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authorTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:17:53 -0500
committerTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:17:53 -0500
commitdda8474928bd7276e1fad8fb7a601e7c83ff2bc2 (patch)
tree7f83910598b33b12730035f086df20b5a53ab99c /tqtinterface/qt4/src/opengl/tqglcolormap.cpp
parent6260b6178868c03aab1644bf93b0ef043654bdb0 (diff)
downloadexperimental-dda8474928bd7276e1fad8fb7a601e7c83ff2bc2.tar.gz
experimental-dda8474928bd7276e1fad8fb7a601e7c83ff2bc2.zip
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+/****************************************************************************
+**
+** Implementation of TQGLColormap class
+**
+** Created : 20010326
+**
+** Copyright (C) 2010 Timothy Pearson and (C) 1992-2008 Trolltech ASA.
+**
+** This file is part of the opengl module of the TQt GUI Toolkit.
+**
+** This file may be used under the terms of the GNU General
+** Public License versions 2.0 or 3.0 as published by the Free
+** Software Foundation and appearing in the files LICENSE.GPL2
+** and LICENSE.GPL3 included in the packaging of this file.
+** Alternatively you may (at your option) use any later version
+** of the GNU General Public License if such license has been
+** publicly approved by Trolltech ASA (or its successors, if any)
+** and the KDE Free TQt Foundation.
+**
+** Please review the following information to ensure GNU General
+** Public Licensing requirements will be met:
+** http://trolltech.com/products/qt/licenses/licensing/opensource/.
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
+** or contact the sales department at sales@trolltech.com.
+**
+** This file may be used under the terms of the Q Public License as
+** defined by Trolltech ASA and appearing in the file LICENSE.TQPL
+** included in the packaging of this file. Licensees holding valid TQt
+** Commercial licenses may use this file in accordance with the TQt
+** Commercial License Agreement provided with the Software.
+**
+** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
+** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
+** herein.
+**
+**********************************************************************/
+
+/*!
+ \class TQGLColormap tqglcolormap.h
+ \brief The TQGLColormap class is used for installing custom colormaps into
+ TQGLWidgets.
+\if defined(commercial)
+ It is part of the <a href="commercialeditions.html">TQt Enterprise Edition</a>.
+\endif
+
+ \module OpenGL
+ \ingroup graphics
+ \ingroup images
+
+ TQGLColormap provides a platform independent way of specifying and
+ installing indexed colormaps into TQGLWidgets. TQGLColormap is
+ especially useful when using the \link opengl.html OpenGL\endlink
+ color-index mode.
+
+ Under X11 you must use an X server that supports either a \c
+ PseudoColor or \c DirectColor visual class. If your X server
+ currently only provides a \c GrayScale, \c TrueColor, \c
+ StaticColor or \c StaticGray visual, you will not be able to
+ allocate colorcells for writing. If this is the case, try setting
+ your X server to 8 bit mode. It should then provide you with at
+ least a \c PseudoColor visual. Note that you may experience
+ colormap flashing if your X server is running in 8 bit mode.
+
+ Under Windows the size of the colormap is always set to 256
+ colors. Note that under Windows you can also install colormaps
+ in child widgets.
+
+ This class uses explicit sharing (see \link shclass.html Shared
+ Classes\endlink).
+
+ Example of use:
+ \code
+ #include <tqapplication.h>
+ #include <tqglcolormap.h>
+
+ int main()
+ {
+ TQApplication a( argc, argv );
+
+ MySuperGLWidget widget( 0 ); // A TQGLWidget in color-index mode
+ TQGLColormap colormap;
+
+ // This will fill the colormap with colors ranging from
+ // black to white.
+ for ( int i = 0; i < colormap.size(); i++ )
+ colormap.setEntry( i, tqRgb( i, i, i ) );
+
+ widget.setColormap( colormap );
+ widget.show();
+ return a.exec();
+ }
+ \endcode
+
+ \sa TQGLWidget::setColormap(), TQGLWidget::colormap()
+*/
+
+#include "tqglcolormap.h"
+#include "tqmemarray.h"
+
+
+/*!
+ Construct a TQGLColormap.
+*/
+TQGLColormap::TQGLColormap()
+{
+ d = 0;
+}
+
+
+/*!
+ Construct a shallow copy of \a map.
+*/
+TQGLColormap::TQGLColormap( const TQGLColormap & map )
+{
+ d = map.d;
+ if ( d )
+ d->ref();
+}
+
+/*!
+ Dereferences the TQGLColormap and deletes it if this was the last
+ reference to it.
