mirror of https://github.com/opencv/opencv.git
Open Source Computer Vision Library
https://opencv.org/
1021 lines
27 KiB
1021 lines
27 KiB
/////////////////////////////////////////////////////////////////////////// |
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// |
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// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas |
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// Digital Ltd. LLC |
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// |
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// All rights reserved. |
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// |
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// Redistribution and use in source and binary forms, with or without |
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// modification, are permitted provided that the following conditions are |
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// met: |
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// * Redistributions of source code must retain the above copyright |
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// notice, this list of conditions and the following disclaimer. |
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// * Redistributions in binary form must reproduce the above |
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// copyright notice, this list of conditions and the following disclaimer |
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// in the documentation and/or other materials provided with the |
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// distribution. |
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// * Neither the name of Industrial Light & Magic nor the names of |
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// its contributors may be used to endorse or promote products derived |
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// from this software without specific prior written permission. |
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// |
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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// |
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/////////////////////////////////////////////////////////////////////////// |
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//----------------------------------------------------------------------------- |
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// |
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// class ScanLineInputFile |
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// |
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//----------------------------------------------------------------------------- |
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#include <ImfScanLineInputFile.h> |
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#include <ImfChannelList.h> |
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#include <ImfMisc.h> |
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#include <ImfStdIO.h> |
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#include <ImfCompressor.h> |
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#include "ImathBox.h" |
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#include "ImathFun.h" |
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#include <ImfXdr.h> |
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#include <ImfConvert.h> |
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#include <ImfThreading.h> |
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#include "IlmThreadPool.h" |
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#include "IlmThreadSemaphore.h" |
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#include "IlmThreadMutex.h" |
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#include "Iex.h" |
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#include <string> |
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#include <vector> |
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#include <assert.h> |
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namespace Imf { |
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using Imath::Box2i; |
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using Imath::divp; |
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using Imath::modp; |
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using std::string; |
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using std::vector; |
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using std::ifstream; |
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using std::min; |
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using std::max; |
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using IlmThread::Mutex; |
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using IlmThread::Lock; |
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using IlmThread::Semaphore; |
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using IlmThread::Task; |
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using IlmThread::TaskGroup; |
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using IlmThread::ThreadPool; |
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namespace { |
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struct InSliceInfo |
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{ |
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PixelType typeInFrameBuffer; |
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PixelType typeInFile; |
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char * base; |
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size_t xStride; |
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size_t yStride; |
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int xSampling; |
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int ySampling; |
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bool fill; |
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bool skip; |
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double fillValue; |
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InSliceInfo (PixelType typeInFrameBuffer = HALF, |
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PixelType typeInFile = HALF, |
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char *base = 0, |
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size_t xStride = 0, |
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size_t yStride = 0, |
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int xSampling = 1, |
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int ySampling = 1, |
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bool fill = false, |
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bool skip = false, |
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double fillValue = 0.0); |
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}; |
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InSliceInfo::InSliceInfo (PixelType tifb, |
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PixelType tifl, |
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char *b, |
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size_t xs, size_t ys, |
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int xsm, int ysm, |
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bool f, bool s, |
