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| (Empty) | |
| 1 <!DOCTYPE html> |
| 2 |
| 3 <html><head> |
| 4 <style> |
| 5 .filler { |
| 6 background-color: #CC9900; |
| 7 margin: 20px; |
| 8 border-style: solid; |
| 9 border-width: 1px; |
| 10 width: 400px; |
| 11 height: 100px; |
| 12 } |
| 13 |
| 14 .negativechild { |
| 15 z-index: -1; |
| 16 position: relative; |
| 17 } |
| 18 |
| 19 #parentscrollinglayer { |
| 20 background-color: #CC9999; |
| 21 height: 200px; |
| 22 width: 500px; |
| 23 overflow-y: scroll; |
| 24 } |
| 25 |
| 26 #childscrollinglayer { |
| 27 margin: 30px; |
| 28 position: relative; |
| 29 left: 20px; |
| 30 top: 20px; |
| 31 background-color: #990066; |
| 32 height: 200px; |
| 33 width: 300px; |
| 34 overflow-x: scroll; |
| 35 } |
| 36 </style> |
| 37 |
| 38 <script> |
| 39 var debugMode = false; |
| 40 |
| 41 if (window.testRunner) |
| 42 testRunner.dumpAsText(); |
| 43 |
| 44 function write(str) |
| 45 { |
| 46 var pre = document.getElementById('console'); |
| 47 var text = document.createTextNode(str + '\n'); |
| 48 pre.appendChild(text); |
| 49 } |
| 50 |
| 51 function getStackingOrder() |
| 52 { |
| 53 var divElements = []; |
| 54 // Force a style recalc. |
| 55 document.body.offsetTop; |
| 56 |
| 57 var stackingOrder = window.internals.nodesFromRect(document, 100, 75, 200,
200, 200, 200, false, false, false); |
| 58 |
| 59 for (var i = 0; i < stackingOrder.length; ++i) |
| 60 if (stackingOrder[i].nodeName === "DIV") |
| 61 divElements.push(stackingOrder[i]); |
| 62 |
| 63 return divElements; |
| 64 } |
| 65 |
| 66 function getPaintOrder() |
| 67 { |
| 68 var divElementsBeforePromote = []; |
| 69 var divElementsAfterPromote = []; |
| 70 // Force a style recalc. |
| 71 document.body.offsetTop; |
| 72 |
| 73 var paintOrderListBeforePromote = window.internals.paintOrderListBeforePro
mote(document.getElementById('childscrollinglayer')); |
| 74 var paintOrderListAfterPromote = window.internals.paintOrderListAfterPromo
te(document.getElementById('childscrollinglayer')); |
| 75 |
| 76 for (var i = 0; i < paintOrderListBeforePromote.length; ++i) |
| 77 if (paintOrderListBeforePromote[i].nodeName === "DIV") |
| 78 divElementsBeforePromote.push(paintOrderListBeforePromote[i]); |
| 79 |
| 80 for (var i = 0; i < paintOrderListAfterPromote.length; ++i) |
| 81 if (paintOrderListAfterPromote[i].nodeName === "DIV") |
| 82 divElementsAfterPromote.push(paintOrderListAfterPromote[i]); |
| 83 |
| 84 return {"beforePromote": divElementsBeforePromote, |
| 85 "afterPromote": divElementsAfterPromote}; |
| 86 } |
| 87 |
| 88 function comparePaintOrderLists(oldPaintOrder, newPaintOrder) |
| 89 { |
| 90 if (oldPaintOrder.length !== newPaintOrder.length) |
| 91 return false; |
| 92 |
| 93 for (var i = 0; i < oldPaintOrder.length; i++) |
| 94 if (oldPaintOrder[i] !== newPaintOrder[i]) |
| 95 return false; |
| 96 |
| 97 return true; |
| 98 } |
| 99 |
| 100 function compareStackingOrderWithPaintOrder(stackingOrder, paintOrder) |
| 101 { |
| 102 if (debugMode) { |
| 103 write("paint:") |
| 104 for (var i = 0; i < paintOrder.length; i++) |
| 105 write(paintOrder[i].id + " " + paintOrder[i].className + " " + paintOr
der[i].tagName); |
| 106 |
| 107 write("stacking:") |
| 108 for (var i = 0; i < stackingOrder.length; i++) |
| 109 write(stackingOrder[i].id + " " + stackingOrder[i].className + " " + s
tackingOrder[i].tagName); |
| 110 } |
| 111 |
| 112 for (var i = 0, j = 0; i < stackingOrder.length && j < paintOrder.length;
i++) { |
| 113 // Ignore elements with class "filler negativechild". These elements are |
| 114 // irrelevant to stacking order, since they do not overlap with the |
| 115 // elements we care about. They exist in the paint order lists because |
| 116 // they are still descendants of the same stacking context, but they |
| 117 // will not affect visual layout. |
| 118 while (j < paintOrder.length && paintOrder[paintOrder.length - j - 1].cl
assName === "filler negativechild") |
| 119 j++; |
| 120 |
| 121 if (j >= paintOrder.length) |
| 122 break; |
| 123 |
| 124 if (stackingOrder[i] === paintOrder[paintOrder.length - j - 1]) |
| 125 j++; |
| 126 } |
| 127 |
| 128 if (debugMode) |
| 129 write(stackingOrder.length + " " + i + " " + paintOrder.length + " " + j
); |
| 130 |
| 131 return j === paintOrder.length; |
| 132 } |
| 133 |
| 134 function countOccurrencesOfChildScrollingLayerInPaintOrderList(paintOrder) { |
