# kdefx Library API Documentation

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# kpixmap.cpp

    00001 /*
    00002  *  This file is part of the KDE libraries
    00003  *  Copyright (C) 1998  Mark Donohoe <donohoe@kde.org>
    00004  *          Stephan Kulow <coolo@kde.org>
    00005  *
    00006  *  $Id$
    00007  *
    00008  *  This library is free software; you can redistribute it and/or
    00009  *  modify it under the terms of the GNU Library General Public
    00010  *  License as published by the Free Software Foundation; either
    00011  *  version 2 of the License, or (at your option) any later version.
    00012  *
    00013  *  This library is distributed in the hope that it will be useful,
    00014  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
    00015  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00016  *  Library General Public License for more details.
    00017  *
    00018  *  You should have received a copy of the GNU Library General Public License
    00019  *  along with this library; see the file COPYING.LIB.  If not, write to
    00020  *  the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    00021  *  Boston, MA 02111-1307, USA.
    00022  */
    00023
    00024 #include <qpixmap.h>
    00025 #include <qpainter.h>
    00026 #include <qimage.h>
    00027 #include <qbitmap.h>
    00028 #include <qcolor.h>
    00029
    00030 #include <stdlib.h>
    00031 #include "kpixmap.h"
    00032
    00033 // Fast diffuse dither to 3x3x3 color cube
    00034 // Based on Qt's image conversion functions
    00035 static bool kdither_32_to_8( const QImage *src, QImage *dst )
    00036 {
    00037     // register QRgb *p;
    00038     uchar  *b;
    00039     int     y;
    00040
    00041     if ( !dst->create(src->width(), src->height(), 8, 256) ) {
    00042     qWarning("KPixmap: destination image not valid\n");
    00043     return false;
    00044     }
    00045
    00046     int ncols = 256;
    00047
    00048     static uint bm[16][16];
    00049     static int init=0;
    00050     if (!init) {
    00051
    00052     // Build a Bayer Matrix for dithering
    00053     init = 1;
    00054     int n, i, j;
    00055
    00056     bm[0][0]=0;
    00057
    00058     for (n=1; n<16; n*=2)
    00059         for (i=0; i<n; i++)
    00060         for (j=0; j<n; j++) {
    00061             bm[i][j]*=4;
    00062             bm[i+n][j]=bm[i][j]+2;
    00063             bm[i][j+n]=bm[i][j]+3;
    00064             bm[i+n][j+n]=bm[i][j]+1;
    00065         }
    00066
    00067     for (i=0; i<16; i++)
    00068         for (j=0; j<16; j++)
    00069         bm[i][j]<<=8;
    00070     }
    00071
    00072     dst->setNumColors( ncols );
    00073
    00074 #define MAX_R 2
    00075 #define MAX_G 2
    00076 #define MAX_B 2
    00077 #define INDEXOF(r,g,b) (((r)*(MAX_G+1)+(g))*(MAX_B+1)+(b))
    00078
    00079     int rc, gc, bc;
    00080
    00081     for ( rc=0; rc<=MAX_R; rc++ )       // build 2x2x2 color cube
    00082         for ( gc=0; gc<=MAX_G; gc++ )
    00083         for ( bc=0; bc<=MAX_B; bc++ ) {
    00084         dst->setColor( INDEXOF(rc,gc,bc),
    00085         qRgb( rc*255/MAX_R, gc*255/MAX_G, bc*255/MAX_B ) );
    00086         }
    00087
    00088     int sw = src->width();
    00089     int* line1[3];
    00090     int* line2[3];
    00091     int* pv[3];
    00092
    00093     line1[0] = new int[src->width()];
    00094     line2[0] = new int[src->width()];
    00095     line1[1] = new int[src->width()];
    00096     line2[1] = new int[src->width()];
    00097     line1[2] = new int[src->width()];
    00098     line2[2] = new int[src->width()];
    00099     pv[0] = new int[sw];
    00100     pv[1] = new int[sw];
    00101     pv[2] = new int[sw];
    00102
    00103     for ( y=0; y < src->height(); y++ ) {
    00104     // p = (QRgb *)src->scanLine(y);
    00105     b = dst->scanLine(y);
    00106     int endian = (QImage::systemBitOrder() == QImage::BigEndian);
    00107     int x;
    00108     uchar* q = src->scanLine(y);
    00109     uchar* q2 = src->scanLine(y+1 < src->height() ? y + 1 : 0);
    00110
    00111     for (int chan = 0; chan < 3; chan++) {
    00112         b = dst->scanLine(y);
    00113         int *l1 = (y&1) ? line2[chan] : line1[chan];
    00114         int *l2 = (y&1) ? line1[chan] : line2[chan];
    00115         if ( y == 0 ) {
    00116         for (int i=0; i<sw; i++)
    00117             l1[i] = q[i*4+chan+endian];
    00118         }
    00119         if ( y+1 < src->height() ) {
    00120         for (int i=0; i<sw; i++)
    00121             l2[i] = q2[i*4+chan+endian];
    00122         }
    00123
    00124         // Bi-directional error diffusion
    00125         if ( y&1 ) {
    00126         for (x=0; x<sw; x++) {
    00127             int pix = QMAX(QMIN(2, (l1[x] * 2 + 128)/ 255), 0);
    00128             int err = l1[x] - pix * 255 / 2;
    00129             pv[chan][x] = pix;
    00130
    00131             // Spread the error around...
