/dependencies/FreeImage/Source/OpenEXR/IlmImf/ImfScanLineInputFile.cpp
C++ | 1021 lines | 632 code | 185 blank | 204 comment | 71 complexity | 223a169400d1729ee294f31727e100e8 MD5 | raw file
- ///////////////////////////////////////////////////////////////////////////
- //
- // Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
- // Digital Ltd. LLC
- //
- // All rights reserved.
- //
- // Redistribution and use in source and binary forms, with or without
- // modification, are permitted provided that the following conditions are
- // met:
- // * Redistributions of source code must retain the above copyright
- // notice, this list of conditions and the following disclaimer.
- // * Redistributions in binary form must reproduce the above
- // copyright notice, this list of conditions and the following disclaimer
- // in the documentation and/or other materials provided with the
- // distribution.
- // * Neither the name of Industrial Light & Magic nor the names of
- // its contributors may be used to endorse or promote products derived
- // from this software without specific prior written permission.
- //
- // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- //
- ///////////////////////////////////////////////////////////////////////////
- //-----------------------------------------------------------------------------
- //
- // class ScanLineInputFile
- //
- //-----------------------------------------------------------------------------
- #include <ImfScanLineInputFile.h>
- #include <ImfChannelList.h>
- #include <ImfMisc.h>
- #include <ImfStdIO.h>
- #include <ImfCompressor.h>
- #include "ImathBox.h"
- #include "ImathFun.h"
- #include <ImfXdr.h>
- #include <ImfConvert.h>
- #include <ImfThreading.h>
- #include "IlmThreadPool.h"
- #include "IlmThreadSemaphore.h"
- #include "IlmThreadMutex.h"
- #include "Iex.h"
- #include <string>
- #include <vector>
- #include <assert.h>
- namespace Imf {
- using Imath::Box2i;
- using Imath::divp;
- using Imath::modp;
- using std::string;
- using std::vector;
- using std::ifstream;
- using std::min;
- using std::max;
- using IlmThread::Mutex;
- using IlmThread::Lock;
- using IlmThread::Semaphore;
- using IlmThread::Task;
- using IlmThread::TaskGroup;
- using IlmThread::ThreadPool;
- namespace {
- struct InSliceInfo
- {
- PixelType typeInFrameBuffer;
- PixelType typeInFile;
- char * base;
- size_t xStride;
- size_t yStride;
- int xSampling;
- int ySampling;
- bool fill;
- bool skip;
- double fillValue;
- InSliceInfo (PixelType typeInFrameBuffer = HALF,
- PixelType typeInFile = HALF,
- char *base = 0,
- size_t xStride = 0,
- size_t yStride = 0,
- int xSampling = 1,
- int ySampling = 1,
- bool fill = false,
- bool skip = false,
- double fillValue = 0.0);
- };
- InSliceInfo::InSliceInfo (PixelType tifb,
- PixelType tifl,
- char *b,
- size_t xs, size_t ys,
- int xsm, int ysm,
- bool f, bool s,
- double fv)
- :
- typeInFrameBuffer (tifb),
- typeInFile (tifl),
- base (b),
- xStride (xs),
- yStride (ys),
- xSampling (xsm),
- ySampling (ysm),
- fill (f),
- skip (s),
- fillValue (fv)
- {
- // empty
- }
- struct LineBuffer
- {
- const char * uncompressedData;
- char * buffer;
- int dataSize;
- int minY;
- int maxY;
- Compressor * compressor;
- Compressor::Format format;
- int number;
- bool hasException;
- string exception;
- LineBuffer (Compressor * const comp);
- ~LineBuffer ();
- inline void wait () {_sem.wait();}
- inline void post () {_sem.post();}
- private:
- Semaphore _sem;
- };
- LineBuffer::LineBuffer (Compressor *comp):
- uncompressedData (0),
- buffer (0),
- dataSize (0),
- compressor (comp),
- format (defaultFormat(compressor)),
- number (-1),
- hasException (false),
- exception (),
- _sem (1)
- {
- // empty
- }
- LineBuffer::~LineBuffer ()
- {
- delete compressor;
- }
- } // namespace
- struct ScanLineInputFile::Data: public Mutex
- {
- Header header; // the image header
- int version; // file's version
- FrameBuffer frameBuffer; // framebuffer to write into
- LineOrder lineOrder; // order of the scanlines in file
- int minX; // data window's min x coord
- int maxX; // data window's max x coord
- int minY; // data window's min y coord
- int maxY; // data window's max x coord
- vector<Int64> lineOffsets; // stores offsets in file for
- // each line
- bool fileIsComplete; // True if no scanlines are missing
- // in the file
- int nextLineBufferMinY; // minimum y of the next linebuffer
- vector<size_t> bytesPerLine; // combined size of a line over all
- // channels
