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/* 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/. */
/// Implementation of Quartz (CoreGraphics) fonts.
extern crate core_foundation;
extern crate core_graphics;
extern crate core_text;
use font::{FontHandleMethods, FontMetrics, FontTableMethods};
use font::FontTableTag;
use font::{FractionalPixel, SpecifiedFontStyle};
use servo_util::geometry::{Au, px_to_pt};
use servo_util::geometry;
use platform::macos::font_context::FontContextHandle;
use text::glyph::GlyphIndex;
use style::computed_values::font_weight;
use core_foundation::base::CFIndex;
use core_foundation::data::CFData;
use core_foundation::string::UniChar;
use core_graphics::data_provider::CGDataProvider;
use core_graphics::font::{CGFont, CGGlyph};
use core_graphics::geometry::CGRect;
use core_text::font::CTFont;
use core_text::font_descriptor::{SymbolicTraitAccessors, TraitAccessors};
use core_text::font_descriptor::{kCTFontDefaultOrientation};
use core_text;
use std::ptr;
pub struct FontTable {
data: CFData,
}
// Noncopyable.
impl Drop for FontTable {
fn drop(&mut self) {}
}
impl FontTable {
pub fn wrap(data: CFData) -> FontTable {
FontTable { data: data }
}
}
impl FontTableMethods for FontTable {
fn with_buffer(&self, blk: |*u8, uint|) {
blk(self.data.bytes().as_ptr(), self.data.len() as uint);
}
}
pub struct FontHandle {
cgfont: Option<CGFont>,
pub ctfont: CTFont,
}
impl FontHandle {
pub fn new_from_CTFont(_: &FontContextHandle, ctfont: CTFont) -> Result<FontHandle, ()> {
Ok(FontHandle {
cgfont: None,
ctfont: ctfont,
})
}
pub fn get_CGFont(&mut self) -> CGFont {
match self.cgfont {
Some(ref font) => font.clone(),
None => {
let cgfont = self.ctfont.copy_to_CGFont();
self.cgfont = Some(cgfont.clone());
cgfont
}
}
}
}
impl FontHandleMethods for FontHandle {
fn new_from_buffer(_: &FontContextHandle, buf: ~[u8], style: &SpecifiedFontStyle)
-> Result<FontHandle, ()> {
let fontprov = CGDataProvider::from_buffer(buf);
let cgfont = CGFont::from_data_provider(fontprov);
let ctfont = core_text::font::new_from_CGFont(&cgfont, style.pt_size);
let result = Ok(FontHandle {
cgfont: Some(cgfont),
ctfont: ctfont,
});
return result;
}
fn family_name(&self) -> ~str {
self.ctfont.family_name()
}
fn face_name(&self) -> ~str {
self.ctfont.face_name()
}
fn is_italic(&self) -> bool {
self.ctfont.symbolic_traits().is_italic()
}
fn boldness(&self) -> font_weight::T {
// -1.0 to 1.0
let normalized = self.ctfont.all_traits().normalized_weight();
// 0.0 to 9.0
let normalized = (normalized + 1.0) / 2.0 * 9.0;
if normalized < 1.0 { return font_weight::Weight100; }
if normalized < 2.0 { return font_weight::Weight200; }
if normalized < 3.0 { return font_weight::Weight300; }
if normalized < 4.0 { return font_weight::Weight400; }
if normalized < 5.0 { return font_weight::Weight500; }
if normalized < 6.0 { return font_weight::Weight600; }
if normalized < 7.0 { return font_weight::Weight700; }
if normalized < 8.0 { return font_weight::Weight800; }
return font_weight::Weight900;
}
fn clone_with_style(&self, fctx: &FontContextHandle, style: &SpecifiedFontStyle)
-> Result<FontHandle,()> {
let new_font = self.ctfont.clone_with_font_size(style.pt_size);
return FontHandle::new_from_CTFont(fctx, new_font);
}
fn glyph_index(&self, codepoint: char) -> Option<GlyphIndex> {
let characters: [UniChar, ..1] = [codepoint as UniChar];
let glyphs: [CGGlyph, ..1] = [0 as CGGlyph];
let count: CFIndex = 1;
let result = self.ctfont.get_glyphs_for_characters(&characters[0],
&glyphs[0],
count);
if !result {
// No glyph for this character
return None;
}
assert!(glyphs[0] != 0); // FIXME: error handling
return Some(glyphs[0] as GlyphIndex);
}
fn glyph_h_advance(&self, glyph: GlyphIndex) -> Option<FractionalPixel> {
let glyphs = [glyph as CGGlyph];
let advance = self.ctfont.get_advances_for_glyphs(kCTFontDefaultOrientation,
&glyphs[0],
ptr::null(),
1);
Some(advance as FractionalPixel)
}
fn get_metrics(&self) -> FontMetrics {
let bounding_rect: CGRect = self.ctfont.bounding_box();
let ascent = Au::from_pt(self.ctfont.ascent() as f64);
let descent = Au::from_pt(self.ctfont.descent() as f64);
let em_size = Au::from_frac_px(self.ctfont.pt_size() as f64);
let scale = px_to_pt(self.ctfont.pt_size() as f64) / (self.ctfont.ascent() as f64 + self.ctfont.descent() as f64);
let metrics = FontMetrics {
underline_size: Au::from_pt(self.ctfont.underline_thickness() as f64),
// TODO(Issue #201): underline metrics are not reliable. Have to pull out of font table
// directly.
//
// see also: https://bugs.webkit.org/show_bug.cgi?id=16768
// see also: https://bugreports.qt-project.org/browse/QTBUG-13364
underline_offset: Au::from_pt(self.ctfont.underline_position() as f64),
strikeout_size: geometry::from_pt(0.0), // FIXME(Issue #942)
strikeout_offset: geometry::from_pt(0.0), // FIXME(Issue #942)
leading: Au::from_pt(self.ctfont.leading() as f64),
x_height: Au::from_pt(self.ctfont.x_height() as f64),
em_size: em_size,
ascent: ascent.scale_by(scale),
descent: descent.scale_by(scale),
max_advance: Au::from_pt(bounding_rect.size.width as f64)
};
debug!("Font metrics (@{:f} pt): {:?}", self.ctfont.pt_size() as f64, metrics);
return metrics;
}
fn get_table_for_tag(&self, tag: FontTableTag) -> Option<FontTable> {
let result: Option<CFData> = self.ctfont.get_font_table(tag);
result.and_then(|data| {
Some(FontTable::wrap(data))
})
}
fn face_identifier(&self) -> ~str {
self.ctfont.postscript_name()
}
}
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