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|
mod font;
use crate::Transformation;
use std::cell::RefCell;
use std::collections::HashMap;
pub struct Pipeline {
draw_brush: RefCell<wgpu_glyph::GlyphBrush<'static, ()>>,
draw_font_map: RefCell<HashMap<String, wgpu_glyph::FontId>>,
measure_brush: RefCell<glyph_brush::GlyphBrush<'static, ()>>,
}
impl Pipeline {
pub fn new(device: &mut wgpu::Device) -> Self {
// TODO: Font customization
let font_source = font::Source::new();
let default_font = font_source
.load(&[font::Family::SansSerif, font::Family::Serif])
.expect("Find sans-serif or serif font");
let mono_font = font_source
.load(&[font::Family::Monospace])
.expect("Find monospace font");
let draw_brush =
wgpu_glyph::GlyphBrushBuilder::using_fonts_bytes(vec![
mono_font,
default_font.clone(),
])
.initial_cache_size((2048, 2048))
.build(device, wgpu::TextureFormat::Bgra8UnormSrgb);
let measure_brush =
glyph_brush::GlyphBrushBuilder::using_font_bytes(default_font)
.build();
Pipeline {
draw_brush: RefCell::new(draw_brush),
draw_font_map: RefCell::new(HashMap::new()),
measure_brush: RefCell::new(measure_brush),
}
}
pub fn overlay_font(&self) -> wgpu_glyph::FontId {
wgpu_glyph::FontId(0)
}
pub fn queue(&mut self, section: wgpu_glyph::Section) {
self.draw_brush.borrow_mut().queue(section);
}
pub fn draw_queued(
&mut self,
device: &mut wgpu::Device,
encoder: &mut wgpu::CommandEncoder,
target: &wgpu::TextureView,
transformation: Transformation,
region: wgpu_glyph::Region,
) {
self.draw_brush
.borrow_mut()
.draw_queued_with_transform_and_scissoring(
device,
encoder,
target,
transformation.into(),
region,
)
.expect("Draw text");
}
pub fn measure(
&self,
content: &str,
size: f32,
font: iced_native::Font,
bounds: iced_native::Size,
) -> (f32, f32) {
use wgpu_glyph::GlyphCruncher;
let wgpu_glyph::FontId(font_id) = self.find_font(font);
let section = wgpu_glyph::Section {
text: content,
scale: wgpu_glyph::Scale { x: size, y: size },
bounds: (bounds.width, bounds.height),
// TODO: This is a bit hacky. We are loading the debug font as the
// first font in the `draw_brush`. The `measure_brush` does not
// contain this font.
//
// This should go away once we improve the debug view and integrate
// it as just another UI app.
font_id: wgpu_glyph::FontId(font_id - 1),
..Default::default()
};
if let Some(bounds) =
self.measure_brush.borrow_mut().glyph_bounds(section)
{
(bounds.width().ceil(), bounds.height().ceil())
} else {
(0.0, 0.0)
}
}
pub fn space_width(&self, size: f32) -> f32 {
use wgpu_glyph::GlyphCruncher;
let glyph_brush = self.measure_brush.borrow();
// TODO: Select appropriate font
let font = &glyph_brush.fonts()[0];
font.glyph(' ')
.scaled(wgpu_glyph::Scale { x: size, y: size })
.h_metrics()
.advance_width
}
pub fn clear_measurement_cache(&mut self) {
// TODO: We should probably use a `GlyphCalculator` for this. However,
// it uses a lifetimed `GlyphCalculatorGuard` with side-effects on drop.
// This makes stuff quite inconvenient. A manual method for trimming the
// cache would make our lives easier.
self.measure_brush
.borrow_mut()
.process_queued(|_, _| {}, |_| {})
.expect("Trim text measurements");
}
pub fn find_font(&self, font: iced_native::Font) -> wgpu_glyph::FontId {
match font {
iced_native::Font::Default => wgpu_glyph::FontId(1),
iced_native::Font::External { name, bytes } => {
if let Some(font_id) = self.draw_font_map.borrow().get(name) {
return *font_id;
}
// TODO: Find a way to share font data
let _ = self.measure_brush.borrow_mut().add_font_bytes(bytes);
let font_id =
self.draw_brush.borrow_mut().add_font_bytes(bytes);
self.draw_font_map
.borrow_mut()
.insert(String::from(name), font_id);
font_id
}
}
}
}
|
