1 files changed, 124 insertions, 0 deletions
diff --git a/gfx/layers/apz/testutil/APZTestData.cpp b/gfx/layers/apz/testutil/APZTestData.cpp
new file mode 100644
index 0000000000..4154607d75
--- /dev/null
+++ b/gfx/layers/apz/testutil/APZTestData.cpp
@@ -0,0 +1,124 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 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 "APZTestData.h"
+#include "mozilla/dom/APZTestDataBinding.h"
+#include "mozilla/dom/ToJSValue.h"
+#include "nsString.h"
+
+namespace mozilla {
+namespace layers {
+
+struct APZTestDataToJSConverter {
+  template <typename Key, typename Value, typename KeyValuePair>
+  static void ConvertMap(const std::map<Key, Value>& aFrom,
+                         dom::Sequence<KeyValuePair>& aOutTo,
+                         void (*aElementConverter)(const Key&, const Value&,
+                                                   KeyValuePair&)) {
+    for (auto it = aFrom.begin(); it != aFrom.end(); ++it) {
+      if (!aOutTo.AppendElement(fallible)) {
+        // XXX(Bug 1632090) Instead of extending the array 1-by-1 (which might
+        // involve multiple reallocations) and potentially crashing here,
+        // SetCapacity could be called outside the loop once.
+        mozalloc_handle_oom(0);
+      }
+      aElementConverter(it->first, it->second, aOutTo.LastElement());
+    }
+  }
+
+  template <typename Src, typename Target>
+  static void ConvertList(const nsTArray<Src>& aFrom,
+                          dom::Sequence<Target>& aOutTo,
+                          void (*aElementConverter)(const Src&, Target&)) {
+    for (auto it = aFrom.begin(); it != aFrom.end(); ++it) {
+      if (!aOutTo.AppendElement(fallible)) {
+        // XXX(Bug 1632090) Instead of extending the array 1-by-1 (which might
+        // involve multiple reallocations) and potentially crashing here,
+        // SetCapacity could be called outside the loop once.
+        mozalloc_handle_oom(0);
+      }
+      aElementConverter(*it, aOutTo.LastElement());
+    }
+  }
+
+  static void ConvertAPZTestData(const APZTestData& aFrom,
+                                 dom::APZTestData& aOutTo) {
+    ConvertMap(aFrom.mPaints, aOutTo.mPaints.Construct(), ConvertBucket);
+    ConvertMap(aFrom.mRepaintRequests, aOutTo.mRepaintRequests.Construct(),
+               ConvertBucket);
+    ConvertList(aFrom.mHitResults, aOutTo.mHitResults.Construct(),
+                ConvertHitResult);
+    ConvertList(aFrom.mSampledResults, aOutTo.mSampledResults.Construct(),
+                ConvertSampledResult);
+    ConvertMap(aFrom.mAdditionalData, aOutTo.mAdditionalData.Construct(),
+               ConvertAdditionalDataEntry);
+  }
+
+  static void ConvertBucket(const SequenceNumber& aKey,
+                            const APZTestData::Bucket& aValue,
+                            dom::APZBucket& aOutKeyValuePair) {
+    aOutKeyValuePair.mSequenceNumber.Construct() = aKey;
+    ConvertMap(aValue, aOutKeyValuePair.mScrollFrames.Construct(),
+               ConvertScrollFrameData);
+  }
+
+  static void ConvertScrollFrameData(const APZTestData::ViewID& aKey,
+                                     const APZTestData::ScrollFrameData& aValue,
+                                     dom::ScrollFrameData& aOutKeyValuePair) {
+    aOutKeyValuePair.mScrollId.Construct() = aKey;
+    ConvertMap(aValue, aOutKeyValuePair.mEntries.Construct(), ConvertEntry);
+  }
+
+  static void ConvertEntry(const std::string& aKey, const std::string& aValue,
+                           dom::ScrollFrameDataEntry& aOutKeyValuePair) {
+    ConvertString(aKey, aOutKeyValuePair.mKey.Construct());
+    ConvertString(aValue, aOutKeyValuePair.mValue.Construct());
+  }
+
+  static void ConvertAdditionalDataEntry(
+      const std::string& aKey, const std::string& aValue,
+      dom::AdditionalDataEntry& aOutKeyValuePair) {
+    ConvertString(aKey, aOutKeyValuePair.mKey.Construct());
+    ConvertString(aValue, aOutKeyValuePair.mValue.Construct());
+  }
+
+  static void ConvertString(const std::string& aFrom, nsString& aOutTo) {
+    CopyUTF8toUTF16(aFrom, aOutTo);
+  }
+
+  static void ConvertHitResult(const APZTestData::HitResult& aResult,
+                               dom::APZHitResult& aOutHitResult) {
+    aOutHitResult.mScreenX.Construct() = aResult.point.x;
+    aOutHitResult.mScreenY.Construct() = aResult.point.y;
+    static_assert(MaxEnumValue<gfx::CompositorHitTestInfo::valueType>::value <
+                      std::numeric_limits<uint16_t>::digits,
+                  "CompositorHitTestFlags MAX value have to be less than "
+                  "number of bits in uint16_t");
+    aOutHitResult.mHitResult.Construct() =
+        static_cast<uint16_t>(aResult.result.serialize());
+    aOutHitResult.mLayersId.Construct() = aResult.layersId.mId;
+    aOutHitResult.mScrollId.Construct() = aResult.scrollId;
+  }
+
+  static void ConvertSampledResult(const APZTestData::SampledResult& aResult,
+                                   dom::APZSampledResult& aOutSampledResult) {
+    aOutSampledResult.mScrollOffsetX.Construct() = aResult.scrollOffset.x;
+    aOutSampledResult.mScrollOffsetY.Construct() = aResult.scrollOffset.y;
+    aOutSampledResult.mLayersId.Construct() = aResult.layersId.mId;
+    aOutSampledResult.mScrollId.Construct() = aResult.scrollId;
+    aOutSampledResult.mSampledTimeStamp.Construct() = aResult.sampledTimeStamp;
+  }
+};
+
+bool APZTestData::ToJS(JS::MutableHandle<JS::Value> aOutValue,
+                       JSContext* aContext) const {
+  dom::APZTestData result;
+  APZTestDataToJSConverter::ConvertAPZTestData(*this, result);
+  return dom::ToJSValue(aContext, result, aOutValue);
+}
+
+}  // namespace layers
+}  // namespace mozilla