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| 1 /* | |
| 2 * Copyright 2012 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 SkLazyPixelRef_DEFINED | |
| 9 #define SkLazyPixelRef_DEFINED | |
| 10 | |
| 11 #include "SkBitmapFactory.h" | |
| 12 #include "SkImage.h" | |
| 13 #include "SkImageCache.h" | |
| 14 #include "SkPixelRef.h" | |
| 15 #include "SkFlattenable.h" | |
| 16 #include "SkScaledImageCache.h" | |
| 17 | |
| 18 class SkColorTable; | |
| 19 class SkData; | |
| 20 class SkImageCache; | |
| 21 | |
| 22 #ifdef SK_DEBUG | |
| 23 #define LAZY_CACHE_STATS 1 | |
| 24 #elif !defined(LAZY_CACHE_STATS) | |
| 25 #define LAZY_CACHE_STATS 0 | |
| 26 #endif | |
| 27 | |
| 28 /** | |
| 29 * PixelRef which defers decoding until SkBitmap::lockPixels() is called. | |
| 30 */ | |
| 31 class SkLazyPixelRef : public SkPixelRef { | |
| 32 | |
| 33 public: | |
| 34 /** | |
| 35 * Create a new SkLazyPixelRef. | |
| 36 * @param SkData Encoded data representing the pixels. | |
| 37 * @param DecodeProc Called to decode the pixels when needed. Must be non-N
ULL. | |
| 38 * @param SkImageCache Object that handles allocating and freeing | |
| 39 * the pixel memory, as needed. If NULL, use the global | |
| 40 * SkScaledImageCache. | |
| 41 */ | |
| 42 SkLazyPixelRef(SkData*, SkBitmapFactory::DecodeProc, SkImageCache*); | |
| 43 | |
| 44 virtual ~SkLazyPixelRef(); | |
| 45 | |
| 46 #ifdef SK_DEBUG | |
| 47 intptr_t getCacheId() const { return fCacheId; } | |
| 48 #endif | |
| 49 | |
| 50 #if LAZY_CACHE_STATS | |
| 51 static int32_t GetCacheHits() { return gCacheHits; } | |
| 52 static int32_t GetCacheMisses() { return gCacheMisses; } | |
| 53 static void ResetCacheStats() { gCacheHits = gCacheMisses = 0; } | |
| 54 #endif | |
| 55 | |
| 56 // No need to flatten this object. When flattening an SkBitmap, SkOrderedWri
teBuffer will check | |
| 57 // the encoded data and write that instead. | |
| 58 // Future implementations of SkFlattenableWriteBuffer will need to special c
ase for | |
| 59 // onRefEncodedData as well. | |
| 60 SK_DECLARE_UNFLATTENABLE_OBJECT() | |
| 61 | |
| 62 protected: | |
| 63 virtual void* onLockPixels(SkColorTable**) SK_OVERRIDE; | |
| 64 virtual void onUnlockPixels() SK_OVERRIDE; | |
| 65 virtual bool onLockPixelsAreWritable() const SK_OVERRIDE { return false; } | |
| 66 virtual SkData* onRefEncodedData() SK_OVERRIDE; | |
| 67 virtual bool onImplementsDecodeInto() SK_OVERRIDE; | |
| 68 virtual bool onDecodeInto(int pow2, SkBitmap*) SK_OVERRIDE; | |
| 69 | |
| 70 private: | |
| 71 bool fErrorInDecoding; | |
| 72 SkData* fData; | |
| 73 SkBitmapFactory::DecodeProc fDecodeProc; | |
| 74 SkImageCache* fImageCache; | |
| 75 union { | |
| 76 SkImageCache::ID fCacheId; | |
| 77 SkScaledImageCache::ID* fScaledCacheId; | |
| 78 }; | |
| 79 size_t fRowBytes; | |
| 80 SkImageInfo fLazilyCachedInfo; | |
| 81 | |
| 82 #if LAZY_CACHE_STATS | |
| 83 static int32_t gCacheHits; | |
| 84 static int32_t gCacheMisses; | |
| 85 #endif | |
| 86 | |
| 87 // lazily initialized our cached info. Returns NULL on failure. | |
| 88 const SkImage::Info* getCachedInfo(); | |
| 89 void* lockScaledImageCachePixels(); | |
| 90 void* lockImageCachePixels(); | |
| 91 | |
| 92 | |
| 93 typedef SkPixelRef INHERITED; | |
| 94 }; | |
| 95 | |
| 96 #endif // SkLazyPixelRef_DEFINED | |
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Chromium Code Reviews
Issue 103033002:
Big Cleanup: SkBitmapFactory, SkLazyPixelRef, SkImageCache (Closed)
Base URL: https://skia.googlecode.com/svn/trunk