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#include <Xw_Extension.h>
/* ifdef then trace on */
#ifdef TRACE
#define TRACE_GET_COLOR
#endif
/*
STATUS Xw_get_color(acolormap,index,r,g,b,pixel):
XW_EXT_COLORMAP *acolormap Colormap extension structure
int index ; Color index 0 >= x < MAXCOLOR
float *r,*g,*b ; Return Red,Green,Blue color value 0. >= x <= 1.
unsigned long *pixel ;
Get R,G,B Color values from index .
Returns ERROR if BadColor Index or color is not defined
Returns SUCCESS if Successful
*/
#ifdef XW_PROTOTYPE
XW_STATUS Xw_get_color (void* acolormap,int index,float* r,float* g,float* b,unsigned long *pixel)
#else
XW_STATUS Xw_get_color (acolormap,index,r,g,b,pixel)
void *acolormap;
int index ;
float *r,*g,*b ;
unsigned long *pixel ;
#endif /*XW_PROTOTYPE*/
{
XW_EXT_COLORMAP *pcolormap = (XW_EXT_COLORMAP*)acolormap;
XColor color ;
*pixel = 0;
*r = *g = *b = 0.;
if ( !Xw_isdefine_colorindex(pcolormap,index) ) {
/*ERROR*Bad color Index*/
Xw_set_error(1,"Xw_get_color",&index) ;
return (XW_ERROR) ;
}
switch ( _CCLASS ) {
case PseudoColor :
case StaticColor :
color.pixel = pcolormap->pixels[index] ;
XQueryColor(_CDISPLAY,_CINFO.colormap,&color) ;
*r = (float)color.red/0xFFFF ;
*g = (float)color.green/0xFFFF ;
*b = (float)color.blue/0xFFFF ;
break ;
case TrueColor :
{ unsigned long mask = _CVISUAL->map_entries-1 ;
unsigned long red,green,blue ;
unsigned long rmask = _CVISUAL->red_mask ;
unsigned long gmask = _CVISUAL->green_mask ;
unsigned long bmask = _CVISUAL->blue_mask ;
color.pixel = pcolormap->pixels[index] ;
red = color.pixel & rmask ;
while ( !(rmask & 0x01) ) { rmask >>= 1; red >>= 1; }
green = color.pixel & gmask ;
while ( !(gmask & 0x01) ) { gmask >>= 1; green >>= 1; }
blue = color.pixel & bmask ;
while ( !(bmask & 0x01) ) { bmask >>= 1; blue >>= 1; }
*r = (float)red/mask ;
*g = (float)green/mask ;
*b = (float)blue/mask ;
}
break ;
default :
/*Unmatchable Visual class*/
Xw_set_error(67,"Xw_get_color",&_CCLASS) ;
return (XW_ERROR) ;
}
*pixel = color.pixel ;
#ifdef TRACE_GET_COLOR
if( Xw_get_trace() > 1 ) {
printf(" Xw_get_color(%lx,%d,%f,%f,%f,%lx)\n",(long ) pcolormap,index,*r,*g,*b,*pixel) ;
}
#endif
return (XW_SUCCESS);
}
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