1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 
5 Image*
6 allocimagemix(Display *d, u32int color1, u32int color3)
7 {
8 	Image *t, *b;
9 	static Image *qmask;
10 
11 	if(qmask == nil)
12 		qmask = allocimage(d, Rect(0,0,1,1), GREY8, 1, 0x3F3F3FFF);
13 
14 	if(d->screenimage->depth <= 8){	/* create a 2×2 texture */
15 		t = allocimage(d, Rect(0,0,1,1), d->screenimage->chan, 0, color1);
16 		if(t == nil)
17 			return nil;
18 
19 		b = allocimage(d, Rect(0,0,2,2), d->screenimage->chan, 1, color3);
20 		if(b == nil){
21 			freeimage(t);
22 			return nil;
23 		}
24 
25 		draw(b, Rect(0,0,1,1), t, nil, ZP);
26 		freeimage(t);
27 		return b;
28 	}else{	/* use a solid color, blended using alpha */
29 		t = allocimage(d, Rect(0,0,1,1), d->screenimage->chan, 1, color1);
30 		if(t == nil)
31 			return nil;
32 
33 		b = allocimage(d, Rect(0,0,1,1), d->screenimage->chan, 1, color3);
34 		if(b == nil){
35 			freeimage(t);
36 			return nil;
37 		}
38 
39 		draw(b, b->r, t, qmask, ZP);
40 		freeimage(t);
41 		return b;
42 	}
43 }