| // Copyright 2014 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/codec/ccodec_gifmodule.h" |
| |
| #include "core/fxcodec/codec/codec_int.h" |
| #include "core/fxcodec/fx_codec.h" |
| #include "core/fxcodec/lgif/fx_gif.h" |
| #include "core/fxge/fx_dib.h" |
| |
| struct FXGIF_Context { |
| gif_decompress_struct_p gif_ptr; |
| void* parent_ptr; |
| |
| void* (*m_AllocFunc)(unsigned int); |
| void (*m_FreeFunc)(void*); |
| }; |
| |
| extern "C" { |
| static void* gif_alloc_func(unsigned int size) { |
| return FX_Alloc(char, size); |
| } |
| static void gif_free_func(void* p) { |
| FX_Free(p); |
| } |
| }; |
| |
| static void gif_error_data(gif_decompress_struct_p gif_ptr, |
| const char* err_msg) { |
| strncpy((char*)gif_ptr->err_ptr, err_msg, GIF_MAX_ERROR_SIZE - 1); |
| longjmp(gif_ptr->jmpbuf, 1); |
| } |
| |
| static uint8_t* gif_ask_buf_for_pal(gif_decompress_struct_p gif_ptr, |
| int32_t pal_size) { |
| FXGIF_Context* p = (FXGIF_Context*)gif_ptr->context_ptr; |
| CCodec_GifModule* pModule = (CCodec_GifModule*)p->parent_ptr; |
| return pModule->GetDelegate()->GifAskLocalPaletteBuf( |
| gif_get_frame_num(gif_ptr), pal_size); |
| } |
| |
| static void gif_record_current_position(gif_decompress_struct_p gif_ptr, |
| uint32_t* cur_pos_ptr) { |
| FXGIF_Context* p = (FXGIF_Context*)gif_ptr->context_ptr; |
| CCodec_GifModule* pModule = (CCodec_GifModule*)p->parent_ptr; |
| pModule->GetDelegate()->GifRecordCurrentPosition(*cur_pos_ptr); |
| } |
| |
| static void gif_read_scanline(gif_decompress_struct_p gif_ptr, |
| int32_t row_num, |
| uint8_t* row_buf) { |
| FXGIF_Context* p = (FXGIF_Context*)gif_ptr->context_ptr; |
| CCodec_GifModule* pModule = (CCodec_GifModule*)p->parent_ptr; |
| pModule->GetDelegate()->GifReadScanline(row_num, row_buf); |
| } |
| |
| static bool gif_get_record_position(gif_decompress_struct_p gif_ptr, |
| uint32_t cur_pos, |
| int32_t left, |
| int32_t top, |
| int32_t width, |
| int32_t height, |
| int32_t pal_num, |
| void* pal_ptr, |
| int32_t delay_time, |
| bool user_input, |
| int32_t trans_index, |
| int32_t disposal_method, |
| bool interlace) { |
| FXGIF_Context* p = (FXGIF_Context*)gif_ptr->context_ptr; |
| CCodec_GifModule* pModule = (CCodec_GifModule*)p->parent_ptr; |
| return pModule->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); |
| } |
| |
| CCodec_GifModule::CCodec_GifModule() { |
| memset(m_szLastError, 0, sizeof(m_szLastError)); |
| } |
| |
| CCodec_GifModule::~CCodec_GifModule() {} |
| |
| FXGIF_Context* CCodec_GifModule::Start() { |
| FXGIF_Context* p = FX_Alloc(FXGIF_Context, 1); |
| if (!p) |
| return nullptr; |
| |
| memset(p, 0, sizeof(FXGIF_Context)); |
| p->m_AllocFunc = gif_alloc_func; |
| p->m_FreeFunc = gif_free_func; |
| p->gif_ptr = nullptr; |
| p->parent_ptr = this; |
| p->gif_ptr = gif_create_decompress(); |
| if (!p->gif_ptr) { |
