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2014/10/15 ¤U¤È 10:05:13

iphone Programming Glossary: colourspace

Any idea why this image masking code does not work?

http://stackoverflow.com/questions/1133248/any-idea-why-this-image-masking-code-does-not-work

kCFAllocatorDefault 0 CFDataSetLength dataBuffer bufferSize the data will be 8 bits per pixel no alpha CGColorSpaceRef colourSpace CGColorSpaceCreateDeviceGray CGContextRef ctx CGBitmapContextCreate CFDataGetMutableBytePtr dataBuffer maskWidth maskHeight.. CGContextRef ctx CGBitmapContextCreate CFDataGetMutableBytePtr dataBuffer maskWidth maskHeight 8 bytesPerRow colourSpace kCGImageAlphaNone drawing into this context will draw into the dataBuffer. CGContextDrawImage ctx CGRectMake 0 0 maskWidth..

Create new UIImage by adding shadow to existing UIImage

http://stackoverflow.com/questions/2936443/create-new-uiimage-by-adding-shadow-to-existing-uiimage

to it then return a whole new UIImage shadow and all. This is what I'm trying UIImage imageWithShadow CGColorSpaceRef colourSpace CGColorSpaceCreateDeviceRGB CGContextRef shadowContext CGBitmapContextCreate NULL self.size.width self.size.height 1 CGImageGetBitsPerComponent.. CGBitmapContextCreate NULL self.size.width self.size.height 1 CGImageGetBitsPerComponent self.CGImage 0 colourSpace kCGImageAlphaPremultipliedLast CGColorSpaceRelease colourSpace CGContextSetShadow shadowContext CGSizeMake 0 1 1 CGContextDrawImage.. 1 CGImageGetBitsPerComponent self.CGImage 0 colourSpace kCGImageAlphaPremultipliedLast CGColorSpaceRelease colourSpace CGContextSetShadow shadowContext CGSizeMake 0 1 1 CGContextDrawImage shadowContext CGRectMake 0 0 self.size.width self.size.height..

Render contents of UIView as an OpenGL texture

http://stackoverflow.com/questions/4118778/render-contents-of-uiview-as-an-opengl-texture

malloc 4 view.bounds.size.width view.bounds.size.height create a suitable CoreGraphics context CGColorSpaceRef colourSpace CGColorSpaceCreateDeviceRGB CGContextRef context CGBitmapContextCreate pixelBuffer view.bounds.size.width view.bounds.size.height.. context CGBitmapContextCreate pixelBuffer view.bounds.size.width view.bounds.size.height 8 4 view.bounds.size.width colourSpace kCGImageAlphaPremultipliedLast kCGBitmapByteOrder32Big CGColorSpaceRelease colourSpace draw the view to the buffer view.layer.. 8 4 view.bounds.size.width colourSpace kCGImageAlphaPremultipliedLast kCGBitmapByteOrder32Big CGColorSpaceRelease colourSpace draw the view to the buffer view.layer renderInContext context upload to OpenGL glTexImage2D GL_TEXTURE_2D 0 GL_RGBA view.bounds.size.width..

Is programmatically inverting the colors of an image possible?

http://stackoverflow.com/questions/6672517/is-programmatically-inverting-the-colors-of-an-image-possible

size.width int height size.height Create a suitable RGB alpha bitmap context in BGRA colour space CGColorSpaceRef colourSpace CGColorSpaceCreateDeviceRGB unsigned char memoryPool unsigned char calloc width height 4 1 CGContextRef context CGBitmapContextCreate.. unsigned char calloc width height 4 1 CGContextRef context CGBitmapContextCreate memoryPool width height 8 width 4 colourSpace kCGBitmapByteOrder32Big kCGImageAlphaPremultipliedLast CGColorSpaceRelease colourSpace draw the current image to the newly.. width height 8 width 4 colourSpace kCGBitmapByteOrder32Big kCGImageAlphaPremultipliedLast CGColorSpaceRelease colourSpace draw the current image to the newly created context CGContextDrawImage context CGRectMake 0 0 width height self CGImage..