If removing the call or replacing it with

pango_context_set_round_glyph_positions(pcontext, TRUE);

doesn't change the appearance then this is a different issue. Your system may have different defaults.

Here's an image from my system with both choices.

The width of 'I' in DejaVu Sans Mono,size:12 changes from 9.632812 pixels to 10.0 pixels with FALSE/TRUE values for pango_context_set_round_glyph_positions on Ubuntu 23.10.

I expect the same characters to be displayed the same way.

Drawing is performed using a floating-point coordinate space over an visual with distinct (integral) pixels. Drawing 'I' at (0,0) will colour pixels differently then drawing 'I' at (9.632812, 0).

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