238 lines
8.0 KiB
C++
238 lines
8.0 KiB
C++
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/*
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* Copyright © 2011,2014 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, Roozbeh Pournader
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*/
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#include "hb.hh"
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#include "hb-ot.h"
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#include "hb-font.hh"
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#include "hb-machinery.hh"
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#include "hb-ot-face.hh"
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#include "hb-ot-cmap-table.hh"
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#include "hb-ot-hmtx-table.hh"
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#include "hb-ot-kern-table.hh"
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#include "hb-ot-post-table.hh"
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#include "hb-ot-glyf-table.hh"
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#include "hb-ot-color-cbdt-table.hh"
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static hb_bool_t
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hb_ot_get_nominal_glyph (hb_font_t *font HB_UNUSED,
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void *font_data,
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hb_codepoint_t unicode,
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hb_codepoint_t *glyph,
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void *user_data HB_UNUSED)
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{
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const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
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return ot_font->cmap.get_relaxed()->get_nominal_glyph (unicode, glyph);
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}
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static hb_bool_t
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hb_ot_get_variation_glyph (hb_font_t *font HB_UNUSED,
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void *font_data,
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hb_codepoint_t unicode,
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hb_codepoint_t variation_selector,
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hb_codepoint_t *glyph,
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void *user_data HB_UNUSED)
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{
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const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
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return ot_font->cmap.get_relaxed ()->get_variation_glyph (unicode, variation_selector, glyph);
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}
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static hb_position_t
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hb_ot_get_glyph_h_advance (hb_font_t *font,
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void *font_data,
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hb_codepoint_t glyph,
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void *user_data HB_UNUSED)
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{
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const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
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return font->em_scale_x (ot_font->hmtx.get_relaxed ()->get_advance (glyph, font));
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}
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static hb_position_t
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hb_ot_get_glyph_v_advance (hb_font_t *font,
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void *font_data,
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hb_codepoint_t glyph,
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void *user_data HB_UNUSED)
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{
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const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
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return font->em_scale_y (-(int) ot_font->vmtx.get_relaxed ()->get_advance (glyph, font));
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}
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static hb_position_t
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hb_ot_get_glyph_h_kerning (hb_font_t *font,
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void *font_data,
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hb_codepoint_t left_glyph,
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hb_codepoint_t right_glyph,
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void *user_data HB_UNUSED)
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{
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const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
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return font->em_scale_x (ot_font->kern->get_h_kerning (left_glyph, right_glyph));
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}
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static hb_bool_t
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hb_ot_get_glyph_extents (hb_font_t *font,
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void *font_data,
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hb_codepoint_t glyph,
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hb_glyph_extents_t *extents,
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void *user_data HB_UNUSED)
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{
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const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
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bool ret = ot_font->glyf->get_extents (glyph, extents);
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if (!ret)
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ret = ot_font->CBDT->get_extents (glyph, extents);
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// TODO Hook up side-bearings variations.
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extents->x_bearing = font->em_scale_x (extents->x_bearing);
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extents->y_bearing = font->em_scale_y (extents->y_bearing);
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extents->width = font->em_scale_x (extents->width);
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extents->height = font->em_scale_y (extents->height);
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return ret;
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}
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static hb_bool_t
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hb_ot_get_glyph_name (hb_font_t *font HB_UNUSED,
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void *font_data,
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hb_codepoint_t glyph,
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char *name, unsigned int size,
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void *user_data HB_UNUSED)
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{
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const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
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return ot_font->post->get_glyph_name (glyph, name, size);
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}
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static hb_bool_t
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hb_ot_get_glyph_from_name (hb_font_t *font HB_UNUSED,
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void *font_data,
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const char *name, int len,
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hb_codepoint_t *glyph,
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void *user_data HB_UNUSED)
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{
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const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
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return ot_font->post->get_glyph_from_name (name, len, glyph);
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}
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static hb_bool_t
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hb_ot_get_font_h_extents (hb_font_t *font,
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void *font_data,
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hb_font_extents_t *metrics,
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void *user_data HB_UNUSED)
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{
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const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
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metrics->ascender = font->em_scale_y (ot_font->hmtx.get_relaxed ()->ascender);
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metrics->descender = font->em_scale_y (ot_font->hmtx.get_relaxed ()->descender);
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metrics->line_gap = font->em_scale_y (ot_font->hmtx.get_relaxed ()->line_gap);
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// TODO Hook up variations.
