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libdraw: add Cursor2, a 32x32 high-res cursor Also add setcursor2, esetcursor2, and draw protocol encoding. Calls to the old setcursor, esetcursor create a 32x32 by pixel doubling when needed.
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1 #include <u.h>

2 #include <libc.h>

3 #include <draw.h>

4 #include <cursor.h>

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 };

13 void

14 scalecursor(Cursor2 *c2, Cursor *c)

15 {

16 	int y;

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 }