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Merge pull request #4097 from harfbuzz/embolden 

Embolden
This commit is contained in:
Behdad Esfahbod 2023-02-10 12:50:45 -07:00 committed by GitHub
parent 219e2f12f0 737b15c5a0
commit 8302da8630
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GPG Key ID: 4AEE18F83AFDEB23
15 changed files with 717 additions and 17 deletions
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4
COPYING
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@ -12,13 +12,13 @@ Copyright © 2009 Keith Stribley
Copyright © 2011 Martin Hosken and SIL International
Copyright © 2007 Chris Wilson
Copyright © 2005,2006,2020,2021,2022,2023 Behdad Esfahbod
Copyright © 2005 David Turner
Copyright © 2004,2007,2008,2009,2010,2013,2021,2022,2023 Red Hat, Inc.
Copyright © 1998-2004 David Turner and Werner Lemberg
Copyright © 1998-2005 David Turner and Werner Lemberg
Copyright © 2016 Igalia S.L.
Copyright © 2022 Matthias Clasen
Copyright © 2018,2021 Khaled Hosny
Copyright © 2018,2019,2020 Adobe, Inc
Copyright © 2013-2015 Alexei Podtelezhnikov
For full copyright notices consult the individual files in the package.

2
docs/harfbuzz-sections.txt
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@ -416,6 +416,8 @@ hb_font_set_ptem
hb_font_get_ptem
hb_font_set_scale
hb_font_get_scale
hb_font_get_synthetic_bold
hb_font_set_synthetic_bold
hb_font_set_synthetic_slant
hb_font_get_synthetic_slant
hb_font_set_variations

2
src/Makefile.sources
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@ -85,6 +85,8 @@ HB_BASE_sources = \
hb-ot-layout-common.hh \
hb-ot-layout-gdef-table.hh \
hb-ot-layout-gpos-table.hh \
hb-outline.hh \
hb-outline.cc \
hb-paint.cc \
hb-paint.hh \
hb-paint-extents.cc \

1
src/harfbuzz-subset.cc
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@ -41,6 +41,7 @@
#include "hb-ot-shaper-vowel-constraints.cc"
#include "hb-ot-tag.cc"
#include "hb-ot-var.cc"
#include "hb-outline.cc"
#include "hb-paint-extents.cc"
#include "hb-paint.cc"
#include "hb-set.cc"

1
src/harfbuzz.cc
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@ -46,6 +46,7 @@
#include "hb-ot-shaper-vowel-constraints.cc"
#include "hb-ot-tag.cc"
#include "hb-ot-var.cc"
#include "hb-outline.cc"
#include "hb-paint-extents.cc"
#include "hb-paint.cc"
#include "hb-set.cc"

