add some android port materials into gfx

src/components/gfx/font.rs

@@ -353,6 +353,7 @@ impl Font {
     }
 
     #[cfg(target_os="linux")]
+    #[cfg(target_os="android")]
     fn create_azure_font(&self) -> ScaledFont {
         let freetype_font = self.handle.face;
         let size = self.style.pt_size as AzFloat;

src/components/gfx/gfx.rc

@@ -20,9 +20,9 @@ extern mod servo_msg (name = "msg");
 // shapers. For now, however, this is a hard dependency.
 extern mod harfbuzz;
 
-// Linux-specific library dependencies
-#[cfg(target_os="linux")] extern mod fontconfig;
-#[cfg(target_os="linux")] extern mod freetype;
+// Linux and Android-specific library dependencies
+#[cfg(target_os="linux")] #[cfg(target_os="android")] extern mod fontconfig;
+#[cfg(target_os="linux")] #[cfg(target_os="android")] extern mod freetype;
 
 // Mac OS-specific library dependencies
 #[cfg(target_os="macos")] extern mod core_foundation;

src/components/gfx/platform/android/font.rs

@@ -0,0 +1,331 @@
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+extern mod freetype;
+
+use font::{CSSFontWeight, FontHandleMethods, FontMetrics, FontTableMethods};
+use font::{FontTableTag, FractionalPixel, SpecifiedFontStyle, UsedFontStyle, FontWeight100};
+use font::{FontWeight200, FontWeight300, FontWeight400, FontWeight500, FontWeight600};
+use font::{FontWeight700, FontWeight800, FontWeight900};
+use geometry::Au;
+use geometry;
+use platform::font_context::FontContextHandle;
+use text::glyph::GlyphIndex;
+use text::util::{float_to_fixed, fixed_to_float};
+
+use freetype::freetype::{FT_Get_Char_Index, FT_Get_Postscript_Name};
+use freetype::freetype::{FT_Load_Glyph, FT_Set_Char_Size};
+use freetype::freetype::{FT_New_Face, FT_Get_Sfnt_Table};
+use freetype::freetype::{FT_New_Memory_Face, FT_Done_Face};
+use freetype::freetype::{FTErrorMethods, FT_F26Dot6, FT_Face, FT_FaceRec};
+use freetype::freetype::{FT_GlyphSlot, FT_Library, FT_Long, FT_ULong};
+use freetype::freetype::{FT_STYLE_FLAG_ITALIC, FT_STYLE_FLAG_BOLD};
+use freetype::freetype::{FT_SizeRec, FT_UInt, FT_Size_Metrics};
+use freetype::freetype::{ft_sfnt_os2};
+use freetype::tt_os2::TT_OS2;
+
+use std::cast;
+use std::ptr;
+use std::str;
+
+fn float_to_fixed_ft(f: float) -> i32 {
+    float_to_fixed(6, f)
+}
+
+fn fixed_to_float_ft(f: i32) -> float {
+    fixed_to_float(6, f)
+}
+
+pub struct FontTable {
+    bogus: ()
+}
+
+impl FontTableMethods for FontTable {
+    fn with_buffer(&self, _blk: &fn(*u8, uint)) {
+        fail!()
+    }
+}
+
+enum FontSource {
+    FontSourceMem(~[u8]),
+    FontSourceFile(~str)
+}
+
+pub struct FontHandle {
+    // The font binary. This must stay valid for the lifetime of the font,
+    // if the font is created using FT_Memory_Face.
+    source: FontSource,
+    face: FT_Face,
+    handle: FontContextHandle
+}
+
+#[unsafe_destructor]
+impl Drop for FontHandle {
+    fn drop(&self) {
+        assert!(self.face.is_not_null());
+        unsafe {
+            if !FT_Done_Face(self.face).succeeded() {
+                fail!(~"FT_Done_Face failed");
+            }
+        }
+    }
+}
+
+impl FontHandleMethods for FontHandle {
+    fn new_from_buffer(fctx: &FontContextHandle,
+                           buf: ~[u8],
+                           style: &SpecifiedFontStyle)
+                        -> Result<FontHandle, ()> {
+        let ft_ctx: FT_Library = fctx.ctx.ctx;
+        if ft_ctx.is_null() { return Err(()); }
+
+        let face_result = do buf.as_imm_buf |bytes: *u8, len: uint| {
+            create_face_from_buffer(ft_ctx, bytes, len, style.pt_size)
+        };
+
+        // TODO: this could be more simply written as result::chain
+        // and moving buf into the struct ctor, but cant' move out of
+        // captured binding.
+        return match face_result {
+            Ok(face) => {
+              let handle = FontHandle {
+                  face: face,
+                  source: FontSourceMem(buf),
+                  handle: *fctx
+              };
+              Ok(handle)
+            }
+            Err(()) => Err(())
+        };
+
+         fn create_face_from_buffer(lib: FT_Library,
+                                    cbuf: *u8, cbuflen: uint, pt_size: float) 
+             -> Result<FT_Face, ()> {
+
+             unsafe {
