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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_HH
#define HB_FONT_HH
#include "hb.hh"
#include "hb-face.hh"
#include "hb-atomic.hh"
#include "hb-draw.hh"
#include "hb-paint-extents.hh"
#include "hb-shaper.hh"
#include "hb-outline.hh"
/*
* hb_font_funcs_t
*/
#define HB_FONT_FUNCS_IMPLEMENT_CALLBACKS \
HB_FONT_FUNC_IMPLEMENT (get_,font_h_extents) \
HB_FONT_FUNC_IMPLEMENT (get_,font_v_extents) \
HB_FONT_FUNC_IMPLEMENT (get_,nominal_glyph) \
HB_FONT_FUNC_IMPLEMENT (get_,nominal_glyphs) \
HB_FONT_FUNC_IMPLEMENT (get_,variation_glyph) \
HB_FONT_FUNC_IMPLEMENT (get_,glyph_h_advance) \
HB_FONT_FUNC_IMPLEMENT (get_,glyph_v_advance) \
HB_FONT_FUNC_IMPLEMENT (get_,glyph_h_advances) \
HB_FONT_FUNC_IMPLEMENT (get_,glyph_v_advances) \
HB_FONT_FUNC_IMPLEMENT (get_,glyph_h_origin) \
HB_FONT_FUNC_IMPLEMENT (get_,glyph_v_origin) \
HB_FONT_FUNC_IMPLEMENT (get_,glyph_h_origins) \
HB_FONT_FUNC_IMPLEMENT (get_,glyph_v_origins) \
HB_FONT_FUNC_IMPLEMENT (get_,glyph_h_kerning) \
HB_IF_NOT_DEPRECATED (HB_FONT_FUNC_IMPLEMENT (get_,glyph_v_kerning)) \
HB_FONT_FUNC_IMPLEMENT (get_,glyph_extents) \
HB_FONT_FUNC_IMPLEMENT (get_,glyph_contour_point) \
HB_FONT_FUNC_IMPLEMENT (get_,glyph_name) \
HB_FONT_FUNC_IMPLEMENT (get_,glyph_from_name) \
HB_FONT_FUNC_IMPLEMENT (,draw_glyph_or_fail) \
HB_FONT_FUNC_IMPLEMENT (,paint_glyph_or_fail) \
/* ^--- Add new callbacks here */
struct hb_font_funcs_t
{
hb_object_header_t header;
struct {
#define HB_FONT_FUNC_IMPLEMENT(get_,name) void *name;
HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_FONT_FUNC_IMPLEMENT
} *user_data;
struct {
#define HB_FONT_FUNC_IMPLEMENT(get_,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(get_,name) hb_font_##get_##name##_func_t name;
HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_FONT_FUNC_IMPLEMENT
} f;
void (*array[0
#define HB_FONT_FUNC_IMPLEMENT(get_,name) +1
HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_FONT_FUNC_IMPLEMENT
]) ();
} get;
};
DECLARE_NULL_INSTANCE (hb_font_funcs_t);
/*
* hb_font_t
*/
#define HB_SHAPER_IMPLEMENT(shaper) HB_SHAPER_DATA_INSTANTIATE_SHAPERS(shaper, font);
#include "hb-shaper-list.hh"
#undef HB_SHAPER_IMPLEMENT
struct hb_font_t
{
hb_object_header_t header;
hb_atomic_t<unsigned> serial;
hb_atomic_t<unsigned> serial_coords;
hb_font_t *parent;
hb_face_t *face;
int32_t x_scale;
int32_t y_scale;
bool is_synthetic;
float x_embolden;
float y_embolden;
bool embolden_in_place;
int32_t x_strength; /* x_embolden, in scaled units. */
int32_t y_strength; /* y_embolden, in scaled units. */
float slant;
float slant_xy;
float x_multf;
float y_multf;
int64_t x_mult;
int64_t y_mult;
unsigned int x_ppem;
unsigned int y_ppem;
float ptem;
/* Font variation coordinates. */
unsigned int instance_index;
bool has_nonzero_coords;
unsigned int num_coords;
int *coords;
float *design_coords;
hb_font_funcs_t *klass;
void *user_data;
hb_destroy_func_t destroy;
hb_shaper_object_dataset_t<hb_font_t> data; /* Various shaper data. */
/* Convert from font-space to user-space */
int64_t dir_mult (hb_direction_t direction)
{ return HB_DIRECTION_IS_VERTICAL(direction) ? y_mult : x_mult; }
hb_position_t em_scale_x (int16_t v) { return em_mult (v, x_mult); }
hb_position_t em_scale_y (int16_t v) { return em_mult (v, y_mult); }
