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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 SkDecodingImageGenerator_DEFINED |
| 9 #define SkDecodingImageGenerator_DEFINED |
| 10 |
| 11 #include "SkImageGenerator.h" |
| 12 |
| 13 class SkBitmap; |
| 14 |
| 15 /** |
| 16 * Calls into SkImageDecoder::DecodeMemoryToTarget to implement a |
| 17 * SkImageGenerator |
| 18 */ |
| 19 class SkDecodingImageGenerator : public SkImageGenerator { |
| 20 public: |
| 21 /* |
| 22 * The constructor will take a reference to the SkData. |
| 23 */ |
| 24 SkDecodingImageGenerator(SkData* data); |
| 25 virtual ~SkDecodingImageGenerator(); |
| 26 |
| 27 /** |
| 28 * Return a ref to the encoded (i.e. compressed) representation, |
| 29 * of this data. The caller is responsible for calling unref() |
| 30 * on the data when it is finished. |
| 31 */ |
| 32 virtual SkData* refEncodedData() SK_OVERRIDE; |
| 33 |
| 34 /** |
| 35 * Return some information about the image, allowing the owner fo |
| 36 * this ojbect to allocate pixels. |
| 37 * |
| 38 * @return false if anything goes wrong. |
| 39 */ |
| 40 virtual bool getInfo(SkImageInfo* info) SK_OVERRIDE; |
| 41 |
| 42 /** |
| 43 * Decode into the given pixels, a block of memory of size at |
| 44 * least (info.fHeight - 1) * rowBytes + (info.fWidth * |
| 45 * bytesPerPixel) |
| 46 * |
| 47 * @param info Should be identical to the info returned by |
| 48 * getInfo so that the implementation can confirm that the |
| 49 * caller knows what it is asking for (config, size). |
| 50 * This contract also allows the caller to specify |
| 51 * different output-configs, which the implementation can |
| 52 * decide to support or not. |
| 53 * |
| 54 * @return false if anything goes wrong. |
| 55 */ |
| 56 virtual bool getPixels(const SkImageInfo& info, |
| 57 void* pixels, |
| 58 size_t rowBytes) SK_OVERRIDE; |
| 59 |
| 60 /** |
| 61 * Install the SkData into the destination bitmap, using a new |
| 62 * SkDiscardablePixelRef and a new SkDecodingImageGenerator. |
| 63 */ |
| 64 static bool Install(SkData* data, SkBitmap* destination); |
| 65 |
| 66 private: |
| 67 SkData* fData; |
| 68 }; |
| 69 #endif // SkDecodingImageGenerator_DEFINED |
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