/* * Copyright © 2009 Red Hat, Inc. * 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. * * Red Hat Author(s): Behdad Esfahbod * Google Author(s): Behdad Esfahbod */ #ifndef HB_FONT_PRIVATE_HH #define HB_FONT_PRIVATE_HH #include "hb-private.hh" #include "hb-object-private.hh" #include "hb-face-private.hh" #include "hb-shaper-private.hh" /* * hb_font_funcs_t */ #define HB_FONT_FUNCS_IMPLEMENT_CALLBACKS \ HB_FONT_FUNC_IMPLEMENT (font_h_extents) \ HB_FONT_FUNC_IMPLEMENT (font_v_extents) \ HB_FONT_FUNC_IMPLEMENT (nominal_glyph) \ HB_FONT_FUNC_IMPLEMENT (variation_glyph) \ HB_FONT_FUNC_IMPLEMENT (glyph_h_advance) \ HB_FONT_FUNC_IMPLEMENT (glyph_v_advance) \ HB_FONT_FUNC_IMPLEMENT (glyph_h_origin) \ HB_FONT_FUNC_IMPLEMENT (glyph_v_origin) \ HB_FONT_FUNC_IMPLEMENT (glyph_h_kerning) \ HB_FONT_FUNC_IMPLEMENT (glyph_v_kerning) \ HB_FONT_FUNC_IMPLEMENT (glyph_extents) \ HB_FONT_FUNC_IMPLEMENT (glyph_contour_point) \ HB_FONT_FUNC_IMPLEMENT (glyph_name) \ HB_FONT_FUNC_IMPLEMENT (glyph_from_name) \ /* ^--- Add new callbacks here */ struct hb_font_funcs_t { hb_object_header_t header; ASSERT_POD (); hb_bool_t immutable; struct { #define HB_FONT_FUNC_IMPLEMENT(name) void *name; HB_FONT_FUNCS_IMPLEMENT_CALLBACKS #undef HB_FONT_FUNC_IMPLEMENT } user_data; struct { #define HB_FONT_FUNC_IMPLEMENT(name) hb_destroy_func_t name; HB_FONT_FUNCS_IMPLEMENT_CALLBACKS #undef HB_FONT_FUNC_IMPLEMENT } destroy; /* Don't access these directly. Call font->get_*() instead. */ union get_t { struct get_funcs_t { #define HB_FONT_FUNC_IMPLEMENT(name) hb_font_get_##name##_func_t name; HB_FONT_FUNCS_IMPLEMENT_CALLBACKS #undef HB_FONT_FUNC_IMPLEMENT } f; void (*array[VAR]) (void); } get; }; /* * hb_font_t */ struct hb_font_t { hb_object_header_t header; ASSERT_POD (); hb_bool_t immutable; hb_font_t *parent; hb_face_t *face; int x_scale; int y_scale; unsigned int x_ppem; unsigned int y_ppem; hb_font_funcs_t *klass; void *user_data; hb_destroy_func_t destroy; struct hb_shaper_data_t shaper_data; /* Convert from font-space to user-space */ inline hb_position_t em_scale_x (int16_t v) { return em_scale (v, this->x_scale); } inline hb_position_t em_scale_y (int16_t v) { return em_scale (v, this->y_scale); } /* Convert from parent-font user-space to our user-space */ inline hb_position_t parent_scale_x_distance (hb_position_t v) { if (unlikely (parent && parent->x_scale != x_scale)) return (hb_position_t) (v * (int64_t) this->x_scale / this->parent->x_scale); return v; } inline hb_position_t parent_scale_y_distance (hb_position_t v) { if (unlikely (parent && parent->y_scale != y_scale)) return (hb_position_t) (v * (int64_t) this->y_scale / this->parent->y_scale); return v; } inline hb_position_t parent_scale_x_position (hb_position_t v) { return parent_scale_x_distance (v); } inline hb_position_t parent_scale_y_position (hb_position_t v) { return parent_scale_y_distance (v); } inline void parent_scale_distance (hb_position_t *x, hb_position_t *y) { *x = parent_scale_x_distance (*x); *y = parent_scale_y_distance (*y); } inline void parent_scale_position (hb_position_t *x, hb_position_t *y) { *x = parent_scale_x_position (*x); *y = parent_scale_y_position (*y); } /* Public getters */ HB_INTERNAL bool has_func (unsigned int i); /* has_* ... */ #define HB_FONT_FUNC_IMPLEMENT(name) \ bool \ has_##name##_func (void) \ { \ hb_font_funcs_t *funcs = this->klass; \ unsigned int i = offsetof (hb_font_funcs_t::get_t::get_funcs_t, name) / sizeof (funcs->get.array[0]); \ return has_func (i); \ } HB_FONT_FUNCS_IMPLEMENT_CALLBACKS #undef HB_FONT_FUNC_IMPLEMENT inline hb_bool_t get_font_h_extents (hb_font_extents_t *extents) { memset (extents, 0, sizeof (*extents)); return klass->get.f.font_h_extents (this, user_data, extents, klass->user_data.font_h_extents); } inline hb_bool_t get_font_v_extents (hb_font_extents_t *extents) { memset (extents, 0, sizeof (*extents)); return klass->get.f.font_v_extents (this, user_data, extents, klass->user_data.font_v_extents); } inline bool has_glyph (hb_codepoint_t unicode) { hb_codepoint_t glyph; return get_nominal_glyph (unicode, &glyph); } inline hb_bool_t get_nominal_glyph (hb_codepoint_t unicode, hb_codepoint_t *glyph) { *glyph = 0; return klass->get.f.nominal_glyph (this, user_data, unicode, glyph, klass->user_data.nominal_glyph); } inline hb_bool_t get_variation_glyph (hb_codepoint_t unicode, hb_codepoint_t variation_selector, hb_codepoint_t *glyph) { *glyph = 0; return klass->get.f.variation_glyph (this, user_data, unicode, variation_selector, glyph, klass->user_data.variation_glyph); } inline hb_position_t get_glyph_h_advance (hb_codepoint_t glyph) { return klass->get.f.glyph_h_advance (this, user_data, glyph, klass->user_data.glyph_h_advance); } inline hb_position_t get_glyph_v_advance (hb_codepoint_t glyph) { return klass->get.f.glyph_v_advance (this, user_data, glyph, klass->user_data.glyph_v_advance); } inline hb_bool_t get_glyph_h_origin (hb_codepoint_t glyph, hb_position_t *x, hb_position_t *y) { *x = *y = 0; return klass->get.f.glyph_h_origin (this, user_data, glyph, x, y, klass->user_data.glyph_h_origin); } inline hb_bool_t get_glyph_v_origin (hb_codepoint_t glyph, hb_position_t *x, hb_position_t *y) { *x = *y = 0; return klass->get.f.glyph_v_origin (this, user_data, glyph, x, y, klass->user_data.glyph_v_origin); } inline hb_position_t get_glyph_h_kerning (hb_codepoint_t left_glyph, hb_codepoint_t right_glyph) { return klass->get.f.glyph_h_kerning (this, user_data, left_glyph, right_glyph, klass->user_data.glyph_h_kerning); } inline hb_position_t get_glyph_v_kerning (hb_codepoint_t top_glyph, hb_codepoint_t bottom_glyph) { return klass->get.f.glyph_v_kerning (this, user_data, top_glyph, bottom_glyph, klass->user_data.glyph_v_kerning); } inline hb_bool_t get_glyph_extents (hb_codepoint_t glyph, hb_glyph_extents_t *extents) { memset (extents, 0, sizeof (*extents)); return klass->get.f.glyph_extents (this, user_data, glyph, extents, klass->user_data.glyph_extents); } inline hb_bool_t get_glyph_contour_point (hb_codepoint_t glyph, unsigned int point_index, hb_position_t *x, hb_position_t *y) { *x = *y = 0; return klass->get.f.glyph_contour_point (this, user_data, glyph, point_index, x, y, klass->user_data.glyph_contour_point); } inline hb_bool_t get_glyph_name (hb_codepoint_t glyph, char *name, unsigned int size) { if (size) *name = '\0'; return klass->get.f.glyph_name (this, user_data, glyph, name, size, klass->user_data.glyph_name); } inline hb_bool_t get_glyph_from_name (const char *name, int len, /* -1 means nul-terminated */ hb_codepoint_t *glyph) { *glyph = 0; if (len == -1) len = strlen (name); return klass->get.f.glyph_from_name (this, user_data, name, len, glyph, klass->user_data.glyph_from_name); } /* A bit higher-level, and with fallback */ inline void get_extents_for_direction (hb_direction_t direction, hb_font_extents_t *extents) { if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) { if (!get_font_h_extents (extents)) { extents->ascender = y_scale * .8; extents->descender = y_scale - extents->ascender; extents->line_gap = 0; } } else { if (!get_font_v_extents (extents)) { extents->ascender = x_scale / 2; extents->descender = x_scale - extents->ascender; extents->line_gap = 0; } } } inline void get_glyph_advance_for_direction (hb_codepoint_t glyph, hb_direction_t direction, hb_position_t *x, hb_position_t *y) { if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) { *x = get_glyph_h_advance (glyph); *y = 0; } else { *x = 0; *y = get_glyph_v_advance (glyph); } } /* Internal only */ inline void guess_v_origin_minus_h_origin (hb_codepoint_t glyph, hb_position_t *x, hb_position_t *y) { *x = get_glyph_h_advance (glyph) / 2; /* TODO use font_extents.ascender */ *y = y_scale; } inline void get_glyph_origin_for_direction (hb_codepoint_t glyph, hb_direction_t direction, hb_position_t *x, hb_position_t *y) { if (likely (HB_DIRECTION_IS_HORIZONTAL (direction))) { if (!get_glyph_h_origin (glyph, x, y) && get_glyph_v_origin (glyph, x, y)) { hb_position_t dx, dy; guess_v_origin_minus_h_origin (glyph, &dx, &dy); *x -= dx; *y -= dy; } } else { if (!get_glyph_v_origin (glyph, x, y) && get_glyph_h_origin (glyph, x, y)) { hb_position_t dx, dy; guess_v_origin_minus_h_origin (glyph, &dx, &dy); *x += dx; *y += dy; } } } inline void add_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 (glyph, &origin_x, &origin_y); *x += origin_x; *y += origin_y; } inline void add_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 (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 (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 (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))) { *x = get_glyph_h_kerning (first_glyph, second_glyph); *y = 0; } 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; } private: inline hb_position_t em_scale (int16_t v, int scale) { return (hb_position_t) (v * (int64_t) scale / face->get_upem ()); } }; #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_PRIVATE_HH */