/*************************************************************************** qcolor.cpp (c) 2000-2013 Benoît Minisini This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. ***************************************************************************/ /**************************************************************************** ** $Id: qt/qcolor.cpp 3.3.4 edited Dec 22 17:04 $ ** ** Implementation of QColor class ** ** Created : 940112 ** ** Copyright (C) 1992-2002 Trolltech AS. All rights reserved. ** ** This file is part of the kernel module of the Qt GUI Toolkit. ** ** This file may be distributed under the terms of the Q Public License ** as defined by Trolltech AS of Norway and appearing in the file ** LICENSE.QPL included in the packaging of this file. ** ** This file may be distributed and/or modified under the terms of the ** GNU General Public License version 2 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. ** ** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition ** licenses may use this file in accordance with the Qt Commercial License ** Agreement provided with the Software. ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ** ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for ** information about Qt Commercial License Agreements. ** See http://www.trolltech.com/qpl/ for QPL licensing information. ** See http://www.trolltech.com/gpl/ for GPL licensing information. ** ** Contact info@trolltech.com if any conditions of this licensing are ** not clear to you. ** **********************************************************************/ #include "qcolor.h" //#include "qnamespace.h" //#include "qdatastream.h" #include /*! \class QColor qcolor.h \brief The QColor class provides colors based on RGB or HSV values. \ingroup images \ingroup graphics \ingroup appearance A color is normally specified in terms of RGB (red, green and blue) components, but it is also possible to specify HSV (hue, saturation and value) or set a color name (the names are copied from from the X11 color database). In addition to the RGB value, a QColor also has a pixel value and a validity. The pixel value is used by the underlying window system to refer to a color. It can be thought of as an index into the display hardware's color table. The validity (isValid()) indicates whether the color is legal at all. For example, a RGB color with RGB values out of range is illegal. For performance reasons, QColor mostly disregards illegal colors. The result of using an invalid color is unspecified and will usually be surprising. There are 19 predefined QColor objects: \c white, \c black, \c red, \c darkRed, \c green, \c darkGreen, \c blue, \c darkBlue, \c cyan, \c darkCyan, \c magenta, \c darkMagenta, \c yellow, \c darkYellow, \c gray, \c darkGray, \c lightGray, \c color0 and \c color1, accessible as members of the Qt namespace (ie. \c Qt::red). \img qt-colors.png Qt Colors The colors \c color0 (zero pixel value) and \c color1 (non-zero pixel value) are special colors for drawing in \link QBitmap bitmaps\endlink. Painting with \c color0 sets the bitmap bits to 0 (transparent, i.e. background), and painting with \c color1 sets the bits to 1 (opaque, i.e. foreground). The QColor class has an efficient, dynamic color allocation strategy. A color is normally allocated the first time it is used (lazy allocation), that is, whenever the pixel() function is called. The following steps are taken to allocate a color. If, at any point, a suitable color is found then the appropriate pixel value is returned and the subsequent steps are not taken: \list 1 \i Is the pixel