hb_position_t em_scalef_x (float v) { return em_multf (v, x_multf); }
hb_position_t em_scalef_y (float v) { return em_multf (v, y_multf); }
float em_fscale_x (int16_t v) { return em_fmult (v, x_multf); }
float em_fscale_y (int16_t v) { return em_fmult (v, y_multf); }
float em_fscalef_x (float v) { return em_fmultf (v, x_multf); }
float em_fscalef_y (float v) { return em_fmultf (v, y_multf); }
hb_position_t em_scale_dir (int16_t v, hb_direction_t direction)
{ return em_mult (v, dir_mult (direction)); }
/* Convert from parent-font user-space to our user-space */
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;
}
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;
}
hb_position_t parent_scale_x_position (hb_position_t v)
{ return parent_scale_x_distance (v); }
hb_position_t parent_scale_y_position (hb_position_t v)
{ return parent_scale_y_distance (v); }
void parent_scale_distance (hb_position_t *x, hb_position_t *y)
{
*x = parent_scale_x_distance (*x);
*y = parent_scale_y_distance (*y);
}
void parent_scale_position (hb_position_t *x, hb_position_t *y)
{
*x = parent_scale_x_position (*x);
*y = parent_scale_y_position (*y);
}
void scale_glyph_extents (hb_glyph_extents_t *extents)
{
float x1 = em_scale_x (extents->x_bearing);
float y1 = em_scale_y (extents->y_bearing);
float x2 = em_scale_x (extents->x_bearing + extents->width);
float y2 = em_scale_y (extents->y_bearing + extents->height);
extents->x_bearing = roundf (x1);
extents->y_bearing = roundf (y1);
extents->width = roundf (x2) - extents->x_bearing;
extents->height = roundf (y2) - extents->y_bearing;
}
void synthetic_glyph_extents (hb_glyph_extents_t *extents)
{
/* Slant. */
if (slant_xy)
{
hb_position_t x1 = extents->x_bearing;
hb_position_t y1 = extents->y_bearing;
hb_position_t x2 = extents->x_bearing + extents->width;
hb_position_t y2 = extents->y_bearing + extents->height;
x1 += floorf (hb_min (y1 * slant_xy, y2 * slant_xy));
x2 += ceilf (hb_max (y1 * slant_xy, y2 * slant_xy));
extents->x_bearing = x1;
extents->width = x2 - extents->x_bearing;
}
/* Embolden. */
if (x_strength || y_strength)
{
/* Y */
int y_shift = y_strength;
if (y_scale < 0) y_shift = -y_shift;
extents->y_bearing += y_shift;
extents->height -= y_shift;
/* X */
int x_shift = x_strength;
if (x_scale < 0) x_shift = -x_shift;
if (embolden_in_place)
extents->x_bearing -= x_shift / 2;
extents->width += x_shift;
}
}
/* Public getters */
HB_INTERNAL bool has_func (unsigned int i);
HB_INTERNAL bool has_func_set (unsigned int i);
/* has_* ... */
#define HB_FONT_FUNC_IMPLEMENT(get_,name) \
bool \
has_##name##_func () \
{ \
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); \
} \
bool \
has_##name##_func_set () \
{ \
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_set (i); \
}
HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_FONT_FUNC_IMPLEMENT
hb_bool_t get_font_h_extents (hb_font_extents_t *extents,
bool synthetic = true)
{
hb_memset (extents, 0, sizeof (*extents));
bool ret = klass->get.f.font_h_extents (this, user_data,
extents,
!klass->user_data ? nullptr : klass->user_data->font_h_extents);
if (synthetic && ret)
{
/* Embolden */
int y_shift = y_scale < 0 ? -y_strength : y_strength;
extents->ascender += y_shift;
}
return ret;
}
hb_bool_t get_font_v_extents (hb_font_extents_t *extents,
