[WinCairo] Use Cairo DirectWrite font backend

• Component: Platform
• Status: RESOLVED FIXED

[Fujii Hironori]

[WinCairo] Use Cairo DirectWrite font backend

Mozilla has Cairo DirectWrite patch. Let's try it.

[Fujii Hironori]

Created attachment 406156 [details]
WIP patch

[Fujii Hironori]

Created attachment 406157 [details]
Patch for Cairo 1.16

[Fujii Hironori]

No color glyphs are rendered with this patch.

According to the following document, I should use IDWriteFactory4::TranslateColorGlyphRun.

Color Fonts - Win32 apps | Microsoft Docs
https://docs.microsoft.com/en-us/windows/win32/directwrite/color-fonts

IDWriteFactory4::TranslateColorGlyphRun (dwrite_3.h) - Win32 apps | Microsoft Docs
https://docs.microsoft.com/en-us/windows/win32/api/dwrite_3/nf-dwrite_3-idwritefactory4-translatecolorglyphrun

[Fujii Hironori]

Created attachment 406764 [details]
Patch for Cairo 1.16

[Fujii Hironori]

Created attachment 406765 [details]
WIP patch

[Fujii Hironori]

Graphic bits » Blog Archive » DirectWrite Text Rendering in Firefox 6
https://web.archive.org/web/20160909065035/https://blog.mozilla.org/nattokirai/2011/08/11/directwrite-text-rendering-in-firefox-6/

[Fujii Hironori]

Created attachment 407628 [details]
WIP patch

[Fujii Hironori]

I found some minor issues.

Because WinCairo is using Uniscribe for shaping, I need to use
DirectWrite GDI compatible mode at the moment. Unfortunately,
DirectWrite GDI compatible mode looks jaggier than GDI. Even
though GDI is rendering text with subpixel antialiasing both
vertically and horizontally, DirectWrite GDI compatible mode
seems to do it only horizontally.

Uniscribe doesn't combine some emoji sequences.
https://getemoji.com/

Both issues are related to Uniscribe. WinCairo should use
DirectWrite or HarfBuzz DirectWrite backend for shaping.

[Fujii Hironori]

Screenshots: https://ibb.co/album/dsHY4

[Fujii Hironori]

Oh, wrong URL!

Screenshots: https://ibb.co/album/dsHY4y

[Fujii Hironori]

Cairo 1.17.6 added DWrite support.
https://lists.cairographics.org/archives/cairo/2022-March/029398.html

[Fujii Hironori]

Created attachment 457016 [details]
WIP patch

[Fujii Hironori]

Some ref tests failures.

  css2.1/20110323/text-indent-intrinsic-001.htm [ ImageOnlyFailure ]
  css2.1/20110323/text-indent-intrinsic-002.htm [ ImageOnlyFailure ]
  css2.1/20110323/text-indent-intrinsic-003.htm [ ImageOnlyFailure ]
  css2.1/20110323/text-indent-intrinsic-004.htm [ ImageOnlyFailure ]
  css3/bdi-element.html [ ImageOnlyFailure ]
  css3/flexbox/csswg/ttwf-reftest-flex-wrap-reverse.html [ ImageOnlyFailure ]
  css3/flexbox/csswg/ttwf-reftest-flex-wrap.html [ ImageOnlyFailure ]
  fast/css/absolute-inline-alignment-2.html [ ImageOnlyFailure ]
  fast/css/absolute-inline-alignment.html [ ImageOnlyFailure ]
  fast/css/negative-text-indent-in-inline-block.html [ ImageOnlyFailure ]
  fast/text/arabic-zwj-and-zwnj.html [ ImageOnlyFailure ]
  fast/text/complex-initial-advance.html [ ImageOnlyFailure ]
  fast/text/default-ignorable.html [ ImageOnlyFailure ]
  fast/text/embed-at-end-of-pre-wrap-line-simple-lines.html [ ImageOnlyFailure ]
  fast/text/fitzpatrick-combination.html [ ImageOnlyFailure ]
  fast/text/isolate-ignore.html [ ImageOnlyFailure ]
  fast/text/ja-sans-serif.html [ ImageOnlyFailure ]
  fast/text/otsvg-spacing.html [ ImageOnlyFailure ]
  fast/text/simple-line-layout-leading-whitespace-with-soft-hard-linebreak.html [ ImageOnlyFailure ]
  fast/text/soft-hyphen-min-preferred-width.html [ ImageOnlyFailure ]
  fast/text/softHyphen.html [ ImageOnlyFailure ]
  fast/text/text-combine-rendering.html [ ImageOnlyFailure ]
  fast/text/text-underline-first-line-decoration.html [ ImageOnlyFailure ]
  fast/text/text-underline-position-under.html [ ImageOnlyFailure ]
  fast/text/undefined-glyph-with-ligature.html [ ImageOnlyFailure ]

[Fujii Hironori]

Created attachment 459487 [details]
WIP patch

[Fujii Hironori]

Created attachment 459562 [details]
small-font-test.html

[Fujii Hironori]

DWrite: Outermost edges of embedded bitmap font glyphs aren't drawn (#569) · Issues · cairo / cairo · GitLab
https://gitlab.freedesktop.org/cairo/cairo/-/issues/569

[Fujii Hironori]

DWrite: It looks jaggy (#567) · Issues · cairo / cairo · GitLab
https://gitlab.freedesktop.org/cairo/cairo/-/issues/567

[Fujii Hironori]

Created attachment 464549 [details]
WIP patch

[Fujii Hironori]

Created attachment 464937 [details]
WIP patch

[Fujii Hironori]

Created attachment 465156 [details]
WIP patch

[Fujii Hironori]

Created attachment 465605 [details]
WIP patch

[Fujii Hironori]

Created attachment 465690 [details]
WIP patch

[Fujii Hironori]

Created attachment 466056 [details]
WIP patch

[Fujii Hironori]

Pull request: https://github.com/WebKit/WebKit/pull/18985

[EWS]

Committed 269270@main (0f066948ca64): <https://commits.webkit.org/269270@main>

Reviewed commits have been landed. Closing PR #18985 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/116878771>

[Fujii Hironori]

Re-opening for pull request https://github.com/WebKit/WebKit/pull/19018

[EWS]

Committed 269275@main (6d7089f0d592): <https://commits.webkit.org/269275@main>

Reviewed commits have been landed. Closing PR #19018 and removing active labels.