diff -r 000000000000 -r 6474c204b198 gfx/thebes/gfxPattern.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/thebes/gfxPattern.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,488 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gfxTypes.h"
+#include "gfxPattern.h"
+#include "gfxASurface.h"
+#include "gfxPlatform.h"
+#include "gfx2DGlue.h"
+#include "gfxGradientCache.h"
+
+#include "cairo.h"
+
+#include <vector>
+
+using namespace mozilla::gfx;
+
+gfxPattern::gfxPattern(cairo_pattern_t *aPattern)
+  : mGfxPattern(nullptr)
+{
+    mPattern = cairo_pattern_reference(aPattern);
+}
+
+gfxPattern::gfxPattern(const gfxRGBA& aColor)
+  : mGfxPattern(nullptr)
+{
+    mPattern = cairo_pattern_create_rgba(aColor.r, aColor.g, aColor.b, aColor.a);
+}
+
+// from another surface
+gfxPattern::gfxPattern(gfxASurface *surface)
+  : mGfxPattern(nullptr)
+{
+    mPattern = cairo_pattern_create_for_surface(surface->CairoSurface());
+}
+
+// linear
+gfxPattern::gfxPattern(gfxFloat x0, gfxFloat y0, gfxFloat x1, gfxFloat y1)
+  : mGfxPattern(nullptr)
+{
+    mPattern = cairo_pattern_create_linear(x0, y0, x1, y1);
+}
+
+// radial
+gfxPattern::gfxPattern(gfxFloat cx0, gfxFloat cy0, gfxFloat radius0,
+                       gfxFloat cx1, gfxFloat cy1, gfxFloat radius1)
+  : mGfxPattern(nullptr)
+{
+    mPattern = cairo_pattern_create_radial(cx0, cy0, radius0,
+                                           cx1, cy1, radius1);
+}
+
+// Azure
+gfxPattern::gfxPattern(SourceSurface *aSurface, const Matrix &aTransform)
+  : mPattern(nullptr)
+  , mGfxPattern(nullptr)
+  , mSourceSurface(aSurface)
+  , mTransform(aTransform)
+  , mExtend(EXTEND_NONE)
+{
+}
+
+gfxPattern::~gfxPattern()
+{
+    cairo_pattern_destroy(mPattern);
+
+    if (mGfxPattern) {
+      mGfxPattern->~Pattern();
+    }
+}
+
+cairo_pattern_t *
+gfxPattern::CairoPattern()
+{
+    return mPattern;
+}
+
+void
+gfxPattern::AddColorStop(gfxFloat offset, const gfxRGBA& c)
+{
+  if (mPattern) {
+    mStops = nullptr;
+    if (gfxPlatform::GetCMSMode() == eCMSMode_All) {
+        gfxRGBA cms;
+        qcms_transform *transform = gfxPlatform::GetCMSRGBTransform();
+        if (transform)
+          gfxPlatform::TransformPixel(c, cms, transform);
+
+        // Use the original alpha to avoid unnecessary float->byte->float
+        // conversion errors
+        cairo_pattern_add_color_stop_rgba(mPattern, offset,
+                                          cms.r, cms.g, cms.b, c.a);
+    }
+    else
+        cairo_pattern_add_color_stop_rgba(mPattern, offset, c.r, c.g, c.b, c.a);
+  }
+}
+
+void
+gfxPattern::SetColorStops(mozilla::RefPtr<mozilla::gfx::GradientStops> aStops)
+{
+  mStops = aStops;
+}
+
+void
+gfxPattern::CacheColorStops(mozilla::gfx::DrawTarget *aDT)
+{
+  if (mPattern) {
+    mStops = nullptr;
+    nsTArray<GradientStop> stops;
+    int count = 0;
+    cairo_pattern_get_color_stop_count(mPattern, &count);
+    stops.SetLength(count);
+    for (int n = 0; n < count; ++n) {
+      double offset, r, g, b, a;
+      cairo_pattern_get_color_stop_rgba(mPattern, n, &offset, &r, &g, &b, &a);
+      stops[n].color = mozilla::gfx::Color(r, g, b, a);
+      stops[n].offset = offset;
+    }
+    mStops = gfxGradientCache::GetOrCreateGradientStops(aDT,
+                                                        stops,
+                                                        (cairo_pattern_get_extend(mPattern) == CAIRO_EXTEND_REPEAT)
+                                                        ? mozilla::gfx::ExtendMode::REPEAT
+                                                        : mozilla::gfx::ExtendMode::CLAMP);
+  }
+}
+
+void
+gfxPattern::SetMatrix(const gfxMatrix& matrix)
+{
+  if (mPattern) {
+    cairo_matrix_t mat = *reinterpret_cast<const cairo_matrix_t*>(&matrix);
+    cairo_pattern_set_matrix(mPattern, &mat);
+  } else {
+    mTransform = ToMatrix(matrix);
+    // Cairo-pattern matrices specify the conversion from DrawTarget to pattern
+    // space. Azure pattern matrices specify the conversion from pattern to
+    // DrawTarget space.
