// Copyright 2014 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "core/fxcodec/codec/codec_int.h"
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#include "core/fxcodec/include/fx_codec.h"
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#include "core/fxcodec/lgif/fx_gif.h"
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#include "core/fxge/include/fx_dib.h"
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struct FXGIF_Context {
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gif_decompress_struct_p gif_ptr;
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void* parent_ptr;
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void* child_ptr;
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void* (*m_AllocFunc)(unsigned int);
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void (*m_FreeFunc)(void*);
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};
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extern "C" {
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static void* gif_alloc_func(unsigned int size) {
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return FX_Alloc(char, size);
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}
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static void gif_free_func(void* p) {
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FX_Free(p);
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}
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};
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static void gif_error_data(gif_decompress_struct_p gif_ptr,
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const FX_CHAR* err_msg) {
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FXSYS_strncpy((char*)gif_ptr->err_ptr, err_msg, GIF_MAX_ERROR_SIZE - 1);
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longjmp(gif_ptr->jmpbuf, 1);
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}
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static uint8_t* gif_ask_buf_for_pal(gif_decompress_struct_p gif_ptr,
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int32_t pal_size) {
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FXGIF_Context* p = (FXGIF_Context*)gif_ptr->context_ptr;
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CCodec_GifModule* pModule = (CCodec_GifModule*)p->parent_ptr;
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return pModule->AskLocalPaletteBufCallback(
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p->child_ptr, gif_get_frame_num(gif_ptr), pal_size);
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}
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static void gif_record_current_position(gif_decompress_struct_p gif_ptr,
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uint32_t* cur_pos_ptr) {
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FXGIF_Context* p = (FXGIF_Context*)gif_ptr->context_ptr;
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CCodec_GifModule* pModule = (CCodec_GifModule*)p->parent_ptr;
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pModule->RecordCurrentPositionCallback(p->child_ptr, *cur_pos_ptr);
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}
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static void gif_read_scanline(gif_decompress_struct_p gif_ptr,
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int32_t row_num,
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uint8_t* row_buf) {
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FXGIF_Context* p = (FXGIF_Context*)gif_ptr->context_ptr;
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CCodec_GifModule* pModule = (CCodec_GifModule*)p->parent_ptr;
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pModule->ReadScanlineCallback(p->child_ptr, row_num, row_buf);
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}
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static FX_BOOL gif_get_record_position(gif_decompress_struct_p gif_ptr,
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uint32_t cur_pos,
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int32_t left,
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int32_t top,
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int32_t width,
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int32_t height,
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int32_t pal_num,
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void* pal_ptr,
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int32_t delay_time,
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FX_BOOL user_input,
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int32_t trans_index,
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int32_t disposal_method,
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FX_BOOL interlace) {
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FXGIF_Context* p = (FXGIF_Context*)gif_ptr->context_ptr;
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CCodec_GifModule* pModule = (CCodec_GifModule*)p->parent_ptr;
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return pModule->InputRecordPositionBufCallback(
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p->child_ptr, cur_pos, FX_RECT(left, top, left + width, top + height),
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pal_num, pal_ptr, delay_time, user_input, trans_index, disposal_method,
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interlace);
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}
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FXGIF_Context* CCodec_GifModule::Start(void* pModule) {
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FXGIF_Context* p = FX_Alloc(FXGIF_Context, 1);
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if (!p)
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return nullptr;
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FXSYS_memset(p, 0, sizeof(FXGIF_Context));
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p->m_AllocFunc = gif_alloc_func;
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p->m_FreeFunc = gif_free_func;
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p->gif_ptr = nullptr;
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p->parent_ptr = (void*)this;
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p->child_ptr = pModule;
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p->gif_ptr = gif_create_decompress();
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if (!p->gif_ptr) {
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FX_Free(p);
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return nullptr;
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}
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p->gif_ptr->context_ptr = (void*)p;
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p->gif_ptr->err_ptr = m_szLastError;
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p->gif_ptr->gif_error_fn = gif_error_data;
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p->gif_ptr->gif_ask_buf_for_pal_fn = gif_ask_buf_for_pal;
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p->gif_ptr->gif_record_current_position_fn = gif_record_current_position;
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p->gif_ptr->gif_get_row_fn = gif_read_scanline;
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p->gif_ptr->gif_get_record_position_fn = gif_get_record_position;
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return p;
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}
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void CCodec_GifModule::Finish(FXGIF_Context* ctx) {
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if (ctx) {
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gif_destroy_decompress(&ctx->gif_ptr);
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ctx->m_FreeFunc(ctx);
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}
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}
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int32_t CCodec_GifModule::ReadHeader(FXGIF_Context* ctx,
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int* width,
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int* height,
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int* pal_num,
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void** pal_pp,
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int* bg_index,
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CFX_DIBAttribute* pAttribute) {
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if (setjmp(ctx->gif_ptr->jmpbuf))
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return 0;
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int32_t ret = gif_read_header(ctx->gif_ptr);
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if (ret != 1)
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return ret;
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*width = ctx->gif_ptr->width;
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*height = ctx->gif_ptr->height;
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*pal_num = ctx->gif_ptr->global_pal_num;
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*pal_pp = ctx->gif_ptr->global_pal_ptr;
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*bg_index = ctx->gif_ptr->bc_index;
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return 1;
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}
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int32_t CCodec_GifModule::LoadFrameInfo(FXGIF_Context* ctx, int* frame_num) {
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if (setjmp(ctx->gif_ptr->jmpbuf))
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return 0;
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int32_t ret = gif_get_frame(ctx->gif_ptr);
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if (ret != 1)
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return ret;
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*frame_num = gif_get_frame_num(ctx->gif_ptr);
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return 1;
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}
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int32_t CCodec_GifModule::LoadFrame(FXGIF_Context* ctx,
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int frame_num,
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CFX_DIBAttribute* pAttribute) {
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if (setjmp(ctx->gif_ptr->jmpbuf))
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return 0;
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int32_t ret = gif_load_frame(ctx->gif_ptr, frame_num);
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if (ret == 1) {
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if (pAttribute) {
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pAttribute->m_nGifLeft =
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ctx->gif_ptr->img_ptr_arr_ptr->GetAt(frame_num)->image_info_ptr->left;
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pAttribute->m_nGifTop =
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ctx->gif_ptr->img_ptr_arr_ptr->GetAt(frame_num)->image_info_ptr->top;
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pAttribute->m_fAspectRatio = ctx->gif_ptr->pixel_aspect;
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if (ctx->gif_ptr->cmt_data_ptr) {
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const uint8_t* buf =
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(const uint8_t*)ctx->gif_ptr->cmt_data_ptr->GetBuffer(0);
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uint32_t len = ctx->gif_ptr->cmt_data_ptr->GetLength();
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if (len > 21) {
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uint8_t size = *buf++;
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if (size) {
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pAttribute->m_strAuthor = CFX_ByteString(buf, size);
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} else {
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pAttribute->m_strAuthor.clear();
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}
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buf += size;
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size = *buf++;
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if (size == 20) {
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FXSYS_memcpy(pAttribute->m_strTime, buf, size);
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}
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}
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}
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}
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}
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return ret;
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}
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uint32_t CCodec_GifModule::GetAvailInput(FXGIF_Context* ctx,
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uint8_t** avail_buf_ptr) {
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return gif_get_avail_input(ctx->gif_ptr, avail_buf_ptr);
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}
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void CCodec_GifModule::Input(FXGIF_Context* ctx,
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const uint8_t* src_buf,
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uint32_t src_size) {
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gif_input_buffer(ctx->gif_ptr, (uint8_t*)src_buf, src_size);
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}
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