[whatwg] getImageData/putImageData comments

[Boris Zbarsky]

Ian Hickson wrote:
> On Mon, 1 Jun 2009, Boris Zbarsky wrote:
>> I still think that we need a better "I have some externally-derived 
>> pixel data I'd like to just stick in this canvas" API here.  fillRect() 
>> has terrible performance characteristics (as has been brought up many 
>> times before), and the current imagedata design makes it very difficult 
>> to use it correctly for this purpose...
> 
> It's not that hard, it's an extra four or five lines of code to fill in 
> multiple pixels in a square (two nested for-loops and an expression or two 
> to work out what the limit is). Compared to the maths such code would be 
> doing anyway, this is trivial stuff.

The hard part is realizing you have to do it...

-Boris