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common/pango: Disable glyph position rounding

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Pango rounds glyph position and widths to nearest integer, which leads
to font dimensions jumping around when rendering with a scale, causing
text geometry to jump around when changing scale. This is disturbing
when text buffers change scale, and also mean that the text geometry
calculations in sway_text_node are incorrect.

Disable this rounding to make the geometry stable.
This commit is contained in:
Kenny Levinsen 2024-07-11 00:33:19 +02:00 committed by Alexander Orzechowski
parent 28fd73589d
commit 8c5b23e592
1 changed files with 3 additions and 0 deletions
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3
common/pango.c
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@ -53,6 +53,8 @@ size_t escape_markup_text(const char *src, char *dest) {
PangoLayout *get_pango_layout(cairo_t *cairo, const PangoFontDescription *desc,
const char *text, double scale, bool markup) {
PangoLayout *layout = pango_cairo_create_layout(cairo);
pango_context_set_round_glyph_positions(pango_layout_get_context(layout), false);
PangoAttrList *attrs;
if (markup) {
char *buf;
@ -104,6 +106,7 @@ void get_text_size(cairo_t *cairo, const PangoFontDescription *desc, int *width,
void get_text_metrics(const PangoFontDescription *description, int *height, int *baseline) {
cairo_t *cairo = cairo_create(NULL);
PangoContext *pango = pango_cairo_create_context(cairo);
pango_context_set_round_glyph_positions(pango, false);
// When passing NULL as a language, pango uses the current locale.
PangoFontMetrics *metrics = pango_context_get_metrics(pango, description, NULL);