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