[PATCH] fbcon: Console Rotation - Add support to rotate font bitmap
Add support to rotate the font bitmap. To save on processing time, the entire
fontdata will be rotated on a console switch, then stored in a buffer private
to fbcon. To further save on processing, the fontdata will only be rotated if
the font has changed or if the angle of rotation has changed. Only a single
copy of the rotated fontdata will be kept.
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/video/console/fbcon_rotate.c b/drivers/video/console/fbcon_rotate.c
new file mode 100644
index 0000000..6a96931
--- /dev/null
+++ b/drivers/video/console/fbcon_rotate.c
@@ -0,0 +1,105 @@
+/*
+ * linux/drivers/video/console/fbcon_rotate.c -- Software Rotation
+ *
+ * Copyright (C) 2005 Antonino Daplas <adaplas @pol.net>
+ *
+ * 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/config.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/fb.h>
+#include <linux/vt_kern.h>
+#include <linux/console.h>
+#include <asm/types.h>
+#include "fbcon.h"
+#include "fbcon_rotate.h"
+
+static int fbcon_rotate_font(struct fb_info *info, struct vc_data *vc,
+ struct display *p)
+{
+ struct fbcon_ops *ops = info->fbcon_par;
+ int len, err = 0;
+ int s_cellsize, d_cellsize, i;
+ const u8 *src;
+ u8 *dst;
+
+ if (vc->vc_font.data == ops->fontdata &&
+ p->con_rotate == ops->cur_rotate)
+ goto finished;
+
+ src = ops->fontdata = vc->vc_font.data;
+ ops->cur_rotate = p->con_rotate;
+ len = (!p->userfont) ? 256 : FNTCHARCNT(src);
+ s_cellsize = ((vc->vc_font.width + 7)/8) *
+ vc->vc_font.height;
+ d_cellsize = s_cellsize;
+
+ if (ops->rotate == FB_ROTATE_CW ||
+ ops->rotate == FB_ROTATE_CCW)
+ d_cellsize = ((vc->vc_font.height + 7)/8) *
+ vc->vc_font.width;
+
+ if (info->fbops->fb_sync)
+ info->fbops->fb_sync(info);
+
+ if (ops->fd_size < d_cellsize * len) {
+ dst = kmalloc(d_cellsize * len, GFP_KERNEL);
+
+ if (dst == NULL) {
+ err = -ENOMEM;
+ goto finished;
+ }
+
+ ops->fd_size = d_cellsize * len;
+ kfree(ops->fontbuffer);
+ ops->fontbuffer = dst;
+ }
+
+ dst = ops->fontbuffer;
+ memset(dst, 0, ops->fd_size);
+
+ switch (ops->rotate) {
+ case FB_ROTATE_UD:
+ for (i = len; i--; ) {
+ rotate_ud(src, dst, vc->vc_font.width,
+ vc->vc_font.height);
+
+ src += s_cellsize;
+ dst += d_cellsize;
+ }
+ break;
+ case FB_ROTATE_CW:
+ for (i = len; i--; ) {
+ rotate_cw(src, dst, vc->vc_font.width,
+ vc->vc_font.height);
+ src += s_cellsize;
+ dst += d_cellsize;
+ }
+ break;
+ case FB_ROTATE_CCW:
+ for (i = len; i--; ) {
+ rotate_ccw(src, dst, vc->vc_font.width,
+ vc->vc_font.height);
+ src += s_cellsize;
+ dst += d_cellsize;
+ }
+ break;
+ }
+
+finished:
+ return err;
+}
+
+void fbcon_set_rotate(struct fbcon_ops *ops)
+{
+ ops->rotate_font = fbcon_rotate_font;
+}
+EXPORT_SYMBOL(fbcon_set_rotate);
+
+MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
+MODULE_DESCRIPTION("Console Rotation Support");
+MODULE_LICENSE("GPL");