bool synthetic = true)
{
hb_memset (extents, 0, sizeof (*extents));
bool ret = klass->get.f.font_v_extents (this, user_data,
extents,
!klass->user_data ? nullptr : klass->user_data->font_v_extents);
if (synthetic && ret)
{
/* Embolden */
int x_shift = x_scale < 0 ? -x_strength : x_strength;
if (embolden_in_place)
{
extents->ascender += x_shift / 2;
extents->descender -= x_shift - x_shift / 2;
}
else
extents->ascender += x_shift;
}
return ret;
}
bool has_glyph (hb_codepoint_t unicode)
{
hb_codepoint_t glyph;
return get_nominal_glyph (unicode, &glyph);
}
hb_bool_t get_nominal_glyph (hb_codepoint_t unicode,
hb_codepoint_t *glyph,
hb_codepoint_t not_found = 0)
{
*glyph = not_found;
return klass->get.f.nominal_glyph (this, user_data,
unicode, glyph,
!klass->user_data ? nullptr : klass->user_data->nominal_glyph);
}
unsigned int get_nominal_glyphs (unsigned int count,
const hb_codepoint_t *first_unicode,
unsigned int unicode_stride,
hb_codepoint_t *first_glyph,
unsigned int glyph_stride)
{
return klass->get.f.nominal_glyphs (this, user_data,
count,
first_unicode, unicode_stride,
first_glyph, glyph_stride,
!klass->user_data ? nullptr : klass->user_data->nominal_glyphs);
}
hb_bool_t get_variation_glyph (hb_codepoint_t unicode, hb_codepoint_t variation_selector,
hb_codepoint_t *glyph,
hb_codepoint_t not_found = 0)
{
*glyph = not_found;
return klass->get.f.variation_glyph (this, user_data,
unicode, variation_selector, glyph,
!klass->user_data ? nullptr : klass->user_data->variation_glyph);
}
hb_position_t get_glyph_h_advance (hb_codepoint_t glyph,
bool synthetic = true)
{
hb_position_t advance = klass->get.f.glyph_h_advance (this, user_data,
glyph,
!klass->user_data ? nullptr : klass->user_data->glyph_h_advance);
if (synthetic && x_strength && !embolden_in_place)
{
/* Embolden */
hb_position_t strength = x_scale >= 0 ? x_strength : -x_strength;
advance += advance ? strength : 0;
}
return advance;
}
hb_position_t get_glyph_v_advance (hb_codepoint_t glyph,
bool synthetic = true)
{
hb_position_t advance = klass->get.f.glyph_v_advance (this, user_data,
glyph,
!klass->user_data ? nullptr : klass->user_data->glyph_v_advance);
if (synthetic && y_strength && !embolden_in_place)
{
/* Embolden */
hb_position_t strength = y_scale >= 0 ? y_strength : -y_strength;
advance += advance ? strength : 0;
}
return advance;
}
void get_glyph_h_advances (unsigned int count,
const hb_codepoint_t *first_glyph,
unsigned int glyph_stride,
hb_position_t *first_advance,
unsigned int advance_stride,
bool synthetic = true)
{
klass->get.f.glyph_h_advances (this, user_data,
count,
first_glyph, glyph_stride,
first_advance, advance_stride,
!klass->user_data ? nullptr : klass->user_data->glyph_h_advances);
if (synthetic && x_strength && !embolden_in_place)
{
/* Embolden */
hb_position_t strength = x_scale >= 0 ? x_strength : -x_strength;
for (unsigned int i = 0; i < count; i++)
{
*first_advance += *first_advance ? strength : 0;
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
}
}
}
void get_glyph_v_advances (unsigned int count,
const hb_codepoint_t *first_glyph,
unsigned int glyph_stride,
hb_position_t *first_advance,
unsigned int advance_stride,
bool synthetic = true)
{
klass->get.f.glyph_v_advances (this, user_data,
count,
first_glyph, glyph_stride,
