The Tor Browser: gfx/ots/src/ltsh.cc@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     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.

     5 #include "ltsh.h"

     7 #include "maxp.h"

     9 // LTSH - Linear Threshold

    10 // http://www.microsoft.com/typography/otspec/ltsh.htm

    12 #define TABLE_NAME "LTSH"

    14 #define DROP_THIS_TABLE \

    15   do { \

    16     delete file->ltsh; \

    17     file->ltsh = 0; \

    18     OTS_FAILURE_MSG("Table discarded"); \

    19   } while (0)

    21 namespace ots {

    23 bool ots_ltsh_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {

    24   Buffer table(data, length);

    26   if (!file->maxp) {

    27     return OTS_FAILURE_MSG("Missing maxp table from font needed by ltsh");

    28   }

    30   OpenTypeLTSH *ltsh = new OpenTypeLTSH;

    31   file->ltsh = ltsh;

    33   uint16_t num_glyphs = 0;

    34   if (!table.ReadU16(&ltsh->version) ||

    35       !table.ReadU16(&num_glyphs)) {

    36     return OTS_FAILURE_MSG("Failed to read ltsh header");

    37   }

    39   if (ltsh->version != 0) {

    40     OTS_WARNING("bad version: %u", ltsh->version);

    41     DROP_THIS_TABLE;

    42     return true;

    43   }

    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   }

    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   }

    60   return true;

    61 }

    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 }

    68 bool ots_ltsh_serialise(OTSStream *out, OpenTypeFile *file) {

    69   const OpenTypeLTSH *ltsh = file->ltsh;

    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   }

    81   return true;

    82 }

    84 void ots_ltsh_free(OpenTypeFile *file) {

    85   delete file->ltsh;

    86 }

    88 }  // namespace ots

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