253 lines
7.7 KiB
C++
253 lines
7.7 KiB
C++
///////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2002, 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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#ifndef INCLUDED_IMF_COMPRESSOR_H
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#define INCLUDED_IMF_COMPRESSOR_H
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//-----------------------------------------------------------------------------
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//
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// class Compressor
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//
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//-----------------------------------------------------------------------------
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#include <ImfCompression.h>
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#include "ImathBox.h"
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#include <stdlib.h>
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namespace Imf {
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class Header;
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class Compressor
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{
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public:
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//---------------------------------------------
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// Constructor -- hdr is the header of the file
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// that will be compressed or uncompressed
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//---------------------------------------------
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Compressor (const Header &hdr);
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//-----------
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// Destructor
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//-----------
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virtual ~Compressor ();
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//----------------------------------------------
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// Maximum number of scan lines processed by
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// a single call to compress() and uncompress().
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//----------------------------------------------
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virtual int numScanLines () const = 0;
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//--------------------------------------------
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// Format of the pixel data read and written
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// by the compress() and uncompress() methods.
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// The default implementation of format()
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// returns XDR.
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//--------------------------------------------
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enum Format
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{
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NATIVE, // the machine's native format
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XDR // Xdr format
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};
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virtual Format format () const;
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//----------------------------
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// Access to the file's header
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//----------------------------
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const Header & header () const {return _header;}
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//-------------------------------------------------------------------------
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// Compress an array of bytes that represents the contents of up to
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// numScanLines() scan lines:
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//
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// inPtr Input buffer (uncompressed data).
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//
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// inSize Number of bytes in the input buffer
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//
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// minY Minimum y coordinate of the scan lines to
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// be compressed
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//
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// outPtr Pointer to output buffer
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//
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// return value Size of compressed data in output buffer
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//
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// Arrangement of uncompressed pixel data in the input buffer:
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//
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// Before calling
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//
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// compress (buf, size, minY, ...);
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//
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// the InputFile::writePixels() method gathers pixel data from the
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// frame buffer, fb, and places them in buffer buf, like this:
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//
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// char *endOfBuf = buf;
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//
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// for (int y = minY;
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// y <= min (minY + numScanLines() - 1, header().dataWindow().max.y);
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// ++y)
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// {
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// for (ChannelList::ConstIterator c = header().channels().begin();
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// c != header().channels().end();
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// ++c)
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// {
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// if (modp (y, c.channel().ySampling) != 0)
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// continue;
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//
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// for (int x = header().dataWindow().min.x;
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// x <= header().dataWindow().max.x;
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// ++x)
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// {
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// if (modp (x, c.channel().xSampling) != 0)
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// continue;
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//
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// Xdr::write<CharPtrIO> (endOfBuf, fb.pixel (c, x, y));
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// }
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// }
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// }
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//
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// int size = endOfBuf - buf;
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//
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//-------------------------------------------------------------------------
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virtual int compress (const char *inPtr,
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int inSize,
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int minY,
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const char *&outPtr) = 0;
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virtual int compressTile (const char *inPtr,
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int inSize,
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Imath::Box2i range,
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const char *&outPtr);
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//-------------------------------------------------------------------------
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// Uncompress an array of bytes that has been compressed by compress():
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//
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// inPtr Input buffer (compressed data).
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//
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// inSize Number of bytes in the input buffer
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//
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// minY Minimum y coordinate of the scan lines to
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// be uncompressed
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//
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// outPtr Pointer to output buffer
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//
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// return value Size of uncompressed data in output buffer
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//
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//-------------------------------------------------------------------------
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virtual int uncompress (const char *inPtr,
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int inSize,
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int minY,
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const char *&outPtr) = 0;
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virtual int uncompressTile (const char *inPtr,
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int inSize,
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Imath::Box2i range,
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const char *&outPtr);
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private:
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const Header & _header;
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};
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//--------------------------------------
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// Test if c is a valid compression type
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//--------------------------------------
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bool isValidCompression (Compression c);
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//-----------------------------------------------------------------
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// Construct a Compressor for compression type c:
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//
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// maxScanLineSize Maximum number of bytes per uncompressed
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// scan line.
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//
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// header Header of the input or output file whose
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// pixels will be compressed or uncompressed.
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//
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// return value A pointer to a new Compressor object (it
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// is the caller's responsibility to delete
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// the object), or 0 (if c is NO_COMPRESSION).
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//
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//-----------------------------------------------------------------
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Compressor * newCompressor (Compression c,
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size_t maxScanLineSize,
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const Header &hdr);
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//-----------------------------------------------------------------
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// Construct a Compressor for compression type c for a tiled image:
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//
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// tileLineSize Maximum number of bytes per uncompressed
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// line in a tile.
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//
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// numTileLines Maximum number of lines in a tile.
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//
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// header Header of the input or output file whose
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// pixels will be compressed or uncompressed.
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//
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// return value A pointer to a new Compressor object (it
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// is the caller's responsibility to delete
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// the object), or 0 (if c is NO_COMPRESSION).
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//
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//-----------------------------------------------------------------
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Compressor * newTileCompressor (Compression c,
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size_t tileLineSize,
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size_t numTileLines,
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const Header &hdr);
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} // namespace Imf
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#endif
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