e200: Use cached memory for the yuv chroma buffer. Gives some speedup. Align lcd_driver_framebuffer to the same alignment as lcd_framebuffer. The need for this became apparent when the first change cause aligment & 3 != 0 and the screen was wrapped one pixel right with a black pixel at (0, 0).

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13161 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 3 insertions, 2 deletions

diff --git a/firmware/target/arm/sandisk/sansa-e200/lcd-e200.c b/firmware/target/arm/sandisk/sansa-e200/lcd-e200.c
index 93d79633b1..3748b73fb3 100644
--- a/firmware/target/arm/sandisk/sansa-e200/lcd-e200.c
+++ b/firmware/target/arm/sandisk/sansa-e200/lcd-e200.c
@@ -52,7 +52,8 @@
 /* We don't know how to receive a DMA finished signal from the LCD controller
  * To avoid problems with flickering, we double-buffer the framebuffer and turn
  * off DMA while updates are taking place */
-static fb_data lcd_driver_framebuffer[LCD_FBHEIGHT][LCD_FBWIDTH];
+static fb_data lcd_driver_framebuffer[LCD_FBHEIGHT][LCD_FBWIDTH]
+    __attribute__((aligned(16))); /* Same alignment as in lcd-16bit.c */
 
 static inline void lcd_init_gpio(void)
 {
@@ -334,7 +335,7 @@ void lcd_yuv_blit(unsigned char * const src[3],
 {
     /* Caches for chroma data so it only need be recaculated every other
        line */
-    unsigned char chroma_buf[LCD_HEIGHT/2*3]; /* 480 bytes */
+    static unsigned char chroma_buf[LCD_HEIGHT/2*3]; /* 330 bytes */
     unsigned char const * yuv_src[3];
     off_t z;