root/Source/platform/graphics/gpu/WebGLImageBufferSurface.cpp

DEFINITIONS

1. getBackingTexture
2. invalidateCachedBitmap
3. updateCachedBitmapIfNeeded

/*
 * Copyright (c) 2013, Google 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 are
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 *
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 * in the documentation and/or other materials provided with the
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "config.h"

#include "platform/graphics/gpu/WebGLImageBufferSurface.h"

#include "platform/graphics/skia/GaneshUtils.h"
#include "public/platform/Platform.h"
#include "public/platform/WebGraphicsContext3DProvider.h"
#include "third_party/skia/include/core/SkPixelRef.h"
#include "wtf/PassOwnPtr.h"

namespace WebCore {

WebGLImageBufferSurface::WebGLImageBufferSurface(const IntSize& size, OpacityMode opacityMode)
    : ImageBufferSurface(size, opacityMode)
{
    m_contextProvider = adoptPtr(blink::Platform::current()->createSharedOffscreenGraphicsContext3DProvider());
    if (!m_contextProvider)
        return;
    GrContext* gr = m_contextProvider->grContext();
    if (!gr)
        return;
    ensureTextureBackedSkBitmap(gr, m_bitmap, size, kDefault_GrSurfaceOrigin, kRGBA_8888_GrPixelConfig);
}

WebGLImageBufferSurface::~WebGLImageBufferSurface()
{
}

Platform3DObject WebGLImageBufferSurface::getBackingTexture() const
{
    GrTexture* texture = m_bitmap.getTexture();
    if (!texture)
        return 0;
    return texture->getTextureHandle();
}

void WebGLImageBufferSurface::invalidateCachedBitmap()
{
    m_cachedBitmap.reset();
}

void WebGLImageBufferSurface::updateCachedBitmapIfNeeded()
{
    if (m_cachedBitmap.isNull() && m_bitmap.pixelRef()) {
        (m_bitmap.pixelRef())->readPixels(&m_cachedBitmap);
    }
}

} // namespace WebCore