1 files changed, 34 insertions, 0 deletions
diff --git a/font/src/darwin/byte_order.rs b/font/src/darwin/byte_order.rs
new file mode 100644
index 00000000..5b696554
--- /dev/null
+++ b/font/src/darwin/byte_order.rs
@@ -0,0 +1,34 @@
+//! 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_rgb(bytes: Vec<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 + 0]);
+    }
+
+    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<_>>()
+}