Adopted Span and MutableSpan for buffers across the library to adapt to Swift 6.4.

Sources/PlaydateKit/Graphics/Graphics.swift

@@ -279,15 +279,25 @@ extension Graphics {
 
     // MARK: - Framebuffer
 
-    /// The current working framebuffer. Rows are `rowSize` bytes.
+    /// Calls `body` with the current working framebuffer: `rows` rows of
+    /// `rowSize` bytes each. Returns `nil` if there is no framebuffer.
     /// Call `markUpdatedRows(from:to:)` after writing directly.
-    public static var frame: UnsafeMutablePointer<UInt8>? {
-        gfx.pointee.getFrame.unsafelyUnwrapped()
+    public static func withFrame<Result, Failure: Error>(
+        _ body: (inout MutableSpan<UInt8>) throws(Failure) -> Result
+    ) throws(Failure) -> Result? {
+        guard let frame = gfx.pointee.getFrame.unsafelyUnwrapped() else { return nil }
+        var span = UnsafeMutableBufferPointer(start: frame, count: rows * rowSize).mutableSpan
+        return try body(&span)
     }
 
-    /// The framebuffer currently shown on the display. Rows are `rowSize` bytes.
-    public static var displayFrame: UnsafeMutablePointer<UInt8>? {
-        gfx.pointee.getDisplayFrame.unsafelyUnwrapped()
+    /// Calls `body` with the framebuffer currently shown on the display:
+    /// `rows` rows of `rowSize` bytes each. Returns `nil` if there is no
+    /// framebuffer.
+    public static func withDisplayFrame<Result, Failure: Error>(
+        _ body: (Span<UInt8>) throws(Failure) -> Result
+    ) throws(Failure) -> Result? {
+        guard let frame = gfx.pointee.getDisplayFrame.unsafelyUnwrapped() else { return nil }
+        return try body(UnsafeBufferPointer(start: frame, count: rows * rowSize).span)
     }
 
     /// A bitmap view of the display framebuffer. Simulator only; `nil` on device.