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Re: [filter-effects] feImage with missing image resource

From: Max Vujovic <mvujovic@adobe.com>
Date: Mon, 3 Nov 2014 21:36:19 +0000
To: Dirk Schulze <dschulze@adobe.com>
CC: FX <public-fx@w3.org>
Message-ID: <82AD098B-B63F-4218-9CDD-470634F05BEA@adobe.com>
On Nov 3, 2014, at 6:14 AM, Dirk Schulze <dschulze@adobe.com> wrote:

> 1) treat <feImage> as a transparent black image taking all primitive regions into account,
> 2) replace the missing image with a “missing image” icon and take all primitive regions into account or
> 3) treat <feImage> and all successor color manipulating primitives as null filter.
> 
> Example: https://www.w3.org/Bugs/Public/attachment.cgi?id=1531
> Description: https://www.w3.org/Bugs/Public/show_bug.cgi?id=27221#c0
> 
> Option 1) looks reasonable for me and is easy to implement/specify. Option 2) looks strange but at least gives authors feedback of what is going on. I am unsure how to specify 3) and how it actually is implemented. Maybe someone from Mozilla could clarify.

I debugged Firefox a bit, and it looks like an feImage with a missing resource becomes a transparent black feFlood filter node with a result size of 0x0. I suppose the result size of 0x0 is why successive primitives that manipulate color appear not to do anything. 

It seems relatively straightforward to change it to option #1 if desired.

- Max
Received on Monday, 3 November 2014 21:36:49 UTC

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