626 lines
18 KiB
C++
626 lines
18 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_HH
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#define HB_FONT_HH
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#include "hb.hh"
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#include "hb-face.hh"
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#include "hb-shaper.hh"
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/*
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* hb_font_funcs_t
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*/
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#define HB_FONT_FUNCS_IMPLEMENT_CALLBACKS \
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HB_FONT_FUNC_IMPLEMENT (font_h_extents) \
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HB_FONT_FUNC_IMPLEMENT (font_v_extents) \
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HB_FONT_FUNC_IMPLEMENT (nominal_glyph) \
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HB_FONT_FUNC_IMPLEMENT (nominal_glyphs) \
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HB_FONT_FUNC_IMPLEMENT (variation_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_advances) \
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HB_FONT_FUNC_IMPLEMENT (glyph_v_advances) \
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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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HB_FONT_FUNC_IMPLEMENT (glyph_name) \
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HB_FONT_FUNC_IMPLEMENT (glyph_from_name) \
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/* ^--- Add new callbacks here */
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struct hb_font_funcs_t
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{
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hb_object_header_t header;
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ASSERT_POD ();
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hb_bool_t immutable;
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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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/* Don't access these directly. Call font->get_*() instead. */
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union get_t {
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struct get_funcs_t {
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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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} f;
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void (*array[0
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#define HB_FONT_FUNC_IMPLEMENT(name) +1
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HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
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#undef HB_FONT_FUNC_IMPLEMENT
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]) (void);
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} get;
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};
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DECLARE_NULL_INSTANCE (hb_font_funcs_t);
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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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{
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hb_object_header_t header;
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ASSERT_POD ();
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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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float ptem;
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/* Font variation coordinates. */
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unsigned int num_coords;
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int *coords;
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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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struct hb_shaper_data_t shaper_data;
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/* Convert from font-space to user-space */
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inline int dir_scale (hb_direction_t direction)
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{ return HB_DIRECTION_IS_VERTICAL(direction) ? y_scale : x_scale; }
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inline hb_position_t em_scale_x (int16_t v) { return em_scale (v, x_scale); }
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inline hb_position_t em_scale_y (int16_t v) { return em_scale (v, y_scale); }
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inline hb_position_t em_scalef_x (float v) { return em_scalef (v, this->x_scale); }
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inline hb_position_t em_scalef_y (float v) { return em_scalef (v, this->y_scale); }
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inline float em_fscale_x (int16_t v) { return em_fscale (v, x_scale); }
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inline float em_fscale_y (int16_t v) { return em_fscale (v, y_scale); }
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inline hb_position_t em_scale_dir (int16_t v, hb_direction_t direction)
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{ return em_scale (v, dir_scale (direction)); }
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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 (hb_position_t) (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 (hb_position_t) (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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/* Public getters */
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HB_INTERNAL bool has_func (unsigned int i);
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HB_INTERNAL bool has_func_set (unsigned int i);
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/* has_* ... */
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#define HB_FONT_FUNC_IMPLEMENT(name) \
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bool \
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has_##name##_func (void) \
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{ \
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hb_font_funcs_t *funcs = this->klass; \
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unsigned int i = offsetof (hb_font_funcs_t::get_t::get_funcs_t, name) / sizeof (funcs->get.array[0]); \
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return has_func (i); \
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} \
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bool \
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has_##name##_func_set (void) \
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{ \
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hb_font_funcs_t *funcs = this->klass; \
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unsigned int i = offsetof (hb_font_funcs_t::get_t::get_funcs_t, name) / sizeof (funcs->get.array[0]); \
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return has_func_set (i); \
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}
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HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
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#undef HB_FONT_FUNC_IMPLEMENT
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inline hb_bool_t get_font_h_extents (hb_font_extents_t *extents)
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{
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memset (extents, 0, sizeof (*extents));
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return klass->get.f.font_h_extents (this, user_data,
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extents,
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klass->user_data.font_h_extents);
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}
