From 3291ae6bfac7a0cd39dafe12b006f73cbcb874d1 Mon Sep 17 00:00:00 2001
From: Jens Arnold <amiconn@rockbox.org>
Date: Sat, 2 Jul 2005 07:21:21 +0000
Subject: A couple of optimisations.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6981 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/drivers/lcd-recorder.c | 36 ++++++++++++++++++++++++------------
 1 file changed, 24 insertions(+), 12 deletions(-)

(limited to 'firmware/drivers/lcd-recorder.c')

diff --git a/firmware/drivers/lcd-recorder.c b/firmware/drivers/lcd-recorder.c
index f933e6ca5c..b857708514 100644
--- a/firmware/drivers/lcd-recorder.c
+++ b/firmware/drivers/lcd-recorder.c
@@ -549,7 +549,7 @@ void lcd_drawline(int x1, int y1, int x2, int y2)
 void lcd_hline(int x1, int x2, int y)
 {
     int x;
-    unsigned char *dst;
+    unsigned char *dst, *dst_end;
     unsigned mask;
     lcd_blockfunc_type *bfunc;
 
@@ -575,8 +575,10 @@ void lcd_hline(int x1, int x2, int y)
     dst   = &lcd_framebuffer[y>>3][x1];
     mask  = 1 << (y & 7);
 
-    for (x = x1; x <= x2; x++)
+    dst_end = dst + x2 - x1;
+    do
         bfunc(dst++, mask, 0xFFu);
+    while (dst <= dst_end);
 }
 
 /* Draw a vertical line (optimised) */
@@ -639,8 +641,8 @@ void lcd_drawrect(int x, int y, int width, int height)
 /* Fill a rectangular area */
 void lcd_fillrect(int x, int y, int width, int height)
 {
-    int ny, i;
-    unsigned char *dst;
+    int ny;
+    unsigned char *dst, *dst_end;
     unsigned mask, mask_bottom;
     unsigned bits = 0xFFu;
     lcd_blockfunc_type *bfunc;
@@ -685,8 +687,10 @@ void lcd_fillrect(int x, int y, int width, int height)
         {
             unsigned char *dst_row = dst;
 
-            for (i = width; i > 0; i--)
+            dst_end = dst_row + width;
+            do
                 bfunc(dst_row++, mask, 0xFFu);
+            while (dst_row < dst_end);
         }
 
         dst += LCD_WIDTH;
@@ -698,8 +702,10 @@ void lcd_fillrect(int x, int y, int width, int height)
         memset(dst, bits, width);
     else
     {
-        for (i = width; i > 0; i--)
+        dst_end = dst + width;
+        do
             bfunc(dst++, mask, 0xFFu);
+        while (dst < dst_end);
     }
 }
 
@@ -721,8 +727,8 @@ void lcd_bitmap_part(const unsigned char *src, int src_x, int src_y,
 void lcd_bitmap_part(const unsigned char *src, int src_x, int src_y,
                      int stride, int x, int y, int width, int height)
 {
-    int shift, ny, i;
-    unsigned char *dst;
+    int shift, ny;
+    unsigned char *dst, *dst_end;
     unsigned mask, mask_bottom;
     lcd_blockfunc_type *bfunc;
 
@@ -772,9 +778,11 @@ void lcd_bitmap_part(const unsigned char *src, int src_x, int src_y,
             {
                 const unsigned char *src_row = src;
                 unsigned char *dst_row = dst;
-
-                for (i = width; i > 0; i--)
+                
+                dst_end = dst_row + width;
+                do 
                     bfunc(dst_row++, mask, *src_row++);
+                while (dst_row < dst_end);
             }
 
             src += stride;
@@ -787,13 +795,16 @@ void lcd_bitmap_part(const unsigned char *src, int src_x, int src_y,
             memcpy(dst, src, width);
         else
         {
-            for (i = width; i > 0; i--)
+            dst_end = dst + width;
+            do
                 bfunc(dst++, mask, *src++);
+            while (dst < dst_end);
         }
     }
     else
     {
-        for (x = 0; x < width; x++)
+        dst_end = dst + width;
+        do
         {
             const unsigned char *src_col = src++;
             unsigned char *dst_col = dst++;
@@ -819,6 +830,7 @@ void lcd_bitmap_part(const unsigned char *src, int src_x, int src_y,
             data |= *src_col << shift;
             bfunc(dst_col, mask_col & mask_bottom, data);
         }
+        while (dst < dst_end);
     }
 }
 
-- 
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