94 lines
3.0 KiB
C++
94 lines
3.0 KiB
C++
/*
|
|
* Copyright © 2018 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.
|
|
*/
|
|
#ifndef HB_AAT_LAYOUT_LCAR_TABLE_HH
|
|
#define HB_AAT_LAYOUT_LCAR_TABLE_HH
|
|
|
|
#include "hb-open-type.hh"
|
|
#include "hb-aat-layout-common.hh"
|
|
|
|
/*
|
|
* lcar -- Ligature caret
|
|
* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6lcar.html
|
|
*/
|
|
#define HB_AAT_TAG_lcar HB_TAG('l','c','a','r')
|
|
|
|
|
|
namespace AAT {
|
|
|
|
typedef ArrayOf<HBINT16> LigCaretClassEntry;
|
|
|
|
struct lcar
|
|
{
|
|
static constexpr hb_tag_t tableTag = HB_AAT_TAG_lcar;
|
|
|
|
unsigned int get_lig_carets (hb_font_t *font,
|
|
hb_direction_t direction,
|
|
hb_codepoint_t glyph,
|
|
unsigned int start_offset,
|
|
unsigned int *caret_count /* IN/OUT */,
|
|
hb_position_t *caret_array /* OUT */) const
|
|
{
|
|
const OffsetTo<LigCaretClassEntry>* entry_offset = lookup.get_value (glyph,
|
|
font->face->get_num_glyphs ());
|
|
const LigCaretClassEntry& array = entry_offset ? this+*entry_offset : Null (LigCaretClassEntry);
|
|
if (caret_count)
|
|
{
|
|
hb_array_t<const HBINT16> arr = array.sub_array (start_offset, caret_count);
|
|
unsigned int count = arr.length;
|
|
for (unsigned int i = 0; i < count; ++i)
|
|
switch (format)
|
|
{
|
|
case 0: caret_array[i] = font->em_scale_dir (arr[i], direction); break;
|
|
case 1:
|
|
hb_position_t x, y;
|
|
font->get_glyph_contour_point_for_origin (glyph, arr[i], direction, &x, &y);
|
|
caret_array[i] = HB_DIRECTION_IS_HORIZONTAL (direction) ? x : y;
|
|
break;
|
|
}
|
|
}
|
|
return array.len;
|
|
}
|
|
|
|
bool sanitize (hb_sanitize_context_t *c) const
|
|
{
|
|
TRACE_SANITIZE (this);
|
|
return_trace (likely (c->check_struct (this) &&
|
|
version.major == 1 &&
|
|
lookup.sanitize (c, this)));
|
|
}
|
|
|
|
protected:
|
|
FixedVersion<>version; /* Version number of the ligature caret table */
|
|
HBUINT16 format; /* Format of the ligature caret table. */
|
|
Lookup<OffsetTo<LigCaretClassEntry> >
|
|
lookup; /* data Lookup table associating glyphs */
|
|
|
|
public:
|
|
DEFINE_SIZE_MIN (8);
|
|
};
|
|
|
|
} /* namespace AAT */
|
|
|
|
#endif /* HB_AAT_LAYOUT_LCAR_TABLE_HH */
|