Moved image packing code out of GraphicsContext3D.cpp and into a new file

Source/core/platform/graphics/GraphicsContext3DImagePacking.cpp

Index: Source/core/platform/graphics/GraphicsContext3DImagePacking.cpp
diff --git a/Source/core/platform/graphics/GraphicsContext3D.cpp b/Source/core/platform/graphics/GraphicsContext3DImagePacking.cpp
similarity index 62%
copy from Source/core/platform/graphics/GraphicsContext3D.cpp
copy to Source/core/platform/graphics/GraphicsContext3DImagePacking.cpp
index 2e4d173e0c0b2cf6f80162c7a0f8f14b5be08484..f4975671a8050b0d4476c1a667a90849a95680ae 100644
--- a/Source/core/platform/graphics/GraphicsContext3D.cpp
+++ b/Source/core/platform/graphics/GraphicsContext3DImagePacking.cpp
@@ -1,6 +1,5 @@
 /*
- * Copyright (C) 2010 Apple Inc. All rights reserved.
- * Copyright (C) 2010 Google Inc. All rights reserved.
+ * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2010 Mozilla Corporation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -22,47 +21,16 @@
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
-
 #include "core/platform/graphics/GraphicsContext3D.h"
 
-#include "GrContext.h"
-#include "GrGLInterface.h"
-#include "SkTypes.h"
 #include "core/html/ImageData.h"
 #include "core/html/canvas/CheckedInt.h"
-#include "core/platform/graphics/Extensions3D.h"
-#include "core/platform/graphics/GraphicsContext.h"
-#include "core/platform/graphics/Image.h"
-#include "core/platform/graphics/ImageBuffer.h"
 #include "core/platform/graphics/ImageObserver.h"
-#include "core/platform/graphics/cpu/arm/GraphicsContext3DNEON.h"
-#include "core/platform/graphics/gpu/DrawingBuffer.h"
 #include "core/platform/image-decoders/ImageDecoder.h"
-#include "wtf/ArrayBufferView.h"
-#include "wtf/CPU.h"
-#include "wtf/OwnArrayPtr.h"
-#include "wtf/PassOwnArrayPtr.h"
-#include "wtf/text/CString.h"
-#include "wtf/text/StringHash.h"
-#include "wtf/text/WTFString.h"
-
-#include <public/Platform.h>
-#include <public/WebGraphicsContext3D.h>
-#include <public/WebGraphicsContext3DProvider.h>
-#include <public/WebGraphicsMemoryAllocation.h>
-
-namespace {
-
-// The limit of the number of textures we hold in the GrContext's bitmap->texture cache.
-const int maxGaneshTextureCacheCount = 2048;
-// The limit of the bytes allocated toward textures in the GrContext's bitmap->texture cache.
-const size_t maxGaneshTextureCacheBytes = 96 * 1024 * 1024;
-
-}
 
 namespace WebCore {
 
@@ -150,20 +118,6 @@ GraphicsContext3D::DataFormat getDataFormat(GC3Denum destinationFormat, GC3Denum
     return dstFormat;
 }
 
-void getDrawingParameters(DrawingBuffer* drawingBuffer, WebKit::WebGraphicsContext3D* graphicsContext3D,
-                          Platform3DObject* frameBufferId, int* width, int* height)
-{
-    if (drawingBuffer) {
-        *frameBufferId = drawingBuffer->framebuffer();
-        *width = drawingBuffer->size().width();
-        *height = drawingBuffer->size().height();
-    } else {
-        *frameBufferId = 0;
-        *width = graphicsContext3D->width();
-        *height = graphicsContext3D->height();
-    }
-}
-
 // Following Float to Half-Float converion code is from the implementation of ftp://www.fox-toolkit.org/pub/fasthalffloatconversion.pdf,
 // "Fast Half Float Conversions" by Jeroen van der Zijp, November 2008 (Revised September 2010).
 // Specially, the basetable[512] and shifttable[512] are generated as follows:
@@ -287,833 +241,6 @@ unsigned short convertFloatToHalfFloat(float f)
     return baseTable[signexp] + ((temp & 0x007fffff) >> shiftTable[signexp]);
 }
 
-} // anonymous namespace
-
-GraphicsContext3D::GraphicsContext3D(PassOwnPtr<WebKit::WebGraphicsContext3D> webContext, bool preserveDrawingBuffer)
-    : m_impl(webContext.get())
-    , m_ownedWebContext(webContext)
-    , m_initializedAvailableExtensions(false)
-    , m_layerComposited(false)
-    , m_preserveDrawingBuffer(preserveDrawingBuffer)
-    , m_resourceSafety(ResourceSafetyUnknown)
-    , m_grContext(0)
-{
-}
-
-GraphicsContext3D::GraphicsContext3D(PassOwnPtr<WebKit::WebGraphicsContext3DProvider> provider, bool preserveDrawingBuffer)
-    : m_provider(provider)
-    , m_impl(m_provider->context3d())
-    , m_initializedAvailableExtensions(false)
-    , m_layerComposited(false)
-    , m_preserveDrawingBuffer(preserveDrawingBuffer)
-    , m_resourceSafety(ResourceSafetyUnknown)
-    , m_grContext(m_provider->grContext())
-{
-}
-
-GraphicsContext3D::~GraphicsContext3D()
-{
-    setContextLostCallback(nullptr);
-    setErrorMessageCallback(nullptr);
-
-    if (m_ownedGrContext) {
-        m_ownedWebContext->setMemoryAllocationChangedCallbackCHROMIUM(0);
-        m_ownedGrContext->contextDestroyed();
-    }
-}
-
-// Macros to assist in delegating from GraphicsContext3D to
-// WebGraphicsContext3D.
