Render small-caps font variant #1611
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- pango has a PANGO_VARIANT_SMALL_CAPS variant that can be added to the font description, but setting it doesn't cause text to be rendered in small-caps, even if the font supports it - adding the appropriate opentype features to the layout's attributes list will use the font's small-caps glyphs if it provides them
samizdatco
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Thanks for this. Looks good in general. pango_attr_font_features_new is not available in the (old) version of Pango for Windows that we link to in the wiki and use in CI, so we might have to #ifdef PANGO_VERSION(... the new code.
We should also probably change CI testing to use MSYS like the prebuilds do.
- the font-variant state will get out of sync with the fontDescription across context-saves & restores unless we keep a copy of the PangoAttrList around
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I realized that my initial version didn't account for state and would get out of sync with the displayed font after a save() and a restore(). So I've added a field to the state struct called |
- the pango NEWS file suggests 1.37.1 was where the `pango_attr_font_features_new` call was added...
- it can be enabled if/when the pango version is updated
| @@ -258,6 +262,8 @@ Context2d::save() { | |||
| states[++stateno] = (canvas_state_t *) malloc(sizeof(canvas_state_t)); | |||
| memcpy(states[stateno], state, sizeof(canvas_state_t)); | |||
| states[stateno]->fontDescription = pango_font_description_copy(states[stateno-1]->fontDescription); | |||
| states[stateno]->textAttributes = pango_attr_list_copy(states[stateno-1]->textAttributes); | |||
| pango_layout_set_attributes(_layout, states[stateno]->textAttributes); | |||
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This doesn't quite rhyme with how we handle the font description on the state (continued below)
| } else { | ||
| features = pango_attr_font_features_new(""); | ||
| } | ||
| pango_attr_list_change(context->state->textAttributes, features); |
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It's a little more code, but you could instead free the attr list on the stack first, then set the a fresh attr list on the layout and stack here. That way it's a little more like the code above and we're not mutating objects on the state.
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It looks like no progress on this in awhile. Is it a complicated fix to add small-caps support in? |
zbjornson
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Thanks for contributing!