352 lines
12 KiB
C++
352 lines
12 KiB
C++
#ifndef OT_LAYOUT_GPOS_PAIRPOSFORMAT2_HH
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#define OT_LAYOUT_GPOS_PAIRPOSFORMAT2_HH
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#include "ValueFormat.hh"
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namespace OT {
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namespace Layout {
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namespace GPOS_impl {
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template <typename Types>
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struct PairPosFormat2_4
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{
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protected:
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HBUINT16 format; /* Format identifier--format = 2 */
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typename Types::template OffsetTo<Coverage>
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coverage; /* Offset to Coverage table--from
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* beginning of subtable */
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ValueFormat valueFormat1; /* ValueRecord definition--for the
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* first glyph of the pair--may be zero
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* (0) */
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ValueFormat valueFormat2; /* ValueRecord definition--for the
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* second glyph of the pair--may be
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* zero (0) */
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typename Types::template OffsetTo<ClassDef>
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classDef1; /* Offset to ClassDef table--from
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* beginning of PairPos subtable--for
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* the first glyph of the pair */
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typename Types::template OffsetTo<ClassDef>
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classDef2; /* Offset to ClassDef table--from
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* beginning of PairPos subtable--for
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* the second glyph of the pair */
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HBUINT16 class1Count; /* Number of classes in ClassDef1
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* table--includes Class0 */
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HBUINT16 class2Count; /* Number of classes in ClassDef2
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* table--includes Class0 */
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ValueRecord values; /* Matrix of value pairs:
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* class1-major, class2-minor,
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* Each entry has value1 and value2 */
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public:
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DEFINE_SIZE_ARRAY (10 + 3 * Types::size, values);
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bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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if (!(c->check_struct (this)
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&& coverage.sanitize (c, this)
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&& classDef1.sanitize (c, this)
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&& classDef2.sanitize (c, this))) return_trace (false);
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unsigned int len1 = valueFormat1.get_len ();
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unsigned int len2 = valueFormat2.get_len ();
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unsigned int stride = len1 + len2;
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unsigned int record_size = valueFormat1.get_size () + valueFormat2.get_size ();
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unsigned int count = (unsigned int) class1Count * (unsigned int) class2Count;
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return_trace (c->check_range ((const void *) values,
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count,
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record_size) &&
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valueFormat1.sanitize_values_stride_unsafe (c, this, &values[0], count, stride) &&
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valueFormat2.sanitize_values_stride_unsafe (c, this, &values[len1], count, stride));
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}
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bool intersects (const hb_set_t *glyphs) const
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{
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return (this+coverage).intersects (glyphs) &&
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(this+classDef2).intersects (glyphs);
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}
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void closure_lookups (hb_closure_lookups_context_t *c) const {}
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void collect_variation_indices (hb_collect_variation_indices_context_t *c) const
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{
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if (!intersects (c->glyph_set)) return;
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if ((!valueFormat1.has_device ()) && (!valueFormat2.has_device ())) return;
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hb_set_t klass1_glyphs, klass2_glyphs;
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if (!(this+classDef1).collect_coverage (&klass1_glyphs)) return;
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if (!(this+classDef2).collect_coverage (&klass2_glyphs)) return;
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hb_set_t class1_set, class2_set;
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for (const unsigned cp : + c->glyph_set->iter () | hb_filter (this + coverage))
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{
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if (!klass1_glyphs.has (cp)) class1_set.add (0);
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else
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{
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unsigned klass1 = (this+classDef1).get (cp);
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class1_set.add (klass1);
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}
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}
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class2_set.add (0);
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for (const unsigned cp : + c->glyph_set->iter () | hb_filter (klass2_glyphs))
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{
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unsigned klass2 = (this+classDef2).get (cp);
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class2_set.add (klass2);
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}
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if (class1_set.is_empty ()
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|| class2_set.is_empty ()
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|| (class2_set.get_population() == 1 && class2_set.has(0)))
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return;
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unsigned len1 = valueFormat1.get_len ();
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unsigned len2 = valueFormat2.get_len ();
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const hb_array_t<const Value> values_array = values.as_array ((unsigned)class1Count * (unsigned) class2Count * (len1 + len2));
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for (const unsigned class1_idx : class1_set.iter ())
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{
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for (const unsigned class2_idx : class2_set.iter ())
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{
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unsigned start_offset = (class1_idx * (unsigned) class2Count + class2_idx) * (len1 + len2);
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if (valueFormat1.has_device ())
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valueFormat1.collect_variation_indices (c, this, values_array.sub_array (start_offset, len1));
