reed@google.com | dc6c8ba | 2013-07-18 21:14:04 +0000 | [diff] [blame] | 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 | */ |
| 7 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 8 | #include "SkMipMap.h" |
| 9 | #include "SkBitmap.h" |
| 10 | #include "SkColorPriv.h" |
| 11 | |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 12 | static void downsample32_nocheck(void* dst, int, int, const void* srcPtr, const SkBitmap& srcBM) { |
| 13 | const uint32_t* p = static_cast<const uint32_t*>(srcPtr); |
| 14 | const uint32_t* baseP = p; |
| 15 | uint32_t c, ag, rb; |
| 16 | |
| 17 | c = *p; ag = (c >> 8) & 0xFF00FF; rb = c & 0xFF00FF; |
| 18 | p += 1; |
| 19 | |
| 20 | c = *p; ag += (c >> 8) & 0xFF00FF; rb += c & 0xFF00FF; |
| 21 | |
| 22 | p = baseP; |
| 23 | p += srcBM.rowBytes() >> 2; |
| 24 | |
| 25 | c = *p; ag += (c >> 8) & 0xFF00FF; rb += c & 0xFF00FF; |
| 26 | p += 1; |
| 27 | |
| 28 | c = *p; ag += (c >> 8) & 0xFF00FF; rb += c & 0xFF00FF; |
| 29 | |
| 30 | *(uint32_t*)dst = ((rb >> 2) & 0xFF00FF) | ((ag << 6) & 0xFF00FF00); |
| 31 | } |
| 32 | |
| 33 | static void downsample32_check(void* dst, int x, int y, const void* srcPtr, const SkBitmap& srcBM) { |
| 34 | const uint32_t* p = static_cast<const uint32_t*>(srcPtr); |
| 35 | const uint32_t* baseP = p; |
| 36 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 37 | x <<= 1; |
| 38 | y <<= 1; |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 39 | SkASSERT(srcBM.getAddr32(x, y) == p); |
| 40 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 41 | SkPMColor c, ag, rb; |
skia.committer@gmail.com | a799198 | 2013-07-19 07:00:57 +0000 | [diff] [blame] | 42 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 43 | c = *p; ag = (c >> 8) & 0xFF00FF; rb = c & 0xFF00FF; |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 44 | if (x < srcBM.width() - 1) { |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 45 | p += 1; |
| 46 | } |
| 47 | c = *p; ag += (c >> 8) & 0xFF00FF; rb += c & 0xFF00FF; |
skia.committer@gmail.com | a799198 | 2013-07-19 07:00:57 +0000 | [diff] [blame] | 48 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 49 | p = baseP; |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 50 | if (y < srcBM.height() - 1) { |
| 51 | p += srcBM.rowBytes() >> 2; |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 52 | } |
| 53 | c = *p; ag += (c >> 8) & 0xFF00FF; rb += c & 0xFF00FF; |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 54 | if (x < srcBM.width() - 1) { |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 55 | p += 1; |
| 56 | } |
| 57 | c = *p; ag += (c >> 8) & 0xFF00FF; rb += c & 0xFF00FF; |
skia.committer@gmail.com | a799198 | 2013-07-19 07:00:57 +0000 | [diff] [blame] | 58 | |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 59 | *((uint32_t*)dst) = ((rb >> 2) & 0xFF00FF) | ((ag << 6) & 0xFF00FF00); |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 60 | } |
| 61 | |
| 62 | static inline uint32_t expand16(U16CPU c) { |
| 63 | return (c & ~SK_G16_MASK_IN_PLACE) | ((c & SK_G16_MASK_IN_PLACE) << 16); |
| 64 | } |
| 65 | |
| 66 | // returns dirt in the top 16bits, but we don't care, since we only |
| 67 | // store the low 16bits. |
| 68 | static inline U16CPU pack16(uint32_t c) { |
| 69 | return (c & ~SK_G16_MASK_IN_PLACE) | ((c >> 16) & SK_G16_MASK_IN_PLACE); |
| 70 | } |
| 71 | |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 72 | static void downsample16(void* dst, int x, int y, const void* srcPtr, const SkBitmap& srcBM) { |
| 73 | const uint16_t* p = static_cast<const uint16_t*>(srcPtr); |
| 74 | const uint16_t* baseP = p; |
