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harfbuzz/src/hb-ot-layout-gpos-table.hh

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/*
* Copyright © 2007,2008,2009,2010 Red Hat, Inc.
* Copyright © 2010,2012 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_OT_LAYOUT_GPOS_TABLE_HH
#define HB_OT_LAYOUT_GPOS_TABLE_HH
#include "hb-ot-layout-gsubgpos-private.hh"
/* buffer **position** var allocations */
#define attach_lookback() var.u16[0] /* number of glyphs to go back to attach this glyph to its base */
#define cursive_chain() var.i16[1] /* character to which this connects, may be positive or negative */
/* Shared Tables: ValueRecord, Anchor Table, and MarkArray */
typedef USHORT Value;
typedef Value ValueRecord[VAR];
struct ValueFormat : USHORT
{
enum Flags {
xPlacement = 0x0001, /* Includes horizontal adjustment for placement */
yPlacement = 0x0002, /* Includes vertical adjustment for placement */
xAdvance = 0x0004, /* Includes horizontal adjustment for advance */
yAdvance = 0x0008, /* Includes vertical adjustment for advance */
xPlaDevice = 0x0010, /* Includes horizontal Device table for placement */
yPlaDevice = 0x0020, /* Includes vertical Device table for placement */
xAdvDevice = 0x0040, /* Includes horizontal Device table for advance */
yAdvDevice = 0x0080, /* Includes vertical Device table for advance */
ignored = 0x0F00, /* Was used in TrueType Open for MM fonts */
reserved = 0xF000, /* For future use */
devices = 0x00F0 /* Mask for having any Device table */
};
/* All fields are options. Only those available advance the value pointer. */
#if 0
SHORT xPlacement; /* Horizontal adjustment for
* placement--in design units */
SHORT yPlacement; /* Vertical adjustment for
* placement--in design units */
SHORT xAdvance; /* Horizontal adjustment for
* advance--in design units (only used
* for horizontal writing) */
SHORT yAdvance; /* Vertical adjustment for advance--in
* design units (only used for vertical
* writing) */
Offset xPlaDevice; /* Offset to Device table for
* horizontal placement--measured from
* beginning of PosTable (may be NULL) */
Offset yPlaDevice; /* Offset to Device table for vertical
* placement--measured from beginning
* of PosTable (may be NULL) */
Offset xAdvDevice; /* Offset to Device table for
* horizontal advance--measured from
* beginning of PosTable (may be NULL) */
Offset yAdvDevice; /* Offset to Device table for vertical
* advance--measured from beginning of
* PosTable (may be NULL) */
#endif
inline unsigned int get_len (void) const
{ return _hb_popcount32 ((unsigned int) *this); }
inline unsigned int get_size (void) const
{ return get_len () * Value::static_size; }
void apply_value (hb_font_t *font,
hb_direction_t direction,
const void *base,
const Value *values,
hb_glyph_position_t &glyph_pos) const
{
unsigned int x_ppem, y_ppem;
unsigned int format = *this;
hb_bool_t horizontal = HB_DIRECTION_IS_HORIZONTAL (direction);
if (!format) return;
if (format & xPlacement) glyph_pos.x_offset += font->em_scale_x (get_short (values++));
if (format & yPlacement) glyph_pos.y_offset += font->em_scale_y (get_short (values++));
if (format & xAdvance) {
if (likely (horizontal)) glyph_pos.x_advance += font->em_scale_x (get_short (values++)); else values++;
}
/* y_advance values grow downward but font-space grows upward, hence negation */
if (format & yAdvance) {
if (unlikely (!horizontal)) glyph_pos.y_advance -= font->em_scale_y (get_short (values++)); else values++;
}
if (!has_device ()) return;
x_ppem = font->x_ppem;
y_ppem = font->y_ppem;
if (!x_ppem && !y_ppem) return;
/* pixel -> fractional pixel */
if (format & xPlaDevice) {
if (x_ppem) glyph_pos.x_offset += (base + get_device (values++)).get_x_delta (font); else values++;
}
if (format & yPlaDevice) {
if (y_ppem) glyph_pos.y_offset += (base + get_device (values++)).get_y_delta (font); else values++;
}
if (format & xAdvDevice) {
if (horizontal && x_ppem) glyph_pos.x_advance += (base + get_device (values++)).get_x_delta (font); else values++;
}
if (format & yAdvDevice) {
/* y_advance values grow downward but font-space grows upward, hence negation */
if (!horizontal && y_ppem) glyph_pos.y_advance -= (base + get_device (values++)).get_y_delta (font); else values++;
}
}
private:
inline bool sanitize_value_devices (hb_sanitize_context_t *c, void *base, Value *values) {
unsigned int format = *this;
if (format & xPlacement) values++;
if (format & yPlacement) values++;
if (format & xAdvance) values++;
if (format & yAdvance) values++;
if ((format & xPlaDevice) && !get_device (values++).sanitize (c, base)) return false;
if ((format & yPlaDevice) && !get_device (values++).sanitize (c, base)) return false;
if ((format & xAdvDevice) && !get_device (values++).sanitize (c, base)) return false;
if ((format & yAdvDevice) && !get_device (values++).sanitize (c, base)) return false;
return true;
}
static inline OffsetTo<Device>& get_device (Value* value)
{ return *CastP<OffsetTo<Device> > (value); }
static inline const OffsetTo<Device>& get_device (const Value* value)
{ return *CastP<OffsetTo<Device> > (value); }
static inline const SHORT& get_short (const Value* value)
{ return *CastP<SHORT> (value); }
public:
inline bool has_device (void) const {
unsigned int format = *this;
return (format & devices) != 0;
