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Expose linear gradients to the C API #439

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Expose linear gradients to the C API #439

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29 changes: 29 additions & 0 deletions c/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ use pathfinder_color::{ColorF, ColorU};
use pathfinder_content::fill::FillRule;
use pathfinder_content::outline::ArcDirection;
use pathfinder_content::stroke::LineCap;
use pathfinder_content::gradient::{Gradient, ColorStop};
use pathfinder_geometry::rect::{RectF, RectI};
use pathfinder_geometry::transform2d::{Matrix2x2F, Transform2F};
use pathfinder_geometry::transform3d::{Perspective, Transform4F};
Expand Down Expand Up @@ -102,6 +103,7 @@ pub type FKHandleRef = *mut Handle;
pub type PFCanvasRef = *mut CanvasRenderingContext2D;
pub type PFPathRef = *mut Path2D;
pub type PFCanvasFontContextRef = *mut CanvasFontContext;
pub type PFGradientRef = *mut Gradient;
pub type PFFillStyleRef = *mut FillStyle;
pub type PFLineCap = u8;
pub type PFLineJoin = u8;
Expand All @@ -128,6 +130,11 @@ pub struct PFColorU {
pub b: u8,
pub a: u8,
}
#[repr(C)]
pub struct PFColorStop {
pub offset: f32,
pub color: PFColorU,
}

// `geometry`
#[repr(C)]
Expand Down Expand Up @@ -524,6 +531,21 @@ pub unsafe extern "C" fn PFFillStyleCreateColor(color: *const PFColorU) -> PFFil
Box::into_raw(Box::new(FillStyle::Color((*color).to_rust())))
}

#[no_mangle]
pub unsafe extern "C" fn PFGradientLinear(from: *const PFVector2F, to: *const PFVector2F) -> PFGradientRef {
Box::into_raw(Box::new(Gradient::linear_from_points((*from).to_rust(), (*to).to_rust())))
}

#[no_mangle]
pub unsafe extern "C" fn PFGradientAdd(gradient: PFGradientRef, stop: PFColorStop) {
(*gradient).add(stop.to_rust());
}

#[no_mangle]
pub unsafe extern "C" fn PFFillStyleCreateGradient(gradient: PFGradientRef) -> PFFillStyleRef {
Box::into_raw(Box::new(FillStyle::Gradient((*gradient).clone())))
}

#[no_mangle]
pub unsafe extern "C" fn PFFillStyleDestroy(fill_style: PFFillStyleRef) {
drop(Box::from_raw(fill_style))
Expand Down Expand Up @@ -867,6 +889,13 @@ impl PFColorU {
}
}

impl PFColorStop {
#[inline]
pub fn to_rust(&self) -> ColorStop {
ColorStop { offset: self.offset, color: self.color.to_rust() }
}
}

// Helpers for `geometry`

impl PFRectF {
Expand Down