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/fb.h>
  14 #include <linux/slab.h>
  15
  16 #include <asm/uaccess.h>
  17 #include <asm/io.h>
  18
  19 #include "fbcon.h"
  20
  21 int soft_cursor(struct fb_info *info, struct fb_cursor *cursor)
  22 {
  23         struct fbcon_ops *ops = info->fbcon_par;
  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;
  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         if (dsize + sizeof(struct fb_image) != ops->cursor_size) {
  37                 if (ops->cursor_src != NULL)
  38                         kfree(ops->cursor_src);
  39                 ops->cursor_size = dsize + sizeof(struct fb_image);
  40
  41                 ops->cursor_src = kmalloc(ops->cursor_size, GFP_ATOMIC);
  42                 if (!ops->cursor_src) {
  43                         ops->cursor_size = 0;
  44                         return -ENOMEM;
  45                 }
  46         }
  47
  48         image = (struct fb_image *) (ops->cursor_src + dsize);
  49         *image = cursor->image;
  50         d_pitch = (s_pitch + scan_align) & ~scan_align;
  51
  52         size = d_pitch * image->height + buf_align;
  53         size &= ~buf_align;
  54         dst = fb_get_buffer_offset(info, &info->pixmap, size);
  55
  56         if (cursor->enable) {
  57                 switch (cursor->rop) {
  58                 case ROP_XOR:
  59                         for (i = 0; i < dsize; i++)
  60                                 ops->cursor_src[i] = image->data[i] ^
  61                                         cursor->mask[i];
  62                         break;
  63                 case ROP_COPY:
  64                 default:
  65                         for (i = 0; i < dsize; i++)
  66                                 ops->cursor_src[i] = image->data[i] &
  67                                         cursor->mask[i];
  68                         break;
  69                 }
  70         } else
  71                 memcpy(ops->cursor_src, image->data, dsize);
  72
  73         fb_pad_aligned_buffer(dst, d_pitch, ops->cursor_src, s_pitch,
  74                               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");