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[fontations] Implement sweep gradients

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Untested. Also, radial gradients seem faulty.
This commit is contained in:
Behdad Esfahbod 2025-03-05 00:39:55 -07:00 • committed by Khaled Hosny
parent 865d75ef30
commit e10e5c3764
1 changed files with 51 additions and 18 deletions
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69
src/fontations/lib.rs
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@ -10,7 +10,9 @@ use read_fonts::tables::cpal::ColorRecord;
use read_fonts::TableProvider;
use skrifa::charmap::Charmap;
use skrifa::charmap::MapVariant::Variant;
use skrifa::color::{Brush, ColorGlyphCollection, ColorPainter, ColorStop, CompositeMode, Extend, Transform};
use skrifa::color::{
Brush, ColorGlyphCollection, ColorPainter, ColorStop, CompositeMode, Extend, Transform,
};
use skrifa::font::FontRef;
use skrifa::instance::{Location, NormalizedCoord, Size};
use skrifa::metrics::BoundingBox;
@ -345,13 +347,15 @@ impl HbColorPainter {
}
}
fn make_color_line(&mut self, color_stops : &ColorLineData) -> hb_color_line_t {
fn make_color_line(&mut self, color_stops: &ColorLineData) -> hb_color_line_t {
let mut cl = unsafe { std::mem::zeroed::<hb_color_line_t>() };
cl.data = self as *mut HbColorPainter as *mut ::std::os::raw::c_void;
cl.get_color_stops = Some(_hb_fontations_get_color_stops);
cl.get_color_stops_user_data = color_stops as *const ColorLineData as *mut ::std::os::raw::c_void;
cl.get_color_stops_user_data =
color_stops as *const ColorLineData as *mut ::std::os::raw::c_void;
cl.get_extend = Some(_hb_fontations_get_extend);
cl.get_extend_user_data = color_stops as *const ColorLineData as *mut ::std::os::raw::c_void;
cl.get_extend_user_data =
color_stops as *const ColorLineData as *mut ::std::os::raw::c_void;
cl
}
}
@ -360,15 +364,14 @@ struct ColorLineData<'a> {
color_stops: &'a [ColorStop],
extend: Extend,
}
extern "C" fn _hb_fontations_get_color_stops (
extern "C" fn _hb_fontations_get_color_stops(
_color_line: *mut hb_color_line_t,
color_line_data: *mut ::std::os::raw::c_void,
start: ::std::os::raw::c_uint,
count_out: *mut ::std::os::raw::c_uint,
color_stops_out: *mut hb_color_stop_t,
user_data: *mut ::std::os::raw::c_void,
) -> ::std::os::raw::c_uint
{
) -> ::std::os::raw::c_uint {
let color_painter = unsafe { &*(color_line_data as *const HbColorPainter) };
let color_line_data = unsafe { &*(user_data as *const ColorLineData) };
let color_stops = &color_line_data.color_stops;
@ -379,26 +382,27 @@ extern "C" fn _hb_fontations_get_color_stops (
for i in 0..count {
let stop = color_stops.get(start as usize + i as usize);
if stop.is_none() {
unsafe { *count_out = i; };
unsafe {
*count_out = i;
};
return color_stops.len() as u32;
}
let stop = stop.unwrap();
unsafe {
*(color_stops_out.offset(i as isize)) = hb_color_stop_t {
offset: stop.offset,
color: color_painter.lookup_color(stop.palette_index, stop.alpha),
is_foreground: (stop.palette_index == 0xFFFF) as hb_bool_t,
};
offset: stop.offset,
color: color_painter.lookup_color(stop.palette_index, stop.alpha),
is_foreground: (stop.palette_index == 0xFFFF) as hb_bool_t,
};
}
}
return color_stops.len() as u32;
}
extern "C" fn _hb_fontations_get_extend (
extern "C" fn _hb_fontations_get_extend(
_color_line: *mut hb_color_line_t,
color_line_data: *mut ::std::os::raw::c_void,
_user_data: *mut ::std::os::raw::c_void,
) -> hb_paint_extend_t
{
) -> hb_paint_extend_t {
let color_line_data = unsafe { &*(color_line_data as *const ColorLineData) };
color_line_data.extend as hb_paint_extend_t // They are the same
}
@ -484,7 +488,10 @@ impl ColorPainter for HbColorPainter {
p0,
p1,
} => {
let color_stops = ColorLineData { color_stops: &color_stops, extend };
let color_stops = ColorLineData {
color_stops: &color_stops,
extend,
};
let mut color_line = self.make_color_line(&color_stops);
unsafe {
hb_paint_linear_gradient(
@ -508,7 +515,10 @@ impl ColorPainter for HbColorPainter {
c1,
r1,
} => {
let color_stops = ColorLineData { color_stops: &color_stops, extend };
let color_stops = ColorLineData {
color_stops: &color_stops,
extend,
};
let mut color_line = self.make_color_line(&color_stops);
unsafe {
hb_paint_radial_gradient(
@ -524,7 +534,30 @@ impl ColorPainter for HbColorPainter {
);
}
}
_ => {}
Brush::SweepGradient {
color_stops,
extend,
c0,
start_angle,
end_angle,
} => {
let color_stops = ColorLineData {
color_stops: &color_stops,
extend,
};
let mut color_line = self.make_color_line(&color_stops);
unsafe {
hb_paint_sweep_gradient(
self.paint_funcs,
self.paint_data,
&mut color_line,
c0.x,
c0.y,
start_angle,
end_angle,
);
}
}
}
}
fn push_layer(&mut self, mode: CompositeMode) {