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      1 /*
      2  * Copyright (c) 2013, Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 
     33 #include "platform/graphics/gpu/WebGLImageBufferSurface.h"
     34 
     35 #include "platform/graphics/skia/GaneshUtils.h"
     36 #include "public/platform/Platform.h"
     37 #include "public/platform/WebGraphicsContext3DProvider.h"
     38 #include "third_party/skia/include/core/SkPixelRef.h"
     39 #include "wtf/PassOwnPtr.h"
     40 
     41 namespace WebCore {
     42 
     43 WebGLImageBufferSurface::WebGLImageBufferSurface(const IntSize& size, OpacityMode opacityMode)
     44     : ImageBufferSurface(size, opacityMode)
     45 {
     46     m_contextProvider = adoptPtr(blink::Platform::current()->createSharedOffscreenGraphicsContext3DProvider());
     47     if (!m_contextProvider)
     48         return;
     49     GrContext* gr = m_contextProvider->grContext();
     50     if (!gr)
     51         return;
     52     ensureTextureBackedSkBitmap(gr, m_bitmap, size, kDefault_GrSurfaceOrigin, kRGBA_8888_GrPixelConfig);
     53 }
     54 
     55 WebGLImageBufferSurface::~WebGLImageBufferSurface()
     56 {
     57 }
     58 
     59 Platform3DObject WebGLImageBufferSurface::getBackingTexture() const
     60 {
     61     GrTexture* texture = m_bitmap.getTexture();
     62     if (!texture)
     63         return 0;
     64     return texture->getTextureHandle();
     65 }
     66 
     67 void WebGLImageBufferSurface::invalidateCachedBitmap()
     68 {
     69     m_cachedBitmap.reset();
     70 }
     71 
     72 void WebGLImageBufferSurface::updateCachedBitmapIfNeeded()
     73 {
     74     if (m_cachedBitmap.isNull() && m_bitmap.pixelRef()) {
     75         (m_bitmap.pixelRef())->readPixels(&m_cachedBitmap);
     76     }
     77 }
     78 
     79 } // namespace WebCore
     80