}
inline bool sanitize_value (hb_sanitize_context_t *c, void *base, Value *values) {
TRACE_SANITIZE ();
return TRACE_RETURN (c->check_range (values, get_size ()) && (!has_device () || sanitize_value_devices (c, base, values)));
}
inline bool sanitize_values (hb_sanitize_context_t *c, void *base, Value *values, unsigned int count) {
TRACE_SANITIZE ();
unsigned int len = get_len ();
if (!c->check_array (values, get_size (), count)) return TRACE_RETURN (false);
if (!has_device ()) return TRACE_RETURN (true);
for (unsigned int i = 0; i < count; i++) {
if (!sanitize_value_devices (c, base, values))
return TRACE_RETURN (false);
values += len;
}
return TRACE_RETURN (true);
}
/* Just sanitize referenced Device tables. Doesn't check the values themselves. */
inline bool sanitize_values_stride_unsafe (hb_sanitize_context_t *c, void *base, Value *values, unsigned int count, unsigned int stride) {
TRACE_SANITIZE ();
if (!has_device ()) return TRACE_RETURN (true);
for (unsigned int i = 0; i < count; i++) {
if (!sanitize_value_devices (c, base, values))
return TRACE_RETURN (false);
values += stride;
}
return TRACE_RETURN (true);
}
};
struct AnchorFormat1
{
friend struct Anchor;
private:
inline void get_anchor (hb_font_t *font, hb_codepoint_t glyph_id HB_UNUSED,
hb_position_t *x, hb_position_t *y) const
{
*x = font->em_scale_x (xCoordinate);
*y = font->em_scale_y (yCoordinate);
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
return TRACE_RETURN (c->check_struct (this));
}
private:
USHORT format; /* Format identifier--format = 1 */
SHORT xCoordinate; /* Horizontal value--in design units */
SHORT yCoordinate; /* Vertical value--in design units */
public:
DEFINE_SIZE_STATIC (6);
};
struct AnchorFormat2
{
friend struct Anchor;
private:
inline void get_anchor (hb_font_t *font, hb_codepoint_t glyph_id,
hb_position_t *x, hb_position_t *y) const
{
unsigned int x_ppem = font->x_ppem;
unsigned int y_ppem = font->y_ppem;
hb_position_t cx, cy;
hb_bool_t ret = false;
if (x_ppem || y_ppem)
ret = hb_font_get_glyph_contour_point_for_origin (font, glyph_id, anchorPoint, HB_DIRECTION_LTR, &cx, &cy);
*x = x_ppem && ret ? cx : font->em_scale_x (xCoordinate);
*y = y_ppem && ret ? cy : font->em_scale_y (yCoordinate);
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
return TRACE_RETURN (c->check_struct (this));
}
private:
USHORT format; /* Format identifier--format = 2 */
SHORT xCoordinate; /* Horizontal value--in design units */
SHORT yCoordinate; /* Vertical value--in design units */
USHORT anchorPoint; /* Index to glyph contour point */
public:
DEFINE_SIZE_STATIC (8);
};
struct AnchorFormat3
{
friend struct Anchor;
private:
inline void get_anchor (hb_font_t *font, hb_codepoint_t glyph_id HB_UNUSED,
hb_position_t *x, hb_position_t *y) const
{
*x = font->em_scale_x (xCoordinate);
*y = font->em_scale_y (yCoordinate);
if (font->x_ppem)
*x += (this+xDeviceTable).get_x_delta (font);
if (font->y_ppem)
*y += (this+yDeviceTable).get_x_delta (font);
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
return TRACE_RETURN (c->check_struct (this) && xDeviceTable.sanitize (c, this) && yDeviceTable.sanitize (c, this));
}
private:
USHORT format; /* Format identifier--format = 3 */
SHORT xCoordinate; /* Horizontal value--in design units */
SHORT yCoordinate; /* Vertical value--in design units */
OffsetTo<Device>
xDeviceTable; /* Offset to Device table for X
* coordinate-- from beginning of
* Anchor table (may be NULL) */
OffsetTo<Device>
yDeviceTable; /* Offset to Device table for Y
* coordinate-- from beginning of
* Anchor table (may be NULL) */
public:
DEFINE_SIZE_STATIC (10);
};
struct Anchor
{
inline void get_anchor (hb_font_t *font, hb_codepoint_t glyph_id,
hb_position_t *x, hb_position_t *y) const
{
*x = *y = 0;
switch (u.format) {
case 1: u.format1.get_anchor (font, glyph_id, x, y); return;
case 2: u.format2.get_anchor (font, glyph_id, x, y); return;
case 3: u.format3.get_anchor (font, glyph_id, x, y); return;
default: return;
}
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.sanitize (c));
case 2: return TRACE_RETURN (u.format2.sanitize (c));
case 3: return TRACE_RETURN (u.format3.sanitize (c));
default:return TRACE_RETURN (true);
}
}
private:
union {
USHORT format; /* Format identifier */
AnchorFormat1 format1;
AnchorFormat2 format2;
AnchorFormat3 format3;
} u;
public:
DEFINE_SIZE_UNION (2, format);
};
struct AnchorMatrix
{
inline const Anchor& get_anchor (unsigned int row, unsigned int col, unsigned int cols) const {
if (unlikely (row >= rows || col >= cols)) return Null(Anchor);
return this+matrix[row * cols + col];
}
inline bool sanitize (hb_sanitize_context_t *c, unsigned int cols) {
TRACE_SANITIZE ();
if (!c->check_struct (this)) return TRACE_RETURN (false);
if (unlikely (rows > 0 && cols >= ((unsigned int) -1) / rows)) return TRACE_RETURN (false);
unsigned int count = rows * cols;
if (!c->check_array (matrix, matrix[0].static_size, count)) return TRACE_RETURN (false);
for (unsigned int i = 0; i < count; i++)
if (!matrix[i].sanitize (c, this)) return TRACE_RETURN (false);
return TRACE_RETURN (true);
}
USHORT rows; /* Number of rows */
private:
OffsetTo<Anchor>
matrix[VAR]; /* Matrix of offsets to Anchor tables--
* from beginning of AnchorMatrix table */
public:
DEFINE_SIZE_ARRAY (2, matrix);
};
