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/*
* linux/drivers/video/softcursor.c -- Generic software cursor for frame buffer devices
*
* Created 14 Nov 2002 by James Simmons
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
#include <linux/module.h>
#include <linux/string.h>
#include <linux/tty.h>
#include <linux/fb.h>
#include <linux/slab.h>
#include <asm/uaccess.h>
#include <asm/io.h>
int soft_cursor(struct fb_info *info, struct fb_cursor *cursor)
{
unsigned int scan_align = info->pixmap.scan_align - 1;
unsigned int buf_align = info->pixmap.buf_align - 1;
unsigned int i, size, dsize, s_pitch, d_pitch;
struct fb_image *image;
u8 *dst, *src;
if (info->state != FBINFO_STATE_RUNNING)
return 0;
s_pitch = (cursor->image.width + 7) >> 3;
dsize = s_pitch * cursor->image.height;
src = kmalloc(dsize + sizeof(struct fb_image), GFP_ATOMIC);
if (!src)
return -ENOMEM;
image = (struct fb_image *) (src + dsize);
*image = cursor->image;
d_pitch = (s_pitch + scan_align) & ~scan_align;
size = d_pitch * image->height + buf_align;
size &= ~buf_align;
dst = fb_get_buffer_offset(info, &info->pixmap, size);
if (cursor->enable) {
switch (cursor->rop) {
case ROP_XOR:
for (i = 0; i < dsize; i++)
src[i] = image->data[i] ^ cursor->mask[i];
break;
case ROP_COPY:
default:
for (i = 0; i < dsize; i++)
src[i] = image->data[i] & cursor->mask[i];
break;
}
} else
memcpy(src, image->data, dsize);
fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, image->height);
image->data = dst;
info->fbops->fb_imageblit(info, image);
kfree(src);
return 0;
}
EXPORT_SYMBOL(soft_cursor);
MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
MODULE_DESCRIPTION("Generic software cursor");
MODULE_LICENSE("GPL");
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