first_advance, advance_stride,
!klass->user_data ? nullptr : klass->user_data->glyph_v_advances);
if (synthetic && y_strength && !embolden_in_place)
{
/* Embolden */
hb_position_t strength = y_scale >= 0 ? y_strength : -y_strength;
for (unsigned int i = 0; i < count; i++)
{
*first_advance += *first_advance ? strength : 0;
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
}
}
}
hb_bool_t get_glyph_h_origin (hb_codepoint_t glyph,
hb_position_t *x, hb_position_t *y,
bool synthetic = true)
{
*x = *y = 0;
bool ret = klass->get.f.glyph_h_origin (this, user_data,
glyph, x, y,
!klass->user_data ? nullptr : klass->user_data->glyph_h_origin);
if (synthetic && ret)
{
/* Slant */
if (slant_xy)
*x += roundf (*y * slant_xy);
/* Embolden */
if (!embolden_in_place)
{
*x += x_scale < 0 ? -x_strength : x_strength;
*y += y_scale < 0 ? -y_strength : y_strength;
}
}
return ret;
}
hb_bool_t get_glyph_v_origin (hb_codepoint_t glyph,
hb_position_t *x, hb_position_t *y,
bool synthetic = true)
{
*x = *y = 0;
bool ret = klass->get.f.glyph_v_origin (this, user_data,
glyph, x, y,
!klass->user_data ? nullptr : klass->user_data->glyph_v_origin);
if (synthetic && ret)
{
/* Slant */
if (slant_xy)
*x += roundf (*y * slant_xy);
/* Embolden */
if (!embolden_in_place)
{
*x += x_scale < 0 ? -x_strength : x_strength;
*y += y_scale < 0 ? -y_strength : y_strength;
}
}
return ret;
}
hb_bool_t get_glyph_h_origins (unsigned int count,
const hb_codepoint_t *first_glyph,
unsigned int glyph_stride,
hb_position_t *first_x,
unsigned int x_stride,
hb_position_t *first_y,
unsigned int y_stride,
bool synthetic = true)
{
bool ret = klass->get.f.glyph_h_origins (this, user_data,
count,
first_glyph, glyph_stride,
first_x, x_stride, first_y, y_stride,
!klass->user_data ? nullptr : klass->user_data->glyph_h_origins);
if (synthetic && ret)
{
hb_position_t x_shift = x_scale < 0 ? -x_strength : x_strength;
hb_position_t y_shift = y_scale < 0 ? -y_strength : y_strength;
for (unsigned i = 0; i < count; i++)
{
/* Slant */
if (slant_xy)
*first_x += roundf (*first_y * slant_xy);
/* Embolden */
if (!embolden_in_place)
{
*first_x += x_shift;
*first_y += y_shift;
}
}
first_x = &StructAtOffsetUnaligned<hb_position_t> (first_x, x_stride);
first_y = &StructAtOffsetUnaligned<hb_position_t> (first_y, y_stride);
}
return ret;
}
hb_bool_t get_glyph_v_origins (unsigned int count,
const hb_codepoint_t *first_glyph,
unsigned int glyph_stride,
hb_position_t *first_x,
unsigned int x_stride,
hb_position_t *first_y,
unsigned int y_stride,
bool synthetic = true)
{
bool ret = klass->get.f.glyph_v_origins (this, user_data,
count,
first_glyph, glyph_stride,
first_x, x_stride, first_y, y_stride,
!klass->user_data ? nullptr : klass->user_data->glyph_v_origins);
if (synthetic && is_synthetic && ret)
{
hb_position_t x_shift = x_scale < 0 ? -x_strength : x_strength;
hb_position_t y_shift = y_scale < 0 ? -y_strength : y_strength;
for (unsigned i = 0; i < count; i++)
{
/* Slant */
if (slant_xy)
*first_x += roundf (*first_y * slant_xy);
/* Embolden */
if (!embolden_in_place)
{
*first_x += x_shift;
*first_y += y_shift;
}
}
first_x = &StructAtOffsetUnaligned<hb_position_t> (first_x, x_stride);
first_y = &StructAtOffsetUnaligned<hb_position_t> (first_y, y_stride);
}
return ret;
}
hb_position_t get_glyph_h_kerning (hb_codepoint_t left_glyph,
