Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/graphics/GraphicsContext3D.h

Index: Source/core/platform/graphics/GraphicsContext3D.h
diff --git a/Source/core/platform/graphics/GraphicsContext3D.h b/Source/core/platform/graphics/GraphicsContext3D.h
deleted file mode 100644
index f976a12cb8e806aef681a74b3f4a5d602c869a65..0000000000000000000000000000000000000000
--- a/Source/core/platform/graphics/GraphicsContext3D.h
+++ /dev/null
@@ -1,862 +0,0 @@
-/*
- * Copyright (C) 2009 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * 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.
- */
-
-#ifndef GraphicsContext3D_h
-#define GraphicsContext3D_h
-
-#include "core/platform/graphics/Extensions3D.h"
-#include "core/platform/graphics/Image.h"
-#include "platform/geometry/IntRect.h"
-#include "platform/graphics/GraphicsTypes3D.h"
-#include "platform/weborigin/KURL.h"
-#include "third_party/skia/include/core/SkBitmap.h"
-#include "wtf/HashMap.h"
-#include "wtf/HashSet.h"
-#include "wtf/ListHashSet.h"
-#include "wtf/Noncopyable.h"
-#include "wtf/OwnPtr.h"
-#include "wtf/PassOwnPtr.h"
-#include "wtf/RefCounted.h"
-#include "wtf/text/WTFString.h"
-
-// FIXME: Find a better way to avoid the name confliction for NO_ERROR.
-#if OS(WIN)
-#undef NO_ERROR
-#endif
-
-class GrContext;
-
-namespace blink {
-class WebGraphicsContext3D;
-class WebGraphicsContext3DProvider;
-}
-
-namespace WebCore {
-class DrawingBuffer;
-class Extensions3D;
-class GraphicsContext3DContextLostCallbackAdapter;
-class GraphicsContext3DErrorMessageCallbackAdapter;
-class Image;
-class ImageBuffer;
-class IntRect;
-class IntSize;
-
-struct ActiveInfo {
-    String name;
-    GC3Denum type;
-    GC3Dint size;
-};
-
-class GraphicsContext3D : public RefCounted<GraphicsContext3D> {
-public:
-    enum {
-        DEPTH_BUFFER_BIT = 0x00000100,
-        STENCIL_BUFFER_BIT = 0x00000400,
-        COLOR_BUFFER_BIT = 0x00004000,
-        POINTS = 0x0000,
-        LINES = 0x0001,
-        LINE_LOOP = 0x0002,
-        LINE_STRIP = 0x0003,
-        TRIANGLES = 0x0004,
-        TRIANGLE_STRIP = 0x0005,
-        TRIANGLE_FAN = 0x0006,
-        ZERO = 0,
-        ONE = 1,
-        SRC_COLOR = 0x0300,
-        ONE_MINUS_SRC_COLOR = 0x0301,
-        SRC_ALPHA = 0x0302,
-        ONE_MINUS_SRC_ALPHA = 0x0303,
-        DST_ALPHA = 0x0304,
-        ONE_MINUS_DST_ALPHA = 0x0305,
-        DST_COLOR = 0x0306,
-        ONE_MINUS_DST_COLOR = 0x0307,
-        SRC_ALPHA_SATURATE = 0x0308,
-        FUNC_ADD = 0x8006,
-        BLEND_EQUATION = 0x8009,
-        BLEND_EQUATION_RGB = 0x8009,
-        BLEND_EQUATION_ALPHA = 0x883D,
-        FUNC_SUBTRACT = 0x800A,
-        FUNC_REVERSE_SUBTRACT = 0x800B,
-        BLEND_DST_RGB = 0x80C8,
-        BLEND_SRC_RGB = 0x80C9,
-        BLEND_DST_ALPHA = 0x80CA,
-        BLEND_SRC_ALPHA = 0x80CB,
-        CONSTANT_COLOR = 0x8001,
-        ONE_MINUS_CONSTANT_COLOR = 0x8002,
-        CONSTANT_ALPHA = 0x8003,
-        ONE_MINUS_CONSTANT_ALPHA = 0x8004,
-        BLEND_COLOR = 0x8005,
-        ARRAY_BUFFER = 0x8892,
-        ELEMENT_ARRAY_BUFFER = 0x8893,
-        ARRAY_BUFFER_BINDING = 0x8894,
-        ELEMENT_ARRAY_BUFFER_BINDING = 0x8895,
-        STREAM_DRAW = 0x88E0,
-        STATIC_DRAW = 0x88E4,
-        DYNAMIC_DRAW = 0x88E8,
-        BUFFER_SIZE = 0x8764,
-        BUFFER_USAGE = 0x8765,
-        CURRENT_VERTEX_ATTRIB = 0x8626,
-        FRONT = 0x0404,
-        BACK = 0x0405,
-        FRONT_AND_BACK = 0x0408,
-        TEXTURE_2D = 0x0DE1,
-        CULL_FACE = 0x0B44,
-        BLEND = 0x0BE2,
-        DITHER = 0x0BD0,
-        STENCIL_TEST = 0x0B90,
-        DEPTH_TEST = 0x0B71,
-        SCISSOR_TEST = 0x0C11,
-        POLYGON_OFFSET_FILL = 0x8037,
-        SAMPLE_ALPHA_TO_COVERAGE = 0x809E,
-        SAMPLE_COVERAGE = 0x80A0,
-        NO_ERROR = 0,
-        INVALID_ENUM = 0x0500,
-        INVALID_VALUE = 0x0501,
-        INVALID_OPERATION = 0x0502,
-        OUT_OF_MEMORY = 0x0505,
-        CW = 0x0900,
-        CCW = 0x0901,
-        LINE_WIDTH = 0x0B21,
