mirror of
https://github.com/mozilla/gecko-dev.git
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243 lines
8.5 KiB
HTML
243 lines
8.5 KiB
HTML
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<!DOCTYPE HTML>
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<html>
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<!--
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https://bugzilla.mozilla.org/show_bug.cgi?id=982141
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-->
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<head>
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<meta charset="utf-8">
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<title>Test for Bug 982141, helper page</title>
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<script type="application/javascript">
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// -------------------------------------------------------------------
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// Infrastructure to get the test assertions to run at the right time.
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// -------------------------------------------------------------------
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var SimpleTest = window.opener.SimpleTest;
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window.onload = function() {
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window.addEventListener("MozAfterPaint", afterPaint, false);
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};
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var utils = SpecialPowers.getDOMWindowUtils(window);
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function afterPaint(e) {
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// If there is another paint pending, wait for it.
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if (utils.isMozAfterPaintPending) {
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return;
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}
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// Once there are no more paints pending, remove the
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// MozAfterPaint listener and run the test logic.
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window.removeEventListener("MozAfterPaint", afterPaint, false);
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testBug982141();
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}
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// ----------------------------------------------------------------------
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// Functions that convert the APZ test data into a more usable form.
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// Every place we have a WebIDL sequence whose elements are dictionaries
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// with two elements, a key, and a value, we convert this into a JS
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// object with a property for each key/value pair. (This is the structure
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// we really want, but we can't express in directly in WebIDL.)
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// ----------------------------------------------------------------------
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function convertEntries(entries) {
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var result = {};
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for (var i = 0; i < entries.length; ++i) {
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result[entries[i].key] = entries[i].value;
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}
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return result;
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}
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function convertScrollFrameData(scrollFrames) {
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var result = {};
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for (var i = 0; i < scrollFrames.length; ++i) {
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result[scrollFrames[i].scrollId] = convertEntries(scrollFrames[i].entries);
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}
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return result;
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}
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function convertBuckets(buckets) {
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var result = {};
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for (var i = 0; i < buckets.length; ++i) {
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result[buckets[i].sequenceNumber] = convertScrollFrameData(buckets[i].scrollFrames);
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}
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return result;
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}
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function convertTestData(testData) {
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var result = {};
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result.paints = convertBuckets(testData.paints);
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result.repaintRequests = convertBuckets(testData.repaintRequests);
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return result;
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}
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// ----------------------------------------------------------------
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// Utilities for reconstructing the structure of the APZC tree from
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// 'parentScrollId' entries in the APZ test data.
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// ----------------------------------------------------------------
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// Create a node with scroll id 'id' in the APZC tree.
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function makeNode(id) {
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return {scrollId: id, children: []};
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}
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// Find a node with scroll id 'id' in the APZC tree rooted at 'root'.
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function findNode(root, id) {
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if (root.scrollId == id) {
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return root;
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}
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for (var i = 0; i < root.children.length; ++i) {
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var subtreeResult = findNode(root.children[i], id);
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if (subtreeResult != null) {
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return subtreeResult;
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}
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}
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return null;
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}
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// Add a child -> parent link to the APZC tree rooted at 'root'.
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function addLink(root, child, parent) {
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var parentNode = findNode(root, parent);
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if (parentNode == null) {
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parentNode = makeNode(parent);
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root.children.push(parentNode);
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}
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parentNode.children.push(makeNode(child));
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}
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// Add a root node to the APZC tree. It will become a direct
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// child of 'root'.
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function addRoot(root, id) {
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root.children.push(makeNode(id));
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}
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// Given APZ test data for a single paint on the compositor side,
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// reconstruct the APZC tree structure from the 'parentScrollId'
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// entries that were logged.
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function buildApzcTree(paint) {
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// The APZC tree can potentially have multiple root nodes,
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// so we invent a node that is the parent of all roots.
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// This 'root' does not correspond to an APZC.
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var root = makeNode(-1);
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for (var scrollId in paint) {
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if ("parentScrollId" in paint[scrollId]) {
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addLink(root, scrollId, paint[scrollId]["parentScrollId"]);
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} else {
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addRoot(root, scrollId);
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}
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}
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return root;
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}
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// --------------------------------------------------------------------
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// The actual logic for testing bug 982141.
