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cs440-acg/ext/openexr/OpenEXR/IlmImf/ImfScanLineInputFile.h

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+///////////////////////////////////////////////////////////////////////////
+//
+// 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.
+//
+///////////////////////////////////////////////////////////////////////////
+
+
+#ifndef INCLUDED_IMF_SCAN_LINE_INPUT_FILE_H
+#define INCLUDED_IMF_SCAN_LINE_INPUT_FILE_H
+
+//-----------------------------------------------------------------------------
+//
+//	class ScanLineInputFile
+//
+//-----------------------------------------------------------------------------
+
+#include "ImfHeader.h"
+#include "ImfFrameBuffer.h"
+#include "ImfThreading.h"
+#include "ImfInputStreamMutex.h"
+#include "ImfInputPartData.h"
+#include "ImfGenericInputFile.h"
+#include "ImfExport.h"
+#include "ImfNamespace.h"
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER
+
+
+class IMF_EXPORT ScanLineInputFile : public GenericInputFile
+{
+  public:
+
+    //------------
+    // Constructor
+    //------------
+
+    ScanLineInputFile (const Header &header, OPENEXR_IMF_INTERNAL_NAMESPACE::IStream *is,
+                       int numThreads = globalThreadCount());
+
+
+    //-----------------------------------------
+    // Destructor -- deallocates internal data
+    // structures, but does not close the file.
+    //-----------------------------------------
+
+    virtual ~ScanLineInputFile ();
+
+
+    //------------------------
+    // 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 FrameBuffer &frameBuffer);
+
+
+    //-----------------------------------
+    // Access to the current frame buffer
+    //-----------------------------------
+
+    const FrameBuffer &	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;
+
+    
+    
+    //---------------------------------------------------------------
+    // Check if SSE optimisation is enabled
+    //
+    // Call after setFrameBuffer() to query whether optimised file decoding
+    // is available - decode times will be faster if returns true
+    //
+    // Optimisation depends on the framebuffer channels and channel types
+    // as well as the file/part channels and channel types, as well as
+    // whether SSE2 instruction support was detected at compile time
+    //
+    // Calling before setFrameBuffer will throw an exception
+    //
+    //---------------------------------------------------------------
+    
+    bool                isOptimizationEnabled () 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);
+
+
+    //----------------------------------------------
+    // Read a block of raw pixel data from the file,
+    // without uncompressing it (this function is
+    // used to implement OutputFile::copyPixels()).
+    //----------------------------------------------
+
+    void		rawPixelData (int firstScanLine,
+				      const char *&pixelData,
+				      int &pixelDataSize);
+
+   
+    //----------------------------------------------
+    // Read a scanline's worth of raw pixel data 
+    // from the file, without uncompressing it, and 
+    // store in an external buffer, pixelData. 
+    // pixelData should be pre-allocated with space 
+    // for pixelDataSize chars. 
+    //
+    // This function can be used to separate the 
+    // reading of a raw scan line from the 
+    // decompression of that scan line, for
+    // example to allow multiple scan lines to be
+    // decompressed in parallel by an application's
+    // own threads, where it is not convenient to 
+    // use the threading within the library.
+    //----------------------------------------------
+
+    void                rawPixelDataToBuffer(int scanLine,
+					     char *pixelData,
+					     int &pixelDataSize) const;
+    
+  
+    struct Data;
+
+  private:
+
+    Data *		_data;
+
+    InputStreamMutex*   _streamData;
+
+    ScanLineInputFile   (InputPartData* part);
+
+    void                initialize(const Header& header);
+
+    friend class MultiPartInputFile;
+    friend class InputFile;
+};
+
+
+OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT
+
+
+
+
+
+#endif