// // UIImageAdditions.m // Sample // // Created by Kirby Turner on 2/7/10. // Copyright 2010 White Peak Software Inc. All rights reserved. // #import "UIImage+KTCategory.h" @implementation UIImage (KTCategory) - (UIImage *)transformWidth:(CGFloat)width height:(CGFloat)height { CGFloat destW = width; CGFloat destH = height; CGFloat sourceW = width; CGFloat sourceH = height; CGImageRef imageRef = self.CGImage; CGContextRef bitmap = CGBitmapContextCreate(NULL, destW, destH, CGImageGetBitsPerComponent(imageRef), 4 * destW, CGImageGetColorSpace(imageRef), (kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst)); CGContextDrawImage(bitmap, CGRectMake(0, 0, sourceW, sourceH), imageRef); CGImageRef ref = CGBitmapContextCreateImage(bitmap); UIImage *result = [UIImage imageWithCGImage:ref]; CGContextRelease(bitmap); CGImageRelease(ref); return result; } - (UIImage *)scaleAspectToWidth:(CGFloat)width height:(CGFloat)height { CGFloat h = self.size.height; CGFloat w = self.size.width; if (h < height && w < width) { return self; } CGFloat ratio = (width / w) < (height / h)? (width / w): (height / h); CGSize newSize = CGSizeMake((NSInteger)(ratio * w), (NSInteger)(ratio * h)); UIGraphicsBeginImageContext(newSize); CGRect newRect = CGRectMake(0, 0, newSize.width, newSize.height); [self drawInRect:newRect]; UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return image; } - (UIImage *)minsizetoFillWith:(CGFloat)width height:(CGFloat)height{ CGFloat h = self.size.height; CGFloat w = self.size.width; if (h < height && w < width) { return self; } CGFloat ratio = (width / w) >(height / h)? (width / w): (height / h); CGSize newSize = CGSizeMake((NSInteger)(ratio * w), (NSInteger)(ratio * h)); UIGraphicsBeginImageContext(newSize); CGRect newRect = CGRectMake(0, 0, newSize.width, newSize.height); [self drawInRect:newRect]; UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext(); return scaledImage; } - (UIImage *)minscaleAspectToWidth:(CGFloat)width height:(CGFloat)height{ CGFloat h = self.size.height; CGFloat w = self.size.width; if (h < height && w < width) { return self; } // CGFloat ratio = (width / w) >(height / h)? (width / w): (height / h); // CGSize newSize = CGSizeMake((NSInteger)(ratio * w), (NSInteger)(ratio * h)); // UIGraphicsBeginImageContext(newSize); // CGRect newRect = CGRectMake(0, 0, newSize.width, newSize.height); // [self drawInRect:newRect]; // UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); // // image = [UIImage imageWithCGImage:CGImageCreateWithImageInRect([image CGImage], CGRectMake(0, 0, width, height))]; // UIGraphicsEndImageContext(); UIImage *newImage; CGSize newRect; float verticalRadio =self.size.height*1.0/width;// h float horizontalRadio = self.size.width*1.0/height;//w if (verticalRadio>=horizontalRadio) { UIGraphicsBeginImageContext(CGSizeMake(self.size.width/horizontalRadio,self.size.height/horizontalRadio)); [self drawInRect:CGRectMake(0, 0,self.size.width/horizontalRadio,self.size.height/horizontalRadio)]; UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); CGImageRef sourceImageRef = [scaledImage CGImage]; newRect = scaledImage.size; scaledImage = nil; CGImageRef newImageRef = CGImageCreateWithImageInRect(sourceImageRef, CGRectMake(0, (newRect.height- height)/2, width, height)); newImage = [UIImage imageWithCGImage:newImageRef]; sourceImageRef = nil; }else{ UIGraphicsBeginImageContext(CGSizeMake(self.size.width/verticalRadio,self.size.height/verticalRadio)); [self drawInRect:CGRectMake(0, 0,self.size.width/verticalRadio,self.size.height/verticalRadio)]; UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); CGImageRef sourceImageRef = [scaledImage CGImage]; newRect = scaledImage.size; scaledImage = nil; CGImageRef newImageRef = CGImageCreateWithImageInRect(sourceImageRef, CGRectMake((newRect.width - width)/2, 0, width, height)); newImage = [UIImage imageWithCGImage:newImageRef]; sourceImageRef = nil; } return newImage; } -(UIImage *)allminscaleAspectToWidth:(CGFloat)width height:(CGFloat)height{ UIImage *newImage; CGSize newRect; float verticalRadio =self.size.height*1.0/width;// h float horizontalRadio = self.size.width*1.0/height;//w if (verticalRadio>=horizontalRadio) { UIGraphicsBeginImageContext(CGSizeMake(self.size.width/horizontalRadio,self.size.height/horizontalRadio)); [self drawInRect:CGRectMake(0, 0,self.size.width/horizontalRadio,self.size.height/horizontalRadio)]; UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); CGImageRef sourceImageRef = [scaledImage CGImage]; newRect = scaledImage.size; scaledImage = nil; CGImageRef newImageRef = CGImageCreateWithImageInRect(sourceImageRef, CGRectMake(0, (newRect.height- height)/2, width, height)); newImage = [UIImage imageWithCGImage:newImageRef]; sourceImageRef = nil; }else{ UIGraphicsBeginImageContext(CGSizeMake(self.size.width/verticalRadio,self.size.height/verticalRadio)); [self