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Optimize tempCanvas resizing #49

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Optimize tempCanvas resizing #49

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13 changes: 10 additions & 3 deletions lib/util.lua
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Original file line number Diff line number Diff line change
@@ -1,12 +1,19 @@
local util = {}
local tempCanvas
local lastCanvasWidth, lastCanvasHeight

--TODO: the whole stencil/canvas system should be reviewed since it has been changed in a naive way

function util.process(canvas, options)
--TODO: now you cannot draw a canvas to itself
if not tempCanvas then
tempCanvas = love.graphics.newCanvas()

local canvasWidth, canvasHeight = love.graphics.getDimensions()

-- If canvas size has changed, recreate tempCanvas
if not tempCanvas or canvasWidth ~= lastCanvasWidth or canvasHeight ~= lastCanvasHeight then
tempCanvas = love.graphics.newCanvas(canvasWidth, canvasHeight)
lastCanvasWidth, lastCanvasHeight = canvasWidth, canvasHeight
end

util.drawCanvasToCanvas(canvas, tempCanvas, options)
util.drawCanvasToCanvas(tempCanvas, canvas, options)
end
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