third_party/WebKit/Source/platform/graphics/UnacceleratedImageBufferSurface.cpp

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#include "platform/graphics/UnacceleratedImageBufferSurface.h"

#include "platform/graphics/skia/SkiaUtils.h"
#include "platform/wtf/PassRefPtr.h"
#include "third_party/skia/include/core/SkSurface.h"

namespace blink {

UnacceleratedImageBufferSurface::UnacceleratedImageBufferSurface(
    const IntSize& size,
    OpacityMode opacity_mode,
    ImageInitializationMode initialization_mode,
    const CanvasColorParams& color_params)
    : ImageBufferSurface(size, opacity_mode, color_params) {
  SkAlphaType alpha_type =
      (kOpaque == opacity_mode) ? kOpaque_SkAlphaType : kPremul_SkAlphaType;
  SkImageInfo info = SkImageInfo::Make(
      size.Width(), size.Height(), color_params.GetSkColorType(), alpha_type,
      color_params.GetSkColorSpaceForSkSurfaces());
  SkSurfaceProps disable_lcd_props(0, kUnknown_SkPixelGeometry);
  surface_ = SkSurface::MakeRaster(
      info, kOpaque == opacity_mode ? 0 : &disable_lcd_props);

  if (!surface_)
    return;

  // Always save an initial frame, to support resetting the top level matrix
  // and clip.
  canvas_ = WTF::WrapUnique(new SkiaPaintCanvas(surface_->getCanvas()));
  canvas_->save();

  if (initialization_mode == kInitializeImagePixels)
    Clear();
}

UnacceleratedImageBufferSurface::~UnacceleratedImageBufferSurface() {}

PaintCanvas* UnacceleratedImageBufferSurface::Canvas() {
  return canvas_.get();
}

bool UnacceleratedImageBufferSurface::IsValid() const {
  return surface_;
}

bool UnacceleratedImageBufferSurface::WritePixels(const SkImageInfo& orig_info,
                                                  const void* pixels,
                                                  size_t row_bytes,
                                                  int x,
                                                  int y) {
  return surface_->getCanvas()->writePixels(orig_info, pixels, row_bytes, x, y);
}

sk_sp<SkImage> UnacceleratedImageBufferSurface::NewImageSnapshot(
    AccelerationHint,
    SnapshotReason) {
  return surface_->makeImageSnapshot();
}

}  // namespace blink