woff2/glyph.h

// Copyright 2013 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Data model and I/O for glyph data within sfnt format files for the purpose of
// performing the preprocessing step of the WOFF 2.0 conversion.

#ifndef WOFF2_GLYPH_H_
#define WOFF2_GLYPH_H_

#include <stddef.h>
#include <inttypes.h>
#include <vector>

namespace woff2 {

// Represents a parsed simple or composite glyph. The composite glyph data and
// instructions are un-parsed and we keep only pointers to the raw data,
// therefore the glyph is valid only so long the data from which it was parsed
// is around.
class Glyph {
 public:
  Glyph() : instructions_size(0), composite_data_size(0) {}

  // Bounding box.
  int16_t x_min;
  int16_t x_max;
  int16_t y_min;
  int16_t y_max;

  // Instructions.
  uint16_t instructions_size;
  const uint8_t* instructions_data;

  // Data model for simple glyphs.
  struct Point {
    int x;
    int y;
    bool on_curve;
  };
  std::vector<std::vector<Point> > contours;

  // Data for composite glyphs.
  const uint8_t* composite_data;
  uint32_t composite_data_size;
  bool have_instructions;
};

// Parses the glyph from the given data. Returns false on parsing failure or
// buffer overflow. The glyph is valid only so long the input data pointer is
// valid.
bool ReadGlyph(const uint8_t* data, size_t len, Glyph* glyph);

// Stores the glyph into the specified dst buffer. The *dst_size is the buffer
// size on entry and is set to the actual (unpadded) stored size on exit.
// Returns false on buffer overflow.
bool StoreGlyph(const Glyph& glyph, uint8_t* dst, size_t* dst_size);

} // namespace woff2

#endif  // WOFF2_GLYPH_H_