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| Original file line number | Diff line number | Diff line change |
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| #import "FTMaskRenderer.h" | ||
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| @interface FTImageMaskRenderer : FTMaskRenderer | ||
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| @property (readonly, nonatomic) UIImage *sourceImage; | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
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| #import "FTImageMaskRenderer.h" | ||
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| @implementation FTImageMaskRenderer | ||
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| @synthesize sourceImage = _sourceImage; | ||
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| - (UIImage *)sourceImage; | ||
| { | ||
| if (!_sourceImage) { | ||
| _sourceImage = [[UIImage alloc] initWithContentsOfFile:self.URL.path]; | ||
| } | ||
| return _sourceImage; | ||
| } | ||
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| - (CGSize)targetSize; | ||
| { | ||
| return self.sourceImage.size; | ||
| } | ||
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| - (UIImage *)imageWithCacheIdentifier:(NSString *)identifier; | ||
| { | ||
| if (self.sourceImage == nil) { | ||
| [NSException raise:@"FTPDFIconRendererCacheError" | ||
| format:@"Can’t render an image without a source image."]; | ||
| } | ||
| return [super imageWithCacheIdentifier:identifier]; | ||
| } | ||
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| - (void)drawImageInContext:(CGContextRef)context; | ||
| { | ||
| UIImage *source = self.sourceImage; | ||
| CGRect rect = CGRectMake(0, 0, source.size.width, source.size.height); | ||
| CGContextClipToMask(context, rect, [source CGImage]); | ||
| } | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
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| #import <UIKit/UIKit.h> | ||
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| @interface FTMaskRenderer : NSObject | ||
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| @property (readonly, nonatomic) NSURL *URL; | ||
| @property (assign, nonatomic) UIColor *targetColor; | ||
| @property (assign, nonatomic) BOOL cache; | ||
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| + (NSString *)cacheDirectory; | ||
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| - (id)initWithURL:(NSURL *)URL; | ||
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| - (CGSize)targetSize; | ||
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| // When caching is enabled and the image is used as a mask then an identifier | ||
| // *has* to be specified. | ||
| // | ||
| // For example, when generating button icons, you could use an identifier like | ||
| // `normal` or `highlighted`, depending on the state. | ||
| - (UIImage *)image; | ||
| - (UIImage *)imageWithCacheIdentifier:(NSString *)identifier; | ||
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| // PRIVATE | ||
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| - (void)drawImageInContext:(CGContextRef)context; | ||
| - (void)drawTargetColorInContext:(CGContextRef)context; | ||
| - (void)canCacheWithIdentifier:(NSString *)identifier; | ||
| - (NSString *)cacheRawFilenameWithIdentifier:(NSString *)identifier; | ||
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| @end |
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| #import "FTMaskRenderer.h" | ||
| #import "TargetConditionals.h" | ||
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| // From: https://gist.github.com/1209911 | ||
| #import <CommonCrypto/CommonDigest.h> | ||
| static NSString * | ||
| FTPDFMD5String(NSString *input) { | ||
| const char *cStr = [input UTF8String]; | ||
| unsigned char result[16]; | ||
| CC_MD5(cStr, strlen(cStr), result); | ||
| return [NSString stringWithFormat:@"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", | ||
| result[0], result[1], result[2], result[3], | ||
| result[4], result[5], result[6], result[7], | ||
| result[8], result[9], result[10], result[11], | ||
| result[12], result[13], result[14], result[15]]; | ||
| } | ||
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| @interface FTMaskRenderer () | ||
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| - (NSString *)cachePathWithIdentifier:(NSString *)identifier; | ||
| - (UIImage *)cachedImageAtPath:(NSString *)cachePath; | ||
| @end | ||
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| @implementation FTMaskRenderer | ||
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| - (id)initWithURL:(NSURL *)URL; | ||
| { | ||
| if ((self = [super init])) { | ||
| _URL = URL; | ||
| _cache = YES; | ||
| } | ||
| return self; | ||
| } | ||
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| - (CGSize)targetSize; | ||
| { | ||
| [NSException raise:@"AbstractClassError" | ||
| format:@"This class is supposed to be subclassed."]; | ||
| return CGSizeZero; | ||
| } | ||
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| #pragma mark - drawing | ||
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| - (UIImage *)image; | ||
| { | ||
| return [self imageWithCacheIdentifier:nil]; | ||
| } | ||
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| - (UIImage *)imageWithCacheIdentifier:(NSString *)identifier; | ||
| { | ||
| if (self.cache) [self canCacheWithIdentifier:identifier]; | ||
