1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/ots/src/vorg.cc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,103 @@
1.4 +// Copyright (c) 2009 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#include "vorg.h"
1.9 +
1.10 +#include <vector>
1.11 +
1.12 +// VORG - Vertical Origin Table
1.13 +// http://www.microsoft.com/typography/otspec/vorg.htm
1.14 +
1.15 +#define TABLE_NAME "VORG"
1.16 +
1.17 +#define DROP_THIS_TABLE \
1.18 + do { \
1.19 + delete file->vorg; \
1.20 + file->vorg = 0; \
1.21 + OTS_FAILURE_MSG("Table discarded"); \
1.22 + } while (0)
1.23 +
1.24 +namespace ots {
1.25 +
1.26 +bool ots_vorg_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
1.27 + Buffer table(data, length);
1.28 + file->vorg = new OpenTypeVORG;
1.29 + OpenTypeVORG * const vorg = file->vorg;
1.30 +
1.31 + uint16_t num_recs;
1.32 + if (!table.ReadU16(&vorg->major_version) ||
1.33 + !table.ReadU16(&vorg->minor_version) ||
1.34 + !table.ReadS16(&vorg->default_vert_origin_y) ||
1.35 + !table.ReadU16(&num_recs)) {
1.36 + return OTS_FAILURE_MSG("Failed to read header");
1.37 + }
1.38 + if (vorg->major_version != 1) {
1.39 + OTS_WARNING("bad major version: %u", vorg->major_version);
1.40 + DROP_THIS_TABLE;
1.41 + return true;
1.42 + }
1.43 + if (vorg->minor_version != 0) {
1.44 + OTS_WARNING("bad minor version: %u", vorg->minor_version);
1.45 + DROP_THIS_TABLE;
1.46 + return true;
1.47 + }
1.48 +
1.49 + // num_recs might be zero (e.g., DFHSMinchoPro5-W3-Demo.otf).
1.50 + if (!num_recs) {
1.51 + return true;
1.52 + }
1.53 +
1.54 + uint16_t last_glyph_index = 0;
1.55 + vorg->metrics.reserve(num_recs);
1.56 + for (unsigned i = 0; i < num_recs; ++i) {
1.57 + OpenTypeVORGMetrics rec;
1.58 +
1.59 + if (!table.ReadU16(&rec.glyph_index) ||
1.60 + !table.ReadS16(&rec.vert_origin_y)) {
1.61 + return OTS_FAILURE_MSG("Failed to read record %d", i);
1.62 + }
1.63 + if ((i != 0) && (rec.glyph_index <= last_glyph_index)) {
1.64 + OTS_WARNING("the table is not sorted");
1.65 + DROP_THIS_TABLE;
1.66 + return true;
1.67 + }
1.68 + last_glyph_index = rec.glyph_index;
1.69 +
1.70 + vorg->metrics.push_back(rec);
1.71 + }
1.72 +
1.73 + return true;
1.74 +}
1.75 +
1.76 +bool ots_vorg_should_serialise(OpenTypeFile *file) {
1.77 + if (!file->cff) return false; // this table is not for fonts with TT glyphs.
1.78 + return file->vorg != NULL;
1.79 +}
1.80 +
1.81 +bool ots_vorg_serialise(OTSStream *out, OpenTypeFile *file) {
1.82 + OpenTypeVORG * const vorg = file->vorg;
1.83 +
1.84 + if (!out->WriteU16(vorg->major_version) ||
1.85 + !out->WriteU16(vorg->minor_version) ||
1.86 + !out->WriteS16(vorg->default_vert_origin_y) ||
1.87 + !out->WriteU16(vorg->metrics.size())) {
1.88 + return OTS_FAILURE_MSG("Failed to write table header");
1.89 + }
1.90 +
1.91 + for (unsigned i = 0; i < vorg->metrics.size(); ++i) {
1.92 + const OpenTypeVORGMetrics& rec = vorg->metrics[i];
1.93 + if (!out->WriteU16(rec.glyph_index) ||
1.94 + !out->WriteS16(rec.vert_origin_y)) {
1.95 + return OTS_FAILURE_MSG("Failed to write record %d", i);
1.96 + }
1.97 + }
1.98 +
1.99 + return true;
1.100 +}
1.101 +
1.102 +void ots_vorg_free(OpenTypeFile *file) {
1.103 + delete file->vorg;
1.104 +}
1.105 +
1.106 +} // namespace ots
