feat: add rasterization primitives

src/core/primitives.c

@@ -0,0 +1,47 @@
+#include "primitives.h"
+
+Polyline *mk_polyline(void) {
+  Polyline *pl = malloc(sizeof(Polyline));
+  pl->count = 0;
+  pl->capacity = 4;
+  pl->points = malloc(sizeof(V2) * pl->capacity);
+  return pl;
+}
+
+void add_point_polyline(Polyline *pl, V2 point) {
+  if (pl->count >= pl->capacity) {
+    pl->capacity *= 2;
+    pl->points = realloc(pl->points, sizeof(V2) * pl->capacity);
+  }
+  pl->points[pl->count++] = point;
+}
+
+void free_polyline(Polyline *pl) {
+  if (!pl)
+    return;
+  free(pl->points);
+  free(pl);
+}
+
+Polygon *mk_polygon(void) {
+  Polygon *pg = malloc(sizeof(Polygon));
+  pg->count = 0;
+  pg->capacity = 4;
+  pg->points = malloc(sizeof(V2) * pg->capacity);
+  return pg;
+}
+
+void add_point_polygon(Polygon *pg, V2 point) {
+  if (pg->count >= pg->capacity) {
+    pg->capacity *= 2;
+    pg->points = realloc(pg->points, sizeof(V2) * pg->capacity);
+  }
+  pg->points[pg->count++] = point;
+}
+
+void free_polygon(Polygon *pg) {
+  if (!pg)
+    return;
+  free(pg->points);
+  free(pg);
+}