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| UIImage *image = nil; | ||
| NSString *cachePath = nil; | ||
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| if (self.cache) { | ||
| cachePath = [self cachePathWithIdentifier:identifier]; | ||
| image = [self cachedImageAtPath:cachePath]; | ||
| if (image) return image; | ||
| } | ||
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| // Setup context for target size and with main screen scale factor. | ||
| CGSize targetSize = self.targetSize; | ||
| UIGraphicsBeginImageContextWithOptions(targetSize, false, 0); | ||
| CGContextRef context = UIGraphicsGetCurrentContext(); | ||
| // Flip context, making bottom-left the origin. | ||
| CGContextConcatCTM(context, CGAffineTransformMake(1, 0, 0, -1, 0, targetSize.height)); | ||
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| [self drawImageInContext:context]; | ||
| [self drawTargetColorInContext:context]; | ||
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| image = UIGraphicsGetImageFromCurrentImageContext(); | ||
| UIGraphicsEndImageContext(); | ||
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| if (self.cache) { | ||
| dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{ | ||
| [UIImagePNGRepresentation(image) writeToFile:cachePath atomically:NO]; | ||
| }); | ||
| } | ||
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| return image; | ||
| } | ||
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| - (void)drawImageInContext:(CGContextRef)context; | ||
| { | ||
| [NSException raise:@"AbstractClassError" | ||
| format:@"This class is supposed to be subclassed."]; | ||
| } | ||
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| - (void)drawTargetColorInContext:(CGContextRef)context; | ||
| { | ||
| CGContextSetFillColorWithColor(context, self.targetColor.CGColor); | ||
| CGContextSetBlendMode(context, kCGBlendModeSourceAtop); | ||
| CGSize targetSize = self.targetSize; | ||
| CGContextFillRect(context, CGRectMake(0, 0, targetSize.width, targetSize.height)); | ||
| } | ||
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| #pragma mark - caching | ||
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| + (NSString *)cacheDirectory; | ||
| { | ||
| static NSString *cacheDirectory; | ||
| static dispatch_once_t onceToken; | ||
| dispatch_once(&onceToken, ^{ | ||
| cacheDirectory = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0]; | ||
| cacheDirectory = [cacheDirectory stringByAppendingPathComponent:@"__FTPDFIconRenderer_CACHE__"]; | ||
| [[NSFileManager new] createDirectoryAtPath:cacheDirectory | ||
| withIntermediateDirectories:YES | ||
| attributes:nil | ||
| error:NULL]; | ||
| }); | ||
| return cacheDirectory; | ||
| } | ||
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| - (void)canCacheWithIdentifier:(NSString *)identifier; | ||
| { | ||
| if (identifier == nil) { | ||
| [NSException raise:@"FTPDFIconRendererCacheError" | ||
| format:@"A masked result can’t be cached without a cache identifier."]; | ||
| } else if (self.targetColor == nil) { | ||
| [NSException raise:@"FTPDFIconRendererCacheError" | ||
| format:@"Can’t produce an image from a mask without a target color."]; | ||
| } | ||
| } | ||
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| - (UIImage *)cachedImageAtPath:(NSString *)cachePath; | ||
| { | ||
| UIImage *image = nil; | ||
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| NSData *data = [NSData dataWithContentsOfFile:cachePath]; | ||
| if (data) { | ||
| CGDataProviderRef provider = CGDataProviderCreateWithCFData((__bridge CFDataRef)data); | ||
| CGImageRef imageRef = CGImageCreateWithPNGDataProvider(provider, NULL, NO, kCGRenderingIntentDefault); | ||
| CGDataProviderRelease(provider); | ||
| image = [UIImage imageWithCGImage:imageRef | ||
| scale:[[UIScreen mainScreen] scale] | ||
| orientation:UIImageOrientationUp]; | ||
| CGImageRelease(imageRef); | ||
| } | ||
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| return image; | ||
| } | ||
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| - (NSString *)cacheRawFilenameWithIdentifier:(NSString *)identifier; | ||
| { | ||
| NSDictionary *attributes = [[NSFileManager new] attributesOfItemAtPath:self.URL.path | ||
| error:NULL]; | ||
| NSString *filename = [NSString stringWithFormat:@"%@-%@-%@-%@-%@", | ||
| [self.URL lastPathComponent], | ||
| attributes[NSFileSize], | ||
| attributes[NSFileModificationDate], | ||
| NSStringFromCGSize(self.targetSize), | ||
| identifier ?: @""]; | ||
| return filename; | ||
| } | ||
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| - (NSString *)cachePathWithIdentifier:(NSString *)identifier; | ||
| { | ||
| NSString *cachePath = [self cacheRawFilenameWithIdentifier:identifier]; | ||
| #if TARGET_IPHONE_SIMULATOR | ||
| // On the simulator, the cache dir is shared between retina and non-retina | ||
| // devices, so include the device's main screen scale factor to ensure the | ||
| // right dimensions are used per device. | ||
| cachePath = [NSString stringWithFormat:@"%@-%f", cachePath, [[UIScreen mainScreen] scale]]; | ||
| #endif | ||
| cachePath = FTPDFMD5String(cachePath); | ||
| cachePath = [[[self class] cacheDirectory] stringByAppendingPathComponent:cachePath]; | ||
| cachePath = [cachePath stringByAppendingPathExtension:@"png"]; | ||
| return cachePath; | ||
| } | ||
|
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| @end |
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