LÖVE

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	local w, h = love.graphics.getPixelDimensions()
	-- Calculate size of downscaled picture.
	-- Use ceil to round to the next larger number.
	-- This is necessary for the following reasons:
	--	- The upscaled canvas should not be larger than the window
	--	- The size of the large pixels should be an integer multiple of
	--		small pixels so that all large pixels end up the same size
	cw, ch =
		math.ceil(w/downscale),
		math.ceil(h/downscale)
	
	
	-- Create a canvas to draw the image to.
	canvas = love.graphics.newCanvas(
		cw, ch,
		-- Use MSAA if you want to get nice edges
		-- If you want the rough staircase use msaa = 0 instead.
		{msaa=4}
	)
	-- Set canvas filter to nearest so the image gets pixelated and not blurred
	canvas:setFilter("nearest", "nearest")

Code: Select all

	-- Set the canvas to draw to
	love.graphics.setCanvas(canvas)
	-- The canvas needs to be cleared explicitly
	love.graphics.clear(.5, .5, 1)
	
	-- [draw some stuff]
	
	-- Stop drawing to the canvas
	love.graphics.setCanvas()
	
	-- Color must be set to white while drawing canvas or else
	-- the whole image will be tinted.
	love.graphics.setColor(1,1,1)
	
	-- Draw the (magnified) canvas to the screen
	love.graphics.push()
	love.graphics.scale(downscale)
	love.graphics.draw(canvas)
	love.graphics.pop()