1 files changed, 46 insertions, 0 deletions
diff --git a/third_party/rust/dwrote/src/gdi_interop.rs b/third_party/rust/dwrote/src/gdi_interop.rs
new file mode 100644
index 0000000000..fcf27947c8
--- /dev/null
+++ b/third_party/rust/dwrote/src/gdi_interop.rs
@@ -0,0 +1,46 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use std::cell::UnsafeCell;
+use std::ptr;
+use winapi::um::dwrite::IDWriteBitmapRenderTarget;
+use winapi::um::dwrite::IDWriteGdiInterop;
+use wio::com::ComPtr;
+
+use super::{BitmapRenderTarget, DWriteFactory};
+
+pub struct GdiInterop {
+    native: UnsafeCell<ComPtr<IDWriteGdiInterop>>,
+}
+
+impl GdiInterop {
+    pub fn create() -> GdiInterop {
+        unsafe {
+            let mut native: *mut IDWriteGdiInterop = ptr::null_mut();
+            let hr = (*DWriteFactory()).GetGdiInterop(&mut native);
+            assert!(hr == 0);
+            GdiInterop::take(ComPtr::from_raw(native))
+        }
+    }
+
+    pub fn take(native: ComPtr<IDWriteGdiInterop>) -> GdiInterop {
+        GdiInterop {
+            native: UnsafeCell::new(native),
+        }
+    }
+
+    pub fn create_bitmap_render_target(&self, width: u32, height: u32) -> BitmapRenderTarget {
+        unsafe {
+            let mut native: *mut IDWriteBitmapRenderTarget = ptr::null_mut();
+            let hr = (*self.native.get()).CreateBitmapRenderTarget(
+                ptr::null_mut(),
+                width,
+                height,
+                &mut native,
+            );
+            assert!(hr == 0);
+            BitmapRenderTarget::take(ComPtr::from_raw(native))
+        }
+    }
+}