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gfx: Implement letter-spacing
per CSS 2.1 § 16.4.
The ligature disabling code has been manually verified, but I was unable to reftest it. (The only way I could think of would be to create an Ahem-like font with a ligature table, but that would be an awful lot of work.) Near as I can tell, the method used to apply the spacing (manually inserting extra advance post-shaping) matches Gecko.
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758d79fff4
commit
07bc97e3e2
11 changed files with 246 additions and 47 deletions
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@ -2,15 +2,15 @@
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use font::{Font, RunMetrics, FontMetrics};
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use font::{Font, FontHandleMethods, FontMetrics, IS_WHITESPACE_SHAPING_FLAG, RunMetrics};
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use font::{ShapingOptions};
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use platform::font_template::FontTemplateData;
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use servo_util::geometry::Au;
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use servo_util::range::Range;
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use servo_util::vec::{Comparator, FullBinarySearchMethods};
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use std::slice::Items;
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use sync::Arc;
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use text::glyph::{CharIndex, GlyphStore};
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use font::FontHandleMethods;
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use platform::font_template::FontTemplateData;
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/// A single "paragraph" of text in one font size and style.
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#[deriving(Clone)]
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@ -117,8 +117,8 @@ impl<'a> Iterator<Range<CharIndex>> for LineIterator<'a> {
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}
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impl<'a> TextRun {
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pub fn new(font: &mut Font, text: String) -> TextRun {
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let glyphs = TextRun::break_and_shape(font, text.as_slice());
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pub fn new(font: &mut Font, text: String, options: &ShapingOptions) -> TextRun {
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let glyphs = TextRun::break_and_shape(font, text.as_slice(), options);
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let run = TextRun {
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text: Arc::new(text),
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font_metrics: font.metrics.clone(),
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@ -129,7 +129,8 @@ impl<'a> TextRun {
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return run;
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}
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pub fn break_and_shape(font: &mut Font, text: &str) -> Vec<GlyphRun> {
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pub fn break_and_shape(font: &mut Font, text: &str, options: &ShapingOptions)
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-> Vec<GlyphRun> {
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// TODO(Issue #230): do a better job. See Gecko's LineBreaker.
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let mut glyphs = vec!();
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let (mut byte_i, mut char_i) = (0u, CharIndex(0));
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@ -165,8 +166,14 @@ impl<'a> TextRun {
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let slice = text.slice(byte_last_boundary, byte_i);
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debug!("creating glyph store for slice {} (ws? {}), {} - {} in run {}",
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slice, !cur_slice_is_whitespace, byte_last_boundary, byte_i, text);
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let mut options = *options;
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if !cur_slice_is_whitespace {
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options.flags.insert(IS_WHITESPACE_SHAPING_FLAG);
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}
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glyphs.push(GlyphRun {
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glyph_store: font.shape_text(slice, !cur_slice_is_whitespace),
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glyph_store: font.shape_text(slice, &options),
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range: Range::new(char_last_boundary, char_i - char_last_boundary),
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});
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byte_last_boundary = byte_i;
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@ -182,8 +189,14 @@ impl<'a> TextRun {
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let slice = text.slice_from(byte_last_boundary);
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debug!("creating glyph store for final slice {} (ws? {}), {} - {} in run {}",
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slice, cur_slice_is_whitespace, byte_last_boundary, text.len(), text);
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let mut options = *options;
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if cur_slice_is_whitespace {
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options.flags.insert(IS_WHITESPACE_SHAPING_FLAG);
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}
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glyphs.push(GlyphRun {
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glyph_store: font.shape_text(slice, cur_slice_is_whitespace),
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glyph_store: font.shape_text(slice, &options),
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range: Range::new(char_last_boundary, char_i - char_last_boundary),
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});
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}
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