Create FontStyle, FontFaceProperties, and hook up (hardcoded) adjustable font sizes. Also ripped out some native font tests that won't make sense with font machinery refactor.

src/servo/text/font.rs

@@ -19,25 +19,6 @@ use text::text_run::TextRun;
 // Used to abstract over the shaper's choice of fixed int representation.
 type FractionalPixel = float;
 
-/**
-A font handle. Layout can use this to calculate glyph metrics
-and the renderer can use it to render text.
-*/
-struct Font {
-    // TODO: is this actually needed? -bjb
-    // A back reference to keep the library alive
-    priv lib: @FontCache,
-    priv fontbuf: @~[u8],
-    priv native_font: NativeFont,
-    priv mut azure_font: Option<AzScaledFontRef>,
-    metrics: FontMetrics,
-
-    drop {
-        use azure::bindgen::AzReleaseScaledFont;
-        do (copy self.azure_font).iter |fontref| { AzReleaseScaledFont(*fontref); }
-    }
-}
-
 struct FontMetrics {
     underline_size:   Au,
     underline_offset: Au,
@@ -49,29 +30,80 @@ struct FontMetrics {
     max_advance:      Au
 }
 
-struct RunMetrics {
+// TODO: use enum from CSS bindings
-    // may be negative due to negative width
+enum CSSFontWeight {
-    advance_width: Au,
+    FontWeight100,
+    FontWeight200,
+    FontWeight300,
+    FontWeight400,
+    FontWeight500,
+    FontWeight600,
+    FontWeight700,
+    FontWeight800,
+    FontWeight900,
+}
 
+struct FontStyle {
+    pt_size: float,
+    weight: CSSFontWeight,
+    italic: bool,
+    oblique: bool,
+}
+
+struct FontFaceProperties {
+    family_name: @str,
+    face_name: ~str,
+    priv weight: u16,
+    priv italic: bool,
+}
+
+impl FontFaceProperties {
+    pure fn is_bold() -> bool { self.weight >= (500 as u16) }
+    pure fn is_italic() -> bool { self.italic }
+}
+
+struct RunMetrics {
+    // may be negative due to negative width (i.e., kerning of '.' in 'P.T.')
+    advance_width: Au,
     ascent: Au, // nonzero
     descent: Au, // nonzero
-
     // this bounding box is relative to the left origin baseline.
     // so, bounding_box.position.y = -ascent
     bounding_box: Rect<Au>
 }
 
+/**
+A font handle. Layout can use this to calculate glyph metrics
+and the renderer can use it to render text.
+*/
+struct Font {
+    // TODO: is this actually needed? -bjb
+    // A back reference to keep the library alive
+    priv lib: @FontCache,
+    priv fontbuf: @~[u8],
+    priv native_font: NativeFont,
+    priv mut azure_font: Option<AzScaledFontRef>,
+    style: FontStyle,
+    metrics: FontMetrics,
+
+    drop {
+        use azure::bindgen::AzReleaseScaledFont;
+        do (copy self.azure_font).iter |fontref| { AzReleaseScaledFont(*fontref); }
+    }
+}
+
 impl Font {
     // TODO: who should own fontbuf?
-    static fn new(lib: @FontCache, fontbuf: @~[u8], native_font: NativeFont) -> Font {
+    static fn new(lib: @FontCache, fontbuf: @~[u8], native_font: NativeFont, style: FontStyle) -> Font {
         let metrics = native_font.get_metrics();
 
         Font {
             lib: lib,
             fontbuf : fontbuf,
-            metrics: move metrics,
             native_font : move native_font,
-            azure_font: None
+            azure_font: None,
+            style: move style,
+            metrics: move metrics,
         }
     }
 
@@ -100,6 +132,7 @@ impl Font {
         // stones and manual memory management, and put them inside of
         // azure_hl.rs and elsewhere instead.
         let cfont = get_cairo_font(&self);
+        // TODO: This should probably not even use cairo
         let azfont = AzCreateScaledFontWithCairo(ptr::to_unsafe_ptr(&nfont), 1f as AzFloat, cfont);
         assert azfont.is_not_null();
         cairo_scaled_font_destroy(cfont);
@@ -107,6 +140,9 @@ impl Font {
         self.azure_font = Some(azfont);
         return azfont;
 
