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
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkTypes.h"
#if defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)
#include "include/core/SkBitmap.h"
#include "include/private/SkColorData.h"
#include "include/private/base/SkMacros.h"
#include "include/private/base/SkTo.h"
#include "include/utils/mac/SkCGUtils.h"
#include "src/utils/mac/SkUniqueCFRef.h"
#include <climits>
#include <memory>
static CGBitmapInfo compute_cgalpha_info_rgba(SkAlphaType at) {
CGBitmapInfo info = kCGBitmapByteOrder32Big;
switch (at) {
case kUnknown_SkAlphaType: break;
case kOpaque_SkAlphaType: info |= kCGImageAlphaNoneSkipLast; break;
case kPremul_SkAlphaType: info |= kCGImageAlphaPremultipliedLast; break;
case kUnpremul_SkAlphaType: info |= kCGImageAlphaLast; break;
}
return info;
}
static CGBitmapInfo compute_cgalpha_info_bgra(SkAlphaType at) {
CGBitmapInfo info = kCGBitmapByteOrder32Little;
switch (at) {
case kUnknown_SkAlphaType: break;
case kOpaque_SkAlphaType: info |= kCGImageAlphaNoneSkipFirst; break;
case kPremul_SkAlphaType: info |= kCGImageAlphaPremultipliedFirst; break;
case kUnpremul_SkAlphaType: info |= kCGImageAlphaFirst; break;
}
return info;
}
static CGBitmapInfo compute_cgalpha_info_4444(SkAlphaType at) {
CGBitmapInfo info = kCGBitmapByteOrder16Little;
switch (at) {
case kOpaque_SkAlphaType: info |= kCGImageAlphaNoneSkipLast; break;
default: info |= kCGImageAlphaPremultipliedLast; break;
}
return info;
}
static bool get_bitmap_info(SkColorType skColorType,
SkAlphaType skAlphaType,
size_t* bitsPerComponent,
CGBitmapInfo* info,
bool* upscaleTo32) {
if (upscaleTo32) {
*upscaleTo32 = false;
}
switch (skColorType) {
case kRGB_565_SkColorType:
if (upscaleTo32) {
*upscaleTo32 = true;
}
// now treat like RGBA
*bitsPerComponent = 8;
*info = compute_cgalpha_info_rgba(kOpaque_SkAlphaType);
break;
case kRGBA_8888_SkColorType:
*bitsPerComponent = 8;
*info = compute_cgalpha_info_rgba(skAlphaType);
break;
case kBGRA_8888_SkColorType:
*bitsPerComponent = 8;
*info = compute_cgalpha_info_bgra(skAlphaType);
break;
case kARGB_4444_SkColorType:
*bitsPerComponent = 4;
*info = compute_cgalpha_info_4444(skAlphaType);
break;
default:
return false;
}
return true;
}
static std::unique_ptr<SkBitmap> prepare_for_image_ref(const SkBitmap& bm,
size_t* bitsPerComponent,
CGBitmapInfo* info) {
bool upscaleTo32;
if (!get_bitmap_info(bm.colorType(), bm.alphaType(), bitsPerComponent, info, &upscaleTo32)) {
return nullptr;
}
if (upscaleTo32) {
std::unique_ptr<SkBitmap> copy(new SkBitmap);
// here we make a deep copy of the pixels, since CG won't take our
// 565 directly, so we always go to RGBA
copy->allocPixels(bm.info().makeColorType(kRGBA_8888_SkColorType));
bm.readPixels(copy->info(), copy->getPixels(), copy->rowBytes(), 0, 0);
return copy;
}
return std::make_unique<SkBitmap>(bm);
}
CGImageRef SkCreateCGImageRefWithColorspace(const SkBitmap& bm,
CGColorSpaceRef colorSpace) {
if (bm.drawsNothing()) {
return nullptr;
}
size_t bitsPerComponent SK_INIT_TO_AVOID_WARNING;
CGBitmapInfo info SK_INIT_TO_AVOID_WARNING;
std::unique_ptr<SkBitmap> bitmap = prepare_for_image_ref(bm, &bitsPerComponent, &info);
if (nullptr == bitmap) {
return nullptr;
}
SkPixmap pm = bitmap->pixmap(); // Copy bitmap info before releasing it.
