224 lines
6.5 KiB
C
224 lines
6.5 KiB
C
/* LIBPIKA - The PIKA 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 3 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, see
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* <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <glib-object.h>
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#include "libpikamath/pikamath.h"
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#include "pikacolortypes.h"
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#include "pikacmyk.h"
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/**
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* SECTION: pikacmyk
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* @title: PikaCMYK
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* @short_description: Definitions and Functions relating to CMYK colors.
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*
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* Definitions and Functions relating to CMYK colors.
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**/
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/*
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* PIKA_TYPE_CMYK
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*/
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static PikaCMYK * pika_cmyk_copy (const PikaCMYK *cmyk);
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G_DEFINE_BOXED_TYPE (PikaCMYK, pika_cmyk, pika_cmyk_copy, g_free)
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static PikaCMYK *
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pika_cmyk_copy (const PikaCMYK *cmyk)
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{
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return g_memdup2 (cmyk, sizeof (PikaCMYK));
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}
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/* CMYK functions */
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/**
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* pika_cmyk_set:
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* @cmyk: A #PikaCMYK structure which will hold the specified CMYK value.
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* @cyan: The Cyan channel of the CMYK value
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* @magenta: The Magenta channel
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* @yellow: The Yellow channel
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* @black: The blacK channel
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*
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* Very basic initialiser for the internal #PikaCMYK structure. Channel
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* values are doubles in the range 0 to 1.
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**/
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void
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pika_cmyk_set (PikaCMYK *cmyk,
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gdouble cyan,
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gdouble magenta,
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gdouble yellow,
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gdouble black)
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{
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g_return_if_fail (cmyk != NULL);
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cmyk->c = cyan;
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cmyk->m = magenta;
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cmyk->y = yellow;
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cmyk->k = black;
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}
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/**
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* pika_cmyk_set_uchar:
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* @cmyk: A #PikaCMYK structure which will hold the specified CMYK value.
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* @cyan: The Cyan channel of the CMYK value
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* @magenta: The Magenta channel
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* @yellow: The Yellow channel
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* @black: The blacK channel
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*
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* The same as pika_cmyk_set(), except that channel values are
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* unsigned chars in the range 0 to 255.
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**/
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void
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pika_cmyk_set_uchar (PikaCMYK *cmyk,
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guchar cyan,
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guchar magenta,
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guchar yellow,
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guchar black)
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{
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g_return_if_fail (cmyk != NULL);
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cmyk->c = (gdouble) cyan / 255.0;
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cmyk->m = (gdouble) magenta / 255.0;
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cmyk->y = (gdouble) yellow / 255.0;
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cmyk->k = (gdouble) black / 255.0;
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}
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/**
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* pika_cmyk_get_uchar:
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* @cmyk: A #PikaCMYK structure which will hold the specified CMYK value.
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* @cyan: (out) (optional): The Cyan channel of the CMYK value
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* @magenta: (out) (optional): The Magenta channel
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* @yellow: (out) (optional): The Yellow channel
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* @black: (out) (optional): The blacK channel
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*
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* Retrieve individual channel values from a #PikaCMYK structure. Channel
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* values are pointers to unsigned chars in the range 0 to 255.
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**/
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void
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pika_cmyk_get_uchar (const PikaCMYK *cmyk,
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guchar *cyan,
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guchar *magenta,
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guchar *yellow,
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guchar *black)
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{
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g_return_if_fail (cmyk != NULL);
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if (cyan) *cyan = ROUND (CLAMP (cmyk->c, 0.0, 1.0) * 255.0);
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if (magenta) *magenta = ROUND (CLAMP (cmyk->m, 0.0, 1.0) * 255.0);
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if (yellow) *yellow = ROUND (CLAMP (cmyk->y, 0.0, 1.0) * 255.0);
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if (black) *black = ROUND (CLAMP (cmyk->k, 0.0, 1.0) * 255.0);
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}
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/* CMYKA functions */
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/**
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* pika_cmyka_set:
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* @cmyka: A #PikaCMYK structure which will hold the specified CMYKA value.
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* @cyan: The Cyan channel of the CMYK value
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* @magenta: The Magenta channel
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* @yellow: The Yellow channel
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* @black: The blacK channel
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* @alpha: The Alpha channel
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*
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* Initialiser for the internal #PikaCMYK structure. Channel values are
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* doubles in the range 0 to 1.
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**/
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void
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pika_cmyka_set (PikaCMYK *cmyka,
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gdouble cyan,
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gdouble magenta,
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gdouble yellow,
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gdouble black,
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gdouble alpha)
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{
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g_return_if_fail (cmyka != NULL);
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cmyka->c = cyan;
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cmyka->m = magenta;
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cmyka->y = yellow;
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cmyka->k = black;
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cmyka->a = alpha;
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}
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/**
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* pika_cmyka_set_uchar:
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* @cmyka: A #PikaCMYK structure which will hold the specified CMYKA value.
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* @cyan: The Cyan channel of the CMYK value
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* @magenta: The Magenta channel
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* @yellow: The Yellow channel
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* @black: The blacK channel
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* @alpha: The Alpha channel
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*
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* The same as pika_cmyka_set(), except that channel values are
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* unsigned chars in the range 0 to 255.
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**/
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void
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pika_cmyka_set_uchar (PikaCMYK *cmyka,
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guchar cyan,
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guchar magenta,
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guchar yellow,
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guchar black,
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guchar alpha)
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{
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g_return_if_fail (cmyka != NULL);
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cmyka->c = (gdouble) cyan / 255.0;
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cmyka->m = (gdouble) magenta / 255.0;
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cmyka->y = (gdouble) yellow / 255.0;
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cmyka->k = (gdouble) black / 255.0;
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cmyka->a = (gdouble) alpha / 255.0;
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}
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/**
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* pika_cmyka_get_uchar:
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* @cmyka: A #PikaCMYK structure which will hold the specified CMYKA value.
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* @cyan: (out) (optional): The Cyan channel of the CMYK value
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* @magenta: (out) (optional): The Magenta channel
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* @yellow: (out) (optional): The Yellow channel
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* @black: (out) (optional): The blacK channel
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* @alpha: (out) (optional): The Alpha channel
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*
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* Retrieve individual channel values from a #PikaCMYK structure.
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* Channel values are pointers to unsigned chars in the range 0 to 255.
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**/
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void
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pika_cmyka_get_uchar (const PikaCMYK *cmyka,
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guchar *cyan,
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guchar *magenta,
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guchar *yellow,
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guchar *black,
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guchar *alpha)
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{
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g_return_if_fail (cmyka != NULL);
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if (cyan) *cyan = ROUND (CLAMP (cmyka->c, 0.0, 1.0) * 255.0);
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if (magenta) *magenta = ROUND (CLAMP (cmyka->m, 0.0, 1.0) * 255.0);
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if (yellow) *yellow = ROUND (CLAMP (cmyka->y, 0.0, 1.0) * 255.0);
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if (black) *black = ROUND (CLAMP (cmyka->k, 0.0, 1.0) * 255.0);
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if (alpha) *alpha = ROUND (CLAMP (cmyka->a, 0.0, 1.0) * 255.0);
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}
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