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// Copyright 2017 The Chromium Authors
// 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_CANVAS_RESOURCE_HOST_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_CANVAS_RESOURCE_HOST_H_
#include <memory>
#include "cc/layers/texture_layer.h"
#include "third_party/blink/renderer/platform/graphics/flush_reason.h"
#include "third_party/blink/renderer/platform/graphics/opacity_mode.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/hdr_metadata.h"
namespace cc {
class PaintCanvas;
} // namespace cc
namespace blink {
class CanvasResourceProvider;
// Specifies whether the provider should rasterize paint commands on the CPU
// or GPU. This is used to support software raster with GPU compositing.
enum class RasterMode {
kGPU,
kCPU,
};
enum class RasterModeHint {
kPreferGPU,
kPreferCPU,
};
class PLATFORM_EXPORT CanvasResourceHost {
public:
explicit CanvasResourceHost(gfx::Size size);
virtual ~CanvasResourceHost();
virtual void NotifyGpuContextLost() = 0;
// TODO(crbug.com/399587138): Delete once `cc::Layer` related code is moved to
// `CanvasRenderingContext2D`. `IsContextLost()` is only needed by
// `IsResourceValid()`, which is needed by `PrepareTransferableResource()`,
// which is needed by cc_layer_, which is only used by
// CanvasRenderingContext2D.
virtual bool IsContextLost() const = 0;
virtual void SetNeedsCompositingUpdate() = 0;
virtual void InitializeForRecording(cc::PaintCanvas* canvas) const = 0;
virtual void UpdateMemoryUsage() = 0;
virtual size_t GetMemoryUsage() const = 0;
virtual void PageVisibilityChanged() {}
virtual CanvasResourceProvider* GetOrCreateCanvasResourceProvider() = 0;
// Initialize the indicated cc::Layer with the HTMLCanvasElement's CSS
// properties. This is a no-op if `this` is not an HTMLCanvasElement.
virtual void InitializeLayerWithCSSProperties(cc::Layer* layer) {}
bool IsComposited() const;
gfx::Size Size() const { return size_; }
virtual void SetSize(gfx::Size size) { size_ = size; }
virtual bool LowLatencyEnabled() const { return false; }
CanvasResourceProvider* ResourceProvider() const {
return resource_provider_.get();
}
void FlushRecording(FlushReason reason);
std::unique_ptr<CanvasResourceProvider> ReplaceResourceProvider(
std::unique_ptr<CanvasResourceProvider>);
virtual void DiscardResourceProvider();
virtual bool IsPageVisible() const = 0;
virtual bool IsPrinting() const { return false; }
virtual bool PrintedInCurrentTask() const = 0;
virtual bool IsHibernating() const { return false; }
bool ShouldTryToUseGpuRaster() const;
void SetPreferred2DRasterMode(RasterModeHint);
void AlwaysEnableRasterTimersForTesting() {
always_enable_raster_timers_for_testing_ = true;
}
// Actual RasterMode used for rendering 2d primitives.
RasterMode GetRasterMode() const;
// Called when the CC texture layer that this instance is holding (if any)
// should be cleared. Subclasses that can hold a CC texture layer should
// override this method.
virtual void ClearLayerTexture() {}
virtual void SetTransferToGPUTextureWasInvoked() {}
virtual bool TransferToGPUTextureWasInvoked() { return false; }
protected:
virtual CanvasResourceProvider* GetOrCreateCanvasResourceProviderImpl() = 0;
private:
std::unique_ptr<CanvasResourceProvider> resource_provider_;
RasterModeHint preferred_2d_raster_mode_ = RasterModeHint::kPreferCPU;
gfx::Size size_;
bool always_enable_raster_timers_for_testing_ = false;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_CANVAS_RESOURCE_HOST_H_
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