imftiledrgbafile.cpp

对gif

///////////////////////////////////////////////////////////////////////////
//
// 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,
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// 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 TiledRgbaOutputFile
//	class TiledRgbaInputFile
//
//-----------------------------------------------------------------------------

#include <ImfTiledRgbaFile.h>
#include <ImfRgbaFile.h>
#include <ImfTiledOutputFile.h>
#include <ImfTiledInputFile.h>
#include <ImfChannelList.h>
#include <ImfTileDescriptionAttribute.h>
#include <ImfStandardAttributes.h>
#include <ImfRgbaYca.h>
#include <ImfArray.h>
#include "IlmThreadMutex.h"
#include "Iex.h"


namespace Imf {

using namespace Imath;
using namespace RgbaYca;
using namespace IlmThread;

namespace {

void
insertChannels (Header &header,
		RgbaChannels rgbaChannels,
		const char fileName[])
{
    ChannelList ch;

    if (rgbaChannels & (WRITE_Y | WRITE_C))
    {
	if (rgbaChannels & WRITE_Y)
	{
	    ch.insert ("Y", Channel (HALF, 1, 1));
	}

	if (rgbaChannels & WRITE_C)
	{
	    THROW (Iex::ArgExc, "Cannot open file \"" << fileName << "\" "
				"for writing.  Tiled image files do not "
				"support subsampled chroma channels.");
	}
    }
    else
    {
	if (rgbaChannels & WRITE_R)
	    ch.insert ("R", Channel (HALF, 1, 1));

	if (rgbaChannels & WRITE_G)
	    ch.insert ("G", Channel (HALF, 1, 1));

	if (rgbaChannels & WRITE_B)
	    ch.insert ("B", Channel (HALF, 1, 1));
    }

    if (rgbaChannels & WRITE_A)
	ch.insert ("A", Channel (HALF, 1, 1));

    header.channels() = ch;
}


RgbaChannels
rgbaChannels (const ChannelList &ch)
{
    int i = 0;

    if (ch.findChannel ("R"))
	i |= WRITE_R;

    if (ch.findChannel ("G"))
	i |= WRITE_G;
    
    if (ch.findChannel ("B"))
	i |= WRITE_B;

    if (ch.findChannel ("A"))
	i |= WRITE_A;

    if (ch.findChannel ("Y"))
	i |= WRITE_Y;

    return RgbaChannels (i);
}


V3f
ywFromHeader (const Header &header)
{
    Chromaticities cr;

    if (hasChromaticities (header))
	cr = chromaticities (header);

    return computeYw (cr);
}

} // namespace


class TiledRgbaOutputFile::ToYa: public Mutex
{
  public:

     ToYa (TiledOutputFile &outputFile, RgbaChannels rgbaChannels);

     void	setFrameBuffer (const Rgba *base,
				size_t xStride,
				size_t yStride);

     void	writeTile (int dx, int dy, int lx, int ly);

  private:

     TiledOutputFile &	_outputFile;
     bool		_writeA;
     unsigned int	_tileXSize;
     unsigned int	_tileYSize;
     V3f		_yw;
     Array2D <Rgba>	_buf;
     const Rgba *	_fbBase;
     size_t		_fbXStride;
     size_t		_fbYStride;
};


TiledRgbaOutputFile::ToYa::ToYa (TiledOutputFile &outputFile,
				 RgbaChannels rgbaChannels)
:
    _outputFile (outputFile)
{
    _writeA = (rgbaChannels & WRITE_A)? true: false;
    
    const TileDescription &td = outputFile.header().tileDescription();

    _tileXSize = td.xSize;
    _tileYSize = td.ySize;
    _yw = ywFromHeader (_outputFile.header());
    _buf.resizeErase (_tileYSize, _tileXSize);
    _fbBase = 0;
    _fbXStride = 0;
    _fbYStride = 0;
}


void
TiledRgbaOutputFile::ToYa::setFrameBuffer (const Rgba *base,
					   size_t xStride,
					   size_t yStride)
{
    _fbBase = base;
    _fbXStride = xStride;
    _fbYStride = yStride;
}


void
TiledRgbaOutputFile::ToYa::writeTile (int dx, int dy, int lx, int ly)
{
    if (_fbBase == 0)
    {
	THROW (Iex::ArgExc, "No frame buffer was specified as the "
			    "pixel data source for image file "
			    "\"" << _outputFile.fileName() << "\".");
    }

