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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 "SkBitmapCache.h" | |
| 12 #include "SkImageInfo.h" | |
| 13 #include "SkImageGenerator.h" | |
| 14 #include "SkPixelRef.h" | |
| 15 | |
| 16 class SkColorTable; | |
| 17 | |
| 18 /** | |
| 19 * PixelRef which defers decoding until SkBitmap::lockPixels() is | |
| 20 * called. Caches the decoded images in the global | |
| 21 * SkScaledImageCache. When the pixels are unlocked, this cache may | |
| 22 * or be destroyed before the next lock. If so, onLockPixels will | |
| 23 * attempt to re-decode. | |
| 24 * | |
| 25 * Decoding is handled by the SkImageGenerator | |
| 26 */ | |
| 27 class SkCachingPixelRef : public SkPixelRef { | |
| 28 public: | |
| 29 | |
| 30 /** | |
| 31 * Takes ownership of SkImageGenerator. If this method fails for | |
| 32 * whatever reason, it will return false and immediatetely delete | |
| 33 * the generator. If it succeeds, it will modify destination | |
| 34 * bitmap. | |
| 35 * | |
| 36 * If Install fails or when the SkCachingPixelRef that is | |
| 37 * installed into destination is destroyed, it will call | |
| 38 * `delete` on the generator. Therefore, generator should be | |
| 39 * allocated with `new`. | |
| 40 */ | |
| 41 static bool Install(SkImageGenerator* gen, SkBitmap* dst); | |
| 42 | |
| 43 protected: | |
| 44 virtual ~SkCachingPixelRef(); | |
| 45 bool onNewLockPixels(LockRec*) override; | |
| 46 void onUnlockPixels() override; | |
| 47 bool onLockPixelsAreWritable() const override { return false; } | |
| 48 | |
| 49 SkData* onRefEncodedData() override { | |
| 50 return fImageGenerator->refEncodedData(); | |
| 51 } | |
| 52 | |
| 53 bool onIsLazyGenerated() const override { return true; } | |
| 54 | |
| 55 private: | |
| 56 SkImageGenerator* const fImageGenerator; | |
| 57 bool fErrorInDecoding; | |
| 58 const size_t fRowBytes; | |
| 59 | |
| 60 SkBitmap fLockedBitmap; | |
| 61 | |
| 62 SkCachingPixelRef(const SkImageInfo&, SkImageGenerator*, size_t rowBytes); | |
| 63 | |
| 64 typedef SkPixelRef INHERITED; | |
| 65 }; | |
| 66 | |
| 67 #endif // SkCachingPixelRef_DEFINED | |
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Chromium Code Reviews
Issue 1369443002:
Revert "Revert of remove unused SkCachingPixelRef (patchset #1 id:1 of https://codereview.chromium.… (Closed)
Base URL: https://skia.googlesource.com/skia.git@master