The Tor Browser / file comparison
comparison: gfx/ots/src/hdmx.cc
gfx/ots/src/hdmx.cc
- changeset 0
- 6474c204b198
equal
deleted
inserted
replaced
| -1:000000000000 | 0:1190aacef3ca |
|---|---|
| 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 "hdmx.h" | |
| 6 #include "head.h" | |
| 7 #include "maxp.h" | |
| 8 | |
| 9 // hdmx - Horizontal Device Metrics | |
| 10 // http://www.microsoft.com/typography/otspec/hdmx.htm | |
| 11 | |
| 12 #define TABLE_NAME "hdmx" | |
| 13 | |
| 14 #define DROP_THIS_TABLE \ | |
| 15 do { \ | |
| 16 delete file->hdmx; \ | |
| 17 file->hdmx = 0; \ | |
| 18 OTS_FAILURE_MSG("Table discarded"); \ | |
| 19 } while (0) | |
| 20 | |
| 21 namespace ots { | |
| 22 | |
| 23 bool ots_hdmx_parse(OpenTypeFile *file, const uint8_t *data, size_t length) { | |
| 24 Buffer table(data, length); | |
| 25 file->hdmx = new OpenTypeHDMX; | |
| 26 OpenTypeHDMX * const hdmx = file->hdmx; | |
| 27 | |
| 28 if (!file->head || !file->maxp) { | |
| 29 return OTS_FAILURE_MSG("Missing maxp or head tables in font, needed by hdmx"); | |
| 30 } | |
| 31 | |
| 32 if ((file->head->flags & 0x14) == 0) { | |
| 33 // http://www.microsoft.com/typography/otspec/recom.htm | |
| 34 OTS_WARNING("the table should not be present when bit 2 and 4 of the " | |
| 35 "head->flags are not set"); | |
| 36 DROP_THIS_TABLE; | |
| 37 return true; | |
| 38 } | |
| 39 | |
| 40 int16_t num_recs; | |
| 41 if (!table.ReadU16(&hdmx->version) || | |
| 42 !table.ReadS16(&num_recs) || | |
| 43 !table.ReadS32(&hdmx->size_device_record)) { | |
| 44 return OTS_FAILURE_MSG("Failed to read hdmx header"); | |
| 45 } | |
| 46 if (hdmx->version != 0) { | |
| 47 OTS_WARNING("bad version: %u", hdmx->version); | |
| 48 DROP_THIS_TABLE; | |
| 49 return true; | |
| 50 } | |
| 51 if (num_recs <= 0) { | |
| 52 OTS_WARNING("bad num_recs: %d", num_recs); | |
| 53 DROP_THIS_TABLE; | |
| 54 return true; | |
| 55 } | |
| 56 const int32_t actual_size_device_record = file->maxp->num_glyphs + 2; | |
| 57 if (hdmx->size_device_record < actual_size_device_record) { | |
| 58 OTS_WARNING("bad hdmx->size_device_record: %d", hdmx->size_device_record); | |
| 59 DROP_THIS_TABLE; | |
| 60 return true; | |
| 61 } | |
| 62 | |
| 63 hdmx->pad_len = hdmx->size_device_record - actual_size_device_record; | |
| 64 if (hdmx->pad_len > 3) { | |
| 65 return OTS_FAILURE_MSG("Bad padding %d", hdmx->pad_len); | |
| 66 } | |
| 67 | |
| 68 uint8_t last_pixel_size = 0; | |
| 69 hdmx->records.reserve(num_recs); | |
| 70 for (int i = 0; i < num_recs; ++i) { | |
| 71 OpenTypeHDMXDeviceRecord rec; | |
| 72 | |
| 73 if (!table.ReadU8(&rec.pixel_size) || | |
| 74 !table.ReadU8(&rec.max_width)) { | |
| 75 return OTS_FAILURE_MSG("Failed to read hdmx record %d", i); | |
| 76 } | |
| 77 if ((i != 0) && | |
| 78 (rec.pixel_size <= last_pixel_size)) { | |
| 79 OTS_WARNING("records are not sorted"); | |
| 80 DROP_THIS_TABLE; | |
| 81 return true; | |
| 82 } | |
| 83 last_pixel_size = rec.pixel_size; | |
| 84 | |
| 85 rec.widths.reserve(file->maxp->num_glyphs); | |
| 86 for (unsigned j = 0; j < file->maxp->num_glyphs; ++j) { | |
| 87 uint8_t width; | |
| 88 if (!table.ReadU8(&width)) { | |
| 89 return OTS_FAILURE_MSG("Failed to read glyph width %d in record %d", j, i); | |
| 90 } | |
| 91 rec.widths.push_back(width); | |
| 92 } | |
| 93 | |
| 94 if ((hdmx->pad_len > 0) && | |
| 95 !table.Skip(hdmx->pad_len)) { | |
| 96 return OTS_FAILURE_MSG("Failed to skip padding %d", hdmx->pad_len); | |
| 97 } | |
| 98 | |
| 99 hdmx->records.push_back(rec); | |
| 100 } | |
| 101 | |
| 102 return true; | |
| 103 } | |
| 104 | |
| 105 bool ots_hdmx_should_serialise(OpenTypeFile *file) { | |
| 106 if (!file->hdmx) return false; | |
| 107 if (!file->glyf) return false; // this table is not for CFF fonts. | |
| 108 return true; | |
| 109 } | |
| 110 | |
| 111 bool ots_hdmx_serialise(OTSStream *out, OpenTypeFile *file) { | |
| 112 OpenTypeHDMX * const hdmx = file->hdmx; | |
| 113 | |
| 114 if (!out->WriteU16(hdmx->version) || | |
| 115 !out->WriteS16(hdmx->records.size()) || | |
| 116 !out->WriteS32(hdmx->size_device_record)) { | |
| 117 return OTS_FAILURE_MSG("Failed to write hdmx header"); | |
| 118 } | |
| 119 | |
| 120 for (unsigned i = 0; i < hdmx->records.size(); ++i) { | |
| 121 const OpenTypeHDMXDeviceRecord& rec = hdmx->records[i]; | |
| 122 if (!out->Write(&rec.pixel_size, 1) || | |
| 123 !out->Write(&rec.max_width, 1) || | |
| 124 !out->Write(&rec.widths[0], rec.widths.size())) { | |
| 125 return OTS_FAILURE_MSG("Failed to write hdmx record %d", i); | |
| 126 } | |
| 127 if ((hdmx->pad_len > 0) && | |
| 128 !out->Write((const uint8_t *)"\x00\x00\x00", hdmx->pad_len)) { | |
| 129 return OTS_FAILURE_MSG("Failed to write hdmx padding of length %d", hdmx->pad_len); | |
| 130 } | |
| 131 } | |
| 132 | |
| 133 return true; | |
| 134 } | |
| 135 | |
| 136 void ots_hdmx_free(OpenTypeFile *file) { | |
| 137 delete file->hdmx; | |
| 138 } | |
| 139 | |
| 140 } // namespace ots |