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if (valueFormat2.has_device ())
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valueFormat2.collect_variation_indices (c, this, values_array.sub_array (start_offset+len1, len2));
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}
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}
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}
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void collect_glyphs (hb_collect_glyphs_context_t *c) const
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{
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if (unlikely (!(this+coverage).collect_coverage (c->input))) return;
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if (unlikely (!(this+classDef2).collect_coverage (c->input))) return;
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}
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const Coverage &get_coverage () const { return this+coverage; }
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bool apply (hb_ot_apply_context_t *c) const
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{
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TRACE_APPLY (this);
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hb_buffer_t *buffer = c->buffer;
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unsigned int index = (this+coverage).get_coverage (buffer->cur().codepoint);
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if (likely (index == NOT_COVERED)) return_trace (false);
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hb_ot_apply_context_t::skipping_iterator_t &skippy_iter = c->iter_input;
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skippy_iter.reset (buffer->idx, 1);
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unsigned unsafe_to;
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if (!skippy_iter.next (&unsafe_to))
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{
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buffer->unsafe_to_concat (buffer->idx, unsafe_to);
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return_trace (false);
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}
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unsigned int len1 = valueFormat1.get_len ();
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unsigned int len2 = valueFormat2.get_len ();
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unsigned int record_len = len1 + len2;
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unsigned int klass1 = (this+classDef1).get_class (buffer->cur().codepoint);
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unsigned int klass2 = (this+classDef2).get_class (buffer->info[skippy_iter.idx].codepoint);
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if (unlikely (klass1 >= class1Count || klass2 >= class2Count))
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{
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buffer->unsafe_to_concat (buffer->idx, skippy_iter.idx + 1);
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return_trace (false);
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}
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const Value *v = &values[record_len * (klass1 * class2Count + klass2)];
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bool applied_first = false, applied_second = false;
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/* Isolate simple kerning and apply it half to each side.
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* Results in better cursor positinoing / underline drawing.
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*
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* Disabled, because causes issues... :-(
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* https://github.com/harfbuzz/harfbuzz/issues/3408
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* https://github.com/harfbuzz/harfbuzz/pull/3235#issuecomment-1029814978
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*/
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#ifndef HB_SPLIT_KERN
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if (0)
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#endif
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{
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if (!len2)
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{
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const hb_direction_t dir = buffer->props.direction;
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const bool horizontal = HB_DIRECTION_IS_HORIZONTAL (dir);
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const bool backward = HB_DIRECTION_IS_BACKWARD (dir);
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unsigned mask = horizontal ? ValueFormat::xAdvance : ValueFormat::yAdvance;
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if (backward)
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mask |= mask >> 2; /* Add eg. xPlacement in RTL. */
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/* Add Devices. */
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mask |= mask << 4;
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if (valueFormat1 & ~mask)
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goto bail;
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/* Is simple kern. Apply value on an empty position slot,
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* then split it between sides. */
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hb_glyph_position_t pos{};
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if (valueFormat1.apply_value (c, this, v, pos))
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{
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hb_position_t *src = &pos.x_advance;
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hb_position_t *dst1 = &buffer->cur_pos().x_advance;
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hb_position_t *dst2 = &buffer->pos[skippy_iter.idx].x_advance;
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unsigned i = horizontal ? 0 : 1;
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hb_position_t kern = src[i];
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hb_position_t kern1 = kern >> 1;
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hb_position_t kern2 = kern - kern1;
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if (!backward)
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{
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dst1[i] += kern1;
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dst2[i] += kern2;
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dst2[i + 2] += kern2;
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}
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else
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{
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dst1[i] += kern1;
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dst1[i + 2] += src[i + 2] - kern2;
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dst2[i] += kern2;
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}
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applied_first = applied_second = kern != 0;
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goto success;
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}
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goto boring;
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}
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}
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bail:
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if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
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{
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c->buffer->message (c->font,
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"try kerning glyphs at %u,%u",
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c->buffer->idx, skippy_iter.idx);
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}
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applied_first = valueFormat1.apply_value (c, this, v, buffer->cur_pos());
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applied_second = valueFormat2.apply_value (c, this, v + len1, buffer->pos[skippy_iter.idx]);
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if (applied_first || applied_second)
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if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
