Bug 271045

Summary: [LBSE] SVG text on gradient not working
Product: WebKit Reporter: Pawel Lampe <plampe>
Component: WPE WebKitAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: bugs-noreply, rbuis, webkit-bug-importer, zimmermann
Priority: P2    
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Bug Depends on:    
Bug Blocks: 270845    
Attachments:
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Pawel Lampe
Reported 2024-03-15 02:20:19 PDT
Created attachment 470380 [details] screenshot The https://www.w3.org/Graphics/SVG/Test/20110816/harness/htmlObjectApproved/pservers-grad-08-b.html is currently not working correctly when LBSE is used on WPE port - see attached screenshot.
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2024-03-15 02:20 PDT, Pawel Lampe 		no flags
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Pawel Lampe
Comment 1 2024-03-15 02:23:17 PDT
Please note that the same problem is observed when I'm trying to implement the fillRect() fast path for Skia. Therefore I'm guessing LBSE is laying out things in wrong order, or doing some other things wrong.
Nikolas Zimmermann
Comment 2 2024-03-17 15:23:52 PDT
Thanks Pawel for filing the ticket. LBSE implements gradients on text without any temporary ImageBuffers, as opposed to the legacy SVG engine, but instead relying on compositing operations. That operation mode is untested on Cairo/Skia so far -- the legacy SVG engine doesn't exercise it. LBSE development mostly happens on macOS -- gradients work fine using CoreGraphics on macOS/iOS platform. We can have a chat and discuss this tomorrow -- I can suggest you a debugging strategy to approach this.
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