Add hb_font_[sg]et_ptem() to set/get point size on font
New API:
hb_font_set_ptem()
hb_font_get_ptem()
Needed for hb-coretext optical sizing:
https://github.com/behdad/harfbuzz/issues/360
diff --git a/src/hb-font.h b/src/hb-font.h
index 85fb56d..8fb1849 100644
--- a/src/hb-font.h
+++ b/src/hb-font.h
@@ -607,6 +607,16 @@
unsigned int *x_ppem,
unsigned int *y_ppem);
+/*
+ * Point size per EM. Used for optical-sizing in CoreText.
+ * A -1 means "not set".
+ */
+HB_EXTERN void
+hb_font_set_ptem (hb_font_t *font, float ptem);
+
+HB_EXTERN float
+hb_font_get_ptem (hb_font_t *font);
+
HB_EXTERN void
hb_font_set_variations (hb_font_t *font,
const hb_variation_t *variations,