-
-#define DELEGATE_TO_WEBCONTEXT(name) \
-void GraphicsContext3D::name() \
-{ \
-    m_impl->name(); \
-}
-
-#define DELEGATE_TO_WEBCONTEXT_R(name, rt) \
-rt GraphicsContext3D::name() \
-{ \
-    return m_impl->name(); \
-}
-
-#define DELEGATE_TO_WEBCONTEXT_1(name, t1) \
-void GraphicsContext3D::name(t1 a1) \
-{ \
-    m_impl->name(a1); \
-}
-
-#define DELEGATE_TO_WEBCONTEXT_1R(name, t1, rt) \
-rt GraphicsContext3D::name(t1 a1) \
-{ \
-    return m_impl->name(a1); \
-}
-
-#define DELEGATE_TO_WEBCONTEXT_2(name, t1, t2) \
-void GraphicsContext3D::name(t1 a1, t2 a2) \
-{ \
-    m_impl->name(a1, a2); \
-}
-
-#define DELEGATE_TO_WEBCONTEXT_2R(name, t1, t2, rt) \
-rt GraphicsContext3D::name(t1 a1, t2 a2) \
-{ \
-    return m_impl->name(a1, a2); \
-}
-
-#define DELEGATE_TO_WEBCONTEXT_3(name, t1, t2, t3) \
-void GraphicsContext3D::name(t1 a1, t2 a2, t3 a3) \
-{ \
-    m_impl->name(a1, a2, a3); \
-}
-
-#define DELEGATE_TO_WEBCONTEXT_3R(name, t1, t2, t3, rt) \
-rt GraphicsContext3D::name(t1 a1, t2 a2, t3 a3) \
-{ \
-    return m_impl->name(a1, a2, a3); \
-}
-
-#define DELEGATE_TO_WEBCONTEXT_4(name, t1, t2, t3, t4) \
-void GraphicsContext3D::name(t1 a1, t2 a2, t3 a3, t4 a4) \
-{ \
-    m_impl->name(a1, a2, a3, a4); \
-}
-
-#define DELEGATE_TO_WEBCONTEXT_4R(name, t1, t2, t3, t4, rt) \
-rt GraphicsContext3D::name(t1 a1, t2 a2, t3 a3, t4 a4) \
-{ \
-    return m_impl->name(a1, a2, a3, a4); \
-}
-
-#define DELEGATE_TO_WEBCONTEXT_5(name, t1, t2, t3, t4, t5) \
-void GraphicsContext3D::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5) \
-{ \
-    m_impl->name(a1, a2, a3, a4, a5); \
-}
-
-#define DELEGATE_TO_WEBCONTEXT_6(name, t1, t2, t3, t4, t5, t6) \
-void GraphicsContext3D::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5, t6 a6) \
-{ \
-    m_impl->name(a1, a2, a3, a4, a5, a6); \
-}
-
-#define DELEGATE_TO_WEBCONTEXT_6R(name, t1, t2, t3, t4, t5, t6, rt) \
-rt GraphicsContext3D::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5, t6 a6) \
-{ \
-    return m_impl->name(a1, a2, a3, a4, a5, a6); \
-}
-
-#define DELEGATE_TO_WEBCONTEXT_7(name, t1, t2, t3, t4, t5, t6, t7) \
-void GraphicsContext3D::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5, t6 a6, t7 a7) \
-{ \
-    m_impl->name(a1, a2, a3, a4, a5, a6, a7); \
-}
-
-#define DELEGATE_TO_WEBCONTEXT_7R(name, t1, t2, t3, t4, t5, t6, t7, rt) \
-rt GraphicsContext3D::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5, t6 a6, t7 a7) \
-{ \
-    return m_impl->name(a1, a2, a3, a4, a5, a6, a7); \
-}
-
-#define DELEGATE_TO_WEBCONTEXT_8(name, t1, t2, t3, t4, t5, t6, t7, t8) \
-void GraphicsContext3D::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5, t6 a6, t7 a7, t8 a8) \
-{ \
-    m_impl->name(a1, a2, a3, a4, a5, a6, a7, a8); \
-}
-
-#define DELEGATE_TO_WEBCONTEXT_9(name, t1, t2, t3, t4, t5, t6, t7, t8, t9) \
-void GraphicsContext3D::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5, t6 a6, t7 a7, t8 a8, t9 a9) \
-{ \
-    m_impl->name(a1, a2, a3, a4, a5, a6, a7, a8, a9); \
-}
-
-#define DELEGATE_TO_WEBCONTEXT_9R(name, t1, t2, t3, t4, t5, t6, t7, t8, t9, rt) \
-rt GraphicsContext3D::name(t1 a1, t2 a2, t3 a3, t4 a4, t5 a5, t6 a6, t7 a7, t8 a8, t9 a9) \
-{ \
-    return m_impl->name(a1, a2, a3, a4, a5, a6, a7, a8, a9); \
-}
-
-class GraphicsContext3DContextLostCallbackAdapter : public WebKit::WebGraphicsContext3D::WebGraphicsContextLostCallback {
-public:
-    GraphicsContext3DContextLostCallbackAdapter(PassOwnPtr<GraphicsContext3D::ContextLostCallback> callback)
-        : m_contextLostCallback(callback) { }
-    virtual ~GraphicsContext3DContextLostCallbackAdapter() { }
-
-    virtual void onContextLost()
-    {
-        if (m_contextLostCallback)
-            m_contextLostCallback->onContextLost();
-    }
-private:
-    OwnPtr<GraphicsContext3D::ContextLostCallback> m_contextLostCallback;
-};
-
-class GraphicsContext3DErrorMessageCallbackAdapter : public WebKit::WebGraphicsContext3D::WebGraphicsErrorMessageCallback {
-public:
-    GraphicsContext3DErrorMessageCallbackAdapter(PassOwnPtr<GraphicsContext3D::ErrorMessageCallback> callback)
-        : m_errorMessageCallback(callback) { }
-    virtual ~GraphicsContext3DErrorMessageCallbackAdapter() { }
-
-    virtual void onErrorMessage(const WebKit::WebString& message, WebKit::WGC3Dint id)
-    {
-        if (m_errorMessageCallback)
-            m_errorMessageCallback->onErrorMessage(message, id);
-    }
-private:
-    OwnPtr<GraphicsContext3D::ErrorMessageCallback> m_errorMessageCallback;
-};
-
-void GraphicsContext3D::setContextLostCallback(PassOwnPtr<GraphicsContext3D::ContextLostCallback> callback)
-{
-    if (m_ownedWebContext) {
-        m_contextLostCallbackAdapter = adoptPtr(new GraphicsContext3DContextLostCallbackAdapter(callback));
-        m_ownedWebContext->setContextLostCallback(m_contextLostCallbackAdapter.get());
-    }
-}
-
-void GraphicsContext3D::setErrorMessageCallback(PassOwnPtr<GraphicsContext3D::ErrorMessageCallback> callback)
-{
-    if (m_ownedWebContext) {
-        m_errorMessageCallbackAdapter = adoptPtr(new GraphicsContext3DErrorMessageCallbackAdapter(callback));
-        m_ownedWebContext->setErrorMessageCallback(m_errorMessageCallbackAdapter.get());
-    }
-}
-
-PassRefPtr<GraphicsContext3D> GraphicsContext3D::create(GraphicsContext3D::Attributes attrs)
-{
-    WebKit::WebGraphicsContext3D::Attributes webAttributes;
-    webAttributes.alpha = attrs.alpha;
-    webAttributes.depth = attrs.depth;
-    webAttributes.stencil = attrs.stencil;
-    webAttributes.antialias = attrs.antialias;
-    webAttributes.premultipliedAlpha = attrs.premultipliedAlpha;
-    webAttributes.noExtensions = attrs.noExtensions;
-    webAttributes.shareResources = attrs.shareResources;
-    webAttributes.preferDiscreteGPU = attrs.preferDiscreteGPU;
-    webAttributes.topDocumentURL = attrs.topDocumentURL.string();
-
-    OwnPtr<WebKit::WebGraphicsContext3D> webContext = adoptPtr(WebKit::Platform::current()->createOffscreenGraphicsContext3D(webAttributes));
-    if (!webContext)
-        return 0;
-
-    return GraphicsContext3D::createGraphicsContextFromWebContext(webContext.release(), attrs.preserveDrawingBuffer);
-}
-