drawInRect:CGRectMake(0, 0,self.size.width/verticalRadio,self.size.height/verticalRadio)]; UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); CGImageRef sourceImageRef = [scaledImage CGImage]; newRect = scaledImage.size; scaledImage = nil; CGImageRef newImageRef = CGImageCreateWithImageInRect(sourceImageRef, CGRectMake((newRect.width - width)/2, 0, width, height)); newImage = [UIImage imageWithCGImage:newImageRef]; sourceImageRef = nil; } return newImage; } - (UIImage *)imageScaleAspectToMaxSize:(CGFloat)newSize { CGSize size = [self size]; CGFloat ratio; if (size.width > size.height) { ratio = newSize / size.width; } else { ratio = newSize / size.height; } CGRect rect = CGRectMake(0.0, 0.0, round(ratio * size.width), round(ratio * size.height)); UIGraphicsBeginImageContext(rect.size); [self drawInRect:rect]; UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext(); return scaledImage; } - (UIImage *)fixRotation { if (self.imageOrientation == UIImageOrientationUp) return self; CGAffineTransform transform = CGAffineTransformIdentity; switch (self.imageOrientation) { case UIImageOrientationDown: case UIImageOrientationDownMirrored: transform = CGAffineTransformTranslate(transform, self.size.width, self.size.height); transform = CGAffineTransformRotate(transform, M_PI); break; case UIImageOrientationLeft: case UIImageOrientationLeftMirrored: transform = CGAffineTransformTranslate(transform, self.size.width, 0); transform = CGAffineTransformRotate(transform, M_PI_2); break; case UIImageOrientationRight: case UIImageOrientationRightMirrored: transform = CGAffineTransformTranslate(transform, 0, self.size.height); transform = CGAffineTransformRotate(transform, -M_PI_2); break; case UIImageOrientationUp: case UIImageOrientationUpMirrored: break; } switch (self.imageOrientation) { case UIImageOrientationUpMirrored: case UIImageOrientationDownMirrored: transform = CGAffineTransformTranslate(transform, self.size.width, 0); transform = CGAffineTransformScale(transform, -1, 1); break; case UIImageOrientationLeftMirrored: case UIImageOrientationRightMirrored: transform = CGAffineTransformTranslate(transform, self.size.height, 0); transform = CGAffineTransformScale(transform, -1, 1); break; case UIImageOrientationUp: case UIImageOrientationDown: case UIImageOrientationLeft: case UIImageOrientationRight: break; } // Now we draw the underlying CGImage into a new context, applying the transform // calculated above. CGContextRef ctx = CGBitmapContextCreate(NULL, self.size.width, self.size.height, CGImageGetBitsPerComponent(self.CGImage), 0, CGImageGetColorSpace(self.CGImage), CGImageGetBitmapInfo(self.CGImage)); CGContextConcatCTM(ctx, transform); switch (self.imageOrientation) { case UIImageOrientationLeft: case UIImageOrientationLeftMirrored: case UIImageOrientationRight: case UIImageOrientationRightMirrored: // Grr... CGContextDrawImage(ctx, CGRectMake(0, 0, self.size.height, self.size.width), self.CGImage); break; default: CGContextDrawImage(ctx, CGRectMake(0, 0, self.size.width, self.size.height), self.CGImage); break; } // And now we just create a new UIImage from the drawing context CGImageRef cgimg = CGBitmapContextCreateImage(ctx); UIImage *img = [UIImage imageWithCGImage:cgimg]; CGContextRelease(ctx); CGImageRelease(cgimg); return img; } - (UIImage *)imageScaleAndCropToMaxSize:(CGSize)newSize { CGFloat largestSize = (newSize.width > newSize.height) ? newSize.width : newSize.height; CGSize imageSize = [self size]; // Scale the image while mainting the aspect and making sure the // the scaled image is not smaller then the given new size. In // other words we calculate the aspect ratio using the largest // dimension from the new size and the small dimension from the // actual size. CGFloat ratio; if (imageSize.width > imageSize.height) { ratio = largestSize / imageSize.height; } else { ratio = largestSize / imageSize.width; } CGRect rect = CGRectMake(0.0, 0.0, ratio * imageSize.width, ratio * imageSize.height); UIGraphicsBeginImageContext(rect.size); [self drawInRect:rect]; UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext(); // Crop the image to the requested new size maintaining // the inner most parts of the image. CGFloat offsetX = 0; CGFloat offsetY = 0; imageSize = [scaledImage size]; if (imageSize.width < imageSize.height) { offsetY = (imageSize.height / 2) - (imageSize.width / 2); } else { offsetX = (imageSize.width / 2) - (imageSize.height / 2); } CGRect cropRect = CGRectMake(offsetX, offsetY, imageSize.width - (offsetX * 2), imageSize.height - (offsetY * 2)); CGImageRef croppedImageRef = CGImageCreateWithImageInRect([scaledImage CGImage], cropRect); UIImage *newImage = [UIImage imageWithCGImage:croppedImageRef]; CGImageRelease(croppedImageRef); return newImage; } @end