third_party/WebKit/Source/platform/graphics/gpu/AcceleratedImageBufferSurface.cpp

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#include "platform/graphics/gpu/AcceleratedImageBufferSurface.h"

#include "platform/graphics/gpu/SharedGpuContext.h"
#include "platform/graphics/skia/SkiaUtils.h"
#include "skia/ext/texture_handle.h"
#include "third_party/skia/include/gpu/GrContext.h"
#include "wtf/PtrUtil.h"
#include "wtf/RefPtr.h"

namespace blink {

AcceleratedImageBufferSurface::AcceleratedImageBufferSurface(
    const IntSize& size,
    OpacityMode opacityMode,
    sk_sp<SkColorSpace> colorSpace,
    SkColorType colorType)
    : ImageBufferSurface(size, opacityMode, colorSpace, colorType) {
  if (!SharedGpuContext::isValid())
    return;
  GrContext* grContext = SharedGpuContext::gr();
  m_contextId = SharedGpuContext::contextId();
  CHECK(grContext);

  SkAlphaType alphaType =
      (Opaque == opacityMode) ? kOpaque_SkAlphaType : kPremul_SkAlphaType;
  SkImageInfo info = SkImageInfo::Make(size.width(), size.height(), colorType,
                                       alphaType, colorSpace);
  SkSurfaceProps disableLCDProps(0, kUnknown_SkPixelGeometry);
  m_surface = SkSurface::MakeRenderTarget(
      grContext, SkBudgeted::kYes, info, 0 /* sampleCount */,
      Opaque == opacityMode ? nullptr : &disableLCDProps);
  if (!m_surface)
    return;
  clear();

  // Always save an initial frame, to support resetting the top level matrix
  // and clip.
  m_surface->getCanvas()->save();
}

bool AcceleratedImageBufferSurface::isValid() const {
  return m_surface && SharedGpuContext::isValid() &&
         m_contextId == SharedGpuContext::contextId();
}

sk_sp<SkImage> AcceleratedImageBufferSurface::newImageSnapshot(AccelerationHint,
                                                               SnapshotReason) {
  return m_surface->makeImageSnapshot();
}

GLuint AcceleratedImageBufferSurface::getBackingTextureHandleForOverwrite() {
  if (!m_surface)
    return 0;
  return skia::GrBackendObjectToGrGLTextureInfo(
             m_surface->getTextureHandle(
                 SkSurface::kDiscardWrite_TextureHandleAccess))
      ->fID;
}

}  // namespace blink