-        ALIASED_POINT_SIZE_RANGE = 0x846D,
-        ALIASED_LINE_WIDTH_RANGE = 0x846E,
-        CULL_FACE_MODE = 0x0B45,
-        FRONT_FACE = 0x0B46,
-        DEPTH_RANGE = 0x0B70,
-        DEPTH_WRITEMASK = 0x0B72,
-        DEPTH_CLEAR_VALUE = 0x0B73,
-        DEPTH_FUNC = 0x0B74,
-        STENCIL_CLEAR_VALUE = 0x0B91,
-        STENCIL_FUNC = 0x0B92,
-        STENCIL_FAIL = 0x0B94,
-        STENCIL_PASS_DEPTH_FAIL = 0x0B95,
-        STENCIL_PASS_DEPTH_PASS = 0x0B96,
-        STENCIL_REF = 0x0B97,
-        STENCIL_VALUE_MASK = 0x0B93,
-        STENCIL_WRITEMASK = 0x0B98,
-        STENCIL_BACK_FUNC = 0x8800,
-        STENCIL_BACK_FAIL = 0x8801,
-        STENCIL_BACK_PASS_DEPTH_FAIL = 0x8802,
-        STENCIL_BACK_PASS_DEPTH_PASS = 0x8803,
-        STENCIL_BACK_REF = 0x8CA3,
-        STENCIL_BACK_VALUE_MASK = 0x8CA4,
-        STENCIL_BACK_WRITEMASK = 0x8CA5,
-        VIEWPORT = 0x0BA2,
-        SCISSOR_BOX = 0x0C10,
-        COLOR_CLEAR_VALUE = 0x0C22,
-        COLOR_WRITEMASK = 0x0C23,
-        UNPACK_ALIGNMENT = 0x0CF5,
-        PACK_ALIGNMENT = 0x0D05,
-        MAX_TEXTURE_SIZE = 0x0D33,
-        MAX_VIEWPORT_DIMS = 0x0D3A,
-        SUBPIXEL_BITS = 0x0D50,
-        RED_BITS = 0x0D52,
-        GREEN_BITS = 0x0D53,
-        BLUE_BITS = 0x0D54,
-        ALPHA_BITS = 0x0D55,
-        DEPTH_BITS = 0x0D56,
-        STENCIL_BITS = 0x0D57,
-        POLYGON_OFFSET_UNITS = 0x2A00,
-        POLYGON_OFFSET_FACTOR = 0x8038,
-        TEXTURE_BINDING_2D = 0x8069,
-        SAMPLE_BUFFERS = 0x80A8,
-        SAMPLES = 0x80A9,
-        SAMPLE_COVERAGE_VALUE = 0x80AA,
-        SAMPLE_COVERAGE_INVERT = 0x80AB,
-        NUM_COMPRESSED_TEXTURE_FORMATS = 0x86A2,
-        COMPRESSED_TEXTURE_FORMATS = 0x86A3,
-        DONT_CARE = 0x1100,
-        FASTEST = 0x1101,
-        NICEST = 0x1102,
-        GENERATE_MIPMAP_HINT = 0x8192,
-        BYTE = 0x1400,
-        UNSIGNED_BYTE = 0x1401,
-        SHORT = 0x1402,
-        UNSIGNED_SHORT = 0x1403,
-        INT = 0x1404,
-        UNSIGNED_INT = 0x1405,
-        FLOAT = 0x1406,
-        HALF_FLOAT_OES = 0x8D61,
-        FIXED = 0x140C,
-        DEPTH_COMPONENT = 0x1902,
-        ALPHA = 0x1906,
-        RGB = 0x1907,
-        RGBA = 0x1908,
-        BGRA = 0x80E1,
-        LUMINANCE = 0x1909,
-        LUMINANCE_ALPHA = 0x190A,
-        UNSIGNED_SHORT_4_4_4_4 = 0x8033,
-        UNSIGNED_SHORT_5_5_5_1 = 0x8034,
-        UNSIGNED_SHORT_5_6_5 = 0x8363,
-        FRAGMENT_SHADER = 0x8B30,
-        VERTEX_SHADER = 0x8B31,
-        MAX_VERTEX_ATTRIBS = 0x8869,
-        MAX_VERTEX_UNIFORM_VECTORS = 0x8DFB,
-        MAX_VARYING_VECTORS = 0x8DFC,
-        MAX_COMBINED_TEXTURE_IMAGE_UNITS = 0x8B4D,
-        MAX_VERTEX_TEXTURE_IMAGE_UNITS = 0x8B4C,
-        MAX_TEXTURE_IMAGE_UNITS = 0x8872,
-        MAX_FRAGMENT_UNIFORM_VECTORS = 0x8DFD,
-        SHADER_TYPE = 0x8B4F,
-        DELETE_STATUS = 0x8B80,
-        LINK_STATUS = 0x8B82,
-        VALIDATE_STATUS = 0x8B83,
-        ATTACHED_SHADERS = 0x8B85,
-        ACTIVE_UNIFORMS = 0x8B86,
-        ACTIVE_UNIFORM_MAX_LENGTH = 0x8B87,
-        ACTIVE_ATTRIBUTES = 0x8B89,
-        ACTIVE_ATTRIBUTE_MAX_LENGTH = 0x8B8A,
-        SHADING_LANGUAGE_VERSION = 0x8B8C,
-        CURRENT_PROGRAM = 0x8B8D,
-        NEVER = 0x0200,
-        LESS = 0x0201,
-        EQUAL = 0x0202,
-        LEQUAL = 0x0203,
-        GREATER = 0x0204,
-        NOTEQUAL = 0x0205,
-        GEQUAL = 0x0206,
-        ALWAYS = 0x0207,
-        KEEP = 0x1E00,
-        REPLACE = 0x1E01,
-        INCR = 0x1E02,
-        DECR = 0x1E03,
-        INVERT = 0x150A,
-        INCR_WRAP = 0x8507,
-        DECR_WRAP = 0x8508,
-        VENDOR = 0x1F00,
-        RENDERER = 0x1F01,
-        VERSION = 0x1F02,
-        EXTENSIONS = 0x1F03,
-        NEAREST = 0x2600,
-        LINEAR = 0x2601,
-        NEAREST_MIPMAP_NEAREST = 0x2700,
-        LINEAR_MIPMAP_NEAREST = 0x2701,
-        NEAREST_MIPMAP_LINEAR = 0x2702,
-        LINEAR_MIPMAP_LINEAR = 0x2703,
-        TEXTURE_MAG_FILTER = 0x2800,
-        TEXTURE_MIN_FILTER = 0x2801,
