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diff --git a/70/index.md b/70/index.md new file mode 100644 index 0000000..9b19a1b --- /dev/null +++ b/70/index.md @@ -0,0 +1,51 @@ +Title: Add support for SVG images +Author: rodarima +Created: Fri, 02 Feb 2024 22:30:44 +0000 +State: closed + +Add support for SVG images, as they are becoming more frequent in the web. + +We probably should link or embed a SVG library that performs the rastering, but make it optional so it can be disabled on build time. + +Some options from #53 : + +- https://git.netsurf-browser.org/libsvgtiny.git/tree/README +- https://github.com/fltk/nanosvg (already in FLTK) +- https://github.com/RazrFalcon/resvg + +In other to test that it works fine, we could have a reference page with a image already rendered to PNG or a similar format, and compare the result with the new library rendering the same SVG image. + +--%-- +From: rodarima +Date: Sun, 12 May 2024 20:49:09 +0000 + +One of the main good uses of SVG images is to read Wikipedia equations, which are included as a fallback for non-JS browsers. The equations are all rendered with MathJax, which defines all the glyphs using `<defs>` and then places each glyph in the proper position using the `<use>` tag. + +This is problematic, as both libsvgtiny and nanosvg lack support for them and cannot render Wikipedia equations. I tested librsvg and renders properly those equations, but is by far a very large and complex library: + + + + + + + + +(We also need to avoid rendering the MathML parts of the Wikipedia) + +Ideally we should either implement support for defs/use or find another less complicated library that implements it. The size of librsvg is a wopping 3MiB, without dependencies. + +--%-- +From: rodarima +Date: Sat, 06 Jul 2024 12:33:13 +0000 + +Nanosvg doesn't support text or tspan tags either. + +--%-- +From: rodarima +Date: Sat, 27 Jul 2024 11:17:50 +0000 + +Basic support for SVG added in https://github.com/dillo-browser/dillo/pull/211 + +This is enough to render Wikipedia equations, but it lacks a lot of other SVG features that should be handled by a more elaborate SVG library. The benefit of using nanosvg is that it is builtin into Dillo without dependencies. + +In the future we may want to add an support for other libraries, so that they can be enabled at configure time.
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