-PassRefPtr<GraphicsContext3D> GraphicsContext3D::createGraphicsContextFromProvider(PassOwnPtr<WebKit::WebGraphicsContext3DProvider> provider, bool preserveDrawingBuffer)
-{
-    RefPtr<GraphicsContext3D> context = adoptRef(new GraphicsContext3D(provider, preserveDrawingBuffer));
-    return context.release();
-}
-
-PassRefPtr<GraphicsContext3D> GraphicsContext3D::createGraphicsContextFromWebContext(PassOwnPtr<WebKit::WebGraphicsContext3D> webContext, bool preserveDrawingBuffer)
-{
-    RefPtr<GraphicsContext3D> context = adoptRef(new GraphicsContext3D(webContext, preserveDrawingBuffer));
-    return context.release();
-}
-
-class GrMemoryAllocationChangedCallbackAdapter : public WebKit::WebGraphicsContext3D::WebGraphicsMemoryAllocationChangedCallbackCHROMIUM {
-public:
-    GrMemoryAllocationChangedCallbackAdapter(GrContext* context)
-        : m_context(context)
-    {
-    }
-
-    virtual void onMemoryAllocationChanged(WebKit::WebGraphicsMemoryAllocation allocation) OVERRIDE
-    {
-        if (!m_context)
-            return;
-
-        if (!allocation.gpuResourceSizeInBytes) {
-            m_context->freeGpuResources();
-            m_context->setTextureCacheLimits(0, 0);
-        } else
-            m_context->setTextureCacheLimits(maxGaneshTextureCacheCount, maxGaneshTextureCacheBytes);
-    }
-
-private:
-    GrContext* m_context;
-};
-
-namespace {
-void bindWebGraphicsContext3DGLContextCallback(const GrGLInterface* interface)
-{
-    reinterpret_cast<WebKit::WebGraphicsContext3D*>(interface->fCallbackData)->makeContextCurrent();
-}
-}
-
-GrContext* GraphicsContext3D::grContext()
-{
-    if (m_grContext)
-        return m_grContext;
-    if (!m_ownedWebContext)
-        return 0;
-
-    SkAutoTUnref<GrGLInterface> interface(m_ownedWebContext->createGrGLInterface());
-    if (!interface)
-        return 0;
-
-    interface->fCallback = bindWebGraphicsContext3DGLContextCallback;
-    interface->fCallbackData = reinterpret_cast<GrGLInterfaceCallbackData>(m_ownedWebContext.get());
-
-    m_ownedGrContext.reset(GrContext::Create(kOpenGL_GrBackend, reinterpret_cast<GrBackendContext>(interface.get())));
-    m_grContext = m_ownedGrContext;
-    if (!m_grContext)
-        return 0;
-
-    m_grContext->setTextureCacheLimits(maxGaneshTextureCacheCount, maxGaneshTextureCacheBytes);
-    m_grContextMemoryAllocationCallbackAdapter = adoptPtr(new GrMemoryAllocationChangedCallbackAdapter(m_grContext));
-    m_ownedWebContext->setMemoryAllocationChangedCallbackCHROMIUM(m_grContextMemoryAllocationCallbackAdapter.get());
-
-    return m_grContext;
-}
-
-DELEGATE_TO_WEBCONTEXT_R(makeContextCurrent, bool)
-
-bool GraphicsContext3D::isResourceSafe()
-{
-    if (m_resourceSafety == ResourceSafetyUnknown)
-        m_resourceSafety = getExtensions()->isEnabled("GL_CHROMIUM_resource_safe") ? ResourceSafe : ResourceUnsafe;
-    return m_resourceSafety == ResourceSafe;
-}
-
-DELEGATE_TO_WEBCONTEXT_1(activeTexture, GC3Denum)
-DELEGATE_TO_WEBCONTEXT_2(attachShader, Platform3DObject, Platform3DObject)
-
-void GraphicsContext3D::bindAttribLocation(Platform3DObject program, GC3Duint index, const String& name)
-{
-    m_impl->bindAttribLocation(program, index, name.utf8().data());
-}
-
-DELEGATE_TO_WEBCONTEXT_2(bindBuffer, GC3Denum, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_2(bindFramebuffer, GC3Denum, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_2(bindRenderbuffer, GC3Denum, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_2(bindTexture, GC3Denum, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_4(blendColor, GC3Dclampf, GC3Dclampf, GC3Dclampf, GC3Dclampf)
-DELEGATE_TO_WEBCONTEXT_1(blendEquation, GC3Denum)
-DELEGATE_TO_WEBCONTEXT_2(blendEquationSeparate, GC3Denum, GC3Denum)
-DELEGATE_TO_WEBCONTEXT_2(blendFunc, GC3Denum, GC3Denum)
-DELEGATE_TO_WEBCONTEXT_4(blendFuncSeparate, GC3Denum, GC3Denum, GC3Denum, GC3Denum)
-
-void GraphicsContext3D::bufferData(GC3Denum target, GC3Dsizeiptr size, GC3Denum usage)
-{
-    bufferData(target, size, 0, usage);
-}
-
-DELEGATE_TO_WEBCONTEXT_4(bufferData, GC3Denum, GC3Dsizeiptr, const void*, GC3Denum)
-DELEGATE_TO_WEBCONTEXT_4(bufferSubData, GC3Denum, GC3Dintptr, GC3Dsizeiptr, const void*)
-
-DELEGATE_TO_WEBCONTEXT_1R(checkFramebufferStatus, GC3Denum, GC3Denum)
-DELEGATE_TO_WEBCONTEXT_1(clear, GC3Dbitfield)
-DELEGATE_TO_WEBCONTEXT_4(clearColor, GC3Dclampf, GC3Dclampf, GC3Dclampf, GC3Dclampf)
-DELEGATE_TO_WEBCONTEXT_1(clearDepth, GC3Dclampf)
-DELEGATE_TO_WEBCONTEXT_1(clearStencil, GC3Dint)
-DELEGATE_TO_WEBCONTEXT_4(colorMask, GC3Dboolean, GC3Dboolean, GC3Dboolean, GC3Dboolean)
-DELEGATE_TO_WEBCONTEXT_1(compileShader, Platform3DObject)
-
-DELEGATE_TO_WEBCONTEXT_8(compressedTexImage2D, GC3Denum, GC3Dint, GC3Denum, GC3Dint, GC3Dint, GC3Dsizei, GC3Dsizei, const void*)
-DELEGATE_TO_WEBCONTEXT_9(compressedTexSubImage2D, GC3Denum, GC3Dint, GC3Dint, GC3Dint, GC3Dint, GC3Dint, GC3Denum, GC3Dsizei, const void*)
-DELEGATE_TO_WEBCONTEXT_8(copyTexImage2D, GC3Denum, GC3Dint, GC3Denum, GC3Dint, GC3Dint, GC3Dsizei, GC3Dsizei, GC3Dint)
-DELEGATE_TO_WEBCONTEXT_8(copyTexSubImage2D, GC3Denum, GC3Dint, GC3Dint, GC3Dint, GC3Dint, GC3Dint, GC3Dsizei, GC3Dsizei)
-DELEGATE_TO_WEBCONTEXT_1(cullFace, GC3Denum)
-DELEGATE_TO_WEBCONTEXT_1(depthFunc, GC3Denum)
-DELEGATE_TO_WEBCONTEXT_1(depthMask, GC3Dboolean)
-DELEGATE_TO_WEBCONTEXT_2(depthRange, GC3Dclampf, GC3Dclampf)
-DELEGATE_TO_WEBCONTEXT_2(detachShader, Platform3DObject, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_1(disable, GC3Denum)
-DELEGATE_TO_WEBCONTEXT_1(disableVertexAttribArray, GC3Duint)
-DELEGATE_TO_WEBCONTEXT_3(drawArrays, GC3Denum, GC3Dint, GC3Dsizei)
-DELEGATE_TO_WEBCONTEXT_4(drawElements, GC3Denum, GC3Dsizei, GC3Denum, GC3Dintptr)
-
-DELEGATE_TO_WEBCONTEXT_1(enable, GC3Denum)
-DELEGATE_TO_WEBCONTEXT_1(enableVertexAttribArray, GC3Duint)
-DELEGATE_TO_WEBCONTEXT(finish)
-DELEGATE_TO_WEBCONTEXT(flush)
-DELEGATE_TO_WEBCONTEXT_4(framebufferRenderbuffer, GC3Denum, GC3Denum, GC3Denum, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_5(framebufferTexture2D, GC3Denum, GC3Denum, GC3Denum, Platform3DObject, GC3Dint)
-DELEGATE_TO_WEBCONTEXT_1(frontFace, GC3Denum)
-DELEGATE_TO_WEBCONTEXT_1(generateMipmap, GC3Denum)
-
-bool GraphicsContext3D::getActiveAttrib(Platform3DObject program, GC3Duint index, ActiveInfo& info)
