/* * 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");