| //! 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<_>>() |
| } |