HarfBuzz text shaping engine
http://harfbuzz.github.io/
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164 lines
4.3 KiB
164 lines
4.3 KiB
/* |
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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); |
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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); |
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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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