LCOV - code coverage report
Current view: directory - gfx/ots/src - vdmx.cc (source / functions) Found Hit Coverage
Test: app.info Lines: 93 0 0.0 %
Date: 2012-06-02 Functions: 4 0 0.0 %

       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 "vdmx.h"
       6                 : 
       7                 : // VDMX - Vertical Device Metrics
       8                 : // http://www.microsoft.com/opentype/otspec/vdmx.htm
       9                 : 
      10                 : #define DROP_THIS_TABLE \
      11                 :   do { delete file->vdmx; file->vdmx = 0; } while (0)
      12                 : 
      13                 : namespace ots {
      14                 : 
      15               0 : bool ots_vdmx_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
      16               0 :   Buffer table(data, length);
      17               0 :   file->vdmx = new OpenTypeVDMX;
      18               0 :   OpenTypeVDMX * const vdmx = file->vdmx;
      19                 : 
      20               0 :   if (!table.ReadU16(&vdmx->version) ||
      21               0 :       !table.ReadU16(&vdmx->num_recs) ||
      22               0 :       !table.ReadU16(&vdmx->num_ratios)) {
      23               0 :     return OTS_FAILURE();
      24                 :   }
      25                 : 
      26               0 :   if (vdmx->version > 1) {
      27                 :     OTS_WARNING("bad version: %u", vdmx->version);
      28               0 :     DROP_THIS_TABLE;
      29               0 :     return true;  // continue transcoding
      30                 :   }
      31                 : 
      32               0 :   vdmx->rat_ranges.reserve(vdmx->num_ratios);
      33               0 :   for (unsigned i = 0; i < vdmx->num_ratios; ++i) {
      34                 :     OpenTypeVDMXRatioRecord rec;
      35                 : 
      36               0 :     if (!table.ReadU8(&rec.charset) ||
      37               0 :         !table.ReadU8(&rec.x_ratio) ||
      38               0 :         !table.ReadU8(&rec.y_start_ratio) ||
      39               0 :         !table.ReadU8(&rec.y_end_ratio)) {
      40               0 :       return OTS_FAILURE();
      41                 :     }
      42                 : 
      43               0 :     if (rec.charset > 1) {
      44                 :       OTS_WARNING("bad charset: %u", rec.charset);
      45               0 :       DROP_THIS_TABLE;
      46               0 :       return true;
      47                 :     }
      48                 : 
      49               0 :     if (rec.y_start_ratio > rec.y_end_ratio) {
      50                 :       OTS_WARNING("bad y ratio");
      51               0 :       DROP_THIS_TABLE;
      52               0 :       return true;
      53                 :     }
      54                 : 
      55                 :     // All values set to zero signal the default grouping to use;
      56                 :     // if present, this must be the last Ratio group in the table.
      57               0 :     if ((i < vdmx->num_ratios - 1u) &&
      58                 :         (rec.x_ratio == 0) &&
      59                 :         (rec.y_start_ratio == 0) &&
      60                 :         (rec.y_end_ratio == 0)) {
      61                 :       // workaround for fonts which have 2 or more {0, 0, 0} terminators.
      62                 :       OTS_WARNING("superfluous terminator found");
      63               0 :       DROP_THIS_TABLE;
      64               0 :       return true;
      65                 :     }
      66                 : 
      67               0 :     vdmx->rat_ranges.push_back(rec);
      68                 :   }
      69                 : 
      70               0 :   vdmx->offsets.reserve(vdmx->num_ratios);
      71               0 :   const size_t current_offset = table.offset();
      72                 :   // current_offset is less than (2 bytes * 3) + (4 bytes * USHRT_MAX) = 256k.
      73               0 :   for (unsigned i = 0; i < vdmx->num_ratios; ++i) {
      74                 :     uint16_t offset;
      75               0 :     if (!table.ReadU16(&offset)) {
      76               0 :       return OTS_FAILURE();
      77                 :     }
      78               0 :     if (current_offset + offset >= length) {  // thus doesn't overflow.
