[PATCH] fbcon/fbdev: Move softcursor out of fbdev to fbcon

According to Jon Smirl, filling in the field fb_cursor with soft_cursor for
drivers that do not support hardware cursors is redundant.  The soft_cursor
function is usable by all drivers because it is just a wrapper around
fb_imageblit.  And because soft_cursor is an fbcon-specific hook, the file is
moved to the console directory.

Thus, drivers that do not support hardware cursors can leave the fb_cursor
field blank.  For drivers that do, they can fill up this field with their own
version.

The end result is a smaller code size.  And if the framebuffer console is not
loaded, module/kernel size is also reduced because the soft_cursor module will
also not be loaded.

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 72 insertions, 0 deletions

diff --git a/drivers/video/console/softcursor.c b/drivers/video/console/softcursor.c
new file mode 100644
index 00000000000..8529bf08db2
--- /dev/null
+++ b/drivers/video/console/softcursor.c
@@ -0,0 +1,72 @@
+/*
+ * 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");