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/* Copyright (C) 2000 Damir Zucic */
/*=============================================================================
interpolate_color.c
Purpose:
Interpolate (calculate) additional color, using two old colors.
Input:
(1) The first input color.
(2) The second input color.
(3) Pointer to GUIS structure.
Output:
(1) Return value.
Return value:
The pixel value calculated.
=============================================================================*/
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xos.h>
#include <X11/Xatom.h>
#include "defines.h"
#include "typedefs.h"
/*======interpolate color:===================================================*/
unsigned long InterpolateColor_ (unsigned long color1ID,
unsigned long color2ID,
GUIS *guiSP)
{
unsigned long colorID;
unsigned long red_mask, green_mask, blue_mask;
unsigned long red1, red2, red;
unsigned long green1, green2, green;
unsigned long blue1, blue2, blue;
double r1, r2, g1, g2, b1, b2;
double w = 0.5;
double r, g, b;
/* Copy masks: */
red_mask = guiSP->visual_infoS.red_mask;
green_mask = guiSP->visual_infoS.green_mask;
blue_mask = guiSP->visual_infoS.blue_mask;
/* Extract input color components: */
red1 = color1ID & red_mask;
red2 = color2ID & red_mask;
green1 = color1ID & green_mask;
green2 = color2ID & green_mask;
blue1 = color1ID & blue_mask;
blue2 = color2ID & blue_mask;
/* Convert to doubles: */
r1 = (double) red1;
r2 = (double) red2;
g1 = (double) green1;
g2 = (double) green2;
b1 = (double) blue1;
b2 = (double) blue2;
/* Calculate new color components: */
r = w * (r1 + r2);
g = w * (g1 + g2);
b = w * (b1 + b2);
red = ((unsigned long) r) & red_mask;
green = ((unsigned long) g) & green_mask;
blue = ((unsigned long) b) & blue_mask;
/* Combine new color components: */
colorID = red | green | blue;
/* Return the pixel value: */
return colorID;
}
/*===========================================================================*/
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