[whatwg] SVG extensions to <canvas>

[Vlad Alexander (xhtml.com)]

Anne, on a semi-related topic, can you please help me understand why Opera does not scale the SVG image when loaded via IMG element? Here is a test page:

http://xhtml.com/misc/svg-img.htm

Regards,
-Vlad
http://xhtml.com



-------- Original Message --------
From: Anne van Kesteren
Date: 2007-10-25 2:58 PM
> Hi,
> 
> (Please reply to either HTML or WHATWG list.)
> 
> 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.
> 
> Cheers,
> 
>