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52 lines
1.4 KiB
Objective-C
52 lines
1.4 KiB
Objective-C
#import "MWMImageCoder.h"
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@implementation MWMImageCoder
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- (UIImage *)imageWithData:(NSData *)data {
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UIImage *image = [UIImage imageWithData:data];
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if (!image) {
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return nil;
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}
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CGImageRef cgImage = image.CGImage;
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size_t width = CGImageGetWidth(cgImage);
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size_t height = CGImageGetHeight(cgImage);
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int32_t flags;
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if ([self imageHasAlpha:image]) {
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flags = kCGImageAlphaPremultipliedLast;
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} else {
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flags = kCGImageAlphaNoneSkipLast;
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}
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CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
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CGContextRef context = CGBitmapContextCreate(NULL, width, height, 8, width * 4, colorSpace, flags);
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CGColorSpaceRelease(colorSpace);
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CGContextDrawImage(context, CGRectMake(0, 0, width, height), cgImage);
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CGImageRef resultCgImage = CGBitmapContextCreateImage(context);
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UIImage *resultImage = [UIImage imageWithCGImage:resultCgImage];
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CGImageRelease(resultCgImage);
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CGContextRelease(context);
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return resultImage;
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}
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- (NSData *)dataFromImage:(UIImage *)image {
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if ([self imageHasAlpha:image]) {
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return UIImagePNGRepresentation(image);
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} else {
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return UIImageJPEGRepresentation(image, 0.9);
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}
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}
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- (BOOL)imageHasAlpha:(UIImage *)image {
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CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(image.CGImage);
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return (alphaInfo == kCGImageAlphaPremultipliedLast ||
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alphaInfo == kCGImageAlphaPremultipliedFirst ||
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alphaInfo == kCGImageAlphaLast ||
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alphaInfo == kCGImageAlphaFirst);
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}
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@end
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