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.

---
 Makefile       |    3 +
 fbcon.h        |    4 ++
 fbcon_rotate.c |  105 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 fbcon_rotate.h |  102 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 214 insertions(+)

index 5222628..4532bdf 100644
@@ -31,6 +31,9 @@ obj-$(CONFIG_FRAMEBUFFER_CONSOLE) += fbc
 ifeq ($(CONFIG_FB_TILEBLITTING),y)
 obj-$(CONFIG_FRAMEBUFFER_CONSOLE)     += tileblit.o
 endif
+ifeq ($(CONFIG_FRAMEBUFFER_CONSOLE_ROTATION),y)
+obj-$(CONFIG_FRAMEBUFFER_CONSOLE)     += fbcon_rotate.o
+endif
 
 obj-$(CONFIG_FB_STI)              += sticore.o font.o
 

index 846a5a4..accfd7b 100644
@@ -215,7 +215,11 @@ static inline int get_attribute(struct f
         (void) (&_r == &_v); \
         (i == FB_ROTATE_UR || i == FB_ROTATE_UD) ? _r : _v; })
 
+#ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
+extern void fbcon_set_rotate(struct fbcon_ops *ops);
+#else
 #define fbcon_set_rotate(x) do {} while(0)
+#endif /* CONFIG_FRAMEBUFFER_CONSOLE_ROTATION */
 
 #endif /* _VIDEO_FBCON_H */
 

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