| 135 var childScrollingLayer = document.getElementById('childscrollinglayer'); |
| 136 var occurrenceCount = 0; |
| 137 for (var i = 0; i < paintOrder.length; i++) |
| 138 if (paintOrder[i] === childScrollingLayer) |
| 139 occurrenceCount++; |
| 140 |
| 141 return occurrenceCount; |
| 142 } |
| 143 |
| 144 function doTest() |
| 145 { |
| 146 var parentscrollinglayer = document.getElementById('parentscrollinglayer')
; |
| 147 var childscrollinglayer = document.getElementById('childscrollinglayer'); |
| 148 |
| 149 if (window.internals) { |
| 150 // Here we want to compare paint order lists before and after promotion |
| 151 // to the actual stacking order as determined by hit-testing. So we |
| 152 // first force the element not to promote, then compute its paint and |
| 153 // stacking order lists. We then force the element to opt in, and |
| 154 // generate the paint and stacking order lists after opt-in. |
| 155 // |
| 156 // The paint order lists should exactly match the stacking order lists |
| 157 // (modulo children that fall outside of the hit-testing area |
| 158 // on-screen), both before and after promotion. |
| 159 parentscrollinglayer.style.webkitTransform = 'translateZ(0px)'; |
| 160 document.body.offsetTop; |
| 161 |
| 162 window.internals.settings.setAcceleratedCompositingForOverflowScrollEnab
led(false); |
| 163 parentscrollinglayer.style.webkitTransform = ''; |
| 164 |
| 165 var oldStackingOrder = getStackingOrder(); |
| 166 var oldPaintOrder = getPaintOrder(); |
| 167 |
| 168 window.internals.settings.setAcceleratedCompositingForOverflowScrollEnab
led(true); |
| 169 parentscrollinglayer.style.webkitTransform = 'translateZ(0px)'; |
| 170 |
| 171 var newStackingOrder = getStackingOrder(); |
| 172 var newPaintOrder = getPaintOrder(); |
| 173 |
| 174 // The getPaintOrder() function should return a pair of paint orders. |
| 175 // One before promotion and one after. This pair of lists should remain |
| 176 // identical whether the element is actually currently promoted or not, |
| 177 // its purpose is to generate hypothetical pre- and post-lists to |
| 178 // determine if the element is promotable. |
| 179 if (!comparePaintOrderLists(oldPaintOrder, newPaintOrder)) |
| 180 write("FAIL - paint order lists not identical before/after promotion")
; |
| 181 |
| 182 if (!compareStackingOrderWithPaintOrder(oldStackingOrder, oldPaintOrder.
beforePromote)) |
| 183 write("FAIL - paint order list before promote doesn't match stacking o
rder"); |
| 184 |
| 185 if (!compareStackingOrderWithPaintOrder(newStackingOrder, oldPaintOrder.
afterPromote)) |
| 186 write("FAIL - paint order list after promote doesn't match stacking or
der"); |
| 187 |
| 188 var childScrollingLayerOccurrences = countOccurrencesOfChildScrollingLay
erInPaintOrderList(oldPaintOrder.beforePromote); |
| 189 if (childScrollingLayerOccurrences !== 1) |
| 190 write("FAIL - paint order list before promote contains " + childScroll
ingLayerOccurrences + " occurrences of child scrolling layer. Should be exactly
1."); |
| 191 |
| 192 childScrollingLayerOccurrences = countOccurrencesOfChildScrollingLayerIn
PaintOrderList(oldPaintOrder.afterPromote); |
| 193 if (childScrollingLayerOccurrences !== 1) |
| 194 write("FAIL - paint order list after promote contains " + childScrolli
ngLayerOccurrences + " occurrences of child scrolling layer. Should be exactly 1
."); |
| 195 |
| 196 write("PASS - did not crash."); |
| 197 } |
| 198 } |
| 199 |
| 200 window.addEventListener('load', doTest, false); |
| 201 </script> |
| 202 </head> |
| 203 <body> |
| 204 <div class="filler"></div> |
| 205 <div id="parentscrollinglayer"> |
| 206 <div id="childscrollinglayer"> |
| 207 <div class="filler"></div> |
| 208 </div> |
| 209 <div class="filler"></div> |
| 210 <div class="filler"></div> |
| 211 </div> |
| 212 <div id="fillerchild1" class="filler negativechild"></div> |
| 213 <div id="fillerchild2" class="filler negativechild"></div> |
| 214 <div id="fillerchild3" class="filler negativechild"></div> |
| 215 <div id="fillerchild4" class="filler negativechild"></div> |
| 216 <pre id="console"></pre> |
| 217 </body> |
| 218 </html> |
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Chromium Code Reviews
Issue 13467028:
Add an intermediate function to generate 2 paint-order lists. (Closed)
Base URL: svn://svn.chromium.org/blink/trunk