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gimp/libgimpcolor/gimprgb.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* 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 Lesser General Public
* License along with this library. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <babl/babl.h>
#include <glib-object.h>
#define GIMP_DISABLE_DEPRECATION_WARNINGS /* for GIMP_RGB_INTENSITY() */
#include "libgimpmath/gimpmath.h"
#include "gimpcolortypes.h"
#undef GIMP_DISABLE_DEPRECATED /* for GIMP_RGB_INTENSITY() */
#include "gimprgb.h"
/**
* SECTION: gimprgb
* @title: GimpRGB
* @short_description: Definitions and Functions relating to RGB colors.
*
* Definitions and Functions relating to RGB colors.
**/
/*
* GIMP_TYPE_RGB
*/
static GimpRGB * gimp_rgb_copy (const GimpRGB *rgb);
GType
gimp_rgb_get_type (void)
{
static GType rgb_type = 0;
if (!rgb_type)
rgb_type = g_boxed_type_register_static ("GimpRGB",
(GBoxedCopyFunc) gimp_rgb_copy,
(GBoxedFreeFunc) g_free);
return rgb_type;
}
void
gimp_value_get_rgb (const GValue *value,
GimpRGB *rgb)
{
g_return_if_fail (GIMP_VALUE_HOLDS_RGB (value));
g_return_if_fail (rgb != NULL);
if (value->data[0].v_pointer)
*rgb = *((GimpRGB *) value->data[0].v_pointer);
else
gimp_rgba_set (rgb, 0.0, 0.0, 0.0, 1.0);
}
void
gimp_value_set_rgb (GValue *value,
const GimpRGB *rgb)
{
g_return_if_fail (GIMP_VALUE_HOLDS_RGB (value));
g_return_if_fail (rgb != NULL);
g_value_set_boxed (value, rgb);
}
static GimpRGB *
gimp_rgb_copy (const GimpRGB *rgb)
{
return g_memdup (rgb, sizeof (GimpRGB));
}
/* RGB functions */
/**
* gimp_rgb_set:
* @rgb: a #GimpRGB struct
* @red: the red component
* @green: the green component
* @blue: the blue component
*
* Sets the red, green and blue components of @rgb and leaves the
* alpha component unchanged. The color values should be between 0.0
* and 1.0 but there is no check to enforce this and the values are
* set exactly as they are passed in.
**/
void
gimp_rgb_set (GimpRGB *rgb,
gdouble r,
gdouble g,
gdouble b)
{
g_return_if_fail (rgb != NULL);
rgb->r = r;
rgb->g = g;
rgb->b = b;
}
/**
* gimp_rgb_set_alpha:
* @rgb: a #GimpRGB struct
* @alpha: the alpha component
*
* Sets the alpha component of @rgb and leaves the RGB components unchanged.
**/
void
gimp_rgb_set_alpha (GimpRGB *rgb,
gdouble a)
{
g_return_if_fail (rgb != NULL);
rgb->a = a;
}
/**
* gimp_rgb_set_pixel:
* @rgb: a #GimpRGB struct
* @format: a Babl format
* @pixel: pointer to the source pixel
*
* Sets the red, green and blue components of @rgb from the color
* stored in @pixel. The pixel format of @pixel is determined by
* @format.
*
* Since: 2.10
**/
void
gimp_rgb_set_pixel (GimpRGB *rgb,
const Babl *format,
gconstpointer pixel)
{
g_return_if_fail (rgb != NULL);
g_return_if_fail (format != NULL);
g_return_if_fail (pixel != NULL);
babl_process (babl_fish (format,
babl_format ("R'G'B' double")),
pixel, rgb, 1);
}
/**
* gimp_rgb_get_pixel:
* @rgb: a #GimpRGB struct
* @format: a Babl format
* @pixel: pointer to the destination pixel
*
* Writes the red, green, blue and alpha components of @rgb to the
* color stored in @pixel. The pixel format of @pixel is determined by
* @format.
*
* Since: 2.10
**/
void
gimp_rgb_get_pixel (const GimpRGB *rgb,
const Babl *format,
gpointer pixel)
{
g_return_if_fail (rgb != NULL);
g_return_if_fail (format != NULL);
g_return_if_fail (pixel != NULL);
babl_process (babl_fish (babl_format ("R'G'B' double"),
format),
rgb, pixel, 1);
}
/**
* gimp_rgb_set_uchar:
* @rgb: a #GimpRGB struct
* @red: the red component
* @green: the green component
* @blue: the blue component
*
* Sets the red, green and blue components of @rgb from 8bit values
* (0 to 255) and leaves the alpha component unchanged.