struct MarkRecord
{
friend struct MarkArray;
inline bool sanitize (hb_sanitize_context_t *c, void *base) {
TRACE_SANITIZE ();
return TRACE_RETURN (c->check_struct (this) && markAnchor.sanitize (c, base));
}
private:
USHORT klass; /* Class defined for this mark */
OffsetTo<Anchor>
markAnchor; /* Offset to Anchor table--from
* beginning of MarkArray table */
public:
DEFINE_SIZE_STATIC (4);
};
struct MarkArray : ArrayOf<MarkRecord> /* Array of MarkRecords--in Coverage order */
{
inline bool apply (hb_apply_context_t *c,
unsigned int mark_index, unsigned int glyph_index,
const AnchorMatrix &anchors, unsigned int class_count,
unsigned int glyph_pos) const
{
TRACE_APPLY ();
const MarkRecord &record = ArrayOf<MarkRecord>::operator[](mark_index);
unsigned int mark_class = record.klass;
const Anchor& mark_anchor = this + record.markAnchor;
const Anchor& glyph_anchor = anchors.get_anchor (glyph_index, mark_class, class_count);
hb_position_t mark_x, mark_y, base_x, base_y;
mark_anchor.get_anchor (c->font, c->buffer->cur().codepoint, &mark_x, &mark_y);
glyph_anchor.get_anchor (c->font, c->buffer->info[glyph_pos].codepoint, &base_x, &base_y);
hb_glyph_position_t &o = c->buffer->cur_pos();
o.x_offset = base_x - mark_x;
o.y_offset = base_y - mark_y;
o.attach_lookback() = c->buffer->idx - glyph_pos;
c->buffer->idx++;
return TRACE_RETURN (true);
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
return TRACE_RETURN (ArrayOf<MarkRecord>::sanitize (c, this));
}
};
/* Lookups */
struct SinglePosFormat1
{
friend struct SinglePos;
private:
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY ();
unsigned int index = (this+coverage) (c->buffer->cur().codepoint);
if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
valueFormat.apply_value (c->font, c->direction, this,
values, c->buffer->cur_pos());
c->buffer->idx++;
return TRACE_RETURN (true);
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
return TRACE_RETURN (c->check_struct (this) && coverage.sanitize (c, this) && valueFormat.sanitize_value (c, this, values));
}
private:
USHORT format; /* Format identifier--format = 1 */
OffsetTo<Coverage>
coverage; /* Offset to Coverage table--from
* beginning of subtable */
ValueFormat valueFormat; /* Defines the types of data in the
* ValueRecord */
ValueRecord values; /* Defines positioning
* value(s)--applied to all glyphs in
* the Coverage table */
public:
DEFINE_SIZE_ARRAY (6, values);
};
struct SinglePosFormat2
{
friend struct SinglePos;
private:
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY ();
unsigned int index = (this+coverage) (c->buffer->cur().codepoint);
if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
if (likely (index >= valueCount)) return TRACE_RETURN (false);
valueFormat.apply_value (c->font, c->direction, this,
&values[index * valueFormat.get_len ()],
c->buffer->cur_pos());
c->buffer->idx++;
return TRACE_RETURN (true);
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
return TRACE_RETURN (c->check_struct (this) && coverage.sanitize (c, this) && valueFormat.sanitize_values (c, this, values, valueCount));
}
private:
USHORT format; /* Format identifier--format = 2 */
OffsetTo<Coverage>
coverage; /* Offset to Coverage table--from
* beginning of subtable */
ValueFormat valueFormat; /* Defines the types of data in the
* ValueRecord */
USHORT valueCount; /* Number of ValueRecords */
ValueRecord values; /* Array of ValueRecords--positioning
* values applied to glyphs */
public:
DEFINE_SIZE_ARRAY (8, values);
};
struct SinglePos
{
friend struct PosLookupSubTable;
private:
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY ();
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.apply (c));
case 2: return TRACE_RETURN (u.format2.apply (c));
default:return TRACE_RETURN (false);
}
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.sanitize (c));
case 2: return TRACE_RETURN (u.format2.sanitize (c));
default:return TRACE_RETURN (true);
}
}
private:
union {
USHORT format; /* Format identifier */
SinglePosFormat1 format1;
SinglePosFormat2 format2;
} u;
};
struct PairValueRecord
{
friend struct PairSet;
private:
GlyphID secondGlyph; /* GlyphID of second glyph in the
* pair--first glyph is listed in the
* Coverage table */
ValueRecord values; /* Positioning data for the first glyph
* followed by for second glyph */
public:
DEFINE_SIZE_ARRAY (2, values);
};
struct PairSet
{
friend struct PairPosFormat1;
inline bool apply (hb_apply_context_t *c,
const ValueFormat *valueFormats,
unsigned int pos) const
{
TRACE_APPLY ();
unsigned int len1 = valueFormats[0].get_len ();
unsigned int len2 = valueFormats[1].get_len ();
unsigned int record_size = USHORT::static_size * (1 + len1 + len2);
unsigned int count = len;
const PairValueRecord *record = CastP<PairValueRecord> (array);
for (unsigned int i = 0; i < count; i++)
{
if (c->buffer->info[pos].codepoint == record->secondGlyph)
{
valueFormats[0].apply_value (c->font, c->direction, this,
&record->values[0], c->buffer->cur_pos());
valueFormats[1].apply_value (c->font, c->direction, this,
&record->values[len1], c->buffer->pos[pos]);
if (len2)
pos++;
c->buffer->idx = pos;
return TRACE_RETURN (true);
}
record = &StructAtOffset<PairValueRecord> (record, record_size);
}
return TRACE_RETURN (false);
}
struct sanitize_closure_t {
void *base;
