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Diffstat (limited to 'widgets/misc/e-hsv-utils.c')
| -rw-r--r-- | widgets/misc/e-hsv-utils.c | 178 |
1 files changed, 0 insertions, 178 deletions
diff --git a/widgets/misc/e-hsv-utils.c b/widgets/misc/e-hsv-utils.c deleted file mode 100644 index a5007b9b83..0000000000 --- a/widgets/misc/e-hsv-utils.c +++ /dev/null @@ -1,178 +0,0 @@ -/* -*- 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; - } -} - - |