reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2007, The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #ifndef IMAGE_CODEC_BMPDECODERHELPER_H__ |
| 18 | #define IMAGE_CODEC_BMPDECODERHELPER_H__ |
| 19 | |
| 20 | /////////////////////////////////////////////////////////////////////////////// |
| 21 | // this section is my current "glue" between google3 code and android. |
| 22 | // will be fixed soon |
| 23 | |
| 24 | #include "SkTypes.h" |
| 25 | #include <limits.h> |
| 26 | #define DISALLOW_EVIL_CONSTRUCTORS(name) |
| 27 | #define CHECK(predicate) SkASSERT(predicate) |
| 28 | typedef uint8_t uint8; |
| 29 | typedef uint32_t uint32; |
| 30 | |
| 31 | template <typename T> class scoped_array { |
| 32 | private: |
| 33 | T* ptr_; |
| 34 | scoped_array(scoped_array const&); |
| 35 | scoped_array& operator=(const scoped_array&); |
| 36 | |
| 37 | public: |
| 38 | explicit scoped_array(T* p = 0) : ptr_(p) {} |
| 39 | ~scoped_array() { |
| 40 | delete[] ptr_; |
| 41 | } |
| 42 | |
| 43 | void reset(T* p = 0) { |
| 44 | if (p != ptr_) { |
| 45 | delete[] ptr_; |
| 46 | ptr_ = p; |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | T& operator[](int i) const { |
| 51 | return ptr_[i]; |
| 52 | } |
| 53 | }; |
| 54 | |
| 55 | /////////////////////////////////////////////////////////////////////////////// |
| 56 | |
| 57 | namespace image_codec { |
| 58 | |
| 59 | class BmpDecoderCallback { |
| 60 | public: |
| 61 | BmpDecoderCallback() { } |
| 62 | virtual ~BmpDecoderCallback() {} |
| 63 | |
| 64 | /** |
| 65 | * This is called once for an image. It is passed the width and height and |
| 66 | * should return the address of a buffer that is large enough to store |
| 67 | * all of the resulting pixels (widht * height * 3 bytes). If it returns NULL, |
| 68 | * then the decoder will abort, but return true, as the caller has received |
| 69 | * valid dimensions. |
| 70 | */ |
| 71 | virtual uint8* SetSize(int width, int height) = 0; |
| 72 | |
| 73 | private: |
| 74 | DISALLOW_EVIL_CONSTRUCTORS(BmpDecoderCallback); |
| 75 | }; |
| 76 | |
| 77 | class BmpDecoderHelper { |
| 78 | public: |
| 79 | BmpDecoderHelper() { } |
| 80 | ~BmpDecoderHelper() { } |
| 81 | bool DecodeImage(const char* data, |
| 82 | int len, |
| 83 | int max_pixels, |
| 84 | BmpDecoderCallback* callback); |
| 85 | |
| 86 | private: |
| 87 | DISALLOW_EVIL_CONSTRUCTORS(BmpDecoderHelper); |
| 88 | |
| 89 | void DoRLEDecode(); |
| 90 | void DoStandardDecode(); |
| 91 | void PutPixel(int x, int y, uint8 col); |
| 92 | |
| 93 | int GetInt(); |
| 94 | int GetShort(); |
| 95 | uint8 GetByte(); |
| 96 | int CalcShiftRight(uint32 mask); |
| 97 | int CalcShiftLeft(uint32 mask); |
| 98 | |
| 99 | const uint8* data_; |
| 100 | int pos_; |
| 101 | int len_; |
| 102 | int width_; |
| 103 | int height_; |
| 104 | int bpp_; |
| 105 | int pixelPad_; |
| 106 | int rowPad_; |
| 107 | scoped_array<uint8> colTab_; |
| 108 | uint32 redBits_; |
| 109 | uint32 greenBits_; |
| 110 | uint32 blueBits_; |
| 111 | int redShiftRight_; |
| 112 | int greenShiftRight_; |
| 113 | int blueShiftRight_; |
| 114 | int redShiftLeft_; |
| 115 | int greenShiftLeft_; |
| 116 | int blueShiftLeft_; |
| 117 | uint8* output_; |
| 118 | bool inverted_; |
| 119 | }; |
| 120 | |
| 121 | } // namespace |
| 122 | |
| 123 | #endif |