drivers/video/console/softcursor.c

   1 /*
   2  * linux/drivers/video/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/uaccess.h>
  19 #include <asm/io.h>
  20
  21 #include "fbcon.h"
  22
  23 int soft_cursor(struct fb_info *info, struct fb_cursor *cursor)
  24 {
  25         struct fbcon_ops *ops = info->fbcon_par;
  26         unsigned int scan_align = info->pixmap.scan_align - 1;
  27         unsigned int buf_align = info->pixmap.buf_align - 1;
  28         unsigned int i, size, dsize, s_pitch, d_pitch;
  29         struct fb_image *image;
  30         u8 *src, *dst;
  31
  32         if (info->state != FBINFO_STATE_RUNNING)
  33                 return 0;
  34
  35         s_pitch = (cursor->image.width + 7) >> 3;
  36         dsize = s_pitch * cursor->image.height;
  37
  38         if (dsize + sizeof(struct fb_image) != ops->cursor_size) {
  39                 if (ops->cursor_src != NULL)
  40                         kfree(ops->cursor_src);
  41                 ops->cursor_size = dsize + sizeof(struct fb_image);
  42
  43                 ops->cursor_src = kmalloc(ops->cursor_size, GFP_ATOMIC);
  44                 if (!ops->cursor_src) {
  45                         ops->cursor_size = 0;
  46                         return -ENOMEM;
  47                 }
  48         }
  49
  50         src = ops->cursor_src + sizeof(struct fb_image);
  51         image = (struct fb_image *)ops->cursor_src;
  52         *image = cursor->image;
  53         d_pitch = (s_pitch + scan_align) & ~scan_align;
  54
  55         size = d_pitch * image->height + buf_align;
  56         size &= ~buf_align;
  57         dst = fb_get_buffer_offset(info, &info->pixmap, size);
  58
  59         if (cursor->enable) {
  60                 switch (cursor->rop) {
  61                 case ROP_XOR:
  62                         for (i = 0; i < dsize; i++)
  63                                 src[i] = image->data[i] ^ cursor->mask[i];
  64                         break;
  65                 case ROP_COPY:
  66                 default:
  67                         for (i = 0; i < dsize; i++)
  68                                 src[i] = image->data[i] & cursor->mask[i];
  69                         break;
  70                 }
  71         } else
  72                 memcpy(src, image->data, dsize);
  73
  74         fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, image->height);
  75         image->data = dst;
  76         info->fbops->fb_imageblit(info, image);
  77         return 0;
  78 }
  79
  80 EXPORT_SYMBOL(soft_cursor);
  81
  82 MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
  83 MODULE_DESCRIPTION("Generic software cursor");
  84 MODULE_LICENSE("GPL");