libcamera: geometry: Provide in-place versions of the Size helpers

Add alignDownTo(), alignUpTo(), boundTo() and expandTo() helper
functions to the Size class. These are in-place versions of the existing
alignedDownTo(), alignedUpTo(), boundedTo() and expandedTo() functions.

The new helpers return a reference to the size, to allow chaining the
functions. One can thus write

	size.alignDownTo(16, 16).alignUpTo(32, 32)
	    .boundTo({ 40, 80 }).expandTo({ 16, 80 });

instead of

	size.alignDownTo(16, 16);
	size.alignUpTo(32, 32);
	size.boundTo({ 40, 80 });
	size.expandTo({ 16, 80 });

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

include/libcamera/geometry.h

@@ -32,6 +32,34 @@ public:
 	bool isNull() const { return !width && !height; }
 	const std::string toString() const;
 
+	Size &alignDownTo(unsigned int hAlignment, unsigned int vAlignment)
+	{
+		width = width / hAlignment * hAlignment;
+		height = height / vAlignment * vAlignment;
+		return *this;
+	}
+
+	Size &alignUpTo(unsigned int hAlignment, unsigned int vAlignment)
+	{
+		width = (width + hAlignment - 1) / hAlignment * hAlignment;
+		height = (height + vAlignment - 1) / vAlignment * vAlignment;
+		return *this;
+	}
+
+	Size &boundTo(const Size &bound)
+	{
+		width = std::min(width, bound.width);
+		height = std::min(height, bound.height);
+		return *this;
+	}
+
+	Size &expandTo(const Size &expand)
+	{
+		width = std::max(width, expand.width);
+		height = std::max(height, expand.height);
+		return *this;
+	}
+
 	constexpr Size alignedDownTo(unsigned int hAlignment,
 				     unsigned int vAlignment) const
 	{