83
src/hb-font.cc
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@ -1772,8 +1772,13 @@ DEFINE_NULL_INSTANCE (hb_font_t) =
1000, /* x_scale */
1000, /* y_scale */
0., /* slant */
0., /* slant_xy; */
0.f, /* x_embolden */
0.f, /* y_embolden */
true, /* embolden_in_place */
0, /* x_strength */
0, /* y_strength */
0.f, /* slant */
0.f, /* slant_xy; */
1.f, /* x_multf */
1.f, /* y_multf */
1<<16, /* x_mult */
@ -1811,6 +1816,7 @@ _hb_font_create (hb_face_t *face)
font->klass = hb_font_funcs_get_empty ();
font->data.init0 (font);
font->x_scale = font->y_scale = face->get_upem ();
font->embolden_in_place = true;
font->x_multf = font->y_multf = 1.f;
font->x_mult = font->y_mult = 1 << 16;
font->instance_index = HB_FONT_NO_VAR_NAMED_INSTANCE;
@ -1895,6 +1901,9 @@ hb_font_create_sub_font (hb_font_t *parent)
font->x_scale = parent->x_scale;
font->y_scale = parent->y_scale;
font->x_embolden = parent->x_embolden;
font->y_embolden = parent->y_embolden;
font->embolden_in_place = parent->embolden_in_place;
font->slant = parent->slant;
font->x_ppem = parent->x_ppem;
font->y_ppem = parent->y_ppem;
@ -2442,6 +2451,76 @@ hb_font_get_ptem (hb_font_t *font)
return font->ptem;
}
/**
* hb_font_set_synthetic_bold:
* @font: #hb_font_t to work upon
* @x_embolden: the amount to embolden horizontally
* @y_embolden: the amount to embolden vertically
* @in_place: whether to embolden glyphs in-place
*
* Sets the "synthetic boldness" of a font.
*
* Positive values for @x_embolden / @y_embolden make a font
* bolder, negative values thinner. Typical values are in the
* 0.01 to 0.05 range. The default value is zero.
*
* Synthetic boldness is applied by offsetting the contour
* points of the glyph shape.
*
* Synthetic boldness is applied when rendering a glyph via
* hb_font_draw_glyph().
*
* If @in_place is %FALSE, then glyph advance-widths are also
* adjusted, otherwise they are not. The in-place mode is
* useful for simulating [font grading](https://fonts.google.com/knowledge/glossary/grade).
*
*
* Since: REPLACEME
**/
void
hb_font_set_synthetic_bold (hb_font_t *font,
float x_embolden,
float y_embolden,
hb_bool_t in_place)
{
if (hb_object_is_immutable (font))
return;
if (font->x_embolden == x_embolden &&
font->y_embolden == y_embolden &&
font->embolden_in_place == in_place)
return;
font->serial++;
font->x_embolden = x_embolden;
font->y_embolden = y_embolden;
font->embolden_in_place = in_place;
font->mults_changed ();
}
/**
* hb_font_get_synthetic_bold:
* @font: #hb_font_t to work upon
* @x_embolden: (out): return location for horizontal value
* @y_embolden: (out): return location for vertical value
* @in_place: (out): return location for in-place value
*
* Fetches the "synthetic boldness" parameters of a font.
*
* Since: REPLACEME
**/
void
hb_font_get_synthetic_bold (hb_font_t *font,
float *x_embolden,
float *y_embolden,
hb_bool_t *in_place)
{
if (x_embolden) *x_embolden = font->x_embolden;
if (y_embolden) *y_embolden = font->y_embolden;
if (in_place) *in_place = font->embolden_in_place;
}
/**
* hb_font_set_synthetic_slant:
* @font: #hb_font_t to work upon

10
src/hb-font.h
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@ -1131,6 +1131,16 @@ hb_font_set_ptem (hb_font_t *font, float ptem);
HB_EXTERN float
hb_font_get_ptem (hb_font_t *font);
HB_EXTERN void
hb_font_set_synthetic_bold (hb_font_t *font,
float x_embolden, float y_embolden,
hb_bool_t in_place);
HB_EXTERN void
hb_font_get_synthetic_bold (hb_font_t *font,
float *x_embolden, float *y_embolden,
hb_bool_t *in_place);
HB_EXTERN void
hb_font_set_synthetic_slant (hb_font_t *font, float slant);

28
src/hb-font.hh
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@ -113,8 +113,16 @@ struct hb_font_t
int32_t x_scale;
int32_t y_scale;
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;
@ -200,6 +208,21 @@ struct hb_font_t
extents->width = ceilf (x2) - extents->x_bearing;
extents->height = ceilf (y2) - extents->y_bearing;
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;
}
}
@ -666,12 +689,17 @@ struct hb_font_t
void mults_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;
x_strength = fabs (roundf (x_scale * x_embolden));
y_strength = fabs (roundf (y_scale * y_embolden));
slant_xy = y_scale ? slant * x_scale / y_scale : 0.f;
data.fini ();

