Implement vectorial text support for iced_tiny_skia

This commit is contained in:
Héctor Ramón Jiménez 2024-01-17 14:48:33 +01:00
parent dd032d9a7a
commit 4cb53a6e22
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GPG key ID: 7CC46565708259A7
3 changed files with 188 additions and 182 deletions

View file

@ -1,6 +1,8 @@
use crate::core::alignment; use crate::core::alignment;
use crate::core::text::{LineHeight, Shaping}; use crate::core::text::{LineHeight, Shaping};
use crate::core::{Color, Font, Pixels, Point}; use crate::core::{Color, Font, Pixels, Point, Size, Vector};
use crate::geometry::Path;
use crate::text;
/// A bunch of text that can be drawn to a canvas /// A bunch of text that can be drawn to a canvas
#[derive(Debug, Clone)] #[derive(Debug, Clone)]
@ -32,6 +34,137 @@ pub struct Text {
pub shaping: Shaping, pub shaping: Shaping,
} }
impl Text {
/// Computes the [`Path`]s of the [`Text`] and draws them using
/// the given closure.
pub fn draw_with(&self, mut f: impl FnMut(Path, Color)) {
let mut font_system =
text::font_system().write().expect("Write font system");
let mut buffer = cosmic_text::BufferLine::new(
&self.content,
cosmic_text::AttrsList::new(text::to_attributes(self.font)),
text::to_shaping(self.shaping),
);
let layout = buffer.layout(
font_system.raw(),
self.size.0,
f32::MAX,
cosmic_text::Wrap::None,
);
let translation_x = match self.horizontal_alignment {
alignment::Horizontal::Left => self.position.x,
alignment::Horizontal::Center | alignment::Horizontal::Right => {
let mut line_width = 0.0f32;
for line in layout.iter() {
line_width = line_width.max(line.w);
}
if self.horizontal_alignment == alignment::Horizontal::Center {
self.position.x - line_width / 2.0
} else {
self.position.x - line_width
}
}
};
let translation_y = {
let line_height = self.line_height.to_absolute(self.size);
match self.vertical_alignment {
alignment::Vertical::Top => self.position.y,
alignment::Vertical::Center => {
self.position.y - line_height.0 / 2.0
}
alignment::Vertical::Bottom => self.position.y - line_height.0,
}
};
let mut swash_cache = cosmic_text::SwashCache::new();
for run in layout.iter() {
for glyph in run.glyphs.iter() {
let physical_glyph = glyph.physical((0.0, 0.0), 1.0);
let start_x = translation_x + glyph.x + glyph.x_offset;
let start_y = translation_y + glyph.y_offset + self.size.0;
let offset = Vector::new(start_x, start_y);
if let Some(commands) = swash_cache.get_outline_commands(
font_system.raw(),
physical_glyph.cache_key,
) {
let glyph = Path::new(|path| {
use cosmic_text::Command;
for command in commands {
match command {
Command::MoveTo(p) => {
path.move_to(
Point::new(p.x, -p.y) + offset,
);
}
Command::LineTo(p) => {
path.line_to(
Point::new(p.x, -p.y) + offset,
);
}
Command::CurveTo(control_a, control_b, to) => {
path.bezier_curve_to(
Point::new(control_a.x, -control_a.y)
+ offset,
Point::new(control_b.x, -control_b.y)
+ offset,
Point::new(to.x, -to.y) + offset,
);
}
Command::QuadTo(control, to) => {
path.quadratic_curve_to(
Point::new(control.x, -control.y)
+ offset,
Point::new(to.x, -to.y) + offset,
);
}
Command::Close => {
path.close();
}
}
}
});
f(glyph, self.color);
} else {
// TODO: Raster image support for `Canvas`
let [r, g, b, a] = self.color.into_rgba8();
swash_cache.with_pixels(
font_system.raw(),
physical_glyph.cache_key,
cosmic_text::Color::rgba(r, g, b, a),
|x, y, color| {
f(
Path::rectangle(
Point::new(x as f32, y as f32) + offset,
Size::new(1.0, 1.0),
),
Color::from_rgba8(
color.r(),
color.g(),
color.b(),
color.a() as f32 / 255.0,
),
);
},
);
}
}
}
}
}
impl Default for Text { impl Default for Text {
fn default() -> Text { fn default() -> Text {
Text { Text {