+    mTransform.Invert();
+  }
+}
+
+gfxMatrix
+gfxPattern::GetMatrix() const
+{
+  if (mPattern) {
+    cairo_matrix_t mat;
+    cairo_pattern_get_matrix(mPattern, &mat);
+    return gfxMatrix(*reinterpret_cast<gfxMatrix*>(&mat));
+  } else {
+    // invert at the higher precision of gfxMatrix
+    // cause we need to convert at some point anyways
+    gfxMatrix mat = ThebesMatrix(mTransform);
+    mat.Invert();
+    return mat;
+  }
+}
+
+gfxMatrix
+gfxPattern::GetInverseMatrix() const
+{
+  if (mPattern) {
+    cairo_matrix_t mat;
+    cairo_pattern_get_matrix(mPattern, &mat);
+    cairo_matrix_invert(&mat);
+    return gfxMatrix(*reinterpret_cast<gfxMatrix*>(&mat));
+  } else {
+    return ThebesMatrix(mTransform);
+  }
+}
+
+Pattern*
+gfxPattern::GetPattern(DrawTarget *aTarget, Matrix *aPatternTransform)
+{
+  if (mGfxPattern) {
+    mGfxPattern->~Pattern();
+    mGfxPattern = nullptr;
+  }
+
+  if (!mPattern) {
+    Matrix adjustedMatrix = mTransform;
+    if (aPatternTransform)
+      AdjustTransformForPattern(adjustedMatrix, aTarget->GetTransform(), aPatternTransform);
+    mGfxPattern = new (mSurfacePattern.addr())
+      SurfacePattern(mSourceSurface, ToExtendMode(mExtend), adjustedMatrix, mFilter);
+    return mGfxPattern;
+  }
+
+  GraphicsExtend extend = (GraphicsExtend)cairo_pattern_get_extend(mPattern);
+
+  switch (cairo_pattern_get_type(mPattern)) {
+  case CAIRO_PATTERN_TYPE_SOLID:
+    {
+      double r, g, b, a;
+      cairo_pattern_get_rgba(mPattern, &r, &g, &b, &a);
+
+      new (mColorPattern.addr()) ColorPattern(Color(r, g, b, a));
+      return mColorPattern.addr();
+    }
+  case CAIRO_PATTERN_TYPE_SURFACE:
+    {
+      GraphicsFilter filter = (GraphicsFilter)cairo_pattern_get_filter(mPattern);
+      cairo_matrix_t mat;
+      cairo_pattern_get_matrix(mPattern, &mat);
+      gfxMatrix matrix(*reinterpret_cast<gfxMatrix*>(&mat));
+
+      cairo_surface_t *surf = nullptr;
+      cairo_pattern_get_surface(mPattern, &surf);
+
+      if (!mSourceSurface) {
+        nsRefPtr<gfxASurface> gfxSurf = gfxASurface::Wrap(surf);
+        // The underlying surface here will be kept around by the gfxPattern.
+        // This function is intended to be used right away.
