[Webkit-unassigned] [Bug 190513] [Cairo] Incorrect rendering for 135-deg skews

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190513

--- Comment #4 from Yoshiaki Jitsukawa <yoshiaki.jitsukawa at sony.com> ---
Provided R=(ctm.xx, ctm.xy, ctm.yx, ctm.yy), T=(ctm.x0, ctm.y0), D=(-dx, -dy),
the translation components (x0, y0) after cairo_translate(-dx, -dy) will be
 (x0, y0) = R*D + T
so D to zero (x0, y0) is:
 D = -R^-1* T

With (xy = 0, yx = 0), D is:
 D = -(x0, y0) * (yy, xx) / det: where det = xx * yy
so
 (dx, dy) = (x0 / xx, y0 / yy)

This is the same result as before.

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