/**
* Compute a RGB value with a specific format
* \param fr, fg, fb Foreground RGB values [0-255].
* \param br, bg, bb Background RGB values [0-255].
* \param a Alpha value [0-255].
* \param def_ordinal RGB format definition.
* \return RGB nibble as ordinal value.
*/
adv_pixel pixel_merge_from_def(unsigned fr, unsigned fg, unsigned fb, unsigned br, unsigned bg, unsigned bb, unsigned char a, adv_color_def def_ordinal)
{
return pixel_make_from_def(
(fr*a + (255-a)*br) / 255,
(fg*a + (255-a)*bg) / 255,
(fb*a + (255-a)*bb) / 255,
def_ordinal
);
}
static void ui_color_rgb_set(struct ui_color* color, const adv_color_rgb* c, adv_color_def color_def, adv_color_def buffer_def, unsigned translucency, adv_pixel* background)
{
color->c = *c;
color->p = pixel_make_from_def(c->red, c->green, c->blue, color_def);
color->f = alpha_make_from_def(c->red, c->green, c->blue, 255, buffer_def);
if (background)
color->b = *background;
else
color->b = alpha_make_from_def(c->red, c->green, c->blue, translucency, buffer_def);
}
/**
* Compute a RGBA value with a specific format
* \param r, g, b, a RGBA values [0-255].
* \param def_ordinal RGBA format definition.
* \return RGBA nibble as ordinal value.
*/
adv_pixel alpha_make_from_def(unsigned r, unsigned g, unsigned b, unsigned a, adv_color_def def_ordinal)
{
int alpha_shift;
adv_pixel alpha_mask;
adv_pixel p;
alpha_shiftmask_get(&alpha_shift, &alpha_mask, def_ordinal);
return pixel_make_from_def(r, g, b, def_ordinal)
| rgb_nibble_insert(a, alpha_shift, alpha_mask);
}