+        mSourceSurface =
+          gfxPlatform::GetPlatform()->GetSourceSurfaceForSurface(aTarget, gfxSurf);
+      }
+
+      if (mSourceSurface) {
+        Matrix newMat = ToMatrix(matrix);
+
+        AdjustTransformForPattern(newMat, aTarget->GetTransform(), aPatternTransform);
+
+        double x, y;
+        cairo_surface_get_device_offset(surf, &x, &y);
+        newMat.Translate(-x, -y);
+        mGfxPattern = new (mSurfacePattern.addr())
+          SurfacePattern(mSourceSurface, ToExtendMode(extend), newMat, ToFilter(filter));
+        return mGfxPattern;
+      }
+      break;
+    }
+  case CAIRO_PATTERN_TYPE_LINEAR:
+    {
+      double x1, y1, x2, y2;
+      cairo_pattern_get_linear_points(mPattern, &x1, &y1, &x2, &y2);
+      if (!mStops) {
+        int count = 0;
+        cairo_pattern_get_color_stop_count(mPattern, &count);
+
+        std::vector<GradientStop> stops;
+
+        for (int i = 0; i < count; i++) {
+          GradientStop stop;
+          double r, g, b, a, offset;
+          cairo_pattern_get_color_stop_rgba(mPattern, i, &offset, &r, &g, &b, &a);
+
+          stop.offset = offset;
+          stop.color = Color(Float(r), Float(g), Float(b), Float(a));
+          stops.push_back(stop);
+        }
+
+        mStops = aTarget->CreateGradientStops(&stops.front(), count, ToExtendMode(extend));
+      }
+
+      if (mStops) {
+        cairo_matrix_t mat;
+        cairo_pattern_get_matrix(mPattern, &mat);
+        gfxMatrix matrix(*reinterpret_cast<gfxMatrix*>(&mat));
+
+        Matrix newMat = ToMatrix(matrix);
+
+        AdjustTransformForPattern(newMat, aTarget->GetTransform(), aPatternTransform);
+
+        mGfxPattern = new (mLinearGradientPattern.addr())
+          LinearGradientPattern(Point(x1, y1), Point(x2, y2), mStops, newMat);
+
+        return mGfxPattern;
+      }
+      break;
+    }
+  case CAIRO_PATTERN_TYPE_RADIAL:
+    {
+      if (!mStops) {
+        int count = 0;
+        cairo_pattern_get_color_stop_count(mPattern, &count);
+
+        std::vector<GradientStop> stops;
+
+        for (int i = 0; i < count; i++) {
+          GradientStop stop;
+          double r, g, b, a, offset;
+          cairo_pattern_get_color_stop_rgba(mPattern, i, &offset, &r, &g, &b, &a);
+
+          stop.offset = offset;
+          stop.color = Color(Float(r), Float(g), Float(b), Float(a));
+          stops.push_back(stop);
+        }
+
+        mStops = aTarget->CreateGradientStops(&stops.front(), count, ToExtendMode(extend));
+      }
+
+      if (mStops) {
+        cairo_matrix_t mat;
+        cairo_pattern_get_matrix(mPattern, &mat);
+        gfxMatrix matrix(*reinterpret_cast<gfxMatrix*>(&mat));
+
+        Matrix newMat = ToMatrix(matrix);
+
+        AdjustTransformForPattern(newMat, aTarget->GetTransform(), aPatternTransform);
+
+        double x1, y1, x2, y2, r1, r2;
+        cairo_pattern_get_radial_circles(mPattern, &x1, &y1, &r1, &x2, &y2, &r2);
+        mGfxPattern = new (mRadialGradientPattern.addr())
+          RadialGradientPattern(Point(x1, y1), Point(x2, y2), r1, r2, mStops, newMat);
+
+        return mGfxPattern;
+      }
+      break;
+    }
+  default:
+    /* Reassure the compiler we are handling all the enum values.  */
+    break;
+  }
+
+  new (mColorPattern.addr()) ColorPattern(Color(0, 0, 0, 0));
+  return mColorPattern.addr();
+}
+
+void
+gfxPattern::SetExtend(GraphicsExtend extend)
+{
+  if (mPattern) {
+    mStops = nullptr;
+    if (extend == EXTEND_PAD_EDGE) {
+        if (cairo_pattern_get_type(mPattern) == CAIRO_PATTERN_TYPE_SURFACE) {
+            cairo_surface_t *surf = nullptr;
+
+            cairo_pattern_get_surface (mPattern, &surf);
+            if (surf) {
+                switch (cairo_surface_get_type(surf)) {
+                    case CAIRO_SURFACE_TYPE_WIN32_PRINTING:
+                    case CAIRO_SURFACE_TYPE_QUARTZ:
+                        extend = EXTEND_NONE;
+                        break;
+
+                    case CAIRO_SURFACE_TYPE_WIN32:
+                    case CAIRO_SURFACE_TYPE_XLIB:
+                    default:
+                        extend = EXTEND_PAD;
+                        break;
+                }
+            }
+        }
+
+        // if something went wrong, or not a surface pattern, use PAD
+        if (extend == EXTEND_PAD_EDGE)
+            extend = EXTEND_PAD;
+    }
+
+    cairo_pattern_set_extend(mPattern, (cairo_extend_t)extend);
+  } else {
+    // This is always a surface pattern and will default to EXTEND_PAD
+    // for EXTEND_PAD_EDGE.
