[whatwg] SVG extensions to <canvas>
ian at hixie.ch
Thu Apr 30 12:15:04 PDT 2009
On Thu, 25 Oct 2007, Anne van Kesteren wrote:
> For Opera 9.5 beta we implemented some experimental extensions to
> <canvas> involving SVGSvgElement. SVGSvgElement is supported as "image"
> argument to both drawImage and createPattern. (An HTMLImageElement
> pointing to an SVG element is also supported, but that seems natural if
> you support SVG from <img>.)
> For drawImage the pixel size of the SVG is determined as follows:
> 1. The image size parameters passed to drawImage
> 2. The intrinsic size of the SVG image
> 3. 300 x 150
> For createPattern it is as follows:
> 1. The intrinsic size of the SVG image
> 2. 300 x 150
> (It would be nice if createPattern was extended to allow height/width
> arguments as well.)
> The intrinsic size of the SVG image is the specified size with
> percentages resolved against 300 x 150, and sizes depending on the
> font-size resolved against the computed font-size of the SVGSvgElement
> (will be the browser default most of the time).
> The SVG image is always rendered at time 0 for animated images.
> Drawing an SVG image currently marks the canvas context as unsafe so
> toDataURL() and getImageData() throw. We expect to make this story a bit
> nicer at some point.
As far as I can tell this doesn't require any changes to HTML5, since the
same applies here as applies to a regular <img>, right?
Ian Hickson U+1047E )\._.,--....,'``. fL
http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,.
Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
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