ported r819 from volker_dev

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@915 3ae390bd-cb1e-0410-b409-cd5a39f66f1f

diff --git a/drv_X11.c b/drv_X11.c
index e676b90994e5a9a352634ad84bdd0ceb5c92c8b9..0c6e41bc9d44895d978df763c321f9fc0ca018df 100644 (file)
--- a/drv_X11.c
+++ b/drv_X11.c
@@ -148,26 +148,30 @@ static int drv_X11_brightness(int brightness)
        brightness = 0;
     if (brightness > 255)
        brightness = 255;
-    Brightness = brightness;
-    dim = Brightness / 255.0;
-    col.R *= dim;
-    col.G *= dim;
-    col.B *= dim;
-
-    debug("%s: set backlight to %d%%, original backlight color: 0x%02x%02x%02x%02x, dimmed: 0x%02x%02x%02x%02x",
-         Name, (int) (dim * 100), BL_COL.R, BL_COL.G, BL_COL.B, BL_COL.A, col.R, col.G, col.B, col.A);
-    for (i = 0; i < DCOLS * DROWS; i++) {
-       drv_X11_FB[i] = col;
-    }
 
-    drv_X11_color(col);
+    if (Brightness != brightness) {
 
-    XFillRectangle(dp, pm, gc, 0, 0, dimx + 2 * border + btnwidth, dimy + 2 * border);
-    XSetWindowBackground(dp, w, xc.pixel);
-    XClearWindow(dp, w);
+       Brightness = brightness;
+       dim = Brightness / 255.0;
+       col.R *= dim;
+       col.G *= dim;
+       col.B *= dim;
 
-    /* redraw every LCD pixel */
-    drv_X11_blit(0, 0, LROWS, LCOLS);
+       debug("%s: set backlight to %d%%, original backlight color: 0x%02x%02x%02x%02x, dimmed: 0x%02x%02x%02x%02x",
+             Name, (int) (dim * 100), BL_COL.R, BL_COL.G, BL_COL.B, BL_COL.A, col.R, col.G, col.B, col.A);
+       for (i = 0; i < DCOLS * DROWS; i++) {
+           drv_X11_FB[i] = col;
+       }
+
+       drv_X11_color(col);
+
+       XFillRectangle(dp, pm, gc, 0, 0, dimx + 2 * border + btnwidth, dimy + 2 * border);
+       XSetWindowBackground(dp, w, xc.pixel);
+       XClearWindow(dp, w);
+
+       /* redraw every LCD pixel */
+       drv_X11_blit(0, 0, LROWS, LCOLS);
+    }
 
     return Brightness;
 }