2 * Copyright © 2011 Google, Inc.
4 * This is part of HarfBuzz, a text shaping library.
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.
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
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.
24 * Google Author(s): Behdad Esfahbod
27 #define HB_SHAPER fallback
28 #include "hb-shaper-impl-private.hh"
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
)
40 return (hb_fallback_shaper_face_data_t
*) HB_SHAPER_DATA_SUCCEEDED
;
44 _hb_fallback_shaper_face_data_destroy (hb_fallback_shaper_face_data_t
*data HB_UNUSED
)
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
)
58 return (hb_fallback_shaper_font_data_t
*) HB_SHAPER_DATA_SUCCEEDED
;
62 _hb_fallback_shaper_font_data_destroy (hb_fallback_shaper_font_data_t
*data HB_UNUSED
)
68 * shaper shape_plan data
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
)
78 return (hb_fallback_shaper_shape_plan_data_t
*) HB_SHAPER_DATA_SUCCEEDED
;
82 _hb_fallback_shaper_shape_plan_data_destroy (hb_fallback_shaper_shape_plan_data_t
*data HB_UNUSED
)
92 _hb_fallback_shape (hb_shape_plan_t
*shape_plan HB_UNUSED
,
95 const hb_feature_t
*features HB_UNUSED
,
96 unsigned int num_features HB_UNUSED
)
100 * - Apply fallback kern.
101 * - Handle Variation Selectors?
102 * - Apply normalization?
104 * This will make the fallback shaper into a dumb "TrueType"
105 * shaper which many people unfortunately still request.
108 hb_codepoint_t space
;
109 bool has_space
= font
->get_glyph (' ', 0, &space
);
111 buffer
->clear_positions ();
113 hb_direction_t direction
= buffer
->props
.direction
;
114 hb_unicode_funcs_t
*unicode
= buffer
->unicode
;
115 unsigned int count
= buffer
->len
;
116 hb_glyph_info_t
*info
= buffer
->info
;
117 hb_glyph_position_t
*pos
= buffer
->pos
;
118 for (unsigned int i
= 0; i
< count
; i
++)
120 if (has_space
&& unicode
->is_default_ignorable (info
[i
].codepoint
)) {
121 info
[i
].codepoint
= space
;
122 pos
[i
].x_advance
= 0;
123 pos
[i
].y_advance
= 0;
126 font
->get_glyph (info
[i
].codepoint
, 0, &info
[i
].codepoint
);
127 font
->get_glyph_advance_for_direction (info
[i
].codepoint
,
131 font
->subtract_glyph_origin_for_direction (info
[i
].codepoint
,
137 if (HB_DIRECTION_IS_BACKWARD (direction
))
138 hb_buffer_reverse (buffer
);