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comparison: gfx/skia/trunk/src/lazy/SkCachingPixelRef.h
gfx/skia/trunk/src/lazy/SkCachingPixelRef.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:edfc199321ab |
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| 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 | |
| 8 #ifndef SkCachingPixelRef_DEFINED | |
| 9 #define SkCachingPixelRef_DEFINED | |
| 10 | |
| 11 #include "SkImageInfo.h" | |
| 12 #include "SkImageGenerator.h" | |
| 13 #include "SkPixelRef.h" | |
| 14 | |
| 15 class SkColorTable; | |
| 16 | |
| 17 /** | |
| 18 * PixelRef which defers decoding until SkBitmap::lockPixels() is | |
| 19 * called. Caches the decoded images in the global | |
| 20 * SkScaledImageCache. When the pixels are unlocked, this cache may | |
| 21 * or be destroyed before the next lock. If so, onLockPixels will | |
| 22 * attempt to re-decode. | |
| 23 * | |
| 24 * Decoding is handled by the SkImageGenerator | |
| 25 */ | |
| 26 class SkCachingPixelRef : public SkPixelRef { | |
| 27 public: | |
| 28 SK_DECLARE_INST_COUNT(SkCachingPixelRef) | |
| 29 /** | |
| 30 * Takes ownership of SkImageGenerator. If this method fails for | |
| 31 * whatever reason, it will return false and immediatetely delete | |
| 32 * the generator. If it succeeds, it will modify destination | |
| 33 * bitmap. | |
| 34 * | |
| 35 * If Install fails or when the SkCachingPixelRef that is | |
| 36 * installed into destination is destroyed, it will call | |
| 37 * SkDELETE() on the generator. Therefore, generator should be | |
| 38 * allocated with SkNEW() or SkNEW_ARGS(). | |
| 39 */ | |
| 40 static bool Install(SkImageGenerator* gen, SkBitmap* dst); | |
| 41 | |
| 42 protected: | |
| 43 virtual ~SkCachingPixelRef(); | |
| 44 virtual bool onNewLockPixels(LockRec*) SK_OVERRIDE; | |
| 45 virtual void onUnlockPixels() SK_OVERRIDE; | |
| 46 virtual bool onLockPixelsAreWritable() const SK_OVERRIDE { return false; } | |
| 47 | |
| 48 virtual SkData* onRefEncodedData() SK_OVERRIDE { | |
| 49 return fImageGenerator->refEncodedData(); | |
| 50 } | |
| 51 // No need to flatten this object. When flattening an SkBitmap, | |
| 52 // SkWriteBuffer will check the encoded data and write that | |
| 53 // instead. | |
| 54 // Future implementations of SkWriteBuffer will need to | |
| 55 // special case for onRefEncodedData as well. | |
| 56 SK_DECLARE_UNFLATTENABLE_OBJECT() | |
| 57 | |
| 58 private: | |
| 59 SkImageGenerator* const fImageGenerator; | |
| 60 bool fErrorInDecoding; | |
| 61 void* fScaledCacheId; | |
| 62 const size_t fRowBytes; | |
| 63 | |
| 64 SkCachingPixelRef(const SkImageInfo&, SkImageGenerator*, size_t rowBytes); | |
| 65 | |
| 66 typedef SkPixelRef INHERITED; | |
| 67 }; | |
| 68 | |
| 69 #endif // SkCachingPixelRef_DEFINED |
