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Precalculate the size of TextRuns

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Brian Anderson 2012-09-13 19:37:57 -07:00
parent a475304754
commit 8bce1b60ed
1 changed files with 20 additions and 13 deletions
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33
src/servo/text/text_run.rs
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@ -9,29 +9,36 @@ use shaper::shape_text;
#[doc="A single, unbroken line of text."] #[doc="A single, unbroken line of text."]
struct TextRun { struct TextRun {
glyphs: ~[Glyph], priv glyphs: ~[Glyph],
priv size_: Size2D<au>,
} }
impl TextRun { impl TextRun {
fn size() -> Size2D<au> { fn size() -> Size2D<au> { self.size_ }
let height = px_to_au(20);
let pen_start_x = px_to_au(0);
let pen_start_y = height;
let pen_start = Point2D(pen_start_x, pen_start_y);
let pen_end = self.glyphs.foldl(pen_start, |cur, glyph| {
Point2D(cur.x.add(glyph.pos.offset.x).add(glyph.pos.advance.x),
cur.y.add(glyph.pos.offset.y).add(glyph.pos.advance.y))
});
return Size2D(pen_end.x, pen_end.y);
}
} }
fn TextRun(font: Font, text: ~str) -> TextRun { fn TextRun(font: Font, text: ~str) -> TextRun {
let glyphs = shape_text(&font, text);
let size = glyph_run_size(glyphs);
TextRun { TextRun {
glyphs : shape_text(&font, text) size_: size,
glyphs: shape_text(&font, text)
} }
} }
fn glyph_run_size(glyphs: &[Glyph]) -> Size2D<au> {
let height = px_to_au(20);
let pen_start_x = px_to_au(0);
let pen_start_y = height;
let pen_start = Point2D(pen_start_x, pen_start_y);
let pen_end = glyphs.foldl(pen_start, |cur, glyph| {
Point2D(cur.x.add(glyph.pos.offset.x).add(glyph.pos.advance.x),
cur.y.add(glyph.pos.offset.y).add(glyph.pos.advance.y))
});
return Size2D(pen_end.x, pen_end.y);
}
fn should_calculate_the_total_size() { fn should_calculate_the_total_size() {
#[test]; #[test];
#[ignore(cfg(target_os = "macos"))]; #[ignore(cfg(target_os = "macos"))];