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inline hb_bool_t get_font_v_extents (hb_font_extents_t *extents)
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{
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memset (extents, 0, sizeof (*extents));
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return klass->get.f.font_v_extents (this, user_data,
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extents,
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klass->user_data.font_v_extents);
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}
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inline bool has_glyph (hb_codepoint_t unicode)
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{
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hb_codepoint_t glyph;
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return get_nominal_glyph (unicode, &glyph);
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}
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inline hb_bool_t get_nominal_glyph (hb_codepoint_t unicode,
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hb_codepoint_t *glyph)
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{
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*glyph = 0;
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return klass->get.f.nominal_glyph (this, user_data,
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unicode, glyph,
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klass->user_data.nominal_glyph);
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}
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inline unsigned int get_nominal_glyphs (unsigned int count,
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const hb_codepoint_t *first_unicode,
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unsigned int unicode_stride,
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hb_codepoint_t *first_glyph,
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unsigned int glyph_stride)
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{
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return klass->get.f.nominal_glyphs (this, user_data,
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count,
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first_unicode, unicode_stride,
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first_glyph, glyph_stride,
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klass->user_data.nominal_glyphs);
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}
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inline hb_bool_t get_variation_glyph (hb_codepoint_t unicode, hb_codepoint_t variation_selector,
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hb_codepoint_t *glyph)
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{
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*glyph = 0;
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return klass->get.f.variation_glyph (this, user_data,
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unicode, variation_selector, glyph,
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klass->user_data.variation_glyph);
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}
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inline hb_position_t get_glyph_h_advance (hb_codepoint_t glyph)
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{
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return klass->get.f.glyph_h_advance (this, user_data,
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glyph,
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klass->user_data.glyph_h_advance);
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}
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inline hb_position_t get_glyph_v_advance (hb_codepoint_t glyph)
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{
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return klass->get.f.glyph_v_advance (this, user_data,
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glyph,
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klass->user_data.glyph_v_advance);
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}
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inline void get_glyph_h_advances (unsigned int count,
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const hb_codepoint_t *first_glyph,
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unsigned int glyph_stride,
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hb_position_t *first_advance,
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unsigned int advance_stride)
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{
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return klass->get.f.glyph_h_advances (this, user_data,
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count,
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first_glyph, glyph_stride,
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first_advance, advance_stride,
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klass->user_data.glyph_h_advances);
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}
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inline void get_glyph_v_advances (unsigned int count,
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const hb_codepoint_t *first_glyph,
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unsigned int glyph_stride,
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hb_position_t *first_advance,
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unsigned int advance_stride)
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{
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return klass->get.f.glyph_v_advances (this, user_data,
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count,
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first_glyph, glyph_stride,
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first_advance, advance_stride,
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klass->user_data.glyph_v_advances);
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}
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inline hb_bool_t get_glyph_h_origin (hb_codepoint_t glyph,
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hb_position_t *x, hb_position_t *y)
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{
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*x = *y = 0;
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return klass->get.f.glyph_h_origin (this, user_data,
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glyph, x, y,
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klass->user_data.glyph_h_origin);
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}
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inline hb_bool_t get_glyph_v_origin (hb_codepoint_t glyph,
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hb_position_t *x, hb_position_t *y)
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{
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*x = *y = 0;
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return klass->get.f.glyph_v_origin (this, user_data,
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glyph, x, y,
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klass->user_data.glyph_v_origin);
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}
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inline hb_position_t get_glyph_h_kerning (hb_codepoint_t left_glyph, hb_codepoint_t right_glyph)
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{
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return klass->get.f.glyph_h_kerning (this, user_data,
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left_glyph, right_glyph,
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klass->user_data.glyph_h_kerning);
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}
