gfx/ots/src/ltsh.cc@6474c204b198 (annotated)
gfx/ots/src/ltsh.cc
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | // Copyright (c) 2009 The Chromium Authors. All rights reserved. |
| michael@0 | 2 | // Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 3 | // found in the LICENSE file. |
| michael@0 | 4 | |
| michael@0 | 5 | #include "ltsh.h" |
| michael@0 | 6 | |
| michael@0 | 7 | #include "maxp.h" |
| michael@0 | 8 | |
| michael@0 | 9 | // LTSH - Linear Threshold |
| michael@0 | 10 | // http://www.microsoft.com/typography/otspec/ltsh.htm |
| michael@0 | 11 | |
| michael@0 | 12 | #define TABLE_NAME "LTSH" |
| michael@0 | 13 | |
| michael@0 | 14 | #define DROP_THIS_TABLE \ |
| michael@0 | 15 | do { \ |
| michael@0 | 16 | delete file->ltsh; \ |
| michael@0 | 17 | file->ltsh = 0; \ |
| michael@0 | 18 | OTS_FAILURE_MSG("Table discarded"); \ |
| michael@0 | 19 | } while (0) |
| michael@0 | 20 | |
| michael@0 | 21 | namespace ots { |
| michael@0 | 22 | |
| michael@0 | 23 | bool ots_ltsh_parse(OpenTypeFile *file, const uint8_t *data, size_t length) { |
| michael@0 | 24 | Buffer table(data, length); |
| michael@0 | 25 | |
| michael@0 | 26 | if (!file->maxp) { |
| michael@0 | 27 | return OTS_FAILURE_MSG("Missing maxp table from font needed by ltsh"); |
| michael@0 | 28 | } |
| michael@0 | 29 | |
| michael@0 | 30 | OpenTypeLTSH *ltsh = new OpenTypeLTSH; |
| michael@0 | 31 | file->ltsh = ltsh; |
| michael@0 | 32 | |
| michael@0 | 33 | uint16_t num_glyphs = 0; |
| michael@0 | 34 | if (!table.ReadU16(<sh->version) || |
| michael@0 | 35 | !table.ReadU16(&num_glyphs)) { |
| michael@0 | 36 | return OTS_FAILURE_MSG("Failed to read ltsh header"); |
| michael@0 | 37 | } |
| michael@0 | 38 | |
| michael@0 | 39 | if (ltsh->version != 0) { |
| michael@0 | 40 | OTS_WARNING("bad version: %u", ltsh->version); |
| michael@0 | 41 | DROP_THIS_TABLE; |
| michael@0 | 42 | return true; |
| michael@0 | 43 | } |
| michael@0 | 44 | |
| michael@0 | 45 | if (num_glyphs != file->maxp->num_glyphs) { |
| michael@0 | 46 | OTS_WARNING("bad num_glyphs: %u", num_glyphs); |
| michael@0 | 47 | DROP_THIS_TABLE; |
| michael@0 | 48 | return true; |
| michael@0 | 49 | } |
| michael@0 | 50 | |
| michael@0 | 51 | ltsh->ypels.reserve(num_glyphs); |
| michael@0 | 52 | for (unsigned i = 0; i < num_glyphs; ++i) { |
| michael@0 | 53 | uint8_t pel = 0; |
| michael@0 | 54 | if (!table.ReadU8(&pel)) { |
| michael@0 | 55 | return OTS_FAILURE_MSG("Failed to read pixels for glyph %d", i); |
| michael@0 | 56 | } |
| michael@0 | 57 | ltsh->ypels.push_back(pel); |
| michael@0 | 58 | } |
| michael@0 | 59 | |
| michael@0 | 60 | return true; |
| michael@0 | 61 | } |
| michael@0 | 62 | |
| michael@0 | 63 | bool ots_ltsh_should_serialise(OpenTypeFile *file) { |
| michael@0 | 64 | if (!file->glyf) return false; // this table is not for CFF fonts. |
| michael@0 | 65 | return file->ltsh != NULL; |
| michael@0 | 66 | } |
| michael@0 | 67 | |
| michael@0 | 68 | bool ots_ltsh_serialise(OTSStream *out, OpenTypeFile *file) { |
| michael@0 | 69 | const OpenTypeLTSH *ltsh = file->ltsh; |
| michael@0 | 70 | |
| michael@0 | 71 | if (!out->WriteU16(ltsh->version) || |
| michael@0 | 72 | !out->WriteU16(ltsh->ypels.size())) { |
| michael@0 | 73 | return OTS_FAILURE_MSG("Failed to write pels size"); |
| michael@0 | 74 | } |
| michael@0 | 75 | for (unsigned i = 0; i < ltsh->ypels.size(); ++i) { |
| michael@0 | 76 | if (!out->Write(&(ltsh->ypels[i]), 1)) { |
| michael@0 | 77 | return OTS_FAILURE_MSG("Failed to write pixel size for glyph %d", i); |
| michael@0 | 78 | } |
| michael@0 | 79 | } |
| michael@0 | 80 | |
| michael@0 | 81 | return true; |
| michael@0 | 82 | } |
| michael@0 | 83 | |
| michael@0 | 84 | void ots_ltsh_free(OpenTypeFile *file) { |
| michael@0 | 85 | delete file->ltsh; |
| michael@0 | 86 | } |
| michael@0 | 87 | |
| michael@0 | 88 | } // namespace ots |
