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/*************************************************************************
* Copyright (C) 2009-2010 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
* Pigments.
*/
#include "dimension.h"
/* Allocate a dummy pigment */
dmnsn_pigment *
dmnsn_new_pigment(void)
{
dmnsn_pigment *pigment = dmnsn_malloc(sizeof(dmnsn_pigment));
pigment->pigment_fn = NULL;
pigment->initialize_fn = NULL;
pigment->free_fn = NULL;
pigment->trans = dmnsn_identity_matrix();
pigment->quick_color = dmnsn_black;
pigment->refcount = 1;
pigment->initialized = false;
return pigment;
}
/* Free a pigment */
void
dmnsn_delete_pigment(dmnsn_pigment *pigment)
{
if (DMNSN_DECREF(pigment)) {
if (pigment->free_fn) {
pigment->free_fn(pigment->ptr);
}
dmnsn_free(pigment);
}
}
/* Precompute pigment properties */
void
dmnsn_initialize_pigment(dmnsn_pigment *pigment)
{
dmnsn_assert(!pigment->initialized, "Pigment double-initialized.");
pigment->initialized = true;
if (pigment->initialize_fn) {
pigment->initialize_fn(pigment);
}
pigment->trans_inv = dmnsn_matrix_inverse(pigment->trans);
}
/* Evaluate a pigment */
dmnsn_color
dmnsn_evaluate_pigment(const dmnsn_pigment *pigment, dmnsn_vector v)
{
if (pigment->pigment_fn) {
dmnsn_vector v_trans = dmnsn_transform_vector(pigment->trans_inv, v);
return pigment->pigment_fn(pigment, v_trans);
} else {
return pigment->quick_color;
}
}
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