third_party/WebKit/Source/platform/graphics/gpu/AcceleratedImageBufferSurface.cpp

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#include "config.h"
#include "platform/graphics/gpu/AcceleratedImageBufferSurface.h"

#include "public/platform/Platform.h"
#include "public/platform/WebGraphicsContext3DProvider.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkDevice.h"
#include "third_party/skia/include/gpu/GrRenderTarget.h"
#include "third_party/skia/include/gpu/GrTexture.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/RefPtr.h"

namespace blink {

AcceleratedImageBufferSurface::AcceleratedImageBufferSurface(const IntSize& size, OpacityMode opacityMode)
    : ImageBufferSurface(size, opacityMode)
{
    m_contextProvider = adoptPtr(Platform::current()->createSharedOffscreenGraphicsContext3DProvider());
    if (!m_contextProvider)
        return;
    GrContext* grContext = m_contextProvider->grContext();
    if (!grContext)
        return;

    SkAlphaType alphaType = (Opaque == opacityMode) ? kOpaque_SkAlphaType : kPremul_SkAlphaType;
    SkImageInfo info = SkImageInfo::MakeN32(size.width(), size.height(), alphaType);
    SkSurfaceProps disableLCDProps(0, kUnknown_SkPixelGeometry);
    m_surface = adoptPtr(SkSurface::NewRenderTarget(grContext, SkSurface::kYes_Budgeted, info, 0 /* sampleCount */,
        Opaque == opacityMode ? nullptr : &disableLCDProps));
    if (!m_surface.get())
        return;
    clear();
}

PassRefPtr<SkImage> AcceleratedImageBufferSurface::newImageSnapshot(AccelerationHint)
{
    return adoptRef(m_surface->newImageSnapshot());
}

Platform3DObject AcceleratedImageBufferSurface::getBackingTextureHandleForOverwrite()
{
    if (!m_surface)
        return 0;
    return m_surface->getTextureHandle(SkSurface::kDiscardWrite_TextureHandleAccess);
}

} // namespace blink