From: Behdad Esfahbod Date: Mon, 18 May 2009 21:09:33 +0000 (-0400) Subject: [HB] Start GPOS! X-Git-Tag: submit/master/20120920.151126~7^2~1205 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5e5eb0573f7ea2ce2cf037fef0df70a4351e82c0;p=framework%2Fuifw%2Fharfbuzz.git [HB] Start GPOS! --- diff --git a/src/hb-ot-layout-gpos-private.h b/src/hb-ot-layout-gpos-private.h new file mode 100644 index 0000000..b0b9513 --- /dev/null +++ b/src/hb-ot-layout-gpos-private.h @@ -0,0 +1,915 @@ +/* + * Copyright (C) 2007,2008,2009 Red Hat, Inc. + * + * This is part of HarfBuzz, an OpenType Layout engine 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 + */ + +#ifndef HB_OT_LAYOUT_GPOS_PRIVATE_H +#define HB_OT_LAYOUT_GPOS_PRIVATE_H + +#include "hb-ot-layout-gsubgpos-private.h" + +/* XXX */ +#include "harfbuzz-impl.h" + + +/* Shared Tables: ValueRecord, Anchor Table, and MarkArray */ + +typedef SHORT Value; +typedef Value ValueRecord[]; + +#if 0 +struct ValueRecord { + /* TODO */ + + private: + 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) */ +}; +ASSERT_SIZE (ValueRecord, 16); + +struct ValueFormat { + /* TODO */ + + private: + 0x0001 xPlacement; /* Includes horizontal adjustment + * for placement */ + 0x0002 yPlacement; /* Includes vertical adjustment for + * placement */ + 0x0004 xAdvance; /* Includes horizontal adjustment + * for advance */ + 0x0008 yAdvance; /* Includes vertical adjustment for + * advance */ + 0x0010 xPlaDevice; /* Includes horizontal Device table + * for placement */ + 0x0020 yPlaDevice; /* Includes vertical Device table + * for placement */ + 0x0040 xAdvDevice; /* Includes horizontal Device table + * for advance */ + 0x0080 yAdvDevice; /* Includes vertical Device table + * for advance */ + 0xF000 reserved; /* For future use */ +}; +ASSERT_SIZE (ValueFormat, 18); +#endif + + +struct AnchorFormat1 { + + friend struct Anchor; + + private: + inline void get_anchor (hb_ot_layout_t *layout, hb_codepoint_t glyph_id, + hb_position_t *x, hb_position_t *y) const { + *x = layout->gpos_info.x_scale * xCoordinate / 0x10000; + *y = layout->gpos_info.y_scale * yCoordinate / 0x10000; + } + + private: + USHORT format; /* Format identifier--format = 1 */ + SHORT xCoordinate; /* Horizontal value--in design units */ + SHORT yCoordinate; /* Vertical value--in design units */ +}; +ASSERT_SIZE (AnchorFormat1, 6); + +struct AnchorFormat2 { + + friend struct Anchor; + + private: + inline void get_anchor (hb_ot_layout_t *layout, hb_codepoint_t glyph_id, + hb_position_t *x, hb_position_t *y) const { + /* TODO Contour */ + *x = layout->gpos_info.x_scale * xCoordinate / 0x10000; + *y = layout->gpos_info.y_scale * yCoordinate / 0x10000; + } + + 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 */ +}; +ASSERT_SIZE (AnchorFormat2, 8); + +struct AnchorFormat3 { + + friend struct Anchor; + + private: + inline void get_anchor (hb_ot_layout_t *layout, hb_codepoint_t glyph_id, + hb_position_t *x, hb_position_t *y) const { + /* TODO Device */ + *x += layout->gpos_info.x_scale * xCoordinate / 0x10000; + *y += layout->gpos_info.y_scale * yCoordinate / 0x10000; + } + + private: + 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) */ +}; +ASSERT_SIZE (AnchorFormat3, 10); + +struct Anchor { + + inline void get_anchor (hb_ot_layout_t *layout, 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 (layout, glyph_id, x, y); return; + case 2: u.format2->get_anchor (layout, glyph_id, x, y); return; + case 3: u.format3->get_anchor (layout, glyph_id, x, y); return; + default: return; + } + } + + private: + union { + USHORT format; /* Format identifier */ + AnchorFormat1 format1[]; + AnchorFormat2 format2[]; + AnchorFormat3 format3[]; + } u; +}; +ASSERT_SIZE (Anchor, 2); + + +struct MarkRecord { + /* TODO */ + + private: + USHORT klass; /* Class defined for this mark */ + OffsetTo + markAnchor; /* Offset to Anchor table--from + * beginning of MarkArray table */ +}; +ASSERT_SIZE (MarkRecord, 4); + +struct MarkArray { + /* TODO */ + + private: + ArrayOf + markRecord; /* Array of MarkRecords--in Coverage order */ +}; +ASSERT_SIZE (MarkArray, 2); + + +/* Lookups */ + +struct SinglePosFormat1 { + + friend struct SinglePos; + + private: + inline bool position (LOOKUP_ARGS_DEF) const { + /* TODO */ + return false; + } + + private: + USHORT format; /* Format identifier--format = 1 */ + OffsetTo + coverage; /* Offset to Coverage table--from + * beginning of subtable */ + USHORT valueFormat; /* Defines the types of data in the + * ValueRecord */ + ValueRecord values; /* Defines positioning + * value(s)--applied to all glyphs in + * the Coverage table */ +}; +ASSERT_SIZE (SinglePosFormat1, 6); + +struct SinglePosFormat2 { + + friend struct SinglePos; + + private: + inline bool position (LOOKUP_ARGS_DEF) const { + /* TODO */ + return false; + } + + private: + USHORT format; /* Format identifier--format = 2 */ + OffsetTo + coverage; /* Offset to Coverage table--from + * beginning of subtable */ + USHORT valueFormat; /* Defines the types of data in the + * ValueRecord */ + USHORT valueCount; /* Number of ValueRecords */ + ValueRecord values; /* Array of ValueRecords--positioning + * values applied to glyphs */ +}; +ASSERT_SIZE (SinglePosFormat2, 8); + +struct SinglePos { + + friend struct PosLookupSubTable; + + private: + + inline bool position (LOOKUP_ARGS_DEF) const { + switch (u.format) { + case 1: return u.format1->position (LOOKUP_ARGS); + case 2: return u.format2->position (LOOKUP_ARGS); + default:return false; + } + } + + private: + union { + USHORT format; /* Format identifier */ + SinglePosFormat1 format1[]; + SinglePosFormat2 format2[]; + } u; +}; +ASSERT_SIZE (SinglePos, 2); + + +struct PairValueRecord { + /* TODO */ + + 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 */ +}; +ASSERT_SIZE (PairValueRecord, 2); + +/* XXXXXXXXXXXXXXXXXXXX */ +typedef ArrayOf PairSet; +ASSERT_SIZE (PairSet, 2); + +struct PairPosFormat1 { + + friend struct PairPos; + + private: + inline bool position (LOOKUP_ARGS_DEF) const { + /* TODO */ + return false; + } + + private: + USHORT format; /* Format identifier--format = 1 */ + OffsetTo + coverage; /* Offset to Coverage table--from + * beginning of subtable */ + USHORT valueFormat1; /* Defines the types of data in + * ValueRecord1--for the first glyph + * in the pair--may be zero (0) */ + USHORT 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 */ +}; +ASSERT_SIZE (PairPosFormat1, 10); + +struct PairPosFormat2 { + + friend struct PairPos; + + private: + inline bool position (LOOKUP_ARGS_DEF) const { + /* TODO */ + return false; + } + + private: + USHORT format; /* Format identifier--format = 2 */ + OffsetTo + coverage; /* Offset to Coverage table--from + * beginning of subtable */ + USHORT valueFormat1; /* ValueRecord definition--for the + * first glyph of the pair--may be zero + * (0) */ + USHORT 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 */ +}; +ASSERT_SIZE (PairPosFormat2, 16); + +struct PairPos { + + friend struct PosLookupSubTable; + + private: + + inline bool position (LOOKUP_ARGS_DEF) const { + switch (u.format) { + case 1: return u.format1->position (LOOKUP_ARGS); + case 2: return u.format2->position (LOOKUP_ARGS); + default:return false; + } + } + + private: + union { + USHORT format; /* Format identifier */ + PairPosFormat1 format1[]; + PairPosFormat2 format2[]; + } u; +}; +ASSERT_SIZE (PairPos, 2); + + +struct EntryExitRecord { + /* TODO */ + + private: + 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 */ +}; +ASSERT_SIZE (EntryExitRecord, 4); + +struct CursivePosFormat1 { + + friend struct CursivePos; + + private: + inline bool position (LOOKUP_ARGS_DEF) const { + /* TODO */ + return false; + } + + private: + 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 */ +}; +ASSERT_SIZE (CursivePosFormat1, 6); + +struct CursivePos { + + friend struct PosLookupSubTable; + + private: + + inline bool position (LOOKUP_ARGS_DEF) const { + switch (u.format) { + case 1: return u.format1->position (LOOKUP_ARGS); + default:return false; + } + } + + private: + union { + USHORT format; /* Format identifier */ + CursivePosFormat1 format1[]; + } u; +}; +ASSERT_SIZE (CursivePos, 