69
src/hb-ft.cc
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@ -45,6 +45,7 @@
#include FT_MULTIPLE_MASTERS_H
#include FT_OUTLINE_H
#include FT_TRUETYPE_TABLES_H
#include FT_SYNTHESIS_H
#if (FREETYPE_MAJOR*10000 + FREETYPE_MINOR*100 + FREETYPE_PATCH) >= 21300
#include FT_COLOR_H
#endif
@ -447,6 +448,7 @@ hb_ft_get_glyph_h_advances (hb_font_t* font, void* font_data,
void *user_data HB_UNUSED)
{
const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
hb_position_t *orig_first_advance = first_advance;
hb_lock_t lock (ft_font->lock);
FT_Face ft_face = ft_font->ft_face;
int load_flags = ft_font->load_flags;
@ -487,6 +489,18 @@ hb_ft_get_glyph_h_advances (hb_font_t* font, void* font_data,
first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
}
if (font->x_strength && !font->embolden_in_place)
{
/* Emboldening. */
hb_position_t x_strength = font->x_scale >= 0 ? font->x_strength : -font->x_strength;
first_advance = orig_first_advance;
for (unsigned int i = 0; i < count; i++)
{
*first_advance += *first_advance ? x_strength : 0;
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
}
}
}
#ifndef HB_NO_VERTICAL
@ -522,7 +536,8 @@ hb_ft_get_glyph_v_advance (hb_font_t *font,
/* Note: FreeType's vertical metrics grows downward while other FreeType coordinates
* have a Y growing upward. Hence the extra negation. */
return (-v + (1<<9)) >> 10;
hb_position_t y_strength = font->y_scale >= 0 ? font->y_strength : -font->y_strength;
return ((-v + (1<<9)) >> 10) + (font->embolden_in_place ? 0 : y_strength);
}
#endif
@ -642,6 +657,22 @@ hb_ft_get_glyph_extents (hb_font_t *font,
extents->width = ceilf (x2) - extents->x_bearing;
extents->height = ceilf (y2) - extents->y_bearing;
if (font->x_strength || font->y_strength)
{
/* Y */
int y_shift = font->y_strength;
if (font->y_scale < 0) y_shift = -y_shift;
extents->y_bearing += y_shift;
extents->height -= y_shift;
/* X */
int x_shift = font->x_strength;
if (font->x_scale < 0) x_shift = -x_shift;
if (font->embolden_in_place)
extents->x_bearing -= x_shift / 2;
extents->width += x_shift;
}
return true;
}
@ -763,7 +794,7 @@ hb_ft_get_font_h_extents (hb_font_t *font HB_UNUSED,
metrics->line_gap = ft_face->size->metrics.height - (metrics->ascender - metrics->descender);
}
metrics->ascender = (hb_position_t) (y_mult * metrics->ascender);
metrics->ascender = (hb_position_t) (y_mult * (metrics->ascender + font->y_strength));
metrics->descender = (hb_position_t) (y_mult * metrics->descender);
metrics->line_gap = (hb_position_t) (y_mult * metrics->line_gap);
@ -815,7 +846,7 @@ _hb_ft_cubic_to (const FT_Vector *control1,
}
static void
hb_ft_draw_glyph (hb_font_t *font HB_UNUSED,
hb_ft_draw_glyph (hb_font_t *font,
void *font_data,
hb_codepoint_t glyph,
hb_draw_funcs_t *draw_funcs, void *draw_data,
@ -843,6 +874,38 @@ hb_ft_draw_glyph (hb_font_t *font HB_UNUSED,
hb_draw_session_t draw_session (draw_funcs, draw_data, font->slant_xy);
/* Embolden */
if (font->x_strength || font->y_strength)
{
FT_Outline_EmboldenXY (&ft_face->glyph->outline, font->x_strength, font->y_strength);
int x_shift = 0;
int y_shift = 0;
if (font->embolden_in_place)
{
/* Undo the FreeType shift. */
x_shift = -font->x_strength / 2;
y_shift = 0;
if (font->y_scale < 0) y_shift = -font->y_strength;
}
else
{
/* FreeType applied things in the wrong direction for negative scale; fix up. */
if (font->x_scale < 0) x_shift = -font->x_strength;
if (font->y_scale < 0) y_shift = -font->y_strength;
}
if (x_shift || y_shift)
{
auto &outline = ft_face->glyph->outline;
for (auto &point : hb_iter (outline.points, outline.contours[outline.n_contours - 1] + 1))
{
point.x += x_shift;
point.y += y_shift;
}
}
}
FT_Outline_Decompose (&ft_face->glyph->outline,
&outline_funcs,
&draw_session);