ValueFormat *valueFormats;
unsigned int len1; /* valueFormats[0].get_len() */
unsigned int stride; /* 1 + len1 + len2 */
};
inline bool sanitize (hb_sanitize_context_t *c, const sanitize_closure_t *closure) {
TRACE_SANITIZE ();
if (!(c->check_struct (this)
&& c->check_array (array, USHORT::static_size * closure->stride, len))) return TRACE_RETURN (false);
unsigned int count = len;
PairValueRecord *record = CastP<PairValueRecord> (array);
return TRACE_RETURN (closure->valueFormats[0].sanitize_values_stride_unsafe (c, closure->base, &record->values[0], count, closure->stride)
&& closure->valueFormats[1].sanitize_values_stride_unsafe (c, closure->base, &record->values[closure->len1], count, closure->stride));
}
private:
USHORT len; /* Number of PairValueRecords */
USHORT array[VAR]; /* Array of PairValueRecords--ordered
* by GlyphID of the second glyph */
public:
DEFINE_SIZE_ARRAY (2, array);
};
struct PairPosFormat1
{
friend struct PairPos;
private:
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY ();
hb_apply_context_t::mark_skipping_forward_iterator_t skippy_iter (c, c->buffer->idx, 1);
if (skippy_iter.has_no_chance ()) return TRACE_RETURN (false);
unsigned int index = (this+coverage) (c->buffer->cur().codepoint);
if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
if (!skippy_iter.next ()) return TRACE_RETURN (false);
return TRACE_RETURN ((this+pairSet[index]).apply (c, &valueFormat1, skippy_iter.idx));
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
unsigned int len1 = valueFormat1.get_len ();
unsigned int len2 = valueFormat2.get_len ();
PairSet::sanitize_closure_t closure = {
this,
&valueFormat1,
len1,
1 + len1 + len2
};
return TRACE_RETURN (c->check_struct (this) && coverage.sanitize (c, this) && pairSet.sanitize (c, this, &closure));
}
private:
USHORT format; /* Format identifier--format = 1 */
OffsetTo<Coverage>
coverage; /* Offset to Coverage table--from
* beginning of subtable */
ValueFormat valueFormat1; /* Defines the types of data in
* ValueRecord1--for the first glyph
* in the pair--may be zero (0) */
ValueFormat valueFormat2; /* Defines the types of data in
* ValueRecord2--for the second glyph
* in the pair--may be zero (0) */
OffsetArrayOf<PairSet>
pairSet; /* Array of PairSet tables
* ordered by Coverage Index */
public:
DEFINE_SIZE_ARRAY (10, pairSet);
};
struct PairPosFormat2
{
friend struct PairPos;
private:
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY ();
hb_apply_context_t::mark_skipping_forward_iterator_t skippy_iter (c, c->buffer->idx, 1);
if (skippy_iter.has_no_chance ()) return TRACE_RETURN (false);
unsigned int index = (this+coverage) (c->buffer->cur().codepoint);
if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
if (!skippy_iter.next ()) return TRACE_RETURN (false);
unsigned int len1 = valueFormat1.get_len ();
unsigned int len2 = valueFormat2.get_len ();
unsigned int record_len = len1 + len2;
unsigned int klass1 = (this+classDef1) (c->buffer->cur().codepoint);
unsigned int klass2 = (this+classDef2) (c->buffer->info[skippy_iter.idx].codepoint);
if (unlikely (klass1 >= class1Count || klass2 >= class2Count)) return TRACE_RETURN (false);
const Value *v = &values[record_len * (klass1 * class2Count + klass2)];
valueFormat1.apply_value (c->font, c->direction, this,
v, c->buffer->cur_pos());
valueFormat2.apply_value (c->font, c->direction, this,
v + len1, c->buffer->pos[skippy_iter.idx]);
c->buffer->idx = skippy_iter.idx;
if (len2)
c->buffer->idx++;
return TRACE_RETURN (true);
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
if (!(c->check_struct (this)
&& coverage.sanitize (c, this)
&& classDef1.sanitize (c, this)
&& classDef2.sanitize (c, this))) return TRACE_RETURN (false);
unsigned int len1 = valueFormat1.get_len ();
unsigned int len2 = valueFormat2.get_len ();
unsigned int stride = len1 + len2;
unsigned int record_size = valueFormat1.get_size () + valueFormat2.get_size ();
unsigned int count = (unsigned int) class1Count * (unsigned int) class2Count;
return TRACE_RETURN (c->check_array (values, record_size, count) &&
valueFormat1.sanitize_values_stride_unsafe (c, this, &values[0], count, stride) &&
valueFormat2.sanitize_values_stride_unsafe (c, this, &values[len1], count, stride));
}
private:
USHORT format; /* Format identifier--format = 2 */
OffsetTo<Coverage>
coverage; /* Offset to Coverage table--from
* beginning of subtable */
ValueFormat valueFormat1; /* ValueRecord definition--for the
* first glyph of the pair--may be zero
* (0) */
ValueFormat valueFormat2; /* ValueRecord definition--for the
* second glyph of the pair--may be
* zero (0) */
OffsetTo<ClassDef>
classDef1; /* Offset to ClassDef table--from
* beginning of PairPos subtable--for
* the first glyph of the pair */
OffsetTo<ClassDef>
classDef2; /* Offset to ClassDef table--from
* beginning of PairPos subtable--for
* the second glyph of the pair */
USHORT class1Count; /* Number of classes in ClassDef1
* table--includes Class0 */
USHORT class2Count; /* Number of classes in ClassDef2
* table--includes Class0 */
ValueRecord values; /* Matrix of value pairs:
* class1-major, class2-minor,
* Each entry has value1 and value2 */
public:
DEFINE_SIZE_ARRAY (16, values);
};
struct PairPos
{
friend struct PosLookupSubTable;
private:
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY ();
