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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/ccodec_gifmodule.h"
#include "core/fxcodec/codec/codec_int.h"
#include "core/fxcodec/fx_codec.h"
#include "core/fxcodec/lgif/cgifdecompressor.h"
#include "core/fxcodec/lgif/fx_gif.h"
#include "core/fxge/fx_dib.h"
#include "third_party/base/ptr_util.h"
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->parent_ptr = this;
p->m_Gif = pdfium::MakeUnique<CGifDecompressor>(p, m_szLastError);
return p;
}
void CCodec_GifModule::Finish(FXGIF_Context* ctx) {
if (ctx) {
ctx->m_Gif = nullptr;
FX_Free(ctx);
}
}
GifDecodeStatus 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->m_Gif->jmpbuf))
return GifDecodeStatus::Error;
GifDecodeStatus ret = gif_read_header(ctx->m_Gif.get());
if (ret != GifDecodeStatus::Success)
return ret;
*width = ctx->m_Gif->width;
*height = ctx->m_Gif->height;
*pal_num = ctx->m_Gif->global_pal_num;
*pal_pp = ctx->m_Gif->m_GlobalPalette.empty()
? nullptr
: ctx->m_Gif->m_GlobalPalette.data();
*bg_index = ctx->m_Gif->bc_index;
return GifDecodeStatus::Success;
}
GifDecodeStatus CCodec_GifModule::LoadFrameInfo(FXGIF_Context* ctx,
int* frame_num) {
if (setjmp(ctx->m_Gif->jmpbuf))
return GifDecodeStatus::Error;
GifDecodeStatus ret = gif_get_frame(ctx->m_Gif.get());
if (ret != GifDecodeStatus::Success)
return ret;
*frame_num = gif_get_frame_num(ctx->m_Gif.get());
return GifDecodeStatus::Success;
}
GifDecodeStatus CCodec_GifModule::LoadFrame(FXGIF_Context* ctx,
int frame_num,
CFX_DIBAttribute* pAttribute) {
if (setjmp(ctx->m_Gif->jmpbuf))
return GifDecodeStatus::Error;
GifDecodeStatus ret = gif_load_frame(ctx->m_Gif.get(), frame_num);
if (ret == GifDecodeStatus::Success) {
if (pAttribute) {
pAttribute->m_nGifLeft =
ctx->m_Gif->m_Images[frame_num]->m_ImageInfo.left;
pAttribute->m_nGifTop = ctx->m_Gif->m_Images[frame_num]->m_ImageInfo.top;
pAttribute->m_fAspectRatio = ctx->m_Gif->pixel_aspect;
const uint8_t* buf =
reinterpret_cast<const uint8_t*>(ctx->m_Gif->cmt_data.GetBuffer(0));
uint32_t len = ctx->m_Gif->cmt_data.GetLength();
if (len > 21) {
uint8_t size = *buf++;
if (size != 0)
pAttribute->m_strAuthor = CFX_ByteString(buf, size);
else
pAttribute->m_strAuthor.clear();
}
}
}
return ret;
}
uint32_t CCodec_GifModule::GetAvailInput(FXGIF_Context* ctx,
uint8_t** avail_buf_ptr) {
return gif_get_avail_input(ctx->m_Gif.get(), avail_buf_ptr);
}
void CCodec_GifModule::Input(FXGIF_Context* ctx,
const uint8_t* src_buf,
uint32_t src_size) {
gif_input_buffer(ctx->m_Gif.get(), (uint8_t*)src_buf, src_size);
}
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