harfbuzz/src/hb-ot-vorg-table.hh

190 lines
5.4 KiB
C++

/*
* Copyright © 2018 Adobe Inc.
*
* 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.
*
* Adobe Author(s): Michiharu Ariza
*/
#ifndef HB_OT_VORG_TABLE_HH
#define HB_OT_VORG_TABLE_HH
#include "hb-open-type.hh"
/*
* VORG -- Vertical Origin Table
* https://docs.microsoft.com/en-us/typography/opentype/spec/vorg
*/
#define HB_OT_TAG_VORG HB_TAG('V','O','R','G')
namespace OT {
struct VertOriginMetric
{
int cmp (hb_codepoint_t g) const { return glyph.cmp (g); }
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
public:
GlyphID glyph;
FWORD vertOriginY;
public:
DEFINE_SIZE_STATIC (4);
};
struct VORG
{
static constexpr hb_tag_t tableTag = HB_OT_TAG_VORG;
bool has_data () const { return version.to_int (); }
int get_y_origin (hb_codepoint_t glyph) const
{
unsigned int i;
if (!vertYOrigins.bfind (glyph, &i))
return defaultVertOriginY;
return vertYOrigins[i].vertOriginY;
}
bool _subset (const hb_subset_plan_t *plan HB_UNUSED,
const VORG *vorg_table,
const hb_vector_t<VertOriginMetric> &subset_metrics,
unsigned int dest_sz,
void *dest) const
{
hb_serialize_context_t c (dest, dest_sz);
VORG *subset_table = c.start_serialize<VORG> ();
if (unlikely (!c.extend_min (*subset_table)))
return false;
subset_table->version.major.set (1);
subset_table->version.minor.set (0);
subset_table->defaultVertOriginY.set (vorg_table->defaultVertOriginY);
subset_table->vertYOrigins.len.set (subset_metrics.length);
bool success = true;
if (subset_metrics.length > 0)
{
unsigned int size = VertOriginMetric::static_size * subset_metrics.length;
VertOriginMetric *metrics = c.allocate_size<VertOriginMetric> (size);
if (likely (metrics != nullptr))
memcpy (metrics, &subset_metrics[0], size);
else
success = false;
}
c.end_serialize ();
return success;
}
bool subset (hb_subset_plan_t *plan) const
{
hb_blob_t *vorg_blob = hb_sanitize_context_t().reference_table<VORG> (plan->source);
const VORG *vorg_table = vorg_blob->as<VORG> ();
/* count the number of glyphs to be included in the subset table */
hb_vector_t<VertOriginMetric> subset_metrics;
subset_metrics.init ();
hb_codepoint_t old_glyph = HB_SET_VALUE_INVALID;
unsigned int i = 0;
while (i < vertYOrigins.len
&& plan->glyphset ()->next (&old_glyph))
{
while (old_glyph > vertYOrigins[i].glyph)
{
i++;
if (i >= vertYOrigins.len)
break;
}
if (old_glyph == vertYOrigins[i].glyph)
{
hb_codepoint_t new_glyph;
if (plan->new_gid_for_old_gid (old_glyph, &new_glyph))
{
VertOriginMetric *metrics = subset_metrics.push ();
metrics->glyph.set (new_glyph);
metrics->vertOriginY.set (vertYOrigins[i].vertOriginY);
}
}
}
/* alloc the new table */
unsigned int dest_sz = VORG::min_size + VertOriginMetric::static_size * subset_metrics.length;
void *dest = (void *) malloc (dest_sz);
if (unlikely (!dest))
{
subset_metrics.fini ();
hb_blob_destroy (vorg_blob);
return false;
}
/* serialize the new table */
if (!_subset (plan, vorg_table, subset_metrics, dest_sz, dest))
{
subset_metrics.fini ();
free (dest);
hb_blob_destroy (vorg_blob);
return false;
}
hb_blob_t *result = hb_blob_create ((const char *)dest,
dest_sz,
HB_MEMORY_MODE_READONLY,
dest,
free);
bool success = plan->add_table (HB_OT_TAG_VORG, result);
hb_blob_destroy (result);
subset_metrics.fini ();
hb_blob_destroy (vorg_blob);
return success;
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
version.major == 1 &&
vertYOrigins.sanitize (c));
}
protected:
FixedVersion<> version; /* Version of VORG table. Set to 0x00010000u. */
FWORD defaultVertOriginY; /* The default vertical origin. */
SortedArrayOf<VertOriginMetric>
vertYOrigins; /* The array of vertical origins. */
public:
DEFINE_SIZE_ARRAY(8, vertYOrigins);
};
} /* namespace OT */
#endif /* HB_OT_VORG_TABLE_HH */