The new function RgbShade() (include osd.h) can be used to generate a brighter or darker version of a given color

1 files changed, 9 insertions, 1 deletions

diff --git a/osd.h b/osd.h
index 9f951bbb..06c020aa 100644
--- a/osd.h
+++ b/osd.h
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: osd.h 2.16 2012/05/17 15:09:35 kls Exp $
+ * $Id: osd.h 2.17 2012/06/02 10:32:38 kls Exp $
  */
 
 #ifndef __OSD_H
@@ -70,6 +70,14 @@ inline tColor RgbToColor(double R, double G, double B)
   return RgbToColor(uint8_t(0xFF * R), uint8_t(0xFF * G), uint8_t(0xFF * B));
 }
 
+tColor RgbShade(tColor Color, double Factor);
+   ///< Returns a brighter (Factor > 0) or darker (Factor < 0) version
+   ///< of the given Color.
+   ///< If Factor is 0.0, the return value is the unchanged Color,
+   ///< If Factor is 1.0, white is returned.
+   ///< If Factor is -1.0, black is returned.
+   ///< The alpha value of Color is returned unchanged.
+
 tColor HsvToColor(double H, double S, double V);
    ///< Converts the given Hue (0..360), Saturation (0..1) and Value (0..1)
    ///< to an RGB tColor value. The alpha value of the result is 0x00, so