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(objp: ops->cursor_src);
39 ops->cursor_size = dsize + sizeof(struct fb_image);
40
41 ops->cursor_src = kmalloc(size: 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, buf: &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, height: image->height);
73 image->data = dst;
74 info->fbops->fb_imageblit(info, image);
75 return 0;
76}
77

source code of linux/drivers/video/fbdev/core/softcursor.c