-{
-    WebKit::WebGraphicsContext3D::ActiveInfo webInfo;
-    if (!m_impl->getActiveAttrib(program, index, webInfo))
-        return false;
-    info.name = webInfo.name;
-    info.type = webInfo.type;
-    info.size = webInfo.size;
-    return true;
-}
-
-bool GraphicsContext3D::getActiveUniform(Platform3DObject program, GC3Duint index, ActiveInfo& info)
-{
-    WebKit::WebGraphicsContext3D::ActiveInfo webInfo;
-    if (!m_impl->getActiveUniform(program, index, webInfo))
-        return false;
-    info.name = webInfo.name;
-    info.type = webInfo.type;
-    info.size = webInfo.size;
-    return true;
-}
-
-DELEGATE_TO_WEBCONTEXT_4(getAttachedShaders, Platform3DObject, GC3Dsizei, GC3Dsizei*, Platform3DObject*)
-
-GC3Dint GraphicsContext3D::getAttribLocation(Platform3DObject program, const String& name)
-{
-    return m_impl->getAttribLocation(program, name.utf8().data());
-}
-
-DELEGATE_TO_WEBCONTEXT_2(getBooleanv, GC3Denum, GC3Dboolean*)
-DELEGATE_TO_WEBCONTEXT_3(getBufferParameteriv, GC3Denum, GC3Denum, GC3Dint*)
-
-GraphicsContext3D::Attributes GraphicsContext3D::getContextAttributes()
-{
-    WebKit::WebGraphicsContext3D::Attributes webAttributes = m_impl->getContextAttributes();
-    GraphicsContext3D::Attributes attributes;
-    attributes.alpha = webAttributes.alpha;
-    attributes.depth = webAttributes.depth;
-    attributes.stencil = webAttributes.stencil;
-    attributes.antialias = webAttributes.antialias;
-    attributes.premultipliedAlpha = webAttributes.premultipliedAlpha;
-    attributes.preserveDrawingBuffer = m_preserveDrawingBuffer;
-    attributes.preferDiscreteGPU = webAttributes.preferDiscreteGPU;
-    return attributes;
-}
-
-DELEGATE_TO_WEBCONTEXT_R(getError, GC3Denum)
-DELEGATE_TO_WEBCONTEXT_2(getFloatv, GC3Denum, GC3Dfloat*)
-DELEGATE_TO_WEBCONTEXT_4(getFramebufferAttachmentParameteriv, GC3Denum, GC3Denum, GC3Denum, GC3Dint*)
-DELEGATE_TO_WEBCONTEXT_2(getIntegerv, GC3Denum, GC3Dint*)
-DELEGATE_TO_WEBCONTEXT_3(getProgramiv, Platform3DObject, GC3Denum, GC3Dint*)
-DELEGATE_TO_WEBCONTEXT_1R(getProgramInfoLog, Platform3DObject, String)
-DELEGATE_TO_WEBCONTEXT_3(getRenderbufferParameteriv, GC3Denum, GC3Denum, GC3Dint*)
-DELEGATE_TO_WEBCONTEXT_3(getShaderiv, Platform3DObject, GC3Denum, GC3Dint*)
-DELEGATE_TO_WEBCONTEXT_1R(getShaderInfoLog, Platform3DObject, String)
-DELEGATE_TO_WEBCONTEXT_4(getShaderPrecisionFormat, GC3Denum, GC3Denum, GC3Dint*, GC3Dint*)
-DELEGATE_TO_WEBCONTEXT_1R(getShaderSource, Platform3DObject, String)
-DELEGATE_TO_WEBCONTEXT_1R(getString, GC3Denum, String)
-DELEGATE_TO_WEBCONTEXT_3(getTexParameterfv, GC3Denum, GC3Denum, GC3Dfloat*)
-DELEGATE_TO_WEBCONTEXT_3(getTexParameteriv, GC3Denum, GC3Denum, GC3Dint*)
-DELEGATE_TO_WEBCONTEXT_3(getUniformfv, Platform3DObject, GC3Dint, GC3Dfloat*)
-DELEGATE_TO_WEBCONTEXT_3(getUniformiv, Platform3DObject, GC3Dint, GC3Dint*)
-
-GC3Dint GraphicsContext3D::getUniformLocation(Platform3DObject program, const String& name)
-{
-    return m_impl->getUniformLocation(program, name.utf8().data());
-}
-
-DELEGATE_TO_WEBCONTEXT_3(getVertexAttribfv, GC3Duint, GC3Denum, GC3Dfloat*)
-DELEGATE_TO_WEBCONTEXT_3(getVertexAttribiv, GC3Duint, GC3Denum, GC3Dint*)
-DELEGATE_TO_WEBCONTEXT_2R(getVertexAttribOffset, GC3Duint, GC3Denum, GC3Dsizeiptr)
-
-DELEGATE_TO_WEBCONTEXT_2(hint, GC3Denum, GC3Denum)
-DELEGATE_TO_WEBCONTEXT_1R(isBuffer, Platform3DObject, GC3Dboolean)
-DELEGATE_TO_WEBCONTEXT_1R(isEnabled, GC3Denum, GC3Dboolean)
-DELEGATE_TO_WEBCONTEXT_1R(isFramebuffer, Platform3DObject, GC3Dboolean)
-DELEGATE_TO_WEBCONTEXT_1R(isProgram, Platform3DObject, GC3Dboolean)
-DELEGATE_TO_WEBCONTEXT_1R(isRenderbuffer, Platform3DObject, GC3Dboolean)
-DELEGATE_TO_WEBCONTEXT_1R(isShader, Platform3DObject, GC3Dboolean)
-DELEGATE_TO_WEBCONTEXT_1R(isTexture, Platform3DObject, GC3Dboolean)
-DELEGATE_TO_WEBCONTEXT_1(lineWidth, GC3Dfloat)
-DELEGATE_TO_WEBCONTEXT_1(linkProgram, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_2(pixelStorei, GC3Denum, GC3Dint)
-DELEGATE_TO_WEBCONTEXT_2(polygonOffset, GC3Dfloat, GC3Dfloat)
-
-DELEGATE_TO_WEBCONTEXT_7(readPixels, GC3Dint, GC3Dint, GC3Dsizei, GC3Dsizei, GC3Denum, GC3Denum, void*)
-
-DELEGATE_TO_WEBCONTEXT(releaseShaderCompiler)
-DELEGATE_TO_WEBCONTEXT_4(renderbufferStorage, GC3Denum, GC3Denum, GC3Dsizei, GC3Dsizei)
-DELEGATE_TO_WEBCONTEXT_2(sampleCoverage, GC3Dclampf, GC3Dboolean)
-DELEGATE_TO_WEBCONTEXT_4(scissor, GC3Dint, GC3Dint, GC3Dsizei, GC3Dsizei)
-
-void GraphicsContext3D::shaderSource(Platform3DObject shader, const String& string)
-{
-    m_impl->shaderSource(shader, string.utf8().data());
-}
-
-DELEGATE_TO_WEBCONTEXT_3(stencilFunc, GC3Denum, GC3Dint, GC3Duint)
-DELEGATE_TO_WEBCONTEXT_4(stencilFuncSeparate, GC3Denum, GC3Denum, GC3Dint, GC3Duint)
-DELEGATE_TO_WEBCONTEXT_1(stencilMask, GC3Duint)
-DELEGATE_TO_WEBCONTEXT_2(stencilMaskSeparate, GC3Denum, GC3Duint)
-DELEGATE_TO_WEBCONTEXT_3(stencilOp, GC3Denum, GC3Denum, GC3Denum)
-DELEGATE_TO_WEBCONTEXT_4(stencilOpSeparate, GC3Denum, GC3Denum, GC3Denum, GC3Denum)
-
-DELEGATE_TO_WEBCONTEXT_9(texImage2D, GC3Denum, GC3Dint, GC3Denum, GC3Dsizei, GC3Dsizei, GC3Dint, GC3Denum, GC3Denum, const void*)
-DELEGATE_TO_WEBCONTEXT_3(texParameterf, GC3Denum, GC3Denum, GC3Dfloat)
-DELEGATE_TO_WEBCONTEXT_3(texParameteri, GC3Denum, GC3Denum, GC3Dint)
-DELEGATE_TO_WEBCONTEXT_9(texSubImage2D, GC3Denum, GC3Dint, GC3Dint, GC3Dint, GC3Dsizei, GC3Dsizei, GC3Denum, GC3Denum, const void*)
-
-DELEGATE_TO_WEBCONTEXT_2(uniform1f, GC3Dint, GC3Dfloat)
-DELEGATE_TO_WEBCONTEXT_3(uniform1fv, GC3Dint, GC3Dsizei, GC3Dfloat*)
-DELEGATE_TO_WEBCONTEXT_2(uniform1i, GC3Dint, GC3Dint)
-DELEGATE_TO_WEBCONTEXT_3(uniform1iv, GC3Dint, GC3Dsizei, GC3Dint*)
-DELEGATE_TO_WEBCONTEXT_3(uniform2f, GC3Dint, GC3Dfloat, GC3Dfloat)
-DELEGATE_TO_WEBCONTEXT_3(uniform2fv, GC3Dint, GC3Dsizei, GC3Dfloat*)
-DELEGATE_TO_WEBCONTEXT_3(uniform2i, GC3Dint, GC3Dint, GC3Dint)
-DELEGATE_TO_WEBCONTEXT_3(uniform2iv, GC3Dint, GC3Dsizei, GC3Dint*)
-DELEGATE_TO_WEBCONTEXT_4(uniform3f, GC3Dint, GC3Dfloat, GC3Dfloat, GC3Dfloat)
-DELEGATE_TO_WEBCONTEXT_3(uniform3fv, GC3Dint, GC3Dsizei, GC3Dfloat*)
-DELEGATE_TO_WEBCONTEXT_4(uniform3i, GC3Dint, GC3Dint, GC3Dint, GC3Dint)
