/* * 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" namespace OT { /* 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& get_device (Value* value) { return *CastP > (value); } static inline const OffsetTo& get_device (const Value* value) { return *CastP > (value); } static inline const SHORT& get_short (const Value* value) { return *CastP (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 (this); 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 (this); 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 (this); 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 { 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 (this); return TRACE_RETURN (c->check_struct (this)); } protected: 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 { 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 = font->get_glyph_contour_point_for_origin (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 (this); return TRACE_RETURN (c->check_struct (this)); } protected: 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 { 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 (this); return TRACE_RETURN (c->check_struct (this) && xDeviceTable.sanitize (c, this) && yDeviceTable.sanitize (c, this)); } protected: USHORT format; /* Format identifier--format = 3 */ SHORT xCoordinate; /* Horizontal value--in design units */ SHORT yCoordinate; /* Vertical value--in design units */ OffsetTo xDeviceTable; /* Offset to Device table for X * coordinate-- from beginning of * Anchor table (may be NULL) */ OffsetTo 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 (this); 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); } } protected: 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 (this); 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 */ protected: OffsetTo 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 (this); return TRACE_RETURN (c->check_struct (this) && markAnchor.sanitize (c, base)); } protected: USHORT klass; /* Class defined for this mark */ OffsetTo markAnchor; /* Offset to Anchor table--from * beginning of MarkArray table */ public: DEFINE_SIZE_STATIC (4); }; struct MarkArray : ArrayOf /* 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 (this); const MarkRecord &record = ArrayOf::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 (this); return TRACE_RETURN (ArrayOf::sanitize (c, this)); } }; /* Lookups */ struct SinglePosFormat1 { inline void collect_glyphs (hb_collect_glyphs_context_t *c) const { TRACE_COLLECT_GLYPHS (this); (this+coverage).add_coverage (&c->input); } inline const Coverage &get_coverage (void) const { return this+coverage; } inline bool apply (hb_apply_context_t *c) const { TRACE_APPLY (this); unsigned int index = (this+coverage).get_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 (this); return TRACE_RETURN (c->check_struct (this) && coverage.sanitize (c, this) && valueFormat.sanitize_value (c, this, values)); } protected: USHORT format; /* Format identifier--format = 1 */ OffsetTo 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 { inline void collect_glyphs (hb_collect_glyphs_context_t *c) const { TRACE_COLLECT_GLYPHS (this); (this+coverage).add_coverage (&c->input); } inline const Coverage &get_coverage (void) const { return this+coverage; } inline bool apply (hb_apply_context_t *c) const { TRACE_APPLY (this); unsigned int index = (this+coverage).get_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 (this); return TRACE_RETURN (c->check_struct (this) && coverage.sanitize (c, this) && valueFormat.sanitize_values (c, this, values, valueCount)); } protected: USHORT format; /* Format identifier--format = 2 */ OffsetTo 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 { template inline typename context_t::return_t process (context_t *c) const { TRACE_PROCESS (this); switch (u.format) { case 1: return TRACE_RETURN (c->process (u.format1)); case 2: return TRACE_RETURN (c->process (u.format2)); default:return TRACE_RETURN (c->default_return_value ()); } } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (this); 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); } } protected: union { USHORT format; /* Format identifier */ SinglePosFormat1 format1; SinglePosFormat2 format2; } u; }; struct PairValueRecord { friend struct PairSet; protected: 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 void collect_glyphs (hb_collect_glyphs_context_t *c, const ValueFormat *valueFormats) const { TRACE_COLLECT_GLYPHS (this); unsigned int len1 = valueFormats[0].get_len (); unsigned int len2 = valueFormats[1].get_len (); unsigned int record_size = USHORT::static_size * (1 + len1 + len2); const PairValueRecord *record = CastP (array); unsigned int count = len; for (unsigned int i = 0; i < count; i++) { c->input.add (record->secondGlyph); record = &StructAtOffset (record, record_size); } } inline bool apply (hb_apply_context_t *c, const ValueFormat *valueFormats, unsigned int pos) const { TRACE_APPLY (this); unsigned int len1 = valueFormats[0].get_len (); unsigned int len2 = valueFormats[1].get_len (); unsigned int record_size = USHORT::static_size * (1 + len1 + len2); const PairValueRecord *record = CastP (array); unsigned int count = len; 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 (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 (this); 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 (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)); } protected: 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 { inline void collect_glyphs (hb_collect_glyphs_context_t *c) const { TRACE_COLLECT_GLYPHS (this); (this+coverage).add_coverage (&c->input); unsigned int count = pairSet.len; for (unsigned int i = 0; i < count; i++) (this+pairSet[i]).collect_glyphs (c, &valueFormat1); } inline const Coverage &get_coverage (void) const { return this+coverage; } inline bool apply (hb_apply_context_t *c) const { TRACE_APPLY (this); 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).get_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 (this); 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)); } protected: USHORT format; /* Format identifier--format = 1 */ OffsetTo 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; /* Array of PairSet tables * ordered by Coverage Index */ public: DEFINE_SIZE_ARRAY (10, pairSet); }; struct PairPosFormat2 { inline void collect_glyphs (hb_collect_glyphs_context_t *c) const { TRACE_COLLECT_GLYPHS (this); /* (this+coverage).add_coverage (&c->input); // Don't need this. */ /* TODO only add values for pairs that have nonzero adjustments. */ unsigned int count1 = class1Count; const ClassDef &klass1 = this+classDef1; for (unsigned int i = 0; i < count1; i++) klass1.add_class (&c->input, i); unsigned int count2 = class2Count; const ClassDef &klass2 = this+classDef2; for (unsigned int i = 0; i < count2; i++) klass2.add_class (&c->input, i); } inline const Coverage &get_coverage (void) const { return this+coverage; } inline bool apply (hb_apply_context_t *c) const { TRACE_APPLY (this); 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).get_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).get_class (c->buffer->cur().codepoint); unsigned int klass2 = (this+classDef2).get_class (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 (this); 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)); } protected: USHORT format; /* Format identifier--format = 2 */ OffsetTo 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 classDef1; /* Offset to ClassDef table--from * beginning of PairPos subtable--for * the first glyph of the pair */ OffsetTo 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 { template inline typename context_t::return_t process (context_t *c) const { TRACE_PROCESS (this); switch (u.format) { case 1: return TRACE_RETURN (c->process (u.format1)); case 2: return TRACE_RETURN (c->process (u.format2)); default:return TRACE_RETURN (c->default_return_value ()); } } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (this); 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); } } protected: 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 (this); return TRACE_RETURN (entryAnchor.sanitize (c, base) && exitAnchor.sanitize (c, base)); } protected: OffsetTo entryAnchor; /* Offset to EntryAnchor table--from * beginning of CursivePos * subtable--may be NULL */ OffsetTo exitAnchor; /* Offset to ExitAnchor table--from * beginning of CursivePos * subtable--may be NULL */ public: DEFINE_SIZE_STATIC (4); }; struct CursivePosFormat1 { inline void collect_glyphs (hb_collect_glyphs_context_t *c) const { TRACE_COLLECT_GLYPHS (this); (this+coverage).add_coverage (&c->input); } inline const Coverage &get_coverage (void) const { return this+coverage; } inline bool apply (hb_apply_context_t *c) const { TRACE_APPLY (this); /* We don't handle mark glyphs here. */ if (c->property & HB_OT_LAYOUT_GLYPH_PROPS_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).get_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).get_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 (this); return TRACE_RETURN (coverage.sanitize (c, this) && entryExitRecord.sanitize (c, this)); } protected: USHORT format; /* Format identifier--format = 1 */ OffsetTo coverage; /* Offset to Coverage table--from * beginning of subtable */ ArrayOf entryExitRecord; /* Array of EntryExit records--in * Coverage Index order */ public: DEFINE_SIZE_ARRAY (6, entryExitRecord); }; struct CursivePos { template inline typename context_t::return_t process (context_t *c) const { TRACE_PROCESS (this); switch (u.format) { case 1: return TRACE_RETURN (c->process (u.format1)); default:return TRACE_RETURN (c->default_return_value ()); } } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (this); 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); } } protected: 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 { inline void collect_glyphs (hb_collect_glyphs_context_t *c) const { TRACE_COLLECT_GLYPHS (this); (this+markCoverage).add_coverage (&c->input); (this+baseCoverage).add_coverage (&c->input); /* TODO only add combinations that have nonzero adjustment. */ } inline const Coverage &get_coverage (void) const { return this+markCoverage; } inline bool apply (hb_apply_context_t *c) const { TRACE_APPLY (this); unsigned int mark_index = (this+markCoverage).get_coverage (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_PROPS_BASE_GLYPH)) {/*return TRACE_RETURN (false);*/} unsigned int base_index = (this+baseCoverage).get_coverage (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 (this); 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)); } protected: USHORT format; /* Format identifier--format = 1 */ OffsetTo markCoverage; /* Offset to MarkCoverage table--from * beginning of MarkBasePos subtable */ OffsetTo baseCoverage; /* Offset to BaseCoverage table--from * beginning of MarkBasePos subtable */ USHORT classCount; /* Number of classes defined for marks */ OffsetTo markArray; /* Offset to MarkArray table--from * beginning of MarkBasePos subtable */ OffsetTo baseArray; /* Offset to BaseArray table--from * beginning of MarkBasePos subtable */ public: DEFINE_SIZE_STATIC (12); }; struct MarkBasePos { template inline typename context_t::return_t process (context_t *c) const { TRACE_PROCESS (this); switch (u.format) { case 1: return TRACE_RETURN (c->process (u.format1)); default:return TRACE_RETURN (c->default_return_value ()); } } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (this); 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); } } protected: 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 LigatureArray; /* Array of LigatureAttach * tables ordered by * LigatureCoverage Index */ struct MarkLigPosFormat1 { inline void collect_glyphs (hb_collect_glyphs_context_t *c) const { TRACE_COLLECT_GLYPHS (this); (this+markCoverage).add_coverage (&c->input); (this+ligatureCoverage).add_coverage (&c->input); /* TODO only add combinations that have nonzero adjustment. */ } inline const Coverage &get_coverage (void) const { return this+markCoverage; } inline bool apply (hb_apply_context_t *c) const { TRACE_APPLY (this); unsigned int mark_index = (this+markCoverage).get_coverage (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_PROPS_LIGATURE)) {/*return TRACE_RETURN (false);*/} unsigned int j = skippy_iter.idx; unsigned int lig_index = (this+ligatureCoverage).get_coverage (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); /* 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. */ unsigned int comp_index; unsigned int lig_id = get_lig_id (c->buffer->info[j]); unsigned int mark_id = get_lig_id (c->buffer->cur()); unsigned int mark_comp = get_lig_comp (c->buffer->cur()); if (lig_id && lig_id == mark_id && mark_comp > 0) comp_index = MIN (comp_count, get_lig_comp (c->buffer->cur())) - 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 (this); 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)); } protected: USHORT format; /* Format identifier--format = 1 */ OffsetTo markCoverage; /* Offset to Mark Coverage table--from * beginning of MarkLigPos subtable */ OffsetTo ligatureCoverage; /* Offset to Ligature Coverage * table--from