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double fv) |
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: |
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typeInFrameBuffer (tifb), |
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typeInFile (tifl), |
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base (b), |
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xStride (xs), |
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yStride (ys), |
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xSampling (xsm), |
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ySampling (ysm), |
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fill (f), |
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skip (s), |
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fillValue (fv) |
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{ |
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// empty |
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} |
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struct LineBuffer |
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{ |
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const char * uncompressedData; |
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char * buffer; |
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int dataSize; |
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int minY; |
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int maxY; |
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Compressor * compressor; |
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Compressor::Format format; |
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int number; |
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bool hasException; |
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string exception; |
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LineBuffer (Compressor * const comp); |
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~LineBuffer (); |
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inline void wait () {_sem.wait();} |
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inline void post () {_sem.post();} |
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private: |
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Semaphore _sem; |
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}; |
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LineBuffer::LineBuffer (Compressor *comp): |
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uncompressedData (0), |
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buffer (0), |
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dataSize (0), |
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compressor (comp), |
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format (defaultFormat(compressor)), |
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number (-1), |
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hasException (false), |
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exception (), |
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_sem (1) |
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{ |
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// empty |
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} |
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LineBuffer::~LineBuffer () |
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{ |
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delete compressor; |
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} |
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} // namespace |
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struct ScanLineInputFile::Data: public Mutex |
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{ |
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Header header; // the image header |
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int version; // file's version |
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FrameBuffer frameBuffer; // framebuffer to write into |
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LineOrder lineOrder; // order of the scanlines in file |
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int minX; // data window's min x coord |
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int maxX; // data window's max x coord |
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int minY; // data window's min y coord |
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int maxY; // data window's max x coord |
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vector<Int64> lineOffsets; // stores offsets in file for |
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// each line |
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bool fileIsComplete; // True if no scanlines are missing |
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// in the file |
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int nextLineBufferMinY; // minimum y of the next linebuffer |
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vector<size_t> bytesPerLine; // combined size of a line over all |
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// channels |
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vector<size_t> offsetInLineBuffer; // offset for each scanline in its |
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// linebuffer |
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vector<InSliceInfo> slices; // info about channels in file |
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IStream * is; // file stream to read from |
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vector<LineBuffer*> lineBuffers; // each holds one line buffer |
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int linesInBuffer; // number of scanlines each buffer |
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// holds |
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size_t lineBufferSize; // size of the line buffer |
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Data (IStream *is, int numThreads); |
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~Data (); |
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inline LineBuffer * getLineBuffer (int number); // hash function from line |
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// buffer indices into our |
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// vector of line buffers |
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}; |
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ScanLineInputFile::Data::Data (IStream *is, int numThreads): |
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is (is) |
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{ |
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// |
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// We need at least one lineBuffer, but if threading is used, |
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// to keep n threads busy we need 2*n lineBuffers |
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// |
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lineBuffers.resize (max (1, 2 * numThreads)); |
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} |
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ScanLineInputFile::Data::~Data () |
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{ |
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for (size_t i = 0; i < lineBuffers.size(); i++) |
