[Libreoffice-bugs] [Bug 127437] FILEOPEN PPTX Rotated text in shape is imported wrongly

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=127437

--- Comment #1 from Regina Henschel <rb.henschel at t-online.de> ---
The rotation angle is put into TextPreRotateAngle. That results in a
matrix-multiplication order scale-matrix * rotation-matrix in
ViewContactOfSdrObjCustomShape::createViewIndependentPrimitive2DSequence().
The decompose algorithm in B2DHomMatrix::decompose uses the column-vectors to
detect shear. With this multiplication order the column-vectors are not
orthogonal, and thus results in a shear angle.

If the rotation angle is put into TextRotateAngle, then the
matrix-multiplication order is rotation-matrix * scale-matrix. Then the
column-vectors are orthogonal and shear angle is zero.

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