1 /*

     2  * Copyright © 2011,2012  Google, Inc.

     3  *

     4  *  This is part of HarfBuzz, a text shaping library.

     5  *

     6  * Permission is hereby granted, without written agreement and without

     7  * license or royalty fees, to use, copy, modify, and distribute this

     8  * software and its documentation for any purpose, provided that the

     9  * above copyright notice and the following two paragraphs appear in

    10  * all copies of this software.

    11  *

    12  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR

    13  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES

    14  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN

    15  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH

    16  * DAMAGE.

    17  *

    18  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,

    19  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

    20  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS

    21  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO

    22  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

    23  *

    24  * Google Author(s): Behdad Esfahbod

    25  */

    26 

    27 #ifndef HB_OT_HHEA_TABLE_HH

    28 #define HB_OT_HHEA_TABLE_HH

    29 

    30 #include "hb-open-type-private.hh"

    31 

    32 

    33 namespace OT {

    34 

    35 

    36 /*

    37  * hhea -- The Horizontal Header Table

    38  * vhea -- The Vertical Header Table

    39  */

    40 

    41 #define HB_OT_TAG_hhea HB_TAG('h','h','e','a')

    42 #define HB_OT_TAG_vhea HB_TAG('v','h','e','a')

    43 

    44 

    45 struct _hea

    46 {

    47   static const hb_tag_t tableTag = HB_TAG('_','h','e','a');

    48 

    49   static const hb_tag_t hheaTag = HB_OT_TAG_hhea;

    50   static const hb_tag_t vheaTag = HB_OT_TAG_vhea;

    51 

    52   inline bool sanitize (hb_sanitize_context_t *c) const

    53   {

    54     TRACE_SANITIZE (this);

    55     return_trace (c->check_struct (this) && likely (version.major == 1));

    56   }

    57 

    58   public:

    59   FixedVersion  version;                /* 0x00010000u for version 1.0. */

    60   FWORD         ascender;               /* Typographic ascent. */

    61   FWORD         descender;              /* Typographic descent. */

    62   FWORD         lineGap;                /* Typographic line gap. */

    63   UFWORD        advanceMax;             /* Maximum advance width/height value in

    64                                          * metrics table. */

    65   FWORD         minLeadingBearing;      /* Minimum left/top sidebearing value in

    66                                          * metrics table. */

    67   FWORD         minTrailingBearing;     /* Minimum right/bottom sidebearing value;

    68                                          * calculated as Min(aw - lsb -

    69                                          * (xMax - xMin)) for horizontal. */

    70   FWORD         maxExtent;              /* horizontal: Max(lsb + (xMax - xMin)),

    71                                          * vertical: minLeadingBearing+(yMax-yMin). */

    72   SHORT         caretSlopeRise;         /* Used to calculate the slope of the

    73                                          * cursor (rise/run); 1 for vertical caret,

    74                                          * 0 for horizontal.*/

    75   SHORT         caretSlopeRun;          /* 0 for vertical caret, 1 for horizontal. */

    76   SHORT         caretOffset;            /* The amount by which a slanted

    77                                          * highlight on a glyph needs

    78                                          * to be shifted to produce the

    79                                          * best appearance. Set to 0 for

    80                                          * non-slanted fonts. */

    81   SHORT         reserved1;              /* Set to 0. */

    82   SHORT         reserved2;              /* Set to 0. */

    83   SHORT         reserved3;              /* Set to 0. */

    84   SHORT         reserved4;              /* Set to 0. */

    85   SHORT         metricDataFormat;       /* 0 for current format. */

    86   USHORT        numberOfLongMetrics;    /* Number of LongMetric entries in metric

    87                                          * table. */

    88   public:

    89   DEFINE_SIZE_STATIC (36);

    90 };

    91 

    92 struct hhea : _hea {

    93   static const hb_tag_t tableTag        = HB_OT_TAG_hhea;

    94 };

    95 struct vhea : _hea {

    96   static const hb_tag_t tableTag        = HB_OT_TAG_vhea;

    97 };

    98 

    99 

   100 } /* namespace OT */

   101 

   102 

   103 #endif /* HB_OT_HHEA_TABLE_HH */