From 259237fae792e8f19d9b7920b2354f75bc1789e2 Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Mon, 23 Sep 2024 21:11:29 +1000
Subject: initial commit, basic platform and rendering code.

---
 rect.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 rect.c

(limited to 'rect.c')

diff --git a/rect.c b/rect.c
new file mode 100644
index 0000000..69758c1
--- /dev/null
+++ b/rect.c
@@ -0,0 +1,85 @@
+#include "rect.h"
+
+Rect* rect_clip(Rect* r, const Rect* c) {
+	int n;
+	if ((n = c->x - r->x) > 0) {
+		r->w -= n;
+		r->x += n;
+	}
+	if ((n = c->y - r->y) > 0) {
+		r->h -= n;
+		r->y += n;
+	}
+	if ((n = r->x + r->w - (c->x + c->w)) > 0)
+		r->w -= n;
+	if ((n = r->y + r->h - (c->y + c->h)) > 0)
+		r->h -= n;
+	return r;
+}
+
+Rect* rect_clipr(Rect* r, const int* c) {
+	int n;
+	if ((n = c[0] - r->x) > 0) {
+		r->w -= n;
+		r->x += n;
+	}
+	if ((n = c[1] - r->y) > 0) {
+		r->h -= n;
+		r->y += n;
+	}
+	if ((n = r->x + r->w - c[2]) > 0)
+		r->w -= n;
+	if ((n = r->y + r->h - c[3]) > 0)
+		r->h -= n;
+	return r;
+}
+
+Rect* rect_clips(Rect* r, Rect* s, const Rect* c) {
+	int n;
+	if ((n = c->x - r->x) > 0) {
+		r->w -= n;
+		r->x += n;
+		s->w -= n;
+		s->x += n;
+	}
+	if ((n = c->y - r->y) > 0) {
+		r->h -= n;
+		r->y += n;
+		s->h -= n;
+		s->y += n;
+	}
+	if ((n = r->x + r->w - (c->x + c->w)) > 0) {
+		r->w -= n;
+		s->w -= n;
+	}
+	if ((n = r->y + r->h - (c->y + c->h)) > 0) {
+		r->h -= n;
+		s->h -= n;
+	}
+	return r;
+}
+
+Rect* rect_clipsr(Rect* r, Rect* s, const int* c) {
+	int n;
+	if ((n = c[0] - r->x) > 0) {
+		r->w -= n;
+		r->x += n;
+		s->w -= n;
+		s->x += n;
+	}
+	if ((n = c[1] - r->y) > 0) {
+		r->h -= n;
+		r->y += n;
+		s->h -= n;
+		s->y += n;
+	}
+	if ((n = r->x + r->w - c[2]) > 0) {
+		r->w -= n;
+		s->w -= n;
+	}
+	if ((n = r->y + r->h - c[3]) > 0) {
+		r->h -= n;
+		s->h -= n;
+	}
+	return r;
+}
-- 
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