/gist:2465637
Created Apr 22, 2012
CTUIImage+Extensions
| // | |
| // CTUIImage+Extensions.h | |
| // MineSweeper | |
| // | |
| // Created by Chad Weider on 3/29/12. | |
| // Copyright (c) 2012 Chad Weider. All rights reserved. | |
| // | |
| #import <UIKit/UIKit.h> | |
| @interface UIImage (CTUIImageExtensions) | |
| + (UIImage *)ct_imageWithPDFNamed:(NSString *)name size:(CGSize)size; | |
| - (UIImage *)ct_imageWithShadowOffset:(CGSize)offset blur:(CGFloat)blur color:(UIColor *)color; | |
| - (UIImage *)ct_imageWithOverlayColor:(UIColor *)color; | |
| - (UIImage *)ct_imageWithInnerShadowOffset:(CGSize)offset color:(UIColor *)color; | |
| @end | |
| // | |
| // CTUIImage+Extensions.m | |
| // MineSweeper | |
| // | |
| // Created by Chad Weider on 3/29/12. | |
| // Copyright (c) 2012 Chad Weider. All rights reserved. | |
| // | |
| #import "CTUIImage+Extensions.h" | |
| @implementation UIImage (CTUIImageExtensions) | |
| + (UIImage *)ct_imageWithPDFNamed:(NSString *)name size:(CGSize)size | |
| { | |
| CGFloat scale = 1; | |
| CGColorSpaceRef colorspace = NULL; | |
| CGContextRef layerContext = NULL; | |
| void *layerBytes = NULL; | |
| CGPDFDocumentRef iconDocument = NULL; | |
| CGImageRef cg_image = NULL; | |
| UIImage *image = nil; | |
| if ([UIScreen instancesRespondToSelector:@selector(scale)]) | |
| { | |
| scale = [[UIScreen mainScreen] scale]; | |
| } | |
| if ([UIImage respondsToSelector:@selector(imageWithCGImage:scale:orientation:)]) | |
| { | |
| size = CGSizeMake(size.width * scale, size.height * scale); | |
| } | |
| else | |
| { | |
| scale = 1; | |
| } | |
| /* Setup */ | |
| colorspace = CGColorSpaceCreateDeviceRGB(); | |
| CGRect layerRect = CGRectMake(0, 0, size.width, size.height); | |
| layerBytes = calloc(size.width * size.height, 4); | |
| if (!layerBytes) | |
| goto END_RENDER; | |
| layerContext = CGBitmapContextCreate( | |
| layerBytes, | |
| size.width, | |
| size.height, | |
| 8, | |
| 4 * size.width, | |
| colorspace, | |
| kCGImageAlphaPremultipliedLast); | |
| if (!layerContext) | |
| goto END_RENDER; | |
| CFStringRef iconPath = (CFStringRef)[[NSBundle mainBundle] pathForResource:name ofType:@"pdf"]; | |
| if (!iconPath) | |
| goto END_RENDER; | |
| CFURLRef iconURL = CFURLCreateWithFileSystemPath(NULL, iconPath, kCFURLPOSIXPathStyle, false); | |
| iconDocument = CGPDFDocumentCreateWithURL(iconURL); | |
| CFRelease(iconURL); | |
| if (!iconDocument) | |
| goto END_RENDER; | |
| CGPDFPageRef iconPage = CGPDFDocumentGetPage(iconDocument, 1); | |
| /* Draw */ | |
| CGRect iconRect = CGPDFPageGetBoxRect(iconPage, kCGPDFCropBox); | |
| CGAffineTransform iconTransform = CGPDFPageGetDrawingTransform(iconPage, kCGPDFCropBox, iconRect, 0, true); | |
| CGFloat scaleFactor = MIN(layerRect.size.width/iconRect.size.width, layerRect.size.height/iconRect.size.width); | |
| iconTransform = CGAffineTransformTranslate(iconTransform, CGRectGetWidth(layerRect)/2., CGRectGetHeight(layerRect)/2.); | |
| iconTransform = CGAffineTransformScale(iconTransform, scaleFactor, scaleFactor); | |
| iconTransform = CGAffineTransformTranslate(iconTransform, -CGRectGetMinX(iconRect)-CGRectGetWidth(iconRect)/2., -CGRectGetMinY(iconRect)-CGRectGetHeight(iconRect)/2.); | |
| CGContextConcatCTM(layerContext, iconTransform); | |
| CGContextDrawPDFPage(layerContext, iconPage); | |
| /* Render */ | |
| cg_image = CGBitmapContextCreateImage(layerContext); | |
| if (!cg_image) | |
| goto END_RENDER; | |
| if ([UIImage respondsToSelector:@selector(imageWithCGImage:scale:orientation:)]) | |
| { | |
| image = [UIImage imageWithCGImage:cg_image scale:scale orientation:UIImageOrientationUp]; | |
| } | |
| else | |
| { | |
| image = [UIImage imageWithCGImage:cg_image]; | |
| } | |
