1 // Copyright 2014 PDFium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
6
7 #include "core/fxcodec/codec/ccodec_gifmodule.h"
8
9 #include "core/fxcodec/codec/codec_int.h"
10 #include "core/fxcodec/fx_codec.h"
11 #include "core/fxcodec/gif/cfx_gif.h"
12 #include "core/fxcodec/gif/cfx_gifcontext.h"
13 #include "core/fxge/fx_dib.h"
14 #include "third_party/base/ptr_util.h"
15
CCodec_GifModule()16 CCodec_GifModule::CCodec_GifModule() {}
17
~CCodec_GifModule()18 CCodec_GifModule::~CCodec_GifModule() {}
19
Start(Delegate * pDelegate)20 std::unique_ptr<CCodec_GifModule::Context> CCodec_GifModule::Start(
21 Delegate* pDelegate) {
22 return pdfium::MakeUnique<CFX_GifContext>(this, pDelegate);
23 }
24
ReadHeader(Context * pContext,int * width,int * height,int * pal_num,void ** pal_pp,int * bg_index,CFX_DIBAttribute * pAttribute)25 CFX_GifDecodeStatus CCodec_GifModule::ReadHeader(Context* pContext,
26 int* width,
27 int* height,
28 int* pal_num,
29 void** pal_pp,
30 int* bg_index,
31 CFX_DIBAttribute* pAttribute) {
32 auto* context = static_cast<CFX_GifContext*>(pContext);
33 CFX_GifDecodeStatus ret = context->ReadHeader();
34 if (ret != CFX_GifDecodeStatus::Success)
35 return ret;
36
37 *width = context->width_;
38 *height = context->height_;
39 *pal_num = (2 << context->global_pal_exp_);
40 *pal_pp = context->global_palette_.empty() ? nullptr
41 : context->global_palette_.data();
42 *bg_index = context->bc_index_;
43 return CFX_GifDecodeStatus::Success;
44 }
45
LoadFrameInfo(Context * pContext)46 std::pair<CFX_GifDecodeStatus, size_t> CCodec_GifModule::LoadFrameInfo(
47 Context* pContext) {
48 auto* context = static_cast<CFX_GifContext*>(pContext);
49 CFX_GifDecodeStatus ret = context->GetFrame();
50 if (ret != CFX_GifDecodeStatus::Success)
51 return {ret, 0};
52 return {CFX_GifDecodeStatus::Success, context->GetFrameNum()};
53 }
54
LoadFrame(Context * pContext,size_t frame_num,CFX_DIBAttribute * pAttribute)55 CFX_GifDecodeStatus CCodec_GifModule::LoadFrame(Context* pContext,
56 size_t frame_num,
57 CFX_DIBAttribute* pAttribute) {
58 auto* context = static_cast<CFX_GifContext*>(pContext);
59 CFX_GifDecodeStatus ret = context->LoadFrame(frame_num);
60 if (ret != CFX_GifDecodeStatus::Success || !pAttribute)
61 return ret;
62
63 pAttribute->m_nGifLeft = context->images_[frame_num]->image_info.left;
64 pAttribute->m_nGifTop = context->images_[frame_num]->image_info.top;
65 pAttribute->m_fAspectRatio = context->pixel_aspect_;
66 const uint8_t* buf =
67 reinterpret_cast<const uint8_t*>(context->cmt_data_.GetBuffer(0));
68 uint32_t len = context->cmt_data_.GetLength();
69 if (len > 21) {
70 uint8_t size = *buf++;
71 if (size != 0)
72 pAttribute->m_strAuthor = ByteString(buf, size);
73 else
74 pAttribute->m_strAuthor.clear();
75 }
76 return CFX_GifDecodeStatus::Success;
77 }
78
GetAvailInput(Context * pContext,uint8_t ** avail_buf_ptr)79 uint32_t CCodec_GifModule::GetAvailInput(Context* pContext,
80 uint8_t** avail_buf_ptr) {
81 auto* context = static_cast<CFX_GifContext*>(pContext);
82 return context->GetAvailInput(avail_buf_ptr);
83 }
84
Input(Context * pContext,const uint8_t * src_buf,uint32_t src_size)85 void CCodec_GifModule::Input(Context* pContext,
86 const uint8_t* src_buf,
87 uint32_t src_size) {
88 auto* context = static_cast<CFX_GifContext*>(pContext);
89 context->SetInputBuffer((uint8_t*)src_buf, src_size);
90 }
91