| FX_Free(p); |
| return nullptr; |
| } |
| p->gif_ptr->context_ptr = p; |
| p->gif_ptr->err_ptr = m_szLastError; |
| p->gif_ptr->gif_error_fn = gif_error_data; |
| p->gif_ptr->gif_ask_buf_for_pal_fn = gif_ask_buf_for_pal; |
| p->gif_ptr->gif_record_current_position_fn = gif_record_current_position; |
| p->gif_ptr->gif_get_row_fn = gif_read_scanline; |
| p->gif_ptr->gif_get_record_position_fn = gif_get_record_position; |
| return p; |
| } |
| |
| void CCodec_GifModule::Finish(FXGIF_Context* ctx) { |
| if (ctx) { |
| gif_destroy_decompress(&ctx->gif_ptr); |
| ctx->m_FreeFunc(ctx); |
| } |
| } |
| |
| int32_t CCodec_GifModule::ReadHeader(FXGIF_Context* ctx, |
| int* width, |
| int* height, |
| int* pal_num, |
| void** pal_pp, |
| int* bg_index, |
| CFX_DIBAttribute* pAttribute) { |
| if (setjmp(ctx->gif_ptr->jmpbuf)) |
| return 0; |
| |
| int32_t ret = gif_read_header(ctx->gif_ptr); |
| if (ret != 1) |
| return ret; |
| |
| *width = ctx->gif_ptr->width; |
| *height = ctx->gif_ptr->height; |
| *pal_num = ctx->gif_ptr->global_pal_num; |
| *pal_pp = ctx->gif_ptr->global_pal_ptr; |
| *bg_index = ctx->gif_ptr->bc_index; |
| return 1; |
| } |
| |
| int32_t CCodec_GifModule::LoadFrameInfo(FXGIF_Context* ctx, int* frame_num) { |
| if (setjmp(ctx->gif_ptr->jmpbuf)) |
| return 0; |
| |
| int32_t ret = gif_get_frame(ctx->gif_ptr); |
| if (ret != 1) |
| return ret; |
| |
| *frame_num = gif_get_frame_num(ctx->gif_ptr); |
| return 1; |
| } |
| |
| int32_t CCodec_GifModule::LoadFrame(FXGIF_Context* ctx, |
| int frame_num, |
| CFX_DIBAttribute* pAttribute) { |
| if (setjmp(ctx->gif_ptr->jmpbuf)) |
| return 0; |
| |
| int32_t ret = gif_load_frame(ctx->gif_ptr, frame_num); |
| if (ret == 1) { |
| if (pAttribute) { |
| pAttribute->m_nGifLeft = |
| (*ctx->gif_ptr->img_ptr_arr_ptr)[frame_num]->image_info_ptr->left; |
| pAttribute->m_nGifTop = |
| (*ctx->gif_ptr->img_ptr_arr_ptr)[frame_num]->image_info_ptr->top; |
| pAttribute->m_fAspectRatio = ctx->gif_ptr->pixel_aspect; |
| if (ctx->gif_ptr->cmt_data_ptr) { |
| const uint8_t* buf = |
| (const uint8_t*)ctx->gif_ptr->cmt_data_ptr->GetBuffer(0); |
| uint32_t len = ctx->gif_ptr->cmt_data_ptr->GetLength(); |
| if (len > 21) { |
| uint8_t size = *buf++; |
| if (size) { |
| pAttribute->m_strAuthor = CFX_ByteString(buf, size); |
| } else { |
| pAttribute->m_strAuthor.clear(); |
| } |
| buf += size; |
| size = *buf++; |
| if (size == 20) { |
| memcpy(pAttribute->m_strTime, buf, size); |
| } |
| } |
| } |
| } |
| } |
| return ret; |
| } |
| |
| uint32_t CCodec_GifModule::GetAvailInput(FXGIF_Context* ctx, |
| uint8_t** avail_buf_ptr) { |
| return gif_get_avail_input(ctx->gif_ptr, avail_buf_ptr); |
| } |
| |
| void CCodec_GifModule::Input(FXGIF_Context* ctx, |
| const uint8_t* src_buf, |
| uint32_t src_size) { |
| gif_input_buffer(ctx->gif_ptr, (uint8_t*)src_buf, src_size); |
| } |