        return nullptr;
+      }
+
+      aRT->CreateBitmap(
+          D2D1::SizeU(newSize.width, newSize.height), scaler.GetScaledData(),
+          scaler.GetStride(),
+          D2D1::BitmapProperties(D2DPixelFormat(aSurface->GetFormat())),
+          getter_AddRefs(bitmap));
+
+      aSourceTransform.PreScale(Float(size.width) / newSize.width,
+                                Float(size.height) / newSize.height);
+    }
+    return bitmap.forget();
+  }
+}
+
+static inline void AddRectToSink(ID2D1GeometrySink* aSink,
+                                 const D2D1_RECT_F& aRect) {
+  aSink->BeginFigure(D2D1::Point2F(aRect.left, aRect.top),
+                     D2D1_FIGURE_BEGIN_FILLED);
+  aSink->AddLine(D2D1::Point2F(aRect.right, aRect.top));
+  aSink->AddLine(D2D1::Point2F(aRect.right, aRect.bottom));
+  aSink->AddLine(D2D1::Point2F(aRect.left, aRect.bottom));
+  aSink->EndFigure(D2D1_FIGURE_END_CLOSED);
+}
+
+class DCCommandSink : public ID2D1CommandSink {
+ public:
+  explicit DCCommandSink(ID2D1DeviceContext* aCtx) : mCtx(aCtx) {}
+
+  HRESULT STDMETHODCALLTYPE QueryInterface(const IID& aIID, void** aPtr) {
+    if (!aPtr) {
+      return E_POINTER;
+    }
+
+    if (aIID == IID_IUnknown) {
+      *aPtr = static_cast<IUnknown*>(this);
+      return S_OK;
+    } else if (aIID == IID_ID2D1CommandSink) {
+      *aPtr = static_cast<ID2D1CommandSink*>(this);
+      return S_OK;
+    }
+
+    return E_NOINTERFACE;
+  }
+
+  ULONG STDMETHODCALLTYPE AddRef() { return 1; }
+
+  ULONG STDMETHODCALLTYPE Release() { return 1; }
+
+  STDMETHODIMP BeginDraw() {
+    // We don't want to do anything here!
+    return S_OK;
+  }
+  STDMETHODIMP EndDraw() {
+    // We don't want to do anything here!
+    return S_OK;
+  }
+
+  STDMETHODIMP SetAntialiasMode(D2D1_ANTIALIAS_MODE antialiasMode) {
+    mCtx->SetAntialiasMode(antialiasMode);
+    return S_OK;
+  }
+
+  STDMETHODIMP SetTags(D2D1_TAG tag1, D2D1_TAG tag2) {
+    mCtx->SetTags(tag1, tag2);
+    return S_OK;
+  }
+
+  STDMETHODIMP SetTextAntialiasMode(
+      D2D1_TEXT_ANTIALIAS_MODE textAntialiasMode) {
+    mCtx->SetTextAntialiasMode(textAntialiasMode);
+    return S_OK;
+  }
+
+  STDMETHODIMP SetTextRenderingParams(
+      _In_opt_ IDWriteRenderingParams* textRenderingParams) {
+    mCtx->SetTextRenderingParams(textRenderingParams);
+    return S_OK;
+  }
+
+  STDMETHODIMP SetTransform(_In_ CONST D2D1_MATRIX_3X2_F* transform) {
+    mCtx->SetTransform(transform);
+    return S_OK;
+  }
+
+  STDMETHODIMP SetPrimitiveBlend(D2D1_PRIMITIVE_BLEND primitiveBlend) {
+    mCtx->SetPrimitiveBlend(primitiveBlend);
+    return S_OK;
+  }
+
+  STDMETHODIMP SetUnitMode(D2D1_UNIT_MODE unitMode) {
+    mCtx->SetUnitMode(unitMode);
+    return S_OK;
+  }
+
+  STDMETHODIMP Clear(_In_opt_ CONST D2D1_COLOR_F* color) {
+    mCtx->Clear(color);
+    return S_OK;
+  }
+
+  STDMETHODIMP DrawGlyphRun(
+      D2D1_POINT_2F baselineOrigin, _In_ CONST DWRITE_GLYPH_RUN* glyphRun,
+      _In_opt_ CONST DWRITE_GLYPH_RUN_DESCRIPTION* glyphRunDescription,
+      _In_ ID2D1Brush* foregroundBrush, DWRITE_MEASURING_MODE measuringMode) {
+    mCtx->DrawGlyphRun(baselineOrigin, glyphRun, glyphRunDescription,
+                       foregroundBrush, measuringMode);
