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-rw-r--r--src/3rdparty/harfbuzz-ng/src/hb-ot-metrics.cc243
1 files changed, 224 insertions, 19 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-ot-metrics.cc b/src/3rdparty/harfbuzz-ng/src/hb-ot-metrics.cc
index 181ac4d57e..e314d946b6 100644
--- a/src/3rdparty/harfbuzz-ng/src/hb-ot-metrics.cc
+++ b/src/3rdparty/harfbuzz-ng/src/hb-ot-metrics.cc
@@ -33,6 +33,15 @@
#include "hb-ot-face.hh"
+/**
+ * SECTION:hb-ot-metrics
+ * @title: hb-ot-metrics
+ * @short_description: OpenType Metrics
+ * @include: hb-ot.h
+ *
+ * Functions for fetching metrics from fonts.
+ **/
+
static float
_fix_ascender_descender (float value, hb_ot_metrics_tag_t metrics_tag)
{
@@ -62,12 +71,13 @@ _hb_ot_metrics_get_position_common (hb_font_t *font,
#endif
#define GET_METRIC_X(TABLE, ATTR) \
(face->table.TABLE->has_data () && \
- (position && (*position = font->em_scalef_x (_fix_ascender_descender ( \
- face->table.TABLE->ATTR + GET_VAR, metrics_tag))), true))
+ ((void) (position && (*position = font->em_scalef_x (_fix_ascender_descender ( \
+ face->table.TABLE->ATTR + GET_VAR, metrics_tag)))), true))
#define GET_METRIC_Y(TABLE, ATTR) \
(face->table.TABLE->has_data () && \
- (position && (*position = font->em_scalef_y (_fix_ascender_descender ( \
- face->table.TABLE->ATTR + GET_VAR, metrics_tag))), true))
+ ((void) (position && (*position = font->em_scalef_y (_fix_ascender_descender ( \
+ face->table.TABLE->ATTR + GET_VAR, metrics_tag)))), true))
+
case HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER:
return (face->table.OS2->use_typo_metrics () && GET_METRIC_Y (OS2, sTypoAscender)) ||
GET_METRIC_Y (hhea, ascender);
@@ -77,9 +87,13 @@ _hb_ot_metrics_get_position_common (hb_font_t *font,
case HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP:
return (face->table.OS2->use_typo_metrics () && GET_METRIC_Y (OS2, sTypoLineGap)) ||
GET_METRIC_Y (hhea, lineGap);
+
+#ifndef HB_NO_VERTICAL
case HB_OT_METRICS_TAG_VERTICAL_ASCENDER: return GET_METRIC_X (vhea, ascender);
case HB_OT_METRICS_TAG_VERTICAL_DESCENDER: return GET_METRIC_X (vhea, descender);
case HB_OT_METRICS_TAG_VERTICAL_LINE_GAP: return GET_METRIC_X (vhea, lineGap);
+#endif
+
#undef GET_METRIC_Y
#undef GET_METRIC_X
#undef GET_VAR
@@ -110,11 +124,11 @@ _get_gasp (hb_face_t *face, float *result, hb_ot_metrics_tag_t metrics_tag)
/**
* hb_ot_metrics_get_position:
- * @font: a #hb_font_t object.
+ * @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.
*
- * It fetches metrics value corresponding to a given tag from a font.
+ * Fetches metrics value corresponding to @metrics_tag from @font.
*
* Returns: Whether found the requested metrics in the font.