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{
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c->buffer->message (c->font,
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"kerned glyphs at %u,%u",
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c->buffer->idx, skippy_iter.idx);
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}
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if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
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{
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c->buffer->message (c->font,
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"tried kerning glyphs at %u,%u",
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c->buffer->idx, skippy_iter.idx);
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}
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success:
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if (applied_first || applied_second)
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buffer->unsafe_to_break (buffer->idx, skippy_iter.idx + 1);
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else
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boring:
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buffer->unsafe_to_concat (buffer->idx, skippy_iter.idx + 1);
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if (len2)
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{
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skippy_iter.idx++;
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// https://github.com/harfbuzz/harfbuzz/issues/3824
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// https://github.com/harfbuzz/harfbuzz/issues/3888#issuecomment-1326781116
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buffer->unsafe_to_break (buffer->idx, skippy_iter.idx + 1);
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}
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buffer->idx = skippy_iter.idx;
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return_trace (true);
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}
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bool subset (hb_subset_context_t *c) const
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{
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TRACE_SUBSET (this);
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auto *out = c->serializer->start_embed (*this);
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if (unlikely (!c->serializer->extend_min (out))) return_trace (false);
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out->format = format;
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hb_map_t klass1_map;
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out->classDef1.serialize_subset (c, classDef1, this, &klass1_map, true, true, &(this + coverage));
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out->class1Count = klass1_map.get_population ();
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hb_map_t klass2_map;
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out->classDef2.serialize_subset (c, classDef2, this, &klass2_map, true, false);
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out->class2Count = klass2_map.get_population ();
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unsigned len1 = valueFormat1.get_len ();
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unsigned len2 = valueFormat2.get_len ();
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hb_pair_t<unsigned, unsigned> newFormats = hb_pair (valueFormat1, valueFormat2);
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if (c->plan->flags & HB_SUBSET_FLAGS_NO_HINTING)
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newFormats = compute_effective_value_formats (klass1_map, klass2_map);
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out->valueFormat1 = newFormats.first;
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out->valueFormat2 = newFormats.second;
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if (c->plan->all_axes_pinned)
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{
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out->valueFormat1 = out->valueFormat1.drop_device_table_flags ();
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out->valueFormat2 = out->valueFormat2.drop_device_table_flags ();
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}
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for (unsigned class1_idx : + hb_range ((unsigned) class1Count) | hb_filter (klass1_map))
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{
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for (unsigned class2_idx : + hb_range ((unsigned) class2Count) | hb_filter (klass2_map))
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{
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unsigned idx = (class1_idx * (unsigned) class2Count + class2_idx) * (len1 + len2);
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valueFormat1.copy_values (c->serializer, out->valueFormat1, this, &values[idx], &c->plan->layout_variation_idx_delta_map);
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valueFormat2.copy_values (c->serializer, out->valueFormat2, this, &values[idx + len1], &c->plan->layout_variation_idx_delta_map);
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}
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}
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const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
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const hb_map_t &glyph_map = *c->plan->glyph_map;
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auto it =
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+ hb_iter (this+coverage)
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| hb_filter (glyphset)
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| hb_map_retains_sorting (glyph_map)
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;
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out->coverage.serialize_serialize (c->serializer, it);
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return_trace (out->class1Count && out->class2Count && bool (it));
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}
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hb_pair_t<unsigned, unsigned> compute_effective_value_formats (const hb_map_t& klass1_map,
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const hb_map_t& klass2_map) const
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{
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unsigned len1 = valueFormat1.get_len ();
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unsigned len2 = valueFormat2.get_len ();
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unsigned record_size = len1 + len2;
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unsigned format1 = 0;
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unsigned format2 = 0;
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for (unsigned class1_idx : + hb_range ((unsigned) class1Count) | hb_filter (klass1_map))
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{
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for (unsigned class2_idx : + hb_range ((unsigned) class2Count) | hb_filter (klass2_map))
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{
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unsigned idx = (class1_idx * (unsigned) class2Count + class2_idx) * record_size;
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format1 = format1 | valueFormat1.get_effective_format (&values[idx]);
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format2 = format2 | valueFormat2.get_effective_format (&values[idx + len1]);
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}
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if (format1 == valueFormat1 && format2 == valueFormat2)
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break;
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}
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return hb_pair (format1, format2);
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}
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};
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}
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}
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}
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#endif // OT_LAYOUT_GPOS_PAIRPOSFORMAT2_HH
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