**/
void
gimp_rgb_set_uchar (GimpRGB *rgb,
guchar r,
guchar g,
guchar b)
{
g_return_if_fail (rgb != NULL);
rgb->r = (gdouble) r / 255.0;
rgb->g = (gdouble) g / 255.0;
rgb->b = (gdouble) b / 255.0;
}
void
gimp_rgb_get_uchar (const GimpRGB *rgb,
guchar *r,
guchar *g,
guchar *b)
{
g_return_if_fail (rgb != NULL);
if (r) *r = ROUND (CLAMP (rgb->r, 0.0, 1.0) * 255.0);
if (g) *g = ROUND (CLAMP (rgb->g, 0.0, 1.0) * 255.0);
if (b) *b = ROUND (CLAMP (rgb->b, 0.0, 1.0) * 255.0);
}
void
gimp_rgb_add (GimpRGB *rgb1,
const GimpRGB *rgb2)
{
g_return_if_fail (rgb1 != NULL);
g_return_if_fail (rgb2 != NULL);
rgb1->r += rgb2->r;
rgb1->g += rgb2->g;
rgb1->b += rgb2->b;
}
void
gimp_rgb_subtract (GimpRGB *rgb1,
const GimpRGB *rgb2)
{
g_return_if_fail (rgb1 != NULL);
g_return_if_fail (rgb2 != NULL);
rgb1->r -= rgb2->r;
rgb1->g -= rgb2->g;
rgb1->b -= rgb2->b;
}
void
gimp_rgb_multiply (GimpRGB *rgb,
gdouble factor)
{
g_return_if_fail (rgb != NULL);
rgb->r *= factor;
rgb->g *= factor;
rgb->b *= factor;
}
gdouble
gimp_rgb_distance (const GimpRGB *rgb1,
const GimpRGB *rgb2)
{
g_return_val_if_fail (rgb1 != NULL, 0.0);
g_return_val_if_fail (rgb2 != NULL, 0.0);
return (fabs (rgb1->r - rgb2->r) +
fabs (rgb1->g - rgb2->g) +
fabs (rgb1->b - rgb2->b));
}
gdouble
gimp_rgb_max (const GimpRGB *rgb)
{
g_return_val_if_fail (rgb != NULL, 0.0);
if (rgb->r > rgb->g)
return (rgb->r > rgb->b) ? rgb->r : rgb->b;
else
return (rgb->g > rgb->b) ? rgb->g : rgb->b;
}
gdouble
gimp_rgb_min (const GimpRGB *rgb)
{
g_return_val_if_fail (rgb != NULL, 0.0);
if (rgb->r < rgb->g)
return (rgb->r < rgb->b) ? rgb->r : rgb->b;
else
return (rgb->g < rgb->b) ? rgb->g : rgb->b;
}
void
gimp_rgb_clamp (GimpRGB *rgb)
{
g_return_if_fail (rgb != NULL);
rgb->r = CLAMP (rgb->r, 0.0, 1.0);
rgb->g = CLAMP (rgb->g, 0.0, 1.0);
rgb->b = CLAMP (rgb->b, 0.0, 1.0);
rgb->a = CLAMP (rgb->a, 0.0, 1.0);
}
void
gimp_rgb_gamma (GimpRGB *rgb,
gdouble gamma)
{
gdouble ig;
g_return_if_fail (rgb != NULL);
if (gamma != 0.0)
ig = 1.0 / gamma;
else
ig = 0.0;
rgb->r = pow (rgb->r, ig);
rgb->g = pow (rgb->g, ig);
rgb->b = pow (rgb->b, ig);
}
/**
* gimp_rgb_luminance:
* @rgb: a #GimpRGB struct
*
* Return value: the luminous intensity of the range from 0.0 to 1.0.
*
* Since: 2.4
**/
gdouble
gimp_rgb_luminance (const GimpRGB *rgb)
{
gdouble luminance;
g_return_val_if_fail (rgb != NULL, 0.0);
luminance = GIMP_RGB_LUMINANCE (rgb->r, rgb->g, rgb->b);
return CLAMP (luminance, 0.0, 1.0);
}
/**
* gimp_rgb_luminance_uchar:
* @rgb: a #GimpRGB struct
*
* Return value: the luminous intensity in the range from 0 to 255.
*
* Since: 2.4
**/
guchar
gimp_rgb_luminance_uchar (const GimpRGB *rgb)
{
g_return_val_if_fail (rgb != NULL, 0);
return ROUND (gimp_rgb_luminance (rgb) * 255.0);
}
/**
* gimp_rgb_intensity:
* @rgb: a #GimpRGB struct
*
* This function is deprecated! Use gimp_rgb_luminance() instead.