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//
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// In this test we have a simple page with a scrollable <div> which has
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// enough content to make it scrollable. We test that this <div> got
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// a displayport.
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// --------------------------------------------------------------------
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function testBug982141() {
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// Get the content- and compositor-side test data from nsIDOMWindowUtils.
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var contentTestData = utils.getContentAPZTestData();
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var compositorTestData = utils.getCompositorAPZTestData();
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// Get the sequence number of the last paint on the compositor side.
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// We do this before converting the APZ test data because the conversion
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// loses the order of the paints.
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SimpleTest.ok(compositorTestData.paints.length > 0,
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"expected at least one paint in compositor test data");
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var lastCompositorPaint = compositorTestData.paints[compositorTestData.paints.length - 1];
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var lastCompositorPaintSeqNo = lastCompositorPaint.sequenceNumber;
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// Convert the test data into a representation that's easier to navigate.
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contentTestData = convertTestData(contentTestData);
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compositorTestData = convertTestData(compositorTestData);
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// Reconstruct the APZC tree structure in the last paint.
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var apzcTree = buildApzcTree(compositorTestData.paints[lastCompositorPaintSeqNo]);
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// The apzc tree for this page should consist of a single root APZC
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// and a child APZC for the scrollable <div>.
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SimpleTest.is(apzcTree.children.length, 1, "expected a single root APZC");
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var rootApzc = apzcTree.children[0];
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SimpleTest.is(rootApzc.children.length, 1, "expected a single child APZC");
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var childScrollId = rootApzc.children[0].scrollId;
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// We should have content-side data for the same paint.
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SimpleTest.ok(lastCompositorPaintSeqNo in contentTestData.paints,
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"expected a content paint with sequence number" + lastCompositorPaintSeqNo);
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var correspondingContentPaint = contentTestData.paints[lastCompositorPaintSeqNo];
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// This content-side data should have a displayport for our scrollable <div>.
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SimpleTest.ok(childScrollId in correspondingContentPaint,
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"expected scroll frame data for scroll id " + childScrollId);
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SimpleTest.ok("displayport" in correspondingContentPaint[childScrollId],
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"expected a displayport for scroll id " + childScrollId);
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var childDisplayport = correspondingContentPaint[childScrollId]["displayport"];
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var dpFields = childDisplayport.replace(/[()\s]+/g, '').split(',');
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SimpleTest.is(dpFields.length, 4, "expected displayport string of form (x,y,w,h)");
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var dpWidth = dpFields[2];
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var dpHeight = dpFields[3];
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SimpleTest.ok(dpWidth >= 50 && dpHeight >= 50,
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"expected a displayport at least as large as the scrollable element");
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window.opener.finishTest();
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}
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</script>
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</head>
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<body style="overflow: hidden;"><!-- Make sure the root frame is not scrollable -->
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=982141">Mozilla Bug 982141</a>
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<!-- A scrollable subframe, with enough content to make it have a nonzero scroll range -->
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<div style="height: 50px; width: 50px; overflow: scroll">
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Line 1<br>
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Line 2<br>
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Line 3<br>
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Line 4<br>
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Line 5<br>
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Line 6<br>
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Line 7<br>
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Line 8<br>
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Line 9<br>
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Line 10<br>
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Line 11<br>
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Line 12<br>
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Line 13<br>
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Line 14<br>
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Line 15<br>
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Line 16<br>
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Line 17<br>
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Line 18<br>
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Line 19<br>
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Line 20<br>
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Line 21<br>
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Line 22<br>
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Line 23<br>
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Line 24<br>
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Line 25<br>
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Line 26<br>
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Line 27<br>
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Line 28<br>
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Line 29<br>
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Line 30<br>
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Line 31<br>
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Line 32<br>
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Line 33<br>
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Line 34<br>
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Line 35<br>
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Line 36<br>
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Line 37<br>
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Line 38<br>
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Line 39<br>
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Line 40<br>
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Line 41<br>
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Line 42<br>
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Line 43<br>
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Line 44<br>
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Line 45<br>
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Line 46<br>
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Line 40<br>
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Line 48<br>
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Line 49<br>
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Line 50<br>
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</div>
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</body>
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</html>
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