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use crate::Matrix;
use glib::translate::*;
use std::mem;
glib_wrapper! {
#[derive(Debug, PartialOrd, Ord)] // Hash
pub struct MatrixEntry(Shared<ffi::CoglMatrixEntry>);
match fn {
ref => |ptr| ffi::cogl_matrix_entry_ref(ptr),
unref => |ptr| ffi::cogl_matrix_entry_unref(ptr),
get_type => || ffi::cogl_matrix_entry_get_gtype(),
}
}
impl MatrixEntry {
/// Determines if the only difference between two transforms is a
/// translation and if so returns what the `x`, `y`, and `z` components of
/// the translation are.
///
/// If the difference between the two translations involves anything
/// other than a translation then the function returns `false`.
/// ## `other`
/// A second reference transform
/// ## `x`
/// The destination for the x-component of the translation
/// ## `y`
/// The destination for the y-component of the translation
/// ## `z`
/// The destination for the z-component of the translation
///
/// # Returns
///
/// `true` if the only difference between the transform of
/// `self` and the transform of `other` is a translation,
/// otherwise `false`.
pub fn calculate_translation(&self, other: &MatrixEntry) -> (bool, f32, f32, f32) {
unsafe {
let mut x = mem::MaybeUninit::uninit();
let mut y = mem::MaybeUninit::uninit();
let mut z = mem::MaybeUninit::uninit();
let ret = ffi::cogl_matrix_entry_calculate_translation(
self.to_glib_none().0,
other.to_glib_none().0,
x.as_mut_ptr(),
y.as_mut_ptr(),
z.as_mut_ptr(),
);
let x = x.assume_init();
let y = y.assume_init();
let z = z.assume_init();
(ret == crate::TRUE, x, y, z)
}
}
/// Compares two arbitrary `MatrixEntry` transforms for equality
/// returning `true` if they are equal or `false` otherwise.
///
/// `<note>`In many cases it is unnecessary to use this api and instead
/// direct pointer comparisons of entries are good enough and much
/// cheaper too.`</note>`
/// ## `other`
/// A second `MatrixEntry` to compare
///
/// # Returns
///
/// `true` if `self` represents the same transform as
/// `other`, otherwise `false`.
fn equal(&self, other: &Self) -> bool {
unsafe {
ffi::cogl_matrix_entry_equal(self.to_glib_none().0, other.to_glib_none().0)
== crate::TRUE
}
}
/// Resolves the current `self` transform into a `Matrix` by
/// combining the sequence of operations that have been applied to
/// build up the current transform.
///
/// There are two possible ways that this function may return its
/// result depending on whether it's possible to directly point
/// to an internal `Matrix` or whether the result needs to be
/// composed of multiple operations.
///
/// If an internal matrix contains the required result then this
/// function will directly return a pointer to that matrix, otherwise
/// if the function returns `None` then `matrix` will be initialized
/// to match the transform of `self`.
///
/// `<note>``matrix` will be left untouched if a direct pointer is
/// returned.`</note>`
/// ## `matrix`
/// The potential destination for the transform as
/// a matrix
///
/// # Returns
///
/// A direct pointer to a `Matrix` transform or `None`
/// and in that case `matrix` will be initialized with
/// the effective transform represented by `self`.
pub fn get(&self) -> (Matrix, Matrix) {
unsafe {
let mut matrix = Matrix::uninitialized();
let ret = from_glib_full(ffi::cogl_matrix_entry_get(
self.to_glib_none().0,
matrix.to_glib_none_mut().0,
));
(ret, matrix)
}
}
/// Determines whether `self` is known to represent an identity
/// transform.
///
/// If this returns `true` then the entry is definitely the identity
/// matrix. If it returns `false` it may or may not be the identity
/// matrix but no expensive comparison is performed to verify it.
///
/// # Returns
///
/// `true` if `self` is definitely an identity transform,
/// otherwise `false`.
pub fn is_identity(&self) -> bool {
unsafe { ffi::cogl_matrix_entry_is_identity(self.to_glib_none().0) == crate::TRUE }
}
}
impl PartialEq for MatrixEntry {
#[inline]
fn eq(&self, other: &Self) -> bool {
MatrixEntry::equal(self, other)
}
}
impl Eq for MatrixEntry {}