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/*
Copyright (C) 2016 Alexander Borisov
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Author: lex.borisov@gmail.com (Alexander Borisov)
*/
#include "myfont/vmtx.h"
myfont_status_t myfont_load_table_vmtx(myfont_font_t *mf)
{
memset(&mf->table_vmtx, 0, sizeof(myfont_table_vmtx_t));
if(mf->cache.tables_offset[MyFONT_TKEY_vmtx] == 0)
return MyFONT_STATUS_OK;
myfont_table_vmtx_t *tvmtx = &mf->table_vmtx;
const uint32_t table_offset = mf->cache.tables_offset[MyFONT_TKEY_vmtx];
/* get current data */
uint8_t *data = &mf->file_data[table_offset];
uint16_t num_metrics = mf->table_vhea.numOfLongVerMetrics;
if(num_metrics == 0)
return MyFONT_STATUS_OK;
uint32_t pos = table_offset + (num_metrics * 4);
if(pos > mf->file_size)
return MyFONT_STATUS_ERROR_TABLE_UNEXPECTED_ENDING;
myfont_long_ver_metric_t *lver_metric = (myfont_long_ver_metric_t *)myfont_calloc(mf, num_metrics, sizeof(myfont_long_ver_metric_t));
if(lver_metric == NULL)
return MyFONT_STATUS_ERROR_MEMORY_ALLOCATION;
for(uint16_t i = 0; i < num_metrics; i++) {
lver_metric[i].advanceHeight = myfont_read_u16(&data);
lver_metric[i].topSideBearing = myfont_read_16(&data);
}
if(mf->table_maxp.numGlyphs <= mf->table_vhea.numOfLongVerMetrics) {
myfont_free(mf, lver_metric);
return MyFONT_STATUS_ERROR_TABLE_UNEXPECTED_ENDING;
}
uint16_t numOfTSB = mf->table_maxp.numGlyphs - mf->table_vhea.numOfLongVerMetrics;
pos = pos + (numOfTSB * 2);
if(pos > mf->file_size) {
myfont_free(mf, lver_metric);
return MyFONT_STATUS_ERROR_TABLE_UNEXPECTED_ENDING;
}
int16_t *topSideBearing = (int16_t *)myfont_calloc(mf, numOfTSB, sizeof(int16_t));
if(topSideBearing == NULL) {
myfont_free(mf, lver_metric);
return MyFONT_STATUS_ERROR_MEMORY_ALLOCATION;
}
for(uint16_t i = 0; i < num_metrics; i++) {
topSideBearing[i] = myfont_read_16(&data);
}
tvmtx->vMetrics = lver_metric;
tvmtx->topSideBearing = topSideBearing;
return MyFONT_STATUS_OK;
}
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