Source/WebCore/Modules/WebGPU/GPUCanvasContext.h

/*
 * Copyright (C) 2021 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
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include "GPUTexture.h"
#include "GPUTextureFormat.h"
#include "HTMLCanvasElement.h"
#include "OffscreenCanvas.h"
#include <variant>
#include <wtf/Ref.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>

namespace WebCore {

class GPUAdapter;
struct GPUCanvasConfiguration;

class GPUCanvasContext : public RefCounted<GPUCanvasContext> {
public:
#if ENABLE(OFFSCREEN_CANVAS)
    using CanvasType = std::variant<RefPtr<HTMLCanvasElement>, RefPtr<OffscreenCanvas>>;
#else
    using CanvasType = std::variant<RefPtr<HTMLCanvasElement>>;
#endif

    static Ref<GPUCanvasContext> create()
    {
        return adoptRef(*new GPUCanvasContext());
    }

    CanvasType canvas();

    void configure(const GPUCanvasConfiguration&);
    void unconfigure();

    GPUTextureFormat getPreferredFormat(const GPUAdapter&);
    RefPtr<GPUTexture> getCurrentTexture();

private:
    GPUCanvasContext() = default;
};

}