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by Daniel Holbach
Import upstream version 2.2.9 |
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/* LIBGIMP - The GIMP Library
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* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "config.h" |
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#include <glib-object.h> |
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#include "libgimpmath/gimpmath.h" |
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#include "gimpcolortypes.h" |
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#include "gimprgb.h" |
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/* RGB type */
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static GimpRGB * rgb_copy (const GimpRGB *rgb); |
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GType
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gimp_rgb_get_type (void) |
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{
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static GType rgb_type = 0; |
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if (!rgb_type) |
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rgb_type = g_boxed_type_register_static ("GimpRGB", |
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(GBoxedCopyFunc) rgb_copy, |
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(GBoxedFreeFunc) g_free); |
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return rgb_type; |
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}
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static GimpRGB * |
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rgb_copy (const GimpRGB *rgb) |
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{
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return g_memdup (rgb, sizeof (GimpRGB)); |
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}
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/* RGB functions */
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/**
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* gimp_rgb_set:
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* @rgb: a #GimpRGB struct
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* @red:
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* @green:
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* @blue:
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*
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* Sets the red, green and blue components of @rgb and leaves the
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* alpha component unchanged. The color values should be between 0.0
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* and 1.0 but there is no check to enforce this and the values are
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* set exactly as they are passed in.
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**/
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void
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gimp_rgb_set (GimpRGB *rgb, |
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gdouble r, |
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gdouble g, |
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gdouble b) |
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{
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g_return_if_fail (rgb != NULL); |
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rgb->r = r; |
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rgb->g = g; |
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rgb->b = b; |
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}
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/**
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* gimp_rgb_set_alpha:
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* @rgb: a #GimpRGB struct
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* @alpha:
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*
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* Sets the alpha component of @rgb and leaves the RGB components unchanged.
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**/
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void
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gimp_rgb_set_alpha (GimpRGB *rgb, |
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gdouble a) |
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{
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g_return_if_fail (rgb != NULL); |
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rgb->a = a; |
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}
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/**
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* gimp_rgb_set_uchar:
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* @rgb: a #GimpRGB struct
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* @red:
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* @green:
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* @blue:
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*
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* Sets the red, green and blue components of @rgb from 8bit values
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* (0 to 255) and leaves the alpha component unchanged.
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**/
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void
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gimp_rgb_set_uchar (GimpRGB *rgb, |
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guchar r, |
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guchar g, |
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guchar b) |
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{
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g_return_if_fail (rgb != NULL); |
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rgb->r = (gdouble) r / 255.0; |
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rgb->g = (gdouble) g / 255.0; |
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rgb->b = (gdouble) b / 255.0; |
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}
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void
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gimp_rgb_get_uchar (const GimpRGB *rgb, |
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guchar *r, |
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guchar *g, |
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guchar *b) |
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{
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g_return_if_fail (rgb != NULL); |
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if (r) *r = ROUND (CLAMP (rgb->r, 0.0, 1.0) * 255.0); |
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if (g) *g = ROUND (CLAMP (rgb->g, 0.0, 1.0) * 255.0); |
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if (b) *b = ROUND (CLAMP (rgb->b, 0.0, 1.0) * 255.0); |
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}
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void
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gimp_rgb_add (GimpRGB *rgb1, |
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const GimpRGB *rgb2) |
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{
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g_return_if_fail (rgb1 != NULL); |
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g_return_if_fail (rgb2 != NULL); |
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rgb1->r += rgb2->r; |
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rgb1->g += rgb2->g; |
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rgb1->b += rgb2->b; |
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}
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void
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gimp_rgb_subtract (GimpRGB *rgb1, |
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const GimpRGB *rgb2) |
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{
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g_return_if_fail (rgb1 != NULL); |
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g_return_if_fail (rgb2 != NULL); |
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rgb1->r -= rgb2->r; |
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rgb1->g -= rgb2->g; |
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rgb1->b -= rgb2->b; |
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}
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void
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gimp_rgb_multiply (GimpRGB *rgb, |
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gdouble factor) |
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{
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g_return_if_fail (rgb != NULL); |
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rgb->r *= factor; |
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rgb->g *= factor; |