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return ot_font->hmtx.get_relaxed ()->has_font_extents;
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}
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static hb_bool_t
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hb_ot_get_font_v_extents (hb_font_t *font,
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void *font_data,
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hb_font_extents_t *metrics,
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void *user_data HB_UNUSED)
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{
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const hb_ot_face_data_t *ot_font = (const hb_ot_face_data_t *) font_data;
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metrics->ascender = font->em_scale_x (ot_font->vmtx.get_relaxed ()->ascender);
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metrics->descender = font->em_scale_x (ot_font->vmtx.get_relaxed ()->descender);
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metrics->line_gap = font->em_scale_x (ot_font->vmtx.get_relaxed ()->line_gap);
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// TODO Hook up variations.
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return ot_font->vmtx.get_relaxed ()->has_font_extents;
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}
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#ifdef HB_USE_ATEXIT
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static void free_static_ot_funcs (void);
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#endif
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static struct hb_ot_font_funcs_lazy_loader_t : hb_font_funcs_lazy_loader_t<hb_ot_font_funcs_lazy_loader_t>
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{
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static inline hb_font_funcs_t *create (void)
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{
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hb_font_funcs_t *funcs = hb_font_funcs_create ();
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hb_font_funcs_set_font_h_extents_func (funcs, hb_ot_get_font_h_extents, nullptr, nullptr);
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hb_font_funcs_set_font_v_extents_func (funcs, hb_ot_get_font_v_extents, nullptr, nullptr);
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hb_font_funcs_set_nominal_glyph_func (funcs, hb_ot_get_nominal_glyph, nullptr, nullptr);
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hb_font_funcs_set_variation_glyph_func (funcs, hb_ot_get_variation_glyph, nullptr, nullptr);
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hb_font_funcs_set_glyph_h_advance_func (funcs, hb_ot_get_glyph_h_advance, nullptr, nullptr);
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hb_font_funcs_set_glyph_v_advance_func (funcs, hb_ot_get_glyph_v_advance, nullptr, nullptr);
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//hb_font_funcs_set_glyph_h_origin_func (funcs, hb_ot_get_glyph_h_origin, nullptr, nullptr);
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//hb_font_funcs_set_glyph_v_origin_func (funcs, hb_ot_get_glyph_v_origin, nullptr, nullptr);
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hb_font_funcs_set_glyph_h_kerning_func (funcs, hb_ot_get_glyph_h_kerning, nullptr, nullptr);
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//hb_font_funcs_set_glyph_v_kerning_func (funcs, hb_ot_get_glyph_v_kerning, nullptr, nullptr);
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hb_font_funcs_set_glyph_extents_func (funcs, hb_ot_get_glyph_extents, nullptr, nullptr);
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//hb_font_funcs_set_glyph_contour_point_func (funcs, hb_ot_get_glyph_contour_point, nullptr, nullptr);
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hb_font_funcs_set_glyph_name_func (funcs, hb_ot_get_glyph_name, nullptr, nullptr);
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hb_font_funcs_set_glyph_from_name_func (funcs, hb_ot_get_glyph_from_name, nullptr, nullptr);
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hb_font_funcs_make_immutable (funcs);
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#ifdef HB_USE_ATEXIT
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atexit (free_static_ot_funcs);
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#endif
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return funcs;
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}
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} static_ot_funcs;
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#ifdef HB_USE_ATEXIT
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static
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void free_static_ot_funcs (void)
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{
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static_ot_funcs.free_instance ();
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}
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#endif
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static hb_font_funcs_t *
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_hb_ot_get_font_funcs (void)
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{
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return static_ot_funcs.get_unconst ();
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}
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/**
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* hb_ot_font_set_funcs:
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*
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* Since: 0.9.28
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**/
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void
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hb_ot_font_set_funcs (hb_font_t *font)
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{
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if (unlikely (!hb_ot_shaper_face_data_ensure (font->face))) return;
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hb_ot_face_data_t *ot_font = hb_ot_face_data (font->face);
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/* Load them lazies. We access them with get_relaxed() for performance. */
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ot_font->cmap.get ();
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ot_font->hmtx.get ();
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ot_font->vmtx.get ();
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hb_font_set_funcs (font,
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_hb_ot_get_font_funcs (),
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ot_font,
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nullptr);
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}
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