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/* -*- 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
#include "TestWRScrollData.h"
#include "APZTestAccess.h"
#include "gtest/gtest.h"
#include "FrameMetrics.h"
#include "gfxPlatform.h"
#include "mozilla/layers/APZUpdater.h"
#include "mozilla/layers/LayersTypes.h"
#include "mozilla/layers/ScrollableLayerGuid.h"
#include "mozilla/layers/WebRenderScrollDataWrapper.h"
#include "mozilla/UniquePtr.h"
#include "apz/src/APZCTreeManager.h"
using mozilla::layers::APZCTreeManager;
using mozilla::layers::APZUpdater;
using mozilla::layers::LayersId;
using mozilla::layers::ScrollableLayerGuid;
using mozilla::layers::ScrollMetadata;
using mozilla::layers::TestWRScrollData;
using mozilla::layers::WebRenderLayerScrollData;
using mozilla::layers::WebRenderScrollDataWrapper;
/* static */
TestWRScrollData TestWRScrollData::Create(const char* aTreeShape,
const APZUpdater& aUpdater,
const LayerIntRect* aVisibleRects,
const gfx::Matrix4x4* aTransforms) {
// The WebRenderLayerScrollData tree needs to be created in a fairly
// particular way (for example, each node needs to know the number of
// descendants it has), so this function takes care to create the nodes
// in the same order as WebRenderCommandBuilder would.
TestWRScrollData result;
const size_t len = strlen(aTreeShape);
// "Layer index" in this function refers to the index by which a layer will
// be accessible via TestWRScrollData::GetLayer(), and matches the order
// in which the layer appears in |aTreeShape|.
size_t currentLayerIndex = 0;
struct LayerEntry {
size_t mLayerIndex;
int32_t mDescendantCount = 0;
};
// Layers we have encountered in |aTreeShape|, but have not built a
// WebRenderLayerScrollData for. (It can only be built after its
// descendants have been encountered and counted.)
std::stack<LayerEntry> pendingLayers;
std::vector<WebRenderLayerScrollData> finishedLayers;
// Tracks the level of nesting of '(' characters. Starts at 1 to account
// for the root layer.
size_t depth = 1;
// Helper function for finishing a layer once all its descendants have been
// encountered.
auto finishLayer = [&] {
MOZ_ASSERT(!pendingLayers.empty());
LayerEntry entry = pendingLayers.top();
WebRenderLayerScrollData layer;
APZTestAccess::InitializeForTest(layer, entry.mDescendantCount);
if (aVisibleRects) {
layer.SetVisibleRect(aVisibleRects[entry.mLayerIndex]);
}
if (aTransforms) {
layer.SetTransform(aTransforms[entry.mLayerIndex]);
}
finishedLayers.push_back(std::move(layer));
// |finishedLayers| stores the layers in a different order than they
// appeared in |aTreeShape|. To be able to access layers by their layer
// index, keep a mapping from layer index to index in |finishedLayers|.
result.mIndexMap.emplace(entry.mLayerIndex, finishedLayers.size() - 1);
pendingLayers.pop();
// Keep track of descendant counts. The +1 is for the layer just finished.
if (!pendingLayers.empty()) {
pendingLayers.top().mDescendantCount += (entry.mDescendantCount + 1);
}
};
for (size_t i = 0; i < len; ++i) {
if (aTreeShape[i] == '(') {
++depth;
} else if (aTreeShape[i] == ')') {
if (pendingLayers.size() <= 1) {
printf("Invalid tree shape: too many ')'\n");
MOZ_CRASH();
}
finishLayer(); // finish last layer at current depth
--depth;
} else {
if (aTreeShape[i] != 'x') {
printf("The only allowed character to represent a layer is 'x'\n");
MOZ_CRASH();
}
if (depth == pendingLayers.size()) {
// We have a previous layer at this same depth to finish.