2); + + +struct BaseRecord { + /* TODO */ + + private: + Offset baseAnchor[]; /* Array of offsets (one per class) + * to Anchor tables--from beginning + * of BaseArray table--ordered by + * class--zero--based */ +}; +ASSERT_SIZE (BaseRecord, 0); + +struct BaseArray { + /* TODO */ + + private: + USHORT baseCount; /* Number of BaseRecords */ + BaseRecord baseRecord[]; /* Array of BaseRecords--in order of + * BaseCoverage Index */ +}; +ASSERT_SIZE (BaseArray, 2); + +struct MarkBasePosFormat1 { + + friend struct MarkBasePos; + + private: + inline bool position (LOOKUP_ARGS_DEF) const { + /* TODO */ + return false; + } + + private: + USHORT format; /* Format identifier--format = 1 */ + Offset markCoverage; /* Offset to MarkCoverage table--from + * beginning of MarkBasePos subtable */ + Offset baseCoverage; /* Offset to BaseCoverage table--from + * beginning of MarkBasePos subtable */ + USHORT classCount; /* Number of classes defined for marks */ + Offset markArray; /* Offset to MarkArray table--from + * beginning of MarkBasePos subtable */ + /* XXXXXXXXXXXXX */ + Offset baseArray; /* Offset to BaseArray table--from + * beginning of MarkBasePos subtable */ +}; +ASSERT_SIZE (MarkBasePosFormat1, 12); + +struct MarkBasePos { + + friend struct PosLookupSubTable; + + private: + + inline bool position (LOOKUP_ARGS_DEF) const { + switch (u.format) { + case 1: return u.format1->position (LOOKUP_ARGS); + default:return false; + } + } + + private: + union { + USHORT format; /* Format identifier */ + MarkBasePosFormat1 format1[]; + } u; +}; +ASSERT_SIZE (MarkBasePos, 2); + + +struct ComponentRecord { + /* TODO */ + + private: + OffsetTo + ligatureAnchor[]; /* Array of offsets (one per class) + * to Anchor tables--from beginning + * of LigatureAttach table--ordered + * by class--NULL if a component + * does not have an attachment for a + * class--zero--based array */ +}; +ASSERT_SIZE (ComponentRecord, 0); + +struct LigatureAttach { + /* TODO */ + + private: + /* XXXXXXXXXXXXX */ + USHORT componentCount; /* Number of ComponentRecords in this + * ligature */ + ComponentRecord + componentRecord[]; /* Array of ComponentRecords--ordered + * in writing direction */ +}; +ASSERT_SIZE (LigatureAttach, 2); + +struct LigatureArray { + /* TODO */ + + private: + OffsetArrayOf + ligatureAttach; /* Array of LigatureAttach + * tables ordered by + * LigatureCoverage Index */ +}; +ASSERT_SIZE (LigatureArray, 2); + +struct MarkLigPosFormat1 { + + friend struct MarkLigPos; + + private: + inline bool position (LOOKUP_ARGS_DEF) const { + /* TODO */ + return false; + } + + private: + USHORT format; /* Format identifier--format = 1 */ + Offset markCoverage; /* Offset to Mark Coverage table--from + * beginning of MarkLigPos subtable */ + Offset ligatureCoverage; /* Offset to Ligature Coverage + * table--from beginning of MarkLigPos + * subtable */ + USHORT classCount; /* Number of defined mark classes */ + Offset markArray; /* Offset to MarkArray table--from + * beginning of MarkLigPos subtable */ + Offset ligatureArray; /* Offset to LigatureArray table--from + * beginning of MarkLigPos subtable */ +}; +ASSERT_SIZE (MarkLigPosFormat1, 12); + +struct MarkLigPos { + + friend struct PosLookupSubTable; + + private: + + inline bool position (LOOKUP_ARGS_DEF) const { + switch (u.format) { + case 1: return u.format1->position (LOOKUP_ARGS); + default:return false; + } + } + + private: + union { + USHORT format; /* Format identifier */ + MarkLigPosFormat1 format1[]; + } u; +}; +ASSERT_SIZE (MarkLigPos, 2); + + +struct Mark2Record { + /* TODO */ + + private: + OffsetTo + mark2Anchor[]; /* Array of offsets (one per class) + * to Anchor tables--from beginning of + * Mark2Array table--zero--based array */ +}; + +struct Mark2Array { + /* TODO */ + + private: + USHORT mark2Count; /* Number of Mark2 records */ + Mark2Record mark2Record[]; /* Array of Mark2Records--in Coverage + * order */ +}; +ASSERT_SIZE (Mark2Array, 2); + +struct MarkMarkPosFormat1 { + + friend struct MarkMarkPos; + + private: + inline bool position (LOOKUP_ARGS_DEF) const { + /* TODO */ + return false; + } + + private: + USHORT format; /* Format identifier--format = 1 */ + Offset mark1Coverage; /* Offset to Combining Mark Coverage + * table--from beginning of MarkMarkPos + * subtable */ + Offset mark2Coverage; /* Offset to Base Mark Coverage + * table--from beginning of MarkMarkPos + * subtable */ + USHORT offset; /* Mark1Array */ + Offset mark2Array; /* Offset to Mark2Array table for + * Mark2--from beginning of MarkMarkPos + * subtable */ +}; +ASSERT_SIZE (MarkMarkPosFormat1, 10); + +struct MarkMarkPos { + + friend struct PosLookupSubTable; + + private: + + inline bool position (LOOKUP_ARGS_DEF) const { + switch (u.format) { + case 1: return u.format1->position (LOOKUP_ARGS); + default:return false; + } + } + + private: + union { + USHORT format; /* Format identifier */ + MarkMarkPosFormat1 format1[]; + } u; +}; +ASSERT_SIZE (MarkMarkPos, 2); + + +static inline bool position_lookup (LOOKUP_ARGS_DEF, unsigned int lookup_index); + +struct ContextPos : Context { + + inline bool position (LOOKUP_ARGS_DEF) const { + return this->apply (LOOKUP_ARGS, position_lookup); + } +}; +ASSERT_SIZE (ContextPos, 2); + +struct ChainContextPos : ChainContext { + + inline bool position (LOOKUP_ARGS_DEF) const { + return this->apply (LOOKUP_ARGS, position_lookup); + } +}; +ASSERT_SIZE (ChainContextPos, 2); + + +struct ExtensionPosFormat1 { + + friend struct ExtensionPos; + + private: + inline unsigned int get_type (void) const { return extensionLookupType; } + inline unsigned int get_offset (void) const { return (extensionOffset[0] << 16) + extensionOffset[1]; } + inline bool position (LOOKUP_ARGS_DEF) const; + + private: + USHORT format; /* Format identifier. Set to 1. */ + USHORT extensionLookupType; /* Lookup type of subtable referenced + * by ExtensionOffset (i.e. the + * extension subtable). */ + USHORT extensionOffset[2]; /* Offset to the extension subtable, + * of lookup type subtable. + * Defined as two shorts to avoid + * alignment requirements. */ +}; +ASSERT_SIZE (ExtensionPosFormat1, 8); + +struct ExtensionPos { + + friend struct PosLookup; + friend struct PosLookupSubTable; + + private: + + inline unsigned int get_type (void) const { + switch (u.format) { + case 1: return u.format1->get_type (); + default:return 0; + } + } + + inline bool position (LOOKUP_ARGS_DEF) const { + switch (u.format) { + case 1: return u.format1->position (LOOKUP_ARGS); + default:return false; + } + } + + private: + union { + USHORT format; /* Format identifier */ + ExtensionPosFormat1 format1[]; + } u; +}; +ASSERT_SIZE (ExtensionPos, 2); + + +/* + * PosLookup + */ + +enum { + GPOS_Single = 1, + GPOS_Pair = 2, + GPOS_Cursive = 3, + GPOS_MarkBase = 4, + GPOS_MarkLig = 5, + GPOS_MarkMark = 6, + GPOS_Context = 7, + GPOS_ChainContext = 8, + GPOS_Extension = 9, +}; + + +struct PosLookupSubTable { + + friend struct PosLookup; + + inline bool position (LOOKUP_ARGS_DEF, unsigned int lookup_type) const { + + switch (lookup_type) { + case GPOS_Single: return u.single->position (LOOKUP_ARGS); + case GPOS_Pair: return u.pair->position (LOOKUP_ARGS); + case GPOS_Cursive: return u.cursive->position (LOOKUP_ARGS); + case GPOS_MarkBase: return u.markBase->position (LOOKUP_ARGS); + case GPOS_MarkLig: return u.markLig->position (LOOKUP_ARGS); + case GPOS_MarkMark: return u.markMark->position (LOOKUP_ARGS); + case GPOS_Context: return u.context->position (LOOKUP_ARGS); + case GPOS_ChainContext: return u.chainContext->position (LOOKUP_ARGS); + case GPOS_Extension: return u.extension->position (LOOKUP_ARGS); + default:return false; + } + } + + private: + union { + USHORT format; + SinglePos single[]; + PairPos pair[]; + CursivePos cursive[]; + MarkBasePos markBase[]; + MarkLigPos markLig[]; + MarkMarkPos markMark[]; + ContextPos context[]; + ChainContextPos chainContext[]; + ExtensionPos extension[]; + } u; +}; +ASSERT_SIZE (PosLookupSubTable, 2); + + +struct PosLookup : Lookup { + + inline const PosLookupSubTable& get_subtable (unsigned int i) const { + return *(PosLookupSubTable*)&(((Lookup *)this)->get_subtable (i)); + } + + /* Like get