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Side by Side Diff: src/core/SkMipMap.cpp

Issue 2036313002: SkMipMap::ComputeLevelSize to return SkISize (Closed) Base URL: https://skia.googlesource.com/skia.git@pipe-mipmap-levels-to-creation
Patch Set: Created 4 years, 6 months ago
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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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366 return nullptr; 366 return nullptr;
367 } 367 }
368 368
369 if (src.width() <= 1 && src.height() <= 1) { 369 if (src.width() <= 1 && src.height() <= 1) {
370 return nullptr; 370 return nullptr;
371 } 371 }
372 // whip through our loop to compute the exact size needed 372 // whip through our loop to compute the exact size needed
373 size_t size = 0; 373 size_t size = 0;
374 int countLevels = ComputeLevelCount(src.width(), src.height()); 374 int countLevels = ComputeLevelCount(src.width(), src.height());
375 for (int currentMipLevel = countLevels; currentMipLevel > 0; currentMipLevel --) { 375 for (int currentMipLevel = countLevels; currentMipLevel > 0; currentMipLevel --) {
376 SkSize mipSize = ComputeLevelSize(src.width(), src.height(), currentMipL evel); 376 SkISize mipSize = ComputeLevelSize(src.width(), src.height(), currentMip Level);
377 size += SkColorTypeMinRowBytes(ct, mipSize.fWidth) * mipSize.fHeight; 377 size += SkColorTypeMinRowBytes(ct, mipSize.fWidth) * mipSize.fHeight;
378 } 378 }
379 379
380 size_t storageSize = SkMipMap::AllocLevelsSize(countLevels, size); 380 size_t storageSize = SkMipMap::AllocLevelsSize(countLevels, size);
381 if (0 == storageSize) { 381 if (0 == storageSize) {
382 return nullptr; 382 return nullptr;
383 } 383 }
384 384
385 SkMipMap* mipmap; 385 SkMipMap* mipmap;
386 if (fact) { 386 if (fact) {
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489 // For example, it contains levels 1-x instead of 0-x. 489 // For example, it contains levels 1-x instead of 0-x.
490 // This is because the image used to create SkMipMap is the base level. 490 // This is because the image used to create SkMipMap is the base level.
491 // So subtract 1 from the mip level count. 491 // So subtract 1 from the mip level count.
492 if (mipLevelCount > 0) { 492 if (mipLevelCount > 0) {
493 --mipLevelCount; 493 --mipLevelCount;
494 } 494 }
495 495
496 return mipLevelCount; 496 return mipLevelCount;
497 } 497 }
498 498
499 SkSize SkMipMap::ComputeLevelSize(int baseWidth, int baseHeight, int level) { 499 SkISize SkMipMap::ComputeLevelSize(int baseWidth, int baseHeight, int level) {
500 if (baseWidth < 1 || baseHeight < 1) { 500 if (baseWidth < 1 || baseHeight < 1) {
501 return SkSize::Make(0, 0); 501 return SkISize::Make(0, 0);
502 } 502 }
503 503
504 int maxLevelCount = ComputeLevelCount(baseWidth, baseHeight); 504 int maxLevelCount = ComputeLevelCount(baseWidth, baseHeight);
505 if (level > maxLevelCount || level < 0) { 505 if (level > maxLevelCount || level < 0) {
506 return SkSize::Make(0, 0); 506 return SkISize::Make(0, 0);
507 } 507 }
508 if (level == 0) { 508 if (level == 0) {
509 return SkSize::Make(baseWidth, baseHeight); 509 return SkISize::Make(baseWidth, baseHeight);
510 } 510 }
511 511
512 // OpenGL's spec requires that each mipmap level have height/width equal to 512 // OpenGL's spec requires that each mipmap level have height/width equal to
513 // max(1, floor(original_height / 2^i) 513 // max(1, floor(original_height / 2^i)
514 // (or original_width) where i is the mipmap level. 514 // (or original_width) where i is the mipmap level.
515 515
516 int width = SkTMax(1, baseWidth >> level); 516 int width = SkTMax(1, baseWidth >> level);
517 int height = SkTMax(1, baseHeight >> level); 517 int height = SkTMax(1, baseHeight >> level);
518 518
519 return SkSize::Make(width, height); 519 return SkISize::Make(width, height);
520 } 520 }
521 521
522 /////////////////////////////////////////////////////////////////////////////// 522 ///////////////////////////////////////////////////////////////////////////////
523 523
524 bool SkMipMap::extractLevel(const SkSize& scaleSize, Level* levelPtr) const { 524 bool SkMipMap::extractLevel(const SkSize& scaleSize, Level* levelPtr) const {
525 if (nullptr == fLevels) { 525 if (nullptr == fLevels) {
526 return false; 526 return false;
527 } 527 }
528 528
529 SkASSERT(scaleSize.width() >= 0 && scaleSize.height() >= 0); 529 SkASSERT(scaleSize.width() >= 0 && scaleSize.height() >= 0);
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592 return false; 592 return false;
593 } 593 }
594 if (index > fCount - 1) { 594 if (index > fCount - 1) {
595 return false; 595 return false;
596 } 596 }
597 if (levelPtr) { 597 if (levelPtr) {
598 *levelPtr = fLevels[index]; 598 *levelPtr = fLevels[index];
599 } 599 }
600 return true; 600 return true;
601 } 601 }
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