tdraw.c - plan9port - [fork] Plan 9 from user space
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       ---
       tdraw.c (1319B)
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            1 #include <u.h>
            2 #include <libc.h>
            3 #include <draw.h>
            4 
            5 void
            6 _setdrawop(Display *d, Drawop op)
            7 {
            8         uchar *a;
            9 
           10         if(op != SoverD){
           11                 a = bufimage(d, 1+1);
           12                 if(a == 0)
           13                         return;
           14                 a[0] = 'O';
           15                 a[1] = op;
           16         }
           17 }
           18 
           19 static void
           20 draw1(Image *dst, Rectangle *r, Image *src, Point *p0, Image *mask, Point *p1, Drawop op)
           21 {
           22         uchar *a;
           23 
           24         _setdrawop(dst->display, op);
           25 
           26         a = bufimage(dst->display, 1+4+4+4+4*4+2*4+2*4);
           27         if(a == 0)
           28                 return;
           29         if(src == nil)
           30                 src = dst->display->black;
           31         if(mask == nil)
           32                 mask = dst->display->opaque;
           33         a[0] = 'd';
           34         BPLONG(a+1, dst->id);
           35         BPLONG(a+5, src->id);
           36         BPLONG(a+9, mask->id);
           37         BPLONG(a+13, r->min.x);
           38         BPLONG(a+17, r->min.y);
           39         BPLONG(a+21, r->max.x);
           40         BPLONG(a+25, r->max.y);
           41         BPLONG(a+29, p0->x);
           42         BPLONG(a+33, p0->y);
           43         BPLONG(a+37, p1->x);
           44         BPLONG(a+41, p1->y);
           45 }
           46 
           47 void
           48 draw(Image *dst, Rectangle r, Image *src, Image *mask, Point p1)
           49 {
           50         draw1(dst, &r, src, &p1, mask, &p1, SoverD);
           51 }
           52 
           53 void
           54 drawop(Image *dst, Rectangle r, Image *src, Image *mask, Point p1, Drawop op)
           55 {
           56         draw1(dst, &r, src, &p1, mask, &p1, op);
           57 }
           58 
           59 void
           60 gendraw(Image *dst, Rectangle r, Image *src, Point p0, Image *mask, Point p1)
           61 {
           62         draw1(dst, &r, src, &p0, mask, &p1, SoverD);
           63 }
           64 
           65 void
           66 gendrawop(Image *dst, Rectangle r, Image *src, Point p0, Image *mask, Point p1, Drawop op)
           67 {
           68         draw1(dst, &r, src, &p0, mask, &p1, op);
           69 }