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/* Copyright (C) 2000 Damir Zucic */
/*=============================================================================
add_two_colors.c
Purpose:
Add (interpolate) two additional colors.
Input:
(1) The first input color.
(2) The second input color.
(3) Pointer to GUIS structure.
(4) Pointer to the first output color.
(5) Pointer to the second output color.
Output:
(1) The first output color prepared.
(2) The second output color prepared.
Return value:
No return value.
=============================================================================*/
#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"
/*======add (interpolate) two colors:========================================*/
void AddTwoColors_ (unsigned long input_color1ID,
unsigned long input_color2ID,
GUIS *guiSP,
unsigned long *output_color1IDP,
unsigned long *output_color2IDP)
{
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 w1, w2, 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 = input_color1ID & red_mask;
red2 = input_color2ID & red_mask;
green1 = input_color1ID & green_mask;
green2 = input_color2ID & green_mask;
blue1 = input_color1ID & blue_mask;
blue2 = input_color2ID & blue_mask;
/* Convert to doubles: */
r1 = (double) red1;
r2 = (double) red2;
g1 = (double) green1;
g2 = (double) green2;
b1 = (double) blue1;
b2 = (double) blue2;
/* Weighting factors: */
w1 = 2.0 / 3.0;
w2 = 1.0 / 3.0;
/* The first output color (components): */
r = w1 * r1 + w2 * r2;
g = w1 * g1 + w2 * g2;
b = w1 * b1 + w2 * b2;
red = ((unsigned long) r) & red_mask;
green = ((unsigned long) g) & green_mask;
blue = ((unsigned long) b) & blue_mask;
/* The first output color (value): */
*output_color1IDP = red | green | blue;
/* The second output color (components): */
r = w2 * r1 + w1 * r2;
g = w2 * g1 + w1 * g2;
b = w2 * b1 + w1 * b2;
red = ((unsigned long) r) & red_mask;
green = ((unsigned long) g) & green_mask;
blue = ((unsigned long) b) & blue_mask;
/* The second output color (value): */
*output_color2IDP = red | green | blue;
}
/*===========================================================================*/
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