*
* Return value: the intensity in the range from 0.0 to 1.0.
**/
gdouble
gimp_rgb_intensity (const GimpRGB *rgb)
{
gdouble intensity;
g_return_val_if_fail (rgb != NULL, 0.0);
intensity = GIMP_RGB_INTENSITY (rgb->r, rgb->g, rgb->b);
return CLAMP (intensity, 0.0, 1.0);
}
/**
* gimp_rgb_intensity_uchar:
* @rgb: a #GimpRGB struct
*
* This function is deprecated! Use gimp_rgb_luminance_uchar() instead.
*
* Return value: the intensity in the range from 0 to 255.
**/
guchar
gimp_rgb_intensity_uchar (const GimpRGB *rgb)
{
g_return_val_if_fail (rgb != NULL, 0);
return ROUND (gimp_rgb_intensity (rgb) * 255.0);
}
void
gimp_rgb_composite (GimpRGB *color1,
const GimpRGB *color2,
GimpRGBCompositeMode mode)
{
g_return_if_fail (color1 != NULL);
g_return_if_fail (color2 != NULL);
switch (mode)
{
case GIMP_RGB_COMPOSITE_NONE:
break;
case GIMP_RGB_COMPOSITE_NORMAL:
/* put color2 on top of color1 */
if (color2->a == 1.0)
{
*color1 = *color2;
}
else
{
gdouble factor = color1->a * (1.0 - color2->a);
color1->r = color1->r * factor + color2->r * color2->a;
color1->g = color1->g * factor + color2->g * color2->a;
color1->b = color1->b * factor + color2->b * color2->a;
color1->a = factor + color2->a;
}
break;
case GIMP_RGB_COMPOSITE_BEHIND:
/* put color2 below color1 */
if (color1->a < 1.0)
{
gdouble factor = color2->a * (1.0 - color1->a);
color1->r = color2->r * factor + color1->r * color1->a;
color1->g = color2->g * factor + color1->g * color1->a;
color1->b = color2->b * factor + color1->b * color1->a;
color1->a = factor + color1->a;
}
break;
}
}
/* RGBA functions */
/**
* gimp_rgba_set_pixel:
* @rgba: a #GimpRGB struct
* @format: a Babl format
* @pixel: pointer to the source pixel
*
* Sets the red, green, blue and alpha components of @rgba from the
* color stored in @pixel. The pixel format of @pixel is determined
* by @format.
*
* Since: 2.10
**/
void
gimp_rgba_set_pixel (GimpRGB *rgba,
const Babl *format,
gconstpointer pixel)
{
g_return_if_fail (rgba != NULL);
g_return_if_fail (format != NULL);
g_return_if_fail (pixel != NULL);
babl_process (babl_fish (format,
babl_format ("R'G'B'A double")),
pixel, rgba, 1);
}
/**
* gimp_rgba_get_pixel:
* @rgba: a #GimpRGB struct
* @format: a Babl format
* @pixel: pointer to the destination pixel
*
* Writes the red, green, blue and alpha components of @rgba to the
* color stored in @pixel. The pixel format of @pixel is determined by
* @format.
*
* Since: 2.10
**/
void
gimp_rgba_get_pixel (const GimpRGB *rgba,
const Babl *format,
gpointer pixel)
{
g_return_if_fail (rgba != NULL);
g_return_if_fail (format != NULL);
g_return_if_fail (pixel != NULL);
babl_process (babl_fish (babl_format ("R'G'B'A double"),
format),
rgba, pixel, 1);
}
/**
* gimp_rgba_set:
* @rgba: a #GimpRGB struct
* @red: the red component
* @green: the green component
* @blue: the blue component
* @alpha: the alpha component
*
* Sets the red, green, blue and alpha components of @rgb. The values
* should be between 0.0 and 1.0 but there is no check to enforce this
* and the values are set exactly as they are passed in.
**/
void
gimp_rgba_set (GimpRGB *rgba,
gdouble r,
gdouble g,
gdouble b,
gdouble a)
{
g_return_if_fail (rgba != NULL);
rgba->r = r;
rgba->g = g;
rgba->b = b;
rgba->a = a;
}
/**
* gimp_rgba_set_uchar:
* @rgba: a #GimpRGB struct
* @red: the red component
* @green: the green component
* @blue: the blue component
* @alpha: the alpha component
*
* Sets the red, green, blue and alpha components of @rgb from 8bit
* values (0 to 255).