-DELEGATE_TO_WEBCONTEXT_3(uniform3iv, GC3Dint, GC3Dsizei, GC3Dint*)
-DELEGATE_TO_WEBCONTEXT_5(uniform4f, GC3Dint, GC3Dfloat, GC3Dfloat, GC3Dfloat, GC3Dfloat)
-DELEGATE_TO_WEBCONTEXT_3(uniform4fv, GC3Dint, GC3Dsizei, GC3Dfloat*)
-DELEGATE_TO_WEBCONTEXT_5(uniform4i, GC3Dint, GC3Dint, GC3Dint, GC3Dint, GC3Dint)
-DELEGATE_TO_WEBCONTEXT_3(uniform4iv, GC3Dint, GC3Dsizei, GC3Dint*)
-DELEGATE_TO_WEBCONTEXT_4(uniformMatrix2fv, GC3Dint, GC3Dsizei, GC3Dboolean, GC3Dfloat*)
-DELEGATE_TO_WEBCONTEXT_4(uniformMatrix3fv, GC3Dint, GC3Dsizei, GC3Dboolean, GC3Dfloat*)
-DELEGATE_TO_WEBCONTEXT_4(uniformMatrix4fv, GC3Dint, GC3Dsizei, GC3Dboolean, GC3Dfloat*)
-
-DELEGATE_TO_WEBCONTEXT_1(useProgram, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_1(validateProgram, Platform3DObject)
-
-DELEGATE_TO_WEBCONTEXT_2(vertexAttrib1f, GC3Duint, GC3Dfloat)
-DELEGATE_TO_WEBCONTEXT_2(vertexAttrib1fv, GC3Duint, GC3Dfloat*)
-DELEGATE_TO_WEBCONTEXT_3(vertexAttrib2f, GC3Duint, GC3Dfloat, GC3Dfloat)
-DELEGATE_TO_WEBCONTEXT_2(vertexAttrib2fv, GC3Duint, GC3Dfloat*)
-DELEGATE_TO_WEBCONTEXT_4(vertexAttrib3f, GC3Duint, GC3Dfloat, GC3Dfloat, GC3Dfloat)
-DELEGATE_TO_WEBCONTEXT_2(vertexAttrib3fv, GC3Duint, GC3Dfloat*)
-DELEGATE_TO_WEBCONTEXT_5(vertexAttrib4f, GC3Duint, GC3Dfloat, GC3Dfloat, GC3Dfloat, GC3Dfloat)
-DELEGATE_TO_WEBCONTEXT_2(vertexAttrib4fv, GC3Duint, GC3Dfloat*)
-DELEGATE_TO_WEBCONTEXT_6(vertexAttribPointer, GC3Duint, GC3Dint, GC3Denum, GC3Dboolean, GC3Dsizei, GC3Dintptr)
-
-DELEGATE_TO_WEBCONTEXT_4(viewport, GC3Dint, GC3Dint, GC3Dsizei, GC3Dsizei)
-
-void GraphicsContext3D::reshape(int width, int height)
-{
-    if (width == m_impl->width() && height == m_impl->height())
-        return;
-
-    m_impl->reshape(width, height);
-}
-
-void GraphicsContext3D::markContextChanged()
-{
-    m_layerComposited = false;
-}
-
-bool GraphicsContext3D::layerComposited() const
-{
-    return m_layerComposited;
-}
-
-void GraphicsContext3D::markLayerComposited()
-{
-    m_layerComposited = true;
-}
-
-void GraphicsContext3D::paintRenderingResultsToCanvas(ImageBuffer* imageBuffer, DrawingBuffer* drawingBuffer)
-{
-    Platform3DObject framebufferId;
-    int width, height;
-    getDrawingParameters(drawingBuffer, m_impl, &framebufferId, &width, &height);
-    paintFramebufferToCanvas(framebufferId, width, height, !getContextAttributes().premultipliedAlpha, imageBuffer);
-}
-
-PassRefPtr<ImageData> GraphicsContext3D::paintRenderingResultsToImageData(DrawingBuffer* drawingBuffer)
-{
-    if (getContextAttributes().premultipliedAlpha)
-        return 0;
-
-    Platform3DObject framebufferId;
-    int width, height;
-    getDrawingParameters(drawingBuffer, m_impl, &framebufferId, &width, &height);
-
-    RefPtr<ImageData> imageData = ImageData::create(IntSize(width, height));
-    unsigned char* pixels = imageData->data()->data();
-    size_t bufferSize = 4 * width * height;
-
-    m_impl->readBackFramebuffer(pixels, bufferSize, framebufferId, width, height);
-
-#if (SK_R32_SHIFT == 16) && !SK_B32_SHIFT
-    // If the implementation swapped the red and blue channels, un-swap them.
-    for (size_t i = 0; i < bufferSize; i += 4)
-        std::swap(pixels[i], pixels[i + 2]);
-#endif
-
-    return imageData.release();
-}
-
-DELEGATE_TO_WEBCONTEXT_R(createBuffer, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_R(createFramebuffer, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_R(createProgram, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_R(createRenderbuffer, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_1R(createShader, GC3Denum, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_R(createTexture, Platform3DObject)
-
-DELEGATE_TO_WEBCONTEXT_1(deleteBuffer, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_1(deleteFramebuffer, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_1(deleteProgram, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_1(deleteRenderbuffer, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_1(deleteShader, Platform3DObject)
-DELEGATE_TO_WEBCONTEXT_1(deleteTexture, Platform3DObject)
-
-DELEGATE_TO_WEBCONTEXT_1(synthesizeGLError, GC3Denum)
-
-Extensions3D* GraphicsContext3D::getExtensions()
-{
-    if (!m_extensions)
-        m_extensions = adoptPtr(new Extensions3D(this));
-    return m_extensions.get();
-}
-
-bool GraphicsContext3D::texImage2DResourceSafe(GC3Denum target, GC3Dint level, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height, GC3Dint border, GC3Denum format, GC3Denum type, GC3Dint unpackAlignment)
-{
-    ASSERT(unpackAlignment == 1 || unpackAlignment == 2 || unpackAlignment == 4 || unpackAlignment == 8);
-    OwnArrayPtr<unsigned char> zero;
-    if (!isResourceSafe() && width > 0 && height > 0) {
-        unsigned int size;
-        GC3Denum error = computeImageSizeInBytes(format, type, width, height, unpackAlignment, &size, 0);
-        if (error != GraphicsContext3D::NO_ERROR) {
-            synthesizeGLError(error);
-            return false;
-        }
-        zero = adoptArrayPtr(new unsigned char[size]);
-        if (!zero) {
-            synthesizeGLError(GraphicsContext3D::INVALID_VALUE);
-            return false;
-        }
-        memset(zero.get(), 0, size);
-    }
-    texImage2D(target, level, internalformat, width, height, border, format, type, zero.get());
-    return true;
-}
-
-bool GraphicsContext3D::computeFormatAndTypeParameters(GC3Denum format,
-                                                       GC3Denum type,
-                                                       unsigned int* componentsPerPixel,
-                                                       unsigned int* bytesPerComponent)
-{
-    switch (format) {
-    case GraphicsContext3D::ALPHA:
-    case GraphicsContext3D::LUMINANCE:
-    case GraphicsContext3D::DEPTH_COMPONENT:
-    case GraphicsContext3D::DEPTH_STENCIL:
-        *componentsPerPixel = 1;
-        break;
-    case GraphicsContext3D::LUMINANCE_ALPHA:
-        *componentsPerPixel = 2;
-        break;
-    case GraphicsContext3D::RGB:
-        *componentsPerPixel = 3;
-        break;
-    case GraphicsContext3D::RGBA:
-    case Extensions3D::BGRA_EXT: // GL_EXT_texture_format_BGRA8888
-        *componentsPerPixel = 4;
-        break;
