gfx/skia/trunk/src/core/SkMipMap.cpp@129ffea94266
gfx/skia/trunk/src/core/SkMipMap.cpp
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
1 /*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
8 #include "SkMipMap.h"
9 #include "SkBitmap.h"
10 #include "SkColorPriv.h"
12 static void downsampleby2_proc32(SkBitmap* dst, int x, int y,
13 const SkBitmap& src) {
14 x <<= 1;
15 y <<= 1;
16 const SkPMColor* p = src.getAddr32(x, y);
17 const SkPMColor* baseP = p;
18 SkPMColor c, ag, rb;
20 c = *p; ag = (c >> 8) & 0xFF00FF; rb = c & 0xFF00FF;
21 if (x < src.width() - 1) {
22 p += 1;
23 }
24 c = *p; ag += (c >> 8) & 0xFF00FF; rb += c & 0xFF00FF;
26 p = baseP;
27 if (y < src.height() - 1) {
28 p += src.rowBytes() >> 2;
29 }
30 c = *p; ag += (c >> 8) & 0xFF00FF; rb += c & 0xFF00FF;
31 if (x < src.width() - 1) {
32 p += 1;
33 }
34 c = *p; ag += (c >> 8) & 0xFF00FF; rb += c & 0xFF00FF;
36 *dst->getAddr32(x >> 1, y >> 1) =
37 ((rb >> 2) & 0xFF00FF) | ((ag << 6) & 0xFF00FF00);
38 }
40 static inline uint32_t expand16(U16CPU c) {
41 return (c & ~SK_G16_MASK_IN_PLACE) | ((c & SK_G16_MASK_IN_PLACE) << 16);
42 }
44 // returns dirt in the top 16bits, but we don't care, since we only
45 // store the low 16bits.
46 static inline U16CPU pack16(uint32_t c) {
47 return (c & ~SK_G16_MASK_IN_PLACE) | ((c >> 16) & SK_G16_MASK_IN_PLACE);
48 }
50 static void downsampleby2_proc16(SkBitmap* dst, int x, int y,
51 const SkBitmap& src) {
52 x <<= 1;
53 y <<= 1;
54 const uint16_t* p = src.getAddr16(x, y);
55 const uint16_t* baseP = p;
56 SkPMColor c;
58 c = expand16(*p);
59 if (x < src.width() - 1) {
60 p += 1;
61 }
62 c += expand16(*p);
64 p = baseP;
65 if (y < src.height() - 1) {
66 p += src.rowBytes() >> 1;
67 }
68 c += expand16(*p);
69 if (x < src.width() - 1) {
70 p += 1;
71 }
72 c += expand16(*p);
74 *dst->getAddr16(x >> 1, y >> 1) = (uint16_t)pack16(c >> 2);
75 }
77 static uint32_t expand4444(U16CPU c) {
78 return (c & 0xF0F) | ((c & ~0xF0F) << 12);
79 }
81 static U16CPU collaps4444(uint32_t c) {
82 return (c & 0xF0F) | ((c >> 12) & ~0xF0F);
83 }
85 static void downsampleby2_proc4444(SkBitmap* dst, int x, int y,
86 const SkBitmap& src) {
87 x <<= 1;
88 y <<= 1;
89 const uint16_t* p = src.getAddr16(x, y);
90 const uint16_t* baseP = p;
91 uint32_t c;
93 c = expand4444(*p);
94 if (x < src.width() - 1) {
95 p += 1;
96 }
97 c += expand4444(*p);
99 p = baseP;
100 if (y < src.height() - 1) {
101 p += src.rowBytes() >> 1;
102 }
103 c += expand4444(*p);
104 if (x < src.width() - 1) {
105 p += 1;
106 }
107 c += expand4444(*p);
109 *dst->getAddr16(x >> 1, y >> 1) = (uint16_t)collaps4444(c >> 2);
110 }
112 SkMipMap::Level* SkMipMap::AllocLevels(int levelCount, size_t pixelSize) {
113 if (levelCount < 0) {
114 return NULL;
115 }
116 int64_t size = sk_64_mul(levelCount + 1, sizeof(Level)) + pixelSize;
117 if (!sk_64_isS32(size)) {
118 return NULL;
119 }
120 return (Level*)sk_malloc_throw(sk_64_asS32(size));
121 }
123 SkMipMap* SkMipMap::Build(const SkBitmap& src) {
124 void (*proc)(SkBitmap* dst, int x, int y, const SkBitmap& src);
126 const SkBitmap::Config config = src.config();
