The Tor Browser: gfx/ots/src/vorg.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 "vorg.h"

     7 #include <vector>

     9 // VORG - Vertical Origin Table

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

    12 #define TABLE_NAME "VORG"

    14 #define DROP_THIS_TABLE \

    15   do { \

    16     delete file->vorg; \

    17     file->vorg = 0; \

    18     OTS_FAILURE_MSG("Table discarded"); \

    19   } while (0)

    21 namespace ots {

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

    24   Buffer table(data, length);

    25   file->vorg = new OpenTypeVORG;

    26   OpenTypeVORG * const vorg = file->vorg;

    28   uint16_t num_recs;

    29   if (!table.ReadU16(&vorg->major_version) ||

    30       !table.ReadU16(&vorg->minor_version) ||

    31       !table.ReadS16(&vorg->default_vert_origin_y) ||

    32       !table.ReadU16(&num_recs)) {

    33     return OTS_FAILURE_MSG("Failed to read header");

    34   }

    35   if (vorg->major_version != 1) {

    36     OTS_WARNING("bad major version: %u", vorg->major_version);

    37     DROP_THIS_TABLE;

    38     return true;

    39   }

    40   if (vorg->minor_version != 0) {

    41     OTS_WARNING("bad minor version: %u", vorg->minor_version);

    42     DROP_THIS_TABLE;

    43     return true;

    44   }

    46   // num_recs might be zero (e.g., DFHSMinchoPro5-W3-Demo.otf).

    47   if (!num_recs) {

    48     return true;

    49   }

    51   uint16_t last_glyph_index = 0;

    52   vorg->metrics.reserve(num_recs);

    53   for (unsigned i = 0; i < num_recs; ++i) {

    54     OpenTypeVORGMetrics rec;

    56     if (!table.ReadU16(&rec.glyph_index) ||

    57         !table.ReadS16(&rec.vert_origin_y)) {

    58       return OTS_FAILURE_MSG("Failed to read record %d", i);

    59     }

    60     if ((i != 0) && (rec.glyph_index <= last_glyph_index)) {

    61       OTS_WARNING("the table is not sorted");

    62       DROP_THIS_TABLE;

    63       return true;

    64     }

    65     last_glyph_index = rec.glyph_index;

    67     vorg->metrics.push_back(rec);

    68   }

    70   return true;

    71 }

    73 bool ots_vorg_should_serialise(OpenTypeFile *file) {

    74   if (!file->cff) return false;  // this table is not for fonts with TT glyphs.

    75   return file->vorg != NULL;

    76 }

    78 bool ots_vorg_serialise(OTSStream *out, OpenTypeFile *file) {

    79   OpenTypeVORG * const vorg = file->vorg;

    81   if (!out->WriteU16(vorg->major_version) ||

    82       !out->WriteU16(vorg->minor_version) ||

    83       !out->WriteS16(vorg->default_vert_origin_y) ||

    84       !out->WriteU16(vorg->metrics.size())) {

    85     return OTS_FAILURE_MSG("Failed to write table header");

    86   }

    88   for (unsigned i = 0; i < vorg->metrics.size(); ++i) {

    89     const OpenTypeVORGMetrics& rec = vorg->metrics[i];

    90     if (!out->WriteU16(rec.glyph_index) ||

    91         !out->WriteS16(rec.vert_origin_y)) {

    92       return OTS_FAILURE_MSG("Failed to write record %d", i);

    93     }

    94   }

    96   return true;

    97 }

    99 void ots_vorg_free(OpenTypeFile *file) {

   100   delete file->vorg;

   101 }

   103 }  // namespace ots

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