value valid? If it is, just return it; otherwise, allocate a pixel value. \i Check an internal hash table to see if we allocated an equal RGB value earlier. If we did, set the corresponding pixel value for the color and return it. \i Try to allocate the RGB value. If we succeed, we get a pixel value that we save in the internal table with the RGB value. Return the pixel value. \i The color could not be allocated. Find the closest matching color, save it in the internal table, and return it. \endlist A color can be set by passing setNamedColor() an RGB string like "#112233", or a color name, e.g. "blue". The names are taken from X11's rgb.txt database but can also be used under Windows. To get a lighter or darker color use light() and dark() respectively. Colors can also be set using setRgb() and setHsv(). The color components can be accessed in one go with rgb() and hsv(), or individually with red(), green() and blue(). Use maxColors() and numBitPlanes() to determine the maximum number of colors and the number of bit planes supported by the underlying window system, If you need to allocate many colors temporarily, for example in an image viewer application, enterAllocContext(), leaveAllocContext() and destroyAllocContext() will prove useful. \section1 HSV Colors Because many people don't know the HSV color model very well, we'll cover it briefly here. The RGB model is hardware-oriented. Its representation is close to what most monitors show. In contrast, HSV represents color in a way more suited to the human perception of color. For example, the relationships "stronger than", "darker than" and "the opposite of" are easily expressed in HSV but are much harder to express in RGB. HSV, like RGB, has three components: \list \i H, for hue, is either 0-359 if the color is chromatic (not gray), or meaningless if it is gray. It represents degrees on the color wheel familiar to most people. Red is 0 (degrees), green is 120 and blue is 240. \i S, for saturation, is 0-255, and the bigger it is, the stronger the color is. Grayish colors have saturation near 0; very strong colors have saturation near 255. \i V, for value, is 0-255 and represents lightness or brightness of the color. 0 is black; 255 is as far from black as possible. \endlist Here are some examples: Pure red is H=0, S=255, V=255. A dark red, moving slightly towards the magenta, could be H=350 (equivalent to -10), S=255, V=180. A grayish light red could have H about 0 (say 350-359 or 0-10), S about 50-100, and S=255. Qt returns a hue value of -1 for achromatic colors. If you pass a too-big hue value, Qt forces it into range. Hue 360 or 720 is treated as 0; hue 540 is treated as 180. \sa QPalette, QColorGroup, QApplication::setColorSpec(), \link http://www.inforamp.net/~poynton/Poynton-color.html Color FAQ\endlink */ /***************************************************************************** Global colors *****************************************************************************/ #if defined(Q_WS_WIN) #define COLOR0_PIX 0x00ffffff #define COLOR1_PIX 0 #else #define COLOR0_PIX 0 #define COLOR1_PIX 1 #endif #if 0 static QColor stdcol[19]; QT_STATIC_CONST_IMPL QColor & Qt::color0 = stdcol[0]; QT_STATIC_CONST_IMPL QColor & Qt::color1 = stdcol[1]; QT_STATIC_CONST_IMPL QColor & Qt::black = stdcol[2]; QT_STATIC_CONST_IMPL QColor & Qt::white = stdcol[3]; QT_STATIC_CONST_IMPL QColor & Qt::darkGray = stdcol[4]; QT_STATIC_CONST_IMPL QColor & Qt::gray = stdcol[5]; QT_STATIC_CONST_IMPL QColor & Qt::lightGray = stdcol[6]; QT_STATIC_CONST_IMPL QColor & Qt::red = stdcol[7]; QT_STATIC_CONST_IMPL QColor & Qt::green = stdcol[8]; QT_STATIC_CONST_IMPL QColor & Qt::blue = stdcol[9]; QT_STATIC_CONST_IMPL QColor & Qt::cyan = stdcol[10]; QT_STATIC_CONST_IMPL QColor & Qt::magenta = stdcol[11]; QT_STATIC_CONST_IMPL QColor & Qt::yellow = stdcol[12]; QT_STATIC_CONST_IMPL QColor & Qt::darkRed = stdcol[13]; QT_STATIC_CONST_IMPL QColor & Qt::darkGreen = stdcol[14]; QT_STATIC_CONST_IMPL QColor & Qt::darkBlue = stdcol[15]; QT_STATIC_CONST_IMPL QColor & Qt::darkCyan = stdcol[16]; QT_STATIC_CONST_IMPL QColor & Qt::darkMagenta = stdcol[17]; QT_STATIC_CONST_IMPL QColor & Qt::darkYellow = stdcol[18]; #endif /***************************************************************************** QColor member functions *****************************************************************************/ bool QColor::color_init = FALSE; // color system not initialized bool QColor::globals_init = FALSE; // global color not initialized QColor::ColorModel QColor::colormodel = d32; #if 0 QColor* QColor::globalColors() { return stdcol; } #endif /*! Initializes the global colors. This function is called if a global color variable is initialized before the constructors for our global color objects are executed. Without this mechanism, assigning a color might assign an uninitialized value. Example: \code QColor myColor = red; // will initialize red etc. int main( int argc, char **argc ) { } \endcode */ #if 0 void QColor::initGlobalColors() { globals_init = TRUE; #if 0 #ifdef Q_WS_X11 // HACK: we need a way to recognize color0 and color1 uniquely, so // that we can use color0 and color1 with fixed pixel values on // all screens stdcol[ 0].d.argb = qRgba(255, 255, 255, 1); stdcol[ 1].d.argb = qRgba( 0, 0, 0, 1); #else stdcol[ 0].d.argb = qRgb(255,255,255); stdcol[ 1].d.argb = 0; #endif // Q_WS_X11 stdcol[ 0].setPixel( COLOR0_PIX ); stdcol[ 1].setPixel( COLOR1_PIX ); // From the "The Palette Manager: How and Why" by Ron Gery, March 23, // 1992, archived on MSDN: // The Windows system palette is broken up into two sections, // one with fixed colors and one with colors that can be changed // by applications. The system palette predefines 20 entries; // these colors are known as the static or reserved colors and // consist of the 16 colors found in the Windows version 3.0 VGA // driver and 4 additional colors chosen for their visual appeal. // The DEFAULT_PALETTE stock object is, as the name implies, the // default palette selected into a device context (DC) and consists // of these static colors. Applications can set the remaining 236 // colors using the Palette Manager. // The 20 reserved entries have indices in [0,9] and [246,255]. We // reuse 17 of them. stdcol[ 2].setRgb( 0, 0, 0 ); // index 0 black stdcol[ 3].setRgb( 255, 255, 255 ); // index 255 white stdcol[ 4].setRgb( 128, 128, 128 ); // index 248 medium gray stdcol[ 5].setRgb( 160, 160, 164 ); // index 247 light gray stdcol[ 6].setRgb( 192, 192, 192 ); // index 7 light gray stdcol[ 7].setRgb( 255, 0, 0 ); // index 249 red stdcol[ 8].setRgb( 0, 255, 0 ); // index 250 green stdcol[ 9].setRgb( 0, 0, 255 ); // index 252 blue stdcol[10].setRgb( 0, 255, 255 ); // index 254 cyan stdcol[11].setRgb( 255, 0, 255 ); // index 253 magenta stdcol[12].setRgb( 255, 255, 0 ); // index 251 yellow stdcol[13].setRgb( 128, 0, 0 ); // index 1 dark red stdcol[14].setRgb( 0, 128, 0 ); // index 2 dark green stdcol[15].setRgb( 0, 0, 128 ); // index 4 dark blue stdcol[16].setRgb( 0, 128, 128 ); // index 6 dark cyan stdcol[17].setRgb( 128, 0, 128 ); // index 5 dark magenta stdcol[18].setRgb( 128, 128, 0 ); // index 3 dark yellow #endif } #endif /*! \enum QColor::Spec