--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/libmlk-core/core/animation.c	Fri Oct 01 20:30:00 2021 +0200
@@ -0,0 +1,120 @@
+/*
+ * animation.c -- basic animations
+ *
+ * Copyright (c) 2020-2021 David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include "drawable.h"
+#include "animation.h"
+#include "sprite.h"
+
+static int
+update(struct drawable *dw, unsigned int ticks)
+{
+	return animation_update(dw->data, ticks);
+}
+
+static void
+draw(struct drawable *dw)
+{
+	animation_draw(dw->data, dw->x, dw->y);
+}
+
+void
+animation_init(struct animation *an, const struct sprite *sprite, unsigned int delay)
+{
+	assert(an);
+	assert(sprite);
+
+	an->sprite = sprite;
+	an->row = 0;
+	an->column = 0;
+	an->delay = delay;
+	an->elapsed = 0;
+}
+
+void
+animation_start(struct animation *an)
+{
+	assert(an);
+
+	an->row = 0;
+	an->column = 0;
+	an->elapsed = 0;
+}
+
+int
+animation_completed(const struct animation *an)
+{
+	assert(an);
+
+	return an->elapsed >= an->delay &&
+	       an->row >= an->sprite->nrows &&
+	       an->column >= an->sprite->ncols;
+}
+
+int
+animation_update(struct animation *an, unsigned int ticks)
+{
+	assert(an);
+
+	an->elapsed += ticks;
+
+	if (an->elapsed < an->delay)
+		return 0;
+
+	/* Increment column first */
+	if (++an->column >= an->sprite->ncols) {
+		/*
+		 * Increment row, if we reach the last row it means we are
+		 * at the last frame.
+		 */
+		if (++an->row >= an->sprite->nrows)
+			an->row = an->sprite->nrows;
+		else
+			an->column = an->elapsed = 0;
+	} else
+		an->elapsed = 0;
+
+	return animation_completed(an);
+}
+
+int
+animation_draw(const struct animation *an, int x, int y)
+{
+	assert(an);
+
+	return sprite_draw(an->sprite, an->row, an->column, x, y);
+}
+
+void
+animation_drawable(struct animation *an, struct drawable *dw, int x, int y)
+{
+	assert(an);
+	assert(dw);
+
+	memset(dw, 0, sizeof (*dw));
+	
+	dw->data = an;
+	dw->x = x - (an->sprite->cellw / 2);
+	dw->y = y - (an->sprite->cellh / 2);
+	dw->update = update;
+	dw->draw = draw;
+
+	animation_start(an);
+}