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/gif/gif_decoder.h"
8
9 #include "core/fxcodec/cfx_codec_memory.h"
10 #include "core/fxcodec/fx_codec.h"
11 #include "core/fxcodec/gif/cfx_gifcontext.h"
12 #include "core/fxge/dib/fx_dib.h"
13
14 namespace fxcodec {
15
16 // static
StartDecode(Delegate * pDelegate)17 std::unique_ptr<ProgressiveDecoderIface::Context> GifDecoder::StartDecode(
18 Delegate* pDelegate) {
19 return std::make_unique<CFX_GifContext>(pDelegate);
20 }
21
22 // static
ReadHeader(ProgressiveDecoderIface::Context * pContext,int * width,int * height,int * pal_num,CFX_GifPalette ** pal_pp,int * bg_index)23 CFX_GifDecodeStatus GifDecoder::ReadHeader(
24 ProgressiveDecoderIface::Context* pContext,
25 int* width,
26 int* height,
27 int* pal_num,
28 CFX_GifPalette** pal_pp,
29 int* bg_index) {
30 auto* context = static_cast<CFX_GifContext*>(pContext);
31 CFX_GifDecodeStatus ret = context->ReadHeader();
32 if (ret != CFX_GifDecodeStatus::Success)
33 return ret;
34
35 *width = context->width_;
36 *height = context->height_;
37 *pal_num = (2 << context->global_palette_exp_);
38 *pal_pp = context->global_palette_.empty() ? nullptr
39 : context->global_palette_.data();
40 *bg_index = context->bc_index_;
41 return CFX_GifDecodeStatus::Success;
42 }
43
44 // static
LoadFrameInfo(ProgressiveDecoderIface::Context * pContext)45 std::pair<CFX_GifDecodeStatus, size_t> GifDecoder::LoadFrameInfo(
46 ProgressiveDecoderIface::Context* pContext) {
47 auto* context = static_cast<CFX_GifContext*>(pContext);
48 CFX_GifDecodeStatus ret = context->GetFrame();
49 if (ret != CFX_GifDecodeStatus::Success)
50 return {ret, 0};
51 return {CFX_GifDecodeStatus::Success, context->GetFrameNum()};
52 }
53
54 // static
LoadFrame(ProgressiveDecoderIface::Context * pContext,size_t frame_num)55 CFX_GifDecodeStatus GifDecoder::LoadFrame(
56 ProgressiveDecoderIface::Context* pContext,
57 size_t frame_num) {
58 return static_cast<CFX_GifContext*>(pContext)->LoadFrame(frame_num);
59 }
60
61 // static
GetAvailInput(ProgressiveDecoderIface::Context * pContext)62 FX_FILESIZE GifDecoder::GetAvailInput(
63 ProgressiveDecoderIface::Context* pContext) {
64 return static_cast<CFX_GifContext*>(pContext)->GetAvailInput();
65 }
66
67 // static
Input(ProgressiveDecoderIface::Context * pContext,RetainPtr<CFX_CodecMemory> codec_memory,CFX_DIBAttribute *)68 bool GifDecoder::Input(ProgressiveDecoderIface::Context* pContext,
69 RetainPtr<CFX_CodecMemory> codec_memory,
70 CFX_DIBAttribute*) {
71 auto* ctx = static_cast<CFX_GifContext*>(pContext);
72 ctx->SetInputBuffer(std::move(codec_memory));
73 return true;
74 }
75
76 } // namespace fxcodec
77