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