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|
pub use iced_native::text::Hit;
use iced_graphics::layer::Text;
use iced_native::{Font, Rectangle, Size};
#[allow(missing_debug_implementations)]
pub struct Pipeline {
renderers: Vec<glyphon::TextRenderer>,
atlas: glyphon::TextAtlas,
cache: glyphon::SwashCache<'static>,
layer: usize,
}
// TODO: Share with `iced_graphics`
static FONT_SYSTEM: once_cell::sync::Lazy<glyphon::FontSystem> =
once_cell::sync::Lazy::new(glyphon::FontSystem::new);
impl Pipeline {
pub fn new(
device: &wgpu::Device,
queue: &wgpu::Queue,
format: wgpu::TextureFormat,
_default_font: Option<&[u8]>,
_multithreading: bool,
) -> Self {
Pipeline {
renderers: Vec::new(),
atlas: glyphon::TextAtlas::new(device, queue, format),
cache: glyphon::SwashCache::new(&FONT_SYSTEM),
layer: 0,
}
}
pub fn prepare(
&mut self,
device: &wgpu::Device,
queue: &wgpu::Queue,
sections: &[Text<'_>],
bounds: Rectangle,
scale_factor: f32,
target_size: Size<u32>,
) {
if self.renderers.len() <= self.layer {
self.renderers
.push(glyphon::TextRenderer::new(device, queue));
}
let renderer = &mut self.renderers[self.layer];
let buffers: Vec<_> = sections
.iter()
.map(|section| {
let metrics = glyphon::Metrics::new(
(section.size * scale_factor) as i32,
(section.size * 1.2 * scale_factor) as i32,
);
let mut buffer = glyphon::Buffer::new(&FONT_SYSTEM, metrics);
buffer.set_size(
(section.bounds.width * scale_factor).ceil() as i32,
(section.bounds.height * scale_factor).ceil() as i32,
);
buffer.set_text(
section.content,
glyphon::Attrs::new()
.color({
let [r, g, b, a] = section.color.into_rgba8();
glyphon::Color::rgba(r, g, b, a)
})
.family(match section.font {
Font::Default => glyphon::Family::SansSerif,
Font::External { name, .. } => {
glyphon::Family::Name(name)
}
}),
);
buffer.shape_until_scroll();
buffer
})
.collect();
let bounds = glyphon::TextBounds {
left: (bounds.x * scale_factor) as i32,
top: (bounds.y * scale_factor) as i32,
right: ((bounds.x + bounds.width) * scale_factor) as i32,
bottom: ((bounds.y + bounds.height) * scale_factor) as i32,
};
let text_areas: Vec<_> = sections
.iter()
.zip(buffers.iter())
.map(|(section, buffer)| glyphon::TextArea {
buffer,
left: (section.bounds.x * scale_factor) as i32,
top: (section.bounds.y * scale_factor) as i32,
bounds,
})
.collect();
renderer
.prepare(
device,
queue,
&mut self.atlas,
glyphon::Resolution {
width: target_size.width,
height: target_size.height,
},
&text_areas,
glyphon::Color::rgb(0, 0, 0),
&mut self.cache,
)
.expect("Prepare text sections");
}
pub fn render(
&mut self,
encoder: &mut wgpu::CommandEncoder,
target: &wgpu::TextureView,
) {
let mut render_pass =
encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
label: None,
color_attachments: &[Some(wgpu::RenderPassColorAttachment {
view: target,
resolve_target: None,
ops: wgpu::Operations {
load: wgpu::LoadOp::Load,
store: true,
},
})],
depth_stencil_attachment: None,
});
let renderer = &mut self.renderers[self.layer];
renderer
.render(&self.atlas, &mut render_pass)
.expect("Render text");
self.layer += 1;
}
pub fn end_frame(&mut self) {
self.renderers.truncate(self.layer);
self.layer = 0;
}
pub fn measure(
&self,
content: &str,
size: f32,
font: Font,
bounds: Size,
) -> (f32, f32) {
let attrs = match font {
Font::Default => glyphon::Attrs::new(),
Font::External { name, .. } => glyphon::Attrs {
family: glyphon::Family::Name(name),
..glyphon::Attrs::new()
},
};
let mut paragraph =
glyphon::BufferLine::new(content, glyphon::AttrsList::new(attrs));
// TODO: Cache layout
let layout = paragraph.layout(
&FONT_SYSTEM,
size as i32,
bounds.width as i32,
glyphon::Wrap::Word,
);
(
layout.iter().fold(0.0, |max, line| line.w.max(max)),
size * 1.2 * layout.len() as f32,
)
}
pub fn hit_test(
&self,
_content: &str,
_size: f32,
_font: iced_native::Font,
_bounds: iced_native::Size,
_point: iced_native::Point,
_nearest_only: bool,
) -> Option<Hit> {
None
}
pub fn trim_measurement_cache(&mut self) {}
}
|
