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2014/10/15 ¤U¤È 10:05:01
iphone Programming Glossary: cgcontextreleaseRetrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage CGColorSpaceRelease colorSpace CGContextDrawImage context CGRectMake 0 0 width height image CGContextRelease context I then calculate the array index for the given alpha channel using the coordinates from the..
Resizing UIimages pulled from the Camera also ROTATES the UIimage? http://stackoverflow.com/questions/1260249/resizing-uiimages-pulled-from-the-camera-also-rotates-the-uiimage CGImageRef ref CGBitmapContextCreateImage bitmap UIImage result UIImage imageWithCGImage ref CGContextRelease bitmap CGImageRelease ref return result QUESTION How do I RESIZE a UIImage pulled from the Camera WITHOUT.. CGImageRef ref CGBitmapContextCreateImage bitmap UIImage newImage UIImage imageWithCGImage ref CGContextRelease bitmap CGImageRelease ref return newImage This will resize your image and rotate it to the correct orientation...
http://stackoverflow.com/questions/1298867/convert-image-to-grayscale CGColorSpaceRelease colorSpace CGContextDrawImage context CGRectMake 0 0 width height image CGContextRelease context return rawData UIImage processImage UIImage pImage DebugLog @ processing image unsigned char.. context NO CGContextDrawImage context CGRectMake 0 0 m_width m_height i CGImage CGContextRelease context CGColorSpaceRelease colorSpace now convert to grayscale uint8_t m_imageData uint8_t malloc m_width.. kCGImageAlphaNoneSkipLast CGImageRef image CGBitmapContextCreateImage context CGContextRelease context CGColorSpaceRelease colorSpace UIImage resultUIImage UIImage imageWithCGImage image CGImageRelease..
How to Rotate a UIImage 90 degrees? http://stackoverflow.com/questions/1315251/how-to-rotate-a-uiimage-90-degrees CGImageRef ref CGBitmapContextCreateImage bitmap UIImage newImage UIImage imageWithCGImage ref CGContextRelease bitmap CGImageRelease ref return newImage iphone uikit uiimage core graphics rotation share improve..
Rounded UIView using CALayers - only some corners - How? http://stackoverflow.com/questions/2264083/rounded-uiview-using-calayers-only-some-corners-how context rect img.CGImage CGImageRef imageMasked CGBitmapContextCreateImage context CGContextRelease context CGColorSpaceRelease colorSpace img release return UIImage imageWithCGImage imageMasked Don't..
How do I export UIImage array as a movie? http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie 0 0 CGImageGetWidth image CGImageGetHeight image image CGColorSpaceRelease rgbColorSpace CGContextRelease context CVPixelBufferUnlockBaseAddress pxbuffer 0 return pxbuffer frameSize is a CGSize describing your..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file CGContextEndPage CGContextEndPage pdfContext We are done with our context now so we release it CGContextRelease pdfContext EDIT Here's an example on GitHub using libHaru in an iPhone project. iphone objective c..
http://stackoverflow.com/questions/4847163/round-two-corners-in-uiview and then release that bitmap context CGImageRef bitmapContext CGBitmapContextCreateImage context CGContextRelease context convert the finished resized image to a UIImage UIImage theImage UIImage imageWithCGImage bitmapContext..
iOS UIImagePickerController result image orientation after upload http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage colorSpace kCGImageAlphaPremultipliedLast kCGBitmapByteOrder32Big CGColorSpaceRelease colorSpace CGContextDrawImage context CGRectMake 0 0 width height image CGContextRelease context I then calculate the array index for the given alpha channel using the coordinates from the UIImageView. int byteIndex bytesPerRow uiViewPoint.y uiViewPoint.x..
Resizing UIimages pulled from the Camera also ROTATES the UIimage? http://stackoverflow.com/questions/1260249/resizing-uiimages-pulled-from-the-camera-also-rotates-the-uiimage CGContextDrawImage bitmap CGRectMake 0 0 width height imageRef CGImageRef ref CGBitmapContextCreateImage bitmap UIImage result UIImage imageWithCGImage ref CGContextRelease bitmap CGImageRelease ref return result QUESTION How do I RESIZE a UIImage pulled from the Camera WITHOUT rotating the pixels iphone uiimageview uiimage uiimagepickercontroller.. bitmap CGRectMake 0 0 targetWidth targetHeight imageRef CGImageRef ref CGBitmapContextCreateImage bitmap UIImage newImage UIImage imageWithCGImage ref CGContextRelease bitmap CGImageRelease ref return newImage This will resize your image and rotate it to the correct orientation. If you need the definition for radians it is static..
http://stackoverflow.com/questions/1298867/convert-image-to-grayscale colorSpace kCGImageAlphaPremultipliedLast kCGBitmapByteOrder32Big CGColorSpaceRelease colorSpace CGContextDrawImage context CGRectMake 0 0 width height image CGContextRelease context return rawData UIImage processImage UIImage pImage DebugLog @ processing image unsigned char rawData self getBytesForImage pImage NSUInteger width pImage.size.width.. context kCGInterpolationHigh CGContextSetShouldAntialias context NO CGContextDrawImage context CGRectMake 0 0 m_width m_height i CGImage CGContextRelease context CGColorSpaceRelease colorSpace now convert to grayscale uint8_t m_imageData uint8_t malloc m_width m_height for int y 0 y m_height y for int x 0 x m_width.. m_width m_height 8 m_width sizeof uint32_t colorSpace kCGBitmapByteOrder32Little kCGImageAlphaNoneSkipLast CGImageRef image CGBitmapContextCreateImage context CGContextRelease context CGColorSpaceRelease colorSpace UIImage resultUIImage UIImage imageWithCGImage image CGImageRelease image free m_imageData make sure the data will be released..