66
src/hb-ot-font.cc
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@ -34,6 +34,7 @@
#include "hb-font.hh"
#include "hb-machinery.hh"
#include "hb-ot-face.hh"
#include "hb-outline.hh"
#include "hb-ot-cmap-table.hh"
#include "hb-ot-glyf-table.hh"
@ -180,10 +181,13 @@ hb_ot_get_glyph_h_advances (hb_font_t* font, void* font_data,
unsigned advance_stride,
void *user_data HB_UNUSED)
{
const hb_ot_font_t *ot_font = (const hb_ot_font_t *) font_data;
const hb_ot_face_t *ot_face = ot_font->ot_face;
const OT::hmtx_accelerator_t &hmtx = *ot_face->hmtx;
hb_position_t *orig_first_advance = first_advance;
#ifndef HB_NO_VAR
const OT::HVAR &HVAR = *hmtx.var_table;
const OT::VariationStore &varStore = &HVAR + HVAR.varStore;
@ -257,6 +261,18 @@ hb_ot_get_glyph_h_advances (hb_font_t* font, void* font_data,
#ifndef HB_NO_VAR
OT::VariationStore::destroy_cache (varStore_cache);
#endif
if (font->x_strength && !font->embolden_in_place)
{
/* Emboldening. */
hb_position_t x_strength = font->x_scale >= 0 ? font->x_strength : -font->x_strength;
first_advance = orig_first_advance;
for (unsigned int i = 0; i < count; i++)
{
*first_advance += *first_advance ? x_strength : 0;
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
}
}
}
#ifndef HB_NO_VERTICAL
@ -273,6 +289,8 @@ hb_ot_get_glyph_v_advances (hb_font_t* font, void* font_data,
const hb_ot_face_t *ot_face = ot_font->ot_face;
const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx;
hb_position_t *orig_first_advance = first_advance;
if (vmtx.has_data ())
{
#ifndef HB_NO_VAR
@ -307,6 +325,18 @@ hb_ot_get_glyph_v_advances (hb_font_t* font, void* font_data,
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
}
}
if (font->y_strength && !font->embolden_in_place)
{
/* Emboldening. */
hb_position_t y_strength = font->y_scale >= 0 ? font->y_strength : -font->y_strength;
first_advance = orig_first_advance;
for (unsigned int i = 0; i < count; i++)
{
*first_advance += *first_advance ? y_strength : 0;
first_advance = &StructAtOffsetUnaligned<hb_position_t> (first_advance, advance_stride);
}
}
}
#endif
@ -436,9 +466,16 @@ hb_ot_get_font_h_extents (hb_font_t *font,
hb_font_extents_t *metrics,
void *user_data HB_UNUSED)
{
return _hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER, &metrics->ascender) &&
bool ret = _hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_HORIZONTAL_ASCENDER, &metrics->ascender) &&
_hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_HORIZONTAL_DESCENDER, &metrics->descender) &&
_hb_ot_metrics_get_position_common (font, HB_OT_METRICS_TAG_HORIZONTAL_LINE_GAP, &metrics->line_gap);
/* Embolden */
int y_shift = font->y_strength;
if (font->y_scale < 0) y_shift = -y_shift;
metrics->ascender += y_shift;
return ret;
}
#ifndef HB_NO_VERTICAL
@ -462,12 +499,31 @@ hb_ot_draw_glyph (hb_font_t *font,
hb_draw_funcs_t *draw_funcs, void *draw_data,
void *user_data)
{
hb_draw_session_t draw_session (draw_funcs, draw_data, font->slant_xy);
if (font->face->table.glyf->get_path (font, glyph, draw_session)) return;
bool embolden = font->x_strength || font->y_strength;
hb_outline_t outline;
{ // Need draw_session to be destructed before emboldening.
hb_draw_session_t draw_session (embolden ? hb_outline_recording_pen_get_funcs () : draw_funcs,
embolden ? &outline : draw_data, font->slant_xy);
if (!font->face->table.glyf->get_path (font, glyph, draw_session))
#ifndef HB_NO_CFF
if (font->face->table.cff1->get_path (font, glyph, draw_session)) return;
if (font->face->table.cff2->get_path (font, glyph, draw_session)) return;
if (!font->face->table.cff1->get_path (font, glyph, draw_session))
if (!font->face->table.cff2->get_path (font, glyph, draw_session))
#endif
{}
}
if (embolden)
{
float x_shift = font->embolden_in_place ? 0 : font->x_strength / 2;
float y_shift = font->y_strength / 2;
if (font->x_scale < 0) x_shift = -x_shift;
if (font->y_scale < 0) y_shift = -y_shift;
outline.embolden (font->x_strength, font->y_strength,
x_shift, y_shift);
outline.replay (draw_funcs, draw_data);
}
}
#endif