+    return S_OK;
+  }
+
+  STDMETHODIMP DrawLine(D2D1_POINT_2F point0, D2D1_POINT_2F point1,
+                        _In_ ID2D1Brush* brush, FLOAT strokeWidth,
+                        _In_opt_ ID2D1StrokeStyle* strokeStyle) {
+    mCtx->DrawLine(point0, point1, brush, strokeWidth, strokeStyle);
+    return S_OK;
+  }
+
+  STDMETHODIMP DrawGeometry(_In_ ID2D1Geometry* geometry,
+                            _In_ ID2D1Brush* brush, FLOAT strokeWidth,
+                            _In_opt_ ID2D1StrokeStyle* strokeStyle) {
+    mCtx->DrawGeometry(geometry, brush, strokeWidth, strokeStyle);
+    return S_OK;
+  }
+
+  STDMETHODIMP DrawRectangle(_In_ CONST D2D1_RECT_F* rect,
+                             _In_ ID2D1Brush* brush, FLOAT strokeWidth,
+                             _In_opt_ ID2D1StrokeStyle* strokeStyle) {
+    mCtx->DrawRectangle(rect, brush, strokeWidth, strokeStyle);
+    return S_OK;
+  }
+
+  STDMETHODIMP DrawBitmap(
+      _In_ ID2D1Bitmap* bitmap,
+      _In_opt_ CONST D2D1_RECT_F* destinationRectangle, FLOAT opacity,
+      D2D1_INTERPOLATION_MODE interpolationMode,
+      _In_opt_ CONST D2D1_RECT_F* sourceRectangle,
+      _In_opt_ CONST D2D1_MATRIX_4X4_F* perspectiveTransform) {
+    mCtx->DrawBitmap(bitmap, destinationRectangle, opacity, interpolationMode,
+                     sourceRectangle, perspectiveTransform);
+    return S_OK;
+  }
+
+  STDMETHODIMP DrawImage(_In_ ID2D1Image* image,
+                         _In_opt_ CONST D2D1_POINT_2F* targetOffset,
+                         _In_opt_ CONST D2D1_RECT_F* imageRectangle,
+                         D2D1_INTERPOLATION_MODE interpolationMode,
+                         D2D1_COMPOSITE_MODE compositeMode) {
+    mCtx->DrawImage(image, targetOffset, imageRectangle, interpolationMode,
+                    compositeMode);
+    return S_OK;
+  }
+
+  STDMETHODIMP DrawGdiMetafile(_In_ ID2D1GdiMetafile* gdiMetafile,
+                               _In_opt_ CONST D2D1_POINT_2F* targetOffset) {
+    mCtx->DrawGdiMetafile(gdiMetafile, targetOffset);
+    return S_OK;
+  }
+
+  STDMETHODIMP FillMesh(_In_ ID2D1Mesh* mesh, _In_ ID2D1Brush* brush) {
+    mCtx->FillMesh(mesh, brush);
+    return S_OK;
+  }
+
+  STDMETHODIMP FillOpacityMask(_In_ ID2D1Bitmap* opacityMask,
+                               _In_ ID2D1Brush* brush,
+                               _In_opt_ CONST D2D1_RECT_F* destinationRectangle,
+                               _In_opt_ CONST D2D1_RECT_F* sourceRectangle) {
+    mCtx->FillOpacityMask(opacityMask, brush, destinationRectangle,
+                          sourceRectangle);
+    return S_OK;
+  }
+
+  STDMETHODIMP FillGeometry(_In_ ID2D1Geometry* geometry,
+                            _In_ ID2D1Brush* brush,
+                            _In_opt_ ID2D1Brush* opacityBrush) {
+    mCtx->FillGeometry(geometry, brush, opacityBrush);
+    return S_OK;
+  }
+
+  STDMETHODIMP FillRectangle(_In_ CONST D2D1_RECT_F* rect,
+                             _In_ ID2D1Brush* brush) {
+    mCtx->FillRectangle(rect, brush);
+    return S_OK;
+  }
+
+  STDMETHODIMP PushAxisAlignedClip(_In_ CONST D2D1_RECT_F* clipRect,
+                                   D2D1_ANTIALIAS_MODE antialiasMode) {
+    mCtx->PushAxisAlignedClip(clipRect, antialiasMode);
