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2014/10/15 ¤U¤È 10:10:11
iphone Programming Glossary: imageheightBlur an image of specific part (rectangular, circular)? http://stackoverflow.com/questions/14107979/blur-an-image-of-specific-part-rectangular-circular withRadious CGFloat radious if radious 0.0f return image if image nil CGFloat imageWidth image.size.width CGFloat imageHeight image.size.height CGRect rect CGRectMake 0.0f 0.0f imageWidth imageHeight UIWindow window UIApplication sharedApplication.. CGFloat imageWidth image.size.width CGFloat imageHeight image.size.height CGRect rect CGRectMake 0.0f 0.0f imageWidth imageHeight UIWindow window UIApplication sharedApplication windows objectAtIndex 0 const CGFloat scale window.screen.scale UIGraphicsBeginImageContextWithOptions.. context CGContextClosePath context CGContextClip context image drawInRect CGRectMake 0.0f 0.0f imageWidth imageHeight UIImage newImage UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext return newImage return nil Method 4..
Quartz PDF API Causing Out of Memory Crashes http://stackoverflow.com/questions/3088376/quartz-pdf-api-causing-out-of-memory-crashes page CGPDFDocumentGetPage pdfRef currentPage CGRect box CGPDFPageGetBoxRect page kCGPDFMediaBox ...setting scale and imageHeight both floats... if UIGraphicsBeginImageContextWithOptions NULL UIGraphicsBeginImageContextWithOptions CGSizeMake self.view.frame.size.width.. NULL UIGraphicsBeginImageContextWithOptions CGSizeMake self.view.frame.size.width imageHeight NO 0.0 else UIGraphicsBeginImageContext CGSizeMake self.view.frame.size.width imageHeight CGContextRef context UIGraphicsGetCurrentContext.. self.view.frame.size.width imageHeight NO 0.0 else UIGraphicsBeginImageContext CGSizeMake self.view.frame.size.width imageHeight CGContextRef context UIGraphicsGetCurrentContext NSLog @ page is d context is d pdf doc is d pdf page is d currentPage context..
Iphone convert color image to 2bit image (black-white) http://stackoverflow.com/questions/4030430/iphone-convert-color-image-to-2bit-image-black-white suggests does not work for me e.g. CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceRGB unsigned char rawData malloc imageHeight imageWidth 4 CGContextRef offscreenContext CGBitmapContextCreate rawData imageWidth imageHeight bitsPerComponent bytesPerRow.. char rawData malloc imageHeight imageWidth 4 CGContextRef offscreenContext CGBitmapContextCreate rawData imageWidth imageHeight bitsPerComponent bytesPerRow colorSpace kCGImageAlphaPremultipliedLast kCGBitmapByteOrderDefault CGColorSpaceRelease..
Drawing waveform with AVAssetReader http://stackoverflow.com/questions/5032775/drawing-waveform-with-avassetreader samples normalizeMax SInt16 normalizeMax sampleCount NSInteger sampleCount channelCount NSInteger channelCount imageHeight float imageHeight CGSize imageSize CGSizeMake sampleCount imageHeight UIGraphicsBeginImageContext imageSize CGContextRef.. SInt16 normalizeMax sampleCount NSInteger sampleCount channelCount NSInteger channelCount imageHeight float imageHeight CGSize imageSize CGSizeMake sampleCount imageHeight UIGraphicsBeginImageContext imageSize CGContextRef context UIGraphicsGetCurrentContext.. channelCount NSInteger channelCount imageHeight float imageHeight CGSize imageSize CGSizeMake sampleCount imageHeight UIGraphicsBeginImageContext imageSize CGContextRef context UIGraphicsGetCurrentContext CGContextSetFillColorWithColor context..
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