    00132             if ( x+1<sw ) {
    00133             l1[x+1] += (err*7)>>4;
    00134             l2[x+1] += err>>4;
    00135             }
    00136             l2[x]+=(err*5)>>4;
    00137             if (x>1)
    00138             l2[x-1]+=(err*3)>>4;
    00139         }
    00140         } else {
    00141         for (x=sw; x-->0; ) {
    00142             int pix = QMAX(QMIN(2, (l1[x] * 2 + 128)/ 255), 0);
    00143             int err = l1[x] - pix * 255 / 2;
    00144             pv[chan][x] = pix;
    00145
    00146             // Spread the error around...
    00147             if ( x > 0 ) {
    00148             l1[x-1] += (err*7)>>4;
    00149             l2[x-1] += err>>4;
    00150             }
    00151             l2[x]+=(err*5)>>4;
    00152             if (x+1 < sw)
    00153             l2[x+1]+=(err*3)>>4;
    00154         }
    00155         }
    00156     }
    00157
    00158     if (!endian) {
    00159         for (x=0; x<sw; x++)
    00160         *b++ = INDEXOF(pv[2][x],pv[1][x],pv[0][x]);
    00161     } else {
    00162         for (x=0; x<sw; x++)
    00163         *b++ = INDEXOF(pv[0][x],pv[1][x],pv[2][x]);
    00164     }
    00165
    00166     }
    00167
    00168     delete [] line1[0];
    00169     delete [] line2[0];
    00170     delete [] line1[1];
    00171     delete [] line2[1];
    00172     delete [] line1[2];
    00173     delete [] line2[2];
    00174     delete [] pv[0];
    00175     delete [] pv[1];
    00176     delete [] pv[2];
    00177
    00178 #undef MAX_R
    00179 #undef MAX_G
    00180 #undef MAX_B
    00181 #undef INDEXOF
    00182
    00183     return true;
    00184 }
    00185
    00186 KPixmap::~KPixmap()
    00187 {
    00188 }
    00189
    00190 bool KPixmap::load( const QString& fileName, const char *format,
    00191             int conversion_flags )
    00192 {
    00193     QImageIO io( fileName, format );
    00194
    00195     bool result = io.read();
    00196
    00197     if ( result ) {
    00198     detach();
    00199     result = convertFromImage( io.image(), conversion_flags );
    00200     }
    00201     return result;
    00202 }
    00203
    00204 bool KPixmap::load( const QString& fileName, const char *format,
    00205             ColorMode mode )
    00206 {
    00207     int conversion_flags = 0;
    00208     switch (mode) {
    00209     case Color:
    00210     conversion_flags |= ColorOnly;
    00211     break;
    00212     case Mono:
    00213     conversion_flags |= MonoOnly;
    00214     break;
    00215     case LowColor:
    00216     conversion_flags |= LowOnly;
    00217     break;
    00218     case WebColor:
    00219     conversion_flags |= WebOnly;
    00220     break;
    00221     default:
    00222     break;// Nothing.