322
src/hb-outline.cc Normal file
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@ -0,0 +1,322 @@
/*
* Copyright © 2023 Behdad Esfahbod
* Copyright © 1999 David Turner
* Copyright © 2005 Werner Lemberg
* Copyright © 2013-2015 Alexei Podtelezhnikov
*
*
* 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.
*/
#include "hb.hh"
#ifndef HB_NO_OUTLINE
#include "hb-outline.hh"
#include "hb-machinery.hh"
void hb_outline_t::replay (hb_draw_funcs_t *pen, void *pen_data) const
{
hb_draw_state_t st = HB_DRAW_STATE_DEFAULT;
unsigned first = 0;
for (unsigned contour : contours)
{
auto it = points.as_array ().sub_array (first, contour - first);
while (it)
{
hb_outline_point_t p1 = *it++;
switch (p1.type)
{
case hb_outline_point_t::type_t::MOVE_TO:
{
pen->move_to (pen_data, st,
p1.x, p1.y);
}
break;
case hb_outline_point_t::type_t::LINE_TO:
{
pen->line_to (pen_data, st,
p1.x, p1.y);
}
break;
case hb_outline_point_t::type_t::QUADRATIC_TO:
{
hb_outline_point_t p2 = *it++;
pen->quadratic_to (pen_data, st,
p1.x, p1.y,
p2.x, p2.y);
}
break;
case hb_outline_point_t::type_t::CUBIC_TO:
{
hb_outline_point_t p2 = *it++;
hb_outline_point_t p3 = *it++;
pen->cubic_to (pen_data, st,
p1.x, p1.y,
p2.x, p2.y,
p3.x, p3.y);
}
break;
}
}
pen->close_path (pen_data, st);
first = contour;
}
}
float hb_outline_t::area () const
{
float a = 0;
unsigned first = 0;
for (unsigned contour : contours)
{
for (unsigned i = first; i < contour; i++)
{
unsigned j = i + 1 < contour ? i + 1 : first;
auto &pi = points[i];
auto &pj = points[j];
a += pi.x * pj.y - pi.y * pj.x;
}
first = contour;
}
return a * .5f;
}
void hb_outline_t::embolden (float x_strength, float y_strength,
float x_shift, float y_shift)
{
/* This function is a straight port of FreeType's FT_Outline_EmboldenXY.
* Permission has been obtained from the FreeType authors of the code
* to relicense it under the HarfBuzz license. */
if (!x_strength && !y_strength) return;
if (!points) return;
x_strength /= 2.f;
y_strength /= 2.f;
bool orientation_negative = area () < 0;
signed first = 0;
for (unsigned c = 0; c < contours.length; c++)
{
hb_outline_vector_t in, out, anchor, shift;
float l_in, l_out, l_anchor = 0, l, q, d;
l_in = 0;
signed last = (int) contours[c] - 1;
/* pacify compiler */
in.x = in.y = anchor.x = anchor.y = 0;
/* Counter j cycles though the points; counter i advances only */
/* when points are moved; anchor k marks the first moved point. */
for ( signed i = last, j = first, k = -1;
j != i && i != k;
j = j < last ? j + 1 : first )
{
if ( j != k )
{
out.x = points[j].x - points[i].x;
out.y = points[j].y - points[i].y;
l_out = out.normalize_len ();
if ( l_out == 0 )
continue;
}
else
{
out = anchor;
l_out = l_anchor;
}
if ( l_in != 0 )
{
if ( k < 0 )
{
k = i;
anchor = in;
l_anchor = l_in;
}
d = in.x * out.x + in.y * out.y;
/* shift only if turn is less than ~160 degrees */
if ( d > -15.f/16.f )
{
d = d + 1.f;
/* shift components along lateral bisector in proper orientation */
shift.x = in.y + out.y;
shift.y = in.x + out.x;
if ( orientation_negative )
shift.x = -shift.x;
else
shift.y = -shift.y;
/* restrict shift magnitude to better handle collapsing segments */
q = out.x * in.y - out.y * in.x;
if ( orientation_negative )
q = -q;
l = hb_min (l_in, l_out);
/* non-strict inequalities avoid divide-by-zero when q == l == 0 */
if (x_strength * q <= l * d)
