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use crate::*;
use std::mem::MaybeUninit;
use std::ptr;
/// CIE CAM02
#[repr(transparent)]
pub struct CIECAM02 {
handle: ffi::HANDLE,
}
impl CIECAM02 {
/// A CAM02 object based on given viewing conditions.
///
/// Such object may be used as a color appearance model and evaluated in forward and reverse directions.
/// Viewing conditions structure is detailed in Table 43. The surround member has to be one of the values enumerated in Table 44.
/// Degree of chromatic adaptation (d), can be specified in 0...1.0 range, or the model can be instructed to calculate it by using `D_CALCULATE` constant (-1).
///
/// Viewing conditions.
/// Please note those are CAM model viewing conditions, and not the ICC tag viewing conditions, which I'm naming `cmsICCViewingConditions` to make differences evident. Unfortunately, the tag cannot deal with surround La, Yb and D value so is basically useless to store CAM02 viewing conditions.
pub fn new(conditions: ViewingConditions) -> LCMSResult<Self> {
let handle = unsafe { ffi::cmsCIECAM02Init(ptr::null_mut(), &conditions) };
if !handle.is_null() {
Ok(Self { handle })
} else {
Err(Error::ObjectCreationError)
}
}
/// Evaluates the CAM02 model in the forward direction
pub fn forward(&mut self, input: &CIEXYZ) -> JCh {
unsafe {
let mut out = MaybeUninit::uninit();
ffi::cmsCIECAM02Forward(self.handle, input, out.as_mut_ptr());
out.assume_init()
}
}
/// Evaluates the CAM02 model in the reverse direction
pub fn reverse(&mut self, input: &JCh) -> CIEXYZ {
unsafe {
let mut out = MaybeUninit::uninit();
ffi::cmsCIECAM02Reverse(self.handle, input, out.as_mut_ptr());
out.assume_init()
}
}
}
impl Drop for CIECAM02 {
fn drop(&mut self) {
unsafe {
ffi::cmsCIECAM02Done(self.handle);
}
}
}