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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/cgifcontext.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() {}
CCodec_GifModule::~CCodec_GifModule() {}
std::unique_ptr<CCodec_GifModule::Context> CCodec_GifModule::Start(
Delegate* pDelegate) {
return pdfium::MakeUnique<CGifContext>(this, pDelegate);
}
GifDecodeStatus CCodec_GifModule::ReadHeader(Context* pContext,
int* width,
int* height,
int* pal_num,
void** pal_pp,
int* bg_index,
CFX_DIBAttribute* pAttribute) {
auto* context = static_cast<CGifContext*>(pContext);
GifDecodeStatus ret = gif_read_header(context);
if (ret != GifDecodeStatus::Success)
return ret;
*width = context->width;
*height = context->height;
*pal_num = (2 << context->global_pal_exp);
*pal_pp = context->m_GlobalPalette.empty() ? nullptr
: context->m_GlobalPalette.data();
*bg_index = context->bc_index;
return GifDecodeStatus::Success;
}
GifDecodeStatus CCodec_GifModule::LoadFrameInfo(Context* pContext,
int* frame_num) {
auto* context = static_cast<CGifContext*>(pContext);
GifDecodeStatus ret = gif_get_frame(context);
if (ret != GifDecodeStatus::Success)
return ret;
*frame_num = gif_get_frame_num(context);
return GifDecodeStatus::Success;
}
GifDecodeStatus CCodec_GifModule::LoadFrame(Context* pContext,
int frame_num,
CFX_DIBAttribute* pAttribute) {
auto* context = static_cast<CGifContext*>(pContext);
GifDecodeStatus ret = gif_load_frame(context, frame_num);
if (ret != GifDecodeStatus::Success || !pAttribute)
return ret;
pAttribute->m_nGifLeft = context->m_Images[frame_num]->m_ImageInfo.left;
pAttribute->m_nGifTop = context->m_Images[frame_num]->m_ImageInfo.top;
pAttribute->m_fAspectRatio = context->pixel_aspect;
const uint8_t* buf =
reinterpret_cast<const uint8_t*>(context->cmt_data.GetBuffer(0));
uint32_t len = context->cmt_data.GetLength();
if (len > 21) {
uint8_t size = *buf++;
if (size != 0)
pAttribute->m_strAuthor = ByteString(buf, size);
else
pAttribute->m_strAuthor.clear();
}
return GifDecodeStatus::Success;
}
uint32_t CCodec_GifModule::GetAvailInput(Context* pContext,
uint8_t** avail_buf_ptr) {
auto* context = static_cast<CGifContext*>(pContext);
return gif_get_avail_input(context, avail_buf_ptr);
}
void CCodec_GifModule::Input(Context* pContext,
const uint8_t* src_buf,
uint32_t src_size) {
auto* context = static_cast<CGifContext*>(pContext);
gif_input_buffer(context, (uint8_t*)src_buf, src_size);
}
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