**/
void
gimp_rgba_set_uchar (GimpRGB *rgba,
guchar r,
guchar g,
guchar b,
guchar a)
{
g_return_if_fail (rgba != NULL);
rgba->r = (gdouble) r / 255.0;
rgba->g = (gdouble) g / 255.0;
rgba->b = (gdouble) b / 255.0;
rgba->a = (gdouble) a / 255.0;
}
void
gimp_rgba_get_uchar (const GimpRGB *rgba,
guchar *r,
guchar *g,
guchar *b,
guchar *a)
{
g_return_if_fail (rgba != NULL);
if (r) *r = ROUND (CLAMP (rgba->r, 0.0, 1.0) * 255.0);
if (g) *g = ROUND (CLAMP (rgba->g, 0.0, 1.0) * 255.0);
if (b) *b = ROUND (CLAMP (rgba->b, 0.0, 1.0) * 255.0);
if (a) *a = ROUND (CLAMP (rgba->a, 0.0, 1.0) * 255.0);
}
void
gimp_rgba_add (GimpRGB *rgba1,
const GimpRGB *rgba2)
{
g_return_if_fail (rgba1 != NULL);
g_return_if_fail (rgba2 != NULL);
rgba1->r += rgba2->r;
rgba1->g += rgba2->g;
rgba1->b += rgba2->b;
rgba1->a += rgba2->a;
}
void
gimp_rgba_subtract (GimpRGB *rgba1,
const GimpRGB *rgba2)
{
g_return_if_fail (rgba1 != NULL);
g_return_if_fail (rgba2 != NULL);
rgba1->r -= rgba2->r;
rgba1->g -= rgba2->g;
rgba1->b -= rgba2->b;
rgba1->a -= rgba2->a;
}
void
gimp_rgba_multiply (GimpRGB *rgba,
gdouble factor)
{
g_return_if_fail (rgba != NULL);
rgba->r *= factor;
rgba->g *= factor;
rgba->b *= factor;
rgba->a *= factor;
}
gdouble
gimp_rgba_distance (const GimpRGB *rgba1,
const GimpRGB *rgba2)
{
g_return_val_if_fail (rgba1 != NULL, 0.0);
g_return_val_if_fail (rgba2 != NULL, 0.0);
return (fabs (rgba1->r - rgba2->r) +
fabs (rgba1->g - rgba2->g) +
fabs (rgba1->b - rgba2->b) +
fabs (rgba1->a - rgba2->a));
}
/*
* GIMP_TYPE_PARAM_RGB
*/
#define GIMP_PARAM_SPEC_RGB(pspec) (G_TYPE_CHECK_INSTANCE_CAST ((pspec), GIMP_TYPE_PARAM_RGB, GimpParamSpecRGB))
typedef struct _GimpParamSpecRGB GimpParamSpecRGB;
struct _GimpParamSpecRGB
{
GParamSpecBoxed parent_instance;
gboolean has_alpha;
gboolean validate; /* change this to enable [0.0...1.0] */
GimpRGB default_value;
};
static void gimp_param_rgb_class_init (GParamSpecClass *class);
static void gimp_param_rgb_init (GParamSpec *pspec);
static void gimp_param_rgb_set_default (GParamSpec *pspec,
GValue *value);
static gboolean gimp_param_rgb_validate (GParamSpec *pspec,
GValue *value);
static gint gimp_param_rgb_values_cmp (GParamSpec *pspec,
const GValue *value1,
const GValue *value2);
/**
* gimp_param_rgb_get_type:
*
* Reveals the object type
*
* Returns: the #GType for a GimpParamRGB object
*
* Since: 2.4
**/
GType
gimp_param_rgb_get_type (void)
{
static GType spec_type = 0;
if (! spec_type)
{
const GTypeInfo type_info =
{
sizeof (GParamSpecClass),
NULL, NULL,
(GClassInitFunc) gimp_param_rgb_class_init,
NULL, NULL,
sizeof (GimpParamSpecRGB),
0,
(GInstanceInitFunc) gimp_param_rgb_init
};
spec_type = g_type_register_static (G_TYPE_PARAM_BOXED,
"GimpParamRGB",
&type_info, 0);
}
return spec_type;
}
static void
gimp_param_rgb_class_init (GParamSpecClass *class)
{
class->value_type = GIMP_TYPE_RGB;
class->value_set_default = gimp_param_rgb_set_default;
class->value_validate = gimp_param_rgb_validate;
class->values_cmp = gimp_param_rgb_values_cmp;
}
static void
gimp_param_rgb_init (GParamSpec *pspec)
{
GimpParamSpecRGB *cspec = GIMP_PARAM_SPEC_RGB (pspec);
gimp_rgba_set (&cspec->default_value, 0.0, 0.0, 0.0, 1.0);
}
static void
