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[user-font] Implement subpixel-positioning

Behdad Esfahbod requested to merge behdad1/cairo:user-font-subpixel-position into master

See:

https://github.com/harfbuzz/harfbuzz/pull/3411#issuecomment-1033118545 https://github.com/harfbuzz/harfbuzz/pull/3411#issuecomment-1033125311 https://github.com/harfbuzz/harfbuzz/pull/3411#issuecomment-1037765840

Basically the code in cairo-image-compositor.c:composite_glyphs() is flooring glyph positions and putting some phase in the glyph-id. This was being lost in the user-font backend. Fetch that and put it in the recording-surface's device-transform translation, to be applied.

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