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
|
// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "skia/ext/skia_utils_ios.h"
#import <ImageIO/ImageIO.h>
#import <UIKit/UIKit.h>
#include <stddef.h>
#include <stdint.h>
#include "base/apple/scoped_cftyperef.h"
#include "base/compiler_specific.h"
#include "base/ios/ios_util.h"
#include "base/logging.h"
#include "third_party/skia/include/utils/mac/SkCGUtils.h"
namespace {
const uint8_t kICOHeaderMagic[4] = {0x00, 0x00, 0x01, 0x00};
// Returns whether the data encodes an ico image.
bool EncodesIcoImage(NSData* image_data) {
if (image_data.length < std::size(kICOHeaderMagic))
return false;
return UNSAFE_TODO(memcmp(kICOHeaderMagic, image_data.bytes,
std::size(kICOHeaderMagic))) == 0;
}
} // namespace
namespace skia {
SkBitmap CGImageToSkBitmap(CGImageRef image, CGSize size, bool is_opaque) {
SkBitmap bitmap;
if (!image)
return bitmap;
if (!bitmap.tryAllocN32Pixels(size.width, size.height, is_opaque))
return bitmap;
void* data = bitmap.getPixels();
// Allocate a bitmap context with 4 components per pixel (BGRA). Apple
// recommends these flags for improved CG performance.
#define HAS_ARGB_SHIFTS(a, r, g, b) \
(SK_A32_SHIFT == (a) && SK_R32_SHIFT == (r) \
&& SK_G32_SHIFT == (g) && SK_B32_SHIFT == (b))
#if defined(SK_CPU_LENDIAN) && HAS_ARGB_SHIFTS(24, 16, 8, 0)
base::apple::ScopedCFTypeRef<CGColorSpaceRef> color_space(
CGColorSpaceCreateDeviceRGB());
base::apple::ScopedCFTypeRef<CGContextRef> context(CGBitmapContextCreate(
data, size.width, size.height, 8, size.width * 4, color_space.get(),
uint32_t{kCGImageAlphaPremultipliedFirst} | kCGBitmapByteOrder32Host));
#else
#error We require that Skia's and CoreGraphics's recommended \
image memory layout match.
#endif
#undef HAS_ARGB_SHIFTS
DCHECK(context);
if (!context)
return bitmap;
CGRect imageRect = CGRectMake(0.0, 0.0, size.width, size.height);
CGContextSetBlendMode(context.get(), kCGBlendModeCopy);
CGContextDrawImage(context.get(), imageRect, image);
return bitmap;
}
UIImage* SkBitmapToUIImageWithColorSpace(const SkBitmap& skia_bitmap,
CGFloat scale,
CGColorSpaceRef color_space) {
if (skia_bitmap.isNull())
return nil;
// First convert SkBitmap to CGImageRef.
base::apple::ScopedCFTypeRef<CGImageRef> cg_image(
SkCreateCGImageRefWithColorspace(skia_bitmap, color_space));
// Now convert to UIImage.
return [UIImage imageWithCGImage:cg_image.get()
scale:scale
orientation:UIImageOrientationUp];
}
std::vector<SkBitmap> ImageDataToSkBitmaps(NSData* image_data) {
return ImageDataToSkBitmapsWithMaxSize(image_data, CGFLOAT_MAX);
}
std::vector<SkBitmap> ImageDataToSkBitmapsWithMaxSize(NSData* image_data,
CGFloat max_size) {
DCHECK(image_data);
// On iOS 8.1.1 |CGContextDrawImage| crashes when processing images included
// in .ico files that are 88x88 pixels or larger (http://crbug.com/435068).
bool skip_images_88x88_or_larger =
base::ios::IsRunningOnOrLater(8, 1, 1) && EncodesIcoImage(image_data);
base::apple::ScopedCFTypeRef<CFDictionaryRef> empty_dictionary(
CFDictionaryCreate(NULL, NULL, NULL, 0, NULL, NULL));
std::vector<SkBitmap> frames;
base::apple::ScopedCFTypeRef<CGImageSourceRef> source(
CGImageSourceCreateWithData((CFDataRef)image_data,
empty_dictionary.get()));
size_t count = CGImageSourceGetCount(source.get());
for (size_t index = 0; index < count; ++index) {
base::apple::ScopedCFTypeRef<CGImageRef> cg_image(
CGImageSourceCreateImageAtIndex(source.get(), index,
empty_dictionary.get()));
CGSize size = CGSizeMake(CGImageGetWidth(cg_image.get()),
CGImageGetHeight(cg_image.get()));
if (size.width > max_size || size.height > max_size)
continue;
if (size.width >= 88 && size.height >= 88 && skip_images_88x88_or_larger)
continue;
const SkBitmap bitmap = CGImageToSkBitmap(cg_image.get(), size, false);
if (!bitmap.empty())
frames.push_back(bitmap);
}
DLOG_IF(WARNING, frames.size() != count) << "Only decoded " << frames.size()
<< " frames for " << count << " expected.";
return frames;
}
UIColor* UIColorFromSkColor(SkColor color) {
return [UIColor colorWithRed:SkColorGetR(color) / 255.0f
green:SkColorGetG(color) / 255.0f
blue:SkColorGetB(color) / 255.0f
alpha:SkColorGetA(color) / 255.0f];
}
} // namespace skia
|
