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FT_Set_Var_Design_Coordinates() does not affect previously rendered glyphs

Submitted by Khaled Hosny

Assigned to Behdad Esfahbod

Link to original bug (#102645)

Description

Created attachment 134130 Test program

I’m trying to render variable fonts with Cairo and FreeType. If I call FT_Set_Var_Design_Coordinates() before rendering any glyphs things work as expected, but if a glyph is rendered with certain variable coordinates it will not be affected by FT_Set_Var_Design_Coordinates() and will be always rendered with the old coordinates.

Looks like the glyph cash does not take variable coordinates into account. The attached test program shows the issue; the second A should be rendered using the light not the heavy weight.

Attachment 134130, "Test program":
test.c

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