blob: 358923125647ec0de9ac68e31bc36ba27e823c29 [file] [log] [blame]
// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "vorg.h"
#include <vector>
// VORG - Vertical Origin Table
// http://www.microsoft.com/typography/otspec/vorg.htm
#define TABLE_NAME "VORG"
#define DROP_THIS_TABLE(...) \
do { \
OTS_FAILURE_MSG_(font->file, TABLE_NAME ": " __VA_ARGS__); \
OTS_FAILURE_MSG("Table discarded"); \
delete font->vorg; \
font->vorg = 0; \
} while (0)
namespace ots {
bool ots_vorg_parse(Font *font, const uint8_t *data, size_t length) {
Buffer table(data, length);
font->vorg = new OpenTypeVORG;
OpenTypeVORG * const vorg = font->vorg;
uint16_t num_recs;
if (!table.ReadU16(&vorg->major_version) ||
!table.ReadU16(&vorg->minor_version) ||
!table.ReadS16(&vorg->default_vert_origin_y) ||
!table.ReadU16(&num_recs)) {
return OTS_FAILURE_MSG("Failed to read header");
}
if (vorg->major_version != 1) {
DROP_THIS_TABLE("bad major version: %u", vorg->major_version);
return true;
}
if (vorg->minor_version != 0) {
DROP_THIS_TABLE("bad minor version: %u", vorg->minor_version);
return true;
}
// num_recs might be zero (e.g., DFHSMinchoPro5-W3-Demo.otf).
if (!num_recs) {
return true;
}
uint16_t last_glyph_index = 0;
vorg->metrics.reserve(num_recs);
for (unsigned i = 0; i < num_recs; ++i) {
OpenTypeVORGMetrics rec;
if (!table.ReadU16(&rec.glyph_index) ||
!table.ReadS16(&rec.vert_origin_y)) {
return OTS_FAILURE_MSG("Failed to read record %d", i);
}
if ((i != 0) && (rec.glyph_index <= last_glyph_index)) {
DROP_THIS_TABLE("the table is not sorted");
return true;
}
last_glyph_index = rec.glyph_index;
vorg->metrics.push_back(rec);
}
return true;
}
bool ots_vorg_should_serialise(Font *font) {
if (!font->cff) return false; // this table is not for fonts with TT glyphs.
return font->vorg != NULL;
}
bool ots_vorg_serialise(OTSStream *out, Font *font) {
OpenTypeVORG * const vorg = font->vorg;
const uint16_t num_metrics = static_cast<uint16_t>(vorg->metrics.size());
if (num_metrics != vorg->metrics.size() ||
!out->WriteU16(vorg->major_version) ||
!out->WriteU16(vorg->minor_version) ||
!out->WriteS16(vorg->default_vert_origin_y) ||
!out->WriteU16(num_metrics)) {
return OTS_FAILURE_MSG("Failed to write table header");
}
for (uint16_t i = 0; i < num_metrics; ++i) {
const OpenTypeVORGMetrics& rec = vorg->metrics[i];
if (!out->WriteU16(rec.glyph_index) ||
!out->WriteS16(rec.vert_origin_y)) {
return OTS_FAILURE_MSG("Failed to write record %d", i);
}
}
return true;
}
void ots_vorg_reuse(Font *font, Font *other) {
font->vorg = other->vorg;
font->vorg_reused = true;
}
void ots_vorg_free(Font *font) {
delete font->vorg;
}
} // namespace ots
#undef TABLE_NAME
#undef DROP_THIS_TABLE