The type of color specified, either RGB or HSV, e.g. in the \c{QColor::QColor( x, y, z, colorSpec)} constructor. \value Rgb \value Hsv */ /*! \fn QColor::QColor() Constructs an invalid color with the RGB value (0, 0, 0). An invalid color is a color that is not properly set up for the underlying window system. The alpha value of an invalid color is unspecified. \sa isValid() */ /*! \fn QColor::QColor( int r, int g, int b ) Constructs a color with the RGB value \a r, \a g, \a b, in the same way as setRgb(). The color is left invalid if any or the arguments are illegal. \sa setRgb() */ /*! Constructs a color with the RGB value \a rgb and a custom pixel value \a pixel. If \a pixel == 0xffffffff (the default), then the color uses the RGB value in a standard way. If \a pixel is something else, then the pixel value is set directly to \a pixel, skipping the normal allocation procedure. */ QColor::QColor( QRgb rgb, uint pixel ) { if ( pixel == 0xffffffff ) { setRgb( rgb ); } else { d.argb = rgb; setPixel( pixel ); } } void QColor::setPixel( uint pixel ) { switch ( colormodel ) { case d8: d.d8.direct = TRUE; d.d8.invalid = FALSE; d.d8.dirty = FALSE; d.d8.pix = pixel; break; case d32: d.d32.pix = pixel; break; } } /*! Constructs a color with the RGB or HSV value \a x, \a y, \a z. The arguments are an RGB value if \a colorSpec is QColor::Rgb. \a x (red), \a y (green), and \a z (blue). All of them must be in the range 0-255. The arguments are an HSV value if \a colorSpec is QColor::Hsv. \a x (hue) must be -1 for achromatic colors and 0-359 for chromatic colors; \a y (saturation) and \a z (value) must both be in the range 0-255. \sa setRgb(), setHsv() */ QColor::QColor( int x, int y, int z, Spec colorSpec ) { d.d32.argb = Invalid; d.d32.pix = Dirt; if ( colorSpec == Hsv ) setHsv( x, y, z ); else setRgb( x, y, z ); } /*! Constructs a named color in the same way as setNamedColor() using name \a name. The color is left invalid if \a name cannot be parsed. \sa setNamedColor() */ #if 0 QColor::QColor( const QString& name ) { setNamedColor( name ); } #endif /*! Constructs a named color in the same way as setNamedColor() using name \a name. The color is left invalid if \a name cannot be parsed. \sa setNamedColor() */ #if 0 QColor::QColor( const char *name ) { setNamedColor( QString(name) ); } #endif /*! Constructs a color that is a copy of \a c. */ QColor::QColor( const QColor &c ) { //if ( !globals_init ) //initGlobalColors(); d.argb = c.d.argb; d.d32.pix = c.d.d32.pix; } /*! Assigns a copy of the color \a c and returns a reference to this color. */ QColor &QColor::operator=( const QColor &c ) { //if ( !globals_init ) //initGlobalColors(); d.argb = c.d.argb; d.d32.pix = c.d.d32.pix; return *this; } /*! \fn bool QColor::isValid() const Returns FALSE if the color is invalid, i.e. it was constructed using the default constructor; otherwise returns TRUE. */ /*! \internal */ bool QColor::isDirty() const { if ( colormodel == d8 ) { return d.d8.dirty; } else { return d.d32.probablyDirty(); } } /*! Returns the name of the color in the format "#RRGGBB", i.e. a "#" character followed by three two-digit hexadecimal numbers. \sa setNamedColor() */ #if 0 QString QColor::name() const { #ifndef QT_NO_SPRINTF QString s; s.sprintf( "#%02x%02x%02x", red(), green(), blue() ); return s; #else char s[20]; sprintf( s, "#%02x%02x%02x", red(), green(), blue() ); return QString(s); #endif } static int hex2int( QChar hexchar ) { int v; if ( hexchar.isDigit() ) v = hexchar.digitValue(); else if ( hexchar >= 'A' && hexchar <= 'F' ) v = hexchar.cell() - 'A' + 10; else if ( hexchar >= 'a' && hexchar <= 'f' ) v = hexchar.cell() - 'a' + 10; else v = -1; return v; } #endif /*! Sets the RGB value to \a name, which may be in one of these formats: \list \i #RGB (each of R, G and B is a single hex digit) \i #RRGGBB \i #RRRGGGBBB \i #RRRRGGGGBBBB \i A name from the X color database (rgb.txt) (e.g. "steelblue" or "gainsboro"). These color names also work under Windows. \endlist The color is invalid if \a name cannot be parsed. */ #if 0 void QColor::setNamedColor( const QString &name ) { if ( name.isEmpty() ) { d.argb = 0; if ( colormodel == d8 ) { d.d8.invalid = TRUE; } else { d.d32.argb = Invalid; } } else if ( name[0] == '#' ) { const QChar *p = name.unicode()+1; int len = name.length()-1; int r, g, b; if ( len == 12 ) { r = (hex2int(p[0]) << 4) + hex2int(p[1]); g = (hex2int(p[4]) << 4) + hex2int(p[5]); b = (hex2int(p[8]) << 4) + hex2int(p[9]); } else if ( len == 9 ) { r = (hex2int(p[0]) << 4) + hex2int(p[1]); g = (hex2int(p[3]) << 4) + hex2int(p[4]); b = (hex2int(p[6]) << 4) + hex2int(p[7]); } else if ( len == 6 ) { r = (hex2int(p[0]) << 4) + hex2int(p[1]); g = (hex2int(p[2]) << 4) + hex2int(p[3]); b = (hex2int(p[4]) << 4) + hex2int(p[5]); } else if ( len == 3 ) { r = (hex2int(p[0]) << 4) + hex2int(p[0]); g = (hex2int(p[1]) << 4) + hex2int(p[1]); b = (hex2int(p[2]) << 4) + hex2int(p[2]); } else { r = g = b = -1; } if ( (uint)r > 255 || (uint)g > 255 || (uint)b > 255 ) { d.d32.argb = Invalid; d.d32.pix = Dirt; #if defined(QT_CHECK_RANGE) qWarning( "QColor::setNamedColor: could not parse color '%s'", name.local8Bit().data() ); #endif } else { setRgb( r, g, b ); } } else { setSystemNamedColor( name ); } } #endif #undef max #undef min /*! \fn void QColor::getHsv( int &h, int &s, int &v ) const \obsolete */ /*! \fn void QColor::getHsv( int *h, int *s, int *v ) const Returns the current RGB value as HSV. The contents of the \a h, \a s and \a v pointers are set to the HSV values. If any of the three pointers are null, the function does nothing. The hue (which \a h points to) is set to -1 if the color is achromatic. \warning Colors are stored internally as RGB values, so getHSv() may return slightly different values to those set by setHsv(). \sa setHsv(), rgb() */ /*! \obsolete Use getHsv() instead. */ void QColor::hsv( int *h, int *s, int *v) const { if ( !h || !s || !v ) return; int r = qRed(d.argb); int g = qGreen(d.argb); int b = qBlue(d.argb); uint max = r; // maximum RGB component int whatmax = 0; // r=>0, g=>1, b=>2 if ( (uint)g > max ) { max = g; whatmax = 1; } if ( (uint)b > max ) { max = b; whatmax = 2; } uint min = r; // find minimum value if ( (uint)g < min ) min = g; if ( (uint)b < min ) min = b; int delta = max-min; *v = max; // calc value *s = max ? (510*delta+max)/(2*max) : 0; if ( *s == 0 ) { *h = -1; // undefined hue } else { switch ( whatmax ) { case 0: // red is max component if ( g >= b ) *h = (120*(g-b)+delta)/(2*delta); else *h = (120*(g-b+delta)+delta)/(2*delta) + 300; break; case 1: // green is max component if ( b > r ) *h = 120 + (120*(b-r)+delta)/(2*delta); else *h = 60 + (120*(b-r+delta)+delta)/(2*delta); break; case 2: // blue is max component if ( r > g ) *h = 240 + (120*(r-g)+delta)/(2*delta); else *h = 180 + (120*(r-g+delta)+delta)/(2*delta); break; } } } /*! Sets a HSV color value. \a h is the hue, \a s is the saturation and \a v is the value of the HSV color. If \a s or \a v are not in the range 0-255, or \a h is < -1, the color is not changed. \warning Colors are stored internally as RGB values, so getHSv() may return slightly different values to those set by setHsv(). \sa hsv(), setRgb() */ void QColor::setHsv( int