| // 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/gif/gif_decoder.h" |
| |
| #include "core/fxcodec/cfx_codec_memory.h" |
| #include "core/fxcodec/fx_codec.h" |
| #include "core/fxcodec/gif/cfx_gifcontext.h" |
| #include "core/fxge/dib/fx_dib.h" |
| |
| namespace fxcodec { |
| |
| // static |
| std::unique_ptr<ProgressiveDecoderIface::Context> GifDecoder::StartDecode( |
| Delegate* pDelegate) { |
| return std::make_unique<CFX_GifContext>(pDelegate); |
| } |
| |
| // static |
| GifDecoder::Status GifDecoder::ReadHeader( |
| ProgressiveDecoderIface::Context* pContext, |
| int* width, |
| int* height, |
| int* pal_num, |
| CFX_GifPalette** pal_pp, |
| int* bg_index) { |
| auto* context = static_cast<CFX_GifContext*>(pContext); |
| Status ret = context->ReadHeader(); |
| if (ret != Status::kSuccess) |
| return ret; |
| |
| *width = context->width_; |
| *height = context->height_; |
| *pal_num = (2 << context->global_palette_exp_); |
| *pal_pp = context->global_palette_.empty() ? nullptr |
| : context->global_palette_.data(); |
| *bg_index = context->bc_index_; |
| return Status::kSuccess; |
| } |
| |
| // static |
| std::pair<GifDecoder::Status, size_t> GifDecoder::LoadFrameInfo( |
| ProgressiveDecoderIface::Context* pContext) { |
| auto* context = static_cast<CFX_GifContext*>(pContext); |
| Status ret = context->GetFrame(); |
| if (ret != Status::kSuccess) |
| return {ret, 0}; |
| return {Status::kSuccess, context->GetFrameNum()}; |
| } |
| |
| // static |
| GifDecoder::Status GifDecoder::LoadFrame( |
| ProgressiveDecoderIface::Context* pContext, |
| size_t frame_num) { |
| return static_cast<CFX_GifContext*>(pContext)->LoadFrame(frame_num); |
| } |
| |
| // static |
| FX_FILESIZE GifDecoder::GetAvailInput( |
| ProgressiveDecoderIface::Context* pContext) { |
| return static_cast<CFX_GifContext*>(pContext)->GetAvailInput(); |
| } |
| |
| // static |
| bool GifDecoder::Input(ProgressiveDecoderIface::Context* pContext, |
| RetainPtr<CFX_CodecMemory> codec_memory, |
| CFX_DIBAttribute*) { |
| auto* ctx = static_cast<CFX_GifContext*>(pContext); |
| ctx->SetInputBuffer(std::move(codec_memory)); |
| return true; |
| } |
| |
| } // namespace fxcodec |