gfx/2d/SourceSurfaceCairo.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "SourceSurfaceCairo.h"
   8 #include "DrawTargetCairo.h"
   9 #include "HelpersCairo.h"
  10 #include "DataSourceSurfaceWrapper.h"
  11
  12 #include "cairo.h"
  13
  14 namespace mozilla {
  15 namespace gfx {
  16
  17 static SurfaceFormat CairoFormatToSurfaceFormat(cairo_format_t format) {
  18   switch (format) {
  19     case CAIRO_FORMAT_ARGB32:
  20       return SurfaceFormat::B8G8R8A8;
  21     case CAIRO_FORMAT_RGB24:
  22       return SurfaceFormat::B8G8R8X8;
  23     case CAIRO_FORMAT_RGB16_565:
  24       return SurfaceFormat::R5G6B5_UINT16;
  25     case CAIRO_FORMAT_A8:
  26       return SurfaceFormat::A8;
  27     default:
  28       return SurfaceFormat::B8G8R8A8;
  29   }
  30 }
  31
  32 SourceSurfaceCairo::SourceSurfaceCairo(
  33     cairo_surface_t* aSurface, const IntSize& aSize,
  34     const SurfaceFormat& aFormat, DrawTargetCairo* aDrawTarget /* = nullptr */)
  35     : mSize(aSize),
  36       mFormat(aFormat),
  37       mSurface(aSurface),
  38       mDrawTarget(aDrawTarget) {
  39   cairo_surface_reference(mSurface);
  40 }
  41
  42 SourceSurfaceCairo::~SourceSurfaceCairo() { cairo_surface_destroy(mSurface); }
  43
  44 IntSize SourceSurfaceCairo::GetSize() const { return mSize; }
  45
  46 SurfaceFormat SourceSurfaceCairo::GetFormat() const { return mFormat; }
  47
  48 already_AddRefed<DataSourceSurface> SourceSurfaceCairo::GetDataSurface() {
  49   RefPtr<DataSourceSurface> dataSurf;
  50
  51   if (cairo_surface_get_type(mSurface) == CAIRO_SURFACE_TYPE_IMAGE) {
  52     dataSurf = new DataSourceSurfaceCairo(mSurface);
  53   } else {
  54     cairo_surface_t* imageSurf = cairo_image_surface_create(
  55         GfxFormatToCairoFormat(mFormat), mSize.width, mSize.height);
  56
  57     // Fill the new image surface with the contents of our surface.
  58     cairo_t* ctx = cairo_create(imageSurf);
  59     cairo_set_source_surface(ctx, mSurface, 0, 0);
  60     cairo_paint(ctx);
  61     cairo_destroy(ctx);
  62
  63     dataSurf = new DataSourceSurfaceCairo(imageSurf);
  64     cairo_surface_destroy(imageSurf);
  65   }
  66
  67   // We also need to make sure that the returned surface has
  68   // surface->GetType() == SurfaceType::DATA.
  69   return MakeAndAddRef<DataSourceSurfaceWrapper>(dataSurf);
  70 }
  71
  72 cairo_surface_t* SourceSurfaceCairo::GetSurface() const { return mSurface; }
  73
  74 void SourceSurfaceCairo::DrawTargetWillChange() {
  75   if (mDrawTarget) {
  76     mDrawTarget = nullptr;
  77
  78     // We're about to lose our version of the surface, so make a copy of it.
  79     cairo_surface_t* surface = cairo_surface_create_similar(
  80         mSurface, GfxFormatToCairoContent(mFormat), mSize.width, mSize.height);
  81     cairo_t* ctx = cairo_create(surface);
  82     cairo_pattern_t* pat = cairo_pattern_create_for_surface(mSurface);
  83     cairo_set_source(ctx, pat);
  84     cairo_paint(ctx);
  85     cairo_destroy(ctx);
  86     cairo_pattern_destroy(pat);
  87
  88     // Swap in this new surface.
  89     cairo_surface_destroy(mSurface);
  90     mSurface = surface;
  91   }
  92 }
  93
  94 DataSourceSurfaceCairo::DataSourceSurfaceCairo(cairo_surface_t* imageSurf)
  95     : mImageSurface(imageSurf) {
  96   cairo_surface_reference(mImageSurface);
  97 }
  98
  99 DataSourceSurfaceCairo::~DataSourceSurfaceCairo() {
 100   cairo_surface_destroy(mImageSurface);
 101 }
 102
 103 unsigned char* DataSourceSurfaceCairo::GetData() {
 104   return cairo_image_surface_get_data(mImageSurface);
 105 }
 106
 107 int32_t DataSourceSurfaceCairo::Stride() {
 108   return cairo_image_surface_get_stride(mImageSurface);
 109 }
 110
 111 IntSize DataSourceSurfaceCairo::GetSize() const {
 112   IntSize size;
 113   size.width = cairo_image_surface_get_width(mImageSurface);
 114   size.height = cairo_image_surface_get_height(mImageSurface);
 115
 116   return size;
 117 }
 118
 119 SurfaceFormat DataSourceSurfaceCairo::GetFormat() const {
 120   return CairoFormatToSurfaceFormat(
 121       cairo_image_surface_get_format(mImageSurface));
 122 }
 123
 124 cairo_surface_t* DataSourceSurfaceCairo::GetSurface() const {
 125   return mImageSurface;
 126 }
 127
 128 }  // namespace gfx
 129 }  // namespace mozilla