-        TEXTURE_WRAP_S = 0x2802,
-        TEXTURE_WRAP_T = 0x2803,
-        TEXTURE = 0x1702,
-        TEXTURE_CUBE_MAP = 0x8513,
-        TEXTURE_BINDING_CUBE_MAP = 0x8514,
-        TEXTURE_CUBE_MAP_POSITIVE_X = 0x8515,
-        TEXTURE_CUBE_MAP_NEGATIVE_X = 0x8516,
-        TEXTURE_CUBE_MAP_POSITIVE_Y = 0x8517,
-        TEXTURE_CUBE_MAP_NEGATIVE_Y = 0x8518,
-        TEXTURE_CUBE_MAP_POSITIVE_Z = 0x8519,
-        TEXTURE_CUBE_MAP_NEGATIVE_Z = 0x851A,
-        MAX_CUBE_MAP_TEXTURE_SIZE = 0x851C,
-        TEXTURE0 = 0x84C0,
-        TEXTURE1 = 0x84C1,
-        TEXTURE2 = 0x84C2,
-        TEXTURE3 = 0x84C3,
-        TEXTURE4 = 0x84C4,
-        TEXTURE5 = 0x84C5,
-        TEXTURE6 = 0x84C6,
-        TEXTURE7 = 0x84C7,
-        TEXTURE8 = 0x84C8,
-        TEXTURE9 = 0x84C9,
-        TEXTURE10 = 0x84CA,
-        TEXTURE11 = 0x84CB,
-        TEXTURE12 = 0x84CC,
-        TEXTURE13 = 0x84CD,
-        TEXTURE14 = 0x84CE,
-        TEXTURE15 = 0x84CF,
-        TEXTURE16 = 0x84D0,
-        TEXTURE17 = 0x84D1,
-        TEXTURE18 = 0x84D2,
-        TEXTURE19 = 0x84D3,
-        TEXTURE20 = 0x84D4,
-        TEXTURE21 = 0x84D5,
-        TEXTURE22 = 0x84D6,
-        TEXTURE23 = 0x84D7,
-        TEXTURE24 = 0x84D8,
-        TEXTURE25 = 0x84D9,
-        TEXTURE26 = 0x84DA,
-        TEXTURE27 = 0x84DB,
-        TEXTURE28 = 0x84DC,
-        TEXTURE29 = 0x84DD,
-        TEXTURE30 = 0x84DE,
-        TEXTURE31 = 0x84DF,
-        ACTIVE_TEXTURE = 0x84E0,
-        REPEAT = 0x2901,
-        CLAMP_TO_EDGE = 0x812F,
-        MIRRORED_REPEAT = 0x8370,
-        FLOAT_VEC2 = 0x8B50,
-        FLOAT_VEC3 = 0x8B51,
-        FLOAT_VEC4 = 0x8B52,
-        INT_VEC2 = 0x8B53,
-        INT_VEC3 = 0x8B54,
-        INT_VEC4 = 0x8B55,
-        BOOL = 0x8B56,
-        BOOL_VEC2 = 0x8B57,
-        BOOL_VEC3 = 0x8B58,
-        BOOL_VEC4 = 0x8B59,
-        FLOAT_MAT2 = 0x8B5A,
-        FLOAT_MAT3 = 0x8B5B,
-        FLOAT_MAT4 = 0x8B5C,
-        SAMPLER_2D = 0x8B5E,
-        SAMPLER_CUBE = 0x8B60,
-        VERTEX_ATTRIB_ARRAY_ENABLED = 0x8622,
-        VERTEX_ATTRIB_ARRAY_SIZE = 0x8623,
-        VERTEX_ATTRIB_ARRAY_STRIDE = 0x8624,
-        VERTEX_ATTRIB_ARRAY_TYPE = 0x8625,
-        VERTEX_ATTRIB_ARRAY_NORMALIZED = 0x886A,
-        VERTEX_ATTRIB_ARRAY_POINTER = 0x8645,
-        VERTEX_ATTRIB_ARRAY_BUFFER_BINDING = 0x889F,
-        COMPILE_STATUS = 0x8B81,
-        INFO_LOG_LENGTH = 0x8B84,
-        SHADER_SOURCE_LENGTH = 0x8B88,
-        SHADER_COMPILER = 0x8DFA,
-        SHADER_BINARY_FORMATS = 0x8DF8,
-        NUM_SHADER_BINARY_FORMATS = 0x8DF9,
-        LOW_FLOAT = 0x8DF0,
-        MEDIUM_FLOAT = 0x8DF1,
-        HIGH_FLOAT = 0x8DF2,
-        LOW_INT = 0x8DF3,
-        MEDIUM_INT = 0x8DF4,
-        HIGH_INT = 0x8DF5,
-        FRAMEBUFFER = 0x8D40,
-        RENDERBUFFER = 0x8D41,
-        RGBA4 = 0x8056,
-        RGB5_A1 = 0x8057,
-        RGB565 = 0x8D62,
-        DEPTH_COMPONENT16 = 0x81A5,
-        STENCIL_INDEX = 0x1901,
-        STENCIL_INDEX8 = 0x8D48,
-        DEPTH_STENCIL = 0x84F9,
-        UNSIGNED_INT_24_8 = 0x84FA,
-        DEPTH24_STENCIL8 = 0x88F0,
-        RENDERBUFFER_WIDTH = 0x8D42,
-        RENDERBUFFER_HEIGHT = 0x8D43,
-        RENDERBUFFER_INTERNAL_FORMAT = 0x8D44,
-        RENDERBUFFER_RED_SIZE = 0x8D50,
-        RENDERBUFFER_GREEN_SIZE = 0x8D51,
-        RENDERBUFFER_BLUE_SIZE = 0x8D52,
-        RENDERBUFFER_ALPHA_SIZE = 0x8D53,
-        RENDERBUFFER_DEPTH_SIZE = 0x8D54,
-        RENDERBUFFER_STENCIL_SIZE = 0x8D55,
-        FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = 0x8CD0,
-        FRAMEBUFFER_ATTACHMENT_OBJECT_NAME = 0x8CD1,
-        FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL = 0x8CD2,
-        FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE = 0x8CD3,
-        COLOR_ATTACHMENT0 = 0x8CE0,
-        DEPTH_ATTACHMENT = 0x8D00,
-        STENCIL_ATTACHMENT = 0x8D20,
-        DEPTH_STENCIL_ATTACHMENT = 0x821A,
-        NONE = 0,
-        FRAMEBUFFER_COMPLETE = 0x8CD5,
-        FRAMEBUFFER_INCOMPLETE_ATTACHMENT = 0x8CD6,
