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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/165540">165540</a></dd>
<dt>Author</dt> <dd>ossy@webkit.org</dd>
<dt>Date</dt> <dd>2014-03-13 09:42:27 -0700 (Thu, 13 Mar 2014)</dd>
</dl>
<h3>Log Message</h3>
<pre>Subpixel rendering: Nested layers with subpixel accumulation paint to wrong position.
https://bugs.webkit.org/show_bug.cgi?id=130153
Patch by Zalan Bujtas <zalan@apple.com> on 2014-03-13
Reviewed by Simon Fraser.
Subpixels (fractional device pixels here) can accumulate through nested layers. Subpixels
need to be propagated through the layer tree so that painting coordinates match layout coordinates.
Compositing case: (absolute positioning, 2x display)
parent layer pos(0.3, 0.3) -> floored painting position (0, 0)
child layer pos(10.2, 10.2) -> layout offset from parent (10.2, 10.2),
but the actual painting offset is (10.5, 10.5) as the result of parent flooring.
Non-compositing case: (absolute positioning, 2x display)
parent layer pos(0.3, 0.3) -> GraphicsContext is translated to (0, 0).
child layer pos(10.2, 10.2) -> layout offset from parent (10.2, 10.2)
but the GraphicsContext's offset is (10.5, 10.5) as the result of the parent's translate.
In both cases, without the subpixel adjustment, we'd paint the current layer at (10.0, 10.0)
after flooring, while its painting position is actually (10.5, 10.5).
Subpixels do accumulate through nested layers.
Source/WebCore:
Tests: compositing/hidpi-nested-compositing-layers-with-subpixel-accumulation.html
fast/layers/hidpi-nested-layers-with-subpixel-accumulation.html
* rendering/RenderLayer.cpp:
(WebCore::RenderLayer::paintLayerByApplyingTransform):
* rendering/RenderLayerBacking.cpp:
(WebCore::RenderLayerBacking::updateGraphicsLayerGeometry):
* rendering/RenderLayerBacking.h:
(WebCore::RenderLayerBacking::devicePixelFractionFromRenderer):
LayoutTests:
* compositing/hidpi-nested-compositing-layers-with-subpixel-accumulation-expected.html: Added.
* compositing/hidpi-nested-compositing-layers-with-subpixel-accumulation.html: Added.
* fast/layers/hidpi-nested-layers-with-subpixel-accumulation-expected.html: Added.
* fast/layers/hidpi-nested-layers-with-subpixel-accumulation.html: Added.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsChangeLog">trunk/LayoutTests/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCorerenderingRenderLayercpp">trunk/Source/WebCore/rendering/RenderLayer.cpp</a></li>
<li><a href="#trunkSourceWebCorerenderingRenderLayerBackingcpp">trunk/Source/WebCore/rendering/RenderLayerBacking.cpp</a></li>
<li><a href="#trunkSourceWebCorerenderingRenderLayerBackingh">trunk/Source/WebCore/rendering/RenderLayerBacking.h</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunkLayoutTestscompositinghidpinestedcompositinglayerswithsubpixelaccumulationexpectedhtml">trunk/LayoutTests/compositing/hidpi-nested-compositing-layers-with-subpixel-accumulation-expected.html</a></li>
<li><a href="#trunkLayoutTestscompositinghidpinestedcompositinglayerswithsubpixelaccumulationhtml">trunk/LayoutTests/compositing/hidpi-nested-compositing-layers-with-subpixel-accumulation.html</a></li>
<li><a href="#trunkLayoutTestsfastlayershidpinestedlayerswithsubpixelaccumulationexpectedhtml">trunk/LayoutTests/fast/layers/hidpi-nested-layers-with-subpixel-accumulation-expected.html</a></li>
<li><a href="#trunkLayoutTestsfastlayershidpinestedlayerswithsubpixelaccumulationhtml">trunk/LayoutTests/fast/layers/hidpi-nested-layers-with-subpixel-accumulation.html</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (165539 => 165540)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog 2014-03-13 16:39:53 UTC (rev 165539)
+++ trunk/LayoutTests/ChangeLog 2014-03-13 16:42:27 UTC (rev 165540)
</span><span class="lines">@@ -1,3 +1,32 @@
</span><ins>+2014-03-13 Zalan Bujtas <zalan@apple.com>
+
+ Subpixel rendering: Nested layers with subpixel accumulation paint to wrong position.
+ https://bugs.webkit.org/show_bug.cgi?id=130153
+
+ Reviewed by Simon Fraser.
+
+ Subpixels (fractional device pixels here) can accumulate through nested layers. Subpixels
+ need to be propagated through the layer tree so that painting coordinates match layout coordinates.