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delete lineBuffers[i]; |
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} |
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inline LineBuffer * |
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ScanLineInputFile::Data::getLineBuffer (int lineBufferNumber) |
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{ |
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return lineBuffers[lineBufferNumber % lineBuffers.size()]; |
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} |
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namespace { |
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void |
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reconstructLineOffsets (IStream &is, |
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LineOrder lineOrder, |
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vector<Int64> &lineOffsets) |
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{ |
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Int64 position = is.tellg(); |
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try |
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{ |
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for (unsigned int i = 0; i < lineOffsets.size(); i++) |
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{ |
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Int64 lineOffset = is.tellg(); |
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int y; |
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Xdr::read <StreamIO> (is, y); |
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int dataSize; |
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Xdr::read <StreamIO> (is, dataSize); |
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Xdr::skip <StreamIO> (is, dataSize); |
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if (lineOrder == INCREASING_Y) |
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lineOffsets[i] = lineOffset; |
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else |
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lineOffsets[lineOffsets.size() - i - 1] = lineOffset; |
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} |
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} |
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catch (...) |
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{ |
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// |
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// Suppress all exceptions. This functions is |
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// called only to reconstruct the line offset |
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// table for incomplete files, and exceptions |
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// are likely. |
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// |
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} |
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is.clear(); |
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is.seekg (position); |
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} |
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void |
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readLineOffsets (IStream &is, |
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LineOrder lineOrder, |
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vector<Int64> &lineOffsets, |
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bool &complete) |
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{ |
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for (unsigned int i = 0; i < lineOffsets.size(); i++) |
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{ |
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Xdr::read <StreamIO> (is, lineOffsets[i]); |
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} |
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complete = true; |
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for (unsigned int i = 0; i < lineOffsets.size(); i++) |
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{ |
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if (lineOffsets[i] <= 0) |
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{ |
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// |
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// Invalid data in the line offset table mean that |
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// the file is probably incomplete (the table is |
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// the last thing written to the file). Either |
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// some process is still busy writing the file, |
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// or writing the file was aborted. |
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// |
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// We should still be able to read the existing |
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// parts of the file. In order to do this, we |
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// have to make a sequential scan over the scan |
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// line data to reconstruct the line offset table. |
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// |
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complete = false; |
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reconstructLineOffsets (is, lineOrder, lineOffsets); |
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break; |
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} |
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} |
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} |
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void |
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readPixelData (ScanLineInputFile::Data *ifd, |
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int minY, |
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char *&buffer, |
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int &dataSize) |
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{ |
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// |
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// Read a single line buffer from the input file. |
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// |
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// If the input file is not memory-mapped, we copy the pixel data into |
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// into the array pointed to by buffer. If the file is memory-mapped, |
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// then we change where buffer points to instead of writing into the |
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// array (hence buffer needs to be a reference to a char *). |
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// |
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Int64 lineOffset = |
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ifd->lineOffsets[(minY - ifd->minY) / ifd->linesInBuffer]; |
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if (lineOffset == 0) |
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THROW (Iex::InputExc, "Scan line " << minY << " is missing."); |
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// |
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// Seek to the start of the scan line in the file, |