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.apply (c));
case 2: return TRACE_RETURN (u.format2.apply (c));
default:return TRACE_RETURN (false);
}
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.sanitize (c));
case 2: return TRACE_RETURN (u.format2.sanitize (c));
default:return TRACE_RETURN (true);
}
}
private:
union {
USHORT format; /* Format identifier */
PairPosFormat1 format1;
PairPosFormat2 format2;
} u;
};
struct EntryExitRecord
{
friend struct CursivePosFormat1;
inline bool sanitize (hb_sanitize_context_t *c, void *base) {
TRACE_SANITIZE ();
return TRACE_RETURN (entryAnchor.sanitize (c, base) && exitAnchor.sanitize (c, base));
}
private:
OffsetTo<Anchor>
entryAnchor; /* Offset to EntryAnchor table--from
* beginning of CursivePos
* subtable--may be NULL */
OffsetTo<Anchor>
exitAnchor; /* Offset to ExitAnchor table--from
* beginning of CursivePos
* subtable--may be NULL */
public:
DEFINE_SIZE_STATIC (4);
};
struct CursivePosFormat1
{
friend struct CursivePos;
private:
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY ();
/* We don't handle mark glyphs here. */
if (c->property & HB_OT_LAYOUT_GLYPH_CLASS_MARK) return TRACE_RETURN (false);
hb_apply_context_t::mark_skipping_forward_iterator_t skippy_iter (c, c->buffer->idx, 1);
if (skippy_iter.has_no_chance ()) return TRACE_RETURN (false);
const EntryExitRecord &this_record = entryExitRecord[(this+coverage) (c->buffer->cur().codepoint)];
if (!this_record.exitAnchor) return TRACE_RETURN (false);
if (!skippy_iter.next ()) return TRACE_RETURN (false);
const EntryExitRecord &next_record = entryExitRecord[(this+coverage) (c->buffer->info[skippy_iter.idx].codepoint)];
if (!next_record.entryAnchor) return TRACE_RETURN (false);
unsigned int i = c->buffer->idx;
unsigned int j = skippy_iter.idx;
hb_position_t entry_x, entry_y, exit_x, exit_y;
(this+this_record.exitAnchor).get_anchor (c->font, c->buffer->info[i].codepoint, &exit_x, &exit_y);
(this+next_record.entryAnchor).get_anchor (c->font, c->buffer->info[j].codepoint, &entry_x, &entry_y);
hb_glyph_position_t *pos = c->buffer->pos;
hb_position_t d;
/* Main-direction adjustment */
switch (c->direction) {
case HB_DIRECTION_LTR:
pos[i].x_advance = exit_x + pos[i].x_offset;
d = entry_x + pos[j].x_offset;
pos[j].x_advance -= d;
pos[j].x_offset -= d;
break;
case HB_DIRECTION_RTL:
d = exit_x + pos[i].x_offset;
pos[i].x_advance -= d;
pos[i].x_offset -= d;
pos[j].x_advance = entry_x + pos[j].x_offset;
break;
case HB_DIRECTION_TTB:
pos[i].y_advance = exit_y + pos[i].y_offset;
d = entry_y + pos[j].y_offset;
pos[j].y_advance -= d;
pos[j].y_offset -= d;
break;
case HB_DIRECTION_BTT:
d = exit_y + pos[i].y_offset;
pos[i].y_advance -= d;
pos[i].y_offset -= d;
pos[j].y_advance = entry_y;
break;
case HB_DIRECTION_INVALID:
default:
break;
}
/* Cross-direction adjustment */
if (c->lookup_props & LookupFlag::RightToLeft) {
pos[i].cursive_chain() = j - i;
if (likely (HB_DIRECTION_IS_HORIZONTAL (c->direction)))
pos[i].y_offset = entry_y - exit_y;
else
pos[i].x_offset = entry_x - exit_x;
} else {
pos[j].cursive_chain() = i - j;
if (likely (HB_DIRECTION_IS_HORIZONTAL (c->direction)))
pos[j].y_offset = exit_y - entry_y;
else
pos[j].x_offset = exit_x - entry_x;
}
c->buffer->idx = j;
return TRACE_RETURN (true);
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
return TRACE_RETURN (coverage.sanitize (c, this) && entryExitRecord.sanitize (c, this));
}
private:
USHORT format; /* Format identifier--format = 1 */
OffsetTo<Coverage>
coverage; /* Offset to Coverage table--from
* beginning of subtable */
ArrayOf<EntryExitRecord>
entryExitRecord; /* Array of EntryExit records--in
* Coverage Index order */
public:
DEFINE_SIZE_ARRAY (6, entryExitRecord);
};
struct CursivePos
{
friend struct PosLookupSubTable;
private:
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY ();
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.apply (c));
default:return TRACE_RETURN (false);
}
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.sanitize (c));
default:return TRACE_RETURN (true);
}
}
private:
union {
USHORT format; /* Format identifier */
CursivePosFormat1 format1;
} u;
};
typedef AnchorMatrix BaseArray; /* base-major--
* in order of BaseCoverage Index--,
* mark-minor--
* ordered by class--zero-based. */
struct MarkBasePosFormat1
{
friend struct MarkBasePos;
private:
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY ();
unsigned int mark_index = (this+markCoverage) (c->buffer->cur().codepoint);
if (likely (mark_index == NOT_COVERED)) return TRACE_RETURN (false);
/* now we search backwards for a non-mark glyph */
unsigned int property;
hb_apply_context_t::mark_skipping_backward_iterator_t skippy_iter (c, c->buffer->idx, 1);
do {
if (!skippy_iter.prev (&property, LookupFlag::IgnoreMarks)) return TRACE_RETURN (false);
/* We only want to attach to the first of a MultipleSubst sequence. Reject others. */
if (0 == get_lig_comp (c->buffer->info[skippy_iter.idx])) break;
skippy_iter.reject ();
} while (1);
/* The following assertion is too strong, so we've disabled it. */
if (!(property & HB_OT_LAYOUT_GLYPH_CLASS_BASE_GLYPH)) {/*return TRACE_RETURN (false);*/}
unsigned int base_index = (this+baseCoverage) (c->buffer->info[skippy_iter.idx].codepoint);