+
+ Compositing case: (absolute positioning, 2x display)
+ parent layer pos(0.3, 0.3) -> floored painting position (0, 0)
+ child layer pos(10.2, 10.2) -> layout offset from parent (10.2, 10.2),
+ but the actual painting offset is (10.5, 10.5) as the result of parent flooring.
+
+ Non-compositing case: (absolute positioning, 2x display)
+ parent layer pos(0.3, 0.3) -> GraphicsContext is translated to (0, 0).
+ child layer pos(10.2, 10.2) -> layout offset from parent (10.2, 10.2)
+ but the GraphicsContext's offset is (10.5, 10.5) as the result of the parent's translate.
+
+ In both cases, without the subpixel adjustment, we'd paint the current layer at (10.0, 10.0)
+ after flooring, while its painting position is actually (10.5, 10.5).
+ Subpixels do accumulate through nested layers.
+
+ * compositing/hidpi-nested-compositing-layers-with-subpixel-accumulation-expected.html: Added.
+ * compositing/hidpi-nested-compositing-layers-with-subpixel-accumulation.html: Added.
+ * fast/layers/hidpi-nested-layers-with-subpixel-accumulation-expected.html: Added.
+ * fast/layers/hidpi-nested-layers-with-subpixel-accumulation.html: Added.
+
</ins><span class="cx"> 2014-03-13 Andres Gomez <agomez@igalia.com>
</span><span class="cx">
</span><span class="cx"> [GStreamer] WebKit gets stalled when trying to play a stream
</span></span></pre></div>
<a id="trunkLayoutTestscompositinghidpinestedcompositinglayerswithsubpixelaccumulationexpectedhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/compositing/hidpi-nested-compositing-layers-with-subpixel-accumulation-expected.html (0 => 165540)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/compositing/hidpi-nested-compositing-layers-with-subpixel-accumulation-expected.html (rev 0)
+++ trunk/LayoutTests/compositing/hidpi-nested-compositing-layers-with-subpixel-accumulation-expected.html 2014-03-13 16:42:27 UTC (rev 165540)
</span><span class="lines">@@ -0,0 +1,32 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+<title>This tests that nested compositing layers with subpixel accumulation paint to the same position as regular, non-compositing content.</title>
+<style>
+ div {
+ width: 5px;
+ height: 2px;
+ left: 0px;
+ position: absolute;
+ }
+</style>
+</head>
+<body>
+<p id="container"></p>
+<script>
+ left = 0;
+ for (i = 0; i < 10; ++i, left+=6.3) {
+ var container = document.getElementById("container");
+ for (j = 0; j < 50; ++j) {
+ var e = document.createElement("div");
+ e.style.top = "1.3px";
+ if (j == 0)
+ e.style.left = left + "px";
+ e.style.backgroundColor = "rgb(0, 0, " + (j * 4) + ")";
+ container.appendChild(e);
+ container = e;
+ }
+ }
+</script>
+</body>
+</html>
</ins></span></pre></div>
<a id="trunkLayoutTestscompositinghidpinestedcompositinglayerswithsubpixelaccumulationhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/compositing/hidpi-nested-compositing-layers-with-subpixel-accumulation.html (0 => 165540)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/compositing/hidpi-nested-compositing-layers-with-subpixel-accumulation.html (rev 0)
+++ trunk/LayoutTests/compositing/hidpi-nested-compositing-layers-with-subpixel-accumulation.html 2014-03-13 16:42:27 UTC (rev 165540)
</span><span class="lines">@@ -0,0 +1,33 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+<title>This tests that nested compositing layers with subpixel accumulation paint to the same position as regular, non-compositing content.</title>
+<style>
+ div {
+ width: 5px;
+ height: 2px;
+ left: 0px;
+ position: absolute;
+ -webkit-transform: translateZ(0);
+ }
+</style>
+</head>
+<body>
+<p id="container"></p>
+<script>
+ left = 0;
+ for (i = 0; i < 10; ++i, left+=6.3) {
+ var container = document.getElementById("container");
+ for (j = 0; j < 50; ++j) {
+ var e = document.createElement("div");
+ e.style.top = "1.3px";
+ if (j == 0)
+ e.style.left = left + "px";
+ e.style.backgroundColor = "rgb(0, 0, " + (j * 4) + ")";
+ container.appendChild(e);
+ container = e;
+ }
+ }
+</script>
+</body>
+</html>
</ins></span></pre></div>