- vector<size_t> offsetInLineBuffer; // offset for each scanline in its
- // linebuffer
- vector<InSliceInfo> slices; // info about channels in file
- IStream * is; // file stream to read from
-
- vector<LineBuffer*> lineBuffers; // each holds one line buffer
- int linesInBuffer; // number of scanlines each buffer
- // holds
- size_t lineBufferSize; // size of the line buffer
- Data (IStream *is, int numThreads);
- ~Data ();
-
- inline LineBuffer * getLineBuffer (int number); // hash function from line
- // buffer indices into our
- // vector of line buffers
- };
- ScanLineInputFile::Data::Data (IStream *is, int numThreads):
- is (is)
- {
- //
- // We need at least one lineBuffer, but if threading is used,
- // to keep n threads busy we need 2*n lineBuffers
- //
- lineBuffers.resize (max (1, 2 * numThreads));
- }
- ScanLineInputFile::Data::~Data ()
- {
- for (size_t i = 0; i < lineBuffers.size(); i++)
- delete lineBuffers[i];
- }
- inline LineBuffer *
- ScanLineInputFile::Data::getLineBuffer (int lineBufferNumber)
- {
- return lineBuffers[lineBufferNumber % lineBuffers.size()];
- }
- namespace {
- void
- reconstructLineOffsets (IStream &is,
- LineOrder lineOrder,
- vector<Int64> &lineOffsets)
- {
- Int64 position = is.tellg();
- try
- {
- for (unsigned int i = 0; i < lineOffsets.size(); i++)
- {
- Int64 lineOffset = is.tellg();
- int y;
- Xdr::read <StreamIO> (is, y);
- int dataSize;
- Xdr::read <StreamIO> (is, dataSize);
- Xdr::skip <StreamIO> (is, dataSize);
- if (lineOrder == INCREASING_Y)
- lineOffsets[i] = lineOffset;
- else
- lineOffsets[lineOffsets.size() - i - 1] = lineOffset;
- }
- }
- catch (...)
- {
- //
- // Suppress all exceptions. This functions is
- // called only to reconstruct the line offset
- // table for incomplete files, and exceptions
- // are likely.
- //
- }
- is.clear();
- is.seekg (position);
- }
- void
- readLineOffsets (IStream &is,
- LineOrder lineOrder,
- vector<Int64> &lineOffsets,
- bool &complete)
- {
- for (unsigned int i = 0; i < lineOffsets.size(); i++)
- {
- Xdr::read <StreamIO> (is, lineOffsets[i]);
- }
- complete = true;
- for (unsigned int i = 0; i < lineOffsets.size(); i++)
- {
- if (lineOffsets[i] <= 0)
- {
- //
- // Invalid data in the line offset table mean that
- // the file is probably incomplete (the table is
- // the last thing written to the file). Either
- // some process is still busy writing the file,
- // or writing the file was aborted.
- //
- // We should still be able to read the existing
- // parts of the file. In order to do this, we
- // have to make a sequential scan over the scan
- // line data to reconstruct the line offset table.
- //
- complete = false;
- reconstructLineOffsets (is, lineOrder, lineOffsets);
- break;
- }
- }
- }
- void
- readPixelData (ScanLineInputFile::Data *ifd,
- int minY,
- char *&buffer,
- int &dataSize)
- {
- //
- // Read a single line buffer from the input file.
- //
- // If the input file is not memory-mapped, we copy the pixel data into
- // into the array pointed to by buffer. If the file is memory-mapped,
- // then we change where buffer points to instead of writing into the
- // array (hence buffer needs to be a reference to a char *).
- //
- Int64 lineOffset =
- ifd->lineOffsets[(minY - ifd->minY) / ifd->linesInBuffer];
- if (lineOffset == 0)
- THROW (Iex::InputExc, "Scan line " << minY << " is missing.");
- //
- // Seek to the start of the scan line in the file,
- // if necessary.
- //
- if (ifd->nextLineBufferMinY != minY)
- ifd->is->seekg (lineOffset);
- //
- // Read the data block's header.
- //
- int yInFile;
- Xdr::read <StreamIO> (*ifd->is, yInFile);
- Xdr::read <StreamIO> (*ifd->is, dataSize);
-
- if (yInFile != minY)
- throw Iex::InputExc ("Unexpected data block y coordinate.");
- if (dataSize > (int) ifd->lineBufferSize)
- throw Iex::InputExc ("Unexpected data block length.");
- //
- // Read the pixel data.
- //
- if (ifd->is->isMemoryMapped ())
- buffer = ifd->is->readMemoryMapped (dataSize);
- else
- ifd->is->read (buffer, dataSize);
- //
- // Keep track of which scan line is the next one in
- // the file, so that we can avoid redundant seekg()
- // operations (seekg() can be fairly expensive).
- //
- if (ifd->lineOrder == INCREASING_Y)
- ifd->nextLineBufferMinY = minY + ifd->linesInBuffer;
- else
- ifd->nextLineBufferMinY = minY - ifd->linesInBuffer;
- }
- //
- // A LineBufferTask encapsulates the task uncompressing a set of
- // scanlines (line buffer) and copying them into the frame buffer.