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rgb->b *= factor; |
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}
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gdouble
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gimp_rgb_distance (const GimpRGB *rgb1, |
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const GimpRGB *rgb2) |
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{
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g_return_val_if_fail (rgb1 != NULL, 0.0); |
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g_return_val_if_fail (rgb2 != NULL, 0.0); |
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return (fabs (rgb1->r - rgb2->r) + |
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fabs (rgb1->g - rgb2->g) + |
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fabs (rgb1->b - rgb2->b)); |
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}
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gdouble
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gimp_rgb_max (const GimpRGB *rgb) |
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{
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g_return_val_if_fail (rgb != NULL, 0.0); |
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if (rgb->r > rgb->g) |
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return (rgb->r > rgb->b) ? rgb->r : rgb->b; |
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return (rgb->g > rgb->b) ? rgb->g : rgb->b; |
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}
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gdouble
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gimp_rgb_min (const GimpRGB *rgb) |
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{
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g_return_val_if_fail (rgb != NULL, 0.0); |
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if (rgb->r < rgb->g) |
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return (rgb->r < rgb->b) ? rgb->r : rgb->b; |
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return (rgb->g < rgb->b) ? rgb->g : rgb->b; |
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}
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void
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gimp_rgb_clamp (GimpRGB *rgb) |
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{
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g_return_if_fail (rgb != NULL); |
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rgb->r = CLAMP (rgb->r, 0.0, 1.0); |
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rgb->g = CLAMP (rgb->g, 0.0, 1.0); |
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rgb->b = CLAMP (rgb->b, 0.0, 1.0); |
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rgb->a = CLAMP (rgb->a, 0.0, 1.0); |
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}
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void
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gimp_rgb_gamma (GimpRGB *rgb, |
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gdouble gamma) |
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{
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gdouble ig; |
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g_return_if_fail (rgb != NULL); |
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if (gamma != 0.0) |
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ig = 1.0 / gamma; |
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else
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ig = 0.0; |
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rgb->r = pow (rgb->r, ig); |
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rgb->g = pow (rgb->g, ig); |
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rgb->b = pow (rgb->b, ig); |
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}
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gdouble
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gimp_rgb_intensity (const GimpRGB *rgb) |
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{
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gdouble intensity; |
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g_return_val_if_fail (rgb != NULL, 0.0); |
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intensity = GIMP_RGB_INTENSITY (rgb->r, rgb->g, rgb->b); |
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return CLAMP (intensity, 0.0, 1.0); |
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}
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guchar
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gimp_rgb_intensity_uchar (const GimpRGB *rgb) |
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{
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g_return_val_if_fail (rgb != NULL, 0); |
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return ROUND (gimp_rgb_intensity (rgb) * 255.0); |
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}
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void
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gimp_rgb_composite (GimpRGB *color1, |
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const GimpRGB *color2, |
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GimpRGBCompositeMode mode) |
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{
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gdouble factor; |
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g_return_if_fail (color1 != NULL); |
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g_return_if_fail (color2 != NULL); |
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switch (mode) |
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{
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case GIMP_RGB_COMPOSITE_NONE: |
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break; |
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case GIMP_RGB_COMPOSITE_NORMAL: |
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/* put color2 on top of color1 */
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if (color2->a == 1.0) |
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{
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*color1 = *color2; |
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}
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else
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{
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factor = color1->a * (1.0 - color2->a); |
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color1->r = color1->r * factor + color2->r * color2->a; |
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color1->g = color1->g * factor + color2->g * color2->a; |
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color1->b = color1->b * factor + color2->b * color2->a; |
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color1->a = factor + color2->a; |
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}
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break; |
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case GIMP_RGB_COMPOSITE_BEHIND: |
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/* put color2 below color1 */
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if (color1->a < 1.0) |
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{
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factor = color2->a * (1.0 - color1->a); |
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color1->r = color2->r * factor + color1->r * color1->a; |
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color1->g = color2->g * factor + color1->g * color1->a; |
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color1->b = color2->b * factor + color1->b * color1->a; |
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color1->a = factor + color1->a; |
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}
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break; |
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}
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}
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/* RGBA functions */
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/**
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* gimp_rgba_set:
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* @rgba: a #GimpRGB struct
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* @red:
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* @green:
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* @blue:
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* @alpha:
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*
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* Sets the red, green, blue and alpha components of @rgb. The values
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* should be between 0.0 and 1.0 but there is no check to enforce this
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* and the values are set exactly as they are passed in.
