232 lines
9.5 KiB
C++
232 lines
9.5 KiB
C++
/*
|
|
* Copyright © 2018-2019 Ebrahim Byagowi
|
|
*
|
|
* This is part of HarfBuzz, a text shaping library.
|
|
*
|
|
* Permission is hereby granted, without written agreement and without
|
|
* license or royalty fees, to use, copy, modify, and distribute this
|
|
* software and its documentation for any purpose, provided that the
|
|
* above copyright notice and the following two paragraphs appear in
|
|
* all copies of this software.
|
|
*
|
|
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
|
|
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
|
|
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
|
|
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
|
|
* DAMAGE.
|
|
*
|
|
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
|
|
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
|
|
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
|
|
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
|
|
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
|
|
*/
|
|
|
|
#include "hb.hh"
|
|
|
|
#include "hb-ot-var-mvar-table.hh"
|
|
#include "hb-ot-gasp-table.hh" // Just so we compile it; unused otherwise.
|
|
#include "hb-ot-os2-table.hh"
|
|
#include "hb-ot-post-table.hh"
|
|
#include "hb-ot-hhea-table.hh"
|
|
#include "hb-ot-metrics.hh"
|
|
#include "hb-ot-face.hh"
|
|
|
|
|
|
static float
|
|
_fix_ascender_descender (float value, hb_ot_metrics_tag_t metrics_tag)
|
|
{
|
|
if (metrics_tag == HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER ||
|
|
metrics_tag == HB_OT_METRICS_TAG_VERTICAL_ASCENDER)
|
|
return fabs ((double) value);
|
|
if (metrics_tag == HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER ||
|
|
metrics_tag == HB_OT_METRICS_TAG_VERTICAL_DESCENDER)
|
|
return -fabs ((double) value);
|
|
return value;
|
|
}
|
|
|
|
/* The common part of _get_position logic needed on hb-ot-font and here
|
|
to be able to have slim builds without the not always needed parts */
|
|
bool
|
|
_hb_ot_metrics_get_position_common (hb_font_t *font,
|
|
hb_ot_metrics_tag_t metrics_tag,
|
|
hb_position_t *position /* OUT. May be NULL. */)
|
|
{
|
|
hb_face_t *face = font->face;
|
|
switch ((unsigned) metrics_tag)
|
|
{
|
|
#ifndef HB_NO_VAR
|
|
#define GET_VAR face->table.MVAR->get_var (metrics_tag, font->coords, font->num_coords)
|
|
#else
|
|
#define GET_VAR .0f
|
|
#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))
|
|
#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))
|
|
case HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER:
|
|
return (face->table.OS2->use_typo_metrics () && GET_METRIC_Y (OS2, sTypoAscender)) ||
|
|
GET_METRIC_Y (hhea, ascender);
|
|
case HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER:
|
|
return (face->table.OS2->use_typo_metrics () && GET_METRIC_Y (OS2, sTypoDescender)) ||
|
|
GET_METRIC_Y (hhea, descender);
|
|
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);
|
|
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);
|
|
#undef GET_METRIC_Y
|
|
#undef GET_METRIC_X
|
|
#undef GET_VAR
|
|
default: assert (0); return false;
|
|
}
|
|
}
|
|
|
|
#ifndef HB_NO_METRICS
|
|
|
|
#if 0
|
|
static bool
|
|
_get_gasp (hb_face_t *face, float *result, hb_ot_metrics_tag_t metrics_tag)
|
|
{
|
|
const OT::GaspRange& range = face->table.gasp->get_gasp_range (metrics_tag - HB_TAG ('g','s','p','0'));
|
|
if (&range == &Null (OT::GaspRange)) return false;
|
|
if (result) *result = range.rangeMaxPPEM + font->face->table.MVAR->get_var (metrics_tag, font->coords, font->num_coords);
|
|
return true;
|
|
}
|
|
#endif
|
|
|
|
/* Private tags for https://github.com/harfbuzz/harfbuzz/issues/1866 */
|
|
#define _HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER_OS2 HB_TAG ('O','a','s','c')
|
|
#define _HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER_HHEA HB_TAG ('H','a','s','c')
|
|
#define _HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER_OS2 HB_TAG ('O','d','s','c')
|
|
#define _HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER_HHEA HB_TAG ('H','d','s','c')
|
|
#define _HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP_OS2 HB_TAG ('O','l','g','p')
|
|
#define _HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP_HHEA HB_TAG ('H','l','g','p')
|
|
|
|
/**
|
|
* hb_ot_metrics_get_position:
|
|
* @font: a #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.
|
|
*
|
|
* Returns: Whether found the requested metrics in the font.
