1 files changed, 64 insertions, 0 deletions
diff --git a/widget/gtk/WindowSurfaceX11.cpp b/widget/gtk/WindowSurfaceX11.cpp
new file mode 100644
index 0000000000..32e3c43ef9
--- /dev/null
+++ b/widget/gtk/WindowSurfaceX11.cpp
@@ -0,0 +1,64 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * 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/. */
+
+#include "WindowSurfaceX11.h"
+#include "gfxPlatform.h"
+#include "X11UndefineNone.h"
+
+namespace mozilla {
+namespace widget {
+
+WindowSurfaceX11::WindowSurfaceX11(Display* aDisplay,
+                                   Window aWindow,
+                                   Visual* aVisual,
+                                   unsigned int aDepth)
+  : mDisplay(aDisplay)
+  , mWindow(aWindow)
+  , mVisual(aVisual)
+  , mDepth(aDepth)
+  , mFormat(GetVisualFormat(aVisual, aDepth))
+{
+}
+
+/* static */
+gfx::SurfaceFormat
+WindowSurfaceX11::GetVisualFormat(const Visual* aVisual, unsigned int aDepth)
+{
+  switch (aDepth) {
+  case 32:
+    if (aVisual->red_mask == 0xff0000 &&
+        aVisual->green_mask == 0xff00 &&
+        aVisual->blue_mask == 0xff) {
+      return gfx::SurfaceFormat::B8G8R8A8;
+    }
+    break;
+  case 24:
+    // Only support the BGRX layout, and report it as BGRA to the compositor.
+    // The alpha channel will be discarded when we put the image.
+    // Cairo/pixman lacks some fast paths for compositing BGRX onto BGRA, so
+    // just report it as BGRX directly in that case.
+    if (aVisual->red_mask == 0xff0000 &&
+        aVisual->green_mask == 0xff00 &&
+        aVisual->blue_mask == 0xff) {
+      gfx::BackendType backend = gfxPlatform::GetPlatform()->GetDefaultContentBackend();
+      return backend == gfx::BackendType::CAIRO ? gfx::SurfaceFormat::B8G8R8X8
+                                                : gfx::SurfaceFormat::B8G8R8A8;
+    }
+    break;
+  case 16:
+    if (aVisual->red_mask == 0xf800 &&
+        aVisual->green_mask == 0x07e0 &&
+        aVisual->blue_mask == 0x1f) {
+      return gfx::SurfaceFormat::R5G6B5_UINT16;
+    }
+    break;
+  }
+
+  return gfx::SurfaceFormat::UNKNOWN;
+}
+
+}  // namespace widget
+}  // namespace mozilla