View file

@ -97,54 +97,65 @@ impl Frame {
pub fn fill_text(&mut self, text: impl Into<Text>) { pub fn fill_text(&mut self, text: impl Into<Text>) {
let text = text.into(); let text = text.into();
let (position, size, line_height) = if self.transform.is_identity() { let (scale_x, scale_y) = self.transform.get_scale();
(text.position, text.size, text.line_height)
} else {
let mut position = [tiny_skia::Point {
x: text.position.x,
y: text.position.y,
}];
self.transform.map_points(&mut position); if self.transform.is_scale_translate()
&& scale_x == scale_y
&& scale_x > 0.0
&& scale_y > 0.0
{
let (position, size, line_height) = if self.transform.is_identity()
{
(text.position, text.size, text.line_height)
} else {
let mut position = [tiny_skia::Point {
x: text.position.x,
y: text.position.y,
}];
let (_, scale_y) = self.transform.get_scale(); self.transform.map_points(&mut position);
let size = text.size.0 * scale_y; let size = text.size.0 * scale_y;
let line_height = match text.line_height { let line_height = match text.line_height {
LineHeight::Absolute(size) => { LineHeight::Absolute(size) => {
LineHeight::Absolute(Pixels(size.0 * scale_y)) LineHeight::Absolute(Pixels(size.0 * scale_y))
} }
LineHeight::Relative(factor) => LineHeight::Relative(factor), LineHeight::Relative(factor) => {
LineHeight::Relative(factor)
}
};
(
Point::new(position[0].x, position[0].y),
size.into(),
line_height,
)
}; };
( let bounds = Rectangle {
Point::new(position[0].x, position[0].y), x: position.x,
size.into(), y: position.y,
width: f32::INFINITY,
height: f32::INFINITY,
};
// TODO: Honor layering!
self.primitives.push(Primitive::Text {
content: text.content,
bounds,
color: text.color,
size,
line_height, line_height,
) font: text.font,
}; horizontal_alignment: text.horizontal_alignment,
vertical_alignment: text.vertical_alignment,
let bounds = Rectangle { shaping: text.shaping,
x: position.x, clip_bounds: Rectangle::with_size(Size::INFINITY),
y: position.y, });
width: f32::INFINITY, } else {
height: f32::INFINITY, text.draw_with(|path, color| self.fill(&path, color));
}; }
// TODO: Use vectorial text instead of primitive
self.primitives.push(Primitive::Text {
content: text.content,
bounds,
color: text.color,
size,
line_height,
font: text.font,
horizontal_alignment: text.horizontal_alignment,
vertical_alignment: text.vertical_alignment,
shaping: text.shaping,
clip_bounds: Rectangle::with_size(Size::INFINITY),
});
} }
pub fn push_transform(&mut self) { pub fn push_transform(&mut self) {