+    mExtend = extend;
+  }
+}
+
+bool
+gfxPattern::IsOpaque()
+{
+  if (mPattern) {
+    switch (cairo_pattern_get_type(mPattern)) {
+    case CAIRO_PATTERN_TYPE_SURFACE:
+      {
+        cairo_surface_t *surf = nullptr;
+        cairo_pattern_get_surface(mPattern, &surf);
+
+        if (cairo_surface_get_content(surf) == CAIRO_CONTENT_COLOR) {
+          return true;
+        }
+      }
+    default:
+      return false;
+    }
+  }
+
+  if (mSourceSurface->GetFormat() == SurfaceFormat::B8G8R8X8) {
+    return true;
+  }
+  return false;
+}
+
+gfxPattern::GraphicsExtend
+gfxPattern::Extend() const
+{
+  if (mPattern) {
+    return (GraphicsExtend)cairo_pattern_get_extend(mPattern);
+  } else {
+    return mExtend;
+  }
+}
+
+void
+gfxPattern::SetFilter(GraphicsFilter filter)
+{
+  if (mPattern) {
+    cairo_pattern_set_filter(mPattern, (cairo_filter_t)(int)filter);
+  } else {
+    mFilter = ToFilter(filter);
+  }
+}
+
+GraphicsFilter
+gfxPattern::Filter() const
+{
+  if (mPattern) {
+    return (GraphicsFilter)cairo_pattern_get_filter(mPattern);
+  } else {
+    return ThebesFilter(mFilter);
+  }
+}
+
+bool
+gfxPattern::GetSolidColor(gfxRGBA& aColor)
+{
+    return cairo_pattern_get_rgba(mPattern,
+                                  &aColor.r,
+                                  &aColor.g,
+                                  &aColor.b,
+                                  &aColor.a) == CAIRO_STATUS_SUCCESS;
+}
+
+already_AddRefed<gfxASurface>
+gfxPattern::GetSurface()
+{
+  if (mPattern) {
+    cairo_surface_t *surf = nullptr;
+
+    if (cairo_pattern_get_surface (mPattern, &surf) != CAIRO_STATUS_SUCCESS)
+        return nullptr;
+
+    return gfxASurface::Wrap(surf);
+  } else {
+    // We should never be trying to get the surface off an Azure gfx Pattern.
+    NS_ERROR("Attempt to get surface off an Azure gfxPattern!");
+    return nullptr;
+  }
+}
+
+gfxPattern::GraphicsPatternType
+gfxPattern::GetType() const
+{
+  if (mPattern) {
+    return (GraphicsPatternType) cairo_pattern_get_type(mPattern);
+  } else {
+    // We should never be trying to get the type off an Azure gfx Pattern.
+    MOZ_ASSERT(0);
+    return PATTERN_SURFACE;
+  }
+}
+
+int
+gfxPattern::CairoStatus()
+{
+  if (mPattern) {
+    return cairo_pattern_status(mPattern);
+  } else {
+    // An Azure pattern as this point is never in error status.
+    return CAIRO_STATUS_SUCCESS;
+  }
+}
+
+void
+gfxPattern::AdjustTransformForPattern(Matrix &aPatternTransform,
+                                      const Matrix &aCurrentTransform,
+                                      const Matrix *aOriginalTransform)
+{
+  aPatternTransform.Invert();
+  if (!aOriginalTransform) {
+    // User space is unchanged, so to get from pattern space to user space,
+    // just invert the cairo matrix.
+    aPatternTransform.NudgeToIntegers();
+    return;
+  }
+  // aPatternTransform now maps from pattern space to the user space defined
+  // by *aOriginalTransform.
+
+  Matrix mat = aCurrentTransform;
+  mat.Invert();
+  // mat maps from device space to current user space
+
+  // First, transform from pattern space to original user space. Then transform
+  // from original user space to device space. Then transform from
+  // device space to current user space.
+  aPatternTransform = aPatternTransform * *aOriginalTransform * mat;
+  aPatternTransform.NudgeToIntegers();
+}