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

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#include "platform/graphics/ImageBufferSurface.h"

#include "platform/graphics/GraphicsContext.h"
#include "platform/graphics/ImageBuffer.h"
#include "platform/graphics/StaticBitmapImage.h"
#include "third_party/skia/include/core/SkColorSpace.h"
#include "third_party/skia/include/core/SkImage.h"


namespace blink {

ImageBufferSurface::ImageBufferSurface(const IntSize& size,
                                       const CanvasColorParams& color_params)
    : size_(size), color_params_(color_params) {
  SetIsHidden(false);
}

ImageBufferSurface::~ImageBufferSurface() {}

sk_sp<PaintRecord> ImageBufferSurface::GetRecord() {
  return nullptr;
}

void ImageBufferSurface::Clear() {
  // Clear the background transparent or opaque, as required. It would be nice
  // if this wasn't required, but the canvas is currently filled with the magic
  // transparency color. Can we have another way to manage this?
  if (IsValid()) {
    if (color_params_.GetOpacityMode() == kOpaque) {
      Canvas()->clear(SK_ColorBLACK);
    } else {
      Canvas()->clear(SK_ColorTRANSPARENT);
    }
    DidDraw(FloatRect(FloatPoint(0, 0), FloatSize(Size())));
  }
}

void ImageBufferSurface::Draw(GraphicsContext& context,
                              const FloatRect& dest_rect,
                              const FloatRect& src_rect,
                              SkBlendMode op) {
  scoped_refptr<StaticBitmapImage> snapshot =
      NewImageSnapshot(kPreferAcceleration, kSnapshotReasonPaint);
  if (!snapshot)
    return;

  // GraphicsContext cannot handle gpu resource serialization.
  snapshot = snapshot->MakeUnaccelerated();

  DCHECK(!snapshot->IsTextureBacked());
  context.DrawImage(snapshot.get(), Image::kSyncDecode, dest_rect, &src_rect,
                    op);
}

void ImageBufferSurface::Flush(FlushReason) {
  Canvas()->flush();
}

}  // namespace blink