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Simple validation for render method #137

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3 changes: 3 additions & 0 deletions src/gif.coffee
Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,8 @@ class GIF extends EventEmitter
@frames.push frame

render: ->
throw new Error 'Frames must be added prior to rendering' if @frames.length == 0

throw new Error 'Already running' if @running

if not @options.width? or not @options.height?
Expand Down Expand Up @@ -147,6 +149,7 @@ class GIF extends EventEmitter
type: 'image/gif'

@emit 'finished', image, data
@running = false

renderNextFrame: ->
throw new Error 'No free workers' if @freeWorkers.length is 0
Expand Down