third_party/ots/src/maxp.cc

   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 "maxp.h"
   6
   7 // maxp - Maximum Profile
   8 // http://www.microsoft.com/typography/otspec/maxp.htm
   9
  10 #define TABLE_NAME "maxp"
  11
  12 namespace ots {
  13
  14 bool ots_maxp_parse(Font *font, const uint8_t *data, size_t length) {
  15   Buffer table(data, length);
  16
  17   OpenTypeMAXP *maxp = new OpenTypeMAXP;
  18   font->maxp = maxp;
  19
  20   uint32_t version = 0;
  21   if (!table.ReadU32(&version)) {
  22     return OTS_FAILURE_MSG("Failed to read version of maxp table");
  23   }
  24
  25   if (version >> 16 > 1) {
  26     return OTS_FAILURE_MSG("Bad maxp version %d", version);
  27   }
  28
  29   if (!table.ReadU16(&maxp->num_glyphs)) {
  30     return OTS_FAILURE_MSG("Failed to read number of glyphs from maxp table");
  31   }
  32
  33   if (!maxp->num_glyphs) {
  34     return OTS_FAILURE_MSG("Bad number of glyphs 0 in maxp table");
  35   }
  36
  37   if (version >> 16 == 1) {
  38     maxp->version_1 = true;
  39     if (!table.ReadU16(&maxp->max_points) ||
  40         !table.ReadU16(&maxp->max_contours) ||
  41         !table.ReadU16(&maxp->max_c_points) ||
  42         !table.ReadU16(&maxp->max_c_contours) ||
  43         !table.ReadU16(&maxp->max_zones) ||
  44         !table.ReadU16(&maxp->max_t_points) ||
  45         !table.ReadU16(&maxp->max_storage) ||
  46         !table.ReadU16(&maxp->max_fdefs) ||
  47         !table.ReadU16(&maxp->max_idefs) ||
  48         !table.ReadU16(&maxp->max_stack) ||
  49         !table.ReadU16(&maxp->max_size_glyf_instructions) ||
  50         !table.ReadU16(&maxp->max_c_components) ||
  51         !table.ReadU16(&maxp->max_c_depth)) {
  52       return OTS_FAILURE_MSG("Failed to read maxp table");
  53     }
  54
  55     if (maxp->max_zones == 0) {
  56       // workaround for ipa*.ttf Japanese fonts.
  57       OTS_WARNING("bad max_zones: %u", maxp->max_zones);
  58       maxp->max_zones = 1;
  59     } else if (maxp->max_zones == 3) {
  60       // workaround for Ecolier-*.ttf fonts.
  61       OTS_WARNING("bad max_zones: %u", maxp->max_zones);
  62       maxp->max_zones = 2;
  63     }
  64
  65     if ((maxp->max_zones != 1) && (maxp->max_zones != 2)) {
  66       return OTS_FAILURE_MSG("Bad max zones %d in maxp", maxp->max_zones);
  67     }
  68   } else {
  69     maxp->version_1 = false;
  70   }
  71
  72   return true;
  73 }
  74
  75 bool ots_maxp_should_serialise(Font *font) {
  76   return font->maxp != NULL;
  77 }
  78
  79 bool ots_maxp_serialise(OTSStream *out, Font *font) {
  80   const OpenTypeMAXP *maxp = font->maxp;
  81
  82   if (!out->WriteU32(maxp->version_1 ? 0x00010000 : 0x00005000) ||
  83       !out->WriteU16(maxp->num_glyphs)) {
  84     return OTS_FAILURE_MSG("Failed to write maxp version or number of glyphs");
  85   }
  86
  87   if (!maxp->version_1) return true;
  88
  89   if (!out->WriteU16(maxp->max_points) ||
  90       !out->WriteU16(maxp->max_contours) ||
  91       !out->WriteU16(maxp->max_c_points) ||
  92       !out->WriteU16(maxp->max_c_contours)) {
  93     return OTS_FAILURE_MSG("Failed to write maxp");
  94   }
  95
  96   if (!out->WriteU16(maxp->max_zones) ||
  97       !out->WriteU16(maxp->max_t_points) ||
  98       !out->WriteU16(maxp->max_storage) ||
  99       !out->WriteU16(maxp->max_fdefs) ||
 100       !out->WriteU16(maxp->max_idefs) ||
 101       !out->WriteU16(maxp->max_stack) ||
 102       !out->WriteU16(maxp->max_size_glyf_instructions)) {
 103     return OTS_FAILURE_MSG("Failed to write more maxp");
 104   }
 105
 106   if (!out->WriteU16(maxp->max_c_components) ||
 107       !out->WriteU16(maxp->max_c_depth)) {
 108     return OTS_FAILURE_MSG("Failed to write yet more maxp");
 109   }
 110
 111   return true;
 112 }
 113
 114 void ots_maxp_reuse(Font *font, Font *other) {
 115   font->maxp = other->maxp;
 116   font->maxp_reused = true;
 117 }
 118
 119 void ots_maxp_free(Font *font) {
 120   delete font->maxp;
 121 }
 122
 123 }  // namespace ots
 124
 125 #undef TABLE_NAME