<a id="trunkLayoutTestsfastlayershidpinestedlayerswithsubpixelaccumulationexpectedhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/layers/hidpi-nested-layers-with-subpixel-accumulation-expected.html (0 => 165540)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/layers/hidpi-nested-layers-with-subpixel-accumulation-expected.html (rev 0)
+++ trunk/LayoutTests/fast/layers/hidpi-nested-layers-with-subpixel-accumulation-expected.html 2014-03-13 16:42:27 UTC (rev 165540)
</span><span class="lines">@@ -0,0 +1,32 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+<title>This tests that nested non-compositing layers with subpixel accumulation paint to the same position as regular content.</title>
+<style>
+ div {
+ width: 5px;
+ height: 2px;
+ left: 0px;
+ position: absolute;
+ }
+</style>
+</head>
+<body>
+<p id="container"></p>
+<script>
+ left = 0;
+ for (i = 0; i < 10; ++i, left+=6.3) {
+ var container = document.getElementById("container");
+ for (j = 0; j < 50; ++j) {
+ var e = document.createElement("div");
+ e.style.top = "1.3px";
+ if (j == 0)
+ e.style.left = left + "px";
+ e.style.backgroundColor = "rgb(0, 0, " + (j * 4) + ")";
+ container.appendChild(e);
+ container = e;
+ }
+ }
+</script>
+</body>
+</html>
</ins></span></pre></div>
<a id="trunkLayoutTestsfastlayershidpinestedlayerswithsubpixelaccumulationhtml"></a>
<div class="addfile"><h4>Added: trunk/LayoutTests/fast/layers/hidpi-nested-layers-with-subpixel-accumulation.html (0 => 165540)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/layers/hidpi-nested-layers-with-subpixel-accumulation.html (rev 0)
+++ trunk/LayoutTests/fast/layers/hidpi-nested-layers-with-subpixel-accumulation.html 2014-03-13 16:42:27 UTC (rev 165540)
</span><span class="lines">@@ -0,0 +1,33 @@
</span><ins>+<!DOCTYPE html>
+<html>
+<head>
+<title>This tests that nested non-compositing layers with subpixel accumulation paint to the same position as regular content.</title>
+<style>
+ div {
+ width: 5px;
+ height: 2px;
+ left: 0px;
+ position: absolute;
+ -webkit-transform: rotate(0deg);
+ }
+</style>
+</head>
+<body>
+<p id="container"></p>
+<script>
+ left = 0;
+ for (i = 0; i < 10; ++i, left+=6.3) {
+ var container = document.getElementById("container");
+ for (j = 0; j < 50; ++j) {
+ var e = document.createElement("div");
+ e.style.top = "1.3px";
+ if (j == 0)
+ e.style.left = left + "px";
+ e.style.backgroundColor = "rgb(0, 0, " + (j * 4) + ")";
+ container.appendChild(e);
+ container = e;
+ }
+ }
+</script>
+</body>
+</html>
</ins></span></pre></div>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (165539 => 165540)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2014-03-13 16:39:53 UTC (rev 165539)
+++ trunk/Source/WebCore/ChangeLog 2014-03-13 16:42:27 UTC (rev 165540)
</span><span class="lines">@@ -1,3 +1,37 @@
</span><ins>+2014-03-13 Zalan Bujtas <zalan@apple.com>
+
+ Subpixel rendering: Nested layers with subpixel accumulation paint to wrong position.
+ https://bugs.webkit.org/show_bug.cgi?id=130153
+
+ Reviewed by Simon Fraser.
+
+ Subpixels (fractional device pixels here) can accumulate through nested layers. Subpixels
+ need to be propagated through the layer tree so that painting coordinates match layout coordinates.
+
+ Compositing case: (absolute positioning, 2x display)
+ parent layer pos(0.3, 0.3) -> floored painting position (0, 0)
+ child layer pos(10.2, 10.2) -> layout offset from parent (10.2, 10.2),
+ but the actual painting offset is (10.5, 10.5) as the result of parent flooring.
+
+ Non-compositing case: (absolute positioning, 2x display)
+ parent layer pos(0.3, 0.3) -> GraphicsContext is translated to (0, 0).
+ child layer pos(10.2, 10.2) -> layout offset from parent (10.2, 10.2)
+ but the GraphicsContext's offset is (10.5, 10.5) as the result of the parent's translate.
+
+ In both cases, without the subpixel adjustment, we'd paint the current layer at (10.0, 10.0)
+ after flooring, while its painting position is actually (10.5, 10.5).
+ Subpixels do accumulate through nested layers.