h, int s, int v ) { if ( h < -1 || (uint)s > 255 || (uint)v > 255 ) { #if defined(QT_CHECK_RANGE) qWarning( "QColor::setHsv: HSV parameters out of range" ); #endif return; } int r=v, g=v, b=v; if ( s == 0 || h == -1 ) { // achromatic case // Ignore } else { // chromatic case if ( (uint)h >= 360 ) h %= 360; uint f = h%60; h /= 60; uint p = (uint)(2*v*(255-s)+255)/510; uint q, t; if ( h&1 ) { q = (uint)(2*v*(15300-s*f)+15300)/30600; switch( h ) { case 1: r=(int)q; g=(int)v, b=(int)p; break; case 3: r=(int)p; g=(int)q, b=(int)v; break; case 5: r=(int)v; g=(int)p, b=(int)q; break; } } else { t = (uint)(2*v*(15300-(s*(60-f)))+15300)/30600; switch( h ) { case 0: r=(int)v; g=(int)t, b=(int)p; break; case 2: r=(int)p; g=(int)v, b=(int)t; break; case 4: r=(int)t; g=(int)p, b=(int)v; break; } } } setRgb( r, g, b ); } /*! \fn QRgb QColor::rgb() const Returns the RGB value. The return type \e QRgb is equivalent to \c unsigned \c int. For an invalid color, the alpha value of the returned color is unspecified. \sa setRgb(), hsv(), qRed(), qBlue(), qGreen(), isValid() */ /*! \fn void QColor::getRgb( int *r, int *g, int *b ) const Sets the contents pointed to by \a r, \a g and \a b to the red, green and blue components of the RGB value respectively. The value range for a component is 0..255. \sa rgb(), setRgb(), getHsv() */ /*! \obsolete Use getRgb() instead */ void QColor::rgb( int *r, int *g, int *b) const { *r = qRed(d.argb); *g = qGreen(d.argb); *b = qBlue(d.argb); } /*! Sets the RGB value to \a r, \a g, \a b. The arguments, \a r, \a g and \a b must all be in the range 0..255. If any of them are outside the legal range, the color is not changed. \sa rgb(), setHsv() */ void QColor::setRgb( int r, int g, int b) { /* if ( (uint)r > 255 || (uint)g > 255 || (uint)b > 255 ) { #if defined(QT_CHECK_RANGE) qWarning( "QColor::setRgb: RGB parameter(s) out of range" ); #endif return; }*/ d.argb = qRgba( r, g, b, alpha() ); if ( colormodel == d8 ) { d.d8.invalid = FALSE; d.d8.direct = FALSE; d.d8.dirty = TRUE; } else { d.d32.pix = Dirt; } } /*! \overload Sets the RGB value to \a rgb. The type \e QRgb is equivalent to \c unsigned \c int. \sa rgb(), setHsv() */ void QColor::setRgb( QRgb rgb ) { d.argb = rgb; if ( colormodel == d8 ) { d.d8.invalid = FALSE; d.d8.direct = FALSE; d.d8.dirty = TRUE; } else { d.d32.pix = Dirt; } } /*! \fn int QColor::red() const Returns the R (red) component of the RGB value. */ /*! \fn int QColor::green() const Returns the G (green) component of the RGB value. */ /*! \fn int QColor::blue() const Returns the B (blue) component of the RGB value. */ /*! Returns a lighter (or darker) color, but does not change this object. Returns a lighter color if \a factor is greater than 100. Setting \a factor to 150 returns a color that is 50% brighter. Returns a darker color if \a factor is less than 100. We recommend using dark() for this purpose. If \a factor is 0 or negative, the return value is unspecified. (This function converts the current RGB color to HSV, multiplies V by \a factor, and converts the result back to RGB.) \sa dark() */ QColor QColor::light( int factor ) const { if ( factor <= 0 ) // invalid lightness factor return *this; else if ( factor < 100 ) // makes color darker return dark( 10000/factor ); int h, s, v; hsv( &h, &s, &v ); v = (factor*v)/100; if ( v > 255 ) { // overflow s -= v-255; // adjust saturation if ( s < 0 ) s = 0; v = 255; } QColor c; c.setHsv( h, s, v ); return c; } /*! Returns a darker (or lighter) color, but does not change this object. Returns a darker color if \a factor is greater than 100. Setting \a factor to 300 