hb_codepoint_t right_glyph)
{
#ifdef HB_DISABLE_DEPRECATED
return 0;
#else
return klass->get.f.glyph_h_kerning (this, user_data,
left_glyph, right_glyph,
!klass->user_data ? nullptr : klass->user_data->glyph_h_kerning);
#endif
}
hb_position_t get_glyph_v_kerning (hb_codepoint_t top_glyph,
hb_codepoint_t bottom_glyph)
{
#ifdef HB_DISABLE_DEPRECATED
return 0;
#else
return klass->get.f.glyph_v_kerning (this, user_data,
top_glyph, bottom_glyph,
!klass->user_data ? nullptr : klass->user_data->glyph_v_kerning);
#endif
}
hb_bool_t get_glyph_extents (hb_codepoint_t glyph,
hb_glyph_extents_t *extents,
bool synthetic = true)
{
hb_memset (extents, 0, sizeof (*extents));
/* This is rather messy, but necessary. */
if (!synthetic)
{
return klass->get.f.glyph_extents (this, user_data,
glyph,
extents,
!klass->user_data ? nullptr : klass->user_data->glyph_extents);
}
if (!is_synthetic &&
klass->get.f.glyph_extents (this, user_data,
glyph,
extents,
!klass->user_data ? nullptr : klass->user_data->glyph_extents))
return true;
/* Try getting extents from paint(), then draw(), *then* get_extents()
* and apply synthetic settings in the last case. */
#ifndef HB_NO_PAINT
hb_paint_extents_context_t paint_extents;
if (paint_glyph_or_fail (glyph,
hb_paint_extents_get_funcs (), &paint_extents,
0, 0))
{
*extents = paint_extents.get_extents ().to_glyph_extents ();
return true;
}
#endif
#ifndef HB_NO_DRAW
hb_extents_t<> draw_extents;
if (draw_glyph_or_fail (glyph,
hb_draw_extents_get_funcs (), &draw_extents))
{
*extents = draw_extents.to_glyph_extents ();
return true;
}
#endif
bool ret = klass->get.f.glyph_extents (this, user_data,
glyph,
extents,
!klass->user_data ? nullptr : klass->user_data->glyph_extents);
if (ret)
synthetic_glyph_extents (extents);
return ret;
}
hb_bool_t get_glyph_contour_point (hb_codepoint_t glyph, unsigned int point_index,
hb_position_t *x, hb_position_t *y,
bool synthetic = true)
{
*x = *y = 0;
bool ret = klass->get.f.glyph_contour_point (this, user_data,
glyph, point_index,
x, y,
!klass->user_data ? nullptr : klass->user_data->glyph_contour_point);
if (synthetic && ret)
{
/* Slant */
if (slant_xy)
*x += roundf (*y * slant_xy);
/* Embolden */
if (!embolden_in_place)
{
int x_shift = x_scale < 0 ? -x_strength : x_strength;
*x += x_shift;
}
}
return ret;
}
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 ? nullptr : klass->user_data->glyph_name);
}
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 ? nullptr : klass->user_data->glyph_from_name);
}
bool draw_glyph_or_fail (hb_codepoint_t glyph,
hb_draw_funcs_t *draw_funcs, void *draw_data,
bool synthetic = true)
{
#ifndef HB_NO_DRAW
#ifndef HB_NO_OUTLINE
bool embolden = x_strength || y_strength;
bool slanted = slant_xy;
synthetic = synthetic && (embolden || slanted);
#else
synthetic = false;
#endif
if (!synthetic)
{
return klass->get.f.draw_glyph_or_fail (this, user_data,
glyph,
draw_funcs, draw_data,
!klass->user_data ? nullptr : klass->user_data->draw_glyph_or_fail);
}
#ifndef HB_NO_OUTLINE
hb_outline_t outline;
if (!klass->get.f.draw_glyph_or_fail (this, user_data,
glyph,
hb_outline_recording_pen_get_funcs (), &outline,
!klass->user_data ? nullptr : klass->user_data->draw_glyph_or_fail))
return false;
// Slant before embolden; produces nicer results.