127 switch (config) {
128 case SkBitmap::kARGB_8888_Config:
129 proc = downsampleby2_proc32;
130 break;
131 case SkBitmap::kRGB_565_Config:
132 proc = downsampleby2_proc16;
133 break;
134 case SkBitmap::kARGB_4444_Config:
135 proc = downsampleby2_proc4444;
136 break;
137 case SkBitmap::kIndex8_Config:
138 case SkBitmap::kA8_Config:
139 default:
140 return NULL; // don't build mipmaps for these configs
141 }
143 SkAutoLockPixels alp(src);
144 if (!src.readyToDraw()) {
145 return NULL;
146 }
148 // whip through our loop to compute the exact size needed
149 size_t size = 0;
150 int countLevels = 0;
151 {
152 int width = src.width();
153 int height = src.height();
154 for (;;) {
155 width >>= 1;
156 height >>= 1;
157 if (0 == width || 0 == height) {
158 break;
159 }
160 size += SkBitmap::ComputeRowBytes(config, width) * height;
161 countLevels += 1;
162 }
163 }
164 if (0 == countLevels) {
165 return NULL;
166 }
168 Level* levels = SkMipMap::AllocLevels(countLevels, size);
169 if (NULL == levels) {
170 return NULL;
171 }
173 uint8_t* baseAddr = (uint8_t*)&levels[countLevels];
174 uint8_t* addr = baseAddr;
175 int width = src.width();
176 int height = src.height();
177 uint32_t rowBytes;
178 SkBitmap srcBM(src);
180 for (int i = 0; i < countLevels; ++i) {
181 width >>= 1;
182 height >>= 1;
183 rowBytes = SkToU32(SkBitmap::ComputeRowBytes(config, width));
185 levels[i].fPixels = addr;
186 levels[i].fWidth = width;
187 levels[i].fHeight = height;
188 levels[i].fRowBytes = rowBytes;
189 levels[i].fScale = (float)width / src.width();
191 SkBitmap dstBM;
192 dstBM.setConfig(config, width, height, rowBytes);
193 dstBM.setPixels(addr);
195 srcBM.lockPixels();
196 for (int y = 0; y < height; y++) {
197 for (int x = 0; x < width; x++) {
198 proc(&dstBM, x, y, srcBM);
199 }
200 }
201 srcBM.unlockPixels();
203 srcBM = dstBM;
204 addr += height * rowBytes;
205 }
206 SkASSERT(addr == baseAddr + size);
208 return SkNEW_ARGS(SkMipMap, (levels, countLevels, size));
209 }
211 ///////////////////////////////////////////////////////////////////////////////
213 //static int gCounter;
215 SkMipMap::SkMipMap(Level* levels, int count, size_t size)
216 : fSize(size), fLevels(levels), fCount(count) {
217 SkASSERT(levels);
218 SkASSERT(count > 0);
219 // SkDebugf("mips %d\n", ++gCounter);
220 }
222 SkMipMap::~SkMipMap() {
223 sk_free(fLevels);
224 // SkDebugf("mips %d\n", --gCounter);
225 }
227 static SkFixed compute_level(SkScalar scale) {
228 SkFixed s = SkAbs32(SkScalarToFixed(SkScalarInvert(scale)));
230 if (s < SK_Fixed1) {
231 return 0;
232 }
233 int clz = SkCLZ(s);
234 SkASSERT(clz >= 1 && clz <= 15);
235 return SkIntToFixed(15 - clz) + ((unsigned)(s << (clz + 1)) >> 16);
236 }
238 bool SkMipMap::extractLevel(SkScalar scale, Level* levelPtr) const {
239 if (scale >= SK_Scalar1) {
240 return false;
241 }
243 int level = compute_level(scale) >> 16;
244 SkASSERT(level >= 0);
245 if (level <= 0) {
246 return false;
247 }
249 if (level > fCount) {
250 level = fCount;
251 }
252 if (levelPtr) {
253 *levelPtr = fLevels[level - 1];
254 }
255 return true;
256 }