    //
    // Copy the tile's RGBA pixels into _buf and convert
    // them to luminance/alpha format
    //

    Box2i dw = _outputFile.dataWindowForTile (dx, dy, lx, ly);
    int width = dw.max.x - dw.min.x + 1;

    for (int y = dw.min.y, y1 = 0; y <= dw.max.y; ++y, ++y1)
    {
	for (int x = dw.min.x, x1 = 0; x <= dw.max.x; ++x, ++x1)
	    _buf[y1][x1] = _fbBase[x * _fbXStride + y * _fbYStride];

	RGBAtoYCA (_yw, width, _writeA, _buf[y1], _buf[y1]);
    }

    //
    // Store the contents of _buf in the output file
    //

    FrameBuffer fb;

    fb.insert ("Y", Slice (HALF,				   // type
			   (char *) &_buf[-dw.min.y][-dw.min.x].g, // base
			   sizeof (Rgba),			   // xStride
			   sizeof (Rgba) * _tileXSize));	   // yStride

    fb.insert ("A", Slice (HALF,				   // type
			   (char *) &_buf[-dw.min.y][-dw.min.x].a, // base
			   sizeof (Rgba),			   // xStride
			   sizeof (Rgba) * _tileXSize));	   // yStride

    _outputFile.setFrameBuffer (fb);
    _outputFile.writeTile (dx, dy, lx, ly);
}


TiledRgbaOutputFile::TiledRgbaOutputFile
    (const char name[],
     const Header &header,
     RgbaChannels rgbaChannels,
     int tileXSize,
     int tileYSize,
     LevelMode mode,
     LevelRoundingMode rmode,
     int numThreads)
:
    _outputFile (0),
    _toYa (0)
{
    Header hd (header);
    insertChannels (hd, rgbaChannels, name);
    hd.setTileDescription (TileDescription (tileXSize, tileYSize, mode, rmode));
    _outputFile = new TiledOutputFile (name, hd, numThreads);

    if (rgbaChannels & WRITE_Y)
	_toYa = new ToYa (*_outputFile, rgbaChannels);
}



TiledRgbaOutputFile::TiledRgbaOutputFile
    (OStream &os,
     const Header &header,
     RgbaChannels rgbaChannels,
     int tileXSize,
     int tileYSize,
     LevelMode mode,
     LevelRoundingMode rmode,
     int numThreads)
:
    _outputFile (0),
    _toYa (0)
{
    Header hd (header);
    insertChannels (hd, rgbaChannels, os.fileName());
    hd.setTileDescription (TileDescription (tileXSize, tileYSize, mode, rmode));
    _outputFile = new TiledOutputFile (os, hd, numThreads);

    if (rgbaChannels & WRITE_Y)
	_toYa = new ToYa (*_outputFile, rgbaChannels);
}



TiledRgbaOutputFile::TiledRgbaOutputFile
    (const char name[],
     int tileXSize,
     int tileYSize,
     LevelMode mode,
     LevelRoundingMode rmode,
     const Imath::Box2i &displayWindow,
     const Imath::Box2i &dataWindow,
     RgbaChannels rgbaChannels,
     float pixelAspectRatio,
     const Imath::V2f screenWindowCenter,
     float screenWindowWidth,
     LineOrder lineOrder,
     Compression compression,
     int numThreads)
:
    _outputFile (0),
    _toYa (0)
{
    Header hd (displayWindow,
	       dataWindow.isEmpty()? displayWindow: dataWindow,
	       pixelAspectRatio,
	       screenWindowCenter,
	       screenWindowWidth,
	       lineOrder,
	       compression);

    insertChannels (hd, rgbaChannels, name);
    hd.setTileDescription (TileDescription (tileXSize, tileYSize, mode, rmode));
    _outputFile = new TiledOutputFile (name, hd, numThreads);

