[tor-commits] [tor-browser] 30/76: Bug 41043: Hardcode the UI font on Linux

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richard pushed a commit to branch tor-browser-102.3.0esr-12.0-1
in repository tor-browser.

commit ba8ac215e8271853e2fc11fd32452fb82d007150
Author: Pier Angelo Vendrame <pierov@xxxxxxxxxxxxxx>
AuthorDate: Wed Jul 6 22:06:01 2022 +0200

    Bug 41043: Hardcode the UI font on Linux
    
    The mechanism to choose the UI font does not play well with our
    fontconfig configuration. As a result, the final criterion to choose
    the font for the UI was its version.
    
    Since we hardcode Arimo as a default sans-serif on preferences, we use
    it also for the UI. FontConfig will fall back to some other font for
    scripts Arimo does not cover as expected (we tested with Japanese).
---
 gfx/thebes/gfxFcPlatformFontList.cpp | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/gfx/thebes/gfxFcPlatformFontList.cpp b/gfx/thebes/gfxFcPlatformFontList.cpp
index ddd230be7e46..69286ae6dbe4 100644
--- a/gfx/thebes/gfxFcPlatformFontList.cpp
+++ b/gfx/thebes/gfxFcPlatformFontList.cpp
@@ -2033,10 +2033,12 @@ void gfxFcPlatformFontList::GetFontList(nsAtom* aLangGroup,
 FontFamily gfxFcPlatformFontList::GetDefaultFontForPlatform(
     nsPresContext* aPresContext, const gfxFontStyle* aStyle,
     nsAtom* aLanguage) {
-  // Get the default font by using a fake name to retrieve the first
-  // scalable font that fontconfig suggests for the given language.
+  // We hardcode Arimo also in preferences, and using the original code that
+  // tried to resolve a non-existing font did not play well with our fontconfig
+  // configuration. See
+  // https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/41043
   PrefFontList* prefFonts =
-      FindGenericFamilies(aPresContext, "-moz-default"_ns,
+      FindGenericFamilies(aPresContext, "Arimo"_ns,
                           aLanguage ? aLanguage : nsGkAtoms::x_western);
   NS_ASSERTION(prefFonts, "null list of generic fonts");
   if (prefFonts && !prefFonts->IsEmpty()) {

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