+                 let mut face: FT_Face = ptr::null();
+                 let face_index = 0 as FT_Long;
+                 let result = FT_New_Memory_Face(lib, cbuf, cbuflen as FT_Long,
+                                                 face_index, ptr::to_mut_unsafe_ptr(&mut face));
+                 
+                 if !result.succeeded() || face.is_null() {
+                     return Err(());
+                 }
+                 if FontHandle::set_char_size(face, pt_size).is_ok() {
+                     Ok(face)
+                 } else {
+                     Err(())
+                 }
+             }
+         }
+    }
+
+    // an identifier usable by FontContextHandle to recreate this FontHandle.
+    fn face_identifier(&self) -> ~str {
+        /* FT_Get_Postscript_Name seems like a better choice here, but it
+           doesn't give usable results for fontconfig when deserializing. */
+        unsafe { str::raw::from_c_str((*self.face).family_name) }
+    }
+    fn family_name(&self) -> ~str {
+        unsafe { str::raw::from_c_str((*self.face).family_name) }
+    }
+    fn face_name(&self) -> ~str {
+        unsafe { str::raw::from_c_str(FT_Get_Postscript_Name(self.face)) }
+    }
+    fn is_italic(&self) -> bool {
+        unsafe { (*self.face).style_flags & FT_STYLE_FLAG_ITALIC != 0 }
+    }
+    fn boldness(&self) -> CSSFontWeight {
+        let default_weight = FontWeight400;
+        if unsafe { (*self.face).style_flags & FT_STYLE_FLAG_BOLD == 0 } {
+            default_weight
+        } else {
+            unsafe {
+                let os2 = FT_Get_Sfnt_Table(self.face, ft_sfnt_os2) as *TT_OS2;
+                let valid = os2.is_not_null() && (*os2).version != 0xffff;
+                if valid {
+                    let weight =(*os2).usWeightClass;
+                    match weight {
+                        1 | 100..199 => FontWeight100,
+                        2 | 200..299 => FontWeight200,
+                        3 | 300..399 => FontWeight300,
+                        4 | 400..499 => FontWeight400,
+                        5 | 500..599 => FontWeight500,
+                        6 | 600..699 => FontWeight600,
+                        7 | 700..799 => FontWeight700,
+                        8 | 800..899 => FontWeight800,
+                        9 | 900..999 => FontWeight900,
+                        _ => default_weight
+                    }
+                } else {
+                    default_weight
+                }
+            }
+        }
+    }
+
+    fn clone_with_style(&self,
+                        fctx: &FontContextHandle,
+                        style: &UsedFontStyle) -> Result<FontHandle, ()> {
+        match self.source {
+            FontSourceMem(ref buf) => {
+                FontHandleMethods::new_from_buffer(fctx, buf.clone(), style)
+            }
+            FontSourceFile(ref file) => {
+                FontHandle::new_from_file(fctx, (*file).clone(), style)
+            }
+        }
+    }
+
+    fn glyph_index(&self,
+                       codepoint: char) -> Option<GlyphIndex> {
+        assert!(self.face.is_not_null());
+        unsafe {
+            let idx = FT_Get_Char_Index(self.face, codepoint as FT_ULong);
+            return if idx != 0 as FT_UInt {
+                Some(idx as GlyphIndex)
+            } else {
+                debug!("Invalid codepoint: %?", codepoint);
+                None
+            };
+        }
+    }
+
+    fn glyph_h_advance(&self,
+                           glyph: GlyphIndex) -> Option<FractionalPixel> {
+        assert!(self.face.is_not_null());
+        unsafe {
+            let res =  FT_Load_Glyph(self.face, glyph as FT_UInt, 0);
+            if res.succeeded() {
+                let void_glyph = (*self.face).glyph;
+                let slot: FT_GlyphSlot = cast::transmute(void_glyph);
+                assert!(slot.is_not_null());
+                debug!("metrics: %?", (*slot).metrics);
+                let advance = (*slot).metrics.horiAdvance;
+                debug!("h_advance for %? is %?", glyph, advance);
+                let advance = advance as i32;
+                return Some(fixed_to_float_ft(advance) as FractionalPixel);
+            } else {
+                debug!("Unable to load glyph %?. reason: %?", glyph, res);