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**/
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void
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gimp_rgba_set (GimpRGB *rgba, |
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gdouble r, |
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gdouble g, |
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gdouble b, |
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gdouble a) |
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{
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g_return_if_fail (rgba != NULL); |
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rgba->r = r; |
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rgba->g = g; |
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rgba->b = b; |
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rgba->a = a; |
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}
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/**
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* gimp_rgba_set_uchar:
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* @rgba: a #GimpRGB struct
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* @red:
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* @green:
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* @blue:
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* @alpha:
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*
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* Sets the red, green, blue and alpha components of @rgb from 8bit
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* values (0 to 255).
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**/
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void
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gimp_rgba_set_uchar (GimpRGB *rgba, |
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guchar r, |
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guchar g, |
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guchar b, |
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guchar a) |
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{
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g_return_if_fail (rgba != NULL); |
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rgba->r = (gdouble) r / 255.0; |
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rgba->g = (gdouble) g / 255.0; |
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rgba->b = (gdouble) b / 255.0; |
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rgba->a = (gdouble) a / 255.0; |
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}
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void
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gimp_rgba_get_uchar (const GimpRGB *rgba, |
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guchar *r, |
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guchar *g, |
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guchar *b, |
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guchar *a) |
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{
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g_return_if_fail (rgba != NULL); |
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if (r) *r = ROUND (CLAMP (rgba->r, 0.0, 1.0) * 255.0); |
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if (g) *g = ROUND (CLAMP (rgba->g, 0.0, 1.0) * 255.0); |
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if (b) *b = ROUND (CLAMP (rgba->b, 0.0, 1.0) * 255.0); |
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if (a) *a = ROUND (CLAMP (rgba->a, 0.0, 1.0) * 255.0); |
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}
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void
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gimp_rgba_add (GimpRGB *rgba1, |
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const GimpRGB *rgba2) |
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{
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g_return_if_fail (rgba1 != NULL); |
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g_return_if_fail (rgba2 != NULL); |
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rgba1->r += rgba2->r; |
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rgba1->g += rgba2->g; |
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rgba1->b += rgba2->b; |
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rgba1->a += rgba2->a; |
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}
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void
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gimp_rgba_subtract (GimpRGB *rgba1, |
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const GimpRGB *rgba2) |
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{
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g_return_if_fail (rgba1 != NULL); |
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g_return_if_fail (rgba2 != NULL); |
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rgba1->r -= rgba2->r; |
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rgba1->g -= rgba2->g; |
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rgba1->b -= rgba2->b; |
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rgba1->a -= rgba2->a; |
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}
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void
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gimp_rgba_multiply (GimpRGB *rgba, |
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gdouble factor) |
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{
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g_return_if_fail (rgba != NULL); |
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rgba->r *= factor; |
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rgba->g *= factor; |
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rgba->b *= factor; |
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rgba->a *= factor; |
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}
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gdouble
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gimp_rgba_distance (const GimpRGB *rgba1, |
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const GimpRGB *rgba2) |
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{
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g_return_val_if_fail (rgba1 != NULL, 0.0); |
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g_return_val_if_fail (rgba2 != NULL, 0.0); |
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return (fabs (rgba1->r - rgba2->r) + |
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fabs (rgba1->g - rgba2->g) + |
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fabs (rgba1->b - rgba2->b) + |
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fabs (rgba1->a - rgba2->a)); |
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}
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