if (base_index == NOT_COVERED) return TRACE_RETURN (false);
return TRACE_RETURN ((this+markArray).apply (c, mark_index, base_index, this+baseArray, classCount, skippy_iter.idx));
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
return TRACE_RETURN (c->check_struct (this) && markCoverage.sanitize (c, this) && baseCoverage.sanitize (c, this) &&
markArray.sanitize (c, this) && baseArray.sanitize (c, this, (unsigned int) classCount));
}
private:
USHORT format; /* Format identifier--format = 1 */
OffsetTo<Coverage>
markCoverage; /* Offset to MarkCoverage table--from
* beginning of MarkBasePos subtable */
OffsetTo<Coverage>
baseCoverage; /* Offset to BaseCoverage table--from
* beginning of MarkBasePos subtable */
USHORT classCount; /* Number of classes defined for marks */
OffsetTo<MarkArray>
markArray; /* Offset to MarkArray table--from
* beginning of MarkBasePos subtable */
OffsetTo<BaseArray>
baseArray; /* Offset to BaseArray table--from
* beginning of MarkBasePos subtable */
public:
DEFINE_SIZE_STATIC (12);
};
struct MarkBasePos
{
friend struct PosLookupSubTable;
private:
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY ();
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.apply (c));
default:return TRACE_RETURN (false);
}
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.sanitize (c));
default:return TRACE_RETURN (true);
}
}
private:
union {
USHORT format; /* Format identifier */
MarkBasePosFormat1 format1;
} u;
};
typedef AnchorMatrix LigatureAttach; /* component-major--
* in order of writing direction--,
* mark-minor--
* ordered by class--zero-based. */
typedef OffsetListOf<LigatureAttach> LigatureArray;
/* Array of LigatureAttach
* tables ordered by
* LigatureCoverage Index */
struct MarkLigPosFormat1
{
friend struct MarkLigPos;
private:
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY ();
unsigned int mark_index = (this+markCoverage) (c->buffer->cur().codepoint);
if (likely (mark_index == NOT_COVERED)) return TRACE_RETURN (false);
/* now we search backwards for a non-mark glyph */
unsigned int property;
hb_apply_context_t::mark_skipping_backward_iterator_t skippy_iter (c, c->buffer->idx, 1);
if (!skippy_iter.prev (&property, LookupFlag::IgnoreMarks)) return TRACE_RETURN (false);
/* The following assertion is too strong, so we've disabled it. */
if (!(property & HB_OT_LAYOUT_GLYPH_CLASS_LIGATURE)) {/*return TRACE_RETURN (false);*/}
unsigned int j = skippy_iter.idx;
unsigned int lig_index = (this+ligatureCoverage) (c->buffer->info[j].codepoint);
if (lig_index == NOT_COVERED) return TRACE_RETURN (false);
const LigatureArray& lig_array = this+ligatureArray;
const LigatureAttach& lig_attach = lig_array[lig_index];
/* Find component to attach to */
unsigned int comp_count = lig_attach.rows;
if (unlikely (!comp_count)) return TRACE_RETURN (false);
unsigned int comp_index;
/* We must now check whether the ligature ID of the current mark glyph
* is identical to the ligature ID of the found ligature. If yes, we
* can directly use the component index. If not, we attach the mark
* glyph to the last component of the ligature. */
if (get_lig_id (c->buffer->info[j]) &&
get_lig_id (c->buffer->info[j]) == get_lig_id (c->buffer->cur()) &&
get_lig_comp (c->buffer->cur()) > 0)
{
comp_index = get_lig_comp (c->buffer->cur()) - 1;
if (comp_index >= comp_count)
comp_index = comp_count - 1;
}
else
comp_index = comp_count - 1;
return TRACE_RETURN ((this+markArray).apply (c, mark_index, comp_index, lig_attach, classCount, j));
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
return TRACE_RETURN (c->check_struct (this) && markCoverage.sanitize (c, this) && ligatureCoverage.sanitize (c, this) &&
markArray.sanitize (c, this) && ligatureArray.sanitize (c, this, (unsigned int) classCount));
}
private:
USHORT format; /* Format identifier--format = 1 */
OffsetTo<Coverage>
markCoverage; /* Offset to Mark Coverage table--from
* beginning of MarkLigPos subtable */
OffsetTo<Coverage>
ligatureCoverage; /* Offset to Ligature Coverage
* table--from beginning of MarkLigPos
* subtable */
USHORT classCount; /* Number of defined mark classes */
OffsetTo<MarkArray>
markArray; /* Offset to MarkArray table--from
* beginning of MarkLigPos subtable */
OffsetTo<LigatureArray>
ligatureArray; /* Offset to LigatureArray table--from
* beginning of MarkLigPos subtable */
public:
DEFINE_SIZE_STATIC (12);
};
struct MarkLigPos
{
friend struct PosLookupSubTable;
private:
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY ();
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.apply (c));
default:return TRACE_RETURN (false);
}
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.sanitize (c));
default:return TRACE_RETURN (true);
}
}
private:
union {
USHORT format; /* Format identifier */
MarkLigPosFormat1 format1;
} u;
};
typedef AnchorMatrix Mark2Array; /* mark2-major--
* in order of Mark2Coverage Index--,
* mark1-minor--
* ordered by class--zero-based. */
struct MarkMarkPosFormat1
{
friend struct MarkMarkPos;
private:
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY ();
unsigned int mark1_index = (this+mark1Coverage) (c->buffer->cur().codepoint);
if (likely (mark1_index == NOT_COVERED)) return TRACE_RETURN (false);
/* now we search backwards for a suitable mark glyph until a non-mark glyph */
unsigned int property;
