[BUG] SVG images are not inserted correctly

[njkleiner]

Description

Some kinds of SVG images cannot be drawn on a PDF page using creator.NewGraphicSVGFromFile.

Expected Behavior

The SVG image should be drawn on the page.

If the SVG image cannot be drawn for whatever reason (e.g., the particular structure used within the SVG file is not supported), calling creator.NewGraphicSVGFromFile should at least return an error instead of panicking.

Actual Behavior

We can observe the following two outcomes (depending on the SVG image input file):

• creator.NewGraphicSVGFromFile does not return an error, but the image is not drawn on the page.
• creator.NewGraphicSVGFromFile panics.

See the pflege-de/unipdf-issue-insert-svg repository for a full proof-of-concept program that can be used to reproduce the issue, including various example SVG files.

See the README of the repository for more information, including concrete reproduction steps.

[github-actions]

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[anovik]

@njkleiner Thanks for your test repo and data you've provided, that was very helpful to us.

We've done several enhancements related to SVG and they will be included into UniPDF release later this month, we will notify you when it will be available.

The enhancements include fixes for both panics you've found and processing of 'transform' attribute. For 2 files from your test set there is still a problem with displaying related to 'defs' attribute but this is already included into our roadmap for next releases.

[anovik]

@njkleiner The new UniPDF release is out https://github.com/unidoc/unipdf/releases/tag/v3.64.0 could you please test SVG improvements?

Thanks for your cooperation.