rs-vips 0.7.0

Safe bindings for libvips
Documentation 
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// (c) Copyright 2019-2025 OLX
// (c) Copyright 2025 mrdkprj
use crate::{
    bindings,
    error::Error,
    utils::{new_c_string, result_cond},
    Result,
};
use std::ffi::c_void;

/// Base struct for the various interpolation functions
#[derive(Debug, Clone)]
pub struct VipsInterpolate {
    pub(crate) ctx: *mut bindings::VipsInterpolate,
}

impl VipsInterpolate {
    /// Look up an interpolator from a nickname and make one.
    pub fn new_from_name(name: &str) -> Result<VipsInterpolate> {
        unsafe {
            let nickname = new_c_string(name)?;
            let res = bindings::vips_interpolate_new(nickname.as_ptr());
            result_cond(
                !res.is_null(),
                VipsInterpolate {
                    ctx: res,
                },
                Error::InitializationError(
                    "Cannot initialize interpolator with provided nickname".to_string(),
                ),
            )
        }
    }

    /// A convenience function that returns a nearest-neighbour interpolator you don’t need to free.
    pub fn new_from_neasest_static() -> VipsInterpolate {
        unsafe {
            VipsInterpolate {
                ctx: bindings::vips_interpolate_nearest_static(),
            }
        }
    }

    /// A convenience function that returns a bilinear interpolator you don’t need to free.
    pub fn new_from_bilinear_static() -> VipsInterpolate {
        unsafe {
            VipsInterpolate {
                ctx: bindings::vips_interpolate_bilinear_static(),
            }
        }
    }

    /// Look up an interpolators desired window size.
    pub fn get_window_size(&self) -> i32 {
        unsafe { bindings::vips_interpolate_get_window_size(self.ctx) }
    }

    /// Look up an interpolators desired window offset.
    pub fn get_windows_offset(&self) -> i32 {
        unsafe { bindings::vips_interpolate_get_window_offset(self.ctx) }
    }
}

impl Drop for VipsInterpolate {
    fn drop(&mut self) {
        unsafe {
            if !self
                .ctx
                .is_null()
            {
                bindings::g_object_unref(self.ctx as *mut c_void);
            }
        }
    }
}