1  /****************************************************************************
       2   *
       3   * sfwoff2.h
       4   *
       5   *   WOFFF2 format management (specification).
       6   *
       7   * Copyright (C) 2019-2023 by
       8   * Nikhil Ramakrishnan, David Turner, Robert Wilhelm, and Werner Lemberg.
       9   *
      10   * This file is part of the FreeType project, and may only be used,
      11   * modified, and distributed under the terms of the FreeType project
      12   * license, LICENSE.TXT.  By continuing to use, modify, or distribute
      13   * this file you indicate that you have read the license and
      14   * understand and accept it fully.
      15   *
      16   */
      17  
      18  
      19  #ifndef SFWOFF2_H_
      20  #define SFWOFF2_H_
      21  
      22  
      23  #include <freetype/internal/sfnt.h>
      24  #include <freetype/internal/ftobjs.h>
      25  
      26  
      27  FT_BEGIN_HEADER
      28  
      29  #ifdef FT_CONFIG_OPTION_USE_BROTLI
      30  
      31    /* Leave the first byte open to store `flag_byte'. */
      32  #define WOFF2_FLAGS_TRANSFORM   1 << 8
      33  
      34  #define WOFF2_SFNT_HEADER_SIZE  12
      35  #define WOFF2_SFNT_ENTRY_SIZE   16
      36  
      37    /* Suggested maximum size for output. */
      38  #define WOFF2_DEFAULT_MAX_SIZE  30 * 1024 * 1024
      39  
      40    /* 98% of Google Fonts have no glyph above 5k bytes. */
      41  #define WOFF2_DEFAULT_GLYPH_BUF  5120
      42  
      43    /* Composite glyph flags.                                      */
      44    /* See `CompositeGlyph.java' in `sfntly' for full definitions. */
      45  #define FLAG_ARG_1_AND_2_ARE_WORDS     1 << 0
      46  #define FLAG_WE_HAVE_A_SCALE           1 << 3
      47  #define FLAG_MORE_COMPONENTS           1 << 5
      48  #define FLAG_WE_HAVE_AN_X_AND_Y_SCALE  1 << 6
      49  #define FLAG_WE_HAVE_A_TWO_BY_TWO      1 << 7
      50  #define FLAG_WE_HAVE_INSTRUCTIONS      1 << 8
      51  
      52    /* Simple glyph flags */
      53  #define GLYF_ON_CURVE        1 << 0
      54  #define GLYF_X_SHORT         1 << 1
      55  #define GLYF_Y_SHORT         1 << 2
      56  #define GLYF_REPEAT          1 << 3
      57  #define GLYF_THIS_X_IS_SAME  1 << 4
      58  #define GLYF_THIS_Y_IS_SAME  1 << 5
      59  #define GLYF_OVERLAP_SIMPLE  1 << 6
      60  
      61    /* Other constants */
      62  #define CONTOUR_OFFSET_END_POINT  10
      63  
      64  
      65    FT_LOCAL( FT_Error )
      66    woff2_open_font( FT_Stream  stream,
      67                     TT_Face    face,
      68                     FT_Int*    face_index,
      69                     FT_Long*   num_faces );
      70  
      71  #endif /* FT_CONFIG_OPTION_USE_BROTLI */
      72  
      73  FT_END_HEADER
      74  
      75  #endif /* SFWOFF2_H_ */
      76  
      77  
      78  /* END */