shift.x = shift.x * x_strength / d;
else
shift.x = shift.x * l / q;
if (y_strength * q <= l * d)
shift.y = shift.y * y_strength / d;
else
shift.y = shift.y * l / q;
}
else
shift.x = shift.y = 0;
for ( ;
i != j;
i = i < last ? i + 1 : first )
{
points[i].x += x_shift + shift.x;
points[i].y += y_shift + shift.y;
}
}
else
i = j;
in = out;
l_in = l_out;
}
first = last + 1;
}
}
static void
hb_outline_recording_pen_move_to (hb_draw_funcs_t *dfuncs HB_UNUSED,
void *data,
hb_draw_state_t *st,
float to_x, float to_y,
void *user_data HB_UNUSED)
{
hb_outline_t *c = (hb_outline_t *) data;
c->points.push (hb_outline_point_t {to_x, to_y, hb_outline_point_t::type_t::MOVE_TO});
}
static void
hb_outline_recording_pen_line_to (hb_draw_funcs_t *dfuncs HB_UNUSED,
void *data,
hb_draw_state_t *st,
float to_x, float to_y,
void *user_data HB_UNUSED)
{
hb_outline_t *c = (hb_outline_t *) data;
c->points.push (hb_outline_point_t {to_x, to_y, hb_outline_point_t::type_t::LINE_TO});
}
static void
hb_outline_recording_pen_quadratic_to (hb_draw_funcs_t *dfuncs HB_UNUSED,
void *data,
hb_draw_state_t *st,
float control_x, float control_y,
float to_x, float to_y,
void *user_data HB_UNUSED)
{
hb_outline_t *c = (hb_outline_t *) data;
c->points.push (hb_outline_point_t {control_x, control_y, hb_outline_point_t::type_t::QUADRATIC_TO});
c->points.push (hb_outline_point_t {to_x, to_y, hb_outline_point_t::type_t::QUADRATIC_TO});
}
static void
hb_outline_recording_pen_cubic_to (hb_draw_funcs_t *dfuncs HB_UNUSED,
void *data,
hb_draw_state_t *st,
float control1_x, float control1_y,
float control2_x, float control2_y,
float to_x, float to_y,
void *user_data HB_UNUSED)
{
hb_outline_t *c = (hb_outline_t *) data;
c->points.push (hb_outline_point_t {control1_x, control1_y, hb_outline_point_t::type_t::CUBIC_TO});
c->points.push (hb_outline_point_t {control2_x, control2_y, hb_outline_point_t::type_t::CUBIC_TO});
c->points.push (hb_outline_point_t {to_x, to_y, hb_outline_point_t::type_t::CUBIC_TO});
}
static void
hb_outline_recording_pen_close_path (hb_draw_funcs_t *dfuncs HB_UNUSED,
void *data,
hb_draw_state_t *st,
void *user_data HB_UNUSED)
{
hb_outline_t *c = (hb_outline_t *) data;
c->contours.push (c->points.length);
}
static inline void free_static_outline_recording_pen_funcs ();
static struct hb_outline_recording_pen_funcs_lazy_loader_t : hb_draw_funcs_lazy_loader_t<hb_outline_recording_pen_funcs_lazy_loader_t>
{
static hb_draw_funcs_t *create ()
{
hb_draw_funcs_t *funcs = hb_draw_funcs_create ();
hb_draw_funcs_set_move_to_func (funcs, hb_outline_recording_pen_move_to, nullptr, nullptr);
hb_draw_funcs_set_line_to_func (funcs, hb_outline_recording_pen_line_to, nullptr, nullptr);
hb_draw_funcs_set_quadratic_to_func (funcs, hb_outline_recording_pen_quadratic_to, nullptr, nullptr);
hb_draw_funcs_set_cubic_to_func (funcs, hb_outline_recording_pen_cubic_to, nullptr, nullptr);
hb_draw_funcs_set_close_path_func (funcs, hb_outline_recording_pen_close_path, nullptr, nullptr);
hb_draw_funcs_make_immutable (funcs);
hb_atexit (free_static_outline_recording_pen_funcs);
return funcs;
}
} static_outline_recording_pen_funcs;
static inline
void free_static_outline_recording_pen_funcs ()
{
static_outline_recording_pen_funcs.free_instance ();
}
hb_draw_funcs_t *
hb_outline_recording_pen_get_funcs ()
{
return static_outline_recording_pen_funcs.get_unconst ();
}
#endif

