LCD drivers: * Automatically optimise horizontal and vertical lines drawn via _drawline(), with debug message to show possible optimisations in the caller. * Get rid of the extra ICODE function declarations by putting the attribute into the definition.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17081 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 13 insertions, 0 deletions

diff --git a/firmware/drivers/lcd-2bit-vi.c b/firmware/drivers/lcd-2bit-vi.c
index 0878258e84..7d97f19174 100644
--- a/firmware/drivers/lcd-2bit-vi.c
+++ b/firmware/drivers/lcd-2bit-vi.c
@@ -39,6 +39,7 @@
 #define LCDFN(fn) lcd_ ## fn
 #define FBFN(fn)  fb_ ## fn
 #define LCDM(ma)  LCD_ ## ma
+#define LCDNAME "lcd_"
 #define MAIN_LCD
 #endif
 
@@ -476,7 +477,19 @@ void LCDFN(drawline)(int x1, int y1, int x2, int y2)
     LCDFN(pixelfunc_type) *pfunc = LCDFN(pixelfuncs)[current_vp->drawmode];
 
     deltax = abs(x2 - x1);
+    if (deltax == 0)
+    {
+        DEBUGF(LCDNAME "drawline() called for vertical line - optimisation.\n");
+        LCDFN(vline)(x1, y1, y2);
+        return;
+    }
     deltay = abs(y2 - y1);
+    if (deltay == 0)
+    {
+        DEBUGF(LCDNAME "drawline() called for horizontal line - optimisation.\n");
+        LCDFN(hline)(x1, x2, y1);
+        return;
+    }
     xinc2 = 1;
     yinc2 = 1;