+        // TODO: these cairo-related things should be in rust-cairo.
+        // creating a cairo font/face from a native font resource
+        // should be part of the NativeFont API, not exposed here.
         #[cfg(target_os = "linux")]
         fn get_cairo_face(font: &Font) -> *cairo_font_face_t {
             use cairo::cairo_ft::bindgen::{cairo_ft_font_face_create_for_ft_face};
@@ -151,10 +187,14 @@ impl Font {
             cairo_matrix_init_identity(ptr::to_unsafe_ptr(&idmatrix));
 
             let fontmatrix = idmatrix;
-            cairo_matrix_scale(ptr::to_unsafe_ptr(&fontmatrix), 21f as c_double, 21f as c_double);
+            cairo_matrix_scale(ptr::to_unsafe_ptr(&fontmatrix),
+                               font.style.pt_size as c_double, 
+                               font.style.pt_size as c_double);
             let options = cairo_font_options_create();
-            let cfont = cairo_scaled_font_create(face, ptr::to_unsafe_ptr(&fontmatrix),
+            let cfont = cairo_scaled_font_create(face, 
-                                                 ptr::to_unsafe_ptr(&idmatrix), options);
+                                                 ptr::to_unsafe_ptr(&fontmatrix),
+                                                 ptr::to_unsafe_ptr(&idmatrix), 
+                                                 options);
             cairo_font_options_destroy(options);
             cairo_font_face_destroy(face);
 

src/servo/text/font_cache.rs

@@ -1,4 +1,7 @@
-use font::{Font, test_font_bin};
+use font::{Font,
+           FontStyle,
+           FontWeight300,
+           test_font_bin};
 
 struct FontCache {
     native_lib: native::NativeFontCache,
@@ -37,13 +40,20 @@ fn FontCache() -> @FontCache {
 
 fn create_font(lib: @FontCache, native_lib: &native::NativeFontCache) -> Result<@Font, ()> {
     let font_bin = @test_font_bin();
-    let native_font = native_font::create(native_lib, font_bin);
+    let dummy_style = FontStyle {
+        pt_size: 40f,
+        weight: FontWeight300,
+        italic: false,
+        oblique: false
+    };
+    let native_font = native_font::create(native_lib, font_bin, dummy_style.pt_size);
     let native_font = if native_font.is_ok() {
         result::unwrap(move native_font)
     } else {
         return Err(native_font.get_err());
     };
-    return Ok(@Font::new(lib, font_bin, move native_font));
+
+    return Ok(@Font::new(lib, font_bin, move native_font, move dummy_style));
 }
 
 #[cfg(target_os = "linux")]

src/servo/text/native_font.rs

@@ -14,57 +14,13 @@ pub type NativeFont/& = quartz_native_font::QuartzNativeFont;
 #[cfg(target_os = "linux")]
 pub type NativeFont/& = ft_native_font::FreeTypeNativeFont;
 
+// TODO: this should be part of trait NativeFont
 #[cfg(target_os = "macos")]
-pub fn create(_native_lib: &NativeFontCache, buf: @~[u8]) -> Result<NativeFont, ()> {
+pub fn create(native_lib: &NativeFontCache, buf: @~[u8], pt_size: float) -> Result<NativeFont, ()> {
-    quartz_native_font::create(buf)
+    quartz_native_font::create(native_lib, buf, pt_size)
 }
 
 #[cfg(target_os = "linux")]
-pub fn create(native_lib: &NativeFontCache, buf: @~[u8]) -> Result<NativeFont, ()> {
+pub fn create(native_lib: &NativeFontCache, buf: @~[u8], pt_size: float) -> Result<NativeFont, ()> {
-    ft_native_font::create(native_lib, buf)
+    ft_native_font::create(native_lib, buf, pt_size)
-}
-
-#[cfg(target_os = "macos")]
-pub fn with_test_native_font(f: fn@(nf: &NativeFont)) {
-    quartz_native_font::with_test_native_font(f);
-}
-
-#[cfg(target_os = "linux")]
-pub fn with_test_native_font(f: fn@(nf: &NativeFont)) {
-    ft_native_font::with_test_native_font(f);
-}
-
-#[test]
-fn should_get_glyph_indexes() {
-    with_test_native_font(|font| {
-        let idx = font.glyph_index('w');
-        assert idx == Some(40u as GlyphIndex);
-    })
-}
-
-#[test]
-fn should_return_none_glyph_index_for_bad_codepoints() {
-    with_test_native_font(|font| {
-        let idx = font.glyph_index(0 as char);
-        assert idx == None;
-    })
-}
-
-#[test]
-#[ignore]
-fn should_get_glyph_h_advance() {
-    with_test_native_font(|font| {
-        let adv = font.glyph_h_advance(40u as GlyphIndex);
-        // TODO: add correct advances; these are old
-        assert adv == Some(15f);
-    })
-}
-
-#[test]
-#[ignore]
-fn should_return_none_glyph_h_advance_for_bad_codepoints() {
-    with_test_native_font(|font| {
-        let adv = font.glyph_h_advance(-1 as GlyphIndex);
-        assert adv == None;
-    })
 }