if (depth <= 1) {
printf("The tree is only allowed to have one root\n");
MOZ_CRASH();
}
finishLayer();
}
MOZ_ASSERT(depth == pendingLayers.size() + 1);
pendingLayers.push({currentLayerIndex});
++currentLayerIndex;
}
}
if (pendingLayers.size() != 1) {
printf("Invalid tree shape: '(' and ')' not balanced\n");
MOZ_CRASH();
}
finishLayer(); // finish root layer
// As in WebRenderCommandBuilder, the layers need to be added to the
// WebRenderScrollData in reverse of the order in which they were built.
for (auto it = finishedLayers.rbegin(); it != finishedLayers.rend(); ++it) {
result.AddLayerData(std::move(*it));
}
// mIndexMap also needs to be adjusted to accout for the reversal above.
for (auto& [layerIndex, storedIndex] : result.mIndexMap) {
(void)layerIndex; // suppress -Werror=unused-variable
storedIndex = result.GetLayerCount() - storedIndex - 1;
}
return result;
}
const WebRenderLayerScrollData* TestWRScrollData::operator[](
size_t aLayerIndex) const {
auto it = mIndexMap.find(aLayerIndex);
if (it == mIndexMap.end()) {
return nullptr;
}
return GetLayerData(it->second);
}
WebRenderLayerScrollData* TestWRScrollData::operator[](size_t aLayerIndex) {
auto it = mIndexMap.find(aLayerIndex);
if (it == mIndexMap.end()) {
return nullptr;
}
return GetLayerData(it->second);
}
void TestWRScrollData::SetScrollMetadata(
size_t aLayerIndex, const nsTArray<ScrollMetadata>& aMetadata) {
WebRenderLayerScrollData* layer = operator[](aLayerIndex);
MOZ_ASSERT(layer);
for (const ScrollMetadata& metadata : aMetadata) {
layer->AppendScrollMetadata(*this, metadata);
}
}
class WebRenderScrollDataWrapperTester : public ::testing::Test {
protected:
virtual void SetUp() {
// This ensures ScrollMetadata::sNullMetadata is initialized.
gfxPlatform::GetPlatform();
mManager = APZCTreeManager::Create(LayersId{0});
mUpdater = new APZUpdater(mManager, false);
}
RefPtr<APZCTreeManager> mManager;
RefPtr<APZUpdater> mUpdater;
};
TEST_F(WebRenderScrollDataWrapperTester, SimpleTree) {
auto layers = TestWRScrollData::Create("x(x(x(xx)x(x)))", *mUpdater);
WebRenderScrollDataWrapper w0(*mUpdater, &layers);
ASSERT_EQ(layers[0], w0.GetLayer());
WebRenderScrollDataWrapper w1 = w0.GetLastChild();
ASSERT_EQ(layers[1], w1.GetLayer());
ASSERT_FALSE(w1.GetPrevSibling().IsValid());
WebRenderScrollDataWrapper w5 = w1.GetLastChild();
ASSERT_EQ(layers[5], w5.GetLayer());
WebRenderScrollDataWrapper w6 = w5.GetLastChild();
ASSERT_EQ(layers[6], w6.GetLayer());
ASSERT_FALSE(w6.GetLastChild().IsValid());
WebRenderScrollDataWrapper w2 = w5.GetPrevSibling();
ASSERT_EQ(layers[2], w2.GetLayer());
ASSERT_FALSE(w2.GetPrevSibling().IsValid());
WebRenderScrollDataWrapper w4 = w2.GetLastChild();
ASSERT_EQ(layers[4], w4.GetLayer());
ASSERT_FALSE(w4.GetLastChild().IsValid());
WebRenderScrollDataWrapper w3 = w4.GetPrevSibling();
ASSERT_EQ(layers[3], w3.GetLayer());
ASSERT_FALSE(w3.GetLastChild().IsValid());
ASSERT_FALSE(w3.GetPrevSibling().IsValid());
}
static ScrollMetadata MakeMetadata(ScrollableLayerGuid::ViewID aId) {
