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