The Tor Browser: gfx/harfbuzz/src/hb-fallback-shape.cc@925c144e1f1f

     1 /*

     2  * Copyright © 2011  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  */

    27 #define HB_SHAPER fallback

    28 #include "hb-shaper-impl-private.hh"

    31 /*

    32  * shaper face data

    33  */

    35 struct hb_fallback_shaper_face_data_t {};

    37 hb_fallback_shaper_face_data_t *

    38 _hb_fallback_shaper_face_data_create (hb_face_t *face HB_UNUSED)

    39 {

    40   return (hb_fallback_shaper_face_data_t *) HB_SHAPER_DATA_SUCCEEDED;

    41 }

    43 void

    44 _hb_fallback_shaper_face_data_destroy (hb_fallback_shaper_face_data_t *data HB_UNUSED)

    45 {

    46 }

    49 /*

    50  * shaper font data

    51  */

    53 struct hb_fallback_shaper_font_data_t {};

    55 hb_fallback_shaper_font_data_t *

    56 _hb_fallback_shaper_font_data_create (hb_font_t *font HB_UNUSED)

    57 {

    58   return (hb_fallback_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;

    59 }

    61 void

    62 _hb_fallback_shaper_font_data_destroy (hb_fallback_shaper_font_data_t *data HB_UNUSED)

    63 {

    64 }

    67 /*

    68  * shaper shape_plan data

    69  */

    71 struct hb_fallback_shaper_shape_plan_data_t {};

    73 hb_fallback_shaper_shape_plan_data_t *

    74 _hb_fallback_shaper_shape_plan_data_create (hb_shape_plan_t    *shape_plan HB_UNUSED,

    75 					    const hb_feature_t *user_features HB_UNUSED,

    76 					    unsigned int        num_user_features HB_UNUSED)

    77 {

    78   return (hb_fallback_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED;

    79 }

    81 void

    82 _hb_fallback_shaper_shape_plan_data_destroy (hb_fallback_shaper_shape_plan_data_t *data HB_UNUSED)

    83 {

    84 }

    87 /*

    88  * shaper

    89  */

    91 hb_bool_t

    92 _hb_fallback_shape (hb_shape_plan_t    *shape_plan HB_UNUSED,

    93 		    hb_font_t          *font,

    94 		    hb_buffer_t        *buffer,

    95 		    const hb_feature_t *features HB_UNUSED,

    96 		    unsigned int        num_features HB_UNUSED)

    97 {

    98   /* TODO

    99    *

   100    * - Apply fallback kern.

   101    * - Handle Variation Selectors?

   102    * - Apply normalization?

   103    *

   104    * This will make the fallback shaper into a dumb "TrueType"

   105    * shaper which many people unfortunately still request.

   106    */

   108   bool has_space;

   109   hb_codepoint_t space;

   110   has_space = font->get_glyph (' ', 0, &space);

   112   buffer->clear_positions ();

   114   unsigned int count = buffer->len;

   116   for (unsigned int i = 0; i < count; i++)

   117   {

   118     if (has_space && buffer->unicode->is_default_ignorable (buffer->info[i].codepoint)) {

   119       buffer->info[i].codepoint = space;

   120       buffer->pos[i].x_advance = 0;

   121       buffer->pos[i].y_advance = 0;

   122       continue;

   123     }

   124     font->get_glyph (buffer->info[i].codepoint, 0, &buffer->info[i].codepoint);

   125     font->get_glyph_advance_for_direction (buffer->info[i].codepoint,

   126 					   buffer->props.direction,

   127 					   &buffer->pos[i].x_advance,

   128 					   &buffer->pos[i].y_advance);

   129     font->subtract_glyph_origin_for_direction (buffer->info[i].codepoint,

   130 					       buffer->props.direction,

   131 					       &buffer->pos[i].x_offset,

   132 					       &buffer->pos[i].y_offset);

   133   }

   135   if (HB_DIRECTION_IS_BACKWARD (buffer->props.direction))

   136     hb_buffer_reverse (buffer);

   138   return true;

   139 }

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