2014/10/15 下午 10:05:12

iphone Programming Glossary: col

fastest way to draw a screen buffer on the iphone

http://stackoverflow.com/questions/2395650/fastest-way-to-draw-a-screen-buffer-on-the-iphone

imageDataSize for int i 0 i imageDataSize 4 i unsigned int imageData i 0xFFFF00FF just set it to some random init color currently yellow CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceRGB dataProvider CGDataProviderCreateDirect imageData.. 4 i unsigned int imageData i 0xFFFF00FF just set it to some random init color currently yellow CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceRGB dataProvider CGDataProviderCreateDirect imageData imageDataSize providerCallbacks currently.. imageData imageDataSize providerCallbacks currently global cgIm CGImageCreate 320 480 8 32 320 4 colorSpace kCGImageAlphaNone kCGBitmapByteOrder32Little dataProvider 0 false kCGRenderingIntentDefault also global probably..

Is it possible to tile images in a UIScrollView without having to manually create all the tiles?

http://stackoverflow.com/questions/3337870/is-it-possible-to-tile-images-in-a-uiscrollview-without-having-to-manually-creat

large images on the fly Edit Here is the code from Deepa's answer below UIImage tileForScale float scale row int row col int col size CGSize tileSize image UIImage inImage CGRect subRect CGRectMake col tileSize.width row tileSize.height tileSize.width.. images on the fly Edit Here is the code from Deepa's answer below UIImage tileForScale float scale row int row col int col size CGSize tileSize image UIImage inImage CGRect subRect CGRectMake col tileSize.width row tileSize.height tileSize.width.. tileForScale float scale row int row col int col size CGSize tileSize image UIImage inImage CGRect subRect CGRectMake col tileSize.width row tileSize.height tileSize.width tileSize.height CGImageRef tiledImage CGImageCreateWithImageInRect inImage..

Drawing in CATiledLayer with CoreGraphics CGContextDrawImage

http://stackoverflow.com/questions/4067512/drawing-in-catiledlayer-with-coregraphics-cgcontextdrawimage

layer CGSize tileSize tiledLayer.tileSize tileSize.width scale tileSize.height scale calculate the rows and columns of tiles that intersect the rect we have been asked to draw int firstCol floorf CGRectGetMinX rect tileSize.width int.. tileSize.height int lastRow floorf CGRectGetMaxY rect 1 tileSize.height for int row firstRow row lastRow row for int col firstCol col lastCol col if row 0 continue UIImage tile self tileForScale scale row row col col CGImageRef tileRef tile.. int lastRow floorf CGRectGetMaxY rect 1 tileSize.height for int row firstRow row lastRow row for int col firstCol col lastCol col if row 0 continue UIImage tile self tileForScale scale row row col col CGImageRef tileRef tile CGImage CGRect..

Getting RGB pixel data from CGImage

http://stackoverflow.com/questions/6073259/getting-rgb-pixel-data-from-cgimage

on images with alpha channels as well as images without. The code will even work on images that are not in the RGB color space though I doubt you'd be likely to get any of those on iOS. Copy paste it into your project and try to run it against.. data autorelease const uint8_t bytes data bytes printf Pixel Data n for size_t row 0 row height row for size_t col 0 col width col const uint8_t pixel bytes row bpr col bytes_per_pixel printf for size_t x 0 x bytes_per_pixel x printf.. data autorelease const uint8_t bytes data bytes printf Pixel Data n for size_t row 0 row height row for size_t col 0 col width col const uint8_t pixel bytes row bpr col bytes_per_pixel printf for size_t x 0 x bytes_per_pixel x printf .2X..