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-rw-r--r--Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-metrics.cc139
1 files changed, 139 insertions, 0 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-metrics.cc b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-metrics.cc
index 103808cf918..f9c4b96fff6 100644
--- a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-metrics.cc
+++ b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-metrics.cc
@@ -238,6 +238,145 @@ hb_ot_metrics_get_position (hb_font_t *font,
}
}
+/**
+ * hb_ot_metrics_get_position_with_fallback:
+ * @font: an #hb_font_t object.
+ * @metrics_tag: tag of metrics value you like to fetch.
+ * @position: (out) (optional): result of metrics value from the font.
+ *
+ * Fetches metrics value corresponding to @metrics_tag from @font,
+ * and synthesizes a value if it the value is missing in the font.
+ *
+ * Since: 4.0.0
+ **/
+void
+hb_ot_metrics_get_position_with_fallback (hb_font_t *font,
+ hb_ot_metrics_tag_t metrics_tag,
+ hb_position_t *position /* OUT */)
+{
+ hb_font_extents_t font_extents;
+ hb_codepoint_t glyph;
+ hb_glyph_extents_t extents;
+
+ if (hb_ot_metrics_get_position (font, metrics_tag, position))
+ {
+ if ((metrics_tag != HB_OT_METRICS_TAG_STRIKEOUT_SIZE &&
+ metrics_tag != HB_OT_METRICS_TAG_UNDERLINE_SIZE) ||
+ *position != 0)
+ return;
+ }
+
+ switch (metrics_tag)
+ {
+ case HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER:
+ case HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_ASCENT:
+ hb_font_get_extents_for_direction (font, HB_DIRECTION_LTR, &font_extents);
+ *position = font_extents.ascender;
+ break;
+
+ case HB_OT_METRICS_TAG_VERTICAL_ASCENDER:
+ hb_font_get_extents_for_direction (font, HB_DIRECTION_TTB, &font_extents);
+ *position = font_extents.ascender;
+ break;
+
+ case HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER:
+ case HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_DESCENT:
+ hb_font_get_extents_for_direction (font, HB_DIRECTION_LTR, &font_extents);
+ *position = font_extents.descender;
+ break;
+
+ case HB_OT_METRICS_TAG_VERTICAL_DESCENDER:
+ hb_font_get_extents_for_direction (font, HB_DIRECTION_TTB, &font_extents);
+ *position = font_extents.ascender;
+ break;
+
+ case HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP:
+ hb_font_get_extents_for_direction (font, HB_DIRECTION_LTR, &font_extents);
+ *position = font_extents.line_gap;
+ break;
+
+ case HB_OT_METRICS_TAG_VERTICAL_LINE_GAP:
+ hb_font_get_extents_for_direction (font, HB_DIRECTION_TTB, &font_extents);
+ *position = font_extents.line_gap;
+ break;
+
+ case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE:
+ case HB_OT_METRICS_TAG_VERTICAL_CARET_RISE:
+ *position = 1;
+ break;
+
+ case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RUN:
+ case HB_OT_METRICS_TAG_VERTICAL_CARET_RUN:
+ *position = 0;
+ break;
+
+ case HB_OT_METRICS_TAG_HORIZONTAL_CARET_OFFSET:
+ case HB_OT_METRICS_TAG_VERTICAL_CARET_OFFSET:
+ *position = 0;
+ break;
+
+ case HB_OT_METRICS_TAG_X_HEIGHT:
+ if (hb_font_get_nominal_glyph (font, 'x', &glyph) &&
+ hb_font_get_glyph_extents (font, glyph, &extents))
+ *position = extents.y_bearing;
+ else
+ *position = font->y_scale / 2;
+ break;
+
+ case HB_OT_METRICS_TAG_CAP_HEIGHT:
+ if (hb_font_get_nominal_glyph (font, 'O', &glyph) &&
+ hb_font_get_glyph_extents (font, glyph, &extents))
+ *position = extents.height + 2 * extents.y_bearing;
+ else
+ *position = font->y_scale * 2 / 3;
+ break;
+
+ case HB_OT_METRICS_TAG_STRIKEOUT_SIZE:
+ case HB_OT_METRICS_TAG_UNDERLINE_SIZE:
+ *position = font->y_scale / 18;
+ break;
+
+ case HB_OT_METRICS_TAG_STRIKEOUT_OFFSET:
+ {
+ hb_position_t ascender;
+ hb_ot_metrics_get_position_with_fallback (font,
+ HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER,
+ &ascender);
+ *position = ascender / 2;
+ }
+ break;
+
+ case HB_OT_METRICS_TAG_UNDERLINE_OFFSET:
+ *position = - font->y_scale / 18;
+ break;
+
+ case HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_SIZE:
+ case HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_SIZE:
+ *position = font->x_scale * 10 / 12;
+ break;
+
+ case HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_SIZE:
+ case HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_SIZE:
+ *position = font->y_scale * 10 / 12;
+ break;
+
+ case HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_OFFSET:
+ case HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_OFFSET:
+ *position = 0;
+ break;
+
+ case HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_OFFSET:
+ case HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_OFFSET:
+ *position = font->y_scale / 5;
+ break;
+
+ case _HB_OT_METRICS_TAG_MAX_VALUE:
+ default:
+ *position = 0;
+ break;
+ }
+}
+
#ifndef HB_NO_VAR
/**
* hb_ot_metrics_get_variation: