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#[cfg(not(feature = "std"))]
use alloc::collections::BTreeMap as Map;
#[cfg(not(feature = "std"))]
use alloc::vec::Vec;
#[cfg(feature = "std")]
use std::collections::HashMap as Map;
use swash::scale::{ScaleContext, image::Content};
use swash::scale::{Render, Source, StrikeWith};
use swash::zeno::{Format, Vector};
use crate::{CacheKey, Color, FontSystem};
pub use swash::zeno::Command;
pub use swash::scale::image::{Content as SwashContent, Image as SwashImage};
fn swash_image(font_system: &FontSystem, context: &mut ScaleContext, cache_key: CacheKey) -> Option<SwashImage> {
let font = match font_system.get_font(cache_key.font_id) {
Some(some) => some,
None => {
log::warn!("did not find font {:?}", cache_key.font_id);
return None;
},
};
let mut scaler = context
.builder(font.as_swash())
.size(cache_key.font_size as f32)
.hint(true)
.build();
let offset =
Vector::new(cache_key.x_bin.as_float(), cache_key.y_bin.as_float());
Render::new(&[
Source::ColorOutline(0),
Source::ColorBitmap(StrikeWith::BestFit),
Source::Outline,
])
.format(Format::Alpha)
.offset(offset)
.render(&mut scaler, cache_key.glyph_id)
}
fn swash_outline_commands(font_system: &FontSystem, context: &mut ScaleContext, cache_key: CacheKey) -> Option<Vec<swash::zeno::Command>> {
use swash::zeno::PathData as _;
let font = match font_system.get_font(cache_key.font_id) {
Some(some) => some,
None => {
log::warn!("did not find font {:?}", cache_key.font_id);
return None;
},
};
let mut scaler = context
.builder(font.as_swash())
.size(cache_key.font_size as f32)
.build();
let outline = scaler.scale_outline(cache_key.glyph_id).or_else(|| scaler.scale_color_outline(cache_key.glyph_id))?;
let path = outline.path();
Some(path.commands().collect())
}
pub struct SwashCache<'a> {
font_system: &'a FontSystem,
context: ScaleContext,
pub image_cache: Map<CacheKey, Option<SwashImage>>,
pub outline_command_cache: Map<CacheKey, Option<Vec<swash::zeno::Command>>>,
}
impl<'a> SwashCache<'a> {
pub fn new(font_system: &'a FontSystem) -> Self {
Self {
font_system,
context: ScaleContext::new(),
image_cache: Map::new(),
outline_command_cache: Map::new()
}
}
pub fn get_image_uncached(&mut self, cache_key: CacheKey) -> Option<SwashImage> {
swash_image(self.font_system, &mut self.context, cache_key)
}
pub fn get_image(&mut self, cache_key: CacheKey) -> &Option<SwashImage> {
self.image_cache.entry(cache_key).or_insert_with(|| {
swash_image(self.font_system, &mut self.context, cache_key)
})
}
pub fn get_outline_commands(&mut self, cache_key: CacheKey) -> Option<&[swash::zeno::Command]> {
self.outline_command_cache.entry(cache_key).or_insert_with(|| {
swash_outline_commands(self.font_system, &mut self.context, cache_key)
}).as_deref()
}
pub fn with_pixels<F: FnMut(i32, i32, Color)>(
&mut self,
cache_key: CacheKey,
base: Color,
mut f: F
) {
if let Some(image) = self.get_image(cache_key) {
let x = image.placement.left;
let y = -image.placement.top;
match image.content {
Content::Mask => {
let mut i = 0;
for off_y in 0..image.placement.height as i32 {
for off_x in 0..image.placement.width as i32 {
f(
x + off_x,
y + off_y,
Color(
((image.data[i] as u32) << 24) |
base.0 & 0xFF_FF_FF
)
);
i += 1;
}
}
}
Content::Color => {
let mut i = 0;
for off_y in 0..image.placement.height as i32 {
for off_x in 0..image.placement.width as i32 {
f(
x + off_x,
y + off_y,
Color::rgba(
image.data[i],
image.data[i + 1],
image.data[i + 2],
image.data[i + 3]
)
);
i += 4;
}
}
}
Content::SubpixelMask => {
log::warn!("TODO: SubpixelMask");
}
}
}
}
}