Store text run's font on the TextRun object; write a dummy serialize/deserialize method so textruns can still be copied into/out of display list.

src/servo/gfx/display_list.rs

@@ -4,11 +4,12 @@ use gfx::geometry::*;
 use geom::rect::Rect;
 use image::base::Image;
 use render_task::RenderContext;
+use servo_text::text_run;
 
 use std::arc::ARC;
 use clone_arc = std::arc::clone;
 use dvec::DVec;
-use text::text_run::TextRun;
+use text::text_run::SendableTextRun;
 
 pub use layout::display_list_builder::DisplayListBuilder;
 
@@ -24,7 +25,7 @@ pub enum DisplayItemData {
     // TODO: need to provide spacing data for text run.
     // (i.e, to support rendering of CSS 'word-spacing' and 'letter-spacing')
     // TODO: don't copy text runs, ever.
-    TextData(~TextRun, uint, uint),
+    TextData(~SendableTextRun, uint, uint),
     ImageData(ARC<~image::base::Image>),
 }
 
@@ -37,7 +38,10 @@ fn draw_SolidColor(self: &DisplayItem, ctx: &RenderContext) {
 
 fn draw_Text(self: &DisplayItem, ctx: &RenderContext) {
     match self.data {
-        TextData(~run, offset, len) => draw_text(ctx, self.bounds, &run, offset, len),
+        TextData(run, offset, len) => {
+            let new_run = text_run::deserialize(ctx.font_cache, run);
+            draw_text(ctx, self.bounds, new_run, offset, len)
+        },
         _ => fail
     }        
 }
@@ -57,7 +61,7 @@ pub fn SolidColor(bounds: Rect<au>, r: u8, g: u8, b: u8) -> DisplayItem {
     }
 }
 
-pub fn Text(bounds: Rect<au>, run: ~TextRun, offset: uint, length: uint) -> DisplayItem {
+pub fn Text(bounds: Rect<au>, run: ~SendableTextRun, offset: uint, length: uint) -> DisplayItem {
     DisplayItem {
         draw: |self, ctx| draw_Text(self, ctx),
         bounds: bounds,

src/servo/gfx/render_task.rs

@@ -172,8 +172,7 @@ pub fn draw_text(ctx: &RenderContext, bounds: Rect<au>, run: &TextRun, offset: u
                             AzReleaseColorPattern};
     use azure::cairo::bindgen::cairo_scaled_font_destroy;
 
-    // FIXME: font should be accessible from TextRun
-    let font = ctx.font_cache.get_test_font();
+    let font = run.font;
 
     let nfont: AzNativeFont = {
         mType: AZ_NATIVE_FONT_CAIRO_FONT_FACE,

src/servo/layout/box.rs

@@ -20,6 +20,7 @@ use layout::context::LayoutContext;
 use layout::debug::BoxedDebugMethods;
 use layout::flow::FlowContext;
 use layout::text::TextBoxData;
+use servo_text::text_run;
 use servo_text::text_run::TextRun;
 use std::net::url::Url;
 use task::spawn;
@@ -331,7 +332,7 @@ impl RenderBox : RenderBoxMethods {
     * `origin` - Total offset from display list root flow to this box's owning flow
     * `list` - List to which items should be appended
     */
-    fn build_display_list(_builder: &dl::DisplayListBuilder, dirty: &Rect<au>, 
+    fn build_display_list(builder: &dl::DisplayListBuilder, dirty: &Rect<au>,
                           offset: &Point2D<au>, list: &dl::DisplayList) {
         if !self.d().position.intersects(dirty) {
             return;
@@ -345,7 +346,7 @@ impl RenderBox : RenderBoxMethods {
         match self {
             UnscannedTextBox(*) => fail ~"Shouldn't see unscanned boxes here.",
             TextBox(_,d) => {
-                list.push(~dl::Text(bounds, ~(copy *d.run), d.offset, d.length))
+                list.push(~dl::Text(bounds, text_run::serialize(builder.ctx.font_cache, d.run), d.offset, d.length))
             },
             // TODO: items for background, border, outline
             GenericBox(_) => {

src/servo/layout/inline.rs

@@ -161,7 +161,7 @@ impl TextRunScanner {
                 let compression = CompressWhitespaceNewline;
                 let transformed_text = transform_text(text, compression);
                 // TODO(Issue #116): use actual font for corresponding DOM node to create text run.
-                let run = @TextRun(&*ctx.font_cache.get_test_font(), move transformed_text);
+                let run = @TextRun(ctx.font_cache.get_test_font(), move transformed_text);
                 let box_guts = TextBoxData(run, 0, run.text.len());
                 debug!("TextRunScanner: pushing single text box when start=%u,end=%u",
                        self.clump_start, self.clump_end);
@@ -214,7 +214,7 @@ impl TextRunScanner {
                 }
                 