| 75 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 76 | x <<= 1; |
| 77 | y <<= 1; |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 78 | SkASSERT(srcBM.getAddr16(x, y) == p); |
| 79 | |
| 80 | SkPMColor c; |
skia.committer@gmail.com | a799198 | 2013-07-19 07:00:57 +0000 | [diff] [blame] | 81 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 82 | c = expand16(*p); |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 83 | if (x < srcBM.width() - 1) { |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 84 | p += 1; |
| 85 | } |
| 86 | c += expand16(*p); |
skia.committer@gmail.com | a799198 | 2013-07-19 07:00:57 +0000 | [diff] [blame] | 87 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 88 | p = baseP; |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 89 | if (y < srcBM.height() - 1) { |
| 90 | p += srcBM.rowBytes() >> 1; |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 91 | } |
| 92 | c += expand16(*p); |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 93 | if (x < srcBM.width() - 1) { |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 94 | p += 1; |
| 95 | } |
| 96 | c += expand16(*p); |
skia.committer@gmail.com | a799198 | 2013-07-19 07:00:57 +0000 | [diff] [blame] | 97 | |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 98 | *((uint16_t*)dst) = (uint16_t)pack16(c >> 2); |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 99 | } |
| 100 | |
| 101 | static uint32_t expand4444(U16CPU c) { |
| 102 | return (c & 0xF0F) | ((c & ~0xF0F) << 12); |
| 103 | } |
| 104 | |
| 105 | static U16CPU collaps4444(uint32_t c) { |
| 106 | return (c & 0xF0F) | ((c >> 12) & ~0xF0F); |
| 107 | } |
| 108 | |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 109 | static void downsample4444(void* dst, int x, int y, const void* srcPtr, const SkBitmap& srcBM) { |
| 110 | const uint16_t* p = static_cast<const uint16_t*>(srcPtr); |
| 111 | const uint16_t* baseP = p; |
| 112 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 113 | x <<= 1; |
| 114 | y <<= 1; |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 115 | SkASSERT(srcBM.getAddr16(x, y) == p); |
| 116 | |
| 117 | uint32_t c; |
skia.committer@gmail.com | a799198 | 2013-07-19 07:00:57 +0000 | [diff] [blame] | 118 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 119 | c = expand4444(*p); |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 120 | if (x < srcBM.width() - 1) { |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 121 | p += 1; |
| 122 | } |
| 123 | c += expand4444(*p); |
skia.committer@gmail.com | a799198 | 2013-07-19 07:00:57 +0000 | [diff] [blame] | 124 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 125 | p = baseP; |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 126 | if (y < srcBM.height() - 1) { |
| 127 | p += srcBM.rowBytes() >> 1; |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 128 | } |
| 129 | c += expand4444(*p); |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 130 | if (x < srcBM.width() - 1) { |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 131 | p += 1; |
| 132 | } |
| 133 | c += expand4444(*p); |
skia.committer@gmail.com | a799198 | 2013-07-19 07:00:57 +0000 | [diff] [blame] | 134 | |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 135 | *((uint16_t*)dst) = (uint16_t)collaps4444(c >> 2); |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 136 | } |
| 137 | |
reed | 0c9b1a8 | 2015-03-17 17:44:06 -0700 | [diff] [blame] | 138 | static void downsample8_nocheck(void* dst, int, int, const void* srcPtr, const SkBitmap& srcBM) { |
| 139 | const size_t rb = srcBM.rowBytes(); |
| 140 | const uint8_t* p = static_cast<const uint8_t*>(srcPtr); |