    00223     }
    00224     return load( fileName, format, conversion_flags );
    00225 }
    00226
    00227 bool KPixmap::convertFromImage( const QImage &img, ColorMode mode )
    00228 {
    00229     int conversion_flags = 0;
    00230     switch (mode) {
    00231     case Color:
    00232     conversion_flags |= ColorOnly;
    00233     break;
    00234     case Mono:
    00235     conversion_flags |= MonoOnly;
    00236     break;
    00237     case LowColor:
    00238     conversion_flags |= LowOnly;
    00239     break;
    00240     case WebColor:
    00241     conversion_flags |= WebOnly;
    00242     break;
    00243     default:
    00244     break;  // Nothing.
    00245     }
    00246     return convertFromImage( img, conversion_flags );
    00247 }
    00248
    00249 bool KPixmap::convertFromImage( const QImage &img, int conversion_flags  )
    00250 {
    00251     if ( img.isNull() ) {
    00252 #if defined(CHECK_NULL)
    00253     qWarning( "KPixmap::convertFromImage: Cannot convert a null image" );
    00254 #endif
    00255     return false;
    00256     }
    00257     detach();                   // detach other references
    00258
    00259     int dd = defaultDepth();
    00260
    00261     // If color mode not one of KPixmaps extra modes nothing to do
    00262     if ( ( conversion_flags & KColorMode_Mask ) != LowOnly &&
    00263      ( conversion_flags & KColorMode_Mask ) != WebOnly ) {
    00264         return QPixmap::convertFromImage ( img, conversion_flags );
    00265     }
    00266
    00267     // If the default pixmap depth is not 8bpp, KPixmap color modes have no
    00268     // effect. Ignore them and use AutoColor instead.
    00269     if ( dd > 8 ) {
    00270     if ( ( conversion_flags & KColorMode_Mask ) == LowOnly ||
    00271          ( conversion_flags & KColorMode_Mask ) == WebOnly )
    00272         conversion_flags = (conversion_flags & ~KColorMode_Mask) | Auto;
    00273     return QPixmap::convertFromImage ( img, conversion_flags );
    00274     }
    00275
    00276     if ( ( conversion_flags & KColorMode_Mask ) == LowOnly ) {
    00277     // Here we skimp a little on the possible conversion modes
    00278     // Don't offer ordered or threshold dither of RGB channels or
    00279     // diffuse or ordered dither of alpha channel. It hardly seems
    00280     // worth the effort for this specialized mode.
    00281
    00282     // If image uses icon palette don't dither it.
    00283     if( img.numColors() > 0 && img.numColors() <=40 ) {
    00284         if ( checkColorTable( img ) )
    00285         return QPixmap::convertFromImage( img, QPixmap::Auto );
    00286     }
    00287
    00288     QBitmap mask;
    00289     bool isMask = false;
    00290
    00291     QImage  image = img.convertDepth(32);
    00292     QImage tImage( image.width(), image.height(), 8, 256 );
    00293
    00294     if( img.hasAlphaBuffer() ) {
    00295         image.setAlphaBuffer( true );
    00296         tImage.setAlphaBuffer( true );
    00297         isMask = mask.convertFromImage( img.createAlphaMask() );
    00298     }
    00299
    00300     kdither_32_to_8( &image, &tImage );
    00301
    00302     if( QPixmap::convertFromImage( tImage ) ) {
    00303         if ( isMask ) QPixmap::setMask( mask );
    00304         return true;
    00305     } else
    00306         return false;
    00307     } else {
    00308     QImage  image = img.convertDepth( 32 );
    00309     image.setAlphaBuffer( img.hasAlphaBuffer() );
    00310     conversion_flags = (conversion_flags & ~ColorMode_Mask) | Auto;
    00311     return QPixmap::convertFromImage ( image, conversion_flags );
    00312     }
    00313 }
    00314
    00315 static QColor* kpixmap_iconPalette = 0;
    00316
    00317 bool KPixmap::checkColorTable( const QImage &image )
    00318 {
    00319     int i = 0;
    00320
    00321     if (kpixmap_iconPalette == 0) {
