TEST_F(APZHitTestingTester, HitTestingRespectsScrollClip_Bug1257288) {
// Create the layer tree.
const char* layerTreeSyntax = "c(tt)";
// LayerID 0 12
nsIntRegion layerVisibleRegion[] = {
nsIntRegion(IntRect(0,0,200,200)),
nsIntRegion(IntRect(0,0,200,200)),
nsIntRegion(IntRect(0,0,200,100))
};
root = CreateLayerTree(layerTreeSyntax, layerVisibleRegion, nullptr, lm, layers);
// Add root scroll metadata to the first painted layer.
SetScrollableFrameMetrics(layers[1], FrameMetrics::START_SCROLL_ID, CSSRect(0,0,200,200));
// Add root and subframe scroll metadata to the second painted layer.
// Give the subframe metadata a scroll clip corresponding to the subframe's
// composition bounds.
// Importantly, give the layer a layer clip which leaks outside of the
// subframe's composition bounds.
ScrollMetadata rootMetadata = BuildScrollMetadata(
FrameMetrics::START_SCROLL_ID, CSSRect(0,0,200,200),
ParentLayerRect(0,0,200,200));
ScrollMetadata subframeMetadata = BuildScrollMetadata(
FrameMetrics::START_SCROLL_ID + 1, CSSRect(0,0,200,200),
ParentLayerRect(0,0,200,100));
subframeMetadata.SetScrollClip(Some(LayerClip(ParentLayerIntRect(0,0,200,100))));
layers[2]->SetScrollMetadata({subframeMetadata, rootMetadata});
layers[2]->SetClipRect(Some(ParentLayerIntRect(0,0,200,200)));
SetEventRegionsBasedOnBottommostMetrics(layers[2]);
// Build the hit testing tree.
ScopedLayerTreeRegistration registration(manager, 0, root, mcc);
manager->UpdateHitTestingTree(nullptr, root, false, 0, 0);
// Pan on a region that's inside layers[2]'s layer clip, but outside
// its subframe metadata's scroll clip.
Pan(manager, 120, 110);
// Test that the subframe hasn't scrolled.
EXPECT_EQ(CSSPoint(0,0), ApzcOf(layers[2], 0)->GetFrameMetrics().GetScrollOffset());
}
