2014/10/15 下午 10:05:04

iphone Programming Glossary: cgimagegetdataprovider

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

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 4 byte pixel consisting..

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

maskRef CGImageGetBitsPerComponent maskRef CGImageGetBitsPerPixel maskRef CGImageGetBytesPerRow maskRef CGImageGetDataProvider maskRef NULL false CGImageRef masked CGImageCreateWithMask image CGImage mask return UIImage imageWithCGImage masked here's..

How can i add two uiimageview and save it to iphone photo gallery in iphone application development?

http://stackoverflow.com/questions/12453913/how-can-i-add-two-uiimageview-and-save-it-to-iphone-photo-gallery-in-iphone-appl

How to NSLog pixel RGB from a UIImage?

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

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 Sidenote Just show me..

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

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 malloc CFDataGetLength..

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

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

Inner Shadow in UILabel

http://stackoverflow.com/questions/3231690/inner-shadow-in-uilabel

shape CGImageGetBitsPerComponent shape CGImageGetBitsPerPixel shape CGImageGetBytesPerRow shape CGImageGetDataProvider shape NULL false return mask void drawRect CGRect rect UIFont font UIFont fontWithName @ HelveticaNeue Bold size 40.0f CGSize..

iPhone SDK: accessing indexed color PNG images

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

Use CGColorSpaceGetModel CGImageGetColorSpace img to see if the color space 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.. 300 1 bit colormap non interlaced edit^2 This is 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..

UIImage - implementing an auto levels algorithm

http://stackoverflow.com/questions/3278560/uiimage-implementing-an-auto-levels-algorithm

origImage CGImageGetBytesPerRow origImage CGImageGetColorSpace origImage CGImageGetBitmapInfo origImage CGImageGetDataProvider origImage decode YES CGImageGetRenderingIntent origImage Where whitePoint is a float between 0.0 and 1.0 that determines..

Encoding images to video with ffmpeg

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

imageNamed NSString stringWithFormat @ 10 d i CGImageRef newCgImage image CGImage CGDataProviderRef dataProvider CGImageGetDataProvider newCgImage CFDataRef bitmapData CGDataProviderCopyData dataProvider buffer uint8_t CFDataGetBytePtr bitmapData avpicture_fill..

Image processing Glamour filter in iphone

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

code for sepia image UIImage makeSepiaScale UIImage image CGImageRef cgImage image CGImage CGDataProviderRef provider CGImageGetDataProvider cgImage CFDataRef bitmapData CGDataProviderCopyData provider UInt8 data UInt8 CFDataGetBytePtr bitmapData int width image.size.width..

CGImageCreateWithMask works great but the masked out area is black in my resulting image, how can I set it to be white?

http://stackoverflow.com/questions/3848430/cgimagecreatewithmask-works-great-but-the-masked-out-area-is-black-in-my-resulti

maskRef CGImageGetBitsPerComponent maskRef CGImageGetBitsPerPixel maskRef CGImageGetBytesPerRow maskRef CGImageGetDataProvider maskRef nil YES UIImage image UIImage imageWithContentsOfFile path CGImageRef masked CGImageCreateWithMask image CGImage..

how to add watermark on a exist image

http://stackoverflow.com/questions/4068035/how-to-add-watermark-on-a-exist-image

How to Mask an UIImageView

http://stackoverflow.com/questions/5757386/how-to-mask-an-uiimageview

maskRef CGImageGetBitsPerComponent maskRef CGImageGetBitsPerPixel maskRef CGImageGetBytesPerRow maskRef CGImageGetDataProvider maskRef NULL false CGImageRef maskedImageRef CGImageCreateWithMask image CGImage mask UIImage maskedImage UIImage imageWithCGImage..

Getting RGB pixel data from CGImage

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

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 The image is a 5x1 png.. kCGBitmapByteOrder16Big YES NO info kCGBitmapByteOrderMask kCGBitmapByteOrder32Big YES NO CGDataProviderRef provider CGImageGetDataProvider cgimage NSData data id CGDataProviderCopyData provider data autorelease const uint8_t bytes data bytes printf Pixel Data..

Is there an SDK to draw lines on iOS with touch?

http://stackoverflow.com/questions/6774352/is-there-an-sdk-to-draw-lines-on-ios-with-touch

Dispelling the UIImage imageNamed: FUD

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

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

How to mask an image in IOS sdk?

http://stackoverflow.com/questions/9872975/how-to-mask-an-image-in-ios-sdk