+    return S_OK;
+  }
+
+  STDMETHODIMP PushLayer(_In_ CONST D2D1_LAYER_PARAMETERS1* layerParameters1,
+                         _In_opt_ ID2D1Layer* layer) {
+    mCtx->PushLayer(layerParameters1, layer);
+    return S_OK;
+  }
+
+  STDMETHODIMP PopAxisAlignedClip() {
+    mCtx->PopAxisAlignedClip();
+    return S_OK;
+  }
+
+  STDMETHODIMP PopLayer() {
+    mCtx->PopLayer();
+    return S_OK;
+  }
+
+  ID2D1DeviceContext* mCtx;
+};
+
+class MOZ_STACK_CLASS AutoRestoreFP final {
+ public:
+  AutoRestoreFP() {
+    // save the current floating point control word
+    _controlfp_s(&savedFPSetting, 0, 0);
+    UINT unused;
+    // set the floating point control word to its default value
+    _controlfp_s(&unused, _CW_DEFAULT, MCW_PC);
+  }
+  ~AutoRestoreFP() {
+    UINT unused;
+    // restore the saved floating point control word
+    _controlfp_s(&unused, savedFPSetting, MCW_PC);
+  }
+
+ private:
+  UINT savedFPSetting;
+};
+
+// Note that overrides of ID2D1SimplifiedGeometrySink methods in this class may
+// get called from D2D with nonstandard floating point settings (see comments in
+// bug 1134549) - use AutoRestoreFP to reset the floating point control word to
+// what we expect
+class StreamingGeometrySink : public ID2D1SimplifiedGeometrySink {
+ public:
+  explicit StreamingGeometrySink(PathSink* aSink) : mSink(aSink) {}
+
+  HRESULT STDMETHODCALLTYPE QueryInterface(const IID& aIID, void** aPtr) {
+    if (!aPtr) {
+      return E_POINTER;
+    }
+
+    if (aIID == IID_IUnknown) {
+      *aPtr = static_cast<IUnknown*>(this);
+      return S_OK;
+    } else if (aIID == IID_ID2D1SimplifiedGeometrySink) {
+      *aPtr = static_cast<ID2D1SimplifiedGeometrySink*>(this);
+      return S_OK;
+    }
+
+    return E_NOINTERFACE;
+  }
+
+  ULONG STDMETHODCALLTYPE AddRef() { return 1; }
+
+  ULONG STDMETHODCALLTYPE Release() { return 1; }
+
+  // We ignore SetFillMode, this depends on the destination sink.
+  STDMETHOD_(void, SetFillMode)(D2D1_FILL_MODE aMode) { return; }
+  STDMETHOD_(void, BeginFigure)
+  (D2D1_POINT_2F aPoint, D2D1_FIGURE_BEGIN aBegin) {
+    AutoRestoreFP resetFloatingPoint;
+    mSink->MoveTo(ToPoint(aPoint));
+  }
+  STDMETHOD_(void, AddLines)(const D2D1_POINT_2F* aLines, UINT aCount) {
+    AutoRestoreFP resetFloatingPoint;
+    for (UINT i = 0; i < aCount; i++) {
+      mSink->LineTo(ToPoint(aLines[i]));
+    }
+  }
+  STDMETHOD_(void, AddBeziers)
+  (const D2D1_BEZIER_SEGMENT* aSegments, UINT aCount) {
+    AutoRestoreFP resetFloatingPoint;
+    for (UINT i = 0; i < aCount; i++) {
+      mSink->BezierTo(ToPoint(aSegments[i].point1),
+                      ToPoint(aSegments[i].point2),
+                      ToPoint(aSegments[i].point3));
+    }
+  }
+  STDMETHOD(Close)() { /* Should never be called! */
+    return S_OK;
+  }
+  STDMETHOD_(void, SetSegmentFlags)
+  (D2D1_PATH_SEGMENT aFlags) { /* Should never be called! */
+  }
+
+  STDMETHOD_(void, EndFigure)(D2D1_FIGURE_END aEnd) {
+    AutoRestoreFP resetFloatingPoint;
+    if (aEnd == D2D1_FIGURE_END_CLOSED) {
+      return mSink->Close();
+    }
+  }
+
+ private:
+  PathSink* mSink;
+};
+
+}  // namespace gfx
+}  // namespace mozilla
+
+#endif /* MOZILLA_GFX_HELPERSD2D_H_ */