ref: d9d2925fa024c2eceeea18c9b3afda30af96301e
dir: /sys/src/libdraw/allocimagemix.c/
#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; } }