| // Copyright 2017 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_scanlinedecoder.h" |
| |
| #include "core/fxcrt/pauseindicator_iface.h" |
| |
| CCodec_ScanlineDecoder::CCodec_ScanlineDecoder() |
| : CCodec_ScanlineDecoder(0, 0, 0, 0, 0, 0, 0) {} |
| |
| CCodec_ScanlineDecoder::CCodec_ScanlineDecoder(int nOrigWidth, |
| int nOrigHeight, |
| int nOutputWidth, |
| int nOutputHeight, |
| int nComps, |
| int nBpc, |
| uint32_t nPitch) |
| : m_OrigWidth(nOrigWidth), |
| m_OrigHeight(nOrigHeight), |
| m_OutputWidth(nOutputWidth), |
| m_OutputHeight(nOutputHeight), |
| m_nComps(nComps), |
| m_bpc(nBpc), |
| m_Pitch(nPitch), |
| m_NextLine(-1), |
| m_pLastScanline(nullptr) {} |
| |
| CCodec_ScanlineDecoder::~CCodec_ScanlineDecoder() {} |
| |
| const uint8_t* CCodec_ScanlineDecoder::GetScanline(int line) { |
| if (m_NextLine == line + 1) |
| return m_pLastScanline; |
| |
| if (m_NextLine < 0 || m_NextLine > line) { |
| if (!v_Rewind()) |
| return nullptr; |
| m_NextLine = 0; |
| } |
| while (m_NextLine < line) { |
| ReadNextLine(); |
| m_NextLine++; |
| } |
| m_pLastScanline = ReadNextLine(); |
| m_NextLine++; |
| return m_pLastScanline; |
| } |
| |
| bool CCodec_ScanlineDecoder::SkipToScanline(int line, |
| PauseIndicatorIface* pPause) { |
| if (m_NextLine == line || m_NextLine == line + 1) |
| return false; |
| |
| if (m_NextLine < 0 || m_NextLine > line) { |
| v_Rewind(); |
| m_NextLine = 0; |
| } |
| m_pLastScanline = nullptr; |
| while (m_NextLine < line) { |
| m_pLastScanline = ReadNextLine(); |
| m_NextLine++; |
| if (pPause && pPause->NeedToPauseNow()) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| uint8_t* CCodec_ScanlineDecoder::ReadNextLine() { |
| return v_GetNextLine(); |
| } |