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->sprite.scan_align - 1;
  23         unsigned int buf_align = info->sprite.buf_align - 1;
  24         unsigned int i, size, dsize, s_pitch, d_pitch;
  25         u8 *dst, src[64];
  26
  27         if (cursor->set & FB_CUR_SETSIZE) {
  28                 info->cursor.image.height = cursor->image.height;
  29                 info->cursor.image.width = cursor->image.width;
  30         }
  31
  32         if (cursor->set & FB_CUR_SETPOS) {
  33                 info->cursor.image.dx = cursor->image.dx;
  34                 info->cursor.image.dy = cursor->image.dy;
  35         }
  36
  37         if (cursor->set & FB_CUR_SETHOT)
  38                 info->cursor.hot = cursor->hot;
  39
  40         if (cursor->set & FB_CUR_SETCMAP) {
  41                 if (cursor->image.depth == 1) {
  42                         info->cursor.image.bg_color = cursor->image.bg_color;
  43                         info->cursor.image.fg_color = cursor->image.fg_color;
  44                 } else {
  45                         if (cursor->image.cmap.len)
  46                                 fb_copy_cmap(&cursor->image.cmap, &info->cursor.image.cmap);
  47                 }
  48                 info->cursor.image.depth = cursor->image.depth;
  49         }
  50
  51         if (info->state != FBINFO_STATE_RUNNING)
  52                 return 0;
  53
  54         s_pitch = (info->cursor.image.width + 7) >> 3;
  55         dsize = s_pitch * info->cursor.image.height;
  56         d_pitch = (s_pitch + scan_align) & ~scan_align;
  57         size = d_pitch * info->cursor.image.height + buf_align;
  58         size &= ~buf_align;
  59         dst = fb_get_buffer_offset(info, &info->sprite, size);
  60
  61         if (info->cursor.enable) {
  62                 switch (info->cursor.rop) {
  63                 case ROP_XOR:
  64                         for (i = 0; i < dsize; i++)
  65                                 src[i] = cursor->image.data[i] ^ info->cursor.mask[i];
  66                         break;
  67                 case ROP_COPY:
  68                 default:
  69                         for (i = 0; i < dsize; i++)
  70                                 src[i] = cursor->image.data[i] & info->cursor.mask[i];
  71                         break;
  72                 }
  73         } else
  74                 memcpy(src, cursor->image.data, dsize);
  75
  76         if (info->sprite.outbuf)
  77                 fb_iomove_buf_aligned(info, &info->sprite, dst, d_pitch, src,
  78                                   s_pitch, info->cursor.image.height);
  79         else
  80                 fb_sysmove_buf_aligned(info, &info->sprite, dst, d_pitch, src,
  81                                    s_pitch, info->cursor.image.height);
  82         info->cursor.image.data = dst;
  83
  84         info->fbops->fb_imageblit(info, &info->cursor.image);
  85         return 0;
  86 }
  87
  88 EXPORT_SYMBOL(soft_cursor);
  89
  90 MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
  91 MODULE_DESCRIPTION("Generic software cursor");
  92 MODULE_LICENSE("GPL");