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

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

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

namespace blink {

AcceleratedImageBufferSurface::AcceleratedImageBufferSurface(
    const IntSize& size,
    OpacityMode opacity_mode,
    const CanvasColorParams& color_params)
    : ImageBufferSurface(size, opacity_mode, color_params) {
  if (!SharedGpuContext::IsValid())
    return;
  GrContext* gr_context = SharedGpuContext::Gr();
  context_id_ = SharedGpuContext::ContextId();
  CHECK(gr_context);

  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::MakeRenderTarget(
      gr_context, SkBudgeted::kYes, info, 0 /* sampleCount */,
      kOpaque == opacity_mode ? nullptr : &disable_lcd_props);
  if (!surface_)
    return;

  canvas_ = WTF::WrapUnique(new SkiaPaintCanvas(
      surface_->getCanvas(),
      RuntimeEnabledFeatures::colorCorrectRenderingEnabled() &&
              color_params.UsesOutputSpaceBlending()
          ? color_params.GetSkColorSpace()
          : nullptr));
  Clear();

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

bool AcceleratedImageBufferSurface::IsValid() const {
  return surface_ && SharedGpuContext::IsValid() &&
         context_id_ == SharedGpuContext::ContextId();
}

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

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