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use super::hb_font_t;
use super::ot_shape::{hb_ot_shape_context_t, shape_internal};
use super::ot_shape_plan::hb_ot_shape_plan_t;
use crate::{script, Feature, GlyphBuffer, UnicodeBuffer};
/// Shapes the buffer content using provided font and features.
///
/// Consumes the buffer. You can then run [`GlyphBuffer::clear`] to get the [`UnicodeBuffer`] back
/// without allocating a new one.
///
/// If you plan to shape multiple strings using the same [`Face`] prefer [`shape_with_plan`].
/// This is because [`ShapePlan`] initialization is pretty slow and should preferably be called
/// once for each [`Face`].
pub fn shape(face: &hb_font_t, features: &[Feature], mut buffer: UnicodeBuffer) -> GlyphBuffer {
buffer.0.guess_segment_properties();
let plan = hb_ot_shape_plan_t::new(
face,
buffer.0.direction,
buffer.0.script,
buffer.0.language.as_ref(),
features,
);
shape_with_plan(face, &plan, buffer)
}
/// Shapes the buffer content using the provided font and plan.
///
/// Consumes the buffer. You can then run [`GlyphBuffer::clear`] to get the [`UnicodeBuffer`] back
/// without allocating a new one.
///
/// It is up to the caller to ensure that the shape plan matches the properties of the provided
/// buffer, otherwise the shaping result will likely be incorrect.
///
/// # Panics
///
/// Will panic when debugging assertions are enabled if the buffer and plan have mismatched
/// properties.
pub fn shape_with_plan(
face: &hb_font_t,
plan: &hb_ot_shape_plan_t,
buffer: UnicodeBuffer,
) -> GlyphBuffer {
let mut buffer = buffer.0;
buffer.guess_segment_properties();
buffer.enter();
debug_assert_eq!(buffer.direction, plan.direction);
debug_assert_eq!(
buffer.script.unwrap_or(script::UNKNOWN),
plan.script.unwrap_or(script::UNKNOWN)
);
if buffer.len > 0 {
// Save the original direction, we use it later.
let target_direction = buffer.direction;
#[cfg(feature = "wasm-shaper")]
{
super::shape_wasm::shape_with_wasm(face, plan, &mut buffer).unwrap_or_else(|| {
shape_internal(&mut hb_ot_shape_context_t {
plan,
face,
buffer: &mut buffer,
target_direction,
});
});
}
#[cfg(not(feature = "wasm-shaper"))]
{
shape_internal(&mut hb_ot_shape_context_t {
plan,
face,
buffer: &mut buffer,
target_direction,
});
}
}
GlyphBuffer(buffer)
}