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use crate::{ffi, Bitmap, Gray, RGB};

/// Rendering target helper trait
pub trait RenderTarget<Source>: Sized {
    fn render(target: &mut Bitmap<Self>, source: &Bitmap<Source>, px_range: f64);
}

impl RenderTarget<Gray<f32>> for Gray<f32> {
    fn render(target: &mut Bitmap<Self>, source: &Bitmap<Gray<f32>>, px_range: f64) {
        unsafe {
            ffi::msdfgen_renderSDF(target.as_raw_mut(), source.as_raw(), px_range);
        }
    }
}

impl RenderTarget<Gray<f32>> for RGB<f32> {
    fn render(target: &mut Bitmap<Self>, source: &Bitmap<Gray<f32>>, px_range: f64) {
        unsafe {
            ffi::msdfgen_renderSDF1(target.as_raw_mut(), source.as_raw(), px_range);
        }
    }
}

impl RenderTarget<RGB<f32>> for Gray<f32> {
    fn render(target: &mut Bitmap<Self>, source: &Bitmap<RGB<f32>>, px_range: f64) {
        unsafe {
            ffi::msdfgen_renderSDF2(target.as_raw_mut(), source.as_raw(), px_range);
        }
    }
}

impl RenderTarget<RGB<f32>> for RGB<f32> {
    fn render(target: &mut Bitmap<Self>, source: &Bitmap<RGB<f32>>, px_range: f64) {
        unsafe {
            ffi::msdfgen_renderSDF3(target.as_raw_mut(), source.as_raw(), px_range);
        }
    }
}

impl<S> Bitmap<S> {
    pub fn render<T: RenderTarget<S>>(&self, target: &mut Bitmap<T>, px_range: f64) {
        T::render(target, self, px_range)
    }
}