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

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Klaus Schmidinger
2012-06-02 10:44:24 +02:00
parent 5ee947a492
commit 41b1160f01
3 changed files with 23 additions and 3 deletions
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12
osd.c
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@@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: osd.c 2.29 2012/05/17 13:29:19 kls Exp $
* $Id: osd.c 2.30 2012/06/02 10:42:23 kls Exp $
*/
#include "osd.h"
@@ -40,6 +40,16 @@ tColor HsvToColor(double H, double S, double V)
}
}
tColor RgbShade(tColor Color, double Factor)
{
double f = fabs(constrain(Factor, -1.0, 1.0));
double w = Factor > 0 ? f * 0xFF : 0;
return (Color & 0xFF000000) |
(min(0xFF, int((1 - f) * ((Color >> 16) & 0xFF) + w + 0.5)) << 16) |
(min(0xFF, int((1 - f) * ((Color >> 8) & 0xFF) + w + 0.5)) << 8) |
(min(0xFF, int((1 - f) * ( Color & 0xFF) + w + 0.5)) );
}
#define USE_ALPHA_LUT
#ifdef USE_ALPHA_LUT
// Alpha blending with lookup table (by Reinhard Nissl <rnissl@gmx.de>)