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| 1 |
| 2 /* |
| 3 * Copyright 2007 The Android Open Source Project |
| 4 * |
| 5 * Use of this source code is governed by a BSD-style license that can be |
| 6 * found in the LICENSE file. |
| 7 */ |
| 8 |
| 9 |
| 10 #ifndef IMAGE_CODEC_BMPDECODERHELPER_H__ |
| 11 #define IMAGE_CODEC_BMPDECODERHELPER_H__ |
| 12 |
| 13 /////////////////////////////////////////////////////////////////////////////// |
| 14 // this section is my current "glue" between google3 code and android. |
| 15 // will be fixed soon |
| 16 |
| 17 #include "SkTypes.h" |
| 18 #include <limits.h> |
| 19 #define DISALLOW_EVIL_CONSTRUCTORS(name) |
| 20 #define CHECK(predicate) SkASSERT(predicate) |
| 21 typedef uint8_t uint8; |
| 22 typedef uint32_t uint32; |
| 23 |
| 24 template <typename T> class scoped_array { |
| 25 private: |
| 26 T* ptr_; |
| 27 scoped_array(scoped_array const&); |
| 28 scoped_array& operator=(const scoped_array&); |
| 29 |
| 30 public: |
| 31 explicit scoped_array(T* p = 0) : ptr_(p) {} |
| 32 ~scoped_array() { |
| 33 delete[] ptr_; |
| 34 } |
| 35 |
| 36 void reset(T* p = 0) { |
| 37 if (p != ptr_) { |
| 38 delete[] ptr_; |
| 39 ptr_ = p; |
| 40 } |
| 41 } |
| 42 |
| 43 T& operator[](int i) const { |
| 44 return ptr_[i]; |
| 45 } |
| 46 }; |
| 47 |
| 48 /////////////////////////////////////////////////////////////////////////////// |
| 49 |
| 50 namespace image_codec { |
| 51 |
| 52 class BmpDecoderCallback { |
| 53 public: |
| 54 BmpDecoderCallback() { } |
| 55 virtual ~BmpDecoderCallback() {} |
| 56 |
| 57 /** |
| 58 * This is called once for an image. It is passed the width and height and |
| 59 * should return the address of a buffer that is large enough to store |
| 60 * all of the resulting pixels (widht * height * 3 bytes). If it returns nullp
tr, |
| 61 * then the decoder will abort, but return true, as the caller has received |
| 62 * valid dimensions. |
| 63 */ |
| 64 virtual uint8* SetSize(int width, int height) = 0; |
| 65 |
| 66 private: |
| 67 DISALLOW_EVIL_CONSTRUCTORS(BmpDecoderCallback); |
| 68 }; |
| 69 |
| 70 class BmpDecoderHelper { |
| 71 public: |
| 72 BmpDecoderHelper() { } |
| 73 ~BmpDecoderHelper() { } |
| 74 bool DecodeImage(const char* data, |
| 75 size_t len, |
| 76 int max_pixels, |
| 77 BmpDecoderCallback* callback); |
| 78 |
| 79 private: |
| 80 DISALLOW_EVIL_CONSTRUCTORS(BmpDecoderHelper); |
| 81 |
| 82 void DoRLEDecode(); |
| 83 void DoStandardDecode(); |
| 84 void PutPixel(int x, int y, uint8 col); |
| 85 |
| 86 int GetInt(); |
| 87 int GetShort(); |
| 88 uint8 GetByte(); |
| 89 int CalcShiftRight(uint32 mask); |
| 90 int CalcShiftLeft(uint32 mask); |
| 91 |
| 92 const uint8* data_; |
| 93 size_t pos_; |
| 94 size_t len_; |
| 95 int width_; |
| 96 int height_; |
| 97 int bpp_; |
| 98 int pixelPad_; |
| 99 int rowPad_; |
| 100 scoped_array<uint8> colTab_; |
| 101 uint32 redBits_; |
| 102 uint32 greenBits_; |
| 103 uint32 blueBits_; |
| 104 int redShiftRight_; |
| 105 int greenShiftRight_; |
| 106 int blueShiftRight_; |
| 107 int redShiftLeft_; |
| 108 int greenShiftLeft_; |
| 109 int blueShiftLeft_; |
| 110 uint8* output_; |
| 111 bool inverted_; |
| 112 }; |
| 113 |
| 114 } // namespace |
| 115 |
| 116 #endif |
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