-        FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT = 0x8CD7,
-        FRAMEBUFFER_INCOMPLETE_DIMENSIONS = 0x8CD9,
-        FRAMEBUFFER_UNSUPPORTED = 0x8CDD,
-        FRAMEBUFFER_BINDING = 0x8CA6,
-        RENDERBUFFER_BINDING = 0x8CA7,
-        MAX_RENDERBUFFER_SIZE = 0x84E8,
-        INVALID_FRAMEBUFFER_OPERATION = 0x0506,
-
-        // WebGL-specific enums
-        UNPACK_FLIP_Y_WEBGL = 0x9240,
-        UNPACK_PREMULTIPLY_ALPHA_WEBGL = 0x9241,
-        CONTEXT_LOST_WEBGL = 0x9242,
-        UNPACK_COLORSPACE_CONVERSION_WEBGL = 0x9243,
-        BROWSER_DEFAULT_WEBGL = 0x9244
-    };
-
-    // Context creation attributes.
-    struct Attributes {
-        Attributes()
-            : alpha(true)
-            , depth(true)
-            , stencil(false)
-            , antialias(true)
-            , premultipliedAlpha(true)
-            , preserveDrawingBuffer(false)
-            , noExtensions(false)
-            , shareResources(true)
-            , preferDiscreteGPU(false)
-            , failIfMajorPerformanceCaveat(false)
-        {
-        }
-
-        bool alpha;
-        bool depth;
-        bool stencil;
-        bool antialias;
-        bool premultipliedAlpha;
-        bool preserveDrawingBuffer;
-        bool noExtensions;
-        bool shareResources;
-        bool preferDiscreteGPU;
-        bool failIfMajorPerformanceCaveat;
-        KURL topDocumentURL;
-    };
-
-    class ContextLostCallback {
-    public:
-        virtual void onContextLost() = 0;
-        virtual ~ContextLostCallback() {}
-    };
-
-    class ErrorMessageCallback {
-    public:
-        virtual void onErrorMessage(const String& message, GC3Dint id) = 0;
-        virtual ~ErrorMessageCallback() { }
-    };
-
-    void setContextLostCallback(PassOwnPtr<ContextLostCallback>);
-    void setErrorMessageCallback(PassOwnPtr<ErrorMessageCallback>);
-
-    static PassRefPtr<GraphicsContext3D> create(Attributes);
-
-    // Callers must make the context current before using it AND check that the context was created successfully
-    // via ContextLost before using the context in any way. Once made current on a thread, the context cannot
-    // be used on any other thread.
-    static PassRefPtr<GraphicsContext3D> createGraphicsContextFromWebContext(PassOwnPtr<blink::WebGraphicsContext3D>, bool preserveDrawingBuffer = false);
-    static PassRefPtr<GraphicsContext3D> createGraphicsContextFromProvider(PassOwnPtr<blink::WebGraphicsContext3DProvider>, bool preserveDrawingBuffer = false);
-
-    ~GraphicsContext3D();
-
-    GrContext* grContext();
-    blink::WebGraphicsContext3D* webContext() const { return m_impl; }
-
-    bool makeContextCurrent();
-
-    uint32_t lastFlushID();
-
-    // Helper to texImage2D with pixel==0 case: pixels are initialized to 0.
-    // Return true if no GL error is synthesized.
-    // By default, alignment is 4, the OpenGL default setting.
-    bool texImage2DResourceSafe(GC3Denum target, GC3Dint level, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height, GC3Dint border, GC3Denum format, GC3Denum type, GC3Dint alignment = 4);
-
-    //----------------------------------------------------------------------
-    // Helpers for texture uploading and pixel readback.
-    //
-
-    // Computes the components per pixel and bytes per component
-    // for the given format and type combination. Returns false if
-    // either was an invalid enum.
-    static bool computeFormatAndTypeParameters(GC3Denum format,
-                                               GC3Denum type,
-                                               unsigned int* componentsPerPixel,
-                                               unsigned int* bytesPerComponent);
-
-    // Computes the image size in bytes. If paddingInBytes is not null, padding
-    // is also calculated in return. Returns NO_ERROR if succeed, otherwise
-    // return the suggested GL error indicating the cause of the failure:
-    //   INVALID_VALUE if width/height is negative or overflow happens.
