1 // Copyright 2017 PDFium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com 6 7 #ifndef CORE_FXCODEC_GIF_CFX_GIFCONTEXT_H_ 8 #define CORE_FXCODEC_GIF_CFX_GIFCONTEXT_H_ 9 10 #include <memory> 11 #include <vector> 12 13 #include "core/fxcodec/codec/ccodec_gifmodule.h" 14 #include "core/fxcodec/gif/cfx_gif.h" 15 #include "core/fxcodec/gif/cfx_lzwdecompressor.h" 16 #include "core/fxcrt/fx_string.h" 17 #include "core/fxcrt/unowned_ptr.h" 18 19 class CFX_GifContext : public CCodec_GifModule::Context { 20 public: 21 CFX_GifContext(CCodec_GifModule* gif_module, 22 CCodec_GifModule::Delegate* delegate); 23 ~CFX_GifContext() override; 24 25 void RecordCurrentPosition(uint32_t* cur_pos); 26 void ReadScanline(int32_t row_num, uint8_t* row_buf); 27 bool GetRecordPosition(uint32_t cur_pos, 28 int32_t left, 29 int32_t top, 30 int32_t width, 31 int32_t height, 32 int32_t pal_num, 33 CFX_GifPalette* pal, 34 int32_t delay_time, 35 bool user_input, 36 int32_t trans_index, 37 int32_t disposal_method, 38 bool interlace); 39 CFX_GifDecodeStatus ReadHeader(); 40 CFX_GifDecodeStatus GetFrame(); 41 CFX_GifDecodeStatus LoadFrame(int32_t frame_num); 42 void SetInputBuffer(uint8_t* src_buf, uint32_t src_size); 43 uint32_t GetAvailInput(uint8_t** avail_buf) const; 44 size_t GetFrameNum() const { return images_.size(); } 45 46 UnownedPtr<CCodec_GifModule> gif_module_; 47 UnownedPtr<CCodec_GifModule::Delegate> delegate_; 48 std::vector<CFX_GifPalette> global_palette_; 49 uint8_t global_pal_exp_; 50 uint32_t img_row_offset_; 51 uint32_t img_row_avail_size_; 52 uint32_t avail_in_; 53 int32_t decode_status_; 54 uint32_t skip_size_; 55 ByteString cmt_data_; 56 std::unique_ptr<CFX_GifGraphicControlExtension> graphic_control_extension_; 57 uint8_t* next_in_; 58 std::vector<std::unique_ptr<CFX_GifImage>> images_; 59 std::unique_ptr<CFX_LZWDecompressor> lzw_decompressor_; 60 int width_; 61 int height_; 62 uint8_t bc_index_; 63 uint8_t pixel_aspect_; 64 uint8_t global_sort_flag_; 65 uint8_t global_color_resolution_; 66 uint8_t img_pass_num_; 67 68 protected: 69 uint8_t* ReadData(uint8_t** des_buf_pp, uint32_t data_size); 70 CFX_GifDecodeStatus ReadGifSignature(); 71 CFX_GifDecodeStatus ReadLogicalScreenDescriptor(); 72 73 private: 74 void SaveDecodingStatus(int32_t status); 75 CFX_GifDecodeStatus DecodeExtension(); 76 CFX_GifDecodeStatus DecodeImageInfo(); 77 void DecodingFailureAtTailCleanup(CFX_GifImage* gif_image); 78 }; 79 80 #endif // CORE_FXCODEC_GIF_CFX_GIFCONTEXT_H_ 81