beginning of MarkLigPos * subtable */ USHORT classCount; /* Number of defined mark classes */ OffsetTo markArray; /* Offset to MarkArray table--from * beginning of MarkLigPos subtable */ OffsetTo ligatureArray; /* Offset to LigatureArray table--from * beginning of MarkLigPos subtable */ public: DEFINE_SIZE_STATIC (12); }; struct MarkLigPos { template inline typename context_t::return_t process (context_t *c) const { TRACE_PROCESS (this); switch (u.format) { case 1: return TRACE_RETURN (c->process (u.format1)); default:return TRACE_RETURN (c->default_return_value ()); } } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (this); 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); } } protected: 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 { inline void collect_glyphs (hb_collect_glyphs_context_t *c) const { TRACE_COLLECT_GLYPHS (this); (this+mark1Coverage).add_coverage (&c->input); (this+mark2Coverage).add_coverage (&c->input); /* TODO only add combinations that have nonzero adjustment. */ } inline const Coverage &get_coverage (void) const { return this+mark1Coverage; } inline bool apply (hb_apply_context_t *c) const { TRACE_APPLY (this); unsigned int mark1_index = (this+mark1Coverage).get_coverage (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_PROPS_MARK)) return TRACE_RETURN (false); unsigned int j = skippy_iter.idx; unsigned int id1 = get_lig_id (c->buffer->cur()); unsigned int id2 = get_lig_id (c->buffer->info[j]); unsigned int comp1 = get_lig_comp (c->buffer->cur()); unsigned int comp2 = get_lig_comp (c->buffer->info[j]); if (likely (id1 == id2)) { if (id1 == 0) /* Marks belonging to the same base. */ goto good; else if (comp1 == comp2) /* Marks belonging to the same ligature component. */ goto good; } else { /* If ligature ids don't match, it may be the case that one of the marks * itself is a ligature. In which case match. */ if ((id1 > 0 && !comp1) || (id2 > 0 && !comp2)) goto good; } /* Didn't match. */ return TRACE_RETURN (false); good: unsigned int mark2_index = (this+mark2Coverage).get_coverage (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 (this); 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)); } protected: USHORT format; /* Format identifier--format = 1 */ OffsetTo mark1Coverage; /* Offset to Combining Mark1 Coverage * table--from beginning of MarkMarkPos * subtable */ OffsetTo mark2Coverage; /* Offset to Combining Mark2 Coverage * table--from beginning of MarkMarkPos * subtable */ USHORT classCount; /* Number of defined mark classes */ OffsetTo mark1Array; /* Offset to Mark1Array table--from * beginning of MarkMarkPos subtable */ OffsetTo mark2Array; /* Offset to Mark2Array table--from * beginning of MarkMarkPos subtable */ public: DEFINE_SIZE_STATIC (12); }; struct MarkMarkPos { template inline typename context_t::return_t process (context_t *c) const { TRACE_PROCESS (this); switch (u.format) { case 1: return TRACE_RETURN (c->process (u.format1)); default:return TRACE_RETURN (c->default_return_value ()); } } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (this); 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); } } protected: union { USHORT format; /* Format identifier */ MarkMarkPosFormat1 format1; } u; }; struct ContextPos : Context {}; struct ChainContextPos : ChainContext {}; struct ExtensionPos : Extension { typedef struct PosLookupSubTable LookupSubTable; }; /* * 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 }; template inline typename context_t::return_t process (context_t *c, unsigned int lookup_type) const { TRACE_PROCESS (this); switch (lookup_type) { case Single: return TRACE_RETURN (u.single.process (c)); case Pair: return TRACE_RETURN (u.pair.process (c)); case Cursive: return TRACE_RETURN (u.cursive.process (c)); case MarkBase: return TRACE_RETURN (u.markBase.process (c)); case MarkLig: return TRACE_RETURN (u.markLig.process (c)); case MarkMark: return TRACE_RETURN (u.markMark.process (c)); case Context: return TRACE_RETURN (u.context.process (c)); case ChainContext: return TRACE_RETURN (u.chainContext.process (c)); case Extension: return TRACE_RETURN (u.extension.process (c)); default: return TRACE_RETURN (c->default_return_value ()); } } inline bool sanitize (hb_sanitize_context_t *c, unsigned int lookup_type) { TRACE_SANITIZE (this); if (!u.header.sub_format.sanitize (c)) 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.context.