    00322     kpixmap_iconPalette = new QColor[40];
    00323
    00324     // Standard palette
    00325     kpixmap_iconPalette[i++] = red;
    00326     kpixmap_iconPalette[i++] = green;
    00327     kpixmap_iconPalette[i++] = blue;
    00328     kpixmap_iconPalette[i++] = cyan;
    00329     kpixmap_iconPalette[i++] = magenta;
    00330     kpixmap_iconPalette[i++] = yellow;
    00331     kpixmap_iconPalette[i++] = darkRed;
    00332     kpixmap_iconPalette[i++] = darkGreen;
    00333     kpixmap_iconPalette[i++] = darkBlue;
    00334     kpixmap_iconPalette[i++] = darkCyan;
    00335     kpixmap_iconPalette[i++] = darkMagenta;
    00336     kpixmap_iconPalette[i++] = darkYellow;
    00337     kpixmap_iconPalette[i++] = white;
    00338     kpixmap_iconPalette[i++] = lightGray;
    00339     kpixmap_iconPalette[i++] = gray;
    00340     kpixmap_iconPalette[i++] = darkGray;
    00341     kpixmap_iconPalette[i++] = black;
    00342
    00343     // Pastels
    00344     kpixmap_iconPalette[i++] = QColor( 255, 192, 192 );
    00345     kpixmap_iconPalette[i++] = QColor( 192, 255, 192 );
    00346     kpixmap_iconPalette[i++] = QColor( 192, 192, 255 );
    00347     kpixmap_iconPalette[i++] = QColor( 255, 255, 192 );
    00348     kpixmap_iconPalette[i++] = QColor( 255, 192, 255 );
    00349     kpixmap_iconPalette[i++] = QColor( 192, 255, 255 );
    00350
    00351     // Reds
    00352     kpixmap_iconPalette[i++] = QColor( 64,   0,   0 );
    00353     kpixmap_iconPalette[i++] = QColor( 192,  0,   0 );
    00354
    00355     // Oranges
    00356     kpixmap_iconPalette[i++] = QColor( 255, 128,   0 );
    00357     kpixmap_iconPalette[i++] = QColor( 192,  88,   0 );
    00358     kpixmap_iconPalette[i++] = QColor( 255, 168,  88 );
    00359     kpixmap_iconPalette[i++] = QColor( 255, 220, 168 );
    00360
    00361     // Blues
    00362     kpixmap_iconPalette[i++] = QColor(   0,   0, 192 );
    00363
    00364     // Turquoise
    00365     kpixmap_iconPalette[i++] = QColor(   0,  64,  64 );
    00366     kpixmap_iconPalette[i++] = QColor(   0, 192, 192 );
    00367
    00368     // Yellows
    00369     kpixmap_iconPalette[i++] = QColor(  64,  64,   0 );
    00370     kpixmap_iconPalette[i++] = QColor( 192, 192,   0 );
    00371
    00372     // Greens
    00373     kpixmap_iconPalette[i++] = QColor(   0,  64,   0 );
    00374     kpixmap_iconPalette[i++] = QColor(   0, 192,   0 );
    00375
    00376     // Purples
    00377     kpixmap_iconPalette[i++] = QColor( 192,   0, 192 );
    00378
    00379     // Greys
    00380     kpixmap_iconPalette[i++] = QColor(  88,  88,  88 );
    00381     kpixmap_iconPalette[i++] = QColor(  48,  48,  48 );
    00382     kpixmap_iconPalette[i++] = QColor( 220, 220, 220 );
    00383
    00384     }
    00385
    00386     QRgb* ctable = image.colorTable();
    00387
    00388     int ncols = image.numColors();
    00389     int j;
    00390
    00391     // Allow one failure which could be transparent background
    00392     int failures = 0;
    00393
    00394     for ( i=0; i<ncols; i++ ) {
    00395     for ( j=0; j<40; j++ ) {
    00396         if ( kpixmap_iconPalette[j].red() == qRed( ctable[i] ) &&
    00397          kpixmap_iconPalette[j].green() == qGreen( ctable[i] ) &&
    00398          kpixmap_iconPalette[j].blue() == qBlue( ctable[i] ) ) {
    00399         break;
    00400         }
    00401     }
    00402
    00403     if ( j == 40 ) {
    00404         failures ++;
    00405     }
    00406     }
    00407
    00408     return ( failures <= 1 );
    00409
    00410 }
    00411
    00412 KPixmap::KPixmap(const QPixmap& p)
    00413     : QPixmap(p)
    00414 {
    00415 }

This file is part of the documentation for kdefx Library Version 3.4.1.
Documentation copyright © 1996-2004 the KDE developers.
Generated on Sat Jun 11 20:17:09 2005 by doxygen 1.4.1 written by Dimitri van Heesch, © 1997-2003