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