    if (rgbaChannels & WRITE_Y)
	_toYa = new ToYa (*_outputFile, rgbaChannels);
}


TiledRgbaOutputFile::TiledRgbaOutputFile
    (const char name[],
     int width,
     int height,
     int tileXSize,
     int tileYSize,
     LevelMode mode,
     LevelRoundingMode rmode,
     RgbaChannels rgbaChannels,
     float pixelAspectRatio,
     const Imath::V2f screenWindowCenter,
     float screenWindowWidth,
     LineOrder lineOrder,
     Compression compression,
     int numThreads)
:
    _outputFile (0),
    _toYa (0)
{
    Header hd (width,
	       height,
	       pixelAspectRatio,
	       screenWindowCenter,
	       screenWindowWidth,
	       lineOrder,
	       compression);

    insertChannels (hd, rgbaChannels, name);
    hd.setTileDescription (TileDescription (tileXSize, tileYSize, mode, rmode));
    _outputFile = new TiledOutputFile (name, hd, numThreads);

    if (rgbaChannels & WRITE_Y)
	_toYa = new ToYa (*_outputFile, rgbaChannels);
}


TiledRgbaOutputFile::~TiledRgbaOutputFile ()
{
    delete _outputFile;
    delete _toYa;
}


void
TiledRgbaOutputFile::setFrameBuffer (const Rgba *base,
				     size_t xStride,
				     size_t yStride)
{
    if (_toYa)
    {
	Lock lock (*_toYa);
	_toYa->setFrameBuffer (base, xStride, yStride);
    }
    else
    {
	size_t xs = xStride * sizeof (Rgba);
	size_t ys = yStride * sizeof (Rgba);

	FrameBuffer fb;

	fb.insert ("R", Slice (HALF, (char *) &base[0].r, xs, ys));
	fb.insert ("G", Slice (HALF, (char *) &base[0].g, xs, ys));
	fb.insert ("B", Slice (HALF, (char *) &base[0].b, xs, ys));
	fb.insert ("A", Slice (HALF, (char *) &base[0].a, xs, ys));

	_outputFile->setFrameBuffer (fb);
    }
}


const Header &
TiledRgbaOutputFile::header () const
{
    return _outputFile->header();
}


const FrameBuffer &
TiledRgbaOutputFile::frameBuffer () const
{
    return _outputFile->frameBuffer();
}


const Imath::Box2i &
TiledRgbaOutputFile::displayWindow () const
{
    return _outputFile->header().displayWindow();
}


const Imath::Box2i &
TiledRgbaOutputFile::dataWindow () const
{
    return _outputFile->header().dataWindow();
}


float	
TiledRgbaOutputFile::pixelAspectRatio () const
{
    return _outputFile->header().pixelAspectRatio();
}


const Imath::V2f
TiledRgbaOutputFile::screenWindowCenter () const
{
    return _outputFile->header().screenWindowCenter();
}


float	
TiledRgbaOutputFile::screenWindowWidth () const
{
    return _outputFile->header().screenWindowWidth();
}


LineOrder
TiledRgbaOutputFile::lineOrder () const
{
    return _outputFile->header().lineOrder();
}


Compression
TiledRgbaOutputFile::compression () const
{
    return _outputFile->header().compression();
}


RgbaChannels
TiledRgbaOutputFile::channels () const
{
    return rgbaChannels (_outputFile->header().channels());
}


unsigned int
TiledRgbaOutputFile::tileXSize () const
{
     return _outputFile->tileXSize();
}


unsigned int
TiledRgbaOutputFile::tileYSize () const
{
     return _outputFile->tileYSize();
}


LevelMode
TiledRgbaOutputFile::levelMode () const
{
     return _outputFile->levelMode();
}


LevelRoundingMode
TiledRgbaOutputFile::levelRoundingMode () const
{
     return _outputFile->levelRoundingMode();
}


int
TiledRgbaOutputFile::numLevels () const
{
     return _outputFile->numLevels();
}


int
TiledRgbaOutputFile::numXLevels () const
{
     return _outputFile->numXLevels();
}


int
TiledRgbaOutputFile::numYLevels () const
{
     return _outputFile->numYLevels();
}


bool
TiledRgbaOutputFile::isValidLevel (int lx, int ly) const
{
    return _outputFile->isValidLevel (lx, ly);
}


int
TiledRgbaOutputFile::levelWidth (int lx) const
{
     return _outputFile->levelWidth (lx);
}


int
TiledRgbaOutputFile::levelHeight (int ly) const
{
     return _outputFile->levelHeight (ly);
}


int
TiledRgbaOutputFile::numXTiles (int lx) const
{
     return _outputFile->numXTiles (lx);
}


int