+*/
+TQGLColormap::~TQGLColormap()
+{
+ if ( d && d->deref() ) {
+ delete d;
+ d = 0;
+ }
+}
+
+/*!
+ Assign a shallow copy of \a map to this TQGLColormap.
+*/
+TQGLColormap & TQGLColormap::operator=( const TQGLColormap & map )
+{
+ if ( map.d != 0 )
+ map.d->ref();
+
+ if ( d && d->deref() )
+ delete d;
+ d = map.d;
+
+ return *this;
+}
+
+/*!
+ Detaches this TQGLColormap from the shared block.
+*/
+void TQGLColormap::detach()
+{
+ if ( d && d->count != 1 ) {
+ // ### What about the actual colormap handle?
+ Private * newd = new Private();
+ newd->cells = d->cells;
+ newd->cells.detach();
+ if ( d->deref() )
+ delete d;
+ d = newd;
+ }
+}
+
+/*!
+ Set cell at index \a idx in the colormap to color \a color.
+*/
+void TQGLColormap::setEntry( int idx, TQRgb color )
+{
+ if ( !d )
+ d = new Private();
+
+#if defined(TQT_CHECK_RANGE)
+ if ( idx < 0 || idx > (int) d->cells.size() ) {
+ qWarning( "TQGLColormap::setRgb: Index out of range." );
+ return;
+ }
+#endif
+ d->cells[ idx ] = color;
+}
+
+/*!
+ Set an array of cells in this colormap. \a count is the number of
+ colors that should be set, \a colors is the array of colors, and
+ \a base is the starting index.
+*/
+void TQGLColormap::setEntries( int count, const TQRgb * colors, int base )
+{
+ if ( !d )
+ d = new Private();
+
+ if ( !colors || base < 0 || base >= (int) d->cells.size() )
+ return;
+
+ for( int i = base; i < base + count; i++ ) {
+ if ( i < (int) d->cells.size() )
+ setEntry( i, colors[i] );
+ else
+ break;
+ }
+}
+
+/*!
+ Returns the TQRgb value in the colorcell with index \a idx.
+*/
+TQRgb TQGLColormap::entryRgb( int idx ) const
+{
+ if ( !d || idx < 0 || idx > (int) d->cells.size() )
+ return 0;
+ else
+ return d->cells[ idx ];
+}
+
+/*!
+ \overload
+
+ Set the cell with index \a idx in the colormap to color \a color.
+*/
+void TQGLColormap::setEntry( int idx, const TQColor & color )
+{
+ setEntry( idx, color.rgb() );
+}
+
+/*!
+ Returns the TQRgb value in the colorcell with index \a idx.
+*/
+TQColor TQGLColormap::entryColor( int idx ) const
+{
+ if ( !d || idx < 0 || idx > (int) d->cells.size() )
+ return TQColor();
+ else
+ return TQColor( d->cells[ idx ] );
+}
+
+/*!
+ Returns TRUE if the colormap is empty; otherwise returns FALSE. A
+ colormap with no color values set is considered to be empty.
+*/
+bool TQGLColormap::isEmpty() const
+{
+ return (d == 0) || (d->cells.size() == 0) || (d->cmapHandle == 0);
+}
+
+
+/*!
+ Returns the number of colorcells in the colormap.
+*/
+int TQGLColormap::size() const
+{
+ return d != 0 ? d->cells.size() : 0;
+}
+
+/*!
+ Returns the index of the color \a color. If \a color is not in the
+ map, -1 is returned.
+*/
+int TQGLColormap::tqfind( TQRgb color ) const
+{
+ if ( d )
+ return d->cells.tqfind( color );
+ return -1;
+}
+
+/*!
+ Returns the index of the color that is the closest match to color
+ \a color.
+*/
+int TQGLColormap::tqfindNearest( TQRgb color ) const
+{
+ int idx = tqfind( color );
+ if ( idx >= 0 )
+ return idx;
+ int mapSize = size();
+ int mindist = 200000;
+ int r = tqRed( color );
+ int g = tqGreen( color );
+ int b = tqBlue( color );
+ int rx, gx, bx, dist;
+ for ( int i=0; i < mapSize; i++ ) {
+ TQRgb ci = d->cells[i];
+ rx = r - tqRed( ci );
+ gx = g - tqGreen( ci );
+ bx = b - tqBlue( ci );
+ dist = rx*rx + gx*gx + bx*bx; // calculate distance
+ if ( dist < mindist ) { // minimal?
+ mindist = dist;
+ idx = i;
+ }
+ }
+ return idx;
+}