+                return None;
+            }
+        }
+    }
+
+    fn get_metrics(&self) -> FontMetrics {
+        /* TODO(Issue #76): complete me */
+        let face = self.get_face_rec();
+
+        let underline_size = self.font_units_to_au(face.underline_thickness as float);
+        let underline_offset = self.font_units_to_au(face.underline_position as float);
+        let em_size = self.font_units_to_au(face.units_per_EM as float);
+        let ascent = self.font_units_to_au(face.ascender as float);
+        let descent = self.font_units_to_au(face.descender as float);
+        let max_advance = self.font_units_to_au(face.max_advance_width as float);
+
+        return FontMetrics {
+            underline_size:   underline_size,
+            underline_offset: underline_offset,
+            leading:          geometry::from_pt(0.0), //FIXME
+            x_height:         geometry::from_pt(0.0), //FIXME
+            em_size:          em_size,
+            ascent:           ascent,
+            descent:          -descent, // linux font's seem to use the opposite sign from mac
+            max_advance:      max_advance
+        }
+    }
+
+    fn get_table_for_tag(&self, _: FontTableTag) -> Option<FontTable> {
+        None
+    }
+}
+
+impl<'self> FontHandle {
+    fn set_char_size(face: FT_Face, pt_size: float) -> Result<(), ()>{
+        let char_width = float_to_fixed_ft(pt_size) as FT_F26Dot6;
+        let char_height = float_to_fixed_ft(pt_size) as FT_F26Dot6;
+        let h_dpi = 72;
+        let v_dpi = 72;
+
+        unsafe {
+            let result = FT_Set_Char_Size(face, char_width, char_height, h_dpi, v_dpi);
+            if result.succeeded() { Ok(()) } else { Err(()) }
+        }
+    }
+
+    pub fn new_from_file(fctx: &FontContextHandle, file: ~str,
+                         style: &SpecifiedFontStyle) -> Result<FontHandle, ()> {
+        unsafe {
+            let ft_ctx: FT_Library = fctx.ctx.ctx;
+            if ft_ctx.is_null() { return Err(()); }
+
+            let mut face: FT_Face = ptr::null();
+            let face_index = 0 as FT_Long;
+            do file.to_c_str().with_ref |file_str| {
+                FT_New_Face(ft_ctx, file_str,
+                            face_index, ptr::to_mut_unsafe_ptr(&mut face));
+            }
+            if face.is_null() {
+                return Err(());
+            }
+            if FontHandle::set_char_size(face, style.pt_size).is_ok() {
+                Ok(FontHandle {
+                    source: FontSourceFile(file),
+                    face: face,
+                    handle: *fctx
+                })
+            } else {
+                Err(())
+            }
+        }
+    }
+
+    pub fn new_from_file_unstyled(fctx: &FontContextHandle, file: ~str)
+                               -> Result<FontHandle, ()> {
+        unsafe {
+            let ft_ctx: FT_Library = fctx.ctx.ctx;
+            if ft_ctx.is_null() { return Err(()); }
+
+            let mut face: FT_Face = ptr::null();
+            let face_index = 0 as FT_Long;
+            do file.to_c_str().with_ref |file_str| {
+                FT_New_Face(ft_ctx, file_str,
+                            face_index, ptr::to_mut_unsafe_ptr(&mut face));
+            }
+            if face.is_null() {
+                return Err(());
+            }
+
+            Ok(FontHandle {
+                source: FontSourceFile(file),
+                face: face,
+                handle: *fctx
+            })
+        }
+    }
+
+    fn get_face_rec(&'self self) -> &'self FT_FaceRec {
+        unsafe {
+            &(*self.face)
+        }
+    }
+
+    fn font_units_to_au(&self, value: float) -> Au {
+        let face = self.get_face_rec();
+
+        // face.size is a *c_void in the bindings, presumably to avoid
+        // recursive structural types
+        let size: &FT_SizeRec = unsafe { cast::transmute(&(*face.size)) };
+        let metrics: &FT_Size_Metrics = &(*size).metrics;
+
+        let em_size = face.units_per_EM as float;
+        let x_scale = (metrics.x_ppem as float) / em_size as float;
+
+        // If this isn't true then we're scaling one of the axes wrong
+        assert!(metrics.x_ppem == metrics.y_ppem);
+
+        return geometry::from_frac_px(value * x_scale);
+    }
+}
+

