2014/10/15 下午 10:10:12

iphone Programming Glossary: imagescale

How to get a rotated, zoomed and panned image from an UIImageView at its full resolution?

http://stackoverflow.com/questions/11104042/how-to-get-a-rotated-zoomed-and-panned-image-from-an-uiimageview-at-its-full-re

and that the frame of faceImageView is set to the enclosingView's bounds. UIImage captureView float imageScale sqrtf powf faceImageView.transform.a 2.f powf faceImageView.transform.c 2.f CGFloat widthScale faceImageView.bounds.size.width.. faceImageView.image.size.height float contentScale MIN widthScale heightScale float effectiveScale imageScale contentScale CGSize captureSize CGSizeMake enclosingView.bounds.size.width effectiveScale enclosingView.bounds.size.height..

iPhone - How do you color an image?

http://stackoverflow.com/questions/1223340/iphone-how-do-you-color-an-image

CGRect rect CGRectMake 0.0f 0.0f self.size.width self.size.height if UIGraphicsBeginImageContextWithOptions CGFloat imageScale 1.0f if self respondsToSelector @selector scale The scale property is new with iOS4. imageScale self.scale UIGraphicsBeginImageContextWithOptions.. CGFloat imageScale 1.0f if self respondsToSelector @selector scale The scale property is new with iOS4. imageScale self.scale UIGraphicsBeginImageContextWithOptions self.size NO imageScale else UIGraphicsBeginImageContext self.size self.. scale The scale property is new with iOS4. imageScale self.scale UIGraphicsBeginImageContextWithOptions self.size NO imageScale else UIGraphicsBeginImageContext self.size self drawInRect rect CGContextRef context UIGraphicsGetCurrentContext CGContextSetBlendMode..

Drawing into CGImageRef

http://stackoverflow.com/questions/4257043/drawing-into-cgimageref

rintf UIScreen mainScreen currentMode size .width UIScreen mainScreen bounds .size.width 1 CGImageRef blerg CGFloat imageScale CGFloat 1.0 CGFloat width CGFloat 180.0 CGFloat height CGFloat 180.0 if HIRESDEVICE imageScale CGFloat 2.0 Create a bitmap.. blerg CGFloat imageScale CGFloat 1.0 CGFloat width CGFloat 180.0 CGFloat height CGFloat 180.0 if HIRESDEVICE imageScale CGFloat 2.0 Create a bitmap graphics context of the given size CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceRGB CGContextRef.. size CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceRGB CGContextRef context CGBitmapContextCreate NULL width imageScale height imageScale 8 0 colorSpace kCGImageAlphaPremultipliedLast Draw ... CGContextSetRGBFillColor context CGFloat 0.0 CGFloat..