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// if necessary. |
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// |
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if (ifd->nextLineBufferMinY != minY) |
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ifd->is->seekg (lineOffset); |
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// |
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// Read the data block's header. |
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// |
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int yInFile; |
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Xdr::read <StreamIO> (*ifd->is, yInFile); |
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Xdr::read <StreamIO> (*ifd->is, dataSize); |
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if (yInFile != minY) |
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throw Iex::InputExc ("Unexpected data block y coordinate."); |
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if (dataSize > (int) ifd->lineBufferSize) |
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throw Iex::InputExc ("Unexpected data block length."); |
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// |
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// Read the pixel data. |
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// |
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if (ifd->is->isMemoryMapped ()) |
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buffer = ifd->is->readMemoryMapped (dataSize); |
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else |
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ifd->is->read (buffer, dataSize); |
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// |
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// Keep track of which scan line is the next one in |
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// the file, so that we can avoid redundant seekg() |
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// operations (seekg() can be fairly expensive). |
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// |
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if (ifd->lineOrder == INCREASING_Y) |
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ifd->nextLineBufferMinY = minY + ifd->linesInBuffer; |
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else |
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ifd->nextLineBufferMinY = minY - ifd->linesInBuffer; |
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} |
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// |
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// A LineBufferTask encapsulates the task uncompressing a set of |
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// scanlines (line buffer) and copying them into the frame buffer. |
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// |
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class LineBufferTask : public Task |
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{ |
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public: |
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LineBufferTask (TaskGroup *group, |
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ScanLineInputFile::Data *ifd, |
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LineBuffer *lineBuffer, |
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int scanLineMin, |
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int scanLineMax); |
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virtual ~LineBufferTask (); |
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virtual void execute (); |
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private: |
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ScanLineInputFile::Data * _ifd; |
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LineBuffer * _lineBuffer; |
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int _scanLineMin; |
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int _scanLineMax; |
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}; |
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LineBufferTask::LineBufferTask |
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(TaskGroup *group, |
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ScanLineInputFile::Data *ifd, |
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LineBuffer *lineBuffer, |
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int scanLineMin, |
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int scanLineMax) |
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: |
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Task (group), |
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_ifd (ifd), |
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_lineBuffer (lineBuffer), |
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_scanLineMin (scanLineMin), |
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_scanLineMax (scanLineMax) |
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{ |
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// empty |
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} |
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LineBufferTask::~LineBufferTask () |
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{ |
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// |
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// Signal that the line buffer is now free |
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// |
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_lineBuffer->post (); |
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} |
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void |
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LineBufferTask::execute () |
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{ |
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try |
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{ |
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// |
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// Uncompress the data, if necessary |
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// |
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if (_lineBuffer->uncompressedData == 0) |
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{ |
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int uncompressedSize = 0; |
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int maxY = min (_lineBuffer->maxY, _ifd->maxY); |
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for (int i = _lineBuffer->minY - _ifd->minY; |
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i <= maxY - _ifd->minY; |
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++i) |
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{ |
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uncompressedSize += (int) _ifd->bytesPerLine[i]; |
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} |
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if (_lineBuffer->compressor && |
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_lineBuffer->dataSize < uncompressedSize) |
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{ |
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_lineBuffer->format = _lineBuffer->compressor->format(); |
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_lineBuffer->dataSize = _lineBuffer->compressor->uncompress |