How to Rotate a UIImage 90 degrees? http://stackoverflow.com/questions/1315251/how-to-rotate-a-uiimage-90-degrees bitmap CGRectMake 0 0 targetWidth targetHeight imageRef CGImageRef ref CGBitmapContextCreateImage bitmap UIImage newImage UIImage imageWithCGImage ref CGContextRelease bitmap CGImageRelease ref return newImage iphone uikit uiimage core graphics rotation share improve this question What about something like static inline..
Rounded UIView using CALayers - only some corners - How? http://stackoverflow.com/questions/2264083/rounded-uiview-using-calayers-only-some-corners-how 50 1 CGContextClosePath context CGContextClip context CGContextDrawImage context rect img.CGImage CGImageRef imageMasked CGBitmapContextCreateImage context CGContextRelease context CGColorSpaceRelease colorSpace img release return UIImage imageWithCGImage imageMasked Don't forget that you'll need to get the QuartzCore framework in..
How do I export UIImage array as a movie? http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie context frameTransform CGContextDrawImage context CGRectMake 0 0 CGImageGetWidth image CGImageGetHeight image image CGColorSpaceRelease rgbColorSpace CGContextRelease context CVPixelBufferUnlockBaseAddress pxbuffer 0 return pxbuffer frameSize is a CGSize describing your target frame size and frameTransform is a CGAffineTransform..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file could add as many pages as we wanted using CGContextBeginPage CGContextEndPage CGContextEndPage pdfContext We are done with our context now so we release it CGContextRelease pdfContext EDIT Here's an example on GitHub using libHaru in an iPhone project. iphone objective c ipad ios pdf generation share improve this question A couple..
http://stackoverflow.com/questions/4847163/round-two-corners-in-uiview kCGPathFill Create CGImageRef of the main view bitmap content and then release that bitmap context CGImageRef bitmapContext CGBitmapContextCreateImage context CGContextRelease context convert the finished resized image to a UIImage UIImage theImage UIImage imageWithCGImage bitmapContext image is retained by the property setting above..
iOS UIImagePickerController result image orientation after upload http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage kCGBitmapByteOrder32Big CGColorSpaceRelease colorSpace CGContextDrawImage context CGRectMake 0 0 width height image CGContextRelease context I then calculate the array index for the given alpha channel using the coordinates from the UIImageView. int byteIndex..
Resizing UIimages pulled from the Camera also ROTATES the UIimage? http://stackoverflow.com/questions/1260249/resizing-uiimages-pulled-from-the-camera-also-rotates-the-uiimage 0 0 width height imageRef CGImageRef ref CGBitmapContextCreateImage bitmap UIImage result UIImage imageWithCGImage ref CGContextRelease bitmap CGImageRelease ref return result QUESTION How do I RESIZE a UIImage pulled from the Camera WITHOUT rotating the pixels.. targetHeight imageRef CGImageRef ref CGBitmapContextCreateImage bitmap UIImage newImage UIImage imageWithCGImage ref CGContextRelease bitmap CGImageRelease ref return newImage This will resize your image and rotate it to the correct orientation. If you need..
Can I edit the pixels of the UIImage's property CGImage http://stackoverflow.com/questions/1281210/can-i-edit-the-pixels-of-the-uiimages-property-cgimage m_Context rect srcImage.CGImage m_Bits unsigned char CGBitmapContextGetData mContext void postProcess CGContextRelease m_Context free m_Bits UIImage doProcess CGPoint pt just a example unsigned char ppxl m_Bits ... do something... CGImageRef..
http://stackoverflow.com/questions/1298867/convert-image-to-grayscale kCGBitmapByteOrder32Big CGColorSpaceRelease colorSpace CGContextDrawImage context CGRectMake 0 0 width height image CGContextRelease context return rawData UIImage processImage UIImage pImage DebugLog @ processing image unsigned char rawData self getBytesForImage.. CGContextSetShouldAntialias context NO CGContextDrawImage context CGRectMake 0 0 m_width m_height i CGImage CGContextRelease context CGColorSpaceRelease colorSpace now convert to grayscale uint8_t m_imageData uint8_t malloc m_width m_height for.. colorSpace kCGBitmapByteOrder32Little kCGImageAlphaNoneSkipLast CGImageRef image CGBitmapContextCreateImage context CGContextRelease context CGColorSpaceRelease colorSpace UIImage resultUIImage UIImage imageWithCGImage image CGImageRelease image free m_imageData..
