https://bugs.webkit.org/show_bug.cgi?id=67415

https://bugs.webkit.org/show_bug.cgi?id=67415
Text drawn via -webkit-background-clip:text is blurry at device scale factors >1.0
-and corresponding-
<rdar://problem/10060379>

Reviewed by Darin Adler.

New helper function RenderBoxModelObject scales the mask image by the
deviceScaleFactor to get an image of the appropriate resolution. It also scales
the image's GraphicsContext so that the clip is set up on the same scale. Back in
paintFillLayerExtended() we still clip the image to the original maskRect to get
everything scaled back to the appropriate size.
* rendering/RenderBoxModelObject.cpp:
(WebCore::createDeviceScaledImageBuffer):
(WebCore::RenderBoxModelObject::paintFillLayerExtended):

Make the deviceScaleFactor convenience function just a namespace-level function in
Page rather than a static member or Page.
* page/Page.cpp:
(WebCore::deviceScaleFactor):
* page/Page.h:

Pre-existing callers of Page::deviceScaleFactor(Frame*) must now use
WebCore::deviceScaleFactor(Frame*)
* editing/DeleteButtonController.cpp:
(WebCore::DeleteButtonController::createDeletionUI):
* rendering/RenderImage.cpp:
(WebCore::RenderImage::imageSizeForError):
(WebCore::RenderImage::paintReplaced):
* rendering/RenderLayer.cpp:
(WebCore::RenderLayer::drawPlatformResizerImage):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@95697 268f45cc-cd09-0410-ab3c-d52691b4dbfc