core/fxcodec/lgif/cgifdecompressor.cpp

// Copyright 2017 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#include "core/fxcodec/lgif/cgifdecompressor.h"

#include <utility>

#include "core/fxcodec/codec/ccodec_gifmodule.h"
#include "core/fxcodec/lgif/fx_gif.h"
#include "third_party/base/ptr_util.h"
#include "third_party/base/stl_util.h"

FXGIF_Context::FXGIF_Context() {}

FXGIF_Context::~FXGIF_Context() {}

CGifDecompressor::CGifDecompressor(FXGIF_Context* p, char* error_string)
    : global_pal_num(0),
      img_row_offset(0),
      img_row_avail_size(0),
      avail_in(0),
      decode_status(GIF_D_STATUS_SIG),
      skip_size(0),
      err_ptr(error_string),
      gif_context(p),
      next_in(nullptr),
      width(0),
      height(0),
      bc_index(0),
      pixel_aspect(0),
      global_sort_flag(0),
      global_color_resolution(0),
      img_pass_num(0) {}

CGifDecompressor::~CGifDecompressor() {}

void CGifDecompressor::ErrorData(const char* err_msg) {
  strncpy(err_ptr, err_msg, GIF_MAX_ERROR_SIZE - 1);
  longjmp(jmpbuf, 1);
}

void CGifDecompressor::RecordCurrentPosition(uint32_t* cur_pos_ptr) {
  gif_context->parent_ptr->GetDelegate()->GifRecordCurrentPosition(
      *cur_pos_ptr);
}

void CGifDecompressor::ReadScanline(int32_t row_num, uint8_t* row_buf) {
  gif_context->parent_ptr->GetDelegate()->GifReadScanline(row_num, row_buf);
}

bool CGifDecompressor::GetRecordPosition(uint32_t cur_pos,
                                         int32_t left,
                                         int32_t top,
                                         int32_t width,
                                         int32_t height,
                                         int32_t pal_num,
                                         GifPalette* pal_ptr,
                                         int32_t delay_time,
                                         bool user_input,
                                         int32_t trans_index,
                                         int32_t disposal_method,
                                         bool interlace) {
  return gif_context->parent_ptr->GetDelegate()->GifInputRecordPositionBuf(
      cur_pos, FX_RECT(left, top, left + width, top + height), pal_num, pal_ptr,
      delay_time, user_input, trans_index, disposal_method, interlace);
}