Get the correct glyph index/advance on mac

src/servo/text/native_font/quartz_native_font.rs

@@ -5,7 +5,6 @@ export QuartzNativeFont, with_test_native_font, create;
 import libc::size_t;
 import ptr::null;
 import unsafe::reinterpret_cast;
-import result::{Result, Ok};
 import glyph::GlyphIndex;
 import cocoa::cg::{
     CGDataProviderRef,
@@ -18,6 +17,38 @@ import cocoa::cg::cg::{
     CGFontRelease
 };
 
+mod coretext {
+
+    type CTFontRef = *u8;
+    type UniChar = libc::c_ushort;
+    type CGGlyph = libc::c_ushort;
+    type CFIndex = libc::c_long;
+
+    type CTFontOrientation = u32;
+    const kCTFontDefaultOrientation: CTFontOrientation = 0;
+    const kCTFontHorizontalOrientation: CTFontOrientation = 1;
+    const kCTFontVerticalOrientation: CTFontOrientation = 2;
+
+    type CGFloat = libc::c_double;
+
+    struct CGSize {
+        width: CGFloat;
+        height: CGFloat;
+    }
+
+    type CGAffineTransform = ();
+    type CTFontDescriptorRef = *u8;
+
+    #[nolink]
+    #[link_args = "-framework ApplicationServices"]
+    extern mod coretext {
+        fn CTFontCreateWithGraphicsFont(graphicsFont: CGFontRef, size: CGFloat, matrix: *CGAffineTransform, attributes: CTFontDescriptorRef) -> CTFontRef;
+        fn CTFontGetGlyphsForCharacters(font: CTFontRef, characters: *UniChar, glyphs: *CGGlyph, count: CFIndex) -> bool;
+        fn CTFontGetAdvancesForGlyphs(font: CTFontRef, orientation: CTFontOrientation, glyphs: *CGGlyph, advances: *CGSize, count: CFIndex) -> libc::c_double;
+        fn CFRelease(font: CTFontRef);
+    }
+}
+
 struct QuartzNativeFont/& {
     let fontprov: CGDataProviderRef;
     let cgfont: CGFontRef;
@@ -38,18 +69,57 @@ struct QuartzNativeFont/& {
         CGDataProviderRelease(self.fontprov);
     }
 
-    fn glyph_index(_codepoint: char) -> Option<GlyphIndex> {
+    fn glyph_index(codepoint: char) -> Option<GlyphIndex> {
-        // FIXME
+
-        Some(40u)
+        import coretext::{UniChar, CGGlyph, CFIndex};
+        import coretext::coretext::{CFRelease, CTFontGetGlyphsForCharacters};
+         
+        let ctfont = ctfont_from_cgfont(self.cgfont);
+        assert ctfont.is_not_null();
+        let characters: ~[UniChar] = ~[codepoint as UniChar];
+        let glyphs: ~[mut CGGlyph] = ~[mut 0 as CGGlyph];
+        let count: CFIndex = 1;
+
+        let result = do vec::as_buf(characters) |character_buf, _l| {
+            do vec::as_buf(glyphs) |glyph_buf, _l| {
+                CTFontGetGlyphsForCharacters(ctfont, character_buf, glyph_buf, count)
+            }
+        };
+
+        assert result != false; // FIXME: error handling
+
+        CFRelease(ctfont);
+
+        assert glyphs[0] != 0; // FIXME: error handling
+        return Some(glyphs[0] as GlyphIndex);
     }
 
     // FIXME: What unit is this returning? Let's have a custom type
-    fn glyph_h_advance(_glyph: GlyphIndex) -> Option<int> {
+    fn glyph_h_advance(glyph: GlyphIndex) -> Option<int> {
-        // FIXME
+        import coretext::{CGGlyph, kCTFontDefaultOrientation};
-        Some(15)
+        import coretext::coretext::{CFRelease, CTFontGetAdvancesForGlyphs};
+
+        let ctfont = ctfont_from_cgfont(self.cgfont);
+        assert ctfont.is_not_null();
+        let glyphs = ~[glyph as CGGlyph];
+        let advance = do vec::as_buf(glyphs) |glyph_buf, _l| {
+            CTFontGetAdvancesForGlyphs(ctfont, kCTFontDefaultOrientation, glyph_buf, null(), 1)
+        };
+
+        CFRelease(ctfont);
+
+        return Some(advance as int);
     }
 }
 
+fn ctfont_from_cgfont(+cgfont: CGFontRef) -> coretext::CTFontRef unsafe {
+    import coretext::CGFloat;
+    import coretext::coretext::CTFontCreateWithGraphicsFont;
+
+    assert cgfont.is_not_null();
+    CTFontCreateWithGraphicsFont(cgfont, 21f as CGFloat, null(), null())
+}
+
 fn create(buf: &~[u8]) -> Result<QuartzNativeFont, ()> {
     let fontprov = vec::as_buf(*buf, |cbuf, len| {
         CGDataProviderCreateWithData(