src/servo/text/native_font/ft_native_font.rs

@@ -130,14 +130,18 @@ pub impl FreeTypeNativeFont {
     }
 }
 
-pub fn create(lib: &FT_Library, buf: @~[u8]) -> Result<FreeTypeNativeFont, ()> {
+pub fn create(lib: &FT_Library, buf: @~[u8], pt_size: float) -> Result<FreeTypeNativeFont, ()> {
     assert lib.is_not_null();
     let face: FT_Face = null();
     return vec_as_buf(*buf, |cbuf, _len| {
            if FT_New_Memory_Face(*lib, cbuf, (*buf).len() as FT_Long,
                                  0 as FT_Long, addr_of(&face)).succeeded() {
                // FIXME: These values are placeholders
-               let res = FT_Set_Char_Size(face, 0, 20*64, 0, 72);
+               let res = FT_Set_Char_Size(face, // the face
+                                          float_to_fixed_ft(pt_size), // char width
+                                          float_to_fixed_ft(pt_size), // char height
+                                          72, // horiz. DPI
+                                          72); // vert. DPI
                if !res.succeeded() { fail ~"unable to set font char size" }
                Ok(FreeTypeNativeFont(face, buf))
            } else {
@@ -153,29 +157,3 @@ trait FTErrorMethods {
 impl FT_Error : FTErrorMethods {
     fn succeeded() -> bool { self == 0 as FT_Error }
 }
-
-pub fn with_test_native_font(f: fn@(nf: &NativeFont)) {
-    use font::test_font_bin;
-    use unwrap_result = result::unwrap;
-
-    with_lib(|lib| {
-        let buf = @test_font_bin();
-        let font = unwrap_result(create(lib, move buf));
-        f(&font);
-    })
-}
-
-fn with_lib(f: fn@((&FT_Library))) {
-    let lib: FT_Library = null();
-    assert FT_Init_FreeType(addr_of(&lib)).succeeded();
-    f(&lib);
-    FT_Done_FreeType(lib);
-}
-
-#[test]
-fn create_should_return_err_if_buf_is_bogus() {
-    with_lib(|lib| {
-        let buf = @~[];
-        assert create(lib, buf).is_err();
-    })
-}

src/servo/text/native_font/quartz_native_font.rs

@@ -68,11 +68,11 @@ pub struct QuartzNativeFont {
     }
 }
 
-fn QuartzNativeFont(fontprov: CGDataProviderRef, cgfont: CGFontRef) -> QuartzNativeFont {
+fn QuartzNativeFont(fontprov: CGDataProviderRef, cgfont: CGFontRef, pt_size: float) -> QuartzNativeFont {
     assert fontprov.is_not_null();
     assert cgfont.is_not_null();
 
-    let ctfont = ctfont_from_cgfont(cgfont);
+    let ctfont = ctfont_from_cgfont(cgfont, pt_size);
     assert ctfont.is_not_null();
 
     QuartzNativeFont {
@@ -143,14 +143,13 @@ impl QuartzNativeFont {
     }
 }
 
-fn ctfont_from_cgfont(cgfont: CGFontRef) -> CTFontRef {
+fn ctfont_from_cgfont(cgfont: CGFontRef, pt_size: float) -> CTFontRef {
     assert cgfont.is_not_null();
 
-    // TODO: use actual font size here!
+    CTFontCreateWithGraphicsFont(cgfont, pt_size as CGFloat, null(), null())
-    CTFontCreateWithGraphicsFont(cgfont, 21f as CGFloat, null(), null())
 }
 
-pub fn create(buf: @~[u8]) -> Result<QuartzNativeFont, ()> {
+pub fn create(_lib: &NativeFontCache, buf: @~[u8], pt_size: float) -> Result<QuartzNativeFont, ()> {
     let fontprov = vec::as_imm_buf(*buf, |cbuf, len| {
         CGDataProviderCreateWithData(
             null(),
@@ -163,18 +162,8 @@ pub fn create(buf: @~[u8]) -> Result<QuartzNativeFont, ()> {
     let cgfont = CGFontCreateWithDataProvider(fontprov);
 
     match cgfont.is_not_null() {
-        true => Ok(QuartzNativeFont(fontprov, cgfont)),
+        true => Ok(QuartzNativeFont(fontprov, cgfont, pt_size)),
         false => Err(())
     }
     
 }
-
-pub fn with_test_native_font(f: fn@(nf: &NativeFont)) {
-    use font::test_font_bin;
-    use unwrap_result = result::unwrap;
-
-    let buf = @test_font_bin();
-    let res = create(buf);
-    let font = unwrap_result(move res);
-    f(&font);
-}