gecko-dev/gfx/2d/SourceSurfaceCairo.cpp

/* -*- 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 "SourceSurfaceCairo.h"
#include "DrawTargetCairo.h"
#include "HelpersCairo.h"
#include "DataSourceSurfaceWrapper.h"

#include "cairo.h"

namespace mozilla {
namespace gfx {

static SurfaceFormat
CairoFormatToSurfaceFormat(cairo_format_t format)
{
  switch (format)
  {
    case CAIRO_FORMAT_ARGB32:
      return SurfaceFormat::B8G8R8A8;
    case CAIRO_FORMAT_RGB24:
      return SurfaceFormat::B8G8R8X8;
    case CAIRO_FORMAT_A8:
      return SurfaceFormat::A8;
    default:
      return SurfaceFormat::B8G8R8A8;
  }
}

SourceSurfaceCairo::SourceSurfaceCairo(cairo_surface_t* aSurface,
                                       const IntSize& aSize,
                                       const SurfaceFormat& aFormat,
                                       DrawTargetCairo* aDrawTarget /* = nullptr */)
 : mSize(aSize)
 , mFormat(aFormat)
 , mSurface(aSurface)
 , mDrawTarget(aDrawTarget)
{
  cairo_surface_reference(mSurface);
}

SourceSurfaceCairo::~SourceSurfaceCairo()
{
  cairo_surface_destroy(mSurface);
}

IntSize
SourceSurfaceCairo::GetSize() const
{
  return mSize;
}

SurfaceFormat
SourceSurfaceCairo::GetFormat() const
{
  return mFormat;
}

already_AddRefed<DataSourceSurface>
SourceSurfaceCairo::GetDataSurface()
{
  RefPtr<DataSourceSurface> dataSurf;

  if (cairo_surface_get_type(mSurface) == CAIRO_SURFACE_TYPE_IMAGE) {
    dataSurf = new DataSourceSurfaceCairo(mSurface);
  } else {
    cairo_surface_t* imageSurf = cairo_image_surface_create(GfxFormatToCairoFormat(mFormat),
                                                            mSize.width, mSize.height);

    // Fill the new image surface with the contents of our surface.
    cairo_t* ctx = cairo_create(imageSurf);
    cairo_set_source_surface(ctx, mSurface, 0, 0);
    cairo_paint(ctx);
    cairo_destroy(ctx);

    dataSurf = new DataSourceSurfaceCairo(imageSurf);
    cairo_surface_destroy(imageSurf);
  }

  // We also need to make sure that the returned surface has
  // surface->GetType() == SurfaceType::DATA.
  return MakeAndAddRef<DataSourceSurfaceWrapper>(dataSurf);
}

cairo_surface_t*
SourceSurfaceCairo::GetSurface() const
{
  return mSurface;
}

void
SourceSurfaceCairo::DrawTargetWillChange()
{
  if (mDrawTarget) {
    mDrawTarget = nullptr;

    // We're about to lose our version of the surface, so make a copy of it.
    cairo_surface_t* surface = cairo_surface_create_similar(mSurface,
                                                            GfxFormatToCairoContent(mFormat),
                                                            mSize.width, mSize.height);
    cairo_t* ctx = cairo_create(surface);
    cairo_pattern_t* pat = cairo_pattern_create_for_surface(mSurface);
    cairo_set_source(ctx, pat);
    cairo_paint(ctx);
    cairo_destroy(ctx);
    cairo_pattern_destroy(pat);

    // Swap in this new surface.
    cairo_surface_destroy(mSurface);
    mSurface = surface;
  }
}

DataSourceSurfaceCairo::DataSourceSurfaceCairo(cairo_surface_t* imageSurf)
 : mImageSurface(imageSurf)
{
  cairo_surface_reference(mImageSurface);
}

DataSourceSurfaceCairo::~DataSourceSurfaceCairo()
{
  cairo_surface_destroy(mImageSurface);
}

unsigned char *
DataSourceSurfaceCairo::GetData()
{
  return cairo_image_surface_get_data(mImageSurface);
}

int32_t
DataSourceSurfaceCairo::Stride()
{
  return cairo_image_surface_get_stride(mImageSurface);
}

IntSize
DataSourceSurfaceCairo::GetSize() const
{
  IntSize size;
  size.width = cairo_image_surface_get_width(mImageSurface);
  size.height = cairo_image_surface_get_height(mImageSurface);

  return size;
}

SurfaceFormat
DataSourceSurfaceCairo::GetFormat() const
{
  return CairoFormatToSurfaceFormat(cairo_image_surface_get_format(mImageSurface));
}

cairo_surface_t*
DataSourceSurfaceCairo::GetSurface() const
{
  return mImageSurface;
}

} // namespace gfx
} // namespace mozilla