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annotate src/core/sprite.c @ 112:40f22a8188d2

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image: set dimensions
author David Demelier <markand@malikania.fr>
date Sun, 12 Apr 2020 16:55:26 +0200
parents ed72843a7194
children
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1 /*
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2 * sprite.c -- image sprites
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3 *
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4 * Copyright (c) 2020 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <assert.h>
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20
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21 #include "sprite.h"
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22 #include "texture.h"
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23
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24 void
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25 sprite_init(struct sprite *sprite,
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26 struct texture *tex,
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27 unsigned int cellw,
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28 unsigned int cellh)
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29 {
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30 assert(sprite);
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31 assert(tex && texture_ok(tex));
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32
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33 sprite->texture = tex;
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34 sprite->cellw = cellw;
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35 sprite->cellh = cellh;
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36 sprite->nrows = tex->h / cellh;
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37 sprite->ncols = tex->w / cellw;
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38 }
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39
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40 void
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41 sprite_draw(struct sprite *sprite, unsigned int r, unsigned int c, int x, int y)
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42 {
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43 assert(sprite);
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44
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45 texture_scale(
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46 sprite->texture,
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47 c * sprite->cellw, /* src y */
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48 r * sprite->cellh, /* src x */
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49 sprite->cellw, /* src width */
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50 sprite->cellh, /* src height */
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51 x, /* dst x */
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52 y, /* dst y */
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53 sprite->cellw, /* dst width */
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54 sprite->cellh, /* dst height */
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55 0.0 /* angle */
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56 );
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57 }