hb_apply_context_t::mark_skipping_backward_iterator_t skippy_iter (c, c->buffer->idx, 1);
if (!skippy_iter.prev (&property)) return TRACE_RETURN (false);
if (!(property & HB_OT_LAYOUT_GLYPH_CLASS_MARK)) return TRACE_RETURN (false);
unsigned int j = skippy_iter.idx;
/* Two marks match only if they belong to the same base, or same component
* of the same ligature. That is, the component numbers must match, and
* if those are non-zero, the ligid number should also match. */
if ((get_lig_comp (c->buffer->info[j]) != get_lig_comp (c->buffer->cur())) ||
(get_lig_comp (c->buffer->info[j]) > 0 &&
get_lig_id (c->buffer->info[j]) != get_lig_id (c->buffer->cur())))
return TRACE_RETURN (false);
unsigned int mark2_index = (this+mark2Coverage) (c->buffer->info[j].codepoint);
if (mark2_index == NOT_COVERED) return TRACE_RETURN (false);
return TRACE_RETURN ((this+mark1Array).apply (c, mark1_index, mark2_index, this+mark2Array, classCount, j));
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
return TRACE_RETURN (c->check_struct (this) && mark1Coverage.sanitize (c, this) &&
mark2Coverage.sanitize (c, this) && mark1Array.sanitize (c, this)
&& mark2Array.sanitize (c, this, (unsigned int) classCount));
}
private:
USHORT format; /* Format identifier--format = 1 */
OffsetTo<Coverage>
mark1Coverage; /* Offset to Combining Mark1 Coverage
* table--from beginning of MarkMarkPos
* subtable */
OffsetTo<Coverage>
mark2Coverage; /* Offset to Combining Mark2 Coverage
* table--from beginning of MarkMarkPos
* subtable */
USHORT classCount; /* Number of defined mark classes */
OffsetTo<MarkArray>
mark1Array; /* Offset to Mark1Array table--from
* beginning of MarkMarkPos subtable */
OffsetTo<Mark2Array>
mark2Array; /* Offset to Mark2Array table--from
* beginning of MarkMarkPos subtable */
public:
DEFINE_SIZE_STATIC (12);
};
struct MarkMarkPos
{
friend struct PosLookupSubTable;
private:
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY ();
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.apply (c));
default:return TRACE_RETURN (false);
}
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
switch (u.format) {
case 1: return TRACE_RETURN (u.format1.sanitize (c));
default:return TRACE_RETURN (true);
}
}
private:
union {
USHORT format; /* Format identifier */
MarkMarkPosFormat1 format1;
} u;
};
static inline bool position_lookup (hb_apply_context_t *c, unsigned int lookup_index);
struct ContextPos : Context
{
friend struct PosLookupSubTable;
private:
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY ();
return TRACE_RETURN (Context::apply (c, position_lookup));
}
};
struct ChainContextPos : ChainContext
{
friend struct PosLookupSubTable;
private:
inline bool apply (hb_apply_context_t *c) const
{
TRACE_APPLY ();
return TRACE_RETURN (ChainContext::apply (c, position_lookup));
}
};
struct ExtensionPos : Extension
{
friend struct PosLookupSubTable;
private:
inline const struct PosLookupSubTable& get_subtable (void) const
{
unsigned int offset = get_offset ();
if (unlikely (!offset)) return Null(PosLookupSubTable);
return StructAtOffset<PosLookupSubTable> (this, offset);
}
inline bool apply (hb_apply_context_t *c) const;
inline bool sanitize (hb_sanitize_context_t *c);
};
/*
* PosLookup
*/
struct PosLookupSubTable
{
friend struct PosLookup;
enum Type {
Single = 1,
Pair = 2,
Cursive = 3,
MarkBase = 4,
MarkLig = 5,
MarkMark = 6,
Context = 7,
ChainContext = 8,
Extension = 9
};
inline bool can_use_fast_path (unsigned int lookup_type) const
{
/* Fast path, for those that have coverage in the same place. */
return likely (lookup_type && lookup_type < Context) ||
(hb_in_range<unsigned int> (lookup_type, Context, ChainContext) &&
hb_in_range<unsigned int> (u.header.sub_format, 1, 2));
}
inline bool apply (hb_apply_context_t *c, unsigned int lookup_type) const
{
TRACE_APPLY ();
if (can_use_fast_path (lookup_type))
{
/* Fast path, for most that have coverage in the same place. */
hb_codepoint_t glyph_id = c->buffer->cur().codepoint;
unsigned int index = (this+u.header.coverage) (glyph_id);
if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
}
switch (lookup_type) {
case Single: return TRACE_RETURN (u.single.apply (c));
case Pair: return TRACE_RETURN (u.pair.apply (c));
case Cursive: return TRACE_RETURN (u.cursive.apply (c));
case MarkBase: return TRACE_RETURN (u.markBase.apply (c));
case MarkLig: return TRACE_RETURN (u.markLig.apply (c));
case MarkMark: return TRACE_RETURN (u.markMark.apply (c));
case Context: return TRACE_RETURN (u.c.apply (c));
case ChainContext: return TRACE_RETURN (u.chainContext.apply (c));
case Extension: return TRACE_RETURN (u.extension.apply (c));
default: return TRACE_RETURN (false);
}
}
inline bool sanitize (hb_sanitize_context_t *c, unsigned int lookup_type) {
TRACE_SANITIZE ();
if (!u.header.sub_format.sanitize (c) ||
(can_use_fast_path (lookup_type) && !u.header.coverage.sanitize (c, this)))
return TRACE_RETURN (false);
switch (lookup_type) {
case Single: return TRACE_RETURN (u.single.sanitize (c));
case Pair: return TRACE_RETURN (u.pair.sanitize (c));
case Cursive: return TRACE_RETURN (u.cursive.sanitize (c));
case MarkBase: return TRACE_RETURN (u.markBase.sanitize (c));
case MarkLig: return TRACE_RETURN (u.markLig.sanitize (c));
case MarkMark: return TRACE_RETURN (u.markMark.sanitize (c));