+
+ Tests: compositing/hidpi-nested-compositing-layers-with-subpixel-accumulation.html
+ fast/layers/hidpi-nested-layers-with-subpixel-accumulation.html
+
+ * rendering/RenderLayer.cpp:
+ (WebCore::RenderLayer::paintLayerByApplyingTransform):
+ * rendering/RenderLayerBacking.cpp:
+ (WebCore::RenderLayerBacking::updateGraphicsLayerGeometry):
+ * rendering/RenderLayerBacking.h:
+ (WebCore::RenderLayerBacking::devicePixelFractionFromRenderer):
+
</ins><span class="cx"> 2014-03-13 Radu Stavila <stavila@adobe.com>
</span><span class="cx">
</span><span class="cx"> The scrolledContentOffset method should handle the hasOverflowClip check
</span></span></pre></div>
<a id="trunkSourceWebCorerenderingRenderLayercpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/rendering/RenderLayer.cpp (165539 => 165540)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/rendering/RenderLayer.cpp 2014-03-13 16:39:53 UTC (rev 165539)
+++ trunk/Source/WebCore/rendering/RenderLayer.cpp 2014-03-13 16:42:27 UTC (rev 165540)
</span><span class="lines">@@ -4167,14 +4167,15 @@
</span><span class="cx"> // This involves subtracting out the position of the layer in our current coordinate space, but preserving
</span><span class="cx"> // the accumulated error for sub-pixel layout.
</span><span class="cx"> float deviceScaleFactor = renderer().document().deviceScaleFactor();
</span><del>- LayoutPoint delta;
- convertToLayerCoords(paintingInfo.rootLayer, delta);
- delta.moveBy(translationOffset);
</del><ins>+ LayoutPoint offsetFromParent;
+ convertToLayerCoords(paintingInfo.rootLayer, offsetFromParent);
+ offsetFromParent.moveBy(translationOffset);
</ins><span class="cx"> TransformationMatrix transform(renderableTransform(paintingInfo.paintBehavior));
</span><del>- FloatPoint roundedDelta = roundedForPainting(delta, deviceScaleFactor);
- transform.translateRight(roundedDelta.x(), roundedDelta.y());
- LayoutSize adjustedSubPixelAccumulation = paintingInfo.subPixelAccumulation + (delta - LayoutPoint(roundedDelta));
-
</del><ins>+ FloatPoint devicePixelFlooredOffsetFromParent = flooredForPainting(offsetFromParent, deviceScaleFactor);
+ transform.translateRight(devicePixelFlooredOffsetFromParent.x(), devicePixelFlooredOffsetFromParent.y());
+ // We handle accumulated subpixels through nested layers here. Since the context gets translated with floored device pixel value,
+ // all we need to do is add the difference to the accumulated pixels coming from ancestor layers.
+ LayoutSize adjustedSubPixelAccumulation = paintingInfo.subPixelAccumulation + (offsetFromParent - LayoutPoint(devicePixelFlooredOffsetFromParent));
</ins><span class="cx"> // Apply the transform.
</span><span class="cx"> GraphicsContextStateSaver stateSaver(*context);
</span><span class="cx"> context->concatCTM(transform.toAffineTransform());
</span></span></pre></div>
<a id="trunkSourceWebCorerenderingRenderLayerBackingcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/rendering/RenderLayerBacking.cpp (165539 => 165540)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/rendering/RenderLayerBacking.cpp 2014-03-13 16:39:53 UTC (rev 165539)
+++ trunk/Source/WebCore/rendering/RenderLayerBacking.cpp 2014-03-13 16:42:27 UTC (rev 165540)
</span><span class="lines">@@ -739,6 +739,8 @@
</span><span class="cx">
</span><span class="cx"> LayoutPoint offsetFromParent;
</span><span class="cx"> m_owningLayer.convertToLayerCoords(compAncestor, offsetFromParent, RenderLayer::AdjustForColumns);
</span><ins>+ // Device pixel fractions get accumulated through ancestor layers. Our painting offset is layout offset + parent's painting offset.
+ offsetFromParent = offsetFromParent + (compAncestor ? compAncestor->backing()->devicePixelFractionFromRenderer() : LayoutSize());
</ins><span class="cx"> relativeCompositingBounds.moveBy(offsetFromParent);
</span><span class="cx">
</span><span class="cx"> LayoutRect enclosingRelativeCompositingBounds = LayoutRect(enclosingRectForPainting(relativeCompositingBounds, deviceScaleFactor));
</span></span></pre></div>
<a id="trunkSourceWebCorerenderingRenderLayerBackingh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/rendering/RenderLayerBacking.h (165539 => 165540)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/rendering/RenderLayerBacking.h 2014-03-13 16:39:53 UTC (rev 165539)
+++ trunk/Source/WebCore/rendering/RenderLayerBacking.h 2014-03-13 16:42:27 UTC (rev 165540)
</span><span class="lines">@@ -213,6 +213,8 @@
</span><span class="cx"> void setBlendMode(BlendMode);
</span><span class="cx"> #endif
</span><span class="cx">
</span><ins>+ LayoutSize devicePixelFractionFromRenderer() const { return m_devicePixelFractionFromRenderer; }
+
</ins><span class="cx"> private:
</span><span class="cx"> FloatRect backgroundBoxForPainting() const;
</span><span class="cx">
</span></span></pre>
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