2011-01-12 Chris Marrin <cmarrin@apple.com>
Reviewed by Simon Fraser.
Pages with accelerated layers lose subpixel-AA and become blurry when a scale factor is applied
rdar://problem/8824974
When scaled, WebKit renders the page content at the scaled up size, so there are no
scaling artifacts. But content drawn into a layer's backing store does not scale up.
This is made worse by the fact that the root page contents become layered when there
are other accelerated compositing layers present (video, plugins, etc.).
Plumb scaling factor from Frame::scalePage() down into all layers with content. It
eventually calls CALayer::setContentsScale which renders to a backing store whose dimensions
are scaled, causing them to render larger and appear pixel perfect at the scaled
page size.
* page/Frame.cpp:
(WebCore::Frame::updateContentsScale):
(WebCore::Frame::scalePage):
* page/Frame.h:
* platform/graphics/GraphicsLayer.h:
* platform/graphics/ca/GraphicsLayerCA.cpp:
(WebCore::GraphicsLayerCA::setContentsScale):
(WebCore::GraphicsLayerCA::clampedContentsScaleForScale):
* platform/graphics/ca/GraphicsLayerCA.h:
(WebCore::GraphicsLayerCA::contentsScale):
* platform/graphics/ca/PlatformCALayer.h:
* platform/graphics/ca/mac/PlatformCALayerMac.mm:
(PlatformCALayer::contentsScale):
(PlatformCALayer::setContentsScale):
* rendering/RenderLayer.cpp:
(WebCore::RenderLayer::updateContentsScale):
* rendering/RenderLayer.h:
* rendering/RenderLayerBacking.cpp:
(WebCore::RenderLayerBacking::createGraphicsLayer):
(WebCore::RenderLayerBacking::updateForegroundLayer):
(WebCore::RenderLayerBacking::updateMaskLayer):
(WebCore::RenderLayerBacking::updateContentsScale):
* rendering/RenderLayerBacking.h:
* rendering/RenderLayerCompositor.cpp:
(WebCore::RenderLayerCompositor::updateContentsScale):
* rendering/RenderLayerCompositor.h:
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@75639 268f45cc-cd09-0410-ab3c-d52691b4dbfc
14 files changed
