Define datatypes and functions for working with an image sequence

include/img_seq.h

@@ -0,0 +1,17 @@
+#ifndef IMG_SEQ_H
+#define IMG_SEQ_H
+
+#include "SDL_render.h"
+#include "aliases/aliases.h"
+
+typedef struct {
+  u64 pos;
+  u64 length;
+  SDL_Texture *frames[];
+} img_seq_t;
+
+img_seq_t *create_sequence(u64 frame_count);
+SDL_Texture *current_frame(img_seq_t *seq);
+void next_frame(img_seq_t *seq);
+
+#endif // !IMG_SEQ_H

src/img_seq.c

@@ -0,0 +1,17 @@
+#include "img_seq.h"
+#include "aliases/aliases.h"
+
+img_seq_t *create_sequence(u64 frame_count) {
+  return (img_seq_t *)malloc(
+      (sizeof(img_seq_t) + frame_count * sizeof(SDL_Texture *)));
+}
+
+SDL_Texture *current_frame(img_seq_t *seq) { return seq->frames[seq->pos]; }
+
+void next_frame(img_seq_t *seq) {
+  ++(seq->pos);
+
+  if (seq->pos >= seq->length) {
+    seq->pos = 0;
+  }
+}