src/components/gfx/platform/android/font_context.rs

@@ -0,0 +1,60 @@
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+use font::UsedFontStyle;
+use platform::font::FontHandle;
+use font_context::FontContextHandleMethods;
+use platform::font_list::path_from_identifier;
+
+use freetype::freetype::{FTErrorMethods, FT_Library};
+use freetype::freetype::{FT_Done_FreeType, FT_Init_FreeType};
+
+use std::ptr;
+
+struct FreeTypeLibraryHandle {
+    ctx: FT_Library,
+}
+
+impl Drop for FreeTypeLibraryHandle {
+    fn drop(&self) {
+        assert!(self.ctx.is_not_null());
+        unsafe {
+            FT_Done_FreeType(self.ctx);
+        }
+    }
+}
+
+pub struct FontContextHandle {
+    ctx: @FreeTypeLibraryHandle,
+}
+
+impl FontContextHandle {
+    pub fn new() -> FontContextHandle {
+        unsafe {
+            let ctx: FT_Library = ptr::null();
+            let result = FT_Init_FreeType(ptr::to_unsafe_ptr(&ctx));
+            if !result.succeeded() { fail!(); }
+
+            FontContextHandle { 
+                ctx: @FreeTypeLibraryHandle { ctx: ctx },
+            }
+        }
+    }
+}
+
+impl FontContextHandleMethods for FontContextHandle {
+    fn clone(&self) -> FontContextHandle {
+        FontContextHandle { ctx: self.ctx }
+    }
+
+    fn create_font_from_identifier(&self, name: ~str, style: UsedFontStyle)
+                                -> Result<FontHandle, ()> {
+        debug!("Creating font handle for %s", name);
+        do path_from_identifier(name, &style).chain |file_name| {
+            debug!("Opening font face %s", file_name);
+            FontHandle::new_from_file(self, file_name, &style)
+        }
+    }
+}
+