How to Rotate a UIImage 90 degrees? http://stackoverflow.com/questions/1315251/how-to-rotate-a-uiimage-90-degrees targetHeight imageRef CGImageRef ref CGBitmapContextCreateImage bitmap UIImage newImage UIImage imageWithCGImage ref CGContextRelease bitmap CGImageRelease ref return newImage iphone uikit uiimage core graphics rotation share improve this question ..
How do I create/render a UIImage from a 3D transformed UIImageView? http://stackoverflow.com/questions/1949003/how-do-i-create-render-a-uiimage-from-a-3d-transformed-uiimageview kCGBitmapByteOrder32Big CGColorSpaceRelease colorSpace CGContextDrawImage context CGRectMake 0 0 width height imageRef CGContextRelease context context CGBitmapContextCreate outputData width height bitsPerComponent bytesPerRow colorSpace kCGImageAlphaPremultipliedLast.. kCGBitmapByteOrder32Big CGColorSpaceRelease colorSpace CGContextDrawImage context CGRectMake 0 0 width height imageRef CGContextRelease context for int ii 0 ii width height ii int x ii width int y ii width int indexOutput 4 x 4 width y CGPoint p self modelToScreen.. imageRef CGBitmapContextCreateImage ctx UIImage rawImage UIImage imageWithCGImage imageRef CGContextRelease ctx free inputData free outputData return rawImage CGPoint modelToScreen float x float y float xp _transform.m22 _transform.m41..
Rounded UIView using CALayers - only some corners - How? http://stackoverflow.com/questions/2264083/rounded-uiview-using-calayers-only-some-corners-how context CGContextDrawImage context rect img.CGImage CGImageRef imageMasked CGBitmapContextCreateImage context CGContextRelease context CGColorSpaceRelease colorSpace img release return UIImage imageWithCGImage imageMasked Don't forget that you'll..
http://stackoverflow.com/questions/262156/uiimage-rounded-corners release that bitmap context CGImageRef mainViewContentBitmapContext CGBitmapContextCreateImage mainViewContentContext CGContextRelease mainViewContentContext CGImageRef maskImage UIImage imageNamed @ Mask.png CGImage CGImageRef resizedImage CGImageCreateWithMask..
How do I export UIImage array as a movie? http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie context CGRectMake 0 0 CGImageGetWidth image CGImageGetHeight image image CGColorSpaceRelease rgbColorSpace CGContextRelease context CVPixelBufferUnlockBaseAddress pxbuffer 0 return pxbuffer frameSize is a CGSize describing your target frame size..
http://stackoverflow.com/questions/3841642/curve-text-on-existing-circle context totalRotation perSectionDegrees CGImageRef contextImage CGBitmapContextCreateImage context CGContextRelease context CGColorSpaceRelease colorSpace return UIImage imageWithCGImage contextImage These are the variables I use in there.. textRadius angle angleStep CGContextRestoreGState context CGImageRef contextImage CGBitmapContextCreateImage context CGContextRelease context CGColorSpaceRelease colorSpace self saveImage UIImage imageWithCGImage contextImage withName @ test.png return UIImage..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file CGContextBeginPage CGContextEndPage CGContextEndPage pdfContext We are done with our context now so we release it CGContextRelease pdfContext EDIT Here's an example on GitHub using libHaru in an iPhone project. iphone objective c ipad ios pdf generation..
Get RGB value from UIColor presets http://stackoverflow.com/questions/4700168/get-rgb-value-from-uicolor-presets CGContextSetFillColorWithColor context color CGColor CGContextFillRect context CGRectMake 0 0 1 1 CGContextRelease context CGColorSpaceRelease rgbColorSpace for int component 0 component 3 component components component resultingPixel..
http://stackoverflow.com/questions/4847163/round-two-corners-in-uiview view bitmap content and then release that bitmap context CGImageRef bitmapContext CGBitmapContextCreateImage context CGContextRelease context convert the finished resized image to a UIImage UIImage theImage UIImage imageWithCGImage bitmapContext image is..
iOS UIImagePickerController result image orientation after upload http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload
iPhone Watermark on recorded Video. http://stackoverflow.com/questions/7205820/iphone-watermark-on-recorded-video kCGBitmapByteOrder32Little kCGImageAlphaPremultipliedFirst CGImageRef newImage CGBitmapContextCreateImage newContext CGContextRelease newContext CGColorSpaceRelease colorSpace CVPixelBufferUnlockBaseAddress imageBuffer 0 CVBufferRelease imageBuffer do not..
Make Background of UIView a Gradient Without Sub Classing http://stackoverflow.com/questions/844710/make-background-of-uiview-a-gradient-without-sub-classing UIImage uiImage UIImage imageWithCGImage cgImage Release the CGImage CGImageRelease cgImage Release the bitmap context CGContextRelease bitmapContext Release the color space CGColorSpaceRelease colorSpace Create the patterned UIColor and set as background..
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