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/*
* Copyright (C) 2017-2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if ENABLE(OFFSCREEN_CANVAS)
#include "CanvasRenderingContext.h"
#include <wtf/TZoneMalloc.h>
#include <wtf/ThreadSafeRefCounted.h>
#include <wtf/WeakPtr.h>
namespace WebCore {
class PlaceholderRenderingContext;
// Thread-safe interface to submit frames from worker to the placeholder rendering context.
class PlaceholderRenderingContextSource : public ThreadSafeRefCounted<PlaceholderRenderingContextSource> {
WTF_MAKE_TZONE_ALLOCATED(PlaceholderRenderingContextSource);
WTF_MAKE_NONCOPYABLE(PlaceholderRenderingContextSource);
public:
static Ref<PlaceholderRenderingContextSource> create(PlaceholderRenderingContext&);
virtual ~PlaceholderRenderingContextSource() = default;
// Called by the offscreen context to submit the frame.
void setPlaceholderBuffer(ImageBuffer&, bool opaque);
// Called by the placeholder context to attach to compositor layer.
void setContentsToLayer(GraphicsLayer&, ImageBuffer*, bool opaque);
private:
explicit PlaceholderRenderingContextSource(PlaceholderRenderingContext&);
WeakPtr<PlaceholderRenderingContext> m_placeholder; // For main thread use.
Lock m_lock;
RefPtr<GraphicsLayerAsyncContentsDisplayDelegate> m_delegate WTF_GUARDED_BY_LOCK(m_lock);
unsigned m_bufferVersion { 0 }; // For OffscreenCanvas holder thread use (main or worker).
unsigned m_delegateBufferVersion WTF_GUARDED_BY_LOCK(m_lock) { 0 };
unsigned m_placeholderBufferVersion WTF_GUARDED_BY_CAPABILITY(mainThread) { 0 };
};
class PlaceholderRenderingContext final : public CanvasRenderingContext {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED(PlaceholderRenderingContext);
public:
static std::unique_ptr<PlaceholderRenderingContext> create(HTMLCanvasElement&);
HTMLCanvasElement& canvas() const;
Ref<HTMLCanvasElement> protectedCanvas() const { return canvas(); }
IntSize size() const;
void setPlaceholderBuffer(Ref<ImageBuffer>&&, bool opaque);
PlaceholderRenderingContextSource& source() const { return m_source; }
private:
PlaceholderRenderingContext(HTMLCanvasElement&);
void setContentsToLayer(GraphicsLayer&) final;
ImageBufferPixelFormat pixelFormat() const final;
bool isOpaque() const final { return m_opaque; }
const Ref<PlaceholderRenderingContextSource> m_source;
bool m_opaque { false };
};
}
SPECIALIZE_TYPE_TRAITS_CANVASRENDERINGCONTEXT(WebCore::PlaceholderRenderingContext, isPlaceholder())
#endif
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