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(_lineBuffer->buffer, _lineBuffer->dataSize, |
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_lineBuffer->minY, _lineBuffer->uncompressedData); |
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} |
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else |
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{ |
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// |
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// If the line is uncompressed, it's in XDR format, |
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// regardless of the compressor's output format. |
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// |
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_lineBuffer->format = Compressor::XDR; |
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_lineBuffer->uncompressedData = _lineBuffer->buffer; |
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} |
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} |
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int yStart, yStop, dy; |
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if (_ifd->lineOrder == INCREASING_Y) |
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{ |
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yStart = _scanLineMin; |
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yStop = _scanLineMax + 1; |
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dy = 1; |
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} |
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else |
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{ |
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yStart = _scanLineMax; |
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yStop = _scanLineMin - 1; |
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dy = -1; |
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} |
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for (int y = yStart; y != yStop; y += dy) |
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{ |
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// |
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// Convert one scan line's worth of pixel data back |
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// from the machine-independent representation, and |
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// store the result in the frame buffer. |
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// |
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const char *readPtr = _lineBuffer->uncompressedData + |
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_ifd->offsetInLineBuffer[y - _ifd->minY]; |
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// |
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// Iterate over all image channels. |
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// |
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for (unsigned int i = 0; i < _ifd->slices.size(); ++i) |
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{ |
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// |
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// Test if scan line y of this channel contains any data |
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// (the scan line contains data only if y % ySampling == 0). |
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// |
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const InSliceInfo &slice = _ifd->slices[i]; |
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if (modp (y, slice.ySampling) != 0) |
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continue; |
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// |
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// Find the x coordinates of the leftmost and rightmost |
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// sampled pixels (i.e. pixels within the data window |
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// for which x % xSampling == 0). |
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// |
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int dMinX = divp (_ifd->minX, slice.xSampling); |
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int dMaxX = divp (_ifd->maxX, slice.xSampling); |
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// |
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// Fill the frame buffer with pixel data. |
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// |
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if (slice.skip) |
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{ |
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// |
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// The file contains data for this channel, but |
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// the frame buffer contains no slice for this channel. |
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// |
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skipChannel (readPtr, slice.typeInFile, dMaxX - dMinX + 1); |
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} |
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else |
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{ |
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// |
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// The frame buffer contains a slice for this channel. |
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// |
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char *linePtr = slice.base + |
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divp (y, slice.ySampling) * |
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slice.yStride; |
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char *writePtr = linePtr + dMinX * slice.xStride; |
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char *endPtr = linePtr + dMaxX * slice.xStride; |
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copyIntoFrameBuffer (readPtr, writePtr, endPtr, |
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slice.xStride, slice.fill, |
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slice.fillValue, _lineBuffer->format, |
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slice.typeInFrameBuffer, |
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slice.typeInFile); |
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} |
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} |
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} |
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} |
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catch (std::exception &e) |
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{ |
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if (!_lineBuffer->hasException) |
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{ |
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_lineBuffer->exception = e.what(); |
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_lineBuffer->hasException = true; |
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} |
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} |
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catch (...) |
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{ |
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if (!_lineBuffer->hasException) |
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{ |
