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0a26adce08
Change-Id: I655e0890f3d1df7df96ca949ed3e588f7c25b9d2 Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/130711 Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Tom Sepez <tsepez@chromium.org>
75 lines
1.9 KiB
C++
75 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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: orig_width_(nOrigWidth),
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orig_height_(nOrigHeight),
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output_width_(nOutputWidth),
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output_height_(nOutputHeight),
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comps_(nComps),
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bpc_(nBpc),
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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 (next_line_ == line + 1) {
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return last_scanline_;
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}
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if (next_line_ < 0 || next_line_ > line) {
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if (!Rewind()) {
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return pdfium::span<const uint8_t>();
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}
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next_line_ = 0;
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}
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while (next_line_ < line) {
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GetNextLine();
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next_line_++;
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}
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last_scanline_ = GetNextLine();
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next_line_++;
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return last_scanline_;
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}
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bool ScanlineDecoder::SkipToScanline(int line, PauseIndicatorIface* pPause) {
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if (next_line_ == line || next_line_ == line + 1) {
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return false;
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}
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if (next_line_ < 0 || next_line_ > line) {
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if (!Rewind()) {
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return false;
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}
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next_line_ = 0;
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}
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last_scanline_ = pdfium::span<uint8_t>();
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while (next_line_ < line) {
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last_scanline_ = GetNextLine();
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next_line_++;
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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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