* Since: 2.6.0
@@ -140,18 +154,61 @@ hb_ot_metrics_get_position (hb_font_t *font,
#endif
#define GET_METRIC_X(TABLE, ATTR) \
(face->table.TABLE->has_data () && \
- (position && (*position = font->em_scalef_x (face->table.TABLE->ATTR + GET_VAR)), true))
+ ((void) (position && (*position = font->em_scalef_x (face->table.TABLE->ATTR + GET_VAR))), true))
#define GET_METRIC_Y(TABLE, ATTR) \
(face->table.TABLE->has_data () && \
- (position && (*position = font->em_scalef_y (face->table.TABLE->ATTR + GET_VAR)), true))
+ ((void) (position && (*position = font->em_scalef_y (face->table.TABLE->ATTR + GET_VAR))), true))
case HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_ASCENT: return GET_METRIC_Y (OS2, usWinAscent);
case HB_OT_METRICS_TAG_HORIZONTAL_CLIPPING_DESCENT: return GET_METRIC_Y (OS2, usWinDescent);
- case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE: return GET_METRIC_Y (hhea, caretSlopeRise);
- case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RUN: return GET_METRIC_X (hhea, caretSlopeRun);
+
+ case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE:
+ case HB_OT_METRICS_TAG_HORIZONTAL_CARET_RUN:
+ {
+ unsigned mult = 1u;
+
+ if (font->slant)
+ {
+ unsigned rise = face->table.hhea->caretSlopeRise;
+ unsigned upem = face->get_upem ();
+ mult = (rise && rise < upem) ? hb_min (upem / rise, 256u) : 1u;
+ }
+
+ if (metrics_tag == HB_OT_METRICS_TAG_HORIZONTAL_CARET_RISE)
+ {
+ bool ret = GET_METRIC_Y (hhea, caretSlopeRise);
+
+ if (position)
+ *position *= mult;
+
+ return ret;
+ }
+ else
+ {
+ hb_position_t rise = 0;
+
+ if (font->slant && position && GET_METRIC_Y (hhea, caretSlopeRise))
+ rise = *position;
+
+ bool ret = GET_METRIC_X (hhea, caretSlopeRun);
+
+ if (position)
+ {
+ *position *= mult;
+
+ if (font->slant)
+ *position += roundf (mult * font->slant_xy * rise);
+ }
+
+ return ret;
+ }
+ }
case HB_OT_METRICS_TAG_HORIZONTAL_CARET_OFFSET: return GET_METRIC_X (hhea, caretOffset);
+
+#ifndef HB_NO_VERTICAL
case HB_OT_METRICS_TAG_VERTICAL_CARET_RISE: return GET_METRIC_X (vhea, caretSlopeRise);
case HB_OT_METRICS_TAG_VERTICAL_CARET_RUN: return GET_METRIC_Y (vhea, caretSlopeRun);
case HB_OT_METRICS_TAG_VERTICAL_CARET_OFFSET: return GET_METRIC_Y (vhea, caretOffset);
+#endif
case HB_OT_METRICS_TAG_X_HEIGHT: return GET_METRIC_Y (OS2->v2 (), sxHeight);
case HB_OT_METRICS_TAG_CAP_HEIGHT: return GET_METRIC_Y (OS2->v2 (), sCapHeight);
case HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_SIZE: return GET_METRIC_X (OS2, ySubscriptXSize);
@@ -181,13 +238,155 @@ 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:
- * @font:
- * @metrics_tag:
+ * @font: an #hb_font_t object.
+ * @metrics_tag: tag of metrics value you like to fetch.
+ *
+ * Fetches metrics value corresponding to @metrics_tag from @font with the
+ * current font variation settings applied.
*
- * Returns:
+ * Returns: The requested metric value.
*
* Since: 2.6.0
**/
@@ -199,10 +398,13 @@ hb_ot_metrics_get_variation (hb_font_t *font, hb_ot_metrics_tag_t metrics_tag)
/**
* hb_ot_metrics_get_x_variation:
- * @font:
- * @metrics_tag:
+ * @font: an #hb_font_t object.
+ * @metrics_tag: tag of metrics value you like to fetch.
+ *
+ * Fetches horizontal metrics value corresponding to @metrics_tag from @font
+ * with the current font variation settings applied.
*
- * Returns:
+ * Returns: The requested metric value.
*
* Since: 2.6.0
**/
@@ -214,10 +416,13 @@ hb_ot_metrics_get_x_variation (hb_font_t *font, hb_ot_metrics_tag_t metrics_tag)
/**
* hb_ot_metrics_get_y_variation:
- * @font:
- * @metrics_tag:
+ * @font: an #hb_font_t object.
+ * @metrics_tag: tag of metrics value you like to fetch.
+ *
+ * Fetches vertical metrics value corresponding to @metrics_tag from @font with
+ * the current font variation settings applied.
*
- * Returns:
+ * Returns: The requested metric value.
*
* Since: 2.6.0
**/
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-23 14:44:45 +0000