Added Noto Sans Arabic

Added a font for Arabic, making the glyphs available for rendering.

Of course, this doesn't solve Arabic text rendering yet. There is still the RTL direction to work out and possibly some missing glyph combining rules.

IssueID #195

CMakeLists.txt

@@ -64,6 +64,7 @@ set (EMBED_RESOURCES
     res/fonts/Literata-LightItalic-opsz=10.ttf
     res/fonts/NanumGothic-Regular.ttf
     res/fonts/NotoEmoji-Regular.ttf
+    res/fonts/NotoSansArabicUI-Regular.ttf
     res/fonts/NotoSansJP-Regular.ttf
     res/fonts/NotoSansSC-Regular.ttf
     res/fonts/Nunito-Bold.ttf
@@ -188,6 +189,7 @@ set (SOURCES
     res/about/about.gmi
     res/about/help.gmi
     res/about/lagrange.gmi
+    res/about/license.gmi
     res/about/version.gmi
     ${CMAKE_CURRENT_BINARY_DIR}/resources.lgr
     ${CMAKE_CURRENT_BINARY_DIR}/embedded.c

res/about/license.gmi

@@ -104,7 +104,8 @@ This application uses fonts licensed under the Open Font License.
 => https://typeof.net/Iosevka/  Iosevka
 => https://github.com/googlefonts/literata/blob/master/OFL.txt  Literata
 => https://github.com/google/fonts/blob/master/ofl/nanumgothic/OFL.txt  Nanum Gothic
-=> https://www.google.com/get/noto/help/cjk/  Noto Sans CJK JP
+=> https://www.google.com/get/noto/#sans-arab  Noto Sans Arabic
+=> https://www.google.com/get/noto/help/cjk/  Noto Sans CJK (JP, SC)
 => https://github.com/googlefonts/nunito/blob/master/OFL.txt  Nunito
 => https://github.com/adobe-fonts/source-sans-pro/blob/release/LICENSE.md  Source Sans Pro
 

src/ui/text.c

@@ -331,6 +331,7 @@ static void initFonts_Text_(iText *d) {
         DEFINE_FONT_SET(fontNotoSansJPRegular_Embedded),
         DEFINE_FONT_SET(fontNotoSansSCRegular_Embedded),
         DEFINE_FONT_SET(fontNanumGothicRegular_Embedded), /* TODO: should use Noto Sans here, too */
+        DEFINE_FONT_SET(fontNotoSansArabicUIRegular_Embedded),
     };
     iForIndices(i, fontData) {
         iFont *font = &d->fonts[i];
@@ -584,6 +585,13 @@ iLocalDef iFont *characterFont_Font_(iFont *d, iChar ch, uint32_t *glyphIndex) {
             return japanese;
         }
     }
+    /* Maybe Arabic. */
+    if (ch >= 0x600) {
+        iFont *arabic = font_Text_(arabic_FontId + d->sizeId);
+        if (arabic != d && (*glyphIndex = glyphIndex_Font_(arabic, ch)) != 0) {
+            return arabic;
+        }
+    }
 #if defined (iPlatformApple)
     /* White up arrow is used for the Shift key on macOS. Symbola's glyph is not a great
        match to the other text, so use the UI font instead. */

src/ui/text.h

@@ -75,7 +75,8 @@ enum iFontId {
     japanese_FontId          = emoji_FontId + max_FontSize,
     chineseSimplified_FontId = japanese_FontId + max_FontSize,
     korean_FontId            = chineseSimplified_FontId + max_FontSize,
-    max_FontId               = korean_FontId + max_FontSize,
+    arabic_FontId            = korean_FontId + max_FontSize,
+    max_FontId               = arabic_FontId + max_FontSize,
 
     /* Meta: */
     mask_FontId               = 0xffff,