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ivi-shell: Avoid unnecessary scaling of the view transformation matrix

K J Rajendraprasad requested to merge rajendraprasadkj/weston:alpha_blending into master

The opaque region of a weston view is updated only if the alpha value is 1 and the transform matrix is of type WESTON_MATRIX_TRANSFORM_TRANSLATE.

Here opaque region is never updated, as we are performing scaling operations to the view transform matrix(even when the scaling factor is 1), thus changing the matrix type to WESTON_MATRIX_TRANSFORM_SCALE.

Perform scaling of the view transformation matrix only when the scaling factor is non-zero.

Edited by K J Rajendraprasad

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