Rename gfx to fonts (#32556)

This crate only takes care of fonts now as graphics related things are
split into other crates. In addition, this exposes data structures at
the top of the crate, hiding the implementation details and making it
simpler to import them.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Mukilan Thiyagarajan <mukilan@igalia.com>

components/fonts/tests/font_template.rs

@@ -0,0 +1,69 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+// Test doesn't yet run on Mac, see https://github.com/servo/servo/pull/19928 for explanation.
+#[cfg(not(target_os = "macos"))]
+#[test]
+fn test_font_template_descriptor() {
+    use std::fs::File;
+    use std::io::prelude::*;
+    use std::path::PathBuf;
+    use std::sync::Arc;
+
+    use fonts::platform::font::PlatformFont;
+    use fonts::{FontIdentifier, FontTemplateDescriptor, PlatformFontMethods};
+    use servo_url::ServoUrl;
+    use style::values::computed::font::{FontStretch, FontStyle, FontWeight};
+
+    fn descriptor(filename: &str) -> FontTemplateDescriptor {
+        let mut path: PathBuf = [
+            env!("CARGO_MANIFEST_DIR"),
+            "tests",
+            "support",
+            "dejavu-fonts-ttf-2.37",
+            "ttf",
+        ]
+        .iter()
+        .collect();
+        path.push(format!("{}.ttf", filename));
+
+        let identifier = FontIdentifier::Web(ServoUrl::from_file_path(path.clone()).unwrap());
+        let file = File::open(path.clone()).unwrap();
+        let data = file.bytes().map(|b| b.unwrap()).collect();
+        let handle = PlatformFont::new_from_data(identifier, Arc::new(data), 0, None).unwrap();
+        handle.descriptor()
+    }
+
+    assert_eq!(
+        descriptor("DejaVuSans"),
+        FontTemplateDescriptor::new(
+            FontWeight::NORMAL,
+            FontStretch::hundred(),
+            FontStyle::NORMAL,
+        )
+    );
+
+    assert_eq!(
+        descriptor("DejaVuSans-Bold"),
+        FontTemplateDescriptor::new(FontWeight::BOLD, FontStretch::hundred(), FontStyle::NORMAL,)
+    );
+
+    assert_eq!(
+        descriptor("DejaVuSans-Oblique"),
+        FontTemplateDescriptor::new(
+            FontWeight::NORMAL,
+            FontStretch::hundred(),
+            FontStyle::ITALIC,
+        )
+    );
+
+    assert_eq!(
+        descriptor("DejaVuSansCondensed-BoldOblique"),
+        FontTemplateDescriptor::new(
+            FontWeight::BOLD,
+            FontStretch::from_percentage(0.875),
+            FontStyle::ITALIC,
+        )
+    );
+}