LCOV - code coverage report
Current view: directory - gfx/ots/src - hdmx.cc (source / functions) Found Hit Coverage
Test: app.info Lines: 70 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 "hdmx.h"
       6                 : #include "head.h"
       7                 : #include "maxp.h"
       8                 : 
       9                 : // hdmx - Horizontal Device Metrics
      10                 : // http://www.microsoft.com/opentype/otspec/hdmx.htm
      11                 : 
      12                 : #define DROP_THIS_TABLE \
      13                 :   do { delete file->hdmx; file->hdmx = 0; } while (0)
      14                 : 
      15                 : namespace ots {
      16                 : 
      17               0 : bool ots_hdmx_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
      18               0 :   Buffer table(data, length);
      19               0 :   file->hdmx = new OpenTypeHDMX;
      20               0 :   OpenTypeHDMX * const hdmx = file->hdmx;
      21                 : 
      22               0 :   if (!file->head || !file->maxp) {
      23               0 :     return OTS_FAILURE();
      24                 :   }
      25                 : 
      26               0 :   if ((file->head->flags & 0x14) == 0) {
      27                 :     // http://www.microsoft.com/typography/otspec/recom.htm
      28                 :     OTS_WARNING("the table should not be present when bit 2 and 4 of the "
      29                 :                 "head->flags are not set");
      30               0 :     DROP_THIS_TABLE;
      31               0 :     return true;
      32                 :   }
      33                 : 
      34                 :   int16_t num_recs;
      35               0 :   if (!table.ReadU16(&hdmx->version) ||
      36               0 :       !table.ReadS16(&num_recs) ||
      37               0 :       !table.ReadS32(&hdmx->size_device_record)) {
      38               0 :     return OTS_FAILURE();
      39                 :   }
      40               0 :   if (hdmx->version != 0) {
      41                 :     OTS_WARNING("bad version: %u", hdmx->version);
      42               0 :     DROP_THIS_TABLE;
      43               0 :     return true;
      44                 :   }
      45               0 :   if (num_recs <= 0) {
      46                 :     OTS_WARNING("bad num_recs: %d", num_recs);
      47               0 :     DROP_THIS_TABLE;
      48               0 :     return true;
      49                 :   }
      50               0 :   const int32_t actual_size_device_record = file->maxp->num_glyphs + 2;
      51               0 :   if (hdmx->size_device_record < actual_size_device_record) {
      52                 :     OTS_WARNING("bad hdmx->size_device_record: %d", hdmx->size_device_record);
      53               0 :     DROP_THIS_TABLE;
      54               0 :     return true;
      55                 :   }
      56                 : 
      57               0 :   hdmx->pad_len = hdmx->size_device_record - actual_size_device_record;
      58               0 :   if (hdmx->pad_len > 3) {
      59               0 :     return OTS_FAILURE();
      60                 :   }
      61                 : 
      62               0 :   uint8_t last_pixel_size = 0;
      63               0 :   hdmx->records.reserve(num_recs);
      64               0 :   for (int i = 0; i < num_recs; ++i) {
      65               0 :     OpenTypeHDMXDeviceRecord rec;
      66                 : 
      67               0 :     if (!table.ReadU8(&rec.pixel_size) ||
      68               0 :         !table.ReadU8(&rec.max_width)) {
      69               0 :       return OTS_FAILURE();
      70                 :     }
      71               0 :     if ((i != 0) &&
      72                 :         (rec.pixel_size <= last_pixel_size)) {
      73                 :       OTS_WARNING("records are not sorted");
      74               0 :       DROP_THIS_TABLE;
      75               0 :       return true;
      76                 :     }
      77               0 :     last_pixel_size = rec.pixel_size;
      78                 : 
      79               0 :     rec.widths.reserve(file->maxp->num_glyphs);
      80               0 :     for (unsigned j = 0; j < file->maxp->num_glyphs; ++j) {
      81                 :       uint8_t width;
      82               0 :       if (!table.ReadU8(&width)) {
      83               0 :         return OTS_FAILURE();
      84                 :       }
      85               0 :       rec.widths.push_back(width);
      86                 :     }
      87                 : 
      88               0 :     if ((hdmx->pad_len > 0) &&
      89               0 :         !table.Skip(hdmx->pad_len)) {
      90               0 :       return OTS_FAILURE();
      91                 :     }
      92                 : 
      93               0 :     hdmx->records.push_back(rec);
      94                 :   }
      95                 : 
      96               0 :   return true;
      97                 : }
      98                 : 
      99               0 : bool ots_hdmx_should_serialise(OpenTypeFile *file) {
     100               0 :   if (!file->hdmx) return false;
     101               0 :   if (!file->glyf) return false;  // this table is not for CFF fonts.
     102               0 :   return true;
     103                 : }
     104                 : 
     105               0 : bool ots_hdmx_serialise(OTSStream *out, OpenTypeFile *file) {
     106               0 :   OpenTypeHDMX * const hdmx = file->hdmx;
     107                 : 
     108               0 :   if (!out->WriteU16(hdmx->version) ||
     109               0 :       !out->WriteS16(hdmx->records.size()) ||
     110               0 :       !out->WriteS32(hdmx->size_device_record)) {
     111               0 :     return OTS_FAILURE();
     112                 :   }
     113                 : 
     114               0 :   for (unsigned i = 0; i < hdmx->records.size(); ++i) {
     115               0 :     const OpenTypeHDMXDeviceRecord& rec = hdmx->records[i];
     116               0 :     if (!out->Write(&rec.pixel_size, 1) ||
     117               0 :         !out->Write(&rec.max_width, 1) ||
     118               0 :         !out->Write(&rec.widths[0], rec.widths.size())) {
     119               0 :       return OTS_FAILURE();
     120                 :     }
     121               0 :     if ((hdmx->pad_len > 0) &&
     122               0 :         !out->Write((const uint8_t *)"\x00\x00\x00", hdmx->pad_len)) {
     123               0 :       return OTS_FAILURE();
     124                 :     }
     125                 :   }
     126                 : 
     127               0 :   return true;
     128                 : }
     129                 : 
     130               0 : void ots_hdmx_free(OpenTypeFile *file) {
     131               0 :   delete file->hdmx;
     132               0 : }
     133                 : 
     134                 : }  // namespace ots

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