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-rw-r--r--widgets/misc/e-hsv-utils.c178
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-/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
-/*
- * e-hsv-utils.c - utilites for manipulating colours in HSV space
- * Copyright (C) 1995-2001 Seth Nickell, Peter Mattis, Spencer Kimball and Josh MacDonald
- *
- * Authors:
- * Seth Nickell <seth@eazel.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License, version 2, as published by the Free Software Foundation.
- *
- * This library is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA.
- */
-
-#include <config.h>
-
-#include "e-hsv-utils.h"
-
-/* tweak_hsv is a really tweaky function. it modifies its first argument, which
- should be the colour you want tweaked. delta_h, delta_s and delta_v specify
- how much you want their respective channels modified (and in what direction).
- if it can't do the specified modification, it does it in the oppositon direction */
-void
-e_hsv_tweak (GdkColor *colour, gdouble delta_h, gdouble delta_s, gdouble delta_v)
-{
- gdouble h, s, v, r, g, b;
-
- r = colour->red / 65535.0f;
- g = colour->green / 65535.0f;
- b = colour->blue / 65535.0f;
-
- e_rgb_to_hsv (r, g, b, &h, &s, &v);
-
- if (h + delta_h < 0) {
- h -= delta_h;
- } else {
- h += delta_h;
- }
-
- if (s + delta_s < 0) {
- s -= delta_s;
- } else {
- s += delta_s;
- }
-
- if (v + delta_v < 0) {
- v -= delta_v;
- } else {
- v += delta_v;
- }
-
- e_hsv_to_rgb (h, s, v, &r, &g, &b);
-
- colour->red = r * 65535.0f;
- colour->green = g * 65535.0f;
- colour->blue = b * 65535.0f;
-}
-
-/* Copy n' Paste code from the GTK+ colour selector (gtkcolorsel.c) */
-/* Originally lifted, I suspect, from "Foley, van Dam" */
-void
-e_hsv_to_rgb (gdouble h, gdouble s, gdouble v,
- gdouble *r, gdouble *g, gdouble *b)
-{
- gint i;
- gdouble f, w, q, t;
-
- if (s == 0.0)
- s = 0.000001;
-
- if (h == -1.0)
- {
- *r = v;
- *g = v;
- *b = v;
- }
- else
- {
- if (h == 360.0)
- h = 0.0;
- h = h / 60.0;
- i = (gint) h;
- f = h - i;
- w = v * (1.0 - s);
- q = v * (1.0 - (s * f));
- t = v * (1.0 - (s * (1.0 - f)));
-
- switch (i)
- {
- case 0:
- *r = v;
- *g = t;
- *b = w;
- break;
- case 1:
- *r = q;
- *g = v;
- *b = w;
- break;
- case 2:
- *r = w;
- *g = v;
- *b = t;
- break;
- case 3:
- *r = w;
- *g = q;
- *b = v;
- break;
- case 4:
- *r = t;
- *g = w;
- *b = v;
- break;
- case 5:
- *r = v;
- *g = w;
- *b = q;
- break;
- }
- }
-}
-
-void
-e_rgb_to_hsv (gdouble r, gdouble g, gdouble b,
- gdouble *h, gdouble *s, gdouble *v)
-{
- double max, min, delta;
-
- max = r;
- if (g > max)
- max = g;
- if (b > max)
- max = b;
-
- min = r;
- if (g < min)
- min = g;
- if (b < min)
- min = b;
-
- *v = max;
-
- if (max != 0.0)
- *s = (max - min) / max;
- else
- *s = 0.0;
-
- if (*s == 0.0)
- *h = -1.0;
- else
- {
- delta = max - min;
-
- if (r == max)
- *h = (g - b) / delta;
- else if (g == max)
- *h = 2.0 + (b - r) / delta;
- else if (b == max)
- *h = 4.0 + (r - g) / delta;
-
- *h = *h * 60.0;
-
- if (*h < 0.0)
- *h = *h + 360;
- }
-}
-
-