src/components/gfx/platform/android/font_list.rs

@@ -0,0 +1,205 @@
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+extern mod freetype;
+extern mod fontconfig;
+
+use fontconfig::fontconfig::{
+    FcChar8, FcResultMatch, FcSetSystem, FcPattern,
+    FcResultNoMatch, FcMatchPattern, FC_SLANT_ITALIC, FC_WEIGHT_BOLD
+};
+use fontconfig::fontconfig::{
+    FcConfigGetCurrent, FcConfigGetFonts, FcPatternGetString,
+    FcPatternDestroy, FcFontSetDestroy, FcConfigSubstitute,
+    FcDefaultSubstitute, FcPatternCreate, FcPatternAddString, FcPatternAddInteger,
+    FcFontMatch, FcFontSetList, FcObjectSetCreate, FcObjectSetDestroy,
+    FcObjectSetAdd, FcPatternGetInteger
+};
+
+
+use font::{FontHandleMethods, UsedFontStyle};
+use font_context::FontContextHandleMethods;
+use font_list::{FontEntry, FontFamily, FontFamilyMap};
+use platform::font::FontHandle;
+use platform::font_context::FontContextHandle;
+
+use std::hashmap::HashMap;
+use std::libc;
+use std::libc::{c_int, c_char};
+use std::ptr;
+use std::str;
+
+pub struct FontListHandle {
+    fctx: FontContextHandle,
+}
+
+impl FontListHandle {
+    pub fn new(fctx: &FontContextHandle) -> FontListHandle {
+        FontListHandle { fctx: fctx.clone() }
+    }
+
+    pub fn get_available_families(&self) -> FontFamilyMap {
+        let mut family_map : FontFamilyMap = HashMap::new();
+        unsafe {
+            let config = FcConfigGetCurrent();
+            let fontSet = FcConfigGetFonts(config, FcSetSystem);
+            for i in range(0, (*fontSet).nfont as int) {
+                let font = (*fontSet).fonts.offset(i);
+                let family: *FcChar8 = ptr::null();
+                let mut v: c_int = 0;
+                do "family".to_c_str().with_ref |FC_FAMILY| {
+                    while FcPatternGetString(*font, FC_FAMILY, v, &family) == FcResultMatch {
+                        let family_name = str::raw::from_c_str(family as *c_char);
+                        debug!("Creating new FontFamily for family: %s", family_name);
+                        let new_family = @mut FontFamily::new(family_name);
+                        family_map.insert(family_name, new_family);
+                        v += 1;
+                    }
+                }
+            }
+        }
+        return family_map;
+    }
+
+    pub fn load_variations_for_family(&self, family: @mut FontFamily) {
+        debug!("getting variations for %?", family);
+        unsafe {
+            let config = FcConfigGetCurrent();
+            let font_set = FcConfigGetFonts(config, FcSetSystem);
+            let font_set_array_ptr = ptr::to_unsafe_ptr(&font_set);
+            let pattern = FcPatternCreate();
+            assert!(pattern.is_not_null());
+            do "family".to_c_str().with_ref |FC_FAMILY| {
+                do family.family_name.to_c_str().with_ref |family_name| {
+                    let ok = FcPatternAddString(pattern, FC_FAMILY, family_name as *FcChar8);
+                    assert!(ok != 0);
+                }
+            }
+
+            let object_set = FcObjectSetCreate();
+            assert!(object_set.is_not_null());
+
+            do "file".to_c_str().with_ref |FC_FILE| {
+                FcObjectSetAdd(object_set, FC_FILE);
+            }
+            do "index".to_c_str().with_ref |FC_INDEX| {
+                FcObjectSetAdd(object_set, FC_INDEX);
+            }
+
+            let matches = FcFontSetList(config, font_set_array_ptr, 1, pattern, object_set);
+
+            debug!("found %? variations", (*matches).nfont);
+
+            for i in range(0, (*matches).nfont as int) {
+                let font = (*matches).fonts.offset(i);
+                let file = do "file".to_c_str().with_ref |FC_FILE| {
+                    let file: *FcChar8 = ptr::null();
+                    if FcPatternGetString(*font, FC_FILE, 0, &file) == FcResultMatch {
+                        str::raw::from_c_str(file as *libc::c_char)
+                    } else {
+                        fail!();
+                    }
+                };
