Implement no_std compatible ab_glyph glyph rendering backend #185
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@jackpot51 Seems "BSD-3-Clause" used by tiny-skia and "BSD-2-Clause" used by arrayref are There is not much no_std resizing library on crates.io though. |
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@EHfive the deny.toml does not explicitely disallow those licenses, they just aren't explicitely allowed. You can add them to the allow list. |
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Separated the first commit into #189 for easier discussion. And I decided to use resize for resizing glyph images as tiny-skia appears to have poor quality on image down-sampling, see https://github.com/RazrFalcon/tiny-skia#notable-changes . The crate resize is not no_std but there is a PR going away to make it no_std, PistonDevelopers/resize#35 . Also marked this as draft to avoid creating noises in your message boxes. |
The trait contains only one method, draw_line, which is going to be implemented by glyph rendering backend like swash to scale & rasterize inputed glyphs and draw pixels of them. This make it easier to implement other rendering backend, and allows switching rendering backend at runtime. The original code of glyph rendering for swash is moved into Draw. And add draw_with method to Buffer and Edit interfaces to draw with glyph rendering backend that implemented Draw trait. The original glyph drawing part using swash in buffer and editor is also migrated to using Draw.
This uses ab_glyph to scale & rasterize glyph outline and load glyph image, it can be served as an alternative to swash. For glyph image(e.g. color emoji) rendering, only support for images in PNG format are currently implemented due to upstream limitation.
Note
This PR depends on #183 and #184 . Please review & merge those first.Merged or have alternative #188 .Implement no_std compatible ab_glyph glyph rendering backend
This uses ab_glyph to scale & rasterize glyph outline and load glyph image, it
can be served as an alternative to swash.
For glyph image(e.g. color emoji) rendering, only support for images in PNG
format are currently implemented due to upstream limitation.
Screenshot of demo targeting no_std x86_64-unknown-uefi
Add ab_glyph feature to examples and use the new draw_with method
Run examples with
cargo run --features ab_glyphto test ab_glyph rendering.