      79               0 :       return OTS_FAILURE();
      80                 :     }
      81                 : 
      82               0 :     vdmx->offsets.push_back(offset);
      83                 :   }
      84                 : 
      85               0 :   vdmx->groups.reserve(vdmx->num_recs);
      86               0 :   for (unsigned i = 0; i < vdmx->num_recs; ++i) {
      87               0 :     OpenTypeVDMXGroup group;
      88               0 :     if (!table.ReadU16(&group.recs) ||
      89               0 :         !table.ReadU8(&group.startsz) ||
      90               0 :         !table.ReadU8(&group.endsz)) {
      91               0 :       return OTS_FAILURE();
      92                 :     }
      93               0 :     group.entries.reserve(group.recs);
      94               0 :     for (unsigned j = 0; j < group.recs; ++j) {
      95                 :       OpenTypeVDMXVTable vt;
      96               0 :       if (!table.ReadU16(&vt.y_pel_height) ||
      97               0 :           !table.ReadS16(&vt.y_max) ||
      98               0 :           !table.ReadS16(&vt.y_min)) {
      99               0 :         return OTS_FAILURE();
     100                 :       }
     101               0 :       if (vt.y_max < vt.y_min) {
     102                 :         OTS_WARNING("bad y min/max");
     103               0 :         DROP_THIS_TABLE;
     104               0 :         return true;
     105                 :       }
     106                 : 
     107                 :       // This table must appear in sorted order (sorted by yPelHeight),
     108                 :       // but need not be continuous.
     109               0 :       if ((j != 0) && (group.entries[j - 1].y_pel_height >= vt.y_pel_height)) {
     110                 :         OTS_WARNING("the table is not sorted");
     111               0 :         DROP_THIS_TABLE;
     112               0 :         return true;
     113                 :       }
     114                 : 
     115               0 :       group.entries.push_back(vt);
     116                 :     }
     117               0 :     vdmx->groups.push_back(group);
     118                 :   }
     119                 : 
     120               0 :   return true;
     121                 : }
     122                 : 
     123               0 : bool ots_vdmx_should_serialise(OpenTypeFile *file) {
     124               0 :   if (!file->glyf) return false;  // this table is not for CFF fonts.
     125               0 :   return file->vdmx != NULL;
     126                 : }
     127                 : 
     128               0 : bool ots_vdmx_serialise(OTSStream *out, OpenTypeFile *file) {
     129               0 :   OpenTypeVDMX * const vdmx = file->vdmx;
     130                 : 
     131               0 :   if (!out->WriteU16(vdmx->version) ||
     132               0 :       !out->WriteU16(vdmx->num_recs) ||
     133               0 :       !out->WriteU16(vdmx->num_ratios)) {
     134               0 :     return OTS_FAILURE();
     135                 :   }
     136                 : 
     137               0 :   for (unsigned i = 0; i < vdmx->rat_ranges.size(); ++i) {
     138               0 :     const OpenTypeVDMXRatioRecord& rec = vdmx->rat_ranges[i];
     139               0 :     if (!out->Write(&rec.charset, 1) ||
     140               0 :         !out->Write(&rec.x_ratio, 1) ||
     141               0 :         !out->Write(&rec.y_start_ratio, 1) ||
     142               0 :         !out->Write(&rec.y_end_ratio, 1)) {
     143               0 :       return OTS_FAILURE();
     144                 :     }
     145                 :   }
     146                 : 
     147               0 :   for (unsigned i = 0; i < vdmx->offsets.size(); ++i) {
     148               0 :     if (!out->WriteU16(vdmx->offsets[i])) {
     149               0 :       return OTS_FAILURE();
     150                 :     }
     151                 :   }
     152                 : 
     153               0 :   for (unsigned i = 0; i < vdmx->groups.size(); ++i) {
     154               0 :     const OpenTypeVDMXGroup& group = vdmx->groups[i];
     155               0 :     if (!out->WriteU16(group.recs) ||
     156               0 :         !out->Write(&group.startsz, 1) ||
     157               0 :         !out->Write(&group.endsz, 1)) {
     158               0 :       return OTS_FAILURE();
     159                 :     }
     160               0 :     for (unsigned j = 0; j < group.entries.size(); ++j) {
     161               0 :       const OpenTypeVDMXVTable& vt = group.entries[j];
     162               0 :       if (!out->WriteU16(vt.y_pel_height) ||
     163               0 :           !out->WriteS16(vt.y_max) ||
     164               0 :           !out->WriteS16(vt.y_min)) {
     165               0 :         return OTS_FAILURE();
     166                 :       }
     167                 :     }
     168                 :   }
     169                 : 
     170               0 :   return true;
     171                 : }
     172                 : 
     173               0 : void ots_vdmx_free(OpenTypeFile *file) {
     174               0 :   delete file->vdmx;
     175               0 : }
     176                 : 
     177                 : }  // namespace ots

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