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-/*
- * 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;
-
- float ptem;
-
- /* Font variation coordinates. */
- unsigned int num_coords;
- int *coords;
-
- 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 int dir_scale (hb_direction_t direction)
- { return HB_DIRECTION_IS_VERTICAL(direction) ? y_scale : x_scale; }
- inline hb_position_t em_scale_x (int16_t v) { return em_scale (v, x_scale); }
- inline hb_position_t em_scale_y (int16_t v) { return em_scale (v, y_scale); }
- inline hb_position_t em_scalef_x (float v) { return em_scalef (v, this->x_scale); }
- inline hb_position_t em_scalef_y (float v) { return em_scalef (v, this->y_scale); }
- inline hb_position_t em_scale_dir (int16_t v, hb_direction_t direction)
- { return em_scale (v, dir_scale (direction)); }
-
- /* 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_h_extents_with_fallback (hb_font_extents_t *extents)
- {
- if (!get_font_h_extents (extents))
- {
- extents->ascender = y_scale * .8;
- extents->descender = extents->ascender - y_scale;
- extents->line_gap = 0;
- }
- }
- inline void get_v_extents_with_fallback (hb_font_extents_t *extents)
- {
- if (!get_font_v_extents (extents))
- {
- extents->ascender = x_scale / 2;
- extents->descender = extents->ascender - x_scale;
- extents->line_gap = 0;
- }
- }
-
- inline void get_extents_for_direction (hb_direction_t direction,
- hb_font_extents_t *extents)
- {
- if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
- get_h_extents_with_fallback (extents);
- else
- get_v_extents_with_fallback (extents);
- }
-
- 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);
- }
- }
-
- 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 cache this somehow?! */
- hb_font_extents_t extents;
- get_h_extents_with_fallback (&extents);
- *y = extents.ascender;
- }
-
- inline void get_glyph_h_origin_with_fallback (hb_codepoint_t glyph,
- hb_position_t *x, hb_position_t *y)
- {
- 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;
- }
- }
- inline void get_glyph_v_origin_with_fallback (hb_codepoint_t glyph,
- hb_position_t *x, hb_position_t *y)
- {
- 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 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)))
- get_glyph_h_origin_with_fallback (glyph, x, y);
- else
- get_glyph_v_origin_with_fallback (glyph, x, y);
- }
-
- 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_with_fallback (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_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))) {
- *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;
- }
-
- 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) (v * 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 */
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