[Webkit-unassigned] [Bug 190615] New: Tiling CSS gradients is slow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190615

            Bug ID: 190615
           Summary: Tiling CSS gradients is slow
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: koivisto at iki.fi

Painting blocks the main thread on CG rendering queue to make copy of the backing store:

kevent_id
_dispatch_event_loop_wait_for_ownership
__DISPATCH_WAIT_FOR_QUEUE__
_dispatch_sync_f_slow
CA::CG::IOSurfaceDrawable::copy_cgimage()
WebCore::IOSurface::createImage()
WebCore::ImageBuffer::copyNativeImage(WebCore::BackingStoreCopy) const
WebCore::ImageBuffer::copyImage(WebCore::BackingStoreCopy, WebCore::PreserveResolution) const
WebCore::ImageBuffer::drawPattern(WebCore::GraphicsContext&, WebCore::FloatRect const&, WebCore::FloatRect const&, WebCore::AffineTransform const&, WebCore::FloatPoint const&, WebCore::FloatSize const&, WebCore::CompositeOperator, WebCore::BlendMode)
WebCore::GradientImage::drawPattern(WebCore::GraphicsContext&, WebCore::FloatRect const&, WebCore::FloatRect const&, WebCore::AffineTransform const&, WebCore::FloatPoint const&, WebCore::FloatSize const&, WebCore::CompositeOperator, WebCore::BlendMode)
WebCore::Image::drawTiled(WebCore::GraphicsContext&, WebCore::FloatRect const&, WebCore::FloatPoint const&, WebCore::FloatSize const&, WebCore::FloatSize const&, WebCore::CompositeOperator, WebCore::BlendMode, WebCore::DecodingMode)

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