Greyscale library: * Introduced some extra macros dealing with block size, allowing to write some parts with less #ifdefing. * Optimised grey_update_rect() for horizontally packed LCDs, and unbuffered scrolling.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16050 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 6 insertions, 3 deletions

diff --git a/apps/plugins/lib/grey.h b/apps/plugins/lib/grey.h
index 9a3bd7d3f8..5bef88a89a 100644
--- a/apps/plugins/lib/grey.h
+++ b/apps/plugins/lib/grey.h
@@ -121,15 +121,18 @@ void grey_ub_scroll_down(int count);
 #endif
 
 #if LCD_PIXELFORMAT == HORIZONTAL_PACKING
-#define _GREY_X_ADVANCE 1
+#define _GREY_BSHIFT 0
 #else
 #if LCD_DEPTH == 1
-#define _GREY_X_ADVANCE 8
+#define _GREY_BSHIFT 3
 #elif LCD_DEPTH == 2
-#define _GREY_X_ADVANCE 4
+#define _GREY_BSHIFT 2
 #endif
 #endif /* LCD_PIXELFORMAT */
 
+#define _GREY_BSIZE (1<<_GREY_BSHIFT)
+#define _GREY_BMASK (_GREY_BSIZE-1)
+
 /* The greyscale buffer management structure */
 struct _grey_info
 {