returns a color that has one-third the brightness. Returns a lighter color if \a factor is less than 100. We recommend using lighter() for this purpose. If \a factor is 0 or negative, the return value is unspecified. (This function converts the current RGB color to HSV, divides V by \a factor and converts back to RGB.) \sa light() */ QColor QColor::dark( int factor ) const { if ( factor <= 0 ) // invalid darkness factor return *this; else if ( factor < 100 ) // makes color lighter return light( 10000/factor ); int h, s, v; hsv( &h, &s, &v ); v = (v*100)/factor; QColor c; c.setHsv( h, s, v ); return c; } /*! \fn bool QColor::operator==( const QColor &c ) const Returns TRUE if this color has the same RGB value as \a c; otherwise returns FALSE. */ /*! \fn bool QColor::operator!=( const QColor &c ) const Returns TRUE if this color has a different RGB value from \a c; otherwise returns FALSE. */ /*! Returns the pixel value. This value is used by the underlying window system to refer to a color. It can be thought of as an index into the display hardware's color table, but the value is an arbitrary 32-bit value. \sa alloc() */ /*! \fn QStringList QColor::colorNames() Returns a QStringList containing the color names Qt knows about. */ /***************************************************************************** QColor stream functions *****************************************************************************/ #ifndef QT_NO_DATASTREAM /*! \relates QColor Writes a color object, \a c to the stream, \a s. \sa \link datastreamformat.html Format of the QDataStream operators \endlink */ QDataStream &operator<<( QDataStream &s, const QColor &c ) { Q_UINT32 p = (Q_UINT32)c.rgb(); if ( s.version() == 1 ) // Swap red and blue p = ((p << 16) & 0xff0000) | ((p >> 16) & 0xff) | (p & 0xff00ff00); return s << p; } /*! \relates QColor Reads a color object, \a c, from the stream, \a s. \sa \link datastreamformat.html Format of the QDataStream operators \endlink */ QDataStream &operator>>( QDataStream &s, QColor &c ) { Q_UINT32 p; s >> p; if ( s.version() == 1 ) // Swap red and blue p = ((p << 16) & 0xff0000) | ((p >> 16) & 0xff) | (p & 0xff00ff00); c.setRgb( p ); return s; } #endif /***************************************************************************** QColor global functions (documentation only) *****************************************************************************/ /*! \fn int qRed( QRgb rgb ) \relates QColor Returns the red component of the RGB triplet \a rgb. \sa qRgb(), QColor::red() */ /*! \fn int qGreen( QRgb rgb ) \relates QColor Returns the green component of the RGB triplet \a rgb. \sa qRgb(), QColor::green() */ /*! \fn int qBlue( QRgb rgb ) \relates QColor Returns the blue component of the RGB triplet \a rgb. \sa qRgb(), QColor::blue() */ /*! \fn int qAlpha( QRgb rgba ) \relates QColor Returns the alpha component of the RGBA quadruplet \a rgba. */ /*! \fn QRgb qRgb( int r, int g, int b ) \relates QColor Returns the RGB triplet \a (r,g,b). The return type QRgb is equivalent to \c unsigned \c int. \sa qRgba(), qRed(), qGreen(), qBlue() */ /*! \fn QRgb qRgba( int r, int g, int b, int a ) \relates QColor Returns the RGBA quadruplet \a (r,g,b,a). The return type QRgba is equivalent to \c unsigned \c int. \sa qRgb(), qRed(), qGreen(), qBlue() */ /*! \fn int qGray( int r, int g, int b ) \relates QColor Returns a gray value 0..255 from the (\a r, \a g, \a b) triplet. The gray value is calculated using the formula (r*11 + g*16 + b*5)/32. */ /*! \overload int qGray( qRgb rgb ) \relates QColor Returns a gray value 0..255 from the given \a rgb colour. */