tallocimagemix.c - plan9port - [fork] Plan 9 from user space
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       ---
       tallocimagemix.c (924B)
       ---
            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 }