1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
|
/* Copyright (C) 2000-2002 Damir Zucic */
/*=============================================================================
weight_colors.c
Purpose:
Weight two colors to prepare the third color.
Input:
(1) The first color identifier.
(2) The second color identifier.
(3) Scale factor (double), which weights the second color.
(4) Pointer to GUIS structure.
Output:
Return value.
Return value:
The identifier of the prepared (new) color.
=============================================================================*/
#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"
/*======weight two colors:===================================================*/
unsigned long WeightColors_ (unsigned long color1ID, unsigned long color2ID,
double scale_factor, GUIS *guiSP)
{
static unsigned long new_colorID;
static unsigned long red_mask, green_mask, blue_mask;
static unsigned long red1, red2, green1, green2, blue1, blue2;
static long double r1, r2, g1, g2, b1, b2;
static long double r, g, b;
static unsigned long red, green, blue;
/* 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 = (long double) red1;
r2 = (long double) red2;
g1 = (long double) green1;
g2 = (long double) green2;
b1 = (long double) blue1;
b2 = (long double) blue2;
/* Calculate new color components: */
r = r1 + scale_factor * (r2 - r1);
g = g1 + scale_factor * (g2 - g1);
b = b1 + scale_factor * (b2 - b1);
red = ((unsigned long) r) & red_mask;
green = ((unsigned long) g) & green_mask;
blue = ((unsigned long) b) & blue_mask;
/* Combine new color components: */
new_colorID = red | green | blue;
/* Return the identifier of the prepared color: */
return new_colorID;
}
/*===========================================================================*/
|