-    //   INVALID_ENUM if format/type is illegal.
-    static GC3Denum computeImageSizeInBytes(GC3Denum format,
-                                     GC3Denum type,
-                                     GC3Dsizei width,
-                                     GC3Dsizei height,
-                                     GC3Dint alignment,
-                                     unsigned int* imageSizeInBytes,
-                                     unsigned int* paddingInBytes);
-
-    // Attempt to enumerate all possible native image formats to
-    // reduce the amount of temporary allocations during texture
-    // uploading. This enum must be public because it is accessed
-    // by non-member functions.
-    enum DataFormat {
-        DataFormatRGBA8 = 0,
-        DataFormatRGBA16F,
-        DataFormatRGBA32F,
-        DataFormatRGB8,
-        DataFormatRGB16F,
-        DataFormatRGB32F,
-        DataFormatBGR8,
-        DataFormatBGRA8,
-        DataFormatARGB8,
-        DataFormatABGR8,
-        DataFormatRGBA5551,
-        DataFormatRGBA4444,
-        DataFormatRGB565,
-        DataFormatR8,
-        DataFormatR16F,
-        DataFormatR32F,
-        DataFormatRA8,
-        DataFormatRA16F,
-        DataFormatRA32F,
-        DataFormatAR8,
-        DataFormatA8,
-        DataFormatA16F,
-        DataFormatA32F,
-        DataFormatNumFormats
-    };
-
-    // Check if the format is one of the formats from the ImageData or DOM elements.
-    // The formats from ImageData is always RGBA8.
-    // The formats from DOM elements vary with Graphics ports. It can only be RGBA8 or BGRA8.
-    static ALWAYS_INLINE bool srcFormatComeFromDOMElementOrImageData(DataFormat SrcFormat)
-    {
-    return SrcFormat == DataFormatBGRA8 || SrcFormat == DataFormatRGBA8;
-    }
-
-    //----------------------------------------------------------------------
-    // Entry points for WebGL.
-    //
-
-    void activeTexture(GC3Denum texture);
-    void attachShader(Platform3DObject program, Platform3DObject shader);
-    void bindAttribLocation(Platform3DObject, GC3Duint index, const String& name);
-    void bindBuffer(GC3Denum target, Platform3DObject);
-    void bindFramebuffer(GC3Denum target, Platform3DObject);
-    void bindRenderbuffer(GC3Denum target, Platform3DObject);
-    void bindTexture(GC3Denum target, Platform3DObject);
-    void blendColor(GC3Dclampf red, GC3Dclampf green, GC3Dclampf blue, GC3Dclampf alpha);
-    void blendEquation(GC3Denum mode);
-    void blendEquationSeparate(GC3Denum modeRGB, GC3Denum modeAlpha);
-    void blendFunc(GC3Denum sfactor, GC3Denum dfactor);
-    void blendFuncSeparate(GC3Denum srcRGB, GC3Denum dstRGB, GC3Denum srcAlpha, GC3Denum dstAlpha);
-
-    void bufferData(GC3Denum target, GC3Dsizeiptr size, GC3Denum usage);
-    void bufferData(GC3Denum target, GC3Dsizeiptr size, const void* data, GC3Denum usage);
-    void bufferSubData(GC3Denum target, GC3Dintptr offset, GC3Dsizeiptr size, const void* data);
-
-    GC3Denum checkFramebufferStatus(GC3Denum target);
-    void clear(GC3Dbitfield mask);
-    void clearColor(GC3Dclampf red, GC3Dclampf green, GC3Dclampf blue, GC3Dclampf alpha);
-    void clearDepth(GC3Dclampf depth);
-    void clearStencil(GC3Dint s);
-    void colorMask(GC3Dboolean red, GC3Dboolean green, GC3Dboolean blue, GC3Dboolean alpha);
-    void compileShader(Platform3DObject);
-
-    void compressedTexImage2D(GC3Denum target, GC3Dint level, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height, GC3Dint border, GC3Dsizei imageSize, const void* data);
-    void compressedTexSubImage2D(GC3Denum target, GC3Dint level, GC3Dint xoffset, GC3Dint yoffset, GC3Dsizei width, GC3Dsizei height, GC3Denum format, GC3Dsizei imageSize, const void* data);
-    void copyTexImage2D(GC3Denum target, GC3Dint level, GC3Denum internalformat, GC3Dint x, GC3Dint y, GC3Dsizei width, GC3Dsizei height, GC3Dint border);
-    void copyTexSubImage2D(GC3Denum target, GC3Dint level, GC3Dint xoffset, GC3Dint yoffset, GC3Dint x, GC3Dint y, GC3Dsizei width, GC3Dsizei height);
-    void cullFace(GC3Denum mode);
-    void depthFunc(GC3Denum func);
-    void depthMask(GC3Dboolean flag);
-    void depthRange(GC3Dclampf zNear, GC3Dclampf zFar);
-    void detachShader(Platform3DObject, Platform3DObject);
-    void disable(GC3Denum cap);
-    void disableVertexAttribArray(GC3Duint index);
-    void drawArrays(GC3Denum mode, GC3Dint first, GC3Dsizei count);
-    void drawElements(GC3Denum mode, GC3Dsizei count, GC3Denum type, GC3Dintptr offset);
-
-    void enable(GC3Denum cap);
-    void enableVertexAttribArray(GC3Duint index);
-    void finish();
-    void flush();
-    void framebufferRenderbuffer(GC3Denum target, GC3Denum attachment, GC3Denum renderbuffertarget, Platform3DObject);
