[Webkit-unassigned] [Bug 58567] invert is treated like currentColor

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=58567





--- Comment #6 from David Barr <davidbarr at chromium.org>  2011-05-29 18:11:56 PST ---
(From update of attachment 95311)
View in context: https://bugs.webkit.org/attachment.cgi?id=95311&action=review

OpenVG appears to be the only drawing API that doesn't have the required blend mode.

> Source/WebCore/platform/graphics/gpu/SharedGraphicsContext3D.cpp:348
> +        m_context->disable(GraphicsContext3D::BLEND);

Alternatively, something like:
m_context->enable(GraphicsContext3D::BLEND);
m_context->blendEquation(GraphicsContext3D::FUNC_SUBTRACT);
m_context->blendFunc(GraphicsContext3D::ONE, GraphicsContext3D::ONE);

> Source/WebCore/platform/graphics/openvg/PainterOpenVG.cpp:289
> +            notImplemented();

As best I can tell, there is no subtraction filter available in the OpenVG API.

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