servo: Make text_run immutable

Source-Repo: https://github.com/servo/servo
Source-Revision: 5af6c891ed30fcc8e0635ae8f7cc6bcf324d591a

servo/src/servo/layout/text.rs

@@ -4,6 +4,7 @@ import geom::size::Size2D;
 import gfx::geometry::au;
 import layout::base::*;     // FIXME: Can't get around import *; resolve bug.
 import servo_text::text_run::text_run;
+import servo_text::font::create_test_font;
 
 class text_box {
     let text: str;
@@ -23,12 +24,12 @@ impl text_layout_methods for @Box {
             _ { fail "expected text box in reflow_text!" }
         };
 
-        let run = text_run(copy subbox.text);
-        subbox.run = some(copy run);
-        run.shape();
+        let font = create_test_font();
+        let run = text_run(&font, subbox.text);
+        subbox.run = some(run);
 
         self.bounds.size =
-            Size2D(alt vec::last_opt(run.glyphs.get()) {
+            Size2D(alt vec::last_opt(run.glyphs) {
                         some(glyph) {
                             au(*glyph.pos.offset.x + *glyph.pos.advance.x)
                         }

servo/src/servo/text/text_run.rs

@@ -1,24 +1,14 @@
 import libc::{c_void};
-import text::glyph::glyph;
+import font::font;
+import glyph::glyph;
 import shaper::shape_text;
 
 #[doc="A single, unbroken line of text."]
 class text_run {
-    let text: str;
-    let mut glyphs: option<[glyph]>;
+    let glyphs: [glyph];
 
-    new(-text: str) {
-        self.text = text;
-        self.glyphs = none;
-    }
-
-    #[doc="
-        Shapes text. This determines the location of each glyph and determines
-        line break positions.
-    "]
-    fn shape() {
-        let font = font::create_test_font();
-        self.glyphs = some(shape_text(&font, self.text));
+    new(font: &font, text: str) {
+        self.glyphs = shape_text(font, text);
     }
 }