gimp_param_rgb_set_default (GParamSpec *pspec,
GValue *value)
{
GimpParamSpecRGB *cspec = GIMP_PARAM_SPEC_RGB (pspec);
g_value_set_static_boxed (value, &cspec->default_value);
}
static gboolean
gimp_param_rgb_validate (GParamSpec *pspec,
GValue *value)
{
GimpParamSpecRGB *rgb_spec = GIMP_PARAM_SPEC_RGB (pspec);
GimpRGB *rgb = value->data[0].v_pointer;
if (rgb_spec->validate && rgb)
{
GimpRGB oval = *rgb;
gimp_rgb_clamp (rgb);
return (oval.r != rgb->r ||
oval.g != rgb->g ||
oval.b != rgb->b ||
(rgb_spec->has_alpha && oval.a != rgb->a));
}
return FALSE;
}
static gint
gimp_param_rgb_values_cmp (GParamSpec *pspec,
const GValue *value1,
const GValue *value2)
{
GimpRGB *rgb1 = value1->data[0].v_pointer;
GimpRGB *rgb2 = value2->data[0].v_pointer;
/* try to return at least *something*, it's useless anyway... */
if (! rgb1)
{
return rgb2 != NULL ? -1 : 0;
}
else if (! rgb2)
{
return rgb1 != NULL;
}
else
{
guint32 int1 = 0;
guint32 int2 = 0;
if (GIMP_PARAM_SPEC_RGB (pspec)->has_alpha)
{
gimp_rgba_get_uchar (rgb1,
((guchar *) &int1) + 0,
((guchar *) &int1) + 1,
((guchar *) &int1) + 2,
((guchar *) &int1) + 3);
gimp_rgba_get_uchar (rgb2,
((guchar *) &int2) + 0,
((guchar *) &int2) + 1,
((guchar *) &int2) + 2,
((guchar *) &int2) + 3);
}
else
{
gimp_rgb_get_uchar (rgb1,
((guchar *) &int1) + 0,
((guchar *) &int1) + 1,
((guchar *) &int1) + 2);
gimp_rgb_get_uchar (rgb2,
((guchar *) &int2) + 0,
((guchar *) &int2) + 1,
((guchar *) &int2) + 2);
}
return int1 - int2;
}
}
/**
* gimp_param_spec_rgb:
* @name: Canonical name of the param
* @nick: Nickname of the param
* @blurb: Brief description of param.
* @has_alpha: %TRUE if the alpha channel has relevance.
* @default_value: Value to use if none is assigned.
* @flags: a combination of #GParamFlags
*
* Creates a param spec to hold an #GimpRGB value.
* See g_param_spec_internal() for more information.
*
* Returns: a newly allocated #GParamSpec instance
*
* Since: 2.4
**/
GParamSpec *
gimp_param_spec_rgb (const gchar *name,
const gchar *nick,
const gchar *blurb,
gboolean has_alpha,
const GimpRGB *default_value,
GParamFlags flags)
{
GimpParamSpecRGB *cspec;
cspec = g_param_spec_internal (GIMP_TYPE_PARAM_RGB,
name, nick, blurb, flags);
cspec->has_alpha = has_alpha;
if (default_value)
cspec->default_value = *default_value;
else
gimp_rgba_set (&cspec->default_value, 0.0, 0.0, 0.0, 1.0);
return G_PARAM_SPEC (cspec);
}
/**
* gimp_param_spec_rgb_get_default:
* @pspec: a #GimpParamSpecRGB.
* @default_value: return location for @pspec's default value
*
* Returns the @pspec's default color value.
*
* Since: 2.10.14
**/
void
gimp_param_spec_rgb_get_default (GParamSpec *pspec,
GimpRGB *default_value)
{
g_return_if_fail (GIMP_IS_PARAM_SPEC_RGB (pspec));
g_return_if_fail (default_value != NULL);
*default_value = GIMP_PARAM_SPEC_RGB (pspec)->default_value;
}
/**
* gimp_param_spec_rgb_has_alpha:
* @pspec: a #GParamSpec to hold an #GimpRGB value.
*
* Returns: %TRUE if the alpha channel is relevant.
*
* Since: 2.4
**/
gboolean
gimp_param_spec_rgb_has_alpha (GParamSpec *pspec)
{
g_return_val_if_fail (GIMP_IS_PARAM_SPEC_RGB (pspec), FALSE);
return GIMP_PARAM_SPEC_RGB (pspec)->has_alpha;
}
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