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Re: [css-masking] 'mask' with resource and image references (was: [css4-images] support for SVG Paint Servers without element())

From: Dirk Schulze <dschulze@adobe.com>
Date: Tue, 6 Nov 2012 18:14:01 -0800
To: "robert@ocallahan.org" <robert@ocallahan.org>
CC: "Tab Atkins Jr." <jackalmage@gmail.com>, "www-style@w3.org list" <www-style@w3.org>
Message-ID: <B852460B-A99D-4A8E-9679-83281EA5EA62@adobe.com>

On Nov 6, 2012, at 5:06 PM, Robert O'Callahan <robert@ocallahan.org> wrote:

> On Wed, Nov 7, 2012 at 9:35 AM, Dirk Schulze <dschulze@adobe.com> wrote:
>> The current syntax for 'mask' is : <mask-source> | <mask-layer>#
>> So it depends on the values passed to the property, if the 'mask-image' logic is used (same as for 'background'), or if we use SVG masking.
> Just remove the <mask-source> alternative. "mask:url(foo.svg#abc)" gets parsed to a mask-image value of url(foo.svg#abc). When rendering, since the mask-image value is a url() with a fragment identifier, it should be treated as a reference to an SVG <mask>.

This is difficult because of multiple reasons:

<mask-source> does not only allow URLs, but also the 'child' keyword and the child selector.

The image on the 'mask-image' property gets clipped by the 'mask-clip' property, repeated by the 'mask-repeat' property and positioned by the 'mask-origin' property. All these properties do not apply on <mask> references.

A combination of images and mask references for the 'mask-image' property is not defined by the model for 'mask-image'. It is unclear how both can be combined and I actually don't think that this is a very good idea. Both 'mask-image' and <mask> have there use cases independent of each other.


> Rob
> -- 
> Jesus called them together and said, You know that the rulers of the Gentiles lord it over them, and their high officials exercise authority over them. Not so with you. Instead, whoever wants to become great among you must be your servant, and whoever wants to be first must be your slave  just as the Son of Man did not come to be served, but to serve, and to give his life as a ransom for many. [Matthew 20:25-28]
Received on Wednesday, 7 November 2012 02:14:27 UTC

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