2014/10/15 下午 10:05:02

iphone Programming Glossary: cgdataprovidercopydata

How to change thin image to fat image in iPhone SDK?

http://stackoverflow.com/questions/10186200/how-to-change-thin-image-to-fat-image-in-iphone-sdk

colors from the image. UIImage image UIImage imageNamed @ foo.png CGImageRef imageRef image.CGImage NSData data NSData CGDataProviderCopyData CGImageGetDataProvider imageRef char pixels char data bytes this is where you manipulate the individual pixels assumes a..

How to NSLog pixel RGB from a UIImage?

http://stackoverflow.com/questions/1352989/how-to-nslog-pixel-rgb-from-a-uiimage

the following code to do this Be Specific Please UIImage modifyPixels UIImage originalImage NSData pixelData NSData CGDataProviderCopyData CGImageGetDataProvider originalImage.CGImage uint myLength pixelData length for int i 0 i myLength i 4 CHANGE PIXELS HERE..

How to get the RGB values for a pixel on an image on the iphone

http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone

to return the bitmap pixel data Get the bitmap data from the receiver's CGImage see UIImage docs self setBitmapData CGDataProviderCopyData CGImageGetDataProvider self CGImage Create a buffer to store bitmap data unitialized memory as long as the data self setPixelBitData..

Getting pixel data from UIImageView — works on simulator, not device

http://stackoverflow.com/questions/1911360/getting-pixel-data-from-uiimageview-works-on-simulator-not-device

floor point.y if x width y height CGDataProviderRef provider CGImageGetDataProvider cgImage CFDataRef bitmapData CGDataProviderCopyData provider const UInt8 data CFDataGetBytePtr bitmapData size_t offset width y x 4 UInt8 red data offset UInt8 blue data offset..

iPhone SDK: accessing indexed color PNG images

http://stackoverflow.com/questions/3251595/iphone-sdk-accessing-indexed-color-png-images

you end up with is an indexed one then use CGImageGetDataProvider to get a CGDataProviderRef which you can use with CGDataProviderCopyData to get to the actual bitmap data... edit a bounty always gets things going. I tested and it just works. sorry for the crappy.. how you access the bitmap data. ASCII art ftw CGDataProviderRef data CGImageGetDataProvider img NSData nsdata NSData CGDataProviderCopyData data char rawbuf malloc nsdata length if rawbuf printf rawbuf failed n nsdata getBytes rawbuf int w CGImageGetWidth img..

Encoding images to video with ffmpeg

http://stackoverflow.com/questions/3334939/encoding-images-to-video-with-ffmpeg

newCgImage image CGImage CGDataProviderRef dataProvider CGImageGetDataProvider newCgImage CFDataRef bitmapData CGDataProviderCopyData dataProvider buffer uint8_t CFDataGetBytePtr bitmapData avpicture_fill AVPicture picture buffer PIX_FMT_RGB8 c width c height..

Image processing Glamour filter in iphone

http://stackoverflow.com/questions/3549396/image-processing-glamour-filter-in-iphone

image CGImageRef cgImage image CGImage CGDataProviderRef provider CGImageGetDataProvider cgImage CFDataRef bitmapData CGDataProviderCopyData provider UInt8 data UInt8 CFDataGetBytePtr bitmapData int width image.size.width int height image.size.height NSInteger..

Getting RGB pixel data from CGImage

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

UIImage theImage UIImage imageNamed @ rgb.png CGImageRef cgImageRef CGImageRetain theImage.CGImage CFDataRef imageData CGDataProviderCopyData CGImageGetDataProvider cgImageRef NSLog @ the data @ imageData This then logs the data 010002fe fffdff02 0200fe04 0003fc.. kCGBitmapByteOrder32Big YES NO CGDataProviderRef provider CGImageGetDataProvider cgimage NSData data id CGDataProviderCopyData provider data autorelease const uint8_t bytes data bytes printf Pixel Data n for size_t row 0 row height row for size_t..

image manipulation using slider in iphone

http://stackoverflow.com/questions/8880109/image-manipulation-using-slider-in-iphone

iphone ios ios4 share improve this question here is the code CGImageRef inImage currentImage.CGImage CFDataRef ref CGDataProviderCopyData CGImageGetDataProvider inImage UInt8 buf UInt8 CFDataGetBytePtr ref int length CFDataGetLength ref float value2 1 slider.value..

Dispelling the UIImage imageNamed: FUD

http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud

is worth the maintentace but here it is for completeness. CGImageRef originalImage uiImage.CGImage CFDataRef imageData CGDataProviderCopyData CGImageGetDataProvider originalImage CGDataProviderRef imageDataProvider CGDataProviderCreateWithCFData imageData CFRelease..