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// Copyright 2019 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.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_MEMORY_MANAGED_PAINT_CANVAS_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_MEMORY_MANAGED_PAINT_CANVAS_H_
#include <memory>
#include "cc/paint/record_paint_canvas.h"
#include "third_party/blink/public/platform/platform.h"
namespace blink {
// MemoryManagedPaintCanvas overrides the potentially memory intensive image
// drawing methods of PaintCanvas and keeps track of how much memory is
// being pinned between flushes. This allows the rendering context to flush if
// too much memory is used.
class PLATFORM_EXPORT MemoryManagedPaintCanvas final
: public cc::RecordPaintCanvas {
public:
MemoryManagedPaintCanvas(cc::DisplayItemList* list,
const SkRect& bounds,
base::RepeatingClosure set_needs_flush_callback);
explicit MemoryManagedPaintCanvas(const cc::RecordPaintCanvas&) = delete;
~MemoryManagedPaintCanvas() override;
void drawImage(const cc::PaintImage& image,
SkScalar left,
SkScalar top,
const cc::PaintFlags* flags) override;
void drawImageRect(const cc::PaintImage& image,
const SkRect& src,
const SkRect& dst,
const cc::PaintFlags* flags,
SrcRectConstraint constraint) override;
private:
void UpdateMemoryUsage(const cc::PaintImage& image);
base::flat_set<int> cached_image_ids_;
uint64_t total_stored_image_memory_ = 0;
base::RepeatingClosure set_needs_flush_callback_;
// The same value as is used in content::WebGraphicsConext3DProviderImpl.
static constexpr uint64_t kMaxPinnedMemory = 64 * 1024 * 1024;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_MEMORY_MANAGED_PAINT_CANVAS_H_
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