83
src/hb-outline.hh Normal file
View File

@ -0,0 +1,83 @@
/*
* Copyright © 2023 Behdad Esfahbod
*
* 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.
*/
#ifndef HB_OUTLINE_HH
#define HB_OUTLINE_HH
#include "hb.hh"
#include "hb-draw.hh"
struct hb_outline_point_t
{
enum class type_t
{
MOVE_TO,
LINE_TO,
QUADRATIC_TO,
CUBIC_TO,
};
hb_outline_point_t (float x, float y, type_t type) :
x (x), y (y), type (type) {}
float x, y;
type_t type;
};
struct hb_outline_vector_t
{
float normalize_len ()
{
float len = hypotf (x, y);
if (len)
{
x /= len;
y /= len;
}
return len;
}
float x, y;
};
struct hb_outline_t
{
void reset () { points.shrink (0, false); contours.resize (0); }
HB_INTERNAL void replay (hb_draw_funcs_t *pen, void *pen_data) const;
HB_INTERNAL float area () const;
HB_INTERNAL void embolden (float x_strength, float y_strength,
float x_shift, float y_shift);
hb_vector_t<hb_outline_point_t> points;
hb_vector_t<unsigned> contours;
};
HB_INTERNAL hb_draw_funcs_t *
hb_outline_recording_pen_get_funcs ();
#endif /* HB_OUTLINE_HH */

3
src/hb-vector.hh
View File

@ -459,7 +459,7 @@ struct hb_vector_t
length--;
}
void shrink (int size_)
void shrink (int size_, bool shrink_memory = true)
{
unsigned int size = size_ < 0 ? 0u : (unsigned int) size_;
if (size >= length)
@ -467,6 +467,7 @@ struct hb_vector_t
shrink_vector (size);
if (shrink_memory)
alloc (size, true); /* To force shrinking memory if needed. */
}

