2 files changed, 22 insertions, 0 deletions
diff --git a/render.c b/render.c
index 9a504a0..07af8cf 100644
--- a/render.c
+++ b/render.c
@@ -114,3 +114,21 @@ void ren_map(
 	}
 }
 
+void ren_rect(
+	Renderer* r,
+	const struct Rect* re
+) {
+	Rect rect = *re;
+	int i, j;
+	int ex, ey;
+	rect_clipr(&rect, r->clip);
+	ex = rect.x + rect.w;
+	ey = rect.y + rect.h;
+	for (j = rect.y; j < ey; j++)
+		for (i = rect.x; i < ex; i++) {
+			int idx = i + j * r->w;
+			int bit = 1 << (idx & 0x1f);
+			r->t[idx >> 5] ^= bit;
+		}
+}
+
diff --git a/render.h b/render.h
index 98a8cc7..e41572e 100644
--- a/render.h
+++ b/render.h
@@ -27,5 +27,9 @@ void ren_map(
 	const struct Rect* re,
 	const Bitmap* bm
 );
+void ren_rect(
+	Renderer* r,
+	const struct Rect* re
+);
 
 #endif