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| 1 /* |
| 2 * Copyright 2015 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 #include "SkBmpCodec.h" |
| 9 #include "SkColorTable.h" |
| 10 #include "SkImageInfo.h" |
| 11 #include "SkTypes.h" |
| 12 |
| 13 /* |
| 14 * This class implements the decoding for bmp images that use an RLE encoding |
| 15 */ |
| 16 class SkBmpRLECodec : public SkBmpCodec { |
| 17 public: |
| 18 |
| 19 /* |
| 20 * Creates an instance of the decoder |
| 21 * |
| 22 * Called only by SkBmpCodec::NewFromStream |
| 23 * There should be no other callers despite this being public |
| 24 * |
| 25 * @param srcInfo contains the source width and height |
| 26 * @param stream the stream of encoded image data |
| 27 * @param bitsPerPixel the number of bits used to store each pixel |
| 28 * @param numColors the number of colors in the color table |
| 29 * @param bytesPerColor the number of bytes in the stream used to represent |
| 30 each color in the color table |
| 31 * @param offset the offset of the image pixel data from the end of the |
| 32 * headers |
| 33 * @param rowOrder indicates whether rows are ordered top-down or bottom-up |
| 34 * @param RLEBytes indicates the amount of data left in the stream |
| 35 * after decoding the headers |
| 36 */ |
| 37 SkBmpRLECodec(const SkImageInfo& srcInfo, SkStream* stream, |
| 38 uint16_t bitsPerPixel, uint32_t numColors, |
| 39 uint32_t bytesPerColor, uint32_t offset, |
| 40 SkBmpCodec::RowOrder rowOrder, size_t RLEBytes); |
| 41 |
| 42 protected: |
| 43 |
| 44 Result onGetPixels(const SkImageInfo& dstInfo, void* dst, |
| 45 size_t dstRowBytes, const Options&, SkPMColor*, |
| 46 int*) override; |
| 47 |
| 48 private: |
| 49 |
| 50 /* |
| 51 * Creates the color table |
| 52 * Sets colorCount to the new color count if it is non-NULL |
| 53 */ |
| 54 bool createColorTable(int* colorCount); |
| 55 |
| 56 bool initializeStreamBuffer(); |
| 57 |
| 58 /* |
| 59 * Set an RLE pixel using the color table |
| 60 */ |
| 61 void setPixel(void* dst, size_t dstRowBytes, |
| 62 const SkImageInfo& dstInfo, uint32_t x, uint32_t y, |
| 63 uint8_t index); |
| 64 /* |
| 65 * Set an RLE24 pixel from R, G, B values |
| 66 */ |
| 67 void setRGBPixel(void* dst, size_t dstRowBytes, |
| 68 const SkImageInfo& dstInfo, uint32_t x, uint32_t y, |
| 69 uint8_t red, uint8_t green, uint8_t blue); |
| 70 |
| 71 /* |
| 72 * Performs the bitmap decoding for RLE input format |
| 73 */ |
| 74 Result decode(const SkImageInfo& dstInfo, void* dst, |
| 75 size_t dstRowBytes, const Options& opts); |
| 76 |
| 77 SkAutoTUnref<SkColorTable> fColorTable; // owned |
| 78 const uint32_t fNumColors; |
| 79 const uint32_t fBytesPerColor; |
| 80 const uint32_t fOffset; |
| 81 SkAutoTDeleteArray<uint8_t> fStreamBuffer; |
| 82 size_t fRLEBytes; |
| 83 uint32_t fCurrRLEByte; |
| 84 |
| 85 typedef SkBmpCodec INHERITED; |
| 86 }; |
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