-    void framebufferTexture2D(GC3Denum target, GC3Denum attachment, GC3Denum textarget, Platform3DObject, GC3Dint level);
-    void frontFace(GC3Denum mode);
-    void generateMipmap(GC3Denum target);
-
-    bool getActiveAttrib(Platform3DObject program, GC3Duint index, ActiveInfo&);
-    bool getActiveUniform(Platform3DObject program, GC3Duint index, ActiveInfo&);
-    void getAttachedShaders(Platform3DObject program, GC3Dsizei maxCount, GC3Dsizei* count, Platform3DObject* shaders);
-    GC3Dint getAttribLocation(Platform3DObject, const String& name);
-    void getBooleanv(GC3Denum pname, GC3Dboolean* value);
-    void getBufferParameteriv(GC3Denum target, GC3Denum pname, GC3Dint* value);
-    Attributes getContextAttributes();
-    GC3Denum getError();
-    void getFloatv(GC3Denum pname, GC3Dfloat* value);
-    void getFramebufferAttachmentParameteriv(GC3Denum target, GC3Denum attachment, GC3Denum pname, GC3Dint* value);
-    void getIntegerv(GC3Denum pname, GC3Dint* value);
-    void getProgramiv(Platform3DObject program, GC3Denum pname, GC3Dint* value);
-    String getProgramInfoLog(Platform3DObject);
-    void getRenderbufferParameteriv(GC3Denum target, GC3Denum pname, GC3Dint* value);
-    void getShaderiv(Platform3DObject, GC3Denum pname, GC3Dint* value);
-    String getShaderInfoLog(Platform3DObject);
-    void getShaderPrecisionFormat(GC3Denum shaderType, GC3Denum precisionType, GC3Dint* range, GC3Dint* precision);
-    String getShaderSource(Platform3DObject);
-    String getString(GC3Denum name);
-    void getTexParameterfv(GC3Denum target, GC3Denum pname, GC3Dfloat* value);
-    void getTexParameteriv(GC3Denum target, GC3Denum pname, GC3Dint* value);
-    void getUniformfv(Platform3DObject program, GC3Dint location, GC3Dfloat* value);
-    void getUniformiv(Platform3DObject program, GC3Dint location, GC3Dint* value);
-    GC3Dint getUniformLocation(Platform3DObject, const String& name);
-    void getVertexAttribfv(GC3Duint index, GC3Denum pname, GC3Dfloat* value);
-    void getVertexAttribiv(GC3Duint index, GC3Denum pname, GC3Dint* value);
-    GC3Dsizeiptr getVertexAttribOffset(GC3Duint index, GC3Denum pname);
-
-    void hint(GC3Denum target, GC3Denum mode);
-    GC3Dboolean isBuffer(Platform3DObject);
-    GC3Dboolean isEnabled(GC3Denum cap);
-    GC3Dboolean isFramebuffer(Platform3DObject);
-    GC3Dboolean isProgram(Platform3DObject);
-    GC3Dboolean isRenderbuffer(Platform3DObject);
-    GC3Dboolean isShader(Platform3DObject);
-    GC3Dboolean isTexture(Platform3DObject);
-    void lineWidth(GC3Dfloat);
-    void linkProgram(Platform3DObject);
-    void pixelStorei(GC3Denum pname, GC3Dint param);
-    void polygonOffset(GC3Dfloat factor, GC3Dfloat units);
-
-    void readPixels(GC3Dint x, GC3Dint y, GC3Dsizei width, GC3Dsizei height, GC3Denum format, GC3Denum type, void* data);
-
-    void releaseShaderCompiler();
-
-    void renderbufferStorage(GC3Denum target, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height);
-    void sampleCoverage(GC3Dclampf value, GC3Dboolean invert);
-    void scissor(GC3Dint x, GC3Dint y, GC3Dsizei width, GC3Dsizei height);
-    void shaderSource(Platform3DObject, const String& string);
-    void stencilFunc(GC3Denum func, GC3Dint ref, GC3Duint mask);
-    void stencilFuncSeparate(GC3Denum face, GC3Denum func, GC3Dint ref, GC3Duint mask);
-    void stencilMask(GC3Duint mask);
-    void stencilMaskSeparate(GC3Denum face, GC3Duint mask);
-    void stencilOp(GC3Denum fail, GC3Denum zfail, GC3Denum zpass);
-    void stencilOpSeparate(GC3Denum face, GC3Denum fail, GC3Denum zfail, GC3Denum zpass);
-
-    void texImage2D(GC3Denum target, GC3Dint level, GC3Denum internalformat, GC3Dsizei width, GC3Dsizei height, GC3Dint border, GC3Denum format, GC3Denum type, const void* pixels);
-    void texParameterf(GC3Denum target, GC3Denum pname, GC3Dfloat param);
-    void texParameteri(GC3Denum target, GC3Denum pname, GC3Dint param);
-    void texSubImage2D(GC3Denum target, GC3Dint level, GC3Dint xoffset, GC3Dint yoffset, GC3Dsizei width, GC3Dsizei height, GC3Denum format, GC3Denum type, const void* pixels);
-
-    void uniform1f(GC3Dint location, GC3Dfloat x);
-    void uniform1fv(GC3Dint location, GC3Dsizei, GC3Dfloat* v);
-    void uniform1i(GC3Dint location, GC3Dint x);
-    void uniform1iv(GC3Dint location, GC3Dsizei, GC3Dint* v);
-    void uniform2f(GC3Dint location, GC3Dfloat x, GC3Dfloat y);
-    void uniform2fv(GC3Dint location, GC3Dsizei, GC3Dfloat* v);
-    void uniform2i(GC3Dint location, GC3Dint x, GC3Dint y);
-    void uniform2iv(GC3Dint location, GC3Dsizei, GC3Dint* v);
-    void uniform3f(GC3Dint location, GC3Dfloat x, GC3Dfloat y, GC3Dfloat z);
-    void uniform3fv(GC3Dint location, GC3Dsizei, GC3Dfloat* v);
-    void uniform3i(GC3Dint location, GC3Dint x, GC3Dint y, GC3Dint z);
