how does the renderer->matrix take effect, when pango using xft backend?

[王旭光 <ninesunqian 163 com>]

when I use pango in windows, the matrix takes effect by "SetWorldTransform (hdc, &xForm)".
but I can't find how the matrix take effect in xft backend. I using gdb "watch renderer->matrix", I only have seen pango_renderer_set_matrix.
If it is possible, I want to transform the "display" or other one , and render my layouts without transforming.
help me!

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