--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libmlk-core/mlk/core/sprite.c	Sat Oct 15 20:23:14 2022 +0200
@@ -0,0 +1,77 @@
+/*
+ * sprite.c -- image sprites
+ *
+ * Copyright (c) 2020-2022 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 "sprite.h"
+#include "texture.h"
+
+void
+sprite_init(struct sprite *sprite,
+            struct texture *tex,
+            unsigned int cellw,
+            unsigned int cellh)
+{
+	assert(sprite);
+	assert(tex && texture_ok(tex));
+
+	sprite->texture = tex;
+	sprite->cellw = cellw;
+	sprite->cellh = cellh;
+	sprite->nrows = tex->h / cellh;
+	sprite->ncols = tex->w / cellw;
+}
+
+int
+sprite_ok(const struct sprite *sprite)
+{
+	return sprite && texture_ok(sprite->texture) && sprite->cellw != 0 && sprite->cellh != 0;
+}
+
+int
+sprite_draw(const struct sprite *sprite, unsigned int r, unsigned int c, int x, int y)
+{
+	return sprite_scale(sprite, r, c, x, y, sprite->cellw, sprite->cellh);
+}
+
+int
+sprite_scale(const struct sprite *sprite,
+	     unsigned int r,
+	     unsigned int c,
+	     int x,
+	     int y,
+	     unsigned int w,
+	     unsigned int h)
+{
+	assert(sprite_ok(sprite));
+	assert(r < sprite->nrows);
+	assert(c < sprite->ncols);
+
+	return texture_scale(
+		sprite->texture,
+		c * sprite->cellw,      /* src y */
+		r * sprite->cellh,      /* src x */
+		sprite->cellw,          /* src width */
+		sprite->cellh,          /* src height */
+		x,                      /* dst x */
+		y,                      /* dst y */
+		w,                      /* dst width */
+		h,                      /* dst height */
+		0.0                     /* angle */
+	);
+}