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/*************************************************************************
* Copyright (C) 2010 Tavian Barnes <tavianator@tavianator.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension 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. *
* *
* The Dimension 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 *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/**
* @file
* Color-mapped pigment patterns.
*/
#include "dimension.h"
dmnsn_map *
dmnsn_new_color_map(void)
{
return dmnsn_new_map(sizeof(dmnsn_color));
}
/** Payload for a color_map pigment. */
typedef struct dmnsn_color_map_payload {
dmnsn_pattern *pattern;
dmnsn_map *map;
} dmnsn_color_map_payload;
/** Free a color_map payload. */
static void
dmnsn_delete_color_map_payload(void *ptr)
{
dmnsn_color_map_payload *payload = ptr;
dmnsn_delete_map(payload->map);
dmnsn_delete_pattern(payload->pattern);
dmnsn_free(payload);
}
/** color_map pigment callback. */
static dmnsn_color
dmnsn_color_map_pigment_fn(const dmnsn_pigment *pigment, dmnsn_vector v)
{
const dmnsn_color_map_payload *payload = pigment->ptr;
double n;
dmnsn_color color1, color2;
dmnsn_evaluate_map(payload->map, dmnsn_pattern_value(payload->pattern, v),
&n, &color1, &color2);
return dmnsn_color_gradient(color1, color2, n);
}
/** color_map initialization callback. */
static void
dmnsn_color_map_initialize_fn(dmnsn_pigment *pigment)
{
dmnsn_color_map_payload *payload = pigment->ptr;
payload->pattern->trans = dmnsn_matrix_mul(pigment->trans,
payload->pattern->trans);
dmnsn_initialize_pattern(payload->pattern);
}
dmnsn_pigment *
dmnsn_new_color_map_pigment(dmnsn_pattern *pattern, dmnsn_map *map)
{
dmnsn_pigment *pigment = dmnsn_new_pigment();
dmnsn_color_map_payload *payload
= dmnsn_malloc(sizeof(dmnsn_color_map_payload));
payload->pattern = pattern;
payload->map = map;
pigment->pigment_fn = &dmnsn_color_map_pigment_fn;
pigment->initialize_fn = &dmnsn_color_map_initialize_fn;
pigment->free_fn = &dmnsn_delete_color_map_payload;
pigment->ptr = payload;
return pigment;
}
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