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| Original file line number | Diff line number | Diff line change |
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| // | ||
| // Copyright (c) SRG SSR. All rights reserved. | ||
| // | ||
| // License information is available from the LICENSE file. | ||
| // | ||
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| #import <UIKit/UIKit.h> | ||
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| NS_ASSUME_NONNULL_BEGIN | ||
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| @interface UIImage (SRGAppearance) | ||
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| /** | ||
| * Return an image generated from the vector image at the specified path. | ||
| * | ||
| * @param filePath The path of the vector image to use. | ||
| * @param size The size of the image to create. | ||
| * | ||
| * @return The generated image, `nil` if generation failed. | ||
| */ | ||
| + (nullable UIImage *)srg_vectorImageAtPath:(NSString *)filePath withSize:(CGSize)size; | ||
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| /** | ||
| * Return the file URL of an image generated from the vector image at the specified path. | ||
| * | ||
| * @param filePath The path of the vector image to use. | ||
| * @param size The size of the image to create. | ||
| * | ||
| * @return The generated image, `nil` if generation failed. | ||
| * | ||
| * @discussion Images are stored in the `/Library/Caches` directory. | ||
| */ | ||
| + (nullable NSURL *)srg_URLForVectorImageAtPath:(NSString *)filePath withSize:(CGSize)size; | ||
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| /** | ||
| * Clears the vector image cache. | ||
| */ | ||
| + (void)srg_clearVectorImageCache; | ||
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| /** | ||
| * Return the receiver, tinted with the specified color (if the color is `nil`, the image is returned as is). | ||
| */ | ||
| - (UIImage *)srg_imageTintedWithColor:(nullable UIColor *)color; | ||
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| @end | ||
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| NS_ASSUME_NONNULL_END |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,155 @@ | ||
| // | ||
| // Copyright (c) SRG SSR. All rights reserved. | ||
| // | ||
| // License information is available from the LICENSE file. | ||
| // | ||
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| #import "UIImage+SRGAppearance.h" | ||
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| static CGFloat SRGAppearanceImageAspectScaleFit(CGSize sourceSize, CGRect destRect) | ||
| { | ||
| CGSize destSize = destRect.size; | ||
| CGFloat scaleW = destSize.width / sourceSize.width; | ||
| CGFloat scaleH = destSize.height / sourceSize.height; | ||
| return fmin(scaleW, scaleH); | ||
| } | ||
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| static CGRect SRGAppearanceImageRectAroundCenter(CGPoint center, CGSize size) | ||
| { | ||
| return CGRectMake(center.x - size.width / 2.f, center.y - size.height / 2.f, size.width, size.height); | ||
| } | ||
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| static CGRect SRGAppearanceImageRectByFittingRect(CGRect sourceRect, CGRect destinationRect) | ||
| { | ||
| CGFloat aspect = SRGAppearanceImageAspectScaleFit(sourceRect.size, destinationRect); | ||
| CGSize targetSize = CGSizeMake(sourceRect.size.width * aspect, sourceRect.size.height * aspect); | ||
| CGPoint center = CGPointMake(CGRectGetMidX(destinationRect), CGRectGetMidY(destinationRect)); | ||
| return SRGAppearanceImageRectAroundCenter(center, targetSize); | ||
| } | ||
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| static void SRGAppearanceImageDrawPDFPageInRect(CGPDFPageRef pageRef, CGRect rect) | ||
| { | ||
| CGContextRef context = UIGraphicsGetCurrentContext(); | ||
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| CGContextSaveGState(context); | ||
| UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); | ||
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| // Flip the context to Quartz space | ||
| CGAffineTransform transform = CGAffineTransformIdentity; | ||
| transform = CGAffineTransformScale(transform, 1.f, -1.f); | ||
| transform = CGAffineTransformTranslate(transform, 0.f, -image.size.height); | ||
| CGContextConcatCTM(context, transform); | ||
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| // Flip the rect, which remains in UIKit space | ||
| CGRect d = CGRectApplyAffineTransform(rect, transform); | ||
|
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| // Calculate a rectangle to draw to | ||
| CGRect pageRect = CGPDFPageGetBoxRect(pageRef, kCGPDFCropBox); | ||
| CGFloat drawingAspect = SRGAppearanceImageAspectScaleFit(pageRect.size, d); | ||
| CGRect drawingRect = SRGAppearanceImageRectByFittingRect(pageRect, d); | ||
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| // Adjust the context | ||
| CGContextTranslateCTM(context, drawingRect.origin.x, drawingRect.origin.y); | ||
| CGContextScaleCTM(context, drawingAspect, drawingAspect); | ||
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| // Draw the page | ||
