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//
// GTMNSImage+Scaling.m
//
// Scales NSImages to a variety of sizes for drawing
//
// Copyright 2006-2008 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
#import "GTMNSImage+Scaling.h"
#import "GTMGeometryUtils.h"
@implementation NSImage (GTMNSImageScaling)
#if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_6
// If you are on SnowLeopard use
// -[NSImage bestRepresentationForRect:context:hints:]
- (NSImageRep *)gtm_bestRepresentationForSize:(NSSize)size {
NSImageRep *bestRep = [self gtm_representationOfSize:size];
if (bestRep) {
return bestRep;
}
NSArray *reps = [self representations];
CGFloat repDistance = CGFLOAT_MAX;
NSImageRep *thisRep;
GTM_FOREACH_OBJECT(thisRep, reps) {
CGFloat thisDistance;
thisDistance = MIN(size.width - [thisRep size].width,
size.height - [thisRep size].height);
if (repDistance < 0 && thisDistance > 0) continue;
if (ABS(thisDistance) < ABS(repDistance)
|| (thisDistance < 0 && repDistance > 0)) {
repDistance = thisDistance;
bestRep = thisRep;
}
}
if (!bestRep) {
bestRep = [self bestRepresentationForDevice:nil];
}
return bestRep;
}
#endif // MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_6
- (NSImageRep *)gtm_representationOfSize:(NSSize)size {
NSArray *reps = [self representations];
NSImageRep *thisRep;
GTM_FOREACH_OBJECT(thisRep, reps) {
if (NSEqualSizes([thisRep size], size)) {
return thisRep;
}
}
return nil;
}
- (BOOL)gtm_createIconRepresentations {
[self setFlipped:NO];
[self gtm_createRepresentationOfSize:NSMakeSize(16, 16)];
[self gtm_createRepresentationOfSize:NSMakeSize(32, 32)];
[self setScalesWhenResized:NO];
return YES;
}
- (BOOL)gtm_createRepresentationOfSize:(NSSize)size {
if ([self gtm_representationOfSize:size]) {
return NO;
}
NSBitmapImageRep *bestRep;
#if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_6
bestRep = (NSBitmapImageRep *)[self gtm_bestRepresentationForSize:size];
#else
bestRep
= (NSBitmapImageRep *)[self bestRepresentationForRect:GTMNSRectOfSize(size)
context:nil
hints:nil];
#endif // MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_6
NSRect drawRect = GTMNSScaleRectToRect(GTMNSRectOfSize([bestRep size]),
GTMNSRectOfSize(size),
GTMScaleProportionally,
GTMRectAlignCenter);
// Using NSSelectorFromString because CGImage isn't a declared selector
// on Tiger, and just using straight @selector(CGImage) will cause compile
// errors on a 10.4 SDK.
SEL cgImageSel = NSSelectorFromString(@"CGImage");
if ([bestRep respondsToSelector:cgImageSel]) {
CGImageRef imageRef = (CGImageRef)[bestRep performSelector:cgImageSel];
CGColorSpaceRef cspace = CGColorSpaceCreateDeviceRGB();
if (!cspace) return NO;
CGContextRef smallContext =
CGBitmapContextCreate(NULL,
size.width,
size.height,
8, // bits per component
size.width * 4, // bytes per pixel
cspace,
kCGBitmapByteOrder32Host
| kCGImageAlphaPremultipliedLast);
CFRelease(cspace);
if (!smallContext) return NO;
CGContextDrawImage(smallContext, GTMNSRectToCGRect(drawRect), imageRef);
CGImageRef smallImage = CGBitmapContextCreateImage(smallContext);
if (smallImage) {
NSBitmapImageRep *cgRep =
[[[NSBitmapImageRep alloc] initWithCGImage:smallImage] autorelease];
[self addRepresentation:cgRep];
CGImageRelease(smallImage);
} else {
CGContextRelease(smallContext);
return NO;
}
CGContextRelease(smallContext);
return YES;
} else {
// This functionality is here to allow it to work under Tiger
// It can probably only be called safely from the main thread
NSImage* scaledImage = [[NSImage alloc] initWithSize:size];
[scaledImage lockFocus];
NSGraphicsContext *graphicsContext = [NSGraphicsContext currentContext];
[graphicsContext setImageInterpolation:NSImageInterpolationHigh];
[graphicsContext setShouldAntialias:YES];
[bestRep drawInRect:drawRect];
NSBitmapImageRep* iconRep =
[[[NSBitmapImageRep alloc] initWithFocusedViewRect:
NSMakeRect(0, 0, size.width, size.height)] autorelease];
[scaledImage unlockFocus];
[scaledImage release];
[self addRepresentation:iconRep];
return YES;
}
return NO;
}
- (void)gtm_removeRepresentationsLargerThanSize:(NSSize)size {
NSMutableArray *repsToRemove = [NSMutableArray array];
NSImageRep *thisRep;
// Remove them in a second loop so we don't change things will doing the
// initial loop.
GTM_FOREACH_OBJECT(thisRep, [self representations]) {
if ([thisRep size].width > size.width
&& [thisRep size].height > size.height) {
[repsToRemove addObject:thisRep];
}
}
GTM_FOREACH_OBJECT(thisRep, repsToRemove) {
[self removeRepresentation:thisRep];
}
}
- (NSImage *)gtm_duplicateOfSize:(NSSize)size {
NSImage *duplicate = [[self copy] autorelease];
[duplicate gtm_shrinkToSize:size];
[duplicate setFlipped:NO];
return duplicate;
}
- (void)gtm_shrinkToSize:(NSSize)size {
[self gtm_createRepresentationOfSize:size];
[self setSize:size];
[self gtm_removeRepresentationsLargerThanSize:size];
}
@end
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