Source/WebCore/platform/graphics/cocoa/GraphicsContextGLIOSurfaceSwapChain.cpp

/*
 * Copyright (C) 2009, 2014-2019 Apple Inc. All rights reserved.
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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#include "config.h"
#include "GraphicsContextGLIOSurfaceSwapChain.h"

#if ENABLE(WEBGL) && PLATFORM(COCOA)

namespace WebCore {

GraphicsContextGLIOSurfaceSwapChain::~GraphicsContextGLIOSurfaceSwapChain() = default;

const GraphicsContextGLIOSurfaceSwapChain::Buffer& GraphicsContextGLIOSurfaceSwapChain::displayBuffer() const
{
    return m_displayBuffer;
}

void GraphicsContextGLIOSurfaceSwapChain::markDisplayBufferInUse()
{
    m_displayBufferInUse = true;
}

GraphicsContextGLIOSurfaceSwapChain::Buffer GraphicsContextGLIOSurfaceSwapChain::recycleBuffer()
{
    if (m_spareBuffer.surface) {
        if (m_spareBuffer.surface->isInUse())
            m_spareBuffer.surface.reset();
    }
    return std::exchange(m_spareBuffer, { });
}

void* GraphicsContextGLIOSurfaceSwapChain::detachClient()
{
    ASSERT(!m_spareBuffer.surface);
    return std::exchange(m_displayBuffer.handle, nullptr);
}

void GraphicsContextGLIOSurfaceSwapChain::present(Buffer&& buffer)
{
    ASSERT(!m_spareBuffer.surface);
    ASSERT(!m_spareBuffer.handle);
    m_spareBuffer = std::exchange(m_displayBuffer, WTFMove(buffer));
    if (m_displayBufferInUse) {
        m_displayBufferInUse = false;
        m_spareBuffer.surface.reset();
    }
}

}

#endif