View file

@ -1,7 +1,6 @@
//! Build and draw geometry. //! Build and draw geometry.
use crate::core::alignment;
use crate::core::text::LineHeight; use crate::core::text::LineHeight;
use crate::core::{Color, Pixels, Point, Rectangle, Size, Vector}; use crate::core::{Pixels, Point, Rectangle, Size, Vector};
use crate::graphics::color; use crate::graphics::color;
use crate::graphics::geometry::fill::{self, Fill}; use crate::graphics::geometry::fill::{self, Fill};
use crate::graphics::geometry::{ use crate::graphics::geometry::{
@ -9,7 +8,6 @@ use crate::graphics::geometry::{
}; };
use crate::graphics::gradient::{self, Gradient}; use crate::graphics::gradient::{self, Gradient};
use crate::graphics::mesh::{self, Mesh}; use crate::graphics::mesh::{self, Mesh};
use crate::graphics::text::{self, cosmic_text};
use crate::primitive::{self, Primitive}; use crate::primitive::{self, Primitive};
use lyon::geom::euclid; use lyon::geom::euclid;
@ -380,143 +378,7 @@ impl Frame {
clip_bounds: Rectangle::with_size(Size::INFINITY), clip_bounds: Rectangle::with_size(Size::INFINITY),
}); });
} else { } else {
let mut font_system = text.draw_with(|path, color| self.fill(&path, color));
text::font_system().write().expect("Write font system");
let mut buffer = cosmic_text::BufferLine::new(
&text.content,
cosmic_text::AttrsList::new(text::to_attributes(text.font)),
text::to_shaping(text.shaping),
);
let layout = buffer.layout(
font_system.raw(),
text.size.0,
f32::MAX,
cosmic_text::Wrap::None,
);
let translation_x = match text.horizontal_alignment {
alignment::Horizontal::Left => text.position.x,
alignment::Horizontal::Center
| alignment::Horizontal::Right => {
let mut line_width = 0.0f32;
for line in layout.iter() {
line_width = line_width.max(line.w);
}
if text.horizontal_alignment
== alignment::Horizontal::Center
{
text.position.x - line_width / 2.0
} else {
text.position.x - line_width
}
}
};
let translation_y = {
let line_height = text.line_height.to_absolute(text.size);
match text.vertical_alignment {
alignment::Vertical::Top => text.position.y,
alignment::Vertical::Center => {
text.position.y - line_height.0 / 2.0
}
alignment::Vertical::Bottom => {
text.position.y - line_height.0
}
}
};
let mut swash_cache = cosmic_text::SwashCache::new();
for run in layout.iter() {
for glyph in run.glyphs.iter() {
let physical_glyph = glyph.physical((0.0, 0.0), 1.0);
let start_x = translation_x + glyph.x + glyph.x_offset;
let start_y = translation_y + glyph.y_offset + text.size.0;
let offset = Vector::new(start_x, start_y);
if let Some(commands) = swash_cache.get_outline_commands(
font_system.raw(),
physical_glyph.cache_key,
) {
let glyph = Path::new(|path| {
use cosmic_text::Command;
for command in commands {
match command {
Command::MoveTo(p) => {
path.move_to(
Point::new(p.x, -p.y) + offset,
);
}
Command::LineTo(p) => {
path.line_to(
Point::new(p.x, -p.y) + offset,
);
}
Command::CurveTo(
control_a,
control_b,
to,
) => {
path.bezier_curve_to(
Point::new(
control_a.x,
-control_a.y,
) + offset,
Point::new(
control_b.x,
-control_b.y,
) + offset,
Point::new(to.x, -to.y) + offset,
);
}
Command::QuadTo(control, to) => {
path.quadratic_curve_to(
Point::new(control.x, -control.y)
+ offset,
Point::new(to.x, -to.y) + offset,
);
}
Command::Close => {
path.close();
}
}
}
});
self.fill(&glyph, text.color);
} else {
// TODO: Raster image support for `Canvas`
let [r, g, b, a] = text.color.into_rgba8();
swash_cache.with_pixels(
font_system.raw(),
physical_glyph.cache_key,
cosmic_text::Color::rgba(r, g, b, a),
|x, y, color| {
self.fill(
&Path::rectangle(
Point::new(x as f32, y as f32) + offset,
Size::new(1.0, 1.0),
),
Color::from_rgba8(
color.r(),
color.g(),
color.b(),
color.a() as f32 / 255.0,
),
);
},
)
}
}
}
} }
} }