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//
// UIImage+Subimage.m
// pingle
//
// Created by robertsanders on 4/30/09.
// Copyright 2009 Robert Sanders. All rights reserved.
//
#import "UIImage+Subimage.h"
@implementation NibwareUIImage
@synthesize forcedOrientation, hasForcedOrientation;
- (id) initWithCGImage:(CGImageRef)imageRef orientation:(UIImageOrientation)orientation
{
self = [super initWithCGImage:imageRef];
self.forcedOrientation = orientation;
return self;
}
- (UIImageOrientation) imageOrientation
{
TRACEFUNC();
if (hasForcedOrientation) {
return forcedOrientation;
} else {
return [super imageOrientation];
}
}
- (void) setForcedOrientation:(UIImageOrientation)orientation
{
hasForcedOrientation = YES;
forcedOrientation = orientation;
}
- (CGSize) size
{
if (! hasForcedOrientation) {
return [super size];
}
CGSize size = [super size];
switch (forcedOrientation) {
case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
return CGSizeMake(size.height, size.width);
default:
return size;
}
}
@end
@implementation UIImage(Subimage)
- (CGAffineTransform) transformForOrientation
{
CGAffineTransform transform = CGAffineTransformIdentity;
CGImageRef imgRef = self.CGImage;
CGFloat width = CGImageGetWidth(imgRef);
CGFloat height = CGImageGetHeight(imgRef);
CGRect bounds = CGRectMake(0, 0, width, height);
CGSize imageSize = CGSizeMake(width, height);
CGFloat boundHeight;
switch(self.imageOrientation) {
case UIImageOrientationUp: //EXIF = 1
transform = CGAffineTransformIdentity;
break;
case UIImageOrientationUpMirrored: //EXIF = 2
transform = CGAffineTransformMakeTranslation(imageSize.width, 0.0);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
break;
case UIImageOrientationDown: //EXIF = 3
transform = CGAffineTransformMakeTranslation(imageSize.width, imageSize.height);
transform = CGAffineTransformRotate(transform, M_PI);
break;
case UIImageOrientationDownMirrored: //EXIF = 4
transform = CGAffineTransformMakeTranslation(0.0, imageSize.height);
transform = CGAffineTransformScale(transform, 1.0, -1.0);
break;
case UIImageOrientationLeftMirrored: //EXIF = 5
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(imageSize.height, imageSize.width);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
break;
case UIImageOrientationLeft: //EXIF = 6
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(0.0, imageSize.width);
transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
break;
case UIImageOrientationRightMirrored: //EXIF = 7
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeScale(-1.0, 1.0);
transform = CGAffineTransformRotate(transform, M_PI / 2.0);
break;
case UIImageOrientationRight: //EXIF = 8
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(imageSize.height, 0.0);
transform = CGAffineTransformRotate(transform, M_PI / 2.0);
break;
default:
[NSException raise:NSInternalInconsistencyException format:@"Invalid image orientation"];
}
return transform;
}
- (UIImage*)subImageInRect:(CGRect)rect
{
CGImageRef origCG = [self CGImage];
NSLog(@"UIImage(Subimage): orientation is %d, CG size = %d x %d",
[self imageOrientation], (int)CGImageGetWidth(origCG), (int)CGImageGetHeight(origCG));
NSLog(@" orig rect is %.0f,%.0f %.0f x %.0f",
rect.origin.x, rect.origin.y, rect.size.width, rect.size.height);
CGAffineTransform xform = [self transformForOrientation];
xform = CGAffineTransformInvert(xform);
rect = CGRectApplyAffineTransform(rect, xform);
NSLog(@" new rect is %.0f,%.0f %.0f x %.0f",
rect.origin.x, rect.origin.y, rect.size.width, rect.size.height);
CGImageRef newCG = CGImageCreateWithImageInRect(origCG, rect);
NSLog(@" resulting CG size = %d x %d",
(int)CGImageGetWidth(origCG), (int)CGImageGetHeight(origCG));
return [[[NibwareUIImage alloc] initWithCGImage:newCG orientation:[self imageOrientation]] autorelease];
}
- (UIImage*) imageWithoutOrientation
{
if (self.imageOrientation == UIImageOrientationUp) {
return self;
}
CGImageRef origCG = [self CGImage];
CGRect rect = CGRectMake(0, 0, CGImageGetWidth(origCG), CGImageGetHeight(origCG));
NSLog(@"UIImage(Subimage): orientation is %d, CG size = %d x %d",
[self imageOrientation], (int)CGImageGetWidth(origCG), (int)CGImageGetHeight(origCG));
NSLog(@" new rect is %.0f,%.0f %.0f x %.0f",
rect.origin.x, rect.origin.y, rect.size.width, rect.size.height);
CGImageRef newCG = CGImageCreateWithImageInRect(origCG, rect);
NSLog(@" resulting CG size = %d x %d",
(int)CGImageGetWidth(origCG), (int)CGImageGetHeight(origCG));
return [[[UIImage alloc] initWithCGImage:newCG] autorelease];
}
@end