if (slanted)
outline.slant (slant_xy);
if (embolden)
{
float x_shift = embolden_in_place ? 0 : (float) x_strength / 2;
float y_shift = (float) y_strength / 2;
if (x_scale < 0) x_shift = -x_shift;
if (y_scale < 0) y_shift = -y_shift;
outline.embolden (x_strength, y_strength, x_shift, y_shift);
}
outline.replay (draw_funcs, draw_data);
return true;
#endif
#endif
return false;
}
bool paint_glyph_or_fail (hb_codepoint_t glyph,
hb_paint_funcs_t *paint_funcs, void *paint_data,
unsigned int palette,
hb_color_t foreground,
bool synthetic = true)
{
#ifndef HB_NO_PAINT
/* Slant */
if (synthetic && slant_xy)
hb_paint_push_transform (paint_funcs, paint_data,
1.f, 0.f,
slant_xy, 1.f,
0.f, 0.f);
bool ret = klass->get.f.paint_glyph_or_fail (this, user_data,
glyph,
paint_funcs, paint_data,
palette, foreground,
!klass->user_data ? nullptr : klass->user_data->paint_glyph_or_fail);
if (synthetic && slant_xy)
hb_paint_pop_transform (paint_funcs, paint_data);
return ret;
#endif
return false;
}
/* A bit higher-level, and with fallback */
HB_INTERNAL
void paint_glyph (hb_codepoint_t glyph,
hb_paint_funcs_t *paint_funcs, void *paint_data,
unsigned int palette,
hb_color_t foreground);
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;
}
}
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;
}
}
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);
}
void get_glyph_advance_for_direction (hb_codepoint_t glyph,
hb_direction_t direction,
hb_position_t *x, hb_position_t *y)
{
*x = *y = 0;
if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
*x = get_glyph_h_advance (glyph);
else
*y = get_glyph_v_advance (glyph);
}
void get_glyph_advances_for_direction (hb_direction_t direction,
unsigned int count,
const hb_codepoint_t *first_glyph,
unsigned glyph_stride,
hb_position_t *first_advance,
unsigned advance_stride)
{
if (likely (HB_DIRECTION_IS_HORIZONTAL (direction)))
get_glyph_h_advances (count, first_glyph, glyph_stride, first_advance, advance_stride);
else
get_glyph_v_advances (count, first_glyph, glyph_stride, first_advance, advance_stride);
}
void apply_offset (hb_position_t *x, hb_position_t *y,
hb_position_t dx, hb_position_t dy,
signed mult)
{
assert (mult == -1 || mult == +1);
*x += dx * mult;
*y += dy * mult;
}
void add_offset (hb_position_t *x, hb_position_t *y,
hb_position_t dx, hb_position_t dy)
{
*x += dx;
*y += dy;
}
void subtract_offset (hb_position_t *x, hb_position_t *y,
hb_position_t dx, hb_position_t dy)
{
*x -= dx;
*y -= dy;
}
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;
hb_font_extents_t extents;
get_h_extents_with_fallback (&extents);
*y = extents.ascender;
}
void apply_glyph_h_origins_with_fallback (hb_buffer_t *buf, int mult)
{
bool has_ascender = false;
hb_position_t ascender = 0;
struct { hb_position_t x, y; } origins[32];
unsigned int offset = 0;
unsigned int count = buf->len;
while (offset < count)
{
unsigned n = hb_min (count - offset, ARRAY_LENGTH (origins));
if (!get_glyph_h_origins (n,
&buf->info[offset].codepoint, sizeof (hb_glyph_info_t),
&origins[0].x, sizeof (origins[0]),
&origins[0].y, sizeof (origins[0])))
{
if (get_glyph_v_origins (n,
&buf->info[offset].codepoint, sizeof (hb_glyph_info_t),
&origins[0].x, sizeof (origins[0]),
&origins[0].y, sizeof (origins[0])))
{
if (!has_ascender)
{
hb_font_extents_t extents;
get_h_extents_with_fallback (&extents);
ascender = extents.ascender;
has_ascender = true;
}
/* We got the v_origins, adjust them to h_origins. */
for (unsigned j = 0; j < n; j++)
{
hb_codepoint_t glyph = buf->info[offset + j].codepoint;
origins[j].x -= get_glyph_h_advance (glyph) / 2;
origins[j].y -= ascender;
}
}
else
{
for (unsigned j = 0; j < n; j++)
{
origins[j].x = 0;
origins[j].y = 0;
}
}
}
assert (mult == -1 || mult == +1);
if (mult == +1)
for (unsigned j = 0; j < n; j++)
{
hb_glyph_position_t *pos = &buf->pos[offset + j];
add_offset (&pos->x_offset, &pos->y_offset,
