1 // Copyright 2016 The PDFium Authors 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_GIF_DECODER_H_ 8 #define CORE_FXCODEC_GIF_GIF_DECODER_H_ 9 10 #include <memory> 11 #include <utility> 12 13 #include "core/fxcodec/gif/cfx_gif.h" 14 #include "core/fxcodec/progressive_decoder_iface.h" 15 #include "core/fxcrt/fx_coordinates.h" 16 #include "core/fxcrt/span.h" 17 18 #ifndef PDF_ENABLE_XFA_GIF 19 #error "GIF must be enabled" 20 #endif 21 22 namespace fxcodec { 23 24 class GifDecoder { 25 public: 26 enum class Status { 27 kError, 28 kSuccess, 29 kUnfinished, 30 }; 31 32 class Delegate { 33 public: 34 virtual uint32_t GifCurrentPosition() const = 0; 35 virtual bool GifInputRecordPositionBuf(uint32_t rcd_pos, 36 const FX_RECT& img_rc, 37 pdfium::span<CFX_GifPalette> pal_ptr, 38 int32_t trans_index, 39 bool interlace) = 0; 40 virtual void GifReadScanline(int32_t row_num, 41 pdfium::span<uint8_t> row_buf) = 0; 42 }; 43 44 static std::unique_ptr<ProgressiveDecoderIface::Context> StartDecode( 45 Delegate* pDelegate); 46 static Status ReadHeader(ProgressiveDecoderIface::Context* context, 47 int* width, 48 int* height, 49 pdfium::span<CFX_GifPalette>* pal_pp, 50 int* bg_index); 51 static std::pair<Status, size_t> LoadFrameInfo( 52 ProgressiveDecoderIface::Context* context); 53 static Status LoadFrame(ProgressiveDecoderIface::Context* context, 54 size_t frame_num); 55 static FX_FILESIZE GetAvailInput(ProgressiveDecoderIface::Context* context); 56 static bool Input(ProgressiveDecoderIface::Context* context, 57 RetainPtr<CFX_CodecMemory> codec_memory); 58 59 GifDecoder() = delete; 60 GifDecoder(const GifDecoder&) = delete; 61 GifDecoder& operator=(const GifDecoder&) = delete; 62 }; 63 64 } // namespace fxcodec 65 66 using GifDecoder = fxcodec::GifDecoder; 67 68 #endif // CORE_FXCODEC_GIF_GIF_DECODER_H_ 69