static void blend_color_lighten(char *cp, char *cp1, char *cp2, int fac)
{
/* See if are lighter, if so mix, else dont do anything.
if the paint col is darker then the original, then ignore */
if (cp1[0]+cp1[1]+cp1[2] > cp2[0]+cp2[1]+cp2[2]) {
cp[0]= cp1[0];
cp[1]= cp1[1];
cp[2]= cp1[2];
}
else
blend_color_mix(cp, cp1, cp2, fac);
}
unsigned int IMB_blend_color(unsigned int src1, unsigned int src2, int fac, IMB_BlendMode mode)
{
unsigned int dst;
int temp;
char *cp, *cp1, *cp2;
if (fac==0)
return src1;
cp = (char*)&dst;
cp1 = (char*)&src1;
cp2 = (char*)&src2;
switch (mode) {
case IMB_BLEND_MIX:
blend_color_mix(cp, cp1, cp2, fac);
break;
case IMB_BLEND_ADD:
blend_color_add(cp, cp1, cp2, fac);
break;
case IMB_BLEND_SUB:
blend_color_sub(cp, cp1, cp2, fac);
break;
case IMB_BLEND_MUL:
blend_color_mul(cp, cp1, cp2, fac);
break;
case IMB_BLEND_LIGHTEN:
blend_color_lighten(cp, cp1, cp2, fac);
break;
case IMB_BLEND_DARKEN:
blend_color_darken(cp, cp1, cp2, fac);
break;
default:
cp[0]= cp1[0];
cp[1]= cp1[1];
cp[2]= cp1[2];
}
if (mode == IMB_BLEND_ERASE_ALPHA) {
temp= (cp1[3] - fac*cp2[3]/255);
cp[3]= (temp < 0)? 0: temp;
}
else { /* this does ADD_ALPHA also */
temp= (cp1[3] + fac*cp2[3]/255);
cp[3]= (temp > 255)? 255: temp;
}
return dst;
}
