1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
//
// 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 {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
[self setFlipped:NO];
[self gtm_createRepresentationOfSize:NSMakeSize(16, 16)];
[self gtm_createRepresentationOfSize:NSMakeSize(32, 32)];
[self setScalesWhenResized:NO];
#pragma clang diagnostic pop
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];
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
[duplicate setFlipped:NO];
#pragma clang diagnostic pop
return duplicate;
}
- (void)gtm_shrinkToSize:(NSSize)size {
[self gtm_createRepresentationOfSize:size];
[self setSize:size];
[self gtm_removeRepresentationsLargerThanSize:size];
}
@end
|