+                let index = do "index".to_c_str().with_ref |FC_INDEX| {
+                    let index: libc::c_int = 0;
+                    if FcPatternGetInteger(*font, FC_INDEX, 0, &index) == FcResultMatch {
+                        index
+                    } else {
+                        fail!();
+                    }
+                };
+
+                debug!("variation file: %?", file);
+                debug!("variation index: %?", index);
+
+                let font_handle = FontHandle::new_from_file_unstyled(&self.fctx,
+                                                                     file);
+                let font_handle = font_handle.unwrap();
+
+                debug!("Creating new FontEntry for face: %s", font_handle.face_name());
+                let entry = @FontEntry::new(font_handle);
+                family.entries.push(entry);
+            }
+
+            FcFontSetDestroy(matches);
+            FcPatternDestroy(pattern);
+            FcObjectSetDestroy(object_set);
+        }
+    }
+
+    pub fn get_last_resort_font_families() -> ~[~str] {
+        ~[~"Roboto"]
+    }
+}
+
+struct AutoPattern {
+    pattern: *FcPattern
+}
+
+impl Drop for AutoPattern {
+    fn drop(&self) {
+        unsafe {
+            FcPatternDestroy(self.pattern);
+        }
+    }
+}
+
+pub fn path_from_identifier(name: ~str, style: &UsedFontStyle) -> Result<~str, ()> {
+    unsafe {
+        let config = FcConfigGetCurrent();
+        let wrapper = AutoPattern { pattern: FcPatternCreate() };
+        let pattern = wrapper.pattern;
+        let res = do "family".to_c_str().with_ref |FC_FAMILY| {
+            do name.to_c_str().with_ref |family| {
+                FcPatternAddString(pattern, FC_FAMILY, family as *FcChar8)
+            }
+        };
+        if res != 1 {
+            debug!("adding family to pattern failed");
+            return Err(());
+        }
+
+        if style.italic {
+            let res = do "slant".to_c_str().with_ref |FC_SLANT| {
+                FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC)
+            };
+            if res != 1 {
+                debug!("adding slant to pattern failed");
+                return Err(());
+            }
+        }
+        if style.weight.is_bold() {
+            let res = do "weight".to_c_str().with_ref |FC_WEIGHT| {
+                FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD)
+            };
+            if res != 1 {
+                debug!("adding weight to pattern failed");
+                return Err(());
+            }
+        }
+
+        if FcConfigSubstitute(config, pattern, FcMatchPattern) != 1 {
+            debug!("substitution failed");
+            return Err(());
+        }
+        FcDefaultSubstitute(pattern);
+        let result = FcResultNoMatch;
+        let result_wrapper = AutoPattern { pattern: FcFontMatch(config, pattern, &result) };
+        let result_pattern = result_wrapper.pattern;
+        if result != FcResultMatch && result_pattern.is_null() {
+            debug!("obtaining match to pattern failed");
+            return Err(());
+        }
+
+        let file: *FcChar8 = ptr::null();
+        let res = do "file".to_c_str().with_ref |FC_FILE| {
+            FcPatternGetString(result_pattern, FC_FILE, 0, &file)
+        };
+        if res != FcResultMatch {
+            debug!("getting filename for font failed");
+            return Err(());
+        }
+        Ok(str::raw::from_c_str(file as *c_char))
+    }
+}

src/components/gfx/platform/mod.rs

@@ -4,6 +4,7 @@
 
 #[cfg(target_os="linux")] pub use platform::linux::{font, font_context, font_list};
 #[cfg(target_os="macos")] pub use platform::macos::{font, font_context, font_list};
+#[cfg(target_os="android")] pub use platform::android::{font, font_context, font_list};
 
 #[cfg(target_os="linux")]
 pub mod linux {
@@ -19,3 +20,9 @@ pub mod macos {
     pub mod font_list;
 }
 
+#[cfg(target_os="android")]
+pub mod android {
+    pub mod font;
+    pub mod font_context;
+    pub mod font_list;
+}