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text: add metrics and dynamic height

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This commit is contained in:
Julian Orth 2022-07-30 16:16:35 +02:00
parent 2568b7b1f5
commit 8b93957f31
4 changed files with 84 additions and 28 deletions
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27
src/pango.rs
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@ -85,6 +85,7 @@ extern "C" {
ink_rect: *mut PangoRectangle,
logical_rect: *mut PangoRectangle,
);
fn pango_layout_get_baseline(layout: *mut PangoLayout_) -> c::c_int;
fn pango_extents_to_pixels(inclusive: *mut PangoRectangle, nearest: *mut PangoRectangle);
}
@ -104,6 +105,7 @@ pub enum PangoError {
}
#[repr(C)]
#[derive(Default)]
struct PangoRectangle {
x: c::c_int,
y: c::c_int,
@ -111,6 +113,8 @@ struct PangoRectangle {
height: c::c_int,
}
const PANGO_SCALE: i32 = 1024;
pub struct CairoImageSurface {
s: *mut cairo_surface_t,
}
@ -325,18 +329,29 @@ impl PangoLayout {
pub fn inc_pixel_rect(&self) -> Rect {
unsafe {
let mut rect = PangoRectangle {
x: 0,
y: 0,
width: 0,
height: 0,
};
let mut rect = PangoRectangle::default();
pango_layout_get_extents(self.l, &mut rect, ptr::null_mut());
pango_extents_to_pixels(&mut rect, ptr::null_mut());
Rect::new_sized(rect.x, rect.y, rect.width, rect.height).unwrap()
}
}
pub fn logical_pixel_rect(&self) -> Rect {
unsafe {
let mut rect = PangoRectangle::default();
pango_layout_get_extents(self.l, ptr::null_mut(), &mut rect);
pango_extents_to_pixels(&mut rect, ptr::null_mut());
Rect::new_sized(rect.x, rect.y, rect.width, rect.height).unwrap()
}
}
pub fn pixel_baseline(&self) -> i32 {
unsafe {
let res = pango_layout_get_baseline(self.l);
(res as i32 + PANGO_SCALE - 1) / PANGO_SCALE
}
}
pub fn show_layout(&self) {
unsafe {
pango_cairo_show_layout(self.c.c.c, self.l);