origins[j].x, origins[j].y);
}
else /* mult == -1 */
for (unsigned j = 0; j < n; j++)
{
hb_glyph_position_t *pos = &buf->pos[offset + j];
subtract_offset (&pos->x_offset, &pos->y_offset,
origins[j].x, origins[j].y);
}
offset += n;
}
}
void apply_glyph_v_origins_with_fallback (hb_buffer_t *buf, int mult)
{
bool has_ascender = false;
hb_position_t ascender = 0;
struct { hb_position_t x, y; } origins[32];
unsigned int offset = 0;
unsigned int count = buf->len;
while (offset < count)
{
unsigned n = hb_min (count - offset, ARRAY_LENGTH (origins));
if (!get_glyph_v_origins (n,
&buf->info[offset].codepoint, sizeof (hb_glyph_info_t),
&origins[0].x, sizeof (origins[0]),
&origins[0].y, sizeof (origins[0])))
{
if (get_glyph_h_origins (n,
&buf->info[offset].codepoint, sizeof (hb_glyph_info_t),
&origins[0].x, sizeof (origins[0]),
&origins[0].y, sizeof (origins[0])))
{
if (!has_ascender)
{
hb_font_extents_t extents;
get_h_extents_with_fallback (&extents);
ascender = extents.ascender;
has_ascender = true;
}
/* We got the h_origins, adjust them to v_origins. */
for (unsigned j = 0; j < n; j++)
{
hb_codepoint_t glyph = buf->info[offset + j].codepoint;
origins[j].x += get_glyph_h_advance (glyph) / 2;
origins[j].y += ascender;
}
}
else
{
for (unsigned j = 0; j < n; j++)
{
origins[j].x = 0;
origins[j].y = 0;
}
}
}
assert (mult == -1 || mult == +1);
if (mult == +1)
for (unsigned j = 0; j < n; j++)
{
hb_glyph_position_t *pos = &buf->pos[offset + j];
add_offset (&pos->x_offset, &pos->y_offset,
origins[j].x, origins[j].y);
}
else /* mult == -1 */
for (unsigned j = 0; j < n; j++)
{
hb_glyph_position_t *pos = &buf->pos[offset + j];
subtract_offset (&pos->x_offset, &pos->y_offset,
origins[j].x, origins[j].y);
}
offset += n;
}
}
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);
subtract_offset (x, y, dx, dy);
}
}
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);
add_offset (x, y, dx, dy);
}
}
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);
}
void add_glyph_h_origins (hb_buffer_t *buf)
{
apply_glyph_h_origins_with_fallback (buf, +1);
}
void add_glyph_v_origins (hb_buffer_t *buf)
{
apply_glyph_v_origins_with_fallback (buf, +1);
}
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);
add_offset (x, y, origin_x, origin_y);
}
void subtract_glyph_h_origins (hb_buffer_t *buf)
{
apply_glyph_h_origins_with_fallback (buf, -1);
}
void subtract_glyph_v_origins (hb_buffer_t *buf)
{
apply_glyph_v_origins_with_fallback (buf, -1);
}
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);
subtract_offset (x, y, origin_x, origin_y);
}
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);
}
}
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;
}
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. */
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%" PRIu32, glyph) < 0)
*s = '\0';
}
/* Parses gidDDD and uniUUUU strings automatically. */
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;
}
void changed ()
{
float upem = face->get_upem ();
x_multf = x_scale / upem;
y_multf = y_scale / upem;
bool x_neg = x_scale < 0;
x_mult = (x_neg ? -((int64_t) -x_scale << 16) : ((int64_t) x_scale << 16)) / upem;
bool y_neg = y_scale < 0;
y_mult = (y_neg ? -((int64_t) -y_scale << 16) : ((int64_t) y_scale << 16)) / upem;
is_synthetic = x_embolden || y_embolden || slant;
x_strength = roundf (abs (x_scale) * x_embolden);
y_strength = roundf (abs (y_scale) * y_embolden);
slant_xy = y_scale ? slant * x_scale / y_scale : 0.f;
data.fini ();
serial++;
}
hb_position_t em_mult (int16_t v, int64_t mult)
{ return (hb_position_t) ((v * mult + 32768) >> 16); }
hb_position_t em_multf (float v, float mult)
{ return (hb_position_t) roundf (em_fmultf (v, mult)); }
float em_fmultf (float v, float mult)
{ return v * mult; }
float em_fmult (int16_t v, float mult)
{ return (float) v * mult; }
};
DECLARE_NULL_INSTANCE (hb_font_t);
#endif /* HB_FONT_HH */