ScrollMetadata metadata;
metadata.GetMetrics().SetScrollId(aId);
return metadata;
}
TEST_F(WebRenderScrollDataWrapperTester, MultiFramemetricsTree) {
auto layers = TestWRScrollData::Create("x(x(x(xx)x(x)))", *mUpdater);
nsTArray<ScrollMetadata> metadata;
metadata.InsertElementAt(0,
MakeMetadata(ScrollableLayerGuid::START_SCROLL_ID +
0)); // topmost of root layer
metadata.InsertElementAt(0,
MakeMetadata(ScrollableLayerGuid::NULL_SCROLL_ID));
metadata.InsertElementAt(
0, MakeMetadata(ScrollableLayerGuid::START_SCROLL_ID + 1));
metadata.InsertElementAt(
0, MakeMetadata(ScrollableLayerGuid::START_SCROLL_ID + 2));
metadata.InsertElementAt(0,
MakeMetadata(ScrollableLayerGuid::NULL_SCROLL_ID));
metadata.InsertElementAt(
0, MakeMetadata(
ScrollableLayerGuid::NULL_SCROLL_ID)); // bottom of root layer
layers.SetScrollMetadata(0, metadata);
metadata.Clear();
metadata.InsertElementAt(
0, MakeMetadata(ScrollableLayerGuid::START_SCROLL_ID + 3));
layers.SetScrollMetadata(1, metadata);
metadata.Clear();
metadata.InsertElementAt(
0, MakeMetadata(ScrollableLayerGuid::START_SCROLL_ID + 4));
layers.SetScrollMetadata(2, metadata);
metadata.Clear();
metadata.InsertElementAt(
0, MakeMetadata(ScrollableLayerGuid::START_SCROLL_ID + 5));
layers.SetScrollMetadata(4, metadata);
metadata.Clear();
metadata.InsertElementAt(0,
MakeMetadata(ScrollableLayerGuid::NULL_SCROLL_ID));
metadata.InsertElementAt(
0, MakeMetadata(ScrollableLayerGuid::START_SCROLL_ID + 6));
layers.SetScrollMetadata(5, metadata);
WebRenderScrollDataWrapper wrapper(*mUpdater, &layers);
nsTArray<WebRenderLayerScrollData*> expectedLayers;
expectedLayers.AppendElement(layers[0]);
expectedLayers.AppendElement(layers[0]);
expectedLayers.AppendElement(layers[0]);
expectedLayers.AppendElement(layers[0]);
expectedLayers.AppendElement(layers[0]);
expectedLayers.AppendElement(layers[0]);
expectedLayers.AppendElement(layers[1]);
expectedLayers.AppendElement(layers[5]);
expectedLayers.AppendElement(layers[5]);
expectedLayers.AppendElement(layers[6]);
nsTArray<ScrollableLayerGuid::ViewID> expectedIds;
expectedIds.AppendElement(ScrollableLayerGuid::START_SCROLL_ID + 0);
expectedIds.AppendElement(ScrollableLayerGuid::NULL_SCROLL_ID);
expectedIds.AppendElement(ScrollableLayerGuid::START_SCROLL_ID + 1);
expectedIds.AppendElement(ScrollableLayerGuid::START_SCROLL_ID + 2);
expectedIds.AppendElement(ScrollableLayerGuid::NULL_SCROLL_ID);
expectedIds.AppendElement(ScrollableLayerGuid::NULL_SCROLL_ID);
expectedIds.AppendElement(ScrollableLayerGuid::START_SCROLL_ID + 3);
expectedIds.AppendElement(ScrollableLayerGuid::NULL_SCROLL_ID);
expectedIds.AppendElement(ScrollableLayerGuid::START_SCROLL_ID + 6);
expectedIds.AppendElement(ScrollableLayerGuid::NULL_SCROLL_ID);
for (int i = 0; i < 10; i++) {
ASSERT_EQ(expectedLayers[i], wrapper.GetLayer());
ASSERT_EQ(expectedIds[i], wrapper.Metrics().GetScrollId());
wrapper = wrapper.GetLastChild();
}
ASSERT_FALSE(wrapper.IsValid());
}