| 141 | *(uint8_t*)dst = (p[0] + p[1] + p[rb] + p[rb + 1]) >> 2; |
| 142 | } |
| 143 | |
| 144 | static void downsample8_check(void* dst, int x, int y, const void* srcPtr, const SkBitmap& srcBM) { |
| 145 | const uint8_t* p = static_cast<const uint8_t*>(srcPtr); |
| 146 | const uint8_t* baseP = p; |
| 147 | |
| 148 | x <<= 1; |
| 149 | y <<= 1; |
| 150 | SkASSERT(srcBM.getAddr8(x, y) == p); |
| 151 | |
| 152 | unsigned c = *p; |
| 153 | if (x < srcBM.width() - 1) { |
| 154 | p += 1; |
| 155 | } |
| 156 | c += *p; |
| 157 | |
| 158 | p = baseP; |
| 159 | if (y < srcBM.height() - 1) { |
| 160 | p += srcBM.rowBytes(); |
| 161 | } |
| 162 | c += *p; |
| 163 | if (x < srcBM.width() - 1) { |
| 164 | p += 1; |
| 165 | } |
| 166 | c += *p; |
| 167 | |
| 168 | *(uint8_t*)dst = c >> 2; |
| 169 | } |
| 170 | |
reed | 9d93c2e | 2014-10-08 05:17:12 -0700 | [diff] [blame] | 171 | size_t SkMipMap::AllocLevelsSize(int levelCount, size_t pixelSize) { |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 172 | if (levelCount < 0) { |
reed | 9d93c2e | 2014-10-08 05:17:12 -0700 | [diff] [blame] | 173 | return 0; |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 174 | } |
reed@google.com | 57212f9 | 2013-12-30 14:40:38 +0000 | [diff] [blame] | 175 | int64_t size = sk_64_mul(levelCount + 1, sizeof(Level)) + pixelSize; |
| 176 | if (!sk_64_isS32(size)) { |
reed | 9d93c2e | 2014-10-08 05:17:12 -0700 | [diff] [blame] | 177 | return 0; |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 178 | } |
reed | 9d93c2e | 2014-10-08 05:17:12 -0700 | [diff] [blame] | 179 | return sk_64_asS32(size); |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 180 | } |
| 181 | |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 182 | typedef void SkDownSampleProc(void*, int x, int y, const void* srcPtr, const SkBitmap& srcBM); |
| 183 | |
reed | 9d93c2e | 2014-10-08 05:17:12 -0700 | [diff] [blame] | 184 | SkMipMap* SkMipMap::Build(const SkBitmap& src, SkDiscardableFactoryProc fact) { |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 185 | SkDownSampleProc* proc_nocheck, *proc_check; |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 186 | |
commit-bot@chromium.org | a3264e5 | 2014-05-30 13:26:10 +0000 | [diff] [blame] | 187 | const SkColorType ct = src.colorType(); |
| 188 | const SkAlphaType at = src.alphaType(); |
| 189 | switch (ct) { |
| 190 | case kRGBA_8888_SkColorType: |
| 191 | case kBGRA_8888_SkColorType: |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 192 | proc_check = downsample32_check; |
| 193 | proc_nocheck = downsample32_nocheck; |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 194 | break; |
commit-bot@chromium.org | a3264e5 | 2014-05-30 13:26:10 +0000 | [diff] [blame] | 195 | case kRGB_565_SkColorType: |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 196 | proc_check = downsample16; |
| 197 | proc_nocheck = proc_check; |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 198 | break; |
commit-bot@chromium.org | a3264e5 | 2014-05-30 13:26:10 +0000 | [diff] [blame] | 199 | case kARGB_4444_SkColorType: |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 200 | proc_check = downsample4444; |
| 201 | proc_nocheck = proc_check; |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 202 | break; |
reed | 0c9b1a8 | 2015-03-17 17:44:06 -0700 | [diff] [blame] | 203 | case kAlpha_8_SkColorType: |
| 204 | case kGray_8_SkColorType: |
| 205 | proc_check = downsample8_check; |
| 206 | proc_nocheck = downsample8_nocheck; |
| 207 | break; |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 208 | default: |
