1 files changed, 63 insertions, 0 deletions
diff --git a/widget/android/AndroidCompositorWidget.cpp b/widget/android/AndroidCompositorWidget.cpp
new file mode 100644
index 000000000..91cc08531
--- /dev/null
+++ b/widget/android/AndroidCompositorWidget.cpp
@@ -0,0 +1,63 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=2 et tw=80 : */
+/* 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 "AndroidCompositorWidget.h"
+#include "nsWindow.h"
+
+namespace mozilla {
+namespace widget {
+
+void
+AndroidCompositorWidget::SetFirstPaintViewport(const LayerIntPoint& aOffset,
+                                               const CSSToLayerScale& aZoom,
+                                               const CSSRect& aCssPageRect)
+{
+    auto layerClient = static_cast<nsWindow*>(RealWidget())->GetLayerClient();
+    if (!layerClient) {
+        return;
+    }
+
+    layerClient->SetFirstPaintViewport(
+            float(aOffset.x), float(aOffset.y), aZoom.scale, aCssPageRect.x,
+            aCssPageRect.y, aCssPageRect.XMost(), aCssPageRect.YMost());
+}
+
+void
+AndroidCompositorWidget::SyncFrameMetrics(const ParentLayerPoint& aScrollOffset,
+                                          const CSSToParentLayerScale& aZoom,
+                                          const CSSRect& aCssPageRect,
+                                          const CSSRect& aDisplayPort,
+                                          const CSSToLayerScale& aPaintedResolution,
+                                          bool aLayersUpdated,
+                                          int32_t aPaintSyncId,
+                                          ScreenMargin& aFixedLayerMargins)
+{
+    auto layerClient = static_cast<nsWindow*>(RealWidget())->GetLayerClient();
+    if (!layerClient) {
+        return;
+    }
+
+    // convert the displayport rect from document-relative CSS pixels to
+    // document-relative device pixels
+    LayerIntRect dp = gfx::RoundedToInt(aDisplayPort * aPaintedResolution);
+
+    java::ViewTransform::LocalRef viewTransform = layerClient->SyncFrameMetrics(
+            aScrollOffset.x, aScrollOffset.y, aZoom.scale,
+            aCssPageRect.x, aCssPageRect.y,
+            aCssPageRect.XMost(), aCssPageRect.YMost(),
+            dp.x, dp.y, dp.width, dp.height,
+            aPaintedResolution.scale, aLayersUpdated, aPaintSyncId);
+
+    MOZ_ASSERT(viewTransform, "No view transform object!");
+
+    aFixedLayerMargins.top = viewTransform->FixedLayerMarginTop();
+    aFixedLayerMargins.right = viewTransform->FixedLayerMarginRight();
+    aFixedLayerMargins.bottom = viewTransform->FixedLayerMarginBottom();
+    aFixedLayerMargins.left = viewTransform->FixedLayerMarginLeft();
+}
+
+} // namespace widget
+} // namespace mozilla