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1 /* | 1 /* |
2 * Copyright 2013 Google Inc. | 2 * Copyright 2013 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "SkMipMap.h" | 8 #include "SkMipMap.h" |
9 #include "SkBitmap.h" | 9 #include "SkBitmap.h" |
10 #include "SkColorPriv.h" | 10 #include "SkColorPriv.h" |
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218 srcBM = dstBM; | 218 srcBM = dstBM; |
219 addr += height * rowBytes; | 219 addr += height * rowBytes; |
220 } | 220 } |
221 SkASSERT(addr == baseAddr + size); | 221 SkASSERT(addr == baseAddr + size); |
222 | 222 |
223 return mipmap; | 223 return mipmap; |
224 } | 224 } |
225 | 225 |
226 /////////////////////////////////////////////////////////////////////////////// | 226 /////////////////////////////////////////////////////////////////////////////// |
227 | 227 |
228 #ifdef SK_SUPPORT_LEGACY_MIPLEVELCHOICE | 228 //static int gCounter; |
| 229 |
229 static SkFixed compute_level(SkScalar scale) { | 230 static SkFixed compute_level(SkScalar scale) { |
230 SkScalar inv = SkScalarAbs(SkScalarInvert(scale)); | 231 SkScalar inv = SkScalarAbs(SkScalarInvert(scale)); |
231 if (inv > 32767) { // Watch out for SkFixed overflow. | 232 if (inv > 32767) { // Watch out for SkFixed overflow. |
232 inv = 32767; | 233 inv = 32767; |
233 } | 234 } |
234 SkFixed s = SkScalarToFixed(inv); | 235 SkFixed s = SkScalarToFixed(inv); |
235 | 236 |
236 if (s < SK_Fixed1) { | 237 if (s < SK_Fixed1) { |
237 return 0; | 238 return 0; |
238 } | 239 } |
239 int clz = SkCLZ(s); | 240 int clz = SkCLZ(s); |
240 SkASSERT(clz >= 1 && clz <= 15); | 241 SkASSERT(clz >= 1 && clz <= 15); |
241 return SkIntToFixed(15 - clz) + ((unsigned)(s << (clz + 1)) >> 16); | 242 return SkIntToFixed(15 - clz) + ((unsigned)(s << (clz + 1)) >> 16); |
242 } | 243 } |
243 #endif | |
244 | 244 |
245 bool SkMipMap::extractLevel(SkScalar scale, Level* levelPtr) const { | 245 bool SkMipMap::extractLevel(SkScalar scale, Level* levelPtr) const { |
246 if (NULL == fLevels) { | 246 if (NULL == fLevels) { |
247 return false; | 247 return false; |
248 } | 248 } |
249 | 249 |
250 if (scale >= SK_Scalar1 || scale <= 0 || !SkScalarIsFinite(scale)) { | 250 if (scale >= SK_Scalar1) { |
251 return false; | 251 return false; |
252 } | 252 } |
253 | 253 |
254 #ifdef SK_SUPPORT_LEGACY_MIPLEVELCHOICE | |
255 int level = compute_level(scale) >> 16; | 254 int level = compute_level(scale) >> 16; |
256 #else | |
257 SkScalar L = -SkScalarLog2(scale); | |
258 if (!SkScalarIsFinite(L)) { | |
259 return false; | |
260 } | |
261 SkASSERT(L >= 0); | |
262 int level = SkScalarRoundToInt(L); | |
263 // SkDebugf("mipmap scale=%g L=%g level=%d\n", scale, L, level); | |
264 #endif | |
265 | |
266 SkASSERT(level >= 0); | 255 SkASSERT(level >= 0); |
267 if (level <= 0) { | 256 if (level <= 0) { |
268 return false; | 257 return false; |
269 } | 258 } |
270 | 259 |
271 if (level > fCount) { | 260 if (level > fCount) { |
272 level = fCount; | 261 level = fCount; |
273 } | 262 } |
274 if (levelPtr) { | 263 if (levelPtr) { |
275 *levelPtr = fLevels[level - 1]; | 264 *levelPtr = fLevels[level - 1]; |
276 } | 265 } |
277 return true; | 266 return true; |
278 } | 267 } |
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