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_lineBuffer->exception = "unrecognized exception"; |
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_lineBuffer->hasException = true; |
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} |
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} |
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} |
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LineBufferTask * |
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newLineBufferTask |
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(TaskGroup *group, |
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ScanLineInputFile::Data *ifd, |
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int number, |
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int scanLineMin, |
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int scanLineMax) |
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{ |
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// |
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// Wait for a line buffer to become available, fill the line |
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// buffer with raw data from the file if necessary, and create |
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// a new LineBufferTask whose execute() method will uncompress |
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// the contents of the buffer and copy the pixels into the |
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// frame buffer. |
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// |
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LineBuffer *lineBuffer = ifd->getLineBuffer (number); |
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try |
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{ |
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lineBuffer->wait (); |
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if (lineBuffer->number != number) |
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{ |
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lineBuffer->minY = ifd->minY + number * ifd->linesInBuffer; |
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lineBuffer->maxY = lineBuffer->minY + ifd->linesInBuffer - 1; |
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lineBuffer->number = number; |
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lineBuffer->uncompressedData = 0; |
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readPixelData (ifd, lineBuffer->minY, |
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lineBuffer->buffer, |
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lineBuffer->dataSize); |
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} |
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} |
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catch (std::exception &e) |
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{ |
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if (!lineBuffer->hasException) |
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{ |
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lineBuffer->exception = e.what(); |
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lineBuffer->hasException = true; |
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} |
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lineBuffer->number = -1; |
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lineBuffer->post();\ |
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throw; |
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} |
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catch (...) |
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{ |
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// |
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// Reading from the file caused an exception. |
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// Signal that the line buffer is free, and |
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// re-throw the exception. |
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// |
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lineBuffer->exception = "unrecognized exception"; |
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lineBuffer->hasException = true; |
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lineBuffer->number = -1; |
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lineBuffer->post(); |
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throw; |
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} |
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scanLineMin = max (lineBuffer->minY, scanLineMin); |
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scanLineMax = min (lineBuffer->maxY, scanLineMax); |
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return new LineBufferTask (group, ifd, lineBuffer, |
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scanLineMin, scanLineMax); |
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} |
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} // namespace |
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ScanLineInputFile::ScanLineInputFile |
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(const Header &header, |
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IStream *is, |
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int numThreads) |
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: |
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_data (new Data (is, numThreads)) |
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{ |
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try |
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{ |
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_data->header = header; |
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_data->lineOrder = _data->header.lineOrder(); |
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const Box2i &dataWindow = _data->header.dataWindow(); |
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_data->minX = dataWindow.min.x; |
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_data->maxX = dataWindow.max.x; |
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_data->minY = dataWindow.min.y; |
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_data->maxY = dataWindow.max.y; |
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size_t maxBytesPerLine = bytesPerLineTable (_data->header, |
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_data->bytesPerLine); |
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for (size_t i = 0; i < _data->lineBuffers.size(); i++) |
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{ |
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_data->lineBuffers[i] = new LineBuffer (newCompressor |
|
(_data->header.compression(), |
|
maxBytesPerLine, |
|
_data->header)); |
|
} |
|
|
|
_data->linesInBuffer = |
|
numLinesInBuffer (_data->lineBuffers[0]->compressor); |
|
|
|
_data->lineBufferSize = maxBytesPerLine * _data->linesInBuffer; |
|
|
|
if (!_data->is->isMemoryMapped()) |
|
for (size_t i = 0; i < _data->lineBuffers.size(); i++) |
|
_data->lineBuffers[i]->buffer = new char[_data->lineBufferSize]; |
|
|
|
_data->nextLineBufferMinY = _data->minY - 1; |
|
|
|
offsetInLineBufferTable (_data->bytesPerLine, |
|
_data->linesInBuffer, |
|
_data->offsetInLineBuffer); |
|
|
|
int lineOffsetSize = (dataWindow.max.y - dataWindow.min.y + |
|
_data->linesInBuffer) / _data->linesInBuffer; |
|
|
|
