[Webkit-unassigned] [Bug 16171] [CAIRO] Canvas does not support globalAlpha

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=16171





------- Comment #4 from eric at webkit.org  2008-08-30 12:14 PDT -------
The problem with adding a getAlpha() getter is that CG will have trouble
supporting that API.

void GraphicsContext::setAlpha(float alpha)
{
    if (paintingDisabled())
        return;
    CGContextSetAlpha(platformContext(), alpha);
}

There is no corresponding CGContextGetAlpha() (that I know of).

so either we'd need to move to a model where GraphicsContext stored the alpha
in the GraphicsContextState, or getAlpha() would need to be cairo only for now.


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