Implement round-rect clipping on video elements
https://bugs.webkit.org/show_bug.cgi?id=138537
rdar://problem/9534399

Reviewed by Darin Adler.
Source/WebCore:

Support border-radius on video and other layers with composited contents,
by pushing a FloatRoundedRect onto the GraphicsLayer as the contentsClippingRect,
and, on Mac, using layer corner-radius or a CAShapeLayer mask.

Test: compositing/video/video-border-radius.html

* WebCore.exp.in:
* platform/graphics/FloatRoundedRect.cpp:
(WebCore::FloatRoundedRect::Radii::isUniformCornerRadius): Returns true if all
corner radii are the same, and have equal widths and heights.
* platform/graphics/FloatRoundedRect.h: Allow construction without an explicit
rect.
* platform/graphics/GraphicsLayer.cpp:
(WebCore::GraphicsLayer::GraphicsLayer): nullptr goodness.
(showGraphicsLayerTree): Print contents layers when debugging.
* platform/graphics/GraphicsLayer.h:
(WebCore::GraphicsLayer::contentsClippingRect): Make this take a FloatRoundedRect.
(WebCore::GraphicsLayer::setContentsClippingRect):
* platform/graphics/ca/GraphicsLayerCA.cpp:
(WebCore::GraphicsLayerCA::setContentsClippingRect):
(WebCore::GraphicsLayerCA::setContentsToSolidColor):
(WebCore::GraphicsLayerCA::setContentsToImage):
(WebCore::GraphicsLayerCA::setContentsToPlatformLayer):
(WebCore::GraphicsLayerCA::commitLayerChangesBeforeSublayers):
(WebCore::GraphicsLayerCA::updateClippingStrategy): Determines whether we can simply
use corner-radius on the existing contentsClippingLayer, or whether we have to
create a shape layer to use as a mask.
(WebCore::GraphicsLayerCA::updateContentsRects): We have to add/remove the shape layer
based on the rounded rect radii. Calls updateClippingStrategy() on the clipping layer,
and also updates clones accordingly.
(WebCore::dumpInnerLayer):
(WebCore::GraphicsLayerCA::dumpAdditionalProperties): Dump all the inner layers
(requiring on test rebaseline), including the new shape and backdrop layers.
* platform/graphics/ca/GraphicsLayerCA.h:
* platform/graphics/ca/PlatformCALayer.h: Add a new shape layer type.
* platform/graphics/ca/mac/PlatformCALayerMac.h: Support for corner radius and
a rounded rect shape mask.
* platform/graphics/ca/mac/PlatformCALayerMac.mm:
(PlatformCALayerMac::PlatformCALayerMac):
(PlatformCALayerMac::clone):
(PlatformCALayerMac::setMask):
(PlatformCALayerMac::cornerRadius):
(PlatformCALayerMac::setCornerRadius):
(PlatformCALayerMac::shapeRoundedRect):
(PlatformCALayerMac::setShapeRoundedRect):
* platform/graphics/ca/win/PlatformCALayerWin.cpp:
(PlatformCALayerWin::cornerRadius):
(PlatformCALayerWin::setCornerRadius):
(PlatformCALayerWin::shapeRoundedRect):
(PlatformCALayerWin::setShapeRoundedRect):
* platform/graphics/ca/win/PlatformCALayerWin.h:
* rendering/RenderLayerBacking.cpp:
(WebCore::RenderLayerBacking::resetContentsRect): Use getRoundedInnerBorderFor() to get
the rounded rect used to clip contents.
(WebCore::RenderLayerBacking::positionOverflowControlsLayers): Push a FloatRoundedRect for the contents clip,
(WebCore::RenderLayerBacking::updateDirectlyCompositedBackgroundColor): Ditto.
(WebCore::RenderLayerBacking::updateDirectlyCompositedBackgroundImage): Ditto.
(WebCore::RenderLayerBacking::updateImageContents): Get the rounded rect clip.
* rendering/RenderLayerBacking.h: nullptr.

Source/WebKit2:

Support border-radius on video and other layers with composited contents,
by pushing a FloatRoundedRect onto the GraphicsLayer as the contentsClippingRect,
and, on Mac, using layer corner-radius or a CAShapeLayer mask.

* Shared/WebCoreArgumentCoders.cpp:
(IPC::ArgumentCoder<FloatRoundedRect>::encode):
(IPC::ArgumentCoder<FloatRoundedRect>::decode):
* Shared/WebCoreArgumentCoders.h:
* Shared/mac/RemoteLayerBackingStore.mm: New shape layer type.
(WebKit::RemoteLayerBackingStore::drawInContext):
* Shared/mac/RemoteLayerTreePropertyApplier.mm:
(WebKit::applyPropertiesToLayer): Apply corner-radius and shape path.
* Shared/mac/RemoteLayerTreeTransaction.h: Prettify the flags. Yes, I prefer this style.
* Shared/mac/RemoteLayerTreeTransaction.mm:
(WebKit::RemoteLayerTreeTransaction::LayerProperties::LayerProperties):
(WebKit::RemoteLayerTreeTransaction::LayerProperties::encode):
(WebKit::RemoteLayerTreeTransaction::LayerProperties::decode):
(WebKit::RemoteLayerTreeTextStream::operator<<):
(WebKit::dumpChangedLayers):
(WebKit::RemoteLayerTreeTransaction::description):
* UIProcess/ios/RemoteLayerTreeHostIOS.mm:
(+[WKShapeView layerClass]): Make UIViews with a CAShapeLayer layer class.
(WebKit::RemoteLayerTreeHost::createLayer):
* UIProcess/mac/RemoteLayerTreeHost.mm:
(WebKit::RemoteLayerTreeHost::createLayer):
* WebProcess/WebPage/mac/PlatformCALayerRemote.cpp:
(WebKit::PlatformCALayerRemote::updateClonedLayerProperties):
(WebKit::isEquivalentLayer):
(WebKit::PlatformCALayerRemote::setMask):
(WebKit::PlatformCALayerRemote::setClonedLayer):
(WebKit::PlatformCALayerRemote::cornerRadius):
(WebKit::PlatformCALayerRemote::setCornerRadius):
(WebKit::PlatformCALayerRemote::shapeRoundedRect):
(WebKit::PlatformCALayerRemote::setShapeRoundedRect):
* WebProcess/WebPage/mac/PlatformCALayerRemote.h:

LayoutTests:

Test that uses clip() to compare a bit of rounded-rect video in the corner.
Rebaselined test that dumped contents layers.

* compositing/video/video-border-radius-expected.html: Added.
* compositing/video/video-border-radius.html: Added.
* platform/mac/compositing/reflections/direct-image-object-fit-reflected-expected.txt:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@175794 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Put bug link at the start of the line.

* platform/mac-wk2/TestExpectations:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@175795 268f45cc-cd09-0410-ab3c-d52691b4dbfc