[Webkit-unassigned] [Bug 43069] New: The SVG filter infrastructure can't handle zero-sized images

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=43069

           Summary: The SVG filter infrastructure can't handle zero-sized
                    images
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P3
         Component: SVG
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ctruta at chromium.org
                CC: zimmermann at kde.org


Currently, SVG filters and filter effects rely on the underlying graphics' capability to handle zero-sized images. This is required by tests like
svg/filters/filter-empty-g.svg

Unfortunately, this is supported inconsistently, or not at all, across the various underlying graphics engines (CG, Skia, Windows GDI, etc.)
Various workarounds currently exist. For example, on Windows, an underlying 1x1 image is created; see BitmapPlatformDevice::create inside skia/ext/bitmap_platform_device_win.cc

However, a more uniform, higher-level solution is necessary.

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