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inline hb_position_t get_glyph_v_kerning (hb_codepoint_t top_glyph, hb_codepoint_t bottom_glyph)
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{
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return klass->get.f.glyph_v_kerning (this, user_data,
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top_glyph, bottom_glyph,
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klass->user_data.glyph_v_kerning);
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}
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inline hb_bool_t get_glyph_extents (hb_codepoint_t glyph,
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hb_glyph_extents_t *extents)
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{
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memset (extents, 0, sizeof (*extents));
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return klass->get.f.glyph_extents (this, user_data,
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glyph,
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extents,
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klass->user_data.glyph_extents);
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}
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inline hb_bool_t get_glyph_contour_point (hb_codepoint_t glyph, unsigned int point_index,
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hb_position_t *x, hb_position_t *y)
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{
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*x = *y = 0;
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return klass->get.f.glyph_contour_point (this, user_data,
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glyph, point_index,
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x, y,
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klass->user_data.glyph_contour_point);
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}
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inline hb_bool_t get_glyph_name (hb_codepoint_t glyph,
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char *name, unsigned int size)
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{
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if (size) *name = '\0';
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return klass->get.f.glyph_name (this, user_data,
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glyph,
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name, size,
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klass->user_data.glyph_name);
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}
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inline hb_bool_t get_glyph_from_name (const char *name, int len, /* -1 means nul-terminated */
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hb_codepoint_t *glyph)
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{
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*glyph = 0;
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if (len == -1) len = strlen (name);
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return klass->get.f.glyph_from_name (this, user_data,
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name, len,
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glyph,
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klass->user_data.glyph_from_name);
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}
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/* A bit higher-level, and with fallback */
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inline void get_h_extents_with_fallback (hb_font_extents_t *extents)
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{
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if (!get_font_h_extents (extents))
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{
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extents->ascender = y_scale * .8;
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extents->descender = extents->ascender - y_scale;
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extents->line_gap = 0;
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}
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}
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inline void get_v_extents_with_fallback (hb_font_extents_t *extents)
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{
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if (!get_font_v_extents (extents))
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{
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extents->ascender = x_scale / 2;
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extents->descender = extents->ascender - x_scale;
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extents->line_gap = 0;
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}
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}
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inline void get_extents_for_direction (hb_direction_t direction,
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hb_font_extents_t *extents)
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{
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if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
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get_h_extents_with_fallback (extents);
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else
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get_v_extents_with_fallback (extents);
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}
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inline void get_glyph_advance_for_direction (hb_codepoint_t glyph,
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hb_direction_t direction,
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hb_position_t *x, hb_position_t *y)
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{
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*x = *y = 0;
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if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
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*x = get_glyph_h_advance (glyph);
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else
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*y = get_glyph_v_advance (glyph);
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}
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inline void get_glyph_advances_for_direction (hb_direction_t direction,
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unsigned int count,
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const hb_codepoint_t *first_glyph,
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unsigned glyph_stride,
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hb_position_t *first_advance,
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unsigned advance_stride)
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{
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if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
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get_glyph_h_advances (count, first_glyph, glyph_stride, first_advance, advance_stride);
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else
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get_glyph_v_advances (count, first_glyph, glyph_stride, first_advance, advance_stride);
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}
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inline void guess_v_origin_minus_h_origin (hb_codepoint_t glyph,
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hb_position_t *x, hb_position_t *y)
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{
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*x = get_glyph_h_advance (glyph) / 2;
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/* TODO cache this somehow?! */
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hb_font_extents_t extents;
