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Posted to batik-dev@xmlgraphics.apache.org by "Helder Miguel Alves Magalhães (Jira)" <ji...@apache.org> on 2021/11/07 17:07:00 UTC
[jira] [Comment Edited] (BATIK-1317) Bug in gradient rendering
[ https://issues.apache.org/jira/browse/BATIK-1317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17440048#comment-17440048 ]
Helder Miguel Alves Magalhães edited comment on BATIK-1317 at 11/7/21, 5:06 PM:
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No sure if it's a compliance bug: rendering in a recent Firefox version closely resembles Batik behavior:
!Batik-1317-rendering_firefox.png!
Taking a look at the SVG source I'd say the "guilty" is "mix-blend-mode:overlay" +style+ property, which means that the implementation would have to implement +CSS 3+ (specifically [Compositing and Blending Level 1|https://drafts.fxtf.org/compositing-1/#mix-blend-mode]). Last time I checked, Batik implemented [{*}CSS 2.1{*}, the normative version for SVG 1.1|#ref-CSS2].
The alternative proposal is rework the file to use SVG filter properties, namely [feBlend|https://www.w3.org/TR/SVG11/filters.html#feBlendElement], which should allow achieving the same visual result {+}using SVG alone{+}.
Dropping the "Important" flag and lowering the (apparently) excessive priority given that a) there is now a reasonable workaround proposal and b) no rationale has been provided for requesting such high priority. If you need to increase again, please support you request with an explanation on the use case it's blocking, number of affected users, etc..
I'd suggest labeling this as "Support for CSS 3 Compositing and Blending module" and reworking to a "New Feature" request.
was (Author: helder):
No sure if it's a compliance bug: rendering in a recent Firefox version closely resembles Batik behavior:
!Batik-1317-rendering_firefox.png!
Taking a look at the SVG source I'd say the "guilty" is "mix-blend-mode:overlay" +style+ property, which means that the implementation would have to implement +CSS 3+ (specifically [Compositing and Blending Level 1|https://drafts.fxtf.org/compositing-1/#mix-blend-mode]). Last time I checked, Batik implemented [{*}CSS 2.1{*}, the normative version for SVG 1.1|#ref-CSS2].]
The alternative proposal is rework the file to use SVG filter properties, namely [feBlend|https://www.w3.org/TR/SVG11/filters.html#feBlendElement], which should allow achieving the same visual result {+}using SVG alone{+}.
Dropping the "Important" flag and lowering the (apparently) excessive priority given that a) there is now a reasonable workaround proposal and b) no rationale has been provided for requesting such high priority. If you need to increase again, please support you request with an explanation on the use case it's blocking, number of affected users, etc..
I'd suggest labeling this as "Support for CSS 3 Compositing and Blending module" and reworking to a "New Feature" request.
> Bug in gradient rendering
> -------------------------
>
> Key: BATIK-1317
> URL: https://issues.apache.org/jira/browse/BATIK-1317
> Project: Batik
> Issue Type: Bug
> Components: GVT
> Affects Versions: 1.14
> Reporter: Konstantin Bulenkov
> Priority: Minor
> Attachments: Batik-1317-rendering_firefox.png, icon_256.svg, image-2021-10-29-15-39-54-461.png, image-2021-10-29-15-40-25-145.png
>
>
> When using Batik for SVG rendering in Swing, we faced a problem with gradients. See example below
> Expected (Rendered in Chrome):
> !image-2021-10-29-15-40-25-145.png!
> Actual:
> !image-2021-10-29-15-39-54-461.png!
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