drivers/video/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 int soft_cursor(struct fb_info *info, struct fb_cursor *cursor)
  21 {
  22         unsigned int scan_align = info->pixmap.scan_align - 1;
  23         unsigned int buf_align = info->pixmap.buf_align - 1;
  24         unsigned int i, size, dsize, s_pitch, d_pitch;
  25         struct fb_image *image;
  26         u8 *dst, *src;
  27
  28         if (info->state != FBINFO_STATE_RUNNING)
  29                 return 0;
  30
  31         s_pitch = (cursor->image.width + 7) >> 3;
  32         dsize = s_pitch * cursor->image.height;
  33
  34         src = kmalloc(dsize + sizeof(struct fb_image), GFP_ATOMIC);
  35         if (!src)
  36                 return -ENOMEM;
  37
  38         image = (struct fb_image *) (src + dsize);
  39         *image = cursor->image;
  40         d_pitch = (s_pitch + scan_align) & ~scan_align;
  41
  42         size = d_pitch * image->height + buf_align;
  43         size &= ~buf_align;
  44         dst = fb_get_buffer_offset(info, &info->pixmap, size);
  45
  46         if (cursor->enable) {
  47                 switch (cursor->rop) {
  48                 case ROP_XOR:
  49                         for (i = 0; i < dsize; i++)
  50                                 src[i] = image->data[i] ^ cursor->mask[i];
  51                         break;
  52                 case ROP_COPY:
  53                 default:
  54                         for (i = 0; i < dsize; i++)
  55                                 src[i] = image->data[i] & cursor->mask[i];
  56                         break;
  57                 }
  58         } else
  59                 memcpy(src, image->data, dsize);
  60
  61         fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, image->height);
  62         image->data = dst;
  63         info->fbops->fb_imageblit(info, image);
  64         kfree(src);
  65         return 0;
  66 }
  67
  68 EXPORT_SYMBOL(soft_cursor);
  69
  70 MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
  71 MODULE_DESCRIPTION("Generic software cursor");
  72 MODULE_LICENSE("GPL");