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//! Constants for bitmap byte order.
#![allow(non_upper_case_globals)]
pub const kCGBitmapByteOrder32Little: u32 = 2 << 12;
pub const kCGBitmapByteOrder32Big: u32 = 4 << 12;
#[cfg(target_endian = "little")]
pub const kCGBitmapByteOrder32Host: u32 = kCGBitmapByteOrder32Little;
#[cfg(target_endian = "big")]
pub const kCGBitmapByteOrder32Host: u32 = kCGBitmapByteOrder32Big;
#[cfg(target_endian = "little")]
pub fn extract_rgba(bytes: &[u8]) -> Vec<u8> {
let pixels = bytes.len() / 4;
let mut rgb = Vec::with_capacity(pixels * 4);
for i in 0..pixels {
let offset = i * 4;
rgb.push(bytes[offset + 2]);
rgb.push(bytes[offset + 1]);
rgb.push(bytes[offset]);
rgb.push(bytes[offset + 3]);
}
rgb
}
#[cfg(target_endian = "big")]
pub fn extract_rgba(bytes: Vec<u8>) -> Vec<u8> {
bytes
}
#[cfg(target_endian = "little")]
pub fn extract_rgb(bytes: &[u8]) -> Vec<u8> {
let pixels = bytes.len() / 4;
let mut rgb = Vec::with_capacity(pixels * 3);
for i in 0..pixels {
let offset = i * 4;
rgb.push(bytes[offset + 2]);
rgb.push(bytes[offset + 1]);
rgb.push(bytes[offset]);
}
rgb
}
#[cfg(target_endian = "big")]
pub fn extract_rgb(bytes: Vec<u8>) -> Vec<u8> {
bytes
.into_iter()
.enumerate()
.filter(|&(index, _)| ((index) % 4) != 0)
.map(|(_, val)| val)
.collect::<Vec<_>>()
}
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