| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkBitmapCache.h" |
| #include "SkResourceCache.h" |
| #include "SkMipMap.h" |
| #include "SkPixelRef.h" |
| #include "SkRect.h" |
| |
| /** |
| * Use this for bitmapcache and mipmapcache entries. |
| */ |
| uint64_t SkMakeResourceCacheSharedIDForBitmap(uint32_t bitmapGenID) { |
| uint64_t sharedID = SkSetFourByteTag('b', 'm', 'a', 'p'); |
| return (sharedID << 32) | bitmapGenID; |
| } |
| |
| void SkNotifyBitmapGenIDIsStale(uint32_t bitmapGenID) { |
| SkResourceCache::PostPurgeSharedID(SkMakeResourceCacheSharedIDForBitmap(bitmapGenID)); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| SkBitmap::Allocator* SkBitmapCache::GetAllocator() { |
| return SkResourceCache::GetAllocator(); |
| } |
| |
| /** |
| This function finds the bounds of the bitmap *within its pixelRef*. |
| If the bitmap lacks a pixelRef, it will return an empty rect, since |
| that doesn't make sense. This may be a useful enough function that |
| it should be somewhere else (in SkBitmap?). |
| */ |
| static SkIRect get_bounds_from_bitmap(const SkBitmap& bm) { |
| if (!(bm.pixelRef())) { |
| return SkIRect::MakeEmpty(); |
| } |
| SkIPoint origin = bm.pixelRefOrigin(); |
| return SkIRect::MakeXYWH(origin.fX, origin.fY, bm.width(), bm.height()); |
| } |
| |
| namespace { |
| static unsigned gBitmapKeyNamespaceLabel; |
| |
| struct BitmapKey : public SkResourceCache::Key { |
| public: |
| BitmapKey(uint32_t genID, SkScalar sx, SkScalar sy, const SkIRect& bounds) |
| : fGenID(genID) |
| , fScaleX(sx) |
| , fScaleY(sy) |
| , fBounds(bounds) |
| { |
| this->init(&gBitmapKeyNamespaceLabel, SkMakeResourceCacheSharedIDForBitmap(genID), |
| sizeof(fGenID) + sizeof(fScaleX) + sizeof(fScaleY) + sizeof(fBounds)); |
| } |
| |
| uint32_t fGenID; |
| SkScalar fScaleX; |
| SkScalar fScaleY; |
| SkIRect fBounds; |
| }; |
| |
| struct BitmapRec : public SkResourceCache::Rec { |
| BitmapRec(uint32_t genID, SkScalar scaleX, SkScalar scaleY, const SkIRect& bounds, |
| const SkBitmap& result) |
| : fKey(genID, scaleX, scaleY, bounds) |
| , fBitmap(result) |
| {} |
| |
| const Key& getKey() const override { return fKey; } |
| size_t bytesUsed() const override { return sizeof(fKey) + fBitmap.getSize(); } |
| |
| static bool Finder(const SkResourceCache::Rec& baseRec, void* contextBitmap) { |
| const BitmapRec& rec = static_cast<const BitmapRec&>(baseRec); |
| SkBitmap* result = (SkBitmap*)contextBitmap; |
| |
| *result = rec.fBitmap; |
| result->lockPixels(); |
| return SkToBool(result->getPixels()); |
| } |
| |
| private: |
| BitmapKey fKey; |
| SkBitmap fBitmap; |
| }; |
| } // namespace |
| |
| #define CHECK_LOCAL(localCache, localName, globalName, ...) \ |
| ((localCache) ? localCache->localName(__VA_ARGS__) : SkResourceCache::globalName(__VA_ARGS__)) |
| |
| bool SkBitmapCache::Find(const SkBitmap& src, SkScalar invScaleX, SkScalar invScaleY, SkBitmap* result, |
| SkResourceCache* localCache) { |
| if (0 == invScaleX || 0 == invScaleY) { |
| // degenerate, and the key we use for mipmaps |
| return false; |
| } |
| BitmapKey key(src.getGenerationID(), invScaleX, invScaleY, get_bounds_from_bitmap(src)); |
| |
| return CHECK_LOCAL(localCache, find, Find, key, BitmapRec::Finder, result); |
| } |
| |
| void SkBitmapCache::Add(const SkBitmap& src, SkScalar invScaleX, SkScalar invScaleY, |
| const SkBitmap& result, SkResourceCache* localCache) { |
| if (0 == invScaleX || 0 == invScaleY) { |
| // degenerate, and the key we use for mipmaps |
| return; |
| } |
| SkASSERT(result.isImmutable()); |
