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1

I'd like to be able to make an empty PixelArray to compare with output from node-canvas from within JavaScript.

For example:

var cleanData = new PixelArray ( 20 );

Is this possible? Am I on the wrong version of Node.js? (0.8.3)

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Did it work when you tried it? – alex Nov 23 '12 at 4:33
    
No it is considered undefined (PixelArray) – Chris Bosco Nov 23 '12 at 4:35
    
I have also tried this approach using node-canvas, to the same result: var Canvas = require('canvas'); var PixelArray = Canvas.CanvasPixelArray; – Chris Bosco Nov 23 '12 at 4:36

1 Answer 1

up vote 1 down vote accepted

Uint8ClampedArray works.

var cleanData = new Uint8ClampedArray( width * height * 4 );

Some background:

http://www.khronos.org/registry/typedarray/specs/latest/#7.1  Uint8ClampedArray is defined in order to replace CanvasPixelArray. It behaves identically to the other typed array views, except that the setters and constructor use clamping [WEBIDL] rather than modulo arithmetic when converting incoming number values.

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