author | prr |
Mon, 23 Nov 2015 09:58:44 -0800 | |
changeset 34414 | e496a8d8fc8a |
child 40435 | 553eb1a50733 |
permissions | -rw-r--r-- |
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/* |
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* Copyright © 2011 Google, Inc. |
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* |
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* This is part of HarfBuzz, a text shaping library. |
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* |
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* Permission is hereby granted, without written agreement and without |
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* license or royalty fees, to use, copy, modify, and distribute this |
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* software and its documentation for any purpose, provided that the |
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* above copyright notice and the following two paragraphs appear in |
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* all copies of this software. |
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* |
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
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* DAMAGE. |
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* |
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
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* |
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* Google Author(s): Behdad Esfahbod |
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*/ |
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|
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#define HB_SHAPER fallback |
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#include "hb-shaper-impl-private.hh" |
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|
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/* |
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* shaper face data |
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*/ |
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struct hb_fallback_shaper_face_data_t {}; |
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hb_fallback_shaper_face_data_t * |
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_hb_fallback_shaper_face_data_create (hb_face_t *face HB_UNUSED) |
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{ |
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return (hb_fallback_shaper_face_data_t *) HB_SHAPER_DATA_SUCCEEDED; |
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} |
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void |
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_hb_fallback_shaper_face_data_destroy (hb_fallback_shaper_face_data_t *data HB_UNUSED) |
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{ |
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} |
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/* |
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* shaper font data |
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*/ |
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struct hb_fallback_shaper_font_data_t {}; |
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hb_fallback_shaper_font_data_t * |
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_hb_fallback_shaper_font_data_create (hb_font_t *font HB_UNUSED) |
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{ |
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return (hb_fallback_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED; |
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} |
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void |
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_hb_fallback_shaper_font_data_destroy (hb_fallback_shaper_font_data_t *data HB_UNUSED) |
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{ |
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} |
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/* |
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* shaper shape_plan data |
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*/ |
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struct hb_fallback_shaper_shape_plan_data_t {}; |
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hb_fallback_shaper_shape_plan_data_t * |
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_hb_fallback_shaper_shape_plan_data_create (hb_shape_plan_t *shape_plan HB_UNUSED, |
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const hb_feature_t *user_features HB_UNUSED, |
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unsigned int num_user_features HB_UNUSED) |
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{ |
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return (hb_fallback_shaper_shape_plan_data_t *) HB_SHAPER_DATA_SUCCEEDED; |
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} |
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void |
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_hb_fallback_shaper_shape_plan_data_destroy (hb_fallback_shaper_shape_plan_data_t *data HB_UNUSED) |
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{ |
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} |
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/* |
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* shaper |
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*/ |
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hb_bool_t |
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_hb_fallback_shape (hb_shape_plan_t *shape_plan HB_UNUSED, |
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hb_font_t *font, |
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hb_buffer_t *buffer, |
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const hb_feature_t *features HB_UNUSED, |
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unsigned int num_features HB_UNUSED) |
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{ |
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/* TODO |
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* |
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* - Apply fallback kern. |
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* - Handle Variation Selectors? |
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* - Apply normalization? |
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* |
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* This will make the fallback shaper into a dumb "TrueType" |
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* shaper which many people unfortunately still request. |
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*/ |
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hb_codepoint_t space; |
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bool has_space = font->get_glyph (' ', 0, &space); |
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buffer->clear_positions (); |
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hb_direction_t direction = buffer->props.direction; |
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hb_unicode_funcs_t *unicode = buffer->unicode; |
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unsigned int count = buffer->len; |
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hb_glyph_info_t *info = buffer->info; |
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hb_glyph_position_t *pos = buffer->pos; |
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for (unsigned int i = 0; i < count; i++) |
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{ |
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if (has_space && unicode->is_default_ignorable (info[i].codepoint)) { |
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info[i].codepoint = space; |
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pos[i].x_advance = 0; |
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pos[i].y_advance = 0; |
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continue; |
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125 |
} |
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126 |
font->get_glyph (info[i].codepoint, 0, &info[i].codepoint); |
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font->get_glyph_advance_for_direction (info[i].codepoint, |
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128 |
direction, |
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129 |
&pos[i].x_advance, |
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130 |
&pos[i].y_advance); |
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131 |
font->subtract_glyph_origin_for_direction (info[i].codepoint, |
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132 |
direction, |
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133 |
&pos[i].x_offset, |
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134 |
&pos[i].y_offset); |
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135 |
} |
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136 |
|
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137 |
if (HB_DIRECTION_IS_BACKWARD (direction)) |
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138 |
hb_buffer_reverse (buffer); |
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139 |
|
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140 |
return true; |
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141 |
} |