Rollup merge of rust-lang#84048 - konan8205:master, r=jsha

Avoid CJK legacy fonts in Windows

As metioned in rust-lang#84035, the default serif CJK font in Windows is meh-looking.
To avoid this, we should use sans-serif font or provide CJK glyph supported font in `rustdoc.css`.

Author: JohnTitor

src/librustdoc/html/render/write_shared.rs

@@ -33,6 +33,8 @@ crate static FILES_UNVERSIONED: Lazy<FxHashMap<&str, &[u8]>> = Lazy::new(|| {
         "SourceCodePro-Semibold.ttf.woff" => static_files::source_code_pro::SEMIBOLD,
         "SourceCodePro-It.ttf.woff" => static_files::source_code_pro::ITALIC,
         "SourceCodePro-LICENSE.txt" => static_files::source_code_pro::LICENSE,
+        "noto-sans-kr-v13-korean-regular.woff" => static_files::noto_sans_kr::REGULAR,
+        "noto-sans-kr-v13-korean-regular-LICENSE.txt" => static_files::noto_sans_kr::LICENSE,
         "LICENSE-MIT.txt" => static_files::LICENSE_MIT,
         "LICENSE-APACHE.txt" => static_files::LICENSE_APACHE,
         "COPYRIGHT.txt" => static_files::COPYRIGHT,

src/librustdoc/html/static/noto-sans-kr-v13-korean-regular-LICENSE.txt

@@ -0,0 +1,93 @@
+Copyright 2014, 2015 Adobe Systems Incorporated (http://www.adobe.com/), with Reserved Font Name 'Source'. All Rights Reserved. Source is a trademark of Adobe Systems Incorporated in the United States and/or other countries.
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+
+This license is copied below, and is also available with a FAQ at: http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded,
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

src/librustdoc/html/static/noto-sans-kr-v13-korean-regular.woff

@@ -66,6 +66,14 @@
 	font-display: swap;
 }
 
+/* Avoid using legacy CJK serif fonts in Windows like Batang */
+@font-face {
+	font-family: 'Noto Sans KR';
+	src: url("noto-sans-kr-v13-korean-regular.woff") format("woff");
+	font-display: swap;
+	unicode-range: U+A960-A97F, U+AC00-D7AF, U+D7B0-D7FF;
+}
+
 * {
 	-webkit-box-sizing: border-box;
 	-moz-box-sizing: border-box;
@@ -90,7 +98,7 @@ html {
 /* General structure and fonts */
 
 body {
-	font: 16px/1.4 "Source Serif 4", serif;
+	font: 16px/1.4 "Source Serif 4", "Noto Sans KR", serif;
 	margin: 0;
 	position: relative;
 	padding: 10px 15px 20px 15px;

src/librustdoc/html/static/rustdoc.css

@@ -126,6 +126,17 @@ crate mod source_code_pro {
     crate static LICENSE: &[u8] = include_bytes!("static/SourceCodePro-LICENSE.txt");
 }
 
+crate mod noto_sans_kr {
+    /// The file `noto-sans-kr-v13-korean-regular.woff`, the Regular variant of the Noto Sans KR
+    /// font.
+    crate static REGULAR: &[u8] = include_bytes!("static/noto-sans-kr-v13-korean-regular.woff");
+
+    /// The file `noto-sans-kr-v13-korean-regular-LICENSE.txt`, the license text of the Noto Sans KR
+    /// font.
+    crate static LICENSE: &[u8] =
+        include_bytes!("static/noto-sans-kr-v13-korean-regular-LICENSE.txt");
+}
+
 /// Files related to the sidebar in rustdoc sources.
 crate mod sidebar {
     /// File script to handle sidebar.

src/librustdoc/html/static_files.rs

@@ -14,3 +14,5 @@ SourceSerif4-Bold.ttf.woff
 SourceSerif4-It.ttf.woff
 SourceSerif4-LICENSE.md
 SourceSerif4-Regular.ttf.woff
+noto-sans-kr-v13-korean-regular-LICENSE.txt
+noto-sans-kr-v13-korean-regular.woff