2
src/meson.build
View File

@ -94,6 +94,8 @@ hb_base_sources = files(
'hb-ot-layout-gdef-table.hh',
'hb-ot-layout-gpos-table.hh',
'hb-ot-layout-gsub-table.hh',
'hb-outline.hh',
'hb-outline.cc',
'OT/Color/CBDT/CBDT.hh',
'OT/Color/COLR/COLR.hh',
'OT/Color/CPAL/CPAL.hh',

52
util/font-options.hh
View File

@ -63,6 +63,9 @@ struct font_options_t : face_options_t
int x_ppem = 0;
int y_ppem = 0;
double ptem = 0.;
double x_embolden = 0.;
double y_embolden = 0.;
hb_bool_t embolden_in_place = false;
double slant = 0.;
unsigned int subpixel_bits = SUBPIXEL_BITS;
mutable double font_size_x = DEFAULT_FONT_SIZE;
@ -101,6 +104,9 @@ font_options_t::post_parse (GError **error)
hb_font_set_ppem (font, x_ppem, y_ppem);
hb_font_set_ptem (font, ptem);
hb_font_set_synthetic_bold (font,
(float) x_embolden, (float) y_embolden,
embolden_in_place);
hb_font_set_synthetic_slant (font, slant);
int scale_x = (int) scalbnf (font_size_x, subpixel_bits);
@ -245,6 +251,46 @@ parse_font_ppem (const char *name G_GNUC_UNUSED,
}
}
static gboolean
parse_font_embolden (const char *name G_GNUC_UNUSED,
const char *arg,
gpointer data,
GError **error G_GNUC_UNUSED)
{
font_options_t *font_opts = (font_options_t *) data;
switch (sscanf (arg, "%lf%*[ ,]%lf", &font_opts->x_embolden, &font_opts->y_embolden)) {
case 1: font_opts->y_embolden = font_opts->x_embolden; HB_FALLTHROUGH;
case 2: return true;
default:
g_set_error (error, G_OPTION_ERROR, G_OPTION_ERROR_BAD_VALUE,
"%s argument should be one or two space-separated numbers",
name);
return false;
}
}
static gboolean
parse_font_bold (const char *name G_GNUC_UNUSED,
const char *arg,
gpointer data,
GError **error G_GNUC_UNUSED)
{
font_options_t *font_opts = (font_options_t *) data;
font_opts->embolden_in_place = false;
return parse_font_embolden ( name, arg, data, error);
}
static gboolean
parse_font_grade (const char *name G_GNUC_UNUSED,
const char *arg,
gpointer data,
GError **error G_GNUC_UNUSED)
{
font_options_t *font_opts = (font_options_t *) data;
font_opts->embolden_in_place = true;
return parse_font_embolden ( name, arg, data, error);
}
void
font_options_t::add_options (option_parser_t *parser)
{
@ -286,7 +332,11 @@ font_options_t::add_options (option_parser_t *parser)
G_OPTION_ARG_CALLBACK, (gpointer) &parse_font_ppem, "Set x,y pixels per EM (default: 0; disabled)", "1/2 integers"},
{"font-ptem", 0, font_size_flags,
G_OPTION_ARG_DOUBLE, &this->ptem, "Set font point-size (default: 0; disabled)", "point-size"},
{"font-slant", 0, 0,
{"font-bold", 0, font_size_flags,
G_OPTION_ARG_CALLBACK, (gpointer) &parse_font_bold, "Set synthetic bold (default: 0)", "1/2 numbers; eg. 0.05"},
{"font-grade", 0, font_size_flags,
G_OPTION_ARG_CALLBACK, (gpointer) &parse_font_grade, "Set synthetic grade (default: 0)", "1/2 numbers; eg. 0.05"},
{"font-slant", 0, font_size_flags,
G_OPTION_ARG_DOUBLE, &this->slant, "Set synthetic slant (default: 0)", "slant ratio; eg. 0.2"},
{"font-funcs", 0, 0, G_OPTION_ARG_STRING, &this->font_funcs, text, "impl"},
{"sub-font", 0, G_OPTION_FLAG_HIDDEN,