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/*************************************************************************
* Copyright (C) 2010-2014 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
* Image maps.
*/
#include "dimension.h"
/** Canvas pigment type. */
typedef struct dmnsn_canvas_pigment {
dmnsn_pigment pigment;
dmnsn_canvas *canvas;
} dmnsn_canvas_pigment;
/** Canvas pigment color callback. */
static dmnsn_tcolor
dmnsn_canvas_pigment_fn(const dmnsn_pigment *pigment, dmnsn_vector v)
{
const dmnsn_canvas_pigment *canvas_pigment =
(const dmnsn_canvas_pigment *)pigment;
dmnsn_canvas *canvas = canvas_pigment->canvas;
size_t x = llround((fmod(v.x, 1.0) + 1.0)*(canvas->width - 1));
size_t y = llround((fmod(v.y, 1.0) + 1.0)*(canvas->height - 1));
return dmnsn_canvas_get_pixel(canvas, x%canvas->width, y%canvas->height);
}
/** Canvas pigment destructor. */
static void
dmnsn_canvas_pigment_free_fn(dmnsn_pigment *pigment)
{
dmnsn_canvas_pigment *canvas_pigment = (dmnsn_canvas_pigment *)pigment;
dmnsn_free(canvas_pigment);
}
/* Create a canvas color */
dmnsn_pigment *
dmnsn_new_canvas_pigment(dmnsn_canvas *canvas)
{
dmnsn_canvas_pigment *canvas_pigment = DMNSN_MALLOC(dmnsn_canvas_pigment);
canvas_pigment->canvas = canvas;
dmnsn_pigment *pigment = &canvas_pigment->pigment;
dmnsn_init_pigment(pigment);
pigment->pigment_fn = dmnsn_canvas_pigment_fn;
pigment->free_fn = dmnsn_canvas_pigment_free_fn;
return pigment;
}
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