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[kern] Move kern machine to hb-kern.hh

This commit is contained in:
Behdad Esfahbod 2018-11-07 10:25:25 -05:00
parent a6acff252c
commit d0f8f4c200
5 changed files with 157 additions and 119 deletions
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1
src/Makefile.sources
View File

@ -16,6 +16,7 @@ HB_BASE_sources = \
hb-font.hh \
hb-font.cc \
hb-iter.hh \
hb-kern.hh \
hb-map.hh \
hb-map.cc \
hb-machinery.hh \

5
src/hb-aat-layout-kerx-table.hh
View File

@ -28,10 +28,7 @@
#ifndef HB_AAT_LAYOUT_KERX_TABLE_HH
#define HB_AAT_LAYOUT_KERX_TABLE_HH
#include "hb-open-type.hh"
#include "hb-aat-layout-common.hh"
#include "hb-ot-layout-gpos-table.hh"
#include "hb-ot-kern-table.hh"
#include "hb-kern.hh"
/*
* kerx -- Extended Kerning

153
src/hb-kern.hh Normal file
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@ -0,0 +1,153 @@
/*
* Copyright © 2017 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.
*
* Google Author(s): Behdad Esfahbod
*/
#ifndef HB_KERN_HH
#define HB_KERN_HH
#include "hb-open-type.hh"
#include "hb-aat-layout-common.hh"
#include "hb-ot-layout-gpos-table.hh"
namespace OT {
template <typename Driver>
struct hb_kern_machine_t
{
hb_kern_machine_t (const Driver &driver_) : driver (driver_) {}
HB_NO_SANITIZE_SIGNED_INTEGER_OVERFLOW
inline void kern (hb_font_t *font,
hb_buffer_t *buffer,
hb_mask_t kern_mask,
bool scale = true) const
{
OT::hb_ot_apply_context_t c (1, font, buffer);
c.set_lookup_mask (kern_mask);
c.set_lookup_props (OT::LookupFlag::IgnoreMarks);
OT::hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c.iter_input;
skippy_iter.init (&c);
bool horizontal = HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction);
unsigned int count = buffer->len;
hb_glyph_info_t *info = buffer->info;
hb_glyph_position_t *pos = buffer->pos;
for (unsigned int idx = 0; idx < count;)
{
if (!(info[idx].mask & kern_mask))
{
idx++;
continue;
}
skippy_iter.reset (idx, 1);
if (!skippy_iter.next ())
{
idx++;
continue;
}
unsigned int i = idx;
unsigned int j = skippy_iter.idx;
hb_position_t kern = driver.get_kerning (info[i].codepoint,
info[j].codepoint);
if (likely (!kern))
goto skip;
if (horizontal)
{
if (scale)
kern = font->em_scale_x (kern);
hb_position_t kern1 = kern >> 1;
hb_position_t kern2 = kern - kern1;
pos[i].x_advance += kern1;
pos[j].x_advance += kern2;
pos[j].x_offset += kern2;
}
else
{
if (scale)
kern = font->em_scale_y (kern);
hb_position_t kern1 = kern >> 1;
hb_position_t kern2 = kern - kern1;
pos[i].y_advance += kern1;
pos[j].y_advance += kern2;
pos[j].y_offset += kern2;
}
buffer->unsafe_to_break (i, j + 1);
skip:
idx = skippy_iter.idx;
}
}
const Driver &driver;
};
struct hb_glyph_pair_t
{
hb_codepoint_t left;
hb_codepoint_t right;
};
struct KernPair
{
inline int get_kerning (void) const
{ return value; }
inline int cmp (const hb_glyph_pair_t &o) const
{
int ret = left.cmp (o.left);
if (ret) return ret;
return right.cmp (o.right);
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
protected:
GlyphID left;
GlyphID right;
FWORD value;
public:
DEFINE_SIZE_STATIC (6);
};
} /* namespace OT */
#endif /* HB_KERN_HH */

115
src/hb-ot-kern-table.hh
View File

@ -27,89 +27,8 @@
#ifndef HB_OT_KERN_TABLE_HH
#define HB_OT_KERN_TABLE_HH
#include "hb-open-type.hh"
#include "hb-kern.hh"
#include "hb-ot-shape.hh"
#include "hb-ot-layout-gsubgpos.hh"
#include "hb-aat-layout-common.hh"
template <typename Driver>
struct hb_kern_machine_t
{
hb_kern_machine_t (const Driver &driver_) : driver (driver_) {}
HB_NO_SANITIZE_SIGNED_INTEGER_OVERFLOW
inline void kern (hb_font_t *font,
hb_buffer_t *buffer,
hb_mask_t kern_mask,
bool scale = true) const
{
OT::hb_ot_apply_context_t c (1, font, buffer);
c.set_lookup_mask (kern_mask);
c.set_lookup_props (OT::LookupFlag::IgnoreMarks);
OT::hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c.iter_input;
skippy_iter.init (&c);
bool horizontal = HB_DIRECTION_IS_HORIZONTAL (buffer->props.direction);
unsigned int count = buffer->len;
hb_glyph_info_t *info = buffer->info;
hb_glyph_position_t *pos = buffer->pos;
for (unsigned int idx = 0; idx < count;)
{
if (!(info[idx].mask & kern_mask))
{
idx++;
continue;
}
skippy_iter.reset (idx, 1);
if (!skippy_iter.next ())
{
idx++;
continue;
}
unsigned int i = idx;
unsigned int j = skippy_iter.idx;
hb_position_t kern = driver.get_kerning (info[i].codepoint,
info[j].codepoint);
if (likely (!kern))
goto skip;
if (horizontal)
{
if (scale)
kern = font->em_scale_x (kern);
hb_position_t kern1 = kern >> 1;
hb_position_t kern2 = kern - kern1;
pos[i].x_advance += kern1;
pos[j].x_advance += kern2;
pos[j].x_offset += kern2;
}
else
{
if (scale)
kern = font->em_scale_y (kern);
hb_position_t kern1 = kern >> 1;
hb_position_t kern2 = kern - kern1;
pos[i].y_advance += kern1;
pos[j].y_advance += kern2;
pos[j].y_offset += kern2;
}
buffer->unsafe_to_break (i, j + 1);
skip:
idx = skippy_iter.idx;
}
}
const Driver &driver;
};
/*
@ -123,38 +42,6 @@ struct hb_kern_machine_t
namespace OT {
struct hb_glyph_pair_t
{
hb_codepoint_t left;
hb_codepoint_t right;
};
struct KernPair
{
inline int get_kerning (void) const
{ return value; }
inline int cmp (const hb_glyph_pair_t &o) const
{
int ret = left.cmp (o.left);
if (ret) return ret;
return right.cmp (o.right);
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
protected:
GlyphID left;
GlyphID right;
FWORD value;
public:
DEFINE_SIZE_STATIC (6);
};
template <typename KernSubTableHeader>
struct KernSubTableFormat0
{

2
src/hb-ot-shape-fallback.cc
View File

@ -465,7 +465,7 @@ _hb_ot_shape_fallback_kern (const hb_ot_shape_plan_t *plan,
!font->has_glyph_v_kerning_func ())
return;
hb_ot_shape_fallback_kern_driver_t driver (font, buffer);
hb_kern_machine_t<hb_ot_shape_fallback_kern_driver_t> machine (driver);
OT::hb_kern_machine_t<hb_ot_shape_fallback_kern_driver_t> machine (driver);
machine.kern (font, buffer, plan->kern_mask, false);
}