165 lines
4.4 KiB
C++
165 lines
4.4 KiB
C++
/*
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* Copyright © 2009 Red Hat, Inc.
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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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* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_FONT_PRIVATE_HH
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#define HB_FONT_PRIVATE_HH
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#include "hb-private.hh"
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#include "hb-font.h"
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#include "hb-object-private.hh"
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HB_BEGIN_DECLS
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/*
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* hb_font_funcs_t
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*/
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struct _hb_font_funcs_t {
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hb_object_header_t header;
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hb_bool_t immutable;
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/* Don't access these directly. Call hb_font_get_*() instead. */
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#define HB_FONT_FUNCS_IMPLEMENT_CALLBACKS \
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HB_FONT_FUNC_IMPLEMENT (glyph) \
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HB_FONT_FUNC_IMPLEMENT (glyph_h_advance) \
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HB_FONT_FUNC_IMPLEMENT (glyph_v_advance) \
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HB_FONT_FUNC_IMPLEMENT (glyph_h_origin) \
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HB_FONT_FUNC_IMPLEMENT (glyph_v_origin) \
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HB_FONT_FUNC_IMPLEMENT (glyph_h_kerning) \
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HB_FONT_FUNC_IMPLEMENT (glyph_v_kerning) \
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HB_FONT_FUNC_IMPLEMENT (glyph_extents) \
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HB_FONT_FUNC_IMPLEMENT (glyph_contour_point)
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struct {
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#define HB_FONT_FUNC_IMPLEMENT(name) hb_font_get_##name##_func_t name;
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HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
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#undef HB_FONT_FUNC_IMPLEMENT
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} get;
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struct {
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#define HB_FONT_FUNC_IMPLEMENT(name) void *name;
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HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
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#undef HB_FONT_FUNC_IMPLEMENT
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} user_data;
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struct {
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#define HB_FONT_FUNC_IMPLEMENT(name) hb_destroy_func_t name;
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HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
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#undef HB_FONT_FUNC_IMPLEMENT
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} destroy;
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};
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/*
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* hb_face_t
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*/
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struct _hb_face_t {
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hb_object_header_t header;
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hb_bool_t immutable;
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hb_get_table_func_t get_table;
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void *user_data;
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hb_destroy_func_t destroy;
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struct hb_ot_layout_t *ot_layout;
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unsigned int upem;
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};
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/*
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* hb_font_t
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*/
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struct _hb_font_t {
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hb_object_header_t header;
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hb_bool_t immutable;
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hb_font_t *parent;
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hb_face_t *face;
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int x_scale;
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int y_scale;
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unsigned int x_ppem;
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unsigned int y_ppem;
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hb_font_funcs_t *klass;
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void *user_data;
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hb_destroy_func_t destroy;
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/* Convert from font-space to user-space */
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inline hb_position_t em_scale_x (int16_t v) { return em_scale (v, this->x_scale); }
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inline hb_position_t em_scale_y (int16_t v) { return em_scale (v, this->y_scale); }
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/* Convert from parent-font user-space to our user-space */
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inline hb_position_t parent_scale_x_distance (hb_position_t v) {
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if (unlikely (parent && parent->x_scale != x_scale))
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return v * (int64_t) this->x_scale / this->parent->x_scale;
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return v;
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}
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inline hb_position_t parent_scale_y_distance (hb_position_t v) {
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if (unlikely (parent && parent->y_scale != y_scale))
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return v * (int64_t) this->y_scale / this->parent->y_scale;
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return v;
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}
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inline hb_position_t parent_scale_x_position (hb_position_t v) {
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return parent_scale_x_distance (v); /* We don't have translation right now */
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}
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inline hb_position_t parent_scale_y_position (hb_position_t v) {
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return parent_scale_y_distance (v); /* We don't have translation right now */
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}
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inline void parent_scale_distance (hb_position_t *x, hb_position_t *y) {
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*x = parent_scale_x_distance (*x);
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*y = parent_scale_y_distance (*y);
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}
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inline void parent_scale_position (hb_position_t *x, hb_position_t *y) {
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*x = parent_scale_x_position (*x);
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*y = parent_scale_y_position (*y);
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}
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private:
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inline hb_position_t em_scale (int16_t v, int scale) { return v * (int64_t) scale / this->face->upem; }
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};
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HB_END_DECLS
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#endif /* HB_FONT_PRIVATE_HH */
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