third_party/blink/renderer/core/html/canvas/canvas_rendering_context_host.cc

// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "third_party/blink/renderer/core/html/canvas/canvas_rendering_context_host.h"

#include "third_party/blink/renderer/core/html/canvas/canvas_rendering_context.h"
#include "third_party/blink/renderer/platform/graphics/skia/skia_utils.h"
#include "third_party/blink/renderer/platform/graphics/static_bitmap_image.h"
#include "third_party/skia/include/core/SkSurface.h"

namespace blink {

CanvasRenderingContextHost::CanvasRenderingContextHost() = default;

scoped_refptr<StaticBitmapImage>
CanvasRenderingContextHost::CreateTransparentImage(const IntSize& size) const {
  if (!IsValidImageSize(size))
    return nullptr;
  CanvasColorParams color_params = CanvasColorParams();
  if (RenderingContext())
    color_params = RenderingContext()->ColorParams();
  SkImageInfo info = SkImageInfo::Make(
      size.Width(), size.Height(), color_params.GetSkColorType(),
      kPremul_SkAlphaType, color_params.GetSkColorSpaceForSkSurfaces());
  sk_sp<SkSurface> surface =
      SkSurface::MakeRaster(info, info.minRowBytes(), nullptr);
  if (!surface)
    return nullptr;
  return StaticBitmapImage::Create(surface->makeImageSnapshot());
}

bool CanvasRenderingContextHost::IsPaintable() const {
  return (RenderingContext() && RenderingContext()->IsPaintable()) ||
         IsValidImageSize(Size());
}

void CanvasRenderingContextHost::RestoreCanvasMatrixClipStack(
    PaintCanvas* canvas) const {
  if (RenderingContext())
    RenderingContext()->RestoreCanvasMatrixClipStack(canvas);
}

}  // namespace blink