- //
- class LineBufferTask : public Task
- {
- public:
- LineBufferTask (TaskGroup *group,
- ScanLineInputFile::Data *ifd,
- LineBuffer *lineBuffer,
- int scanLineMin,
- int scanLineMax);
- virtual ~LineBufferTask ();
- virtual void execute ();
- private:
- ScanLineInputFile::Data * _ifd;
- LineBuffer * _lineBuffer;
- int _scanLineMin;
- int _scanLineMax;
- };
- LineBufferTask::LineBufferTask
- (TaskGroup *group,
- ScanLineInputFile::Data *ifd,
- LineBuffer *lineBuffer,
- int scanLineMin,
- int scanLineMax)
- :
- Task (group),
- _ifd (ifd),
- _lineBuffer (lineBuffer),
- _scanLineMin (scanLineMin),
- _scanLineMax (scanLineMax)
- {
- // empty
- }
- LineBufferTask::~LineBufferTask ()
- {
- //
- // Signal that the line buffer is now free
- //
- _lineBuffer->post ();
- }
- void
- LineBufferTask::execute ()
- {
- try
- {
- //
- // Uncompress the data, if necessary
- //
-
- if (_lineBuffer->uncompressedData == 0)
- {
- int uncompressedSize = 0;
- int maxY = min (_lineBuffer->maxY, _ifd->maxY);
-
- for (int i = _lineBuffer->minY - _ifd->minY;
- i <= maxY - _ifd->minY;
- ++i)
- {
- uncompressedSize += (int) _ifd->bytesPerLine[i];
- }
-
- if (_lineBuffer->compressor &&
- _lineBuffer->dataSize < uncompressedSize)
- {
- _lineBuffer->format = _lineBuffer->compressor->format();
- _lineBuffer->dataSize = _lineBuffer->compressor->uncompress
- (_lineBuffer->buffer, _lineBuffer->dataSize,
- _lineBuffer->minY, _lineBuffer->uncompressedData);
- }
- else
- {
- //
- // If the line is uncompressed, it's in XDR format,
- // regardless of the compressor's output format.
- //
-
- _lineBuffer->format = Compressor::XDR;
- _lineBuffer->uncompressedData = _lineBuffer->buffer;
- }
- }
-
- int yStart, yStop, dy;
- if (_ifd->lineOrder == INCREASING_Y)
- {
- yStart = _scanLineMin;
- yStop = _scanLineMax + 1;
- dy = 1;
- }
- else
- {
- yStart = _scanLineMax;
- yStop = _scanLineMin - 1;
- dy = -1;
- }
-
- for (int y = yStart; y != yStop; y += dy)
- {
- //
- // Convert one scan line's worth of pixel data back
- // from the machine-independent representation, and
- // store the result in the frame buffer.
- //
-
- const char *readPtr = _lineBuffer->uncompressedData +
- _ifd->offsetInLineBuffer[y - _ifd->minY];
-
- //
- // Iterate over all image channels.
- //
-
- for (unsigned int i = 0; i < _ifd->slices.size(); ++i)
- {
- //
- // Test if scan line y of this channel contains any data
- // (the scan line contains data only if y % ySampling == 0).
- //
-
- const InSliceInfo &slice = _ifd->slices[i];
-
- if (modp (y, slice.ySampling) != 0)
- continue;
-
- //
- // Find the x coordinates of the leftmost and rightmost
- // sampled pixels (i.e. pixels within the data window
- // for which x % xSampling == 0).
- //
-
- int dMinX = divp (_ifd->minX, slice.xSampling);
- int dMaxX = divp (_ifd->maxX, slice.xSampling);
-
- //
- // Fill the frame buffer with pixel data.
- //
-
- if (slice.skip)
- {
- //
- // The file contains data for this channel, but
- // the frame buffer contains no slice for this channel.
- //
-
- skipChannel (readPtr, slice.typeInFile, dMaxX - dMinX + 1);
- }
- else
- {
- //
- // The frame buffer contains a slice for this channel.
- //
-
- char *linePtr = slice.base +
- divp (y, slice.ySampling) *
- slice.yStride;
-
- char *writePtr = linePtr + dMinX * slice.xStride;
- char *endPtr = linePtr + dMaxX * slice.xStride;
-
- copyIntoFrameBuffer (readPtr, writePtr, endPtr,
- slice.xStride, slice.fill,
- slice.fillValue, _lineBuffer->format,
- slice.typeInFrameBuffer,
- slice.typeInFile);
- }
- }
- }
- }
- catch (std::exception &e)
- {
- if (!_lineBuffer->hasException)
- {
- _lineBuffer->exception = e.what();
- _lineBuffer->hasException = true;
- }
- }
- catch (...)
- {
- if (!_lineBuffer->hasException)
- {
- _lineBuffer->exception = "unrecognized exception";
- _lineBuffer->hasException = true;
- }
- }
- }
- LineBufferTask *
- newLineBufferTask
- (TaskGroup *group,
- ScanLineInputFile::Data *ifd,
- int number,
- int scanLineMin,
- 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