Refactor the bitmap backend to multiple files

Author: 38

src/bitmap.rs

@@ -0,0 +1,30 @@
+use std::path::Path;
+use std::marker::PhantomData;
+#[cfg(all(feature = "gif", not(target_arch = "wasm32"), feature = "image"))]
+use crate::gif_support;
+
+pub(super) enum Target<'a> {
+    #[cfg(all(not(target_arch = "wasm32"), feature = "image"))]
+    File(&'a Path),
+    Buffer(PhantomData<&'a u32>),
+    #[cfg(all(feature = "gif", not(target_arch = "wasm32"), feature = "image"))]
+    Gif(Box<gif_support::GifFile>),
+}
+
+pub(super) enum Buffer<'a> {
+    #[cfg(all(not(target_arch = "wasm32"), feature = "image"))]
+    Owned(Vec<u8>),
+    Borrowed(&'a mut [u8]),
+}
+
+impl<'a> Buffer<'a> {
+    #[inline(always)]
+    pub(super) fn borrow_buffer(&mut self) -> &mut [u8] {
+        match self {
+            #[cfg(all(not(target_arch = "wasm32"), feature = "image"))]
+            Buffer::Owned(buf) => &mut buf[..],
+            Buffer::Borrowed(buf) => *buf,
+        }
+    }
+}
+