-    default:
-        return false;
-    }
-    switch (type) {
-    case GraphicsContext3D::UNSIGNED_BYTE:
-        *bytesPerComponent = sizeof(GC3Dubyte);
-        break;
-    case GraphicsContext3D::UNSIGNED_SHORT:
-        *bytesPerComponent = sizeof(GC3Dushort);
-        break;
-    case GraphicsContext3D::UNSIGNED_SHORT_5_6_5:
-    case GraphicsContext3D::UNSIGNED_SHORT_4_4_4_4:
-    case GraphicsContext3D::UNSIGNED_SHORT_5_5_5_1:
-        *componentsPerPixel = 1;
-        *bytesPerComponent = sizeof(GC3Dushort);
-        break;
-    case GraphicsContext3D::UNSIGNED_INT_24_8:
-    case GraphicsContext3D::UNSIGNED_INT:
-        *bytesPerComponent = sizeof(GC3Duint);
-        break;
-    case GraphicsContext3D::FLOAT: // OES_texture_float
-        *bytesPerComponent = sizeof(GC3Dfloat);
-        break;
-    case GraphicsContext3D::HALF_FLOAT_OES: // OES_texture_half_float
-        *bytesPerComponent = sizeof(GC3Dhalffloat);
-        break;
-    default:
-        return false;
-    }
-    return true;
-}
-
-GC3Denum GraphicsContext3D::computeImageSizeInBytes(GC3Denum format, GC3Denum type, GC3Dsizei width, GC3Dsizei height, GC3Dint alignment,
-                                                    unsigned int* imageSizeInBytes, unsigned int* paddingInBytes)
-{
-    ASSERT(imageSizeInBytes);
-    ASSERT(alignment == 1 || alignment == 2 || alignment == 4 || alignment == 8);
-    if (width < 0 || height < 0)
-        return GraphicsContext3D::INVALID_VALUE;
-    unsigned int bytesPerComponent, componentsPerPixel;
-    if (!computeFormatAndTypeParameters(format, type, &bytesPerComponent, &componentsPerPixel))
-        return GraphicsContext3D::INVALID_ENUM;
-    if (!width || !height) {
-        *imageSizeInBytes = 0;
-        if (paddingInBytes)
-            *paddingInBytes = 0;
-        return GraphicsContext3D::NO_ERROR;
-    }
-    CheckedInt<uint32_t> checkedValue(bytesPerComponent * componentsPerPixel);
-    checkedValue *=  width;
-    if (!checkedValue.isValid())
-        return GraphicsContext3D::INVALID_VALUE;
-    unsigned int validRowSize = checkedValue.value();
-    unsigned int padding = 0;
-    unsigned int residual = validRowSize % alignment;
-    if (residual) {
-        padding = alignment - residual;
-        checkedValue += padding;
-    }
-    // Last row needs no padding.
-    checkedValue *= (height - 1);
-    checkedValue += validRowSize;
-    if (!checkedValue.isValid())
-        return GraphicsContext3D::INVALID_VALUE;
-    *imageSizeInBytes = checkedValue.value();
-    if (paddingInBytes)
-        *paddingInBytes = padding;
-    return GraphicsContext3D::NO_ERROR;
-}
-
-GraphicsContext3D::ImageExtractor::ImageExtractor(Image* image, ImageHtmlDomSource imageHtmlDomSource, bool premultiplyAlpha, bool ignoreGammaAndColorProfile)
-{
-    m_image = image;
-    m_imageHtmlDomSource = imageHtmlDomSource;
-    m_extractSucceeded = extractImage(premultiplyAlpha, ignoreGammaAndColorProfile);
-}
-
-GraphicsContext3D::ImageExtractor::~ImageExtractor()
-{
-    if (m_skiaImage)
-        m_skiaImage->bitmap().unlockPixels();
-}
-
-bool GraphicsContext3D::ImageExtractor::extractImage(bool premultiplyAlpha, bool ignoreGammaAndColorProfile)
-{
-    if (!m_image)
-        return false;
-    m_skiaImage = m_image->nativeImageForCurrentFrame();
-    m_alphaOp = AlphaDoNothing;
-    bool hasAlpha = m_skiaImage ? !m_skiaImage->bitmap().isOpaque() : true;
-    if ((!m_skiaImage || ignoreGammaAndColorProfile || (hasAlpha && !premultiplyAlpha)) && m_image->data()) {
-        // Attempt to get raw unpremultiplied image data.
-        OwnPtr<ImageDecoder> decoder(ImageDecoder::create(
-            *(m_image->data()), ImageSource::AlphaNotPremultiplied,
-            ignoreGammaAndColorProfile ? ImageSource::GammaAndColorProfileIgnored : ImageSource::GammaAndColorProfileApplied));
-        if (!decoder)
-            return false;
-        decoder->setData(m_image->data(), true);
-        if (!decoder->frameCount())
-            return false;
-        ImageFrame* frame = decoder->frameBufferAtIndex(0);
-        if (!frame || frame->status() != ImageFrame::FrameComplete)
-            return false;
-        hasAlpha = frame->hasAlpha();
-        m_nativeImage = frame->asNewNativeImage();
-        if (!m_nativeImage.get() || !m_nativeImage->isDataComplete() || !m_nativeImage->bitmap().width() || !m_nativeImage->bitmap().height())
-            return false;
-        SkBitmap::Config skiaConfig = m_nativeImage->bitmap().config();
-        if (skiaConfig != SkBitmap::kARGB_8888_Config)
-            return false;
-        m_skiaImage = m_nativeImage.get();
-        if (hasAlpha && premultiplyAlpha)
-            m_alphaOp = AlphaDoPremultiply;
-    } else if (!premultiplyAlpha && hasAlpha) {
-        // 1. For texImage2D with HTMLVideoElment input, assume no PremultiplyAlpha had been applied and the alpha value for each pixel is 0xFF
-        // which is true at present and may be changed in the future and needs adjustment accordingly.
-        // 2. For texImage2D with HTMLCanvasElement input in which Alpha is already Premultiplied in this port,
-        // do AlphaDoUnmultiply if UNPACK_PREMULTIPLY_ALPHA_WEBGL is set to false.
-        if (m_imageHtmlDomSource != HtmlDomVideo)
-            m_alphaOp = AlphaDoUnmultiply;
-    }
-    if (!m_skiaImage)
-        return false;
-
-    m_imageSourceFormat = SK_B32_SHIFT ? DataFormatRGBA8 : DataFormatBGRA8;
-    m_imageWidth = m_skiaImage->bitmap().width();
-    m_imageHeight = m_skiaImage->bitmap().height();
-    if (!m_imageWidth || !m_imageHeight)
-        return false;
-    m_imageSourceUnpackAlignment = 0;
-    m_skiaImage->bitmap().lockPixels();
-    m_imagePixelData = m_skiaImage->bitmap().getPixels();
-    return true;
-}
-
-bool GraphicsContext3D::packImageData(
-    Image* image,
-    const void* pixels,
-    GC3Denum format,
-    GC3Denum type,
-    bool flipY,
-    AlphaOp alphaOp,
-    DataFormat sourceFormat,
-    unsigned width,
-    unsigned height,
-    unsigned sourceUnpackAlignment,
-    Vector<uint8_t>& data)
-{
-    if (!pixels)
-        return false;
-
-    unsigned packedSize;
-    // Output data is tightly packed (alignment == 1).