commit-bot@chromium.org | a3264e5 | 2014-05-30 13:26:10 +0000 | [diff] [blame] | 209 | return NULL; // don't build mipmaps for any other colortypes (yet) |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 210 | } |
skia.committer@gmail.com | a799198 | 2013-07-19 07:00:57 +0000 | [diff] [blame] | 211 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 212 | SkAutoLockPixels alp(src); |
| 213 | if (!src.readyToDraw()) { |
| 214 | return NULL; |
| 215 | } |
| 216 | |
| 217 | // whip through our loop to compute the exact size needed |
| 218 | size_t size = 0; |
| 219 | int countLevels = 0; |
| 220 | { |
| 221 | int width = src.width(); |
| 222 | int height = src.height(); |
| 223 | for (;;) { |
| 224 | width >>= 1; |
| 225 | height >>= 1; |
| 226 | if (0 == width || 0 == height) { |
| 227 | break; |
| 228 | } |
commit-bot@chromium.org | a3264e5 | 2014-05-30 13:26:10 +0000 | [diff] [blame] | 229 | size += SkColorTypeMinRowBytes(ct, width) * height; |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 230 | countLevels += 1; |
| 231 | } |
| 232 | } |
| 233 | if (0 == countLevels) { |
| 234 | return NULL; |
| 235 | } |
skia.committer@gmail.com | a799198 | 2013-07-19 07:00:57 +0000 | [diff] [blame] | 236 | |
reed | 9d93c2e | 2014-10-08 05:17:12 -0700 | [diff] [blame] | 237 | size_t storageSize = SkMipMap::AllocLevelsSize(countLevels, size); |
| 238 | if (0 == storageSize) { |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 239 | return NULL; |
| 240 | } |
| 241 | |
reed | 9d93c2e | 2014-10-08 05:17:12 -0700 | [diff] [blame] | 242 | SkMipMap* mipmap; |
| 243 | if (fact) { |
| 244 | SkDiscardableMemory* dm = fact(storageSize); |
| 245 | if (NULL == dm) { |
| 246 | return NULL; |
| 247 | } |
| 248 | mipmap = SkNEW_ARGS(SkMipMap, (storageSize, dm)); |
| 249 | } else { |
| 250 | mipmap = SkNEW_ARGS(SkMipMap, (sk_malloc_throw(storageSize), storageSize)); |
| 251 | } |
| 252 | |
| 253 | // init |
| 254 | mipmap->fCount = countLevels; |
| 255 | mipmap->fLevels = (Level*)mipmap->writable_data(); |
| 256 | |
| 257 | Level* levels = mipmap->fLevels; |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 258 | uint8_t* baseAddr = (uint8_t*)&levels[countLevels]; |
| 259 | uint8_t* addr = baseAddr; |
| 260 | int width = src.width(); |
| 261 | int height = src.height(); |
| 262 | uint32_t rowBytes; |
| 263 | SkBitmap srcBM(src); |
skia.committer@gmail.com | a799198 | 2013-07-19 07:00:57 +0000 | [diff] [blame] | 264 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 265 | for (int i = 0; i < countLevels; ++i) { |
| 266 | width >>= 1; |
| 267 | height >>= 1; |
commit-bot@chromium.org | a3264e5 | 2014-05-30 13:26:10 +0000 | [diff] [blame] | 268 | rowBytes = SkToU32(SkColorTypeMinRowBytes(ct, width)); |
skia.committer@gmail.com | a799198 | 2013-07-19 07:00:57 +0000 | [diff] [blame] | 269 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 270 | levels[i].fPixels = addr; |
| 271 | levels[i].fWidth = width; |
| 272 | levels[i].fHeight = height; |
| 273 | levels[i].fRowBytes = rowBytes; |
reed@google.com | d94697c | 2013-07-24 14:31:33 +0000 | [diff] [blame] | 274 | levels[i].fScale = (float)width / src.width(); |
skia.committer@gmail.com | a799198 | 2013-07-19 07:00:57 +0000 | [diff] [blame] | 275 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 276 | SkBitmap dstBM; |
commit-bot@chromium.org | a3264e5 | 2014-05-30 13:26:10 +0000 | [diff] [blame] | 277 | dstBM.installPixels(SkImageInfo::Make(width, height, ct, at), addr, rowBytes); |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 278 | |
| 279 | srcBM.lockPixels(); |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 280 | const int widthEven = width & ~1; |
