third_party/woff2/src/glyph.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 // Data model and I/O for glyph data within sfnt format files for the purpose of
  16 // performing the preprocessing step of the WOFF 2.0 conversion.
  17
  18 #ifndef WOFF2_GLYPH_H_
  19 #define WOFF2_GLYPH_H_
  20
  21 #include <stddef.h>
  22 #include <inttypes.h>
  23 #include <vector>
  24
  25 namespace woff2 {
  26
  27 // Represents a parsed simple or composite glyph. The composite glyph data and
  28 // instructions are un-parsed and we keep only pointers to the raw data,
  29 // therefore the glyph is valid only so long the data from which it was parsed
  30 // is around.
  31 class Glyph {
  32  public:
  33   Glyph() : instructions_size(0), composite_data_size(0) {}
  34
  35   // Bounding box.
  36   int16_t x_min;
  37   int16_t x_max;
  38   int16_t y_min;
  39   int16_t y_max;
  40
  41   // Instructions.
  42   uint16_t instructions_size;
  43   const uint8_t* instructions_data;
  44
  45   // Data model for simple glyphs.
  46   struct Point {
  47     int x;
  48     int y;
  49     bool on_curve;
  50   };
  51   std::vector<std::vector<Point> > contours;
  52
  53   // Data for composite glyphs.
  54   const uint8_t* composite_data;
  55   uint32_t composite_data_size;
  56   bool have_instructions;
  57 };
  58
  59 // Parses the glyph from the given data. Returns false on parsing failure or
  60 // buffer overflow. The glyph is valid only so long the input data pointer is
  61 // valid.
  62 bool ReadGlyph(const uint8_t* data, size_t len, Glyph* glyph);
  63
  64 // Stores the glyph into the specified dst buffer. The *dst_size is the buffer
  65 // size on entry and is set to the actual (unpadded) stored size on exit.
  66 // Returns false on buffer overflow.
  67 bool StoreGlyph(const Glyph& glyph, uint8_t* dst, size_t* dst_size);
  68
  69 } // namespace woff2
  70
  71 #endif  // WOFF2_GLYPH_H_