fix box shadows

fix box shadows

We need to apply the context transform to the shadow before
rendering it.  There's also a weird case where we have to
flip the y offset if we're not applying the transform.  I'm
not sure why this is necessary, but it allows us to pass
canvas-shadow tests.

BUG=5503

[brettw, 2008-12-15 19:58:49]

LGTM

http://codereview.chromium.org/14125/diff/215/28
File webkit/port/platform/graphics/skia/GraphicsContextSkia.cpp (right):

http://codereview.chromium.org/14125/diff/215/28#newcode952
Line 952: double eigenvalue = sqrt(0.5 * ((a + d) - sqrt(4 * b * c + (a - d) *
(a - d))));
Eigenvalues... hard core!

[tony, 2008-12-15 20:31:09]

On 2008/12/15 19:58:49, brettw wrote:
> LGTM
> 
> http://codereview.chromium.org/14125/diff/215/28
> File webkit/port/platform/graphics/skia/GraphicsContextSkia.cpp (right):
> 
> http://codereview.chromium.org/14125/diff/215/28#newcode952
> Line 952: double eigenvalue = sqrt(0.5 * ((a + d) - sqrt(4 * b * c + (a - d) *
> (a - d))));
> Eigenvalues... hard core!

I'm just copying code from the CG port :)