By harnessing the power of center.lua, I have mastered the art of throwing a canvas of a given size onto the screen and scaling it up to fill the available space. That's really all this does. Calling it a tiny wrapper around Center wouldn't be terribly inaccurate.

Throw center.lua and pixelscale.lua into the root of your Love project, and set up pixelscale like such:

local pscale = require "pixelscale"
pscale:setupCanvas(640, 480)
function love.draw()
	pscale:start()
		-- draw to the canvas here
	pscale:finish()
	pscale:draw() -- draw the canvas centered to the screen
end
function love.resize(width, height)
	pscale:resize(width, height)
end

Initializes pixelscale by creating a canvas of the specified size, and passing the size to Center.

Releases the existing canvas and creates a new one of the given size, and then alters Center's configured size to match.

Sets the canvas as the draw target, and automatically clears it to transparent black.

Sets the draw target back to the previous canvas.

Draws the canvas to the screen, centered using Center, using premultiplied alpha (just in case), and passing the given arguments to love.graphics.draw.

Calls center:resize(width, height) for ease of use.

Returns center:toGame(x,y) for ease of use.