orta · September 13, 2012 16:32
diff --git a/UIImage+ImmediateLoading.h b/UIImage+ImmediateLoading.h
 //
 //  UIImage+ImmediateLoading.h
 //  Code taken from https://gist.github.com/259357
 //

 #import <Foundation/Foundation.h>

 @interface UIImage (UIImage_ImmediateLoading)

 - (UIImage*) initImmediateLoadWithContentsOfFile:(NSString*)path;
 + (UIImage*)imageImmediateLoadWithContentsOfFile:(NSString*)path;

 @end
diff --git a/UIImage+ImmediateLoading.m b/UIImage+ImmediateLoading.m
 //
 //  UIImage+ImmediateLoading.h
 //  Code taken from https://gist.github.com/259357
 //

 #import "UIImage+ImmediateLoading.h"

 @implementation UIImage (UIImage_ImmediateLoading)

 + (UIImage*)imageImmediateLoadWithContentsOfFile:(NSString*)path {
    return [[UIImage alloc] initImmediateLoadWithContentsOfFile: path] ;
 }

 - (UIImage*) initImmediateLoadWithContentsOfFile:(NSString*)path {
    UIImage *image = [[UIImage alloc] initWithContentsOfFile:path];
    if(!image) return nil;

    CGImageRef imageRef = [image CGImage];
    CGColorSpaceRef gray = CGColorSpaceCreateDeviceGray();
    CGColorSpaceRef colorSpace = CGImageGetColorSpace(imageRef);
    //Stack Overflow and this original gist tell us kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Little
    // is required for the work to stay off the main thread but we can't source this
    //Considering you can't create a bitmap context for a grayscale with those flags,
    //we'll take out chances this way
    CGBitmapInfo info;
    if (colorSpace == gray) {
        info = kCGImageAlphaNone;
    } else {
        info = kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Little;
    }
    CGColorSpaceRelease(gray);
    CGRect rect = CGRectMake(0.f, 0.f, CGImageGetWidth(imageRef), CGImageGetHeight(imageRef));
    CGContextRef bitmapContext = CGBitmapContextCreate(NULL,
                                                       rect.size.width,
                                                       rect.size.height,
                                                       CGImageGetBitsPerComponent(imageRef),
                                                       CGImageGetBytesPerRow(imageRef),
                                                       colorSpace,
                                                       info
                                                       );

    CGContextDrawImage(bitmapContext, rect, imageRef);
    CGImageRef decompressedImageRef = CGBitmapContextCreateImage(bitmapContext);
    UIImage* decompressedImage = [[UIImage alloc] initWithCGImage: decompressedImageRef];
    CGImageRelease(decompressedImageRef);
    CGContextRelease(bitmapContext);

    return decompressedImage;
 }

 @end
	//
	// UIImage+ImmediateLoading.h
	// Code taken from https://gist.github.com/259357
	//

	#import <Foundation/Foundation.h>

	@interface UIImage (UIImage_ImmediateLoading)

	- (UIImage) initImmediateLoadWithContentsOfFile:(NSString)path;
	+ (UIImage)imageImmediateLoadWithContentsOfFile:(NSString)path;

	@end
	//
	// UIImage+ImmediateLoading.h
	// Code taken from https://gist.github.com/259357
	//

	#import "UIImage+ImmediateLoading.h"

	@implementation UIImage (UIImage_ImmediateLoading)

	+ (UIImage)imageImmediateLoadWithContentsOfFile:(NSString)path {
	return [[UIImage alloc] initImmediateLoadWithContentsOfFile: path] ;
	}

	- (UIImage) initImmediateLoadWithContentsOfFile:(NSString)path {
	UIImage *image = [[UIImage alloc] initWithContentsOfFile:path];
	if(!image) return nil;

	CGImageRef imageRef = [image CGImage];
	CGColorSpaceRef gray = CGColorSpaceCreateDeviceGray();
	CGColorSpaceRef colorSpace = CGImageGetColorSpace(imageRef);
	//Stack Overflow and this original gist tell us kCGImageAlphaPremultipliedFirst \| kCGBitmapByteOrder32Little
	// is required for the work to stay off the main thread but we can't source this
	//Considering you can't create a bitmap context for a grayscale with those flags,
	//we'll take out chances this way
	CGBitmapInfo info;
	if (colorSpace == gray) {
	info = kCGImageAlphaNone;
	} else {
	info = kCGImageAlphaPremultipliedFirst \| kCGBitmapByteOrder32Little;
	}
	CGColorSpaceRelease(gray);
	CGRect rect = CGRectMake(0.f, 0.f, CGImageGetWidth(imageRef), CGImageGetHeight(imageRef));
	CGContextRef bitmapContext = CGBitmapContextCreate(NULL,
	rect.size.width,
	rect.size.height,
	CGImageGetBitsPerComponent(imageRef),
	CGImageGetBytesPerRow(imageRef),
	colorSpace,
	info
	);

	CGContextDrawImage(bitmapContext, rect, imageRef);
	CGImageRef decompressedImageRef = CGBitmapContextCreateImage(bitmapContext);
	UIImage* decompressedImage = [[UIImage alloc] initWithCGImage: decompressedImageRef];
	CGImageRelease(decompressedImageRef);
	CGContextRelease(bitmapContext);

	return decompressedImage;
	}

	@end