const size_t s = bitmap->computeByteSize();
void* pixels = bitmap->getPixels();
// our provider "owns" the bitmap*, and will take care of deleting it
SkUniqueCFRef<CGDataProviderRef> dataRef(CGDataProviderCreateWithData(
bitmap.release(), pixels, s,
[](void* p, const void*, size_t) { delete reinterpret_cast<SkBitmap*>(p); }));
SkUniqueCFRef<CGColorSpaceRef> rgb;
if (nullptr == colorSpace) {
rgb.reset(CGColorSpaceCreateDeviceRGB());
colorSpace = rgb.get();
}
return CGImageCreate(pm.width(), pm.height(), bitsPerComponent,
pm.info().bytesPerPixel() * CHAR_BIT, pm.rowBytes(), colorSpace,
info, dataRef.get(), nullptr, false, kCGRenderingIntentDefault);
}
void SkCGDrawBitmap(CGContextRef cg, const SkBitmap& bm, float x, float y) {
SkUniqueCFRef<CGImageRef> img(SkCreateCGImageRef(bm));
if (img) {
CGRect r = CGRectMake(0, 0, bm.width(), bm.height());
CGContextSaveGState(cg);
CGContextTranslateCTM(cg, x, r.size.height + y);
CGContextScaleCTM(cg, 1, -1);
CGContextDrawImage(cg, r, img.get());
CGContextRestoreGState(cg);
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
CGContextRef SkCreateCGContext(const SkPixmap& pmap) {
CGBitmapInfo cg_bitmap_info = 0;
size_t bitsPerComponent = 0;
switch (pmap.colorType()) {
case kRGBA_8888_SkColorType:
bitsPerComponent = 8;
cg_bitmap_info = compute_cgalpha_info_rgba(pmap.alphaType());
break;
case kBGRA_8888_SkColorType:
bitsPerComponent = 8;
cg_bitmap_info = compute_cgalpha_info_bgra(pmap.alphaType());
break;
default:
return nullptr; // no other colortypes are supported (for now)
}
size_t rb = pmap.addr() ? pmap.rowBytes() : 0;
SkUniqueCFRef<CGColorSpaceRef> cs(CGColorSpaceCreateDeviceRGB());
CGContextRef cg = CGBitmapContextCreate(pmap.writable_addr(), pmap.width(), pmap.height(),
bitsPerComponent, rb, cs.get(), cg_bitmap_info);
return cg;
}
bool SkCopyPixelsFromCGImage(const SkImageInfo& info, size_t rowBytes, void* pixels,
CGImageRef image) {
CGBitmapInfo cg_bitmap_info = 0;
size_t bitsPerComponent = 0;
switch (info.colorType()) {
case kRGBA_8888_SkColorType:
bitsPerComponent = 8;
cg_bitmap_info = compute_cgalpha_info_rgba(info.alphaType());
break;
case kBGRA_8888_SkColorType:
bitsPerComponent = 8;
cg_bitmap_info = compute_cgalpha_info_bgra(info.alphaType());
break;
default:
return false; // no other colortypes are supported (for now)
}
SkUniqueCFRef<CGColorSpaceRef> cs(CGColorSpaceCreateDeviceRGB());
SkUniqueCFRef<CGContextRef> cg(CGBitmapContextCreate(
pixels, info.width(), info.height(), bitsPerComponent,
rowBytes, cs.get(), cg_bitmap_info));
if (!cg) {
return false;
}
// use this blend mode, to avoid having to erase the pixels first, and to avoid CG performing
// any blending (which could introduce errors and be slower).
CGContextSetBlendMode(cg.get(), kCGBlendModeCopy);
CGContextDrawImage(cg.get(), CGRectMake(0, 0, info.width(), info.height()), image);
return true;
}
bool SkCreateBitmapFromCGImage(SkBitmap* dst, CGImageRef image) {
const int width = SkToInt(CGImageGetWidth(image));
const int height = SkToInt(CGImageGetHeight(image));
SkImageInfo info = SkImageInfo::MakeN32Premul(width, height);
SkBitmap tmp;
if (!tmp.tryAllocPixels(info)) {
return false;
}
if (!SkCopyPixelsFromCGImage(tmp.info(), tmp.rowBytes(), tmp.getPixels(), image)) {
return false;
}
CGImageAlphaInfo cgInfo = CGImageGetAlphaInfo(image);
switch (cgInfo) {
case kCGImageAlphaNone:
case kCGImageAlphaNoneSkipLast:
case kCGImageAlphaNoneSkipFirst:
SkASSERT(SkBitmap::ComputeIsOpaque(tmp));
tmp.setAlphaType(kOpaque_SkAlphaType);
break;
default:
// we don't know if we're opaque or not, so compute it.
if (SkBitmap::ComputeIsOpaque(tmp)) {
tmp.setAlphaType(kOpaque_SkAlphaType);
}
}
*dst = tmp;
return true;
}
sk_sp<SkImage> SkMakeImageFromCGImage(CGImageRef src) {
SkBitmap bm;
if (!SkCreateBitmapFromCGImage(&bm, src)) {
return nullptr;
}
bm.setImmutable();
return bm.asImage();
}
#endif//defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)
|
