2014/10/15 下午 10:05:01

iphone Programming Glossary: cgcontextsetinterpolationquality

http://stackoverflow.com/questions/1298867/convert-image-to-grayscale

rgbImage m_width m_height 8 m_width 4 colorSpace kCGBitmapByteOrder32Little kCGImageAlphaNoneSkipLast CGContextSetInterpolationQuality context kCGInterpolationHigh CGContextSetShouldAntialias context NO CGContextDrawImage context CGRectMake 0 0 m_width m_height..

iPhone: Changing CGImageAlphaInfo of CGImage

http://stackoverflow.com/questions/2457116/iphone-changing-cgimagealphainfo-of-cgimage

8 4 self.size.width genericColorSpace kCGImageAlphaPremultipliedFirst CGColorSpaceRelease genericColorSpace CGContextSetInterpolationQuality thumbBitmapCtxt kCGInterpolationDefault CGRect destRect CGRectMake 0 0 self.size.width self.size.height CGContextDrawImage..

CGContextDrawPDFPage taking up large amounts of memory

http://stackoverflow.com/questions/2975240/cgcontextdrawpdfpage-taking-up-large-amounts-of-memory

take up huge amounts of memory iphone cocoa touch pdf core graphics share improve this question Try to add CGContextSetInterpolationQuality g kCGInterpolationHigh CGContextSetRenderingIntent g kCGRenderingIntentDefault before CGContextDrawPDFPage g m_page I had..

Load image from photo library

http://stackoverflow.com/questions/3333652/load-image-from-photo-library

nil originalImage.size.width originalImage.size.height 8 originalImage.size.width colorSapce kCGImageAlphaNone CGContextSetInterpolationQuality context kCGInterpolationHigh CGContextSetShouldAntialias context NO CGContextDrawImage context CGRectMake 0 0 originalImage.size.width..

iphone - Scaling Images are very slow - Help

http://stackoverflow.com/questions/3842042/iphone-scaling-images-are-very-slow-help

someone point out how to improve it thanks iphone uiimage scale share improve this question You could try either CGContextSetInterpolationQuality context kCGInterpolationNone or CGContextSetInterpolationQuality context kCGInterpolationLow and see if either of those.. share improve this question You could try either CGContextSetInterpolationQuality context kCGInterpolationNone or CGContextSetInterpolationQuality context kCGInterpolationLow and see if either of those produce any performance differences with an acceptable quality level...

Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints?

http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints

that images will render faster than a CGPDFPageRef Use NSOperations or GCD Blocks to prepare pages ahead of time. call CGContextSetInterpolationQuality ctx kCGInterpolationHigh CGContextSetRenderingIntent ctx kCGRenderingIntentDefault before CGContextDrawPDFPage to reduce..

CGContextDrawImage very slow on iPhone 4

http://stackoverflow.com/questions/3915490/cgcontextdrawimage-very-slow-on-iphone-4

can I do for better performance on iPhone 4 Any suggestions iphone bitmap share improve this question Try setting CGContextSetInterpolationQuality myBitmapContext kCGInterpolationNone on your bitmap. kCGInterpolationLow is another option. Another technique that may help..

how to fit pdf page in entire view

http://stackoverflow.com/questions/4321681/how-to-fit-pdf-page-in-entire-view

kCGPDFCropBox layer.bounds 0 true CGContextConcatCTM ctx CGAffineTransformMakeScale scaleToApply scaleToApply CGContextSetInterpolationQuality ctx kCGInterpolationHigh CGContextSetRenderingIntent ctx kCGRenderingIntentDefault CGContextDrawPDFPage ctx myPageRef CGContextRestoreGState..

problem with rendering pdf on the entire screen of pdf

http://stackoverflow.com/questions/4634331/problem-with-rendering-pdf-on-the-entire-screen-of-pdf

scaleToApply CGContextConcatCTM ctx CGPDFPageGetDrawingTransform myPageRef kCGPDFCropBox layer.bounds 0 true CGContextSetInterpolationQuality ctx kCGInterpolationHigh CGContextSetRenderingIntent ctx kCGRenderingIntentDefault CGContextDrawPDFPage ctx myPageRef I..

Display PDF on iPad

http://stackoverflow.com/questions/4722526/display-pdf-on-ipad

iPhone CGContextRef CGBitmapContextCreate unsupported parameter combination

http://stackoverflow.com/questions/5545600/iphone-cgcontextref-cgbitmapcontextcreate-unsupported-parameter-combination

imageRef CGImageGetBitmapInfo imageRef if bitmap nil return nil CGContextConcatCTM bitmap transform CGContextSetInterpolationQuality bitmap quality CGContextDrawImage bitmap transpose transposedRect newRect imageRef CGImageRef newImageRef CGBitmapContextCreateImage..

Rotate image in UIImageView

http://stackoverflow.com/questions/7191492/rotate-image-in-uiimageview

kCGImageAlphaPremultipliedFirst CGContextSetAllowsAntialiasing bmContext YES CGContextSetShouldAntialias bmContext YES CGContextSetInterpolationQuality bmContext kCGInterpolationHigh CGColorSpaceRelease colorSpace CGContextTranslateCTM bmContext rotatedRect.size.width 2..

How to crop the image in iPhone

http://stackoverflow.com/questions/7950719/how-to-crop-the-image-in-iphone

rgbImage m_wint m_hint 8 m_wint sizeof uint32_t colorSpace kCGBitmapByteOrder32Little kCGImageAlphaNoneSkipLast CGContextSetInterpolationQuality context kCGInterpolationHigh CGContextSetShouldAntialias context NO CGContextTranslateCTM context 0 m_hint CGContextScaleCTM..

PDF to image creation in ios

http://stackoverflow.com/questions/8652472/pdf-to-image-creation-in-ios

page kCGPDFMediaBox aRect 0 true And apply the transform. CGContextConcatCTM context pdfTransform CGContextSetInterpolationQuality context kCGInterpolationHigh CGContextSetRenderingIntent context kCGRenderingIntentDefault CGContextDrawPDFPage context..