[Webkit-unassigned] [Bug 118066] New: [SVG] Speed up SVG sprites by only painting the source rect in SVGImage::draw

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=118066

           Summary: [SVG] Speed up SVG sprites by only painting the source
                    rect in SVGImage::draw
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: SVG
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: svillar at igalia.com
                CC: zimmermann at kde.org


We should probably merge:

Speed up SVG sprites by only painting the source rect in SVGImage::draw

Previously we painted an entire SVG sprite image, even if only a small
region was needed. This patch fixes this mistake by only painting
the minimum required area.

This patch takes a high-profile SVG scroll demo by adrianosmond from
around ~10fps to 30+fps. A minimized example of this bug is at:
philbit.com/sprites2.html (improved from less than 1fps to 30+fps)

BUG=253091
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=153069

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