case Context: return TRACE_RETURN (u.c.sanitize (c));
case ChainContext: return TRACE_RETURN (u.chainContext.sanitize (c));
case Extension: return TRACE_RETURN (u.extension.sanitize (c));
default: return TRACE_RETURN (true);
}
}
private:
union {
struct {
USHORT sub_format;
OffsetTo<Coverage> coverage;
} header;
SinglePos single;
PairPos pair;
CursivePos cursive;
MarkBasePos markBase;
MarkLigPos markLig;
MarkMarkPos markMark;
ContextPos c;
ChainContextPos chainContext;
ExtensionPos extension;
} u;
public:
DEFINE_SIZE_UNION (2, header.sub_format);
};
struct PosLookup : Lookup
{
inline const PosLookupSubTable& get_subtable (unsigned int i) const
{ return this+CastR<OffsetArrayOf<PosLookupSubTable> > (subTable)[i]; }
inline bool apply_once (hb_apply_context_t *c) const
{
unsigned int lookup_type = get_type ();
if (!_hb_ot_layout_check_glyph_property (c->face, &c->buffer->cur(), c->lookup_props, &c->property))
return false;
unsigned int count = get_subtable_count ();
for (unsigned int i = 0; i < count; i++)
if (get_subtable (i).apply (c, lookup_type))
return true;
return false;
}
inline bool apply_string (hb_apply_context_t *c) const
{
bool ret = false;
if (unlikely (!c->buffer->len))
return false;
c->set_lookup (*this);
c->buffer->idx = 0;
while (c->buffer->idx < c->buffer->len)
{
if ((c->buffer->cur().mask & c->lookup_mask) && apply_once (c))
ret = true;
else
c->buffer->idx++;
}
return ret;
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
if (unlikely (!Lookup::sanitize (c))) return TRACE_RETURN (false);
OffsetArrayOf<PosLookupSubTable> &list = CastR<OffsetArrayOf<PosLookupSubTable> > (subTable);
return TRACE_RETURN (list.sanitize (c, this, get_type ()));
}
};
typedef OffsetListOf<PosLookup> PosLookupList;
/*
* GPOS -- The Glyph Positioning Table
*/
struct GPOS : GSUBGPOS
{
static const hb_tag_t Tag = HB_OT_TAG_GPOS;
inline const PosLookup& get_lookup (unsigned int i) const
{ return CastR<PosLookup> (GSUBGPOS::get_lookup (i)); }
inline bool position_lookup (hb_apply_context_t *c, unsigned int lookup_index) const
{ return get_lookup (lookup_index).apply_string (c); }
static inline void position_start (hb_buffer_t *buffer);
static inline void position_finish (hb_buffer_t *buffer);
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE ();
if (unlikely (!GSUBGPOS::sanitize (c))) return TRACE_RETURN (false);
OffsetTo<PosLookupList> &list = CastR<OffsetTo<PosLookupList> > (lookupList);
return TRACE_RETURN (list.sanitize (c, this));
}
public:
DEFINE_SIZE_STATIC (10);
};
static void
fix_cursive_minor_offset (hb_glyph_position_t *pos, unsigned int i, hb_direction_t direction)
{
unsigned int j = pos[i].cursive_chain();
if (likely (!j))
return;
j += i;
pos[i].cursive_chain() = 0;
fix_cursive_minor_offset (pos, j, direction);
if (HB_DIRECTION_IS_HORIZONTAL (direction))
pos[i].y_offset += pos[j].y_offset;
else
pos[i].x_offset += pos[j].x_offset;
}
static void
fix_mark_attachment (hb_glyph_position_t *pos, unsigned int i, hb_direction_t direction)
{
if (likely (!(pos[i].attach_lookback())))
return;
unsigned int j = i - pos[i].attach_lookback();
pos[i].x_advance = 0;
pos[i].y_advance = 0;
pos[i].x_offset += pos[j].x_offset;
pos[i].y_offset += pos[j].y_offset;
if (HB_DIRECTION_IS_FORWARD (direction))
for (unsigned int k = j; k < i; k++) {
pos[i].x_offset -= pos[k].x_advance;
pos[i].y_offset -= pos[k].y_advance;
}
else
for (unsigned int k = j + 1; k < i + 1; k++) {
pos[i].x_offset += pos[k].x_advance;
pos[i].y_offset += pos[k].y_advance;
}
}
void
GPOS::position_start (hb_buffer_t *buffer)
{
buffer->clear_positions ();
unsigned int count = buffer->len;
for (unsigned int i = 0; i < count; i++)
buffer->pos[i].attach_lookback() = buffer->pos[i].cursive_chain() = 0;
}
void
GPOS::position_finish (hb_buffer_t *buffer)
{
unsigned int len;
hb_glyph_position_t *pos = hb_buffer_get_glyph_positions (buffer, &len);
hb_direction_t direction = buffer->props.direction;
/* Handle cursive connections */
for (unsigned int i = 0; i < len; i++)
fix_cursive_minor_offset (pos, i, direction);
/* Handle attachments */
for (unsigned int i = 0; i < len; i++)
fix_mark_attachment (pos, i, direction);
HB_BUFFER_DEALLOCATE_VAR (buffer, syllable);
HB_BUFFER_DEALLOCATE_VAR (buffer, lig_props);
HB_BUFFER_DEALLOCATE_VAR (buffer, props_cache);
}
/* Out-of-class implementation for methods recursing */
inline bool ExtensionPos::apply (hb_apply_context_t *c) const
{
TRACE_APPLY ();
return TRACE_RETURN (get_subtable ().apply (c, get_type ()));
}
inline bool ExtensionPos::sanitize (hb_sanitize_context_t *c)
{
TRACE_SANITIZE ();
if (unlikely (!Extension::sanitize (c))) return TRACE_RETURN (false);
unsigned int offset = get_offset ();
if (unlikely (!offset)) return TRACE_RETURN (true);
return TRACE_RETURN (StructAtOffset<PosLookupSubTable> (this, offset).sanitize (c, get_type ()));
}
static inline bool position_lookup (hb_apply_context_t *c, unsigned int lookup_index)
{
const GPOS &gpos = *(c->face->ot_layout->gpos);
const PosLookup &l = gpos.get_lookup (lookup_index);
if (unlikely (c->nesting_level_left == 0))
return false;
hb_apply_context_t new_c (*c);
new_c.nesting_level_left--;
new_c.set_lookup (l);
return l.apply_once (&new_c);
}
#undef attach_lookback
#undef cursive_chain
#endif /* HB_OT_LAYOUT_GPOS_TABLE_HH */