diff options
Diffstat (limited to 'WebCore/platform/graphics/GraphicsContext3D.h')
| -rw-r--r-- | WebCore/platform/graphics/GraphicsContext3D.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/WebCore/platform/graphics/GraphicsContext3D.h b/WebCore/platform/graphics/GraphicsContext3D.h index b7be8fc..0a41dc6 100644 --- a/WebCore/platform/graphics/GraphicsContext3D.h +++ b/WebCore/platform/graphics/GraphicsContext3D.h @@ -419,6 +419,43 @@ namespace WebCore { // like GL_FLOAT, GL_INT, etc. int sizeInBytes(int type); + //---------------------------------------------------------------------- + // Helpers for texture uploading. + // + + // Extracts the contents of the given Image into the passed + // Vector, obeying the flipY and premultiplyAlpha flags. + // Returns the applicable OpenGL format and internalFormat for + // the subsequent glTexImage2D or glTexSubImage2D call. + // Returns true upon success. + bool extractImageData(Image* image, + bool flipY, + bool premultiplyAlpha, + Vector<uint8_t>& imageData, + unsigned int* format, + unsigned int* internalFormat); + + // Processes the given image data in preparation for uploading + // via texImage2D or texSubImage2D. The input data must be in + // 4-component format with the alpha channel last (i.e., RGBA + // or BGRA), tightly packed, with no space between rows. + + enum AlphaOp { + kAlphaDoNothing = 0, + kAlphaDoPremultiply = 1, + kAlphaDoUnmultiply = 2 + }; + + void processImageData(uint8_t* imageData, + unsigned width, + unsigned height, + bool flipVertically, + AlphaOp alphaOp); + + //---------------------------------------------------------------------- + // Entry points for WebGL. + // + void activeTexture(unsigned long texture); void attachShader(WebGLProgram* program, WebGLShader* shader); void bindAttribLocation(WebGLProgram*, unsigned long index, const String& name); @@ -624,6 +661,34 @@ namespace WebCore { private: GraphicsContext3D(Attributes attrs); + // Helpers for texture uploading. + void premultiplyAlpha(unsigned char* rgbaData, int numPixels); + void unmultiplyAlpha(uint8_t* imageData, int numPixels); + + // Each platform must provide an implementation of this method. + // + // Gets the data for the given Image into outputVector, + // without doing any processing of the data (vertical flip or + // otherwise). + // + // premultiplyAlpha indicates whether the user will eventually + // want the alpha channel multiplied into the color channels. + // + // The out parameter hasAlphaChannel indicates whether the + // image actually had an alpha channel. + // + // The out parameter neededAlphaOp should be passed to a + // subsequent call of processImageData. + // + // The out parameter format should be passed to subsequent + // invocations of texImage2D and texSubImage2D. + bool getImageData(Image* image, + Vector<uint8_t>& outputVector, + bool premultiplyAlpha, + bool* hasAlphaChannel, + AlphaOp* neededAlphaOp, + unsigned int* format); + int m_currentWidth, m_currentHeight; #if PLATFORM(MAC) |