Add support for inline style `opacity`

[ryanholden8]

Hi Glenn,

Just discovered this project, awesome work! Thank you! I'm trying to render SVGs outputted from Adobe Illustrator with inline styles and they are rendering accurately (and really fast) but it looks like Illustrator is using the opacity style for their inline styles and not fill-opacity.

Relevant output of Illustrator: <path d="M1348 1414c-7 12-20 4-30 5-12 2-19 9-32 7-8-1-12-3-20-1-6 1-12 4-18 4-14 0-24-15-37-12 5-17 14-62-9-70-8-2-27 7-35 7-12 1-21-1-31-8-4-2-17-15-21-9s7 17 11 21c19 16 48 11 70 5-2 8-1 17-2 25-14-22-39-3-42 17-2 18 13 40 32 28-7 19 23 11 31 12 15 2 21 9 37 6 13-4 19-3 32-1s20-3 33-6c9-2 17 3 27 1s23-11 25-21c3-12-13-22-21-10l3-5-3 5z" style="fill:#565656;opacity:.5"/>

Here is the modification to support it. :)

SVG 1.1 Spec: https://www.w3.org/TR/SVG/masking.html#OpacityProperty More Info: http://stackoverflow.com/questions/37759898/opacity-vs-fill-opacity-in-svg

[grhowes]

Hi Ryan, I think this is more spec compliant. https://github.com/GenerallyHelpfulSoftware/SVGgh/pull/27

[grhowes]

Ryan, could you send me an SVG to test?