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

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

#include "base/memory/scoped_refptr.h"
#include "platform/graphics/AcceleratedStaticBitmapImage.h"
#include "platform/graphics/gpu/SharedGpuContext.h"
#include "platform/graphics/skia/SkiaUtils.h"
#include "platform/runtime_enabled_features.h"
#include "platform/wtf/PtrUtil.h"
#include "skia/ext/texture_handle.h"
#include "third_party/skia/include/gpu/GrContext.h"

namespace blink {

AcceleratedImageBufferSurface::AcceleratedImageBufferSurface(
    const IntSize& size,
    const CanvasColorParams& color_params)
    : ImageBufferSurface(size, color_params) {
  context_provider_wrapper_ = SharedGpuContext::ContextProviderWrapper();
  if (!context_provider_wrapper_)
    return;
  GrContext* gr_context =
      context_provider_wrapper_->ContextProvider()->GetGrContext();

  CHECK(gr_context);

  SkImageInfo info = SkImageInfo::Make(
      size.Width(), size.Height(), color_params.GetSkColorType(),
      color_params.GetSkAlphaType(),
      color_params.GetSkColorSpaceForSkSurfaces());
  surface_ = SkSurface::MakeRenderTarget(gr_context, SkBudgeted::kYes, info,
                                         0 /* sampleCount */,
                                         color_params.GetSkSurfaceProps());
  if (!surface_)
    return;

  canvas_ = color_params.WrapCanvas(surface_->getCanvas());
  Clear();

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

bool AcceleratedImageBufferSurface::IsValid() const {
  // Note: SharedGpuContext::ContextProviderWrapper() is called in order to
  // actively detect not-yet-handled context losses.
  return surface_ && context_provider_wrapper_;
}

scoped_refptr<StaticBitmapImage>
AcceleratedImageBufferSurface::NewImageSnapshot(AccelerationHint,
                                                SnapshotReason) {
  if (!IsValid())
    return nullptr;
  // Must make a copy of the WeakPtr because CreateFromSkImage only takes
  // r-value references.
  base::WeakPtr<WebGraphicsContext3DProviderWrapper> context_provider_wrapper =
      context_provider_wrapper_;
  scoped_refptr<AcceleratedStaticBitmapImage> image =
      AcceleratedStaticBitmapImage::CreateFromSkImage(
          surface_->makeImageSnapshot(), std::move(context_provider_wrapper));
  image->RetainOriginalSkImageForCopyOnWrite();
  return image;
}

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

bool AcceleratedImageBufferSurface::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);
}

}  // namespace blink