Correct bias to the left.

Outputs/CRT/CRT.cpp

@@ -112,10 +112,19 @@ void CRT::set_dynamic_framing(
 	float minimum_scale
 ) {
 	framing_ = Framing::Dynamic;
-
 	framing_bounds_ = initial;
-	framing_bounds_.scale(0.95f / initial.size.width, 0.95f / initial.size.height);
-	framing_bounds_ = framing_bounds_ & Display::Rect(0.025f, 0.025f, 0.95f, 0.95f);
+
+	// As full constraints, pick at most 95% of the visible area, with the same centre.
+	const float centres[] = {
+		initial.origin.x + initial.size.width * 0.5f,
+		initial.origin.y + initial.size.height * 0.5f,
+	};
+	const float width = std::min(1.0f - centres[0], centres[0]) + max_centre_offset_x * 0.5f;
+	const float height = std::min(1.0f - centres[1], centres[1]) + max_centre_offset_y * 0.5f;
+	framing_bounds_ = Display::Rect(
+		centres[0] - width, centres[1] - height,
+		width * 2.0f, height * 2.0f
+	);
 
 	minimum_scale_ = minimum_scale;
 	max_offsets_[0] = max_centre_offset_x;

Outputs/CRT/Internals/RectAccumulator.hpp

@@ -105,11 +105,11 @@ private:
 	//
 	// Rects graduate to candidates only after exiting the stable filter, so the true number of
 	// frames considered at any given time is the product of the two sizes.
-	static constexpr int CandidateHistorySize = 120;
+	static constexpr int CandidateHistorySize = 12;
 	RectHistory<CandidateHistorySize> candidates_;
 
 	// At startup, look for a small number of sequential but consistent frames.
-	static constexpr int StableFilterSize = 4;
+	static constexpr int StableFilterSize = 10;
 	RectHistory<StableFilterSize> stable_filter_;
 	bool did_first_read_ = false;
 

Outputs/ScanTarget.hpp

@@ -48,8 +48,8 @@ struct Rect {
 			compare(size.height, rhs.size.height);
 	}
 
-	constexpr Rect() : origin({0.0f, 0.0f}), size({1.0f, 1.0f}) {}
-	constexpr Rect(float x, float y, float width, float height) :
+	constexpr Rect() noexcept : origin({0.0f, 0.0f}), size({1.0f, 1.0f}) {}
+	constexpr Rect(const float x, const float y, const float width, const float height) noexcept :
 		origin({x, y}), size({width, height}) {}
 
 	bool empty() const {