| 281 | const int heightEven = height & ~1; |
| 282 | const size_t pixelSize = srcBM.info().bytesPerPixel(); |
| 283 | |
| 284 | const void* srcBasePtr = srcBM.getPixels(); |
| 285 | void* dstBasePtr = dstBM.getPixels(); |
| 286 | for (int y = 0; y < heightEven; y++) { |
| 287 | const void* srcPtr = srcBasePtr; |
| 288 | void* dstPtr = dstBasePtr; |
| 289 | for (int x = 0; x < widthEven; x++) { |
| 290 | proc_nocheck(dstPtr, x, y, srcPtr, srcBM); |
| 291 | srcPtr = (char*)srcPtr + pixelSize * 2; |
| 292 | dstPtr = (char*)dstPtr + pixelSize; |
| 293 | } |
| 294 | if (width & 1) { |
| 295 | proc_check(dstPtr, widthEven, y, srcPtr, srcBM); |
| 296 | } |
| 297 | |
| 298 | srcBasePtr = (char*)srcBasePtr + srcBM.rowBytes() * 2; |
| 299 | dstBasePtr = (char*)dstBasePtr + dstBM.rowBytes(); |
| 300 | } |
| 301 | if (height & 1) { |
| 302 | const void* srcPtr = srcBasePtr; |
| 303 | void* dstPtr = dstBasePtr; |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 304 | for (int x = 0; x < width; x++) { |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 305 | proc_check(dstPtr, x, heightEven, srcPtr, srcBM); |
| 306 | srcPtr = (char*)srcPtr + pixelSize * 2; |
| 307 | dstPtr = (char*)dstPtr + pixelSize; |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 308 | } |
| 309 | } |
reed | dc14fa4 | 2015-01-27 05:01:50 -0800 | [diff] [blame] | 310 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 311 | srcBM.unlockPixels(); |
skia.committer@gmail.com | a799198 | 2013-07-19 07:00:57 +0000 | [diff] [blame] | 312 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 313 | srcBM = dstBM; |
| 314 | addr += height * rowBytes; |
| 315 | } |
| 316 | SkASSERT(addr == baseAddr + size); |
| 317 | |
reed | 9d93c2e | 2014-10-08 05:17:12 -0700 | [diff] [blame] | 318 | return mipmap; |
reed@google.com | d94697c | 2013-07-24 14:31:33 +0000 | [diff] [blame] | 319 | } |
| 320 | |
| 321 | /////////////////////////////////////////////////////////////////////////////// |
| 322 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 323 | bool SkMipMap::extractLevel(SkScalar scale, Level* levelPtr) const { |
reed | 9d93c2e | 2014-10-08 05:17:12 -0700 | [diff] [blame] | 324 | if (NULL == fLevels) { |
| 325 | return false; |
| 326 | } |
| 327 | |
reed | 7729e56 | 2015-01-16 08:35:09 -0800 | [diff] [blame] | 328 | if (scale >= SK_Scalar1 || scale <= 0 || !SkScalarIsFinite(scale)) { |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 329 | return false; |
| 330 | } |
| 331 | |
reed | 7729e56 | 2015-01-16 08:35:09 -0800 | [diff] [blame] | 332 | SkScalar L = -SkScalarLog2(scale); |
| 333 | if (!SkScalarIsFinite(L)) { |
| 334 | return false; |
| 335 | } |
| 336 | SkASSERT(L >= 0); |
reed | c1e1faa | 2015-05-06 13:02:37 -0700 | [diff] [blame^] | 337 | #ifdef SK_SUPPORT_LEGACY_ROUND_MIPMAP_LEVEL_CHOICE |
reed | 7729e56 | 2015-01-16 08:35:09 -0800 | [diff] [blame] | 338 | int level = SkScalarRoundToInt(L); |
reed | c1e1faa | 2015-05-06 13:02:37 -0700 | [diff] [blame^] | 339 | #else |
| 340 | // int rndLevel = SkScalarRoundToInt(L); |
| 341 | int level = SkScalarFloorToInt(L); |
| 342 | #endif |
| 343 | // SkDebugf("mipmap scale=%g L=%g level=%d rndLevel=%d\n", scale, L, level, rndLevel); |
reed | 7729e56 | 2015-01-16 08:35:09 -0800 | [diff] [blame] | 344 | |
reed@google.com | eed6f1b | 2013-07-18 19:53:31 +0000 | [diff] [blame] | 345 | SkASSERT(level >= 0); |
| 346 | if (level <= 0) { |
| 347 | return false; |
| 348 | } |
| 349 | |
| 350 | if (level > fCount) { |
| 351 | level = fCount; |
| 352 | } |
| 353 | if (levelPtr) { |
| 354 | *levelPtr = fLevels[level - 1]; |
| 355 | } |
| 356 | return true; |
| 357 | } |