glyph.h - mozsearch

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/* Copyright 2013 Google Inc. All Rights Reserved.

   Distributed under MIT license.

   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT

*/

/* 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 <inttypes.h>

#include <stddef.h>

#include <cstdint>

#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),

        overlap_simple_flag_set(false),

        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;

  // Flags.

  bool overlap_simple_flag_set;

  // 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_