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| 1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "vorg.h" | |
| 6 | |
| 7 #include <vector> | |
| 8 | |
| 9 // VORG - Vertical Origin Table | |
| 10 // http://www.microsoft.com/typography/otspec/vorg.htm | |
| 11 | |
| 12 #define TABLE_NAME "VORG" | |
| 13 | |
| 14 #define DROP_THIS_TABLE(...) \ | |
| 15 do { \ | |
| 16 OTS_FAILURE_MSG_(file, TABLE_NAME ": " __VA_ARGS__); \ | |
| 17 OTS_FAILURE_MSG("Table discarded"); \ | |
| 18 delete file->vorg; \ | |
| 19 file->vorg = 0; \ | |
| 20 } while (0) | |
| 21 | |
| 22 namespace ots { | |
| 23 | |
| 24 bool ots_vorg_parse(OpenTypeFile *file, const uint8_t *data, size_t length) { | |
| 25 Buffer table(data, length); | |
| 26 file->vorg = new OpenTypeVORG; | |
| 27 OpenTypeVORG * const vorg = file->vorg; | |
| 28 | |
| 29 uint16_t num_recs; | |
| 30 if (!table.ReadU16(&vorg->major_version) || | |
| 31 !table.ReadU16(&vorg->minor_version) || | |
| 32 !table.ReadS16(&vorg->default_vert_origin_y) || | |
| 33 !table.ReadU16(&num_recs)) { | |
| 34 return OTS_FAILURE_MSG("Failed to read header"); | |
| 35 } | |
| 36 if (vorg->major_version != 1) { | |
| 37 DROP_THIS_TABLE("bad major version: %u", vorg->major_version); | |
| 38 return true; | |
| 39 } | |
| 40 if (vorg->minor_version != 0) { | |
| 41 DROP_THIS_TABLE("bad minor version: %u", vorg->minor_version); | |
| 42 return true; | |
| 43 } | |
| 44 | |
| 45 // num_recs might be zero (e.g., DFHSMinchoPro5-W3-Demo.otf). | |
| 46 if (!num_recs) { | |
| 47 return true; | |
| 48 } | |
| 49 | |
| 50 uint16_t last_glyph_index = 0; | |
| 51 vorg->metrics.reserve(num_recs); | |
| 52 for (unsigned i = 0; i < num_recs; ++i) { | |
| 53 OpenTypeVORGMetrics rec; | |
| 54 | |
| 55 if (!table.ReadU16(&rec.glyph_index) || | |
| 56 !table.ReadS16(&rec.vert_origin_y)) { | |
| 57 return OTS_FAILURE_MSG("Failed to read record %d", i); | |
| 58 } | |
| 59 if ((i != 0) && (rec.glyph_index <= last_glyph_index)) { | |
| 60 DROP_THIS_TABLE("the table is not sorted"); | |
| 61 return true; | |
| 62 } | |
| 63 last_glyph_index = rec.glyph_index; | |
| 64 | |
| 65 vorg->metrics.push_back(rec); | |
| 66 } | |
| 67 | |
| 68 return true; | |
| 69 } | |
| 70 | |
| 71 bool ots_vorg_should_serialise(OpenTypeFile *file) { | |
| 72 if (!file->cff) return false; // this table is not for fonts with TT glyphs. | |
| 73 return file->vorg != NULL; | |
| 74 } | |
| 75 | |
| 76 bool ots_vorg_serialise(OTSStream *out, OpenTypeFile *file) { | |
| 77 OpenTypeVORG * const vorg = file->vorg; | |
| 78 | |
| 79 const uint16_t num_metrics = static_cast<uint16_t>(vorg->metrics.size()); | |
| 80 if (num_metrics != vorg->metrics.size() || | |
| 81 !out->WriteU16(vorg->major_version) || | |
| 82 !out->WriteU16(vorg->minor_version) || | |
| 83 !out->WriteS16(vorg->default_vert_origin_y) || | |
| 84 !out->WriteU16(num_metrics)) { | |
| 85 return OTS_FAILURE_MSG("Failed to write table header"); | |
| 86 } | |
| 87 | |
| 88 for (uint16_t i = 0; i < num_metrics; ++i) { | |
| 89 const OpenTypeVORGMetrics& rec = vorg->metrics[i]; | |
| 90 if (!out->WriteU16(rec.glyph_index) || | |
| 91 !out->WriteS16(rec.vert_origin_y)) { | |
| 92 return OTS_FAILURE_MSG("Failed to write record %d", i); | |
| 93 } | |
| 94 } | |
| 95 | |
| 96 return true; | |
| 97 } | |
| 98 | |
| 99 void ots_vorg_free(OpenTypeFile *file) { | |
| 100 delete file->vorg; | |
| 101 } | |
| 102 | |
| 103 } // namespace ots | |
| 104 | |
| 105 #undef TABLE_NAME | |
| 106 #undef DROP_THIS_TABLE | |
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