void gl_color(Fl_Color i)
{
#if USE_GL_OVERLAY
#ifndef _WIN32
if (fl_overlay) {glIndexi(int(fl_xpixel(i))); return;}
#else
if (fl_overlay && fl_overlay_depth)
{
i = fl_nearest_color(i); // convert to 8-bit color
if (fl_overlay_depth < 8)
{
// only black & white produce the expected colors. This could
// be improved by fixing the colormap set in Fl_Gl_Overlay.cxx
unsigned size = 1<<fl_overlay_depth;
if (!i) glIndexi(size-2);
else if (i >= size-2) glIndexi(size-1);
else glIndexi(i);
}
else
{
glIndexi(i ? i : FL_GRAY_RAMP);
}
return;
}
#endif
#endif
Fl_Color c = fl_get_color(i);
glColor3ub((uchar)(c>>24), (uchar)(c>>16), (uchar)(c>>8));
}
ulong fl_xpixel(Fl_Color i)
{
if (!beenhere) figure_out_visual();
#if USE_COLORMAP
#if USE_OVERLAY | USE_GL_OVERLAY
if (fl_redmask && !fl_overlay)
#else
if (fl_redmask)
#endif
{
#endif
// return color for a TrueColor visual:
if (!(i & 0xFFFFFF00)) i = (Fl_Color)fl_cmap[i];
return
((((i>>24)& fl_redmask) << fl_redshift)+
(((i>>16)& fl_greenmask)<< fl_greenshift)+
(((i>>8) & fl_bluemask) << fl_blueshift)
) >> fl_extrashift;
#if USE_COLORMAP
}
// rest of this is for a colormapped visual (it will work for a TrueColor
// visual but wastes time):
// translate rgb colors into color index:
int index = fl_nearest_color(i);
// see if we have already allocated it:
#if USE_OVERLAY | USE_GL_OVERLAY
Fl_XColor &xmap = fl_overlay ? fl_overlay_xmap[index] : fl_xmap[index];
#else
Fl_XColor &xmap = fl_xmap[index];
#endif
if (!xmap.mapped)
{
// figure out the rgb to ask for. Use the specified one unless this
// is an indexed color, in which case we use the colormap entry:
if (!(i & 0xFFFFFF00)) i = (Fl_Color)fl_cmap[i];
uchar r = i>>24;
uchar g = i>>16;
uchar b = i>> 8;
fl_allocate_xpixel(xmap, r, g, b);
}
return xmap.pixel;
}