-    void uniform3iv(GC3Dint location, GC3Dsizei, GC3Dint* v);
-    void uniform4f(GC3Dint location, GC3Dfloat x, GC3Dfloat y, GC3Dfloat z, GC3Dfloat w);
-    void uniform4fv(GC3Dint location, GC3Dsizei, GC3Dfloat* v);
-    void uniform4i(GC3Dint location, GC3Dint x, GC3Dint y, GC3Dint z, GC3Dint w);
-    void uniform4iv(GC3Dint location, GC3Dsizei, GC3Dint* v);
-    void uniformMatrix2fv(GC3Dint location, GC3Dsizei, GC3Dboolean transpose, GC3Dfloat* value);
-    void uniformMatrix3fv(GC3Dint location, GC3Dsizei, GC3Dboolean transpose, GC3Dfloat* value);
-    void uniformMatrix4fv(GC3Dint location, GC3Dsizei, GC3Dboolean transpose, GC3Dfloat* value);
-
-    void useProgram(Platform3DObject);
-    void validateProgram(Platform3DObject);
-
-    void vertexAttrib1f(GC3Duint index, GC3Dfloat x);
-    void vertexAttrib1fv(GC3Duint index, GC3Dfloat* values);
-    void vertexAttrib2f(GC3Duint index, GC3Dfloat x, GC3Dfloat y);
-    void vertexAttrib2fv(GC3Duint index, GC3Dfloat* values);
-    void vertexAttrib3f(GC3Duint index, GC3Dfloat x, GC3Dfloat y, GC3Dfloat z);
-    void vertexAttrib3fv(GC3Duint index, GC3Dfloat* values);
-    void vertexAttrib4f(GC3Duint index, GC3Dfloat x, GC3Dfloat y, GC3Dfloat z, GC3Dfloat w);
-    void vertexAttrib4fv(GC3Duint index, GC3Dfloat* values);
-    void vertexAttribPointer(GC3Duint index, GC3Dint size, GC3Denum type, GC3Dboolean normalized,
-                             GC3Dsizei stride, GC3Dintptr offset);
-
-    void viewport(GC3Dint x, GC3Dint y, GC3Dsizei width, GC3Dsizei height);
-
-    void markContextChanged();
-    void markLayerComposited();
-    bool layerComposited() const;
-
-    void paintRenderingResultsToCanvas(ImageBuffer*, DrawingBuffer*);
-    PassRefPtr<Uint8ClampedArray> paintRenderingResultsToImageData(DrawingBuffer*, int&, int&);
-
-    // Support for buffer creation and deletion
-    Platform3DObject createBuffer();
-    Platform3DObject createFramebuffer();
-    Platform3DObject createProgram();
-    Platform3DObject createRenderbuffer();
-    Platform3DObject createShader(GC3Denum);
-    Platform3DObject createTexture();
-
-    void deleteBuffer(Platform3DObject);
-    void deleteFramebuffer(Platform3DObject);
-    void deleteProgram(Platform3DObject);
-    void deleteRenderbuffer(Platform3DObject);
-    void deleteShader(Platform3DObject);
-    void deleteTexture(Platform3DObject);
-
-    // Synthesizes an OpenGL error which will be returned from a
-    // later call to getError. This is used to emulate OpenGL ES
-    // 2.0 behavior on the desktop and to enforce additional error
-    // checking mandated by WebGL.
-    //
-    // Per the behavior of glGetError, this stores at most one
-    // instance of any given error, and returns them from calls to
-    // getError in the order they were added.
-    void synthesizeGLError(GC3Denum error);
-
-    // Support for extensions. Returns a non-null object, though not
-    // all methods it contains may necessarily be supported on the
-    // current hardware. Must call Extensions3D::supports() to
-    // determine this.
-    Extensions3D* extensions();
-
-    static unsigned getClearBitsByFormat(GC3Denum);
-
-    enum ChannelBits {
-        ChannelRed = 1,
-        ChannelGreen = 2,
-        ChannelBlue = 4,
-        ChannelAlpha = 8,
-        ChannelDepth = 16,
-        ChannelStencil = 32,
-        ChannelRGB = ChannelRed | ChannelGreen | ChannelBlue,
-        ChannelRGBA = ChannelRGB | ChannelAlpha,
-    };
-
-    static unsigned getChannelBitsByFormat(GC3Denum);
-
-    // Possible alpha operations that may need to occur during
-    // pixel packing. FIXME: kAlphaDoUnmultiply is lossy and must
-    // be removed.
-    enum AlphaOp {
-        AlphaDoNothing = 0,
-        AlphaDoPremultiply = 1,
-        AlphaDoUnmultiply = 2
-    };
-
-    enum ImageHtmlDomSource {
-        HtmlDomImage = 0,
-        HtmlDomCanvas = 1,
-        HtmlDomVideo = 2,
-        HtmlDomNone = 3
-    };
-
-    class ImageExtractor {
-    public:
-        ImageExtractor(Image*, ImageHtmlDomSource, bool premultiplyAlpha, bool ignoreGammaAndColorProfile);
-
-        ~ImageExtractor();
-
-        bool extractSucceeded() { return m_extractSucceeded; }
-        const void* imagePixelData() { return m_imagePixelData; }
-        unsigned imageWidth() { return m_imageWidth; }
-        unsigned imageHeight() { return m_imageHeight; }
-        DataFormat imageSourceFormat() { return m_imageSourceFormat; }
-        AlphaOp imageAlphaOp() { return m_alphaOp; }
-        unsigned imageSourceUnpackAlignment() { return m_imageSourceUnpackAlignment; }
-        ImageHtmlDomSource imageHtmlDomSource() { return m_imageHtmlDomSource; }
-    private:
-        // Extract the image and keeps track of its status, such as width, height, Source Alignment, format and AlphaOp etc.
