On 27.05.2010, at 11:05, MacArthur, Ian (SELEX GALILEO, UK) wrote: > The fltk code seems to test for this by masking the colour value with > 0xffffff00 and if that is non-zero, it treats it as RGB. > > If that is zero, it masks with 0x000000FF and then looks up the related > RGB values by doing a lookup into fl_cmap[] array. > > (pseudo code...) > > int i = c& 0x000000ff; > unsigned rgb = fl_cmap[i]; > r = rgb>> 24; > g = rgb>> 16; > b = rgb>> 8; > > (e.g. see fl_color_win32.cxx etc near line 111 of fltk-1.3) > > The problem with this seems to be that the fl_cmap[] array is static, > and I don't see how we get access to those values easily... > > Anybody know how that's done?
Not directly, but this trick should do it: unsigned rgb = (unsigned)fl_color_average((Fl_Color)i, FL_WHITE, 1.0); r = rgb>> 24 & 255; g = rgb>> 16 & 255; b = rgb>> 8 & 255; i can be any color (index or RGB value). FL_WHITE can be replaced with any color. Disclaimer: untested code! Albrecht _______________________________________________ fltk mailing list [email protected] http://lists.easysw.com/mailman/listinfo/fltk