| CGContextDrawPDFPage(context, pageRef); | ||
| CGContextRestoreGState(context); | ||
| } | ||
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| static NSString *SRGAppearanceVectorImageCachesDirectory(void) | ||
| { | ||
| static dispatch_once_t s_onceToken; | ||
| static NSString *s_imageCachesDirectory; | ||
| dispatch_once(&s_onceToken, ^{ | ||
| NSString *cachesDirectory = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).firstObject; | ||
| s_imageCachesDirectory = [cachesDirectory stringByAppendingPathComponent:@"SRGAppearance/VectorImages"]; | ||
| }); | ||
| return s_imageCachesDirectory; | ||
| } | ||
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| @implementation UIImage (SRGAppearance) | ||
|
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| // Implementation borrowed from https://github.com/erica/useful-things | ||
| + (UIImage *)srg_vectorImageAtPath:(NSString *)filePath withSize:(CGSize)size | ||
| { | ||
| NSURL *fileURL = [self srg_URLForVectorImageAtPath:filePath withSize:size]; | ||
| return fileURL ? [UIImage imageWithContentsOfFile:fileURL.path] : nil; | ||
| } | ||
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| + (NSURL *)srg_URLForVectorImageAtPath:(NSString *)filePath withSize:(CGSize)size | ||
| { | ||
| // Check cached image existence at the very beginning, and return it if available | ||
| NSString *cachedFileName = [NSString stringWithFormat:@"%@_%@_%@.png", @(filePath.hash), @(size.width), @(size.height)]; | ||
| NSString *cachesDirectory = SRGAppearanceVectorImageCachesDirectory(); | ||
| NSString *cachedFilePath = [cachesDirectory stringByAppendingPathComponent:cachedFileName]; | ||
| if ([[NSFileManager defaultManager] fileExistsAtPath:cachedFilePath]) { | ||
| return [NSURL fileURLWithPath:cachedFilePath]; | ||
| } | ||
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| // Check cache directory existence, since the cache might be cleared anytime | ||
| if (! [[NSFileManager defaultManager] fileExistsAtPath:cachesDirectory]) { | ||
| if (! [[NSFileManager defaultManager] createDirectoryAtPath:cachesDirectory withIntermediateDirectories:YES attributes:nil error:NULL]) { | ||
| return nil; | ||
| } | ||
| } | ||
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| NSURL *fileURL = [NSURL fileURLWithPath:filePath]; | ||
| CGPDFDocumentRef pdfDocumentRef = CGPDFDocumentCreateWithURL((__bridge CFURLRef)fileURL); | ||
| if (! pdfDocumentRef) { | ||
| return nil; | ||
| } | ||
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| UIGraphicsBeginImageContextWithOptions(size, NO, 1. /* Force scale to 1 (0 would use device scale) */); | ||
| CGPDFPageRef pageRef = CGPDFDocumentGetPage(pdfDocumentRef, 1); | ||
| SRGAppearanceImageDrawPDFPageInRect(pageRef, CGRectMake(0.f, 0.f, size.width, size.height)); | ||
| UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); | ||
| UIGraphicsEndImageContext(); | ||
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| CGPDFDocumentRelease(pdfDocumentRef); | ||
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| NSData *imageData = UIImagePNGRepresentation(image); | ||
| if (! imageData) { | ||
| return nil; | ||
| } | ||
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| if (! [[NSFileManager defaultManager] createFileAtPath:cachedFilePath contents:imageData attributes:nil]) { | ||
| return nil; | ||
| } | ||
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| return [NSURL fileURLWithPath:cachedFilePath]; | ||
| } | ||
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| + (void)srg_clearVectorImageCache | ||
| { | ||
| NSString *cachesDirectory = SRGAppearanceVectorImageCachesDirectory(); | ||
| if ([[NSFileManager defaultManager] fileExistsAtPath:cachesDirectory]) { | ||
| [[NSFileManager defaultManager] removeItemAtPath:cachesDirectory error:NULL]; | ||
| } | ||
| } | ||
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| - (UIImage *)srg_imageTintedWithColor:(UIColor *)color | ||
| { | ||
| if (! color) { | ||
| return self; | ||
| } | ||
|
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| CGRect rect = CGRectMake(0.f, 0.f, self.size.width, self.size.height); | ||
| UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.f); | ||
| CGContextRef context = UIGraphicsGetCurrentContext(); | ||
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| CGContextTranslateCTM(context, 0.f, self.size.height); | ||
| CGContextScaleCTM(context, 1.0f, -1.0f); | ||
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| CGContextDrawImage(context, rect, self.CGImage); | ||
| CGContextSetBlendMode(context, kCGBlendModeSourceIn); | ||
| CGContextSetFillColorWithColor(context, color.CGColor); | ||
| CGContextFillRect(context, rect); | ||
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| UIImage *tintedImage = UIGraphicsGetImageFromCurrentImageContext(); | ||
| UIGraphicsEndImageContext(); | ||
|
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| return tintedImage; | ||
| } | ||
|
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| @end |
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