-    if (computeImageSizeInBytes(format, type, width, height, 1, &packedSize, 0) != GraphicsContext3D::NO_ERROR)
-        return false;
-    data.resize(packedSize);
-
-    if (!packPixels(reinterpret_cast<const uint8_t*>(pixels), sourceFormat, width, height, sourceUnpackAlignment, format, type, alphaOp, data.data(), flipY))
-        return false;
-    if (ImageObserver *observer = image->imageObserver())
-        observer->didDraw(image);
-    return true;
-}
-
-bool GraphicsContext3D::extractImageData(ImageData* imageData,
-                                         GC3Denum format,
-                                         GC3Denum type,
-                                         bool flipY,
-                                         bool premultiplyAlpha,
-                                         Vector<uint8_t>& data)
-{
-    if (!imageData)
-        return false;
-    int width = imageData->width();
-    int height = imageData->height();
-
-    unsigned int packedSize;
-    // Output data is tightly packed (alignment == 1).
-    if (computeImageSizeInBytes(format, type, width, height, 1, &packedSize, 0) != GraphicsContext3D::NO_ERROR)
-        return false;
-    data.resize(packedSize);
-
-    if (!packPixels(imageData->data()->data(), DataFormatRGBA8, width, height, 0, format, type, premultiplyAlpha ? AlphaDoPremultiply : AlphaDoNothing, data.data(), flipY))
-        return false;
-
-    return true;
-}
-
-bool GraphicsContext3D::extractTextureData(unsigned int width, unsigned int height,
-                                           GC3Denum format, GC3Denum type,
-                                           unsigned int unpackAlignment,
-                                           bool flipY, bool premultiplyAlpha,
-                                           const void* pixels,
-                                           Vector<uint8_t>& data)
-{
-    // Assumes format, type, etc. have already been validated.
-    DataFormat sourceDataFormat = getDataFormat(format, type);
-
-    // Resize the output buffer.
-    unsigned int componentsPerPixel, bytesPerComponent;
-    if (!computeFormatAndTypeParameters(format, type,
-                                        &componentsPerPixel,
-                                        &bytesPerComponent))
-        return false;
-    unsigned int bytesPerPixel = componentsPerPixel * bytesPerComponent;
-    data.resize(width * height * bytesPerPixel);
-
-    if (!packPixels(static_cast<const uint8_t*>(pixels), sourceDataFormat, width, height, unpackAlignment, format, type, (premultiplyAlpha ? AlphaDoPremultiply : AlphaDoNothing), data.data(), flipY))
-        return false;
-
-    return true;
-}
-
-namespace {
-
 /* BEGIN CODE SHARED WITH MOZILLA FIREFOX */
 
 // The following packing and unpacking routines are expressed in terms of function templates and inline functions to achieve generality and speedup.
@@ -2333,7 +1460,96 @@ void FormatConverter::convert()
 
 } // anonymous namespace
 
-bool GraphicsContext3D::packPixels(const uint8_t* sourceData, DataFormat sourceDataFormat, unsigned width, unsigned height, unsigned sourceUnpackAlignment, unsigned destinationFormat, unsigned destinationType, AlphaOp alphaOp, void* destinationData, bool flipY)
+bool GraphicsContext3D::packImageData(
+    Image* image,
+    const void* pixels,
+    GC3Denum format,
+    GC3Denum type,
+    bool flipY,
+    AlphaOp alphaOp,
+    DataFormat sourceFormat,
+    unsigned width,
+    unsigned height,
+    unsigned sourceUnpackAlignment,
+    Vector<uint8_t>& data)
+{
+    if (!pixels)
+        return false;
+
+    unsigned packedSize;
+    // Output data is tightly packed (alignment == 1).
+    if (computeImageSizeInBytes(format, type, width, height, 1, &packedSize, 0) != GraphicsContext3D::NO_ERROR)
+        return false;
+    data.resize(packedSize);
+
+    if (!packPixels(reinterpret_cast<const uint8_t*>(pixels), sourceFormat, width, height, sourceUnpackAlignment, format, type, alphaOp, data.data(), flipY))
+        return false;
+    if (ImageObserver *observer = image->imageObserver())
+        observer->didDraw(image);
+    return true;
+}
+
+bool GraphicsContext3D::extractImageData(
+    ImageData* imageData,
+    GC3Denum format,
+    GC3Denum type,
+    bool flipY,
+    bool premultiplyAlpha,
+    Vector<uint8_t>& data)
+{
+    if (!imageData)
+        return false;
+    int width = imageData->width();
+    int height = imageData->height();
+
+    unsigned packedSize;
+    // Output data is tightly packed (alignment == 1).
+    if (computeImageSizeInBytes(format, type, width, height, 1, &packedSize, 0) != GraphicsContext3D::NO_ERROR)
+        return false;
+    data.resize(packedSize);
+
+    if (!packPixels(imageData->data()->data(), DataFormatRGBA8, width, height, 0, format, type, premultiplyAlpha ? AlphaDoPremultiply : AlphaDoNothing, data.data(), flipY))
+        return false;
+
+    return true;
+}
+
+bool GraphicsContext3D::extractTextureData(
+    unsigned width,
+    unsigned height,
+    GC3Denum format, GC3Denum type,
+    unsigned unpackAlignment,
+    bool flipY, bool premultiplyAlpha,
+    const void* pixels,
+    Vector<uint8_t>& data)
+{
+    // Assumes format, type, etc. have already been validated.
+    DataFormat sourceDataFormat = getDataFormat(format, type);
+
+    // Resize the output buffer.
+    unsigned int componentsPerPixel, bytesPerComponent;
+    if (!computeFormatAndTypeParameters(format, type, &componentsPerPixel, &bytesPerComponent))
+        return false;
+    unsigned bytesPerPixel = componentsPerPixel * bytesPerComponent;
+    data.resize(width * height * bytesPerPixel);
+
+    if (!packPixels(static_cast<const uint8_t*>(pixels), sourceDataFormat, width, height, unpackAlignment, format, type, (premultiplyAlpha ? AlphaDoPremultiply : AlphaDoNothing), data.data(), flipY))
+        return false;
+
+    return true;
+}
+
+bool GraphicsContext3D::packPixels(
+    const uint8_t* sourceData,
+    DataFormat sourceDataFormat,
+    unsigned width,
+    unsigned height,
+    unsigned sourceUnpackAlignment,
+    unsigned destinationFormat,
+    unsigned destinationType,
+    AlphaOp alphaOp,
+    void* destinationData,
+    bool flipY)
 {
     int validSrc = width * TexelBytesForFormat(sourceDataFormat);
     int remainder = sourceUnpackAlignment ? (validSrc % sourceUnpackAlignment) : 0;
@@ -2368,208 +1584,5 @@ bool GraphicsContext3D::packPixels(const uint8_t* sourceData, DataFormat sourceD
     return true;
 }
 
-unsigned GraphicsContext3D::getClearBitsByAttachmentType(GC3Denum attachment)
-{
-    switch (attachment) {
-    case GraphicsContext3D::COLOR_ATTACHMENT0:
-    case Extensions3D::COLOR_ATTACHMENT1_EXT:
-    case Extensions3D::COLOR_ATTACHMENT2_EXT:
-    case Extensions3D::COLOR_ATTACHMENT3_EXT:
-    case Extensions3D::COLOR_ATTACHMENT4_EXT:
-    case Extensions3D::COLOR_ATTACHMENT5_EXT:
-    case Extensions3D::COLOR_ATTACHMENT6_EXT:
-    case Extensions3D::COLOR_ATTACHMENT7_EXT:
