The Tor Browser / file comparison
comparison: gfx/ots/src/ltsh.cc
gfx/ots/src/ltsh.cc
- changeset 0
- 6474c204b198
equal
deleted
inserted
replaced
| -1:000000000000 | 0:bb8c4b2b6139 |
|---|---|
| 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 "ltsh.h" | |
| 6 | |
| 7 #include "maxp.h" | |
| 8 | |
| 9 // LTSH - Linear Threshold | |
| 10 // http://www.microsoft.com/typography/otspec/ltsh.htm | |
| 11 | |
| 12 #define TABLE_NAME "LTSH" | |
| 13 | |
| 14 #define DROP_THIS_TABLE \ | |
| 15 do { \ | |
| 16 delete file->ltsh; \ | |
| 17 file->ltsh = 0; \ | |
| 18 OTS_FAILURE_MSG("Table discarded"); \ | |
| 19 } while (0) | |
| 20 | |
| 21 namespace ots { | |
| 22 | |
| 23 bool ots_ltsh_parse(OpenTypeFile *file, const uint8_t *data, size_t length) { | |
| 24 Buffer table(data, length); | |
| 25 | |
| 26 if (!file->maxp) { | |
| 27 return OTS_FAILURE_MSG("Missing maxp table from font needed by ltsh"); | |
| 28 } | |
| 29 | |
| 30 OpenTypeLTSH *ltsh = new OpenTypeLTSH; | |
| 31 file->ltsh = ltsh; | |
| 32 | |
| 33 uint16_t num_glyphs = 0; | |
| 34 if (!table.ReadU16(<sh->version) || | |
| 35 !table.ReadU16(&num_glyphs)) { | |
| 36 return OTS_FAILURE_MSG("Failed to read ltsh header"); | |
| 37 } | |
| 38 | |
| 39 if (ltsh->version != 0) { | |
| 40 OTS_WARNING("bad version: %u", ltsh->version); | |
| 41 DROP_THIS_TABLE; | |
| 42 return true; | |
| 43 } | |
| 44 | |
| 45 if (num_glyphs != file->maxp->num_glyphs) { | |
| 46 OTS_WARNING("bad num_glyphs: %u", num_glyphs); | |
| 47 DROP_THIS_TABLE; | |
| 48 return true; | |
| 49 } | |
| 50 | |
| 51 ltsh->ypels.reserve(num_glyphs); | |
| 52 for (unsigned i = 0; i < num_glyphs; ++i) { | |
| 53 uint8_t pel = 0; | |
| 54 if (!table.ReadU8(&pel)) { | |
| 55 return OTS_FAILURE_MSG("Failed to read pixels for glyph %d", i); | |
| 56 } | |
| 57 ltsh->ypels.push_back(pel); | |
| 58 } | |
| 59 | |
| 60 return true; | |
| 61 } | |
| 62 | |
| 63 bool ots_ltsh_should_serialise(OpenTypeFile *file) { | |
| 64 if (!file->glyf) return false; // this table is not for CFF fonts. | |
| 65 return file->ltsh != NULL; | |
| 66 } | |
| 67 | |
| 68 bool ots_ltsh_serialise(OTSStream *out, OpenTypeFile *file) { | |
| 69 const OpenTypeLTSH *ltsh = file->ltsh; | |
| 70 | |
| 71 if (!out->WriteU16(ltsh->version) || | |
| 72 !out->WriteU16(ltsh->ypels.size())) { | |
| 73 return OTS_FAILURE_MSG("Failed to write pels size"); | |
| 74 } | |
| 75 for (unsigned i = 0; i < ltsh->ypels.size(); ++i) { | |
| 76 if (!out->Write(&(ltsh->ypels[i]), 1)) { | |
| 77 return OTS_FAILURE_MSG("Failed to write pixel size for glyph %d", i); | |
| 78 } | |
| 79 } | |
| 80 | |
| 81 return true; | |
| 82 } | |
| 83 | |
| 84 void ots_ltsh_free(OpenTypeFile *file) { | |
| 85 delete file->ltsh; | |
| 86 } | |
| 87 | |
| 88 } // namespace ots |
