470 lines
13 KiB
C++
470 lines
13 KiB
C++
/*
|
|
* 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-font.h"
|
|
#include "hb-object-private.hh"
|
|
#include "hb-shaper-private.hh"
|
|
#include "hb-shape-plan-private.hh"
|
|
|
|
|
|
|
|
/*
|
|
* hb_font_funcs_t
|
|
*/
|
|
|
|
#define HB_FONT_FUNCS_IMPLEMENT_CALLBACKS \
|
|
HB_FONT_FUNC_IMPLEMENT (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;
|
|
|
|
/* Don't access these directly. Call hb_font_get_*() instead. */
|
|
|
|
struct {
|
|
#define HB_FONT_FUNC_IMPLEMENT(name) hb_font_get_##name##_func_t name;
|
|
HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
|
|
#undef HB_FONT_FUNC_IMPLEMENT
|
|
} get;
|
|
|
|
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;
|
|
};
|
|
|
|
|
|
/*
|
|
* hb_face_t
|
|
*/
|
|
|
|
struct hb_face_t {
|
|
hb_object_header_t header;
|
|
ASSERT_POD ();
|
|
|
|
hb_bool_t immutable;
|
|
|
|
hb_reference_table_func_t reference_table_func;
|
|
void *user_data;
|
|
hb_destroy_func_t destroy;
|
|
|
|
unsigned int index;
|
|
mutable unsigned int upem;
|
|
mutable unsigned int num_glyphs;
|
|
|
|
struct hb_shaper_data_t shaper_data;
|
|
|
|
struct plan_node_t {
|
|
hb_shape_plan_t *shape_plan;
|
|
plan_node_t *next;
|
|
} *shape_plans;
|
|
|
|
|
|
inline hb_blob_t *reference_table (hb_tag_t tag) const
|
|
{
|
|
hb_blob_t *blob;
|
|
|
|
if (unlikely (!this || !reference_table_func))
|
|
return hb_blob_get_empty ();
|
|
|
|
blob = reference_table_func (/*XXX*/const_cast<hb_face_t *> (this), tag, user_data);
|
|
if (unlikely (!blob))
|
|
return hb_blob_get_empty ();
|
|
|
|
return blob;
|
|
}
|
|
|
|
inline unsigned int get_upem (void) const
|
|
{
|
|
if (unlikely (!upem))
|
|
load_upem ();
|
|
return upem;
|
|
}
|
|
|
|
inline unsigned int get_num_glyphs (void) const
|
|
{
|
|
if (unlikely (num_glyphs == (unsigned int) -1))
|
|
load_num_glyphs ();
|
|
return num_glyphs;
|
|
}
|
|
|
|
private:
|
|
HB_INTERNAL void load_upem (void) const;
|
|
HB_INTERNAL void load_num_glyphs (void) const;
|
|
};
|
|
|
|
#define HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
|
|
#define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_PROTOTYPE(shaper, face);
|
|
#include "hb-shaper-list.hh"
|
|
#undef HB_SHAPER_IMPLEMENT
|
|
#undef HB_SHAPER_DATA_CREATE_FUNC_EXTRA_ARGS
|
|
|
|
|
|
/*
|
|
* 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 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 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 */
|
|
|
|
inline hb_bool_t get_glyph (hb_codepoint_t unicode, hb_codepoint_t variation_selector,
|
|
hb_codepoint_t *glyph)
|
|
{
|
|
*glyph = 0;
|
|
return klass->get.glyph (this, user_data,
|
|
unicode, variation_selector, glyph,
|
|
klass->user_data.glyph);
|
|
}
|
|
|
|
inline hb_position_t get_glyph_h_advance (hb_codepoint_t glyph)
|
|
{
|
|
return klass->get.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.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.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.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.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 left_glyph, hb_codepoint_t right_glyph)
|
|
{
|
|
return klass->get.glyph_v_kerning (this, user_data,
|
|
left_glyph, right_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.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.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.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.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_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_metics.ascent */
|
|
*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))) {
|
|
hb_bool_t ret = get_glyph_h_origin (glyph, x, y);
|
|
if (!ret && (ret = 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 {
|
|
hb_bool_t ret = get_glyph_v_origin (glyph, x, y);
|
|
if (!ret && (ret = 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_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_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;
|
|
|
|
snprintf (s, size, "gid%u", glyph);
|
|
}
|
|
|
|
/* 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_glyph (unichar, 0, glyph))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
private:
|
|
inline hb_position_t em_scale (int16_t v, int scale) { return v * (int64_t) scale / hb_face_get_upem (this->face); }
|
|
};
|
|
|
|
#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 */
|