-    case Extensions3D::COLOR_ATTACHMENT8_EXT:
-    case Extensions3D::COLOR_ATTACHMENT9_EXT:
-    case Extensions3D::COLOR_ATTACHMENT10_EXT:
-    case Extensions3D::COLOR_ATTACHMENT11_EXT:
-    case Extensions3D::COLOR_ATTACHMENT12_EXT:
-    case Extensions3D::COLOR_ATTACHMENT13_EXT:
-    case Extensions3D::COLOR_ATTACHMENT14_EXT:
-    case Extensions3D::COLOR_ATTACHMENT15_EXT:
-        return GraphicsContext3D::COLOR_BUFFER_BIT;
-    case GraphicsContext3D::DEPTH_ATTACHMENT:
-        return GraphicsContext3D::DEPTH_BUFFER_BIT;
-    case GraphicsContext3D::STENCIL_ATTACHMENT:
-        return GraphicsContext3D::STENCIL_BUFFER_BIT;
-    case GraphicsContext3D::DEPTH_STENCIL_ATTACHMENT:
-        return GraphicsContext3D::DEPTH_BUFFER_BIT | GraphicsContext3D::STENCIL_BUFFER_BIT;
-    default:
-        return 0;
-    }
-}
-
-unsigned GraphicsContext3D::getClearBitsByFormat(GC3Denum format)
-{
-    switch (format) {
-    case GraphicsContext3D::ALPHA:
-    case GraphicsContext3D::LUMINANCE:
-    case GraphicsContext3D::LUMINANCE_ALPHA:
-    case GraphicsContext3D::RGB:
-    case GraphicsContext3D::RGB565:
-    case GraphicsContext3D::RGBA:
-    case GraphicsContext3D::RGBA4:
-    case GraphicsContext3D::RGB5_A1:
-        return GraphicsContext3D::COLOR_BUFFER_BIT;
-    case GraphicsContext3D::DEPTH_COMPONENT16:
-    case GraphicsContext3D::DEPTH_COMPONENT:
-        return GraphicsContext3D::DEPTH_BUFFER_BIT;
-    case GraphicsContext3D::STENCIL_INDEX8:
-        return GraphicsContext3D::STENCIL_BUFFER_BIT;
-    case GraphicsContext3D::DEPTH_STENCIL:
-        return GraphicsContext3D::DEPTH_BUFFER_BIT | GraphicsContext3D::STENCIL_BUFFER_BIT;
-    default:
-        return 0;
-    }
-}
-
-unsigned GraphicsContext3D::getChannelBitsByFormat(GC3Denum format)
-{
-    switch (format) {
-    case GraphicsContext3D::ALPHA:
-        return ChannelAlpha;
-    case GraphicsContext3D::LUMINANCE:
-        return ChannelRGB;
-    case GraphicsContext3D::LUMINANCE_ALPHA:
-        return ChannelRGBA;
-    case GraphicsContext3D::RGB:
-    case GraphicsContext3D::RGB565:
-        return ChannelRGB;
-    case GraphicsContext3D::RGBA:
-    case GraphicsContext3D::RGBA4:
-    case GraphicsContext3D::RGB5_A1:
-        return ChannelRGBA;
-    case GraphicsContext3D::DEPTH_COMPONENT16:
-    case GraphicsContext3D::DEPTH_COMPONENT:
-        return ChannelDepth;
-    case GraphicsContext3D::STENCIL_INDEX8:
-        return ChannelStencil;
-    case GraphicsContext3D::DEPTH_STENCIL:
-        return ChannelDepth | ChannelStencil;
-    default:
-        return 0;
-    }
-}
-
-void GraphicsContext3D::paintFramebufferToCanvas(int framebuffer, int width, int height, bool premultiplyAlpha, ImageBuffer* imageBuffer)
-{
-    unsigned char* pixels = 0;
-    size_t bufferSize = 4 * width * height;
-
-    const SkBitmap* canvasBitmap = imageBuffer->context()->bitmap();
-    const SkBitmap* readbackBitmap = 0;
-    ASSERT(canvasBitmap->config() == SkBitmap::kARGB_8888_Config);
-    if (canvasBitmap->width() == width && canvasBitmap->height() == height) {
-        // This is the fastest and most common case. We read back
-        // directly into the canvas's backing store.
-        readbackBitmap = canvasBitmap;
-        m_resizingBitmap.reset();
-    } else {
-        // We need to allocate a temporary bitmap for reading back the
-        // pixel data. We will then use Skia to rescale this bitmap to
-        // the size of the canvas's backing store.
-        if (m_resizingBitmap.width() != width || m_resizingBitmap.height() != height) {
-            m_resizingBitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height);
-            if (!m_resizingBitmap.allocPixels())
-                return;
-        }
-        readbackBitmap = &m_resizingBitmap;
-    }
-
-    // Read back the frame buffer.
-    SkAutoLockPixels bitmapLock(*readbackBitmap);
-    pixels = static_cast<unsigned char*>(readbackBitmap->getPixels());
-
-    m_impl->readBackFramebuffer(pixels, 4 * width * height, framebuffer, width, height);
-
-    if (premultiplyAlpha) {
-        for (size_t i = 0; i < bufferSize; i += 4) {
-            pixels[i + 0] = std::min(255, pixels[i + 0] * pixels[i + 3] / 255);
-            pixels[i + 1] = std::min(255, pixels[i + 1] * pixels[i + 3] / 255);
-            pixels[i + 2] = std::min(255, pixels[i + 2] * pixels[i + 3] / 255);
-        }
-    }
-
-    readbackBitmap->notifyPixelsChanged();
-    if (m_resizingBitmap.readyToDraw()) {
-        // We need to draw the resizing bitmap into the canvas's backing store.
-        SkCanvas canvas(*canvasBitmap);
-        SkRect dst;
-        dst.set(SkIntToScalar(0), SkIntToScalar(0), SkIntToScalar(canvasBitmap->width()), SkIntToScalar(canvasBitmap->height()));
-        canvas.drawBitmapRect(m_resizingBitmap, 0, dst);
-    }
-}
-
-namespace {
-
-void splitStringHelper(const String& str, HashSet<String>& set)
-{
-    Vector<String> substrings;
-    str.split(" ", substrings);
-    for (size_t i = 0; i < substrings.size(); ++i)
-        set.add(substrings[i]);
-}
-
-String mapExtensionName(const String& name)
-{
-    if (name == "GL_ANGLE_framebuffer_blit"
-        || name == "GL_ANGLE_framebuffer_multisample")
-        return "GL_CHROMIUM_framebuffer_multisample";
-    return name;
-}
-
-} // anonymous namespace
-
-void GraphicsContext3D::initializeExtensions()
-{
-    if (m_initializedAvailableExtensions)
-        return;
-
-    m_initializedAvailableExtensions = true;
-    bool success = m_impl->makeContextCurrent();
-    ASSERT(success);
-    if (!success)
-        return;
-
-    String extensionsString = m_impl->getString(GraphicsContext3D::EXTENSIONS);
-    splitStringHelper(extensionsString, m_enabledExtensions);
-
-    String requestableExtensionsString = m_impl->getRequestableExtensionsCHROMIUM();
-    splitStringHelper(requestableExtensionsString, m_requestableExtensions);
-}
-
-
-bool GraphicsContext3D::supportsExtension(const String& name)
-{
-    initializeExtensions();
-    String mappedName = mapExtensionName(name);
-    return m_enabledExtensions.contains(mappedName) || m_requestableExtensions.contains(mappedName);
-}
-
-bool GraphicsContext3D::ensureExtensionEnabled(const String& name)
-{
-    initializeExtensions();
-
-    String mappedName = mapExtensionName(name);
-    if (m_enabledExtensions.contains(mappedName))
-        return true;
-
-    if (m_requestableExtensions.contains(mappedName)) {
-        m_impl->requestExtensionCHROMIUM(mappedName.ascii().data());
-        m_enabledExtensions.clear();
-        m_requestableExtensions.clear();
-        m_initializedAvailableExtensions = false;
-    }
-
-    initializeExtensions();
-    return m_enabledExtensions.contains(mappedName);
-}
-
-bool GraphicsContext3D::isExtensionEnabled(const String& name)
-{
-    initializeExtensions();
-    String mappedName = mapExtensionName(name);
-    return m_enabledExtensions.contains(mappedName);
-}
-
 } // namespace WebCore
+