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// 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();
}
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