Linux Kernel  3.7.1
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softcursor.c
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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  if (ops->cursor_src != NULL)
39  kfree(ops->cursor_src);
40  ops->cursor_size = dsize + sizeof(struct fb_image);
41 
43  if (!ops->cursor_src) {
44  ops->cursor_size = 0;
45  return -ENOMEM;
46  }
47  }
48 
49  src = ops->cursor_src + sizeof(struct fb_image);
50  image = (struct fb_image *)ops->cursor_src;
51  *image = cursor->image;
52  d_pitch = (s_pitch + scan_align) & ~scan_align;
53 
54  size = d_pitch * image->height + buf_align;
55  size &= ~buf_align;
56  dst = fb_get_buffer_offset(info, &info->pixmap, size);
57 
58  if (cursor->enable) {
59  switch (cursor->rop) {
60  case ROP_XOR:
61  for (i = 0; i < dsize; i++)
62  src[i] = image->data[i] ^ cursor->mask[i];
63  break;
64  case ROP_COPY:
65  default:
66  for (i = 0; i < dsize; i++)
67  src[i] = image->data[i] & cursor->mask[i];
68  break;
69  }
70  } else
71  memcpy(src, image->data, dsize);
72 
73  fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, image->height);
74  image->data = dst;
75  info->fbops->fb_imageblit(info, image);
76  return 0;
77 }
78 
80 
81 MODULE_AUTHOR("James Simmons <[email protected]>");
82 MODULE_DESCRIPTION("Generic software cursor");
83 MODULE_LICENSE("GPL");