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1022 lines
26 KiB
C++
1022 lines
26 KiB
C++
///////////////////////////////////////////////////////////////////////////
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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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|
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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)
|
|
{
|
|
//
|
|
// Wait for a line buffer to become available, fill the line
|
|
// buffer with raw data from the file if necessary, and create
|
|
// a new LineBufferTask whose execute() method will uncompress
|
|
// the contents of the buffer and copy the pixels into the
|
|
// frame buffer.
|
|
//
|
|
|
|
LineBuffer *lineBuffer = ifd->getLineBuffer (number);
|
|
|
|
try
|
|
{
|
|
lineBuffer->wait ();
|
|
|
|
if (lineBuffer->number != number)
|
|
{
|
|
lineBuffer->minY = ifd->minY + number * ifd->linesInBuffer;
|
|
lineBuffer->maxY = lineBuffer->minY + ifd->linesInBuffer - 1;
|
|
|
|
lineBuffer->number = number;
|
|
lineBuffer->uncompressedData = 0;
|
|
|
|
readPixelData (ifd, lineBuffer->minY,
|
|
lineBuffer->buffer,
|
|
lineBuffer->dataSize);
|
|
}
|
|
}
|
|
catch (std::exception &e)
|
|
{
|
|
if (!lineBuffer->hasException)
|
|
{
|
|
lineBuffer->exception = e.what();
|
|
lineBuffer->hasException = true;
|
|
}
|
|
lineBuffer->number = -1;
|
|
lineBuffer->post();\
|
|
throw;
|
|
}
|
|
catch (...)
|
|
{
|
|
//
|
|
// Reading from the file caused an exception.
|
|
// Signal that the line buffer is free, and
|
|
// re-throw the exception.
|
|
//
|
|
|
|
lineBuffer->exception = "unrecognized exception";
|
|
lineBuffer->hasException = true;
|
|
lineBuffer->number = -1;
|
|
lineBuffer->post();
|
|
throw;
|
|
}
|
|
|
|
scanLineMin = max (lineBuffer->minY, scanLineMin);
|
|
scanLineMax = min (lineBuffer->maxY, scanLineMax);
|
|
|
|
return new LineBufferTask (group, ifd, lineBuffer,
|
|
scanLineMin, scanLineMax);
|
|
}
|
|
|
|
} // namespace
|
|
|
|
|
|
ScanLineInputFile::ScanLineInputFile
|
|
(const Header &header,
|
|
IStream *is,
|
|
int numThreads)
|
|
:
|
|
_data (new Data (is, numThreads))
|
|
{
|
|
try
|
|
{
|
|
_data->header = header;
|
|
|
|
_data->lineOrder = _data->header.lineOrder();
|
|
|
|
const Box2i &dataWindow = _data->header.dataWindow();
|
|
|
|
_data->minX = dataWindow.min.x;
|
|
_data->maxX = dataWindow.max.x;
|
|
_data->minY = dataWindow.min.y;
|
|
_data->maxY = dataWindow.max.y;
|
|
|
|
size_t maxBytesPerLine = bytesPerLineTable (_data->header,
|
|
_data->bytesPerLine);
|
|
|
|
for (size_t i = 0; i < _data->lineBuffers.size(); i++)
|
|
{
|
|
_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
|