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#[derive(Copy, Clone)]
pub struct PalAlpha {
pub idx: u8,
pub a: bool,
}
impl From<u8> for PalAlpha {
fn from(idx: u8) -> Self {
PalAlpha{idx:idx, a:true}
}
}
impl From<bool> for PalAlpha {
fn from(a: bool) -> Self {
PalAlpha{idx:0, a:a}
}
}
pub trait PixAlphaAble: Copy {
fn pal_index(&self) -> usize;
fn is_transparent(&self, transparent_index: Option<u8>) -> bool;
}
impl PixAlphaAble for u8 {
#[inline(always)]
fn pal_index(&self) -> usize {
*self as usize
}
#[inline(always)]
fn is_transparent(&self, transparent_index: Option<u8>) -> bool {
if let Some(index) = transparent_index {
return *self == index;
}
return false;
}
}
impl PixAlphaAble for PalAlpha {
#[inline(always)]
fn pal_index(&self) -> usize {
self.idx as usize
}
#[inline(always)]
fn is_transparent(&self, transparent_index: Option<u8>) -> bool {
if let Some(index) = transparent_index {
return self.idx == index;
}
return !self.a;
}
}