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get_h_extents_with_fallback (&extents);
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*y = extents.ascender;
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}
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inline void get_glyph_h_origin_with_fallback (hb_codepoint_t glyph,
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hb_position_t *x, hb_position_t *y)
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{
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if (!get_glyph_h_origin (glyph, x, y) &&
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get_glyph_v_origin (glyph, x, y))
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{
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hb_position_t dx, dy;
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guess_v_origin_minus_h_origin (glyph, &dx, &dy);
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*x -= dx; *y -= dy;
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}
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}
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inline void get_glyph_v_origin_with_fallback (hb_codepoint_t glyph,
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hb_position_t *x, hb_position_t *y)
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{
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if (!get_glyph_v_origin (glyph, x, y) &&
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get_glyph_h_origin (glyph, x, y))
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{
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hb_position_t dx, dy;
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guess_v_origin_minus_h_origin (glyph, &dx, &dy);
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*x += dx; *y += dy;
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}
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}
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inline void get_glyph_origin_for_direction (hb_codepoint_t glyph,
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hb_direction_t direction,
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hb_position_t *x, hb_position_t *y)
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{
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if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
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get_glyph_h_origin_with_fallback (glyph, x, y);
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else
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get_glyph_v_origin_with_fallback (glyph, x, y);
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}
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inline void add_glyph_h_origin (hb_codepoint_t glyph,
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hb_position_t *x, hb_position_t *y)
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{
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hb_position_t origin_x, origin_y;
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get_glyph_h_origin_with_fallback (glyph, &origin_x, &origin_y);
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*x += origin_x;
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*y += origin_y;
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}
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inline void add_glyph_v_origin (hb_codepoint_t glyph,
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hb_position_t *x, hb_position_t *y)
|
|
{
|
|
hb_position_t origin_x, origin_y;
|
|
|
|
get_glyph_v_origin_with_fallback (glyph, &origin_x, &origin_y);
|
|
|
|
*x += origin_x;
|
|
*y += origin_y;
|
|
}
|
|
inline void add_glyph_origin_for_direction (hb_codepoint_t glyph,
|
|
hb_direction_t direction,
|
|
hb_position_t *x, hb_position_t *y)
|
|
{
|
|
hb_position_t origin_x, origin_y;
|
|
|
|
get_glyph_origin_for_direction (glyph, direction, &origin_x, &origin_y);
|
|
|
|
*x += origin_x;
|
|
*y += origin_y;
|
|
}
|
|
|
|
inline void subtract_glyph_h_origin (hb_codepoint_t glyph,
|
|
hb_position_t *x, hb_position_t *y)
|
|
{
|
|
hb_position_t origin_x, origin_y;
|
|
|
|
get_glyph_h_origin_with_fallback (glyph, &origin_x, &origin_y);
|
|
|
|
*x -= origin_x;
|
|
*y -= origin_y;
|
|
}
|
|
inline void subtract_glyph_v_origin (hb_codepoint_t glyph,
|
|
hb_position_t *x, hb_position_t *y)
|
|
{
|
|
hb_position_t origin_x, origin_y;
|
|
|
|
get_glyph_v_origin_with_fallback (glyph, &origin_x, &origin_y);
|
|
|
|
*x -= origin_x;
|
|
*y -= origin_y;
|
|
}
|
|
inline void subtract_glyph_origin_for_direction (hb_codepoint_t glyph,
|
|
hb_direction_t direction,
|
|
hb_position_t *x, hb_position_t *y)
|
|
{
|
|
hb_position_t origin_x, origin_y;
|
|
|
|
get_glyph_origin_for_direction (glyph, direction, &origin_x, &origin_y);
|
|
|
|
*x -= origin_x;
|
|
*y -= origin_y;
|
|
}
|
|
|
|
inline void get_glyph_kerning_for_direction (hb_codepoint_t first_glyph, hb_codepoint_t second_glyph,
|
|
hb_direction_t direction,
|
|
hb_position_t *x, hb_position_t *y)
|
|
{
|
|
if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) {
|
|
*y = 0;
|
|
*x = get_glyph_h_kerning (first_glyph, second_glyph);
|
|
} else {
|
|
*x = 0;
|
|
*y = get_glyph_v_kerning (first_glyph, second_glyph);
|
|
}
|
|
}
|
|
|
|
inline hb_bool_t get_glyph_extents_for_origin (hb_codepoint_t glyph,
|
|
hb_direction_t direction,
|
|
hb_glyph_extents_t *extents)
|
|
{
|
|
hb_bool_t ret = get_glyph_extents (glyph, extents);
|
|
|
|
if (ret)
|
|
subtract_glyph_origin_for_direction (glyph, direction, &extents->x_bearing, &extents->y_bearing);
|
|
|
|
return ret;
|
|
}
|
|
|
|
inline hb_bool_t get_glyph_contour_point_for_origin (hb_codepoint_t glyph, unsigned int point_index,
|
|
hb_direction_t direction,
|
|
hb_position_t *x, hb_position_t *y)
|
|
{
|
|
hb_bool_t ret = get_glyph_contour_point (glyph, point_index, x, y);
|
|
|
|
if (ret)
|
|
subtract_glyph_origin_for_direction (glyph, direction, x, y);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Generates gidDDD if glyph has no name. */
|
|
inline void
|
|
glyph_to_string (hb_codepoint_t glyph,
|
|
char *s, unsigned int size)
|
|
{
|
|
if (get_glyph_name (glyph, s, size)) return;
|
|
|
|
if (size && snprintf (s, size, "gid%u", glyph) < 0)
|
|
*s = '\0';
|
|
}
|
|
|
|
/* Parses gidDDD and uniUUUU strings automatically. */
|
|
inline hb_bool_t
|
|
glyph_from_string (const char *s, int len, /* -1 means nul-terminated */
|
|
hb_codepoint_t *glyph)
|
|
{
|
|
if (get_glyph_from_name (s, len, glyph)) return true;
|
|
|
|
if (len == -1) len = strlen (s);
|
|
|
|
/* Straight glyph index. */
|
|
if (hb_codepoint_parse (s, len, 10, glyph))
|
|
return true;
|
|
|
|
if (len > 3)
|
|
{
|
|
/* gidDDD syntax for glyph indices. */
|
|
if (0 == strncmp (s, "gid", 3) &&
|
|
hb_codepoint_parse (s + 3, len - 3, 10, glyph))
|
|
return true;
|
|
|
|
/* uniUUUU and other Unicode character indices. */
|
|
hb_codepoint_t unichar;
|
|
if (0 == strncmp (s, "uni", 3) &&
|
|
hb_codepoint_parse (s + 3, len - 3, 16, &unichar) &&
|
|
get_nominal_glyph (unichar, glyph))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
inline hb_position_t em_scale (int16_t v, int scale)
|
|
{
|
|
int upem = face->get_upem ();
|
|
int64_t scaled = v * (int64_t) scale;
|
|
scaled += scaled >= 0 ? upem/2 : -upem/2; /* Round. */
|
|
return (hb_position_t) (scaled / upem);
|
|
}
|
|
inline hb_position_t em_scalef (float v, int scale)
|
|
{
|
|
return (hb_position_t) round (v * scale / face->get_upem ());
|
|
}
|
|
inline float em_fscale (int16_t v, int scale)
|
|
{
|
|
return (float) v * scale / face->get_upem ();
|
|
}
|
|
};
|
|
DECLARE_NULL_INSTANCE (hb_font_t);
|
|
|
|
#define HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
|
|
#define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_PROTOTYPE(shaper, font);
|
|
#include "hb-shaper-list.hh"
|
|
#undef HB_SHAPER_IMPLEMENT
|
|
#undef HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
|
|
|
|
|
|
#endif /* HB_FONT_HH */
|