-        // This needs to lock the resources or relevant data if needed and return true upon success
-        bool extractImage(bool premultiplyAlpha, bool ignoreGammaAndColorProfile);
-
-        RefPtr<NativeImageSkia> m_nativeImage;
-        RefPtr<NativeImageSkia> m_skiaImage;
-        Image* m_image;
-        ImageHtmlDomSource m_imageHtmlDomSource;
-        bool m_extractSucceeded;
-        const void* m_imagePixelData;
-        unsigned m_imageWidth;
-        unsigned m_imageHeight;
-        DataFormat m_imageSourceFormat;
-        AlphaOp m_alphaOp;
-        unsigned m_imageSourceUnpackAlignment;
-    };
-
-    // The Following functions are implemented in GraphicsContext3DImagePacking.cpp
-
-    // Packs the contents of the given Image which is passed in |pixels| into the passed Vector
-    // according to the given format and type, and obeying the flipY and AlphaOp flags.
-    // Returns true upon success.
-    static bool packImageData(Image*, const void* pixels, GC3Denum format, GC3Denum type, bool flipY, AlphaOp, DataFormat sourceFormat, unsigned width, unsigned height, unsigned sourceUnpackAlignment, Vector<uint8_t>& data);
-
-    // Extracts the contents of the given ImageData into the passed Vector,
-    // packing the pixel data according to the given format and type,
-    // and obeying the flipY and premultiplyAlpha flags. Returns true
-    // upon success.
-    static bool extractImageData(const uint8_t*, const IntSize&, GC3Denum format, GC3Denum type, bool flipY, bool premultiplyAlpha, Vector<uint8_t>& data);
-
-    // Helper function which extracts the user-supplied texture
-    // data, applying the flipY and premultiplyAlpha parameters.
-    // If the data is not tightly packed according to the passed
-    // unpackAlignment, the output data will be tightly packed.
-    // Returns true if successful, false if any error occurred.
-    static bool extractTextureData(unsigned width, unsigned height, GC3Denum format, GC3Denum type, unsigned unpackAlignment, bool flipY, bool premultiplyAlpha, const void* pixels, Vector<uint8_t>& data);
-
-    // End GraphicsContext3DImagePacking.cpp functions
-
-    // This is the order of bytes to use when doing a readback.
-    enum ReadbackOrder {
-        ReadbackRGBA,
-        ReadbackSkia
-    };
-
-    // Helper function which does a readback from the currently-bound
-    // framebuffer into a buffer of a certain size with 4-byte pixels.
-    void readBackFramebuffer(unsigned char* pixels, int width, int height, ReadbackOrder, AlphaOp);
-
-private:
-    friend class Extensions3D;
-
-    GraphicsContext3D(PassOwnPtr<blink::WebGraphicsContext3D>, bool preserveDrawingBuffer);
-    GraphicsContext3D(PassOwnPtr<blink::WebGraphicsContext3DProvider>, bool preserveDrawingBuffer);
-
-    // Helper for packImageData/extractImageData/extractTextureData which implement packing of pixel
-    // data into the specified OpenGL destination format and type.
-    // A sourceUnpackAlignment of zero indicates that the source
-    // data is tightly packed. Non-zero values may take a slow path.
-    // Destination data will have no gaps between rows.
-    // Implemented in GraphicsContext3DImagePacking.cpp
-    static bool packPixels(const uint8_t* sourceData, DataFormat sourceDataFormat, unsigned width, unsigned height, unsigned sourceUnpackAlignment, unsigned destinationFormat, unsigned destinationType, AlphaOp, void* destinationData, bool flipY);
-
-    void paintFramebufferToCanvas(int framebuffer, int width, int height, bool premultiplyAlpha, ImageBuffer*);
-    // Helper function to flip a bitmap vertically.
-    void flipVertically(uint8_t* data, int width, int height);
-
-    // Extensions3D support.
-    bool supportsExtension(const String& name);
-    bool ensureExtensionEnabled(const String& name);
-    bool isExtensionEnabled(const String& name);
-
-    void initializeExtensions();
-
-    bool preserveDrawingBuffer() const { return m_preserveDrawingBuffer; }
-
-    OwnPtr<blink::WebGraphicsContext3DProvider> m_provider;
-    blink::WebGraphicsContext3D* m_impl;
-    OwnPtr<GraphicsContext3DContextLostCallbackAdapter> m_contextLostCallbackAdapter;
-    OwnPtr<GraphicsContext3DErrorMessageCallbackAdapter> m_errorMessageCallbackAdapter;
-    OwnPtr<blink::WebGraphicsContext3D> m_ownedWebContext;
-    OwnPtr<Extensions3D> m_extensions;
-    bool m_initializedAvailableExtensions;
-    HashSet<String> m_enabledExtensions;
-    HashSet<String> m_requestableExtensions;
-    bool m_layerComposited;
-    bool m_preserveDrawingBuffer;
-    int m_packAlignment;
-
-    enum ResourceSafety {
-        ResourceSafetyUnknown,
-        ResourceSafe,
-        ResourceUnsafe
-    };
-    ResourceSafety m_resourceSafety;
-
-    // If the width and height of the Canvas's backing store don't
-    // match those that we were given in the most recent call to
-    // reshape(), then we need an intermediate bitmap to read back the
-    // frame buffer into. This seems to happen when CSS styles are
-    // used to resize the Canvas.
-    SkBitmap m_resizingBitmap;
-
-    GrContext* m_grContext;
-
-    // Used to flip a bitmap vertically.
-    Vector<uint8_t> m_scanline;
-};
-
-} // namespace WebCore
-
-#endif // GraphicsContext3D_h