http://blog.mozilla.com/bcrowder/2009/04/08/canvas-chrome-content/ what I'm doing, what I'm interested in, random junk Tue, 22 Feb 2011 00:39:28 +0000 hourly 1 http://wordpress.org/?v=3.2.1 http://blog.mozilla.com/bcrowder/2009/04/08/canvas-chrome-content/comment-page-1/#comment-226 Boris Thu, 09 Apr 2009 13:54:43 +0000 http://blog.mozilla.com/bcrowder/?p=28#comment-226 As I mentioned to Brian yesterday, createImageData()'s filling in the array has the nice property that you can fill you image data in any order without a performance penalty. If you use your own object and don't pre-initialize the array yourself, then you run into serious performance issues in SpiderMonkey if you fill it in any order but row order (so fill in the first row starting on the left, then the second row, etc), due to the array becoming sparse. In particular, if your data is best filled in a column at a time, that approach will really hurt. As I mentioned to Brian yesterday, createImageData()’s filling in the array has the nice property that you can fill you image data in any order without a performance penalty. If you use your own object and don’t pre-initialize the array yourself, then you run into serious performance issues in SpiderMonkey if you fill it in any order but row order (so fill in the first row starting on the left, then the second row, etc), due to the array becoming sparse. In particular, if your data is best filled in a column at a time, that approach will really hurt.

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