third_party/woff2/src/normalize.h

   1 // Copyright 2013 Google Inc. All Rights Reserved.
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 // http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14 //
  15 // Functions for normalizing fonts. Since the WOFF 2.0 decoder creates font
  16 // files in normalized form, the WOFF 2.0 conversion is guaranteed to be
  17 // lossless (in a bitwise sense) only for normalized font files.
  18
  19 #ifndef WOFF2_NORMALIZE_H_
  20 #define WOFF2_NORMALIZE_H_
  21
  22 namespace woff2 {
  23
  24 struct Font;
  25
  26 // Changes the offset fields of the table headers so that the data for the
  27 // tables will be written in order of increasing tag values, without any gaps
  28 // other than the 4-byte padding.
  29 bool NormalizeOffsets(Font* font);
  30
  31 // Changes the checksum fields of the table headers and the checksum field of
  32 // the head table so that it matches the current data.
  33 bool FixChecksums(Font* font);
  34
  35 // Parses each of the glyphs in the font and writes them again to the glyf
  36 // table in normalized form, as defined by the StoreGlyph() function. Changes
  37 // the loca table accordigly.
  38 bool NormalizeGlyphs(Font* font);
  39
  40 // Performs all of the normalization steps above.
  41 bool NormalizeFont(Font* font);
  42
  43 } // namespace woff2
  44
  45 #endif  // WOFF2_NORMALIZE_H_