drivers/video/console/softcursor.c

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