I'd like to propose adding an imageRenderingQuality property on the canvas 2D context to allow authors to choose speed vs. quality when rendering images (especially transformed ones). This is modeled on the SVG image-rendering property, at http://www.w3.org/TR/SVG/painting.html#ImageRenderingProperty :


  attribute string imageRenderingQuality;

'auto' (default): The user agent shall make appropriate tradeoffs to balance speed and quality, but quality shall be given more importance than speed.

'optimizeQuality': Emphasize quality over rendering speed.

'optimizeSpeed': Emphasize speed over rendering quality.

No specific image sampling algorithm is specified for any of these properties, with the exception that, at a minimum, nearest-neighbour resampling should be used. One alternative is to specify 'best', 'good', 'fast', with "good" being the default, as opposed to the SVG names; I think those names are more descriptive, but there might be value in keeping the names consistent with SVG, especially if that property bubbles up into general CSS usage.

    - Vlad

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