PIKApp/libpikacolor/pikacmyk.c

224 lines
6.5 KiB
C

/* LIBPIKA - The PIKA 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 <glib-object.h>
#include "libpikamath/pikamath.h"
#include "pikacolortypes.h"
#include "pikacmyk.h"
/**
* SECTION: pikacmyk
* @title: PikaCMYK
* @short_description: Definitions and Functions relating to CMYK colors.
*
* Definitions and Functions relating to CMYK colors.
**/
/*
* PIKA_TYPE_CMYK
*/
static PikaCMYK * pika_cmyk_copy (const PikaCMYK *cmyk);
G_DEFINE_BOXED_TYPE (PikaCMYK, pika_cmyk, pika_cmyk_copy, g_free)
static PikaCMYK *
pika_cmyk_copy (const PikaCMYK *cmyk)
{
return g_memdup2 (cmyk, sizeof (PikaCMYK));
}
/* CMYK functions */
/**
* pika_cmyk_set:
* @cmyk: A #PikaCMYK structure which will hold the specified CMYK value.
* @cyan: The Cyan channel of the CMYK value
* @magenta: The Magenta channel
* @yellow: The Yellow channel
* @black: The blacK channel
*
* Very basic initialiser for the internal #PikaCMYK structure. Channel
* values are doubles in the range 0 to 1.
**/
void
pika_cmyk_set (PikaCMYK *cmyk,
gdouble cyan,
gdouble magenta,
gdouble yellow,
gdouble black)
{
g_return_if_fail (cmyk != NULL);
cmyk->c = cyan;
cmyk->m = magenta;
cmyk->y = yellow;
cmyk->k = black;
}
/**
* pika_cmyk_set_uchar:
* @cmyk: A #PikaCMYK structure which will hold the specified CMYK value.
* @cyan: The Cyan channel of the CMYK value
* @magenta: The Magenta channel
* @yellow: The Yellow channel
* @black: The blacK channel
*
* The same as pika_cmyk_set(), except that channel values are
* unsigned chars in the range 0 to 255.
**/
void
pika_cmyk_set_uchar (PikaCMYK *cmyk,
guchar cyan,
guchar magenta,
guchar yellow,
guchar black)
{
g_return_if_fail (cmyk != NULL);
cmyk->c = (gdouble) cyan / 255.0;
cmyk->m = (gdouble) magenta / 255.0;
cmyk->y = (gdouble) yellow / 255.0;
cmyk->k = (gdouble) black / 255.0;
}
/**
* pika_cmyk_get_uchar:
* @cmyk: A #PikaCMYK structure which will hold the specified CMYK value.
* @cyan: (out) (optional): The Cyan channel of the CMYK value
* @magenta: (out) (optional): The Magenta channel
* @yellow: (out) (optional): The Yellow channel
* @black: (out) (optional): The blacK channel
*
* Retrieve individual channel values from a #PikaCMYK structure. Channel
* values are pointers to unsigned chars in the range 0 to 255.
**/
void
pika_cmyk_get_uchar (const PikaCMYK *cmyk,
guchar *cyan,
guchar *magenta,
guchar *yellow,
guchar *black)
{
g_return_if_fail (cmyk != NULL);
if (cyan) *cyan = ROUND (CLAMP (cmyk->c, 0.0, 1.0) * 255.0);
if (magenta) *magenta = ROUND (CLAMP (cmyk->m, 0.0, 1.0) * 255.0);
if (yellow) *yellow = ROUND (CLAMP (cmyk->y, 0.0, 1.0) * 255.0);
if (black) *black = ROUND (CLAMP (cmyk->k, 0.0, 1.0) * 255.0);
}
/* CMYKA functions */
/**
* pika_cmyka_set:
* @cmyka: A #PikaCMYK structure which will hold the specified CMYKA value.
* @cyan: The Cyan channel of the CMYK value
* @magenta: The Magenta channel
* @yellow: The Yellow channel
* @black: The blacK channel
* @alpha: The Alpha channel
*
* Initialiser for the internal #PikaCMYK structure. Channel values are
* doubles in the range 0 to 1.
**/
void
pika_cmyka_set (PikaCMYK *cmyka,
gdouble cyan,
gdouble magenta,
gdouble yellow,
gdouble black,
gdouble alpha)
{
g_return_if_fail (cmyka != NULL);
cmyka->c = cyan;
cmyka->m = magenta;
cmyka->y = yellow;
cmyka->k = black;
cmyka->a = alpha;
}
/**
* pika_cmyka_set_uchar:
* @cmyka: A #PikaCMYK structure which will hold the specified CMYKA value.
* @cyan: The Cyan channel of the CMYK value
* @magenta: The Magenta channel
* @yellow: The Yellow channel
* @black: The blacK channel
* @alpha: The Alpha channel
*
* The same as pika_cmyka_set(), except that channel values are
* unsigned chars in the range 0 to 255.
**/
void
pika_cmyka_set_uchar (PikaCMYK *cmyka,
guchar cyan,
guchar magenta,
guchar yellow,
guchar black,
guchar alpha)
{
g_return_if_fail (cmyka != NULL);
cmyka->c = (gdouble) cyan / 255.0;
cmyka->m = (gdouble) magenta / 255.0;
cmyka->y = (gdouble) yellow / 255.0;
cmyka->k = (gdouble) black / 255.0;
cmyka->a = (gdouble) alpha / 255.0;
}
/**
* pika_cmyka_get_uchar:
* @cmyka: A #PikaCMYK structure which will hold the specified CMYKA value.
* @cyan: (out) (optional): The Cyan channel of the CMYK value
* @magenta: (out) (optional): The Magenta channel
* @yellow: (out) (optional): The Yellow channel
* @black: (out) (optional): The blacK channel
* @alpha: (out) (optional): The Alpha channel
*
* Retrieve individual channel values from a #PikaCMYK structure.
* Channel values are pointers to unsigned chars in the range 0 to 255.
**/
void
pika_cmyka_get_uchar (const PikaCMYK *cmyka,
guchar *cyan,
guchar *magenta,
guchar *yellow,
guchar *black,
guchar *alpha)
{
g_return_if_fail (cmyka != NULL);
if (cyan) *cyan = ROUND (CLAMP (cmyka->c, 0.0, 1.0) * 255.0);
if (magenta) *magenta = ROUND (CLAMP (cmyka->m, 0.0, 1.0) * 255.0);
if (yellow) *yellow = ROUND (CLAMP (cmyka->y, 0.0, 1.0) * 255.0);
if (black) *black = ROUND (CLAMP (cmyka->k, 0.0, 1.0) * 255.0);
if (alpha) *alpha = ROUND (CLAMP (cmyka->a, 0.0, 1.0) * 255.0);
}