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
22int 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
78EXPORT_SYMBOL(soft_cursor);
79
80MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
81MODULE_DESCRIPTION("Generic software cursor");
82MODULE_LICENSE("GPL");
83