|
|
* Since: 2.6.0
|
|
**/
|
|
hb_bool_t
|
|
hb_ot_metrics_get_position (hb_font_t *font,
|
|
hb_ot_metrics_tag_t metrics_tag,
|
|
hb_position_t *position /* OUT. May be NULL. */)
|
|
{
|
|
hb_face_t *face = font->face;
|
|
switch ((unsigned) metrics_tag)
|
|
{
|
|
case HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER:
|
|
case HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER:
|
|
case HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP:
|
|
case HB_OT_METRICS_TAG_VERTICAL_ASCENDER:
|
|
case HB_OT_METRICS_TAG_VERTICAL_DESCENDER:
|
|
case HB_OT_METRICS_TAG_VERTICAL_LINE_GAP: return _hb_ot_metrics_get_position_common (font, metrics_tag, position);
|
|
#ifndef HB_NO_VAR
|
|
#define GET_VAR hb_ot_metrics_get_variation (font, metrics_tag)
|
|
#else
|
|
#define GET_VAR 0
|
|
#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))
|
|
#define GET_METRIC_Y(TABLE, ATTR) \
|
|
(face->table.TABLE->has_data () && \
|
|
(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_OFFSET: return GET_METRIC_X (hhea, caretOffset);
|
|
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);
|
|
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);
|
|
case HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_SIZE: return GET_METRIC_Y (OS2, ySubscriptYSize);
|
|
case HB_OT_METRICS_TAG_SUBSCRIPT_EM_X_OFFSET: return GET_METRIC_X (OS2, ySubscriptXOffset);
|
|
case HB_OT_METRICS_TAG_SUBSCRIPT_EM_Y_OFFSET: return GET_METRIC_Y (OS2, ySubscriptYOffset);
|
|
case HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_SIZE: return GET_METRIC_X (OS2, ySuperscriptXSize);
|
|
case HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_SIZE: return GET_METRIC_Y (OS2, ySuperscriptYSize);
|
|
case HB_OT_METRICS_TAG_SUPERSCRIPT_EM_X_OFFSET: return GET_METRIC_X (OS2, ySuperscriptXOffset);
|
|
case HB_OT_METRICS_TAG_SUPERSCRIPT_EM_Y_OFFSET: return GET_METRIC_Y (OS2, ySuperscriptYOffset);
|
|
case HB_OT_METRICS_TAG_STRIKEOUT_SIZE: return GET_METRIC_Y (OS2, yStrikeoutSize);
|
|
case HB_OT_METRICS_TAG_STRIKEOUT_OFFSET: return GET_METRIC_Y (OS2, yStrikeoutPosition);
|
|
case HB_OT_METRICS_TAG_UNDERLINE_SIZE: return GET_METRIC_Y (post->table, underlineThickness);
|
|
case HB_OT_METRICS_TAG_UNDERLINE_OFFSET: return GET_METRIC_Y (post->table, underlinePosition);
|
|
|
|
/* Private tags */
|
|
case _HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER_OS2: return GET_METRIC_Y (OS2, sTypoAscender);
|
|
case _HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER_HHEA: return GET_METRIC_Y (hhea, ascender);
|
|
case _HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER_OS2: return GET_METRIC_Y (OS2, sTypoDescender);
|
|
case _HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER_HHEA: return GET_METRIC_Y (hhea, descender);
|
|
case _HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP_OS2: return GET_METRIC_Y (OS2, sTypoLineGap);
|
|
case _HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP_HHEA: return GET_METRIC_Y (hhea, lineGap);
|
|
#undef GET_METRIC_Y
|
|
#undef GET_METRIC_X
|
|
#undef GET_VAR
|
|
default: return false;
|
|
}
|
|
}
|
|
|
|
#ifndef HB_NO_VAR
|
|
/**
|
|
* hb_ot_metrics_get_variation:
|
|
* @font:
|
|
* @metrics_tag:
|
|
*
|
|
* Returns:
|
|
*
|
|
* Since: 2.6.0
|
|
**/
|
|
float
|
|
hb_ot_metrics_get_variation (hb_font_t *font, hb_ot_metrics_tag_t metrics_tag)
|
|
{
|
|
return font->face->table.MVAR->get_var (metrics_tag, font->coords, font->num_coords);
|
|
}
|
|
|
|
/**
|
|
* hb_ot_metrics_get_x_variation:
|
|
* @font:
|
|
* @metrics_tag:
|
|
*
|
|
* Returns:
|
|
*
|
|
* Since: 2.6.0
|
|
**/
|
|
hb_position_t
|
|
hb_ot_metrics_get_x_variation (hb_font_t *font, hb_ot_metrics_tag_t metrics_tag)
|
|
{
|
|
return font->em_scalef_x (hb_ot_metrics_get_variation (font, metrics_tag));
|
|
}
|
|
|
|
/**
|
|
* hb_ot_metrics_get_y_variation:
|
|
* @font:
|
|
* @metrics_tag:
|
|
*
|
|
* Returns:
|
|
*
|
|
* Since: 2.6.0
|
|
**/
|
|
hb_position_t
|
|
hb_ot_metrics_get_y_variation (hb_font_t *font, hb_ot_metrics_tag_t metrics_tag)
|
|
{
|
|
return font->em_scalef_y (hb_ot_metrics_get_variation (font, metrics_tag));
|
|
}
|
|
#endif
|
|
|
|
#endif
|