1 /*
2  * linux/drivers/video/console/softcursor.c
3  *
4  * Generic software cursor for frame buffer devices
5  *
6  *  Created 14 Nov 2002 by James Simmons
7  *
8  * This file is subject to the terms and conditions of the GNU General
9  * Public License.  See the file COPYING in the main directory of this
10  * archive for more details.
11  */
12 
13 #include <linux/module.h>
14 #include <linux/string.h>
15 #include <linux/fb.h>
16 #include <linux/slab.h>
17 
18 #include <asm/io.h>
19 
20 #include "fbcon.h"
21 
22 int soft_cursor(struct fb_info *info, struct fb_cursor *cursor)
23 {
24 	struct fbcon_ops *ops = info->fbcon_par;
25 	unsigned int scan_align = info->pixmap.scan_align - 1;
26 	unsigned int buf_align = info->pixmap.buf_align - 1;
27 	unsigned int i, size, dsize, s_pitch, d_pitch;
28 	struct fb_image *image;
29 	u8 *src, *dst;
30 
31 	if (info->state != FBINFO_STATE_RUNNING)
32 		return 0;
33 
34 	s_pitch = (cursor->image.width + 7) >> 3;
35 	dsize = s_pitch * cursor->image.height;
36 
37 	if (dsize + sizeof(struct fb_image) != ops->cursor_size) {
38 		kfree(ops->cursor_src);
39 		ops->cursor_size = dsize + sizeof(struct fb_image);
40 
41 		ops->cursor_src = kmalloc(ops->cursor_size, GFP_ATOMIC);
42 		if (!ops->cursor_src) {
43 			ops->cursor_size = 0;
44 			return -ENOMEM;
45 		}
46 	}
47 
48 	src = ops->cursor_src + sizeof(struct fb_image);
49 	image = (struct fb_image *)ops->cursor_src;
50 	*image = cursor->image;
51 	d_pitch = (s_pitch + scan_align) & ~scan_align;
52 
53 	size = d_pitch * image->height + buf_align;
54 	size &= ~buf_align;
55 	dst = fb_get_buffer_offset(info, &info->pixmap, size);
56 
57 	if (cursor->enable) {
58 		switch (cursor->rop) {
59 		case ROP_XOR:
60 			for (i = 0; i < dsize; i++)
61 				src[i] = image->data[i] ^ cursor->mask[i];
62 			break;
63 		case ROP_COPY:
64 		default:
65 			for (i = 0; i < dsize; i++)
66 				src[i] = image->data[i] & cursor->mask[i];
67 			break;
68 		}
69 	} else
70 		memcpy(src, image->data, dsize);
71 
72 	fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, image->height);
73 	image->data = dst;
74 	info->fbops->fb_imageblit(info, image);
75 	return 0;
76 }
77