plan9front/sys/src/libdraw/allocimagemix.c

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#include <u.h>
#include <libc.h>
#include <draw.h>
Image*
allocimagemix(Display *d, ulong color1, ulong color3)
{
Image *t, *b;
static Image *qmask;
if(qmask == nil)
qmask = allocimage(d, Rect(0,0,1,1), GREY8, 1, 0x3F3F3FFF);
if(d->screenimage->depth <= 8){ /* create a 2×2 texture */
t = allocimage(d, Rect(0,0,1,1), d->screenimage->chan, 0, color1);
if(t == nil)
return nil;
b = allocimage(d, Rect(0,0,2,2), d->screenimage->chan, 1, color3);
if(b == nil){
freeimage(t);
return nil;
}
draw(b, Rect(0,0,1,1), t, nil, ZP);
freeimage(t);
return b;
}else{ /* use a solid color, blended using alpha */
t = allocimage(d, Rect(0,0,1,1), d->screenimage->chan, 1, color1);
if(t == nil)
return nil;
b = allocimage(d, Rect(0,0,1,1), d->screenimage->chan, 1, color3);
if(b == nil){
freeimage(t);
return nil;
}
draw(b, b->r, t, qmask, ZP);
freeimage(t);
return b;
}
}