hmz007
36ed224bac
Signed-off-by: hmz007 <hmz007@gmail.com> Change-Id: Ib87fdbe7a0be7dc961af3500fe9ea4589a127f9f
70 lines
1.9 KiB
C++
70 lines
1.9 KiB
C++
// Copyright 2017 The PDFium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "core/fxcodec/scanlinedecoder.h"
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#include "core/fxcrt/pauseindicator_iface.h"
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namespace fxcodec {
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ScanlineDecoder::ScanlineDecoder() : ScanlineDecoder(0, 0, 0, 0, 0, 0, 0) {}
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ScanlineDecoder::ScanlineDecoder(int nOrigWidth,
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int nOrigHeight,
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int nOutputWidth,
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int nOutputHeight,
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int nComps,
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int nBpc,
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uint32_t nPitch)
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: m_OrigWidth(nOrigWidth),
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m_OrigHeight(nOrigHeight),
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m_OutputWidth(nOutputWidth),
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m_OutputHeight(nOutputHeight),
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m_nComps(nComps),
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m_bpc(nBpc),
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m_Pitch(nPitch) {}
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ScanlineDecoder::~ScanlineDecoder() = default;
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pdfium::span<const uint8_t> ScanlineDecoder::GetScanline(int line) {
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if (m_NextLine == line + 1)
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return m_pLastScanline;
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if (m_NextLine < 0 || m_NextLine > line) {
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if (!Rewind())
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return pdfium::span<const uint8_t>();
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m_NextLine = 0;
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}
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while (m_NextLine < line) {
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GetNextLine();
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m_NextLine++;
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}
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m_pLastScanline = GetNextLine();
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m_NextLine++;
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return m_pLastScanline;
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}
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bool ScanlineDecoder::SkipToScanline(int line, PauseIndicatorIface* pPause) {
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if (m_NextLine == line || m_NextLine == line + 1)
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return false;
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if (m_NextLine < 0 || m_NextLine > line) {
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Rewind();
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m_NextLine = 0;
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}
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m_pLastScanline = pdfium::span<uint8_t>();
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while (m_NextLine < line) {
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m_pLastScanline = GetNextLine();
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m_NextLine++;
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if (pPause && pPause->NeedToPauseNow()) {
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return true;
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}
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}
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return false;
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}
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} // namespace fxcodec
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