Quelle glyph.h Sprache: C

/* 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_

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