                 // TODO(Issue #116): use actual font for corresponding DOM node to create text run.
-                let run = @TextRun(&*ctx.font_cache.get_test_font(), move run_str);
+                let run = @TextRun(ctx.font_cache.get_test_font(), move run_str);
                 let box_guts = TextBoxData(run, 0, run.text.len());
                 debug!("TextRunScanner: pushing box(es) when start=%u,end=%u",
                        self.clump_start, self.clump_end);

src/servo/text/font.rs

@@ -105,7 +105,6 @@ fn Font(lib: @FontCache, fontbuf: @~[u8], native_font: NativeFont) -> Font {
     }
 }
 
-// Most of these metrics are in terms of em. Use em_size to convert to au.
 struct FontMetrics {
     underline_size:   au,
     underline_offset: au,

src/servo/text/shaper.rs

@@ -52,12 +52,12 @@ fn fixed_to_rounded_int_hb(f: hb_position_t) -> int {
 Calculate the layout metrics associated with a some given text
 when rendered in a specific font.
 */
-pub fn shape_textrun(font: &Font, run: &TextRun) {
+pub fn shape_textrun(run: &TextRun) {
     debug!("shaping text '%s'", run.text);
 
     // TODO: harfbuzz fonts and faces should be cached on the Font object.
     // TODO: font tables should be stored in Font object and cached by FontCache (Issue #92)
-    let face_blob: *hb_blob_t = vec::as_imm_buf(*(*font).fontbuf, |buf: *u8, len: uint| {
+    let face_blob: *hb_blob_t = vec::as_imm_buf(*(run.font).fontbuf, |buf: *u8, len: uint| {
         hb_blob_create(buf as *c_char,
                        len as c_uint,
                        HB_MEMORY_MODE_READONLY,
@@ -79,7 +79,7 @@ pub fn shape_textrun(font: &Font, run: &TextRun) {
     hb_font_funcs_set_glyph_h_advance_func(funcs, glyph_h_advance_func, null(), null());
 
     unsafe {
-        let font_data: *c_void = cast::transmute(font);
+        let font_data: *c_void = core::ptr::addr_of(run.font) as *c_void;
         hb_font_set_funcs(hb_font, funcs, font_data, null());
     };
 
@@ -140,9 +140,8 @@ extern fn glyph_func(_font: *hb_font_t,
                      glyph: *mut hb_codepoint_t,
                      _user_data: *c_void) -> hb_bool_t unsafe {
 
-    let font: *Font = cast::transmute(font_data);
+    let font: *Font = font_data as *Font;
     assert font.is_not_null();
-
     return match (*font).glyph_index(unicode as char) {
         Some(g) => { *glyph = g as hb_codepoint_t; true },
         None => false
@@ -153,8 +152,9 @@ extern fn glyph_h_advance_func(_font: *hb_font_t,
                                font_data: *c_void,
                                glyph: hb_codepoint_t,
                                _user_data: *c_void) -> hb_position_t unsafe {
-    let font: *Font = cast::transmute(font_data);
+    let font: *Font = font_data as *Font;
     assert font.is_not_null();
+    debug!("font_data = %?", font_data);
 
     let advance = (*font).glyph_h_advance(glyph as GlyphIndex);
     float_to_fixed_hb(advance)

src/servo/text/text_run.rs

@@ -15,9 +15,36 @@ use std::arc;
 
 pub struct TextRun {
     text: ~str,
+    font: @Font,
     priv glyphs: GlyphStore,
 }
 
+// This is a hack until TextRuns are normally sendable, or
+// we instead use ARC<TextRun> everywhere.
+pub struct SendableTextRun {
+    text: ~str,
+    font_descriptor: (),
+    priv glyphs: GlyphStore,
+}
+
+pub fn serialize(_cache: @FontCache, run: &TextRun) -> ~SendableTextRun {
+    ~SendableTextRun {
+        text: copy run.text,
+        // TODO: actually serialize a font descriptor thingy
+        font_descriptor: (),
+        glyphs: copy run.glyphs,
+    }
+}
+
+pub fn deserialize(cache: @FontCache, run: &SendableTextRun) -> @TextRun {
+    @TextRun {
+        text: copy run.text,
+        // TODO: actually deserialize a font descriptor thingy
+        font: cache.get_test_font(),
+        glyphs: copy run.glyphs
+    }
+}
+
 trait TextRunMethods {
     pure fn glyphs(&self) -> &self/GlyphStore;
     pure fn iter_indivisible_pieces_for_range(&self, offset: uint, length: uint, f: fn(uint, uint) -> bool);
@@ -128,14 +155,15 @@ impl TextRun : TextRunMethods {
     }
 }
  
-fn TextRun(font: &Font, text: ~str) -> TextRun {
+fn TextRun(font: @Font, text: ~str) -> TextRun {
     let glyph_store = GlyphStore(text.len());
     let run = TextRun {
         text: text,
+        font: font,
         glyphs: glyph_store,
     };
 
-    shape_textrun(font, &run);
+    shape_textrun(&run);
     return run;
 }