The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/gfx/ots/src/ltsh.cc	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,88 @@
     1.4 +// Copyright (c) 2009 The Chromium Authors. All rights reserved.
     1.5 +// Use of this source code is governed by a BSD-style license that can be
     1.6 +// found in the LICENSE file.
     1.7 +
     1.8 +#include "ltsh.h"
     1.9 +
    1.10 +#include "maxp.h"
    1.11 +
    1.12 +// LTSH - Linear Threshold
    1.13 +// http://www.microsoft.com/typography/otspec/ltsh.htm
    1.14 +
    1.15 +#define TABLE_NAME "LTSH"
    1.16 +
    1.17 +#define DROP_THIS_TABLE \
    1.18 +  do { \
    1.19 +    delete file->ltsh; \
    1.20 +    file->ltsh = 0; \
    1.21 +    OTS_FAILURE_MSG("Table discarded"); \
    1.22 +  } while (0)
    1.23 +
    1.24 +namespace ots {
    1.25 +
    1.26 +bool ots_ltsh_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
    1.27 +  Buffer table(data, length);
    1.28 +
    1.29 +  if (!file->maxp) {
    1.30 +    return OTS_FAILURE_MSG("Missing maxp table from font needed by ltsh");
    1.31 +  }
    1.32 +
    1.33 +  OpenTypeLTSH *ltsh = new OpenTypeLTSH;
    1.34 +  file->ltsh = ltsh;
    1.35 +
    1.36 +  uint16_t num_glyphs = 0;
    1.37 +  if (!table.ReadU16(&ltsh->version) ||
    1.38 +      !table.ReadU16(&num_glyphs)) {
    1.39 +    return OTS_FAILURE_MSG("Failed to read ltsh header");
    1.40 +  }
    1.41 +
    1.42 +  if (ltsh->version != 0) {
    1.43 +    OTS_WARNING("bad version: %u", ltsh->version);
    1.44 +    DROP_THIS_TABLE;
    1.45 +    return true;
    1.46 +  }
    1.47 +
    1.48 +  if (num_glyphs != file->maxp->num_glyphs) {
    1.49 +    OTS_WARNING("bad num_glyphs: %u", num_glyphs);
    1.50 +    DROP_THIS_TABLE;
    1.51 +    return true;
    1.52 +  }
    1.53 +
    1.54 +  ltsh->ypels.reserve(num_glyphs);
    1.55 +  for (unsigned i = 0; i < num_glyphs; ++i) {
    1.56 +    uint8_t pel = 0;
    1.57 +    if (!table.ReadU8(&pel)) {
    1.58 +      return OTS_FAILURE_MSG("Failed to read pixels for glyph %d", i);
    1.59 +    }
    1.60 +    ltsh->ypels.push_back(pel);
    1.61 +  }
    1.62 +
    1.63 +  return true;
    1.64 +}
    1.65 +
    1.66 +bool ots_ltsh_should_serialise(OpenTypeFile *file) {
    1.67 +  if (!file->glyf) return false;  // this table is not for CFF fonts.
    1.68 +  return file->ltsh != NULL;
    1.69 +}
    1.70 +
    1.71 +bool ots_ltsh_serialise(OTSStream *out, OpenTypeFile *file) {
    1.72 +  const OpenTypeLTSH *ltsh = file->ltsh;
    1.73 +
    1.74 +  if (!out->WriteU16(ltsh->version) ||
    1.75 +      !out->WriteU16(ltsh->ypels.size())) {
    1.76 +    return OTS_FAILURE_MSG("Failed to write pels size");
    1.77 +  }
    1.78 +  for (unsigned i = 0; i < ltsh->ypels.size(); ++i) {
    1.79 +    if (!out->Write(&(ltsh->ypels[i]), 1)) {
    1.80 +      return OTS_FAILURE_MSG("Failed to write pixel size for glyph %d", i);
    1.81 +    }
    1.82 +  }
    1.83 +
    1.84 +  return true;
    1.85 +}
    1.86 +
    1.87 +void ots_ltsh_free(OpenTypeFile *file) {
    1.88 +  delete file->ltsh;
    1.89 +}
    1.90 +
    1.91 +}  // namespace ots