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///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2011, Industrial Light & Magic, a division of Lucas
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///////////////////////////////////////////////////////////////////////////
#ifndef INCLUDED_IMF_DEEP_SCAN_LINE_INPUT_FILE_H
#define INCLUDED_IMF_DEEP_SCAN_LINE_INPUT_FILE_H
//-----------------------------------------------------------------------------
//
// class DeepScanLineInputFile
//
//-----------------------------------------------------------------------------
#include "ImfThreading.h"
#include "ImfGenericInputFile.h"
#include "ImfNamespace.h"
#include "ImfForward.h"
#include "ImfExport.h"
#include "ImfDeepScanLineOutputFile.h"
OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER
class IMF_EXPORT DeepScanLineInputFile : public GenericInputFile
{
public:
//------------
// Constructor
//------------
DeepScanLineInputFile (const char fileName[],
int numThreads = globalThreadCount());
DeepScanLineInputFile (const Header &header, OPENEXR_IMF_INTERNAL_NAMESPACE::IStream *is,
int version, /*version field from file*/
int numThreads = globalThreadCount());
//-----------------------------------------
// Destructor -- deallocates internal data
// structures, but does not close the file.
//-----------------------------------------
virtual ~DeepScanLineInputFile ();
//------------------------
// Access to the file name
//------------------------
const char * fileName () const;
//--------------------------
// Access to the file header
//--------------------------
const Header & header () const;
//----------------------------------
// Access to the file format version
//----------------------------------
int version () const;
//-----------------------------------------------------------
// Set the current frame buffer -- copies the FrameBuffer
// object into the InputFile object.
//
// The current frame buffer is the destination for the pixel
// data read from the file. The current frame buffer must be
// set at least once before readPixels() is called.
// The current frame buffer can be changed after each call
// to readPixels().
//-----------------------------------------------------------
void setFrameBuffer (const DeepFrameBuffer &frameBuffer);
//-----------------------------------
// Access to the current frame buffer
//-----------------------------------
const DeepFrameBuffer & frameBuffer () const;
//---------------------------------------------------------------
// Check if the file is complete:
//
// isComplete() returns true if all pixels in the data window are
// present in the input file, or false if any pixels are missing.
// (Another program may still be busy writing the file, or file
// writing may have been aborted prematurely.)
//---------------------------------------------------------------
bool isComplete () const;
//---------------------------------------------------------------
// Read pixel data:
//
// readPixels(s1,s2) reads all scan lines with y coordinates
// in the interval [min (s1, s2), max (s1, s2)] from the file,
// and stores them in the current frame buffer.
//
// Both s1 and s2 must be within the interval
// [header().dataWindow().min.y, header.dataWindow().max.y]
//
// The scan lines can be read from the file in random order, and
// individual scan lines may be skipped or read multiple times.
// For maximum efficiency, the scan lines should be read in the
// order in which they were written to the file.
//
// readPixels(s) calls readPixels(s,s).
//
// If threading is enabled, readPixels (s1, s2) tries to perform
// decopmression of multiple scanlines in parallel.
//
//---------------------------------------------------------------
void readPixels (int scanLine1, int scanLine2);
void readPixels (int scanLine);
//---------------------------------------------------------------
// Extract pixel data from pre-read block
//
// readPixels(rawPixelData,frameBuffer,s1,s2) reads all scan lines with y coordinates
// in the interval [min (s1, s2), max (s1, s2)] from the data provided and
// stores them in the provided frameBuffer.
// the data can be obtained from a call to rawPixelData()
//
//
// Both s1 and s2 must be within the data specified
//
// you must provide a frameBuffer with a samplecountslice, which must have been read
// and the data valid - readPixels uses your sample count buffer to compute
// offsets to the data it needs
//
// This call does not block, and is thread safe for clients with an existing
// threading model. The InputFile's frameBuffer is not used in this call.
//
// This call is only provided for clients which have an existing threading model in place
// and unpredictable access patterns to the data.
// The fastest way to read an entire image is to enable threading,use setFrameBuffer then
// readPixels(header().dataWindow().min.y, header.dataWindow().max.y)
//
//---------------------------------------------------------------
void readPixels (const char * rawPixelData,
const DeepFrameBuffer & frameBuffer,
int scanLine1,
int scanLine2) const;
//----------------------------------------------
// Read a block of raw pixel data from the file,
// without uncompressing it (this function is
// used to implement OutputFile::copyPixels()).
// note: returns the entire payload of the relevant chunk of data, not including part number
// including compressed and uncompressed sizes
// on entry, if pixelDataSize is insufficiently large, no bytes are read (pixelData can safely be NULL)
// on exit, pixelDataSize is the number of bytes required to read the chunk
//
//----------------------------------------------
void rawPixelData (int firstScanLine,
char * pixelData,
Int64 &pixelDataSize);
//-------------------------------------------------
// firstScanLineInChunk() returns the row number of the first row that's stored in the
// same chunk as scanline y. Depending on the compression mode, this may not be the same as y
//
// lastScanLineInChunk() returns the row number of the last row that's stored in the same
// chunk as scanline y. Depending on the compression mode, this may not be the same as y.
// The last chunk in the file may be smaller than all the others
//
//------------------------------------------------
int firstScanLineInChunk(int y) const;
int lastScanLineInChunk (int y) const;
//-----------------------------------------------------------
// Read pixel sample counts into a slice in the frame buffer.
//
// readPixelSampleCounts(s1, s2) reads all the counts of
// pixel samples with y coordinates in the interval
// [min (s1, s2), max (s1, s2)] from the file, and stores
// them in the slice naming "sample count".
//
// Both s1 and s2 must be within the interval
// [header().dataWindow().min.y, header.dataWindow().max.y]
//
// readPixelSampleCounts(s) calls readPixelSampleCounts(s,s).
//
//-----------------------------------------------------------
void readPixelSampleCounts (int scanline1,
int scanline2);
void readPixelSampleCounts (int scanline);
//----------------------------------------------------------
// Read pixel sample counts into the provided frameBuffer
// using a block read of data read by rawPixelData
// for multi-scanline compression schemes, you must decode the entire block
// so scanline1=firstScanLineInChunk(y) and scanline2=lastScanLineInChunk(y)
//
// This call does not block, and is thread safe for clients with an existing
// threading model. The InputFile's frameBuffer is not used in this call.
//
// The fastest way to read an entire image is to enable threading in OpenEXR, use setFrameBuffer then
// readPixelSampleCounts(header().dataWindow().min.y, header.dataWindow().max.y)
//
//----------------------------------------------------------
void readPixelSampleCounts (const char * rawdata ,
const DeepFrameBuffer & frameBuffer,
int scanLine1 ,
int scanLine2) const;
struct Data;
private:
Data * _data;
DeepScanLineInputFile (InputPartData* part);
void initialize(const Header& header);
void compatibilityInitialize(OPENEXR_IMF_INTERNAL_NAMESPACE::IStream & is);
void multiPartInitialize(InputPartData* part);
friend class InputFile;
friend class MultiPartInputFile;
friend void DeepScanLineOutputFile::copyPixels(DeepScanLineInputFile &);
};
OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT
#endif
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