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// 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/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* child_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 FX_CHAR* err_msg) {
FXSYS_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->AskLocalPaletteBufCallback(
p->child_ptr, 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->RecordCurrentPositionCallback(p->child_ptr, *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->ReadScanlineCallback(p->child_ptr, 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->InputRecordPositionBufCallback(
p->child_ptr, cur_pos, FX_RECT(left, top, left + width, top + height),
pal_num, pal_ptr, delay_time, user_input, trans_index, disposal_method,
interlace);
}
FXGIF_Context* CCodec_GifModule::Start(void* pModule) {
FXGIF_Context* p = FX_Alloc(FXGIF_Context, 1);
if (!p)
return nullptr;
FXSYS_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 = (void*)this;
p->child_ptr = pModule;
p->gif_ptr = gif_create_decompress();
if (!p->gif_ptr) {
FX_Free(p);
return nullptr;
}
p->gif_ptr->context_ptr = (void*)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->GetAt(frame_num)->image_info_ptr->left;
pAttribute->m_nGifTop =
ctx->gif_ptr->img_ptr_arr_ptr->GetAt(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) {
FXSYS_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);
}
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