tcursor.c - plan9port - [fork] Plan 9 from user space
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       ---
       tcursor.c (908B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include <draw.h>
            4 #include <cursor.h>
            5 
            6 static uint8 expand[16] = {
            7         0x00, 0x03, 0x0c, 0x0f,
            8         0x30, 0x33, 0x3c, 0x3f,
            9         0xc0, 0xc3, 0xcc, 0xcf,
           10         0xf0, 0xf3, 0xfc, 0xff,
           11 };
           12 
           13 void
           14 scalecursor(Cursor2 *c2, Cursor *c)
           15 {
           16         int y;
           17 
           18         c2->offset.x = 2*c->offset.x;
           19         c2->offset.y = 2*c->offset.y;
           20         memset(c2->clr, 0, sizeof c2->clr);
           21         memset(c2->set, 0, sizeof c2->set);
           22         for(y = 0; y < 16; y++) {
           23                 c2->clr[8*y] = c2->clr[8*y+4] = expand[c->clr[2*y]>>4];
           24                 c2->set[8*y] = c2->set[8*y+4] = expand[c->set[2*y]>>4];
           25                 c2->clr[8*y+1] = c2->clr[8*y+5] = expand[c->clr[2*y]&15];
           26                 c2->set[8*y+1] = c2->set[8*y+5] = expand[c->set[2*y]&15];
           27                 c2->clr[8*y+2] = c2->clr[8*y+6] = expand[c->clr[2*y+1]>>4];
           28                 c2->set[8*y+2] = c2->set[8*y+6] = expand[c->set[2*y+1]>>4];
           29                 c2->clr[8*y+3] = c2->clr[8*y+7] = expand[c->clr[2*y+1]&15];
           30                 c2->set[8*y+3] = c2->set[8*y+7] = expand[c->set[2*y+1]&15];
           31         }
           32 }