feat: Simplify aspect fraction

1 files changed, 15 insertions, 0 deletions

diff --git a/src/LEDVideoWall.cpp b/src/LEDVideoWall.cpp
index e235aa2..5fb69ac 100644
--- a/src/LEDVideoWall.cpp
+++ b/src/LEDVideoWall.cpp
@@ -14,7 +14,22 @@ LEDVideoWall* LEDVideoWall::Freeform(mm panel_width, mm panel_height, mm wall_ma
 		rows);
 }
 
+#define CMP_EPSILON 0.0000001
+
+// GCD is available in stl from C++17 onwards, but I'm still reimplementing it
+unsigned int gcd(unsigned int a, unsigned int b) {
+	if (a == b) return a;
+	if (a < b) return gcd(b, a);
+	return gcd(a - b, b);
+}
+
 LEDVideoWall* LEDVideoWall::Aspect(mm panel_width, mm panel_height, unsigned int aspect_width, unsigned int aspect_height) {
+	// Simplify the fraction (aspect), because we want the smallest screen size
+	// For example, turn 16:10 into 8:5
+	unsigned int aspect_gcd = gcd(aspect_width, aspect_height);
+	aspect_width /= aspect_gcd;
+	aspect_height /= aspect_gcd;
+
 	return new LEDVideoWall(
 			aspect_width * panel_width,
 			aspect_height * panel_height,