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); } } protected: union { struct { USHORT sub_format; } header; SinglePos single; PairPos pair; CursivePos cursive; MarkBasePos markBase; MarkLigPos markLig; MarkMarkPos markMark; ContextPos context; 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 > (subTable)[i]; } template inline typename context_t::return_t process (context_t *c) const { TRACE_PROCESS (this); unsigned int lookup_type = get_type (); unsigned int count = get_subtable_count (); for (unsigned int i = 0; i < count; i++) { typename context_t::return_t r = get_subtable (i).process (c, lookup_type); if (c->stop_sublookup_iteration (r)) return TRACE_RETURN (r); } return TRACE_RETURN (c->default_return_value ()); } template static inline typename context_t::return_t process_recurse_func (context_t *c, unsigned int lookup_index); inline hb_collect_glyphs_context_t::return_t collect_glyphs_lookup (hb_collect_glyphs_context_t *c) const { TRACE_COLLECT_GLYPHS (this); c->set_recurse_func (NULL); return TRACE_RETURN (process (c)); } template inline void add_coverage (set_t *glyphs) const { hb_get_coverage_context_t c; const Coverage *last = NULL; unsigned int count = get_subtable_count (); for (unsigned int i = 0; i < count; i++) { const Coverage *coverage = &get_subtable (i).process (&c, get_type ()); if (coverage != last) { coverage->add_coverage (glyphs); last = coverage; } } } inline bool apply_once (hb_apply_context_t *c) const { TRACE_APPLY (this); if (!c->check_glyph_property (&c->buffer->cur(), c->lookup_props, &c->property)) return TRACE_RETURN (false); return TRACE_RETURN (process (c)); } static bool apply_recurse_func (hb_apply_context_t *c, unsigned int lookup_index); inline bool apply_string (hb_apply_context_t *c, const hb_set_digest_t *digest) const { bool ret = false; if (unlikely (!c->buffer->len || !c->lookup_mask)) return false; c->set_recurse_func (apply_recurse_func); c->set_lookup (*this); c->buffer->idx = 0; while (c->buffer->idx < c->buffer->len) { if ((c->buffer->cur().mask & c->lookup_mask) && digest->may_have (c->buffer->cur().codepoint) && apply_once (c)) ret = true; else c->buffer->idx++; } return ret; } inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (this); if (unlikely (!Lookup::sanitize (c))) return TRACE_RETURN (false); OffsetArrayOf &list = CastR > (subTable); return TRACE_RETURN (list.sanitize (c, this, get_type ())); } }; typedef OffsetListOf 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 (GSUBGPOS::get_lookup (i)); } static inline void position_start (hb_font_t *font, hb_buffer_t *buffer); static inline void position_finish (hb_font_t *font, hb_buffer_t *buffer, hb_bool_t zero_width_attahced_marks); inline bool sanitize (hb_sanitize_context_t *c) { TRACE_SANITIZE (this); if (unlikely (!GSUBGPOS::sanitize (c))) return TRACE_RETURN (false); OffsetTo &list = CastR > (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, hb_bool_t zero_width_attached_marks) { if (likely (!(pos[i].attach_lookback()))) return; unsigned int j = i - pos[i].attach_lookback(); if (zero_width_attached_marks) { 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_font_t *font HB_UNUSED, 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_font_t *font HB_UNUSED, hb_buffer_t *buffer, hb_bool_t zero_width_attached_marks) { 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, zero_width_attached_marks); HB_BUFFER_DEALLOCATE_VAR (buffer, syllable); HB_BUFFER_DEALLOCATE_VAR (buffer, lig_props); HB_BUFFER_DEALLOCATE_VAR (buffer, glyph_props); } /* Out-of-class implementation for methods recursing */ template inline typename context_t::return_t PosLookup::process_recurse_func (context_t *c, unsigned int lookup_index) { const GPOS &gpos = *(hb_ot_layout_from_face (c->face)->gpos); const PosLookup &l = gpos.get_lookup (lookup_index); return l.process (c); } inline bool PosLookup::apply_recurse_func (hb_apply_context_t *c, unsigned int lookup_index) { const GPOS &gpos = *(hb_ot_layout_from_face (c->face)->gpos); const PosLookup &l = gpos.get_lookup (lookup_index); unsigned int saved_lookup_props = c->lookup_props; unsigned int saved_property = c->property; c->set_lookup (l); bool ret = l.apply_once (c); c->lookup_props = saved_lookup_props; c->property = saved_property; return ret; } #undef attach_lookback #undef cursive_chain } /* namespace OT */ #endif /* HB_OT_LAYOUT_GPOS_TABLE_HH */