Lcd save function pointer to frame buffer get_address_fn before loops

Calling multiple levels of indirection in a loop slows things down

Really these need to be rewritten to take a start and end address
like most of the rest of the codebase

But this is safer without having test hardware in hand

Change-Id: Idae7b92ee779d020ed7fcc9334e2d5a9c710e64d

1 files changed, 2 insertions, 1 deletions

diff --git a/firmware/target/arm/as3525/sansa-clipzip/lcd-clipzip.c b/firmware/target/arm/as3525/sansa-clipzip/lcd-clipzip.c
index 03ed1de5d5..48594a2ac9 100644
--- a/firmware/target/arm/as3525/sansa-clipzip/lcd-clipzip.c
+++ b/firmware/target/arm/as3525/sansa-clipzip/lcd-clipzip.c
@@ -440,9 +440,10 @@ void lcd_update_rect(int x, int y, int width, int height)
     /* setup GRAM write window */
     lcd_setup_rect(x, x_end - 1, y, y_end - 1);
 
+    void* (*fbaddr)(int x, int y) = FB_CURRENTVP_BUFFER->get_address_fn;
     /* write to GRAM */
     for (row = y; row < y_end; row++) {
-        lcd_write_data(FBADDR(x,row), width);
+        lcd_write_data(fbaddr(x,row), width);
     }
 }