Mirrors/servo
1
0
Fork 0
mirror of https://github.com/servo/servo.git synced 2025-06-06 16:45:39 +00:00
Code Issues Projects Releases Packages Wiki Activity

enhance: Implement CanvasRenderingContext2D.measureText (#32704)

Browse source 
Signed-off-by: Chocolate Pie <106949016+chocolate-pie@users.noreply.github.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Chocolate Pie 2024-07-18 04:20:18 +09:00 • committed by GitHub
parent d82232d549
commit 1223335547
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
14 changed files with 325 additions and 51 deletions
Download patch file Download diff file Expand all files Collapse all files

55
components/fonts/shaper.rs
View file

@ -19,20 +19,24 @@ use harfbuzz_sys::{
hb_face_create_for_tables, hb_face_destroy, hb_face_t, hb_feature_t, hb_font_create,
hb_font_destroy, hb_font_funcs_create, hb_font_funcs_set_glyph_h_advance_func,
hb_font_funcs_set_nominal_glyph_func, hb_font_funcs_t, hb_font_set_funcs, hb_font_set_ppem,
hb_font_set_scale, hb_font_t, hb_glyph_info_t, hb_glyph_position_t, hb_position_t, hb_shape,
hb_tag_t, HB_DIRECTION_LTR, HB_DIRECTION_RTL, HB_MEMORY_MODE_READONLY,
hb_font_set_scale, hb_font_t, hb_glyph_info_t, hb_glyph_position_t, hb_ot_layout_get_baseline,
hb_position_t, hb_shape, hb_tag_t, HB_DIRECTION_LTR, HB_DIRECTION_RTL, HB_MEMORY_MODE_READONLY,
HB_OT_LAYOUT_BASELINE_TAG_HANGING, HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_BOTTOM_OR_LEFT,
HB_OT_LAYOUT_BASELINE_TAG_ROMAN,
};
use lazy_static::lazy_static;
use log::debug;
use crate::platform::font::FontTable;
use crate::{
fixed_to_float, float_to_fixed, ot_tag, ByteIndex, Font, FontTableMethods, FontTableTag,
GlyphData, GlyphId, GlyphStore, ShapingFlags, ShapingOptions, KERN,
fixed_to_float, float_to_fixed, ot_tag, ByteIndex, Font, FontBaseline, FontTableMethods,
FontTableTag, GlyphData, GlyphId, GlyphStore, ShapingFlags, ShapingOptions, BASE, KERN,
};
const NO_GLYPH: i32 = -1;
const LIGA: u32 = ot_tag!('l', 'i', 'g', 'a');
const HB_OT_TAG_DEFAULT_SCRIPT: u32 = ot_tag!('D', 'F', 'L', 'T');
const HB_OT_TAG_DEFAULT_LANGUAGE: u32 = ot_tag!('d', 'f', 'l', 't');
pub struct ShapedGlyphData {
count: usize,
@ -606,6 +610,49 @@ impl Shaper {
advance
}
pub unsafe fn get_baseline(&self) -> Option<FontBaseline> {
if (*self.font).table_for_tag(BASE).is_none() {
return None;
}
let mut hanging_baseline = 0;
let mut alphabetic_baseline = 0;
let mut ideographic_baseline = 0;
hb_ot_layout_get_baseline(
self.hb_font,
HB_OT_LAYOUT_BASELINE_TAG_ROMAN,
HB_DIRECTION_LTR,
HB_OT_TAG_DEFAULT_SCRIPT,
HB_OT_TAG_DEFAULT_LANGUAGE,
&mut alphabetic_baseline as *mut _,
);
hb_ot_layout_get_baseline(
self.hb_font,
HB_OT_LAYOUT_BASELINE_TAG_HANGING,
HB_DIRECTION_LTR,
HB_OT_TAG_DEFAULT_SCRIPT,
HB_OT_TAG_DEFAULT_LANGUAGE,
&mut hanging_baseline as *mut _,
);
hb_ot_layout_get_baseline(
self.hb_font,
HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_BOTTOM_OR_LEFT,
HB_DIRECTION_LTR,
HB_OT_TAG_DEFAULT_SCRIPT,
HB_OT_TAG_DEFAULT_LANGUAGE,
&mut ideographic_baseline as *mut _,
);
Some(FontBaseline {
ideographic_baseline: Shaper::fixed_to_float(ideographic_baseline) as f32,
alphabetic_baseline: Shaper::fixed_to_float(alphabetic_baseline) as f32,
hanging_baseline: Shaper::fixed_to_float(hanging_baseline) as f32,
})
}
}
/// Callbacks from Harfbuzz when font map and glyph advance lookup needed.