| BitmapRec* rec = SkNEW_ARGS(BitmapRec, (src.getGenerationID(), invScaleX, invScaleY, |
| get_bounds_from_bitmap(src), result)); |
| CHECK_LOCAL(localCache, add, Add, rec); |
| src.pixelRef()->notifyAddedToCache(); |
| } |
| |
| bool SkBitmapCache::Find(uint32_t genID, const SkIRect& subset, SkBitmap* result, |
| SkResourceCache* localCache) { |
| BitmapKey key(genID, SK_Scalar1, SK_Scalar1, subset); |
| |
| return CHECK_LOCAL(localCache, find, Find, key, BitmapRec::Finder, result); |
| } |
| |
| bool SkBitmapCache::Add(SkPixelRef* pr, const SkIRect& subset, const SkBitmap& result, |
| SkResourceCache* localCache) { |
| SkASSERT(result.isImmutable()); |
| |
| if (subset.isEmpty() |
| || subset.top() < 0 |
| || subset.left() < 0 |
| || result.width() != subset.width() |
| || result.height() != subset.height()) { |
| return false; |
| } else { |
| BitmapRec* rec = SkNEW_ARGS(BitmapRec, (pr->getGenerationID(), 1, 1, subset, result)); |
| |
| CHECK_LOCAL(localCache, add, Add, rec); |
| pr->notifyAddedToCache(); |
| return true; |
| } |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////////////////// |
| ////////////////////////////////////////////////////////////////////////////////////////// |
| |
| namespace { |
| static unsigned gMipMapKeyNamespaceLabel; |
| |
| struct MipMapKey : public SkResourceCache::Key { |
| public: |
| MipMapKey(uint32_t genID, const SkIRect& bounds) : fGenID(genID), fBounds(bounds) { |
| this->init(&gMipMapKeyNamespaceLabel, SkMakeResourceCacheSharedIDForBitmap(genID), |
| sizeof(fGenID) + sizeof(fBounds)); |
| } |
| |
| uint32_t fGenID; |
| SkIRect fBounds; |
| }; |
| |
| struct MipMapRec : public SkResourceCache::Rec { |
| MipMapRec(const SkBitmap& src, const SkMipMap* result) |
| : fKey(src.getGenerationID(), get_bounds_from_bitmap(src)) |
| , fMipMap(result) |
| { |
| fMipMap->attachToCacheAndRef(); |
| } |
| |
| virtual ~MipMapRec() { |
| fMipMap->detachFromCacheAndUnref(); |
| } |
| |
| const Key& getKey() const override { return fKey; } |
| size_t bytesUsed() const override { return sizeof(fKey) + fMipMap->size(); } |
| |
| static bool Finder(const SkResourceCache::Rec& baseRec, void* contextMip) { |
| const MipMapRec& rec = static_cast<const MipMapRec&>(baseRec); |
| const SkMipMap* mm = SkRef(rec.fMipMap); |
| // the call to ref() above triggers a "lock" in the case of discardable memory, |
| // which means we can now check for null (in case the lock failed). |
| if (NULL == mm->data()) { |
| mm->unref(); // balance our call to ref() |
| return false; |
| } |
| // the call must call unref() when they are done. |
| *(const SkMipMap**)contextMip = mm; |
| return true; |
| } |
| |
| private: |
| MipMapKey fKey; |
| const SkMipMap* fMipMap; |
| }; |
| } |
| |
| const SkMipMap* SkMipMapCache::FindAndRef(const SkBitmap& src, SkResourceCache* localCache) { |
| MipMapKey key(src.getGenerationID(), get_bounds_from_bitmap(src)); |
| const SkMipMap* result; |
| |
| if (!CHECK_LOCAL(localCache, find, Find, key, MipMapRec::Finder, &result)) { |
| result = NULL; |
| } |
| return result; |
| } |
| |
| static SkResourceCache::DiscardableFactory get_fact(SkResourceCache* localCache) { |
| return localCache ? localCache->GetDiscardableFactory() |
| : SkResourceCache::GetDiscardableFactory(); |
| } |
| |
| const SkMipMap* SkMipMapCache::AddAndRef(const SkBitmap& src, SkResourceCache* localCache) { |
| SkMipMap* mipmap = SkMipMap::Build(src, get_fact(localCache)); |
| if (mipmap) { |
| MipMapRec* rec = SkNEW_ARGS(MipMapRec, (src, mipmap)); |
| CHECK_LOCAL(localCache, add, Add, rec); |
| src.pixelRef()->notifyAddedToCache(); |
| } |
| return mipmap; |
| } |