_data->lineOffsets.resize (lineOffsetSize); |
|
|
|
readLineOffsets (*_data->is, |
|
_data->lineOrder, |
|
_data->lineOffsets, |
|
_data->fileIsComplete); |
|
} |
|
catch (...) |
|
{ |
|
delete _data; |
|
throw; |
|
} |
|
} |
|
|
|
|
|
ScanLineInputFile::~ScanLineInputFile () |
|
{ |
|
if (!_data->is->isMemoryMapped()) |
|
for (size_t i = 0; i < _data->lineBuffers.size(); i++) |
|
delete [] _data->lineBuffers[i]->buffer; |
|
|
|
delete _data; |
|
} |
|
|
|
|
|
const char * |
|
ScanLineInputFile::fileName () const |
|
{ |
|
return _data->is->fileName(); |
|
} |
|
|
|
|
|
const Header & |
|
ScanLineInputFile::header () const |
|
{ |
|
return _data->header; |
|
} |
|
|
|
|
|
int |
|
ScanLineInputFile::version () const |
|
{ |
|
return _data->version; |
|
} |
|
|
|
|
|
void |
|
ScanLineInputFile::setFrameBuffer (const FrameBuffer &frameBuffer) |
|
{ |
|
Lock lock (*_data); |
|
|
|
// |
|
// Check if the new frame buffer descriptor is |
|
// compatible with the image file header. |
|
// |
|
|
|
const ChannelList &channels = _data->header.channels(); |
|
|
|
for (FrameBuffer::ConstIterator j = frameBuffer.begin(); |
|
j != frameBuffer.end(); |
|
++j) |
|
{ |
|
ChannelList::ConstIterator i = channels.find (j.name()); |
|
|
|
if (i == channels.end()) |
|
continue; |
|
|
|
if (i.channel().xSampling != j.slice().xSampling || |
|
i.channel().ySampling != j.slice().ySampling) |
|
THROW (Iex::ArgExc, "X and/or y subsampling factors " |
|
"of \"" << i.name() << "\" channel " |
|
"of input file \"" << fileName() << "\" are " |
|
"not compatible with the frame buffer's " |
|
"subsampling factors."); |
|
} |
|
|
|
// |
|
// Initialize the slice table for readPixels(). |
|
// |
|
|
|
vector<InSliceInfo> slices; |
|
ChannelList::ConstIterator i = channels.begin(); |
|
|
|
for (FrameBuffer::ConstIterator j = frameBuffer.begin(); |
|
j != frameBuffer.end(); |
|
++j) |
|
{ |
|
while (i != channels.end() && strcmp (i.name(), j.name()) < 0) |
|
{ |
|
// |
|
// Channel i is present in the file but not |
|
// in the frame buffer; data for channel i |
|
// will be skipped during readPixels(). |
|
// |
|
|
|
slices.push_back (InSliceInfo (i.channel().type, |
|
i.channel().type, |
|
0, // base |
|
0, // xStride |
|
0, // yStride |
|
i.channel().xSampling, |
|
i.channel().ySampling, |
|
false, // fill |
|
true, // skip |
|
0.0)); // fillValue |
|
++i; |
|
} |
|
|
|
bool fill = false; |
|
|
|
if (i == channels.end() || strcmp (i.name(), j.name()) > 0) |
|
{ |
|
// |
|
// Channel i is present in the frame buffer, but not in the file. |
|
// In the frame buffer, slice j will be filled with a default value. |
|
// |
|
|
|
fill = true; |
|
} |
|
|
|
slices.push_back (InSliceInfo (j.slice().type, |
|
fill? j.slice().type: |
|
i.channel().type, |
|
j.slice().base, |
|
j.slice().xStride, |
|
j.slice().yStride, |
|
j.slice().xSampling, |
|
j.slice().ySampling, |
|
fill, |
|
false, // skip |
|
j.slice().fillValue)); |
|
|
|
if (i != channels.end() && !fill) |
|
++i; |
|
} |
|
|
|
// |
|
// Store the new frame buffer. |
|
// |
|
|
|
_data->frameBuffer = frameBuffer; |
|
_data->slices = slices; |
|
} |
|
|
|
|
|
const FrameBuffer & |
|
ScanLineInputFile::frameBuffer () const |
|
{ |
|
Lock lock (*_data); |
|
return _data->frameBuffer; |
|
} |
|
|
|
|
|
bool |
|
ScanLineInputFile::isComplete () const |
|
{ |
|
return _data->fileIsComplete; |
|
} |
|
|
|
|
|
void |
|
ScanLineInputFile::readPixels (int scanLine1, int scanLine2) |
|
{ |
|
try |
|
{ |
|
Lock lock (*_data); |
|
|
|
if (_data->slices.size() == 0) |
|
throw Iex::ArgExc ("No frame buffer specified " |
|
"as pixel data destination."); |
|
|
|
int scanLineMin = min (scanLine1, scanLine2); |
|
int scanLineMax = max (scanLine1, scanLine2); |
|
|
|
if (scanLineMin < _data->minY || scanLineMax > _data->maxY) |
|
throw Iex::ArgExc ("Tried to read scan line outside " |
|
"the image file's data window."); |
|
|
|
// |
|
// We impose a numbering scheme on the lineBuffers where the first |
|
// scanline is contained in lineBuffer 1. |
|
// |
|
// Determine the first and last lineBuffer numbers in this scanline |
|
// range. We always attempt to read the scanlines in the order that |
|
// they are stored in the file. |
|
// |
|
|
|
int start, stop, dl; |
|
|
|
if (_data->lineOrder == INCREASING_Y) |
|
{ |
|
start = (scanLineMin - _data->minY) / _data->linesInBuffer; |
|
stop = (scanLineMax - _data->minY) / _data->linesInBuffer + 1; |
|
dl = 1; |
|
} |
|
else |
|
{ |
|
start = (scanLineMax - _data->minY) / _data->linesInBuffer; |
|
stop = (scanLineMin - _data->minY) / _data->linesInBuffer - 1; |
|
dl = -1; |
|
} |
|
|
|
// |
|
// Create a task group for all line buffer tasks. When the |
|
// task group goes out of scope, the destructor waits until |
|
// all tasks are complete. |
|
// |
|
|
|
{ |
|
TaskGroup taskGroup; |
|
|
|
// |
|
// Add the line buffer tasks. |
|
// |
|
// The tasks will execute in the order that they are created |
|
// because we lock the line buffers during construction and the |
|
// constructors are called by the main thread. Hence, in order |
|
// for a successive task to execute the previous task which |
|
// used that line buffer must have completed already. |
|
// |
|
|
|
for (int l = start; l != stop; l += dl) |
|
{ |
|
ThreadPool::addGlobalTask (newLineBufferTask (&taskGroup, |
|
_data, l, |
|
scanLineMin, |
|
scanLineMax)); |
|
} |
|
|
|
// |
|
// finish all tasks |
|
// |
|
} |
|
|
|
// |
|
// Exeption handling: |
|
// |
|
// LineBufferTask::execute() may have encountered exceptions, but |
|
// those exceptions occurred in another thread, not in the thread |
|
// that is executing this call to ScanLineInputFile::readPixels(). |
|
// LineBufferTask::execute() has caught all exceptions and stored |
|
// the exceptions' what() strings in the line buffers. |
|
// Now we check if any line buffer contains a stored exception; if |
|
// this is the case then we re-throw the exception in this thread. |
|
// (It is possible that multiple line buffers contain stored |
|
// exceptions. We re-throw the first exception we find and |
|
// ignore all others.) |
|
// |
|
|
|
const string *exception = 0; |
|
|
|
for (int i = 0; i < _data->lineBuffers.size(); ++i) |
|
{ |
|
LineBuffer *lineBuffer = _data->lineBuffers[i]; |
|
|
|
if (lineBuffer->hasException && !exception) |
|
exception = &lineBuffer->exception; |
|
|
|
lineBuffer->hasException = false; |
|
} |
|
|
|
if (exception) |
|
throw Iex::IoExc (*exception); |
|
} |
|
catch (Iex::BaseExc &e) |
|
{ |
|
REPLACE_EXC (e, "Error reading pixel data from image " |
|
"file \"" << fileName() << "\". " << e); |
|
throw; |
|
} |
|
} |
|
|
|
|
|
void |
|
ScanLineInputFile::readPixels (int scanLine) |
|
{ |
|
readPixels (scanLine, scanLine); |
|
} |
|
|
|
|
|
void |
|
ScanLineInputFile::rawPixelData (int firstScanLine, |
|
const char *&pixelData, |
|
int &pixelDataSize) |
|
{ |
|
try |
|
{ |
|
Lock lock (*_data); |
|
|
|
if (firstScanLine < _data->minY || firstScanLine > _data->maxY) |
|
{ |
|
throw Iex::ArgExc ("Tried to read scan line outside " |
|
"the image file's data window."); |
|
} |
|
|
|
int minY = lineBufferMinY |
|
(firstScanLine, _data->minY, _data->linesInBuffer); |
|
|
|
readPixelData |
|
(_data, minY, _data->lineBuffers[0]->buffer, pixelDataSize); |
|
|
|
pixelData = _data->lineBuffers[0]->buffer; |
|
} |
|
catch (Iex::BaseExc &e) |
|
{ |
|
REPLACE_EXC (e, "Error reading pixel data from image " |
|
"file \"" << fileName() << "\". " << e); |
|
throw; |
|
} |
|
} |
|
|
|
} // namespace Imf
|
|
|