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fonts: move ft size computation into lower layer

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This allows it to be shared between separated ft and harfbuzz code
This commit is contained in:
Wez Furlong 2019-12-09 08:00:55 -08:00
parent 17101b182e
commit 5891277d1f
2 changed files with 46 additions and 38 deletions
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39
src/font/ftfont.rs
View File

@ -24,44 +24,7 @@ impl FreeTypeFontImpl {
size: f64,
dpi: u32,
) -> Result<Self, Error> {
debug!("set_char_size {} dpi={}", size, dpi);
// Scaling before truncating to integer minimizes the chances of hitting
// the fallback code for set_pixel_sizes below.
let size = (size * 64.0) as ftwrap::FT_F26Dot6;
let (cell_width, cell_height) = match face.set_char_size(size, size, dpi, dpi) {
Ok(_) => {
// Compute metrics for the nominal monospace cell
face.cell_metrics()
}
Err(err) => {
let sizes = unsafe {
let rec = &(*face.face);
slice::from_raw_parts(rec.available_sizes, rec.num_fixed_sizes as usize)
};
if sizes.is_empty() {
return Err(err);
}
// Find the best matching size.
// We just take the biggest.
let mut best = 0;
let mut best_size = 0;
let mut cell_width = 0;
let mut cell_height = 0;
for (idx, info) in sizes.iter().enumerate() {
let size = best_size.max(info.height);
if size > best_size {
best = idx;
best_size = size;
cell_width = info.width;
cell_height = info.height;
}
}
face.select_size(best)?;
(f64::from(cell_width), f64::from(cell_height))
}
};
let (cell_width, cell_height) = face.set_font_size(size, dpi)?;
debug!("metrics: width={} height={}", cell_width, cell_height);
let font = harfbuzz::Font::new(face.face);

45
src/font/ftwrap.rs
View File

@ -33,6 +33,51 @@ impl Drop for Face {
}
impl Face {
/// This is a wrapper around set_char_size and select_size
/// that accounts for some weirdness with eg: color emoji
pub fn set_font_size(&mut self, size: f64, dpi: u32) -> Fallible<(f64, f64)> {
log::debug!("set_char_size {} dpi={}", size, dpi);
// Scaling before truncating to integer minimizes the chances of hitting
// the fallback code for set_pixel_sizes below.
let size = (size * 64.0) as FT_F26Dot6;
let (cell_width, cell_height) = match self.set_char_size(size, size, dpi, dpi) {
Ok(_) => {
// Compute metrics for the nominal monospace cell
self.cell_metrics()
}
Err(err) => {
let sizes = unsafe {
let rec = &(*self.face);
std::slice::from_raw_parts(rec.available_sizes, rec.num_fixed_sizes as usize)
};
if sizes.is_empty() {
return Err(err);
}
// Find the best matching size.
// We just take the biggest.
let mut best = 0;
let mut best_size = 0;
let mut cell_width = 0;
let mut cell_height = 0;
for (idx, info) in sizes.iter().enumerate() {
let size = best_size.max(info.height);
if size > best_size {
best = idx;
best_size = size;
cell_width = info.width;
cell_height = info.height;
}
}
self.select_size(best)?;
(f64::from(cell_width), f64::from(cell_height))
}
};
Ok((cell_width, cell_height))
}
pub fn set_char_size(
&mut self,
char_width: FT_F26Dot6,