| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkCachingPixelRef_DEFINED |
| #define SkCachingPixelRef_DEFINED |
| |
| #include "SkImageInfo.h" |
| #include "SkImageGenerator.h" |
| #include "SkPixelRef.h" |
| |
| class SkColorTable; |
| |
| /** |
| * PixelRef which defers decoding until SkBitmap::lockPixels() is |
| * called. Caches the decoded images in the global |
| * SkScaledImageCache. When the pixels are unlocked, this cache may |
| * or be destroyed before the next lock. If so, onLockPixels will |
| * attempt to re-decode. |
| * |
| * Decoding is handled by the SkImageGenerator |
| */ |
| class SkCachingPixelRef : public SkPixelRef { |
| public: |
| SK_DECLARE_INST_COUNT(SkCachingPixelRef) |
| /** |
| * Takes ownership of SkImageGenerator. If this method fails for |
| * whatever reason, it will return false and immediatetely delete |
| * the generator. If it succeeds, it will modify destination |
| * bitmap. |
| * |
| * If Install fails or when the SkCachingPixelRef that is |
| * installed into destination is destroyed, it will call |
| * SkDELETE() on the generator. Therefore, generator should be |
| * allocated with SkNEW() or SkNEW_ARGS(). |
| */ |
| static bool Install(SkImageGenerator* gen, SkBitmap* dst); |
| |
| protected: |
| virtual ~SkCachingPixelRef(); |
| virtual bool onNewLockPixels(LockRec*) SK_OVERRIDE; |
| virtual void onUnlockPixels() SK_OVERRIDE; |
| virtual bool onLockPixelsAreWritable() const SK_OVERRIDE { return false; } |
| |
| virtual SkData* onRefEncodedData() SK_OVERRIDE { |
| return fImageGenerator->refEncodedData(); |
| } |
| |
| #ifdef SK_SUPPORT_LEGACY_PIXELREF_UNFLATTENABLE |
| // No need to flatten this object. When flattening an SkBitmap, |
| // SkWriteBuffer will check the encoded data and write that |
| // instead. |
| // Future implementations of SkWriteBuffer will need to |
| // special case for onRefEncodedData as well. |
| SK_DECLARE_UNFLATTENABLE_OBJECT() |
| #endif |
| |
| private: |
| SkImageGenerator* const fImageGenerator; |
| bool fErrorInDecoding; |
| void* fScaledCacheId; |
| const size_t fRowBytes; |
| |
| SkCachingPixelRef(const SkImageInfo&, SkImageGenerator*, size_t rowBytes); |
| |
| typedef SkPixelRef INHERITED; |
| }; |
| |
| #endif // SkCachingPixelRef_DEFINED |