First commit, before upgrading winit to version 28.1

1 files changed, 33 insertions, 0 deletions

diff --git a/src/render_hint.rs b/src/render_hint.rs
new file mode 100644
index 0000000..e4d37c3
--- /dev/null
+++ b/src/render_hint.rs
@@ -0,0 +1,33 @@
+use std::ops::*;
+
+/// A hint to tell a window controller whether the previous render state is
+/// intact and can be updated, or was destroyed and needs to be fully redrawn.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum RenderHint {
+    /// The buffer contents are intact, only updates need to be drawn.
+    Update,
+    /// The buffer contents were destroyed, a full redraw is required.
+    Redraw,
+}
+
+impl RenderHint {
+    pub fn is_update(&self) -> bool { *self == RenderHint::Update }
+    pub fn is_redraw(&self) -> bool { *self == RenderHint::Redraw }
+}
+
+impl BitAnd for RenderHint {
+    type Output = RenderHint;
+    fn bitand(self, other: RenderHint) -> Self::Output {
+        if self == RenderHint::Redraw || other == RenderHint::Redraw {
+            RenderHint::Redraw
+        } else {
+            RenderHint::Update
+        }
+    }
+}
+
+impl BitAndAssign for RenderHint {
+    fn bitand_assign(&mut self, other: RenderHint) {
+        *self = *self & other;
+    }
+}