Speed up lcd_update_rect by ~2.5% by counting towards 0 in the loop.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23329 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 6 insertions, 2 deletions

diff --git a/firmware/target/arm/as3525/sansa-e200v2/lcd-e200v2.c b/firmware/target/arm/as3525/sansa-e200v2/lcd-e200v2.c
index 7c3ccc2c0b..24fc4eae57 100644
--- a/firmware/target/arm/as3525/sansa-e200v2/lcd-e200v2.c
+++ b/firmware/target/arm/as3525/sansa-e200v2/lcd-e200v2.c
@@ -556,12 +556,15 @@ void lcd_update_rect(int x, int y, int width, int height)
 
     ptr = (fb_data*)&lcd_framebuffer[y][x];
 
+    
+    height = ymax - y - 1; /* fix height */
+
     do
     {
         lcd_write_data(ptr, width);
         ptr += LCD_WIDTH;
     }
-    while (++y <= ymax);
+    while (--height > 0);
 
     lcd_busy = false;
 } /* lcd_update_rect */
diff --git a/firmware/target/arm/as3525/sansa-fuze/lcd-fuze.c b/firmware/target/arm/as3525/sansa-fuze/lcd-fuze.c
index 21ecdf8afa..c22382f19c 100644
--- a/firmware/target/arm/as3525/sansa-fuze/lcd-fuze.c
+++ b/firmware/target/arm/as3525/sansa-fuze/lcd-fuze.c
@@ -405,12 +405,13 @@ void lcd_update_rect(int x, int y, int width, int height)
 
     ptr = &lcd_framebuffer[y][x];
 
+    height = ymax - y - 1; /* fix height */
     do
     {
         lcd_write_data(ptr, width);
         ptr += LCD_WIDTH;
     }
-    while (++y <= ymax);
+    while (--height > 0);
     lcd_busy = false;
 }