| END_RENDER: | |
| if (cg_image != NULL) | |
| CGImageRelease(cg_image); | |
| if (iconDocument != NULL) | |
| CGPDFDocumentRelease(iconDocument); | |
| if (layerContext != NULL) | |
| CGContextRelease(layerContext); | |
| if (layerBytes != NULL) | |
| free(layerBytes); | |
| if (colorspace != NULL) | |
| CGColorSpaceRelease(colorspace); | |
| return image; | |
| } | |
| - (UIImage *)ct_imageWithShadowOffset:(CGSize)offset blur:(CGFloat)blur color:(UIColor *)color | |
| { | |
| CGColorSpaceRef colorspace = NULL; | |
| CGContextRef layerContext = NULL; | |
| void *layerBytes = NULL; | |
| CGImageRef cg_image = NULL; | |
| UIImage *image = nil; | |
| CGFloat scale = [self respondsToSelector:@selector(scale)] ? [self scale] : 1; | |
| CGSize size = [self size]; | |
| if ([UIImage respondsToSelector:@selector(imageWithCGImage:scale:orientation:)]) | |
| { | |
| size = CGSizeMake(size.width * scale, size.height * scale); | |
| offset = CGSizeMake(offset.width * scale, offset.height * scale); | |
| blur = blur * scale; | |
| } | |
| else | |
| { | |
| scale = 1; | |
| } | |
| blur = MAX(blur, 0); | |
| offset = CGSizeMake(offset.width, -offset.height); | |
| /* Setup */ | |
| colorspace = CGColorSpaceCreateDeviceRGB(); | |
| CGRect layerRect = CGRectMake(ceilf(blur+fabs(offset.width)), ceilf(blur+fabs(offset.height)), size.width, size.height); | |
| size = CGSizeMake(size.width+ceilf(blur+fabsf(offset.width))*2, size.height+ceilf(+blur+fabsf(offset.height))*2); | |
| layerBytes = calloc(size.width * size.height, 4); | |
| if (!layerBytes) | |
| goto END_RENDER; | |
| layerContext = CGBitmapContextCreate( | |
| layerBytes, | |
| size.width, | |
| size.height, | |
| 8, | |
| 4 * size.width, | |
| colorspace, | |
| kCGImageAlphaPremultipliedLast); | |
| if (!layerContext) | |
| goto END_RENDER; | |
| /* Draw */ | |
| CGContextSetShadowWithColor(layerContext, offset, blur, [color CGColor]); | |
| CGContextBeginTransparencyLayer(layerContext, NULL); | |
| CGContextDrawImage(layerContext, layerRect, [self CGImage]); | |
| CGContextEndTransparencyLayer(layerContext); | |
| /* Render */ | |
| cg_image = CGBitmapContextCreateImage(layerContext); | |
| if (!cg_image) | |
| goto END_RENDER; | |
| if ([UIImage respondsToSelector:@selector(imageWithCGImage:scale:orientation:)]) | |
| { | |
| image = [UIImage imageWithCGImage:cg_image scale:scale orientation:UIImageOrientationUp]; | |
| } | |
| else | |
| { | |
| image = [UIImage imageWithCGImage:cg_image]; | |
| } | |
| END_RENDER: | |
| if (colorspace != NULL) | |
| CGColorSpaceRelease(colorspace); | |
| if (layerContext != NULL) | |
| CGContextRelease(layerContext); | |
| if (cg_image != NULL) | |
| CGImageRelease(cg_image); | |
| if (layerBytes != NULL) | |
| free(layerBytes); | |
| return image; | |
| } | |
| - (UIImage *)ct_imageWithOverlayColor:(UIColor *)color | |
| { | |
| CGColorSpaceRef colorspace = NULL; | |
| CGContextRef layerContext = NULL; | |
| void *layerBytes = NULL; | |
| CGImageRef cg_image = NULL; | |
| UIImage *image = nil; | |
| CGFloat scale = [self respondsToSelector:@selector(scale)] ? [self scale] : 1; | |
| CGSize size = [self size]; | |
| if ([UIImage respondsToSelector:@selector(imageWithCGImage:scale:orientation:)]) | |
| { | |
| size = CGSizeMake(size.width * scale, size.height * scale); | |
| } | |
| else | |
| { | |
| scale = 1; | |
| } | |
| /* Setup */ | |
| colorspace = CGColorSpaceCreateDeviceRGB(); | |
| CGRect layerRect = CGRectMake(0, 0, size.width, size.height); | |
| layerBytes = calloc(size.width * size.height, 4); | |
| if (!layerBytes) | |
| goto END_RENDER; | |
| layerContext = CGBitmapContextCreate( | |
| layerBytes, | |
| size.width, | |
| size.height, | |
| 8, | |
| 4 * size.width, | |
| colorspace, | |
| kCGImageAlphaPremultipliedLast); | |
| if (!layerContext) | |
| goto END_RENDER; | |
| /* Draw */ | |
| CGContextDrawImage(layerContext, layerRect, [self CGImage]); | |
| CGContextSetBlendMode(layerContext, kCGBlendModeSourceIn); | |
| CGContextSetFillColorWithColor(layerContext, [color CGColor]); | |
| CGContextFillRect(layerContext, layerRect); | |
| /* Render */ | |
| cg_image = CGBitmapContextCreateImage(layerContext); | |
| if (!cg_image) | |
| goto END_RENDER; | |
| if ([UIImage respondsToSelector:@selector(imageWithCGImage:scale:orientation:)]) | |
| { | |
| image = [UIImage imageWithCGImage:cg_image scale:scale orientation:UIImageOrientationUp]; | |
| } | |
| else | |
| { | |
| image = [UIImage imageWithCGImage:cg_image]; | |
| } | |
| END_RENDER: | |
| if (colorspace != NULL) | |
| CGColorSpaceRelease(colorspace); | |
| if (layerContext != NULL) | |
| CGContextRelease(layerContext); | |
| if (cg_image != NULL) | |
| CGImageRelease(cg_image); | |
| if (layerBytes != NULL) | |
| free(layerBytes); | |
| return image; | |
| } | |
| - (UIImage *)ct_imageWithInnerShadowOffset:(CGSize)offset color:(UIColor *)color | |
| { | |
| CGColorSpaceRef colorspace = NULL; | |
| CGContextRef layerContext = NULL; | |
| void *layerBytes = NULL; | |
| CGImageRef cg_image = NULL; | |
| UIImage *image = nil; | |
| CGFloat scale = [self respondsToSelector:@selector(scale)] ? [self scale] : 1; | |
| CGSize size = [self size]; | |
| if ([UIImage respondsToSelector:@selector(imageWithCGImage:scale:orientation:)]) | |
| { | |
| size = CGSizeMake(size.width * scale, size.height * scale); | |
| offset = CGSizeMake(offset.width * scale, offset.height * scale); | |
| } | |
| else | |
| { | |
| scale = 1; | |
| } | |
| offset = CGSizeMake(offset.width, -offset.height); | |
| /* Setup */ | |
| colorspace = CGColorSpaceCreateDeviceRGB(); | |
| CGRect layerRect = CGRectMake(0, 0, size.width, size.height); | |
| layerBytes = calloc(size.width * size.height, 4); | |
| if (!layerBytes) | |
| goto END_RENDER; | |
| layerContext = CGBitmapContextCreate( | |
| layerBytes, | |
| size.width, | |
| size.height, | |
| 8, | |
| 4 * size.width, | |
| colorspace, | |
| kCGImageAlphaPremultipliedLast); | |
| if (!layerContext) | |
| goto END_RENDER; | |
| /* Draw */ | |
| CGContextDrawImage(layerContext, layerRect, [self CGImage]); | |
| CGLayerRef shadowLayer = CGLayerCreateWithContext(layerContext, layerRect.size, NULL); | |
| CGContextRef shadowContext = CGLayerGetContext(shadowLayer); | |
| CGContextDrawImage(shadowContext, CGRectOffset(layerRect, offset.width, offset.height), [self CGImage]); | |
| CGContextSetBlendMode(shadowContext, kCGBlendModeSourceOut); | |
| CGContextSetFillColorWithColor(shadowContext, [color CGColor]); | |
| CGContextFillRect(shadowContext, layerRect); | |
| CGContextSetBlendMode(layerContext, kCGBlendModeSourceAtop); | |
| CGContextDrawLayerInRect(layerContext, layerRect, shadowLayer); | |
| CGLayerRelease(shadowLayer); | |
| /* Render */ | |
| cg_image = CGBitmapContextCreateImage(layerContext); | |
| if (!cg_image) | |
| goto END_RENDER; | |
| if ([UIImage respondsToSelector:@selector(imageWithCGImage:scale:orientation:)]) | |
| { | |
| image = [UIImage imageWithCGImage:cg_image scale:scale orientation:UIImageOrientationUp]; | |
| } | |
| else | |
| { | |
| image = [UIImage imageWithCGImage:cg_image]; | |
| } | |
| END_RENDER: | |
| if (colorspace != NULL) | |
| CGColorSpaceRelease(colorspace); | |
| if (layerContext != NULL) | |
| CGContextRelease(layerContext); | |
| if (cg_image != NULL) | |
| CGImageRelease(cg_image); | |
| if (layerBytes != NULL) | |
| free(layerBytes); | |
| return image; | |
| } | |
| @end |
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