Source/WebKit/WebProcess/GPU/graphics/cocoa/ImageBufferShareableMappedIOSurfaceBackend.cpp

/*
 * Copyright (C) 2020 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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#include "config.h"
#include "ImageBufferShareableMappedIOSurfaceBackend.h"

#if ENABLE(GPU_PROCESS) && HAVE(IOSURFACE)

#include <WebCore/GraphicsContextCG.h>
#include <wtf/IsoMallocInlines.h>
#include <wtf/StdLibExtras.h>

namespace WebKit {
using namespace WebCore;

WTF_MAKE_ISO_ALLOCATED_IMPL(ImageBufferShareableMappedIOSurfaceBackend);

std::unique_ptr<ImageBufferShareableMappedIOSurfaceBackend> ImageBufferShareableMappedIOSurfaceBackend::create(const FloatSize& size, float resolutionScale, ColorSpace colorSpace, PixelFormat pixelFormat, const HostWindow*)
{
    IntSize backendSize = calculateBackendSize(size, resolutionScale);
    if (backendSize.isEmpty())
        return nullptr;

    auto surface = IOSurface::create(backendSize, backendSize, cachedCGColorSpace(colorSpace), IOSurface::formatForPixelFormat(pixelFormat));
    if (!surface)
        return nullptr;

    RetainPtr<CGContextRef> cgContext = surface->ensurePlatformContext();
    if (!cgContext)
        return nullptr;

    CGContextClearRect(cgContext.get(), FloatRect(FloatPoint::zero(), backendSize));

    return makeUnique<ImageBufferShareableMappedIOSurfaceBackend>(size, backendSize, resolutionScale, colorSpace, pixelFormat, WTFMove(surface));
}

std::unique_ptr<ImageBufferShareableMappedIOSurfaceBackend> ImageBufferShareableMappedIOSurfaceBackend::create(const FloatSize& logicalSize, const IntSize& internalSize, float resolutionScale, ColorSpace colorSpace, PixelFormat pixelFormat, ImageBufferBackendHandle handle)
{
    if (!WTF::holds_alternative<MachSendRight>(handle)) {
        ASSERT_NOT_REACHED();
        return nullptr;
    }

    auto surface = IOSurface::createFromSendRight(WTFMove(WTF::get<MachSendRight>(handle)), cachedCGColorSpace(colorSpace));
    if (!surface)
        return nullptr;

    return makeUnique<ImageBufferShareableMappedIOSurfaceBackend>(logicalSize, internalSize, resolutionScale, colorSpace, pixelFormat, WTFMove(surface));
}

ImageBufferBackendHandle ImageBufferShareableMappedIOSurfaceBackend::createImageBufferBackendHandle() const
{
    return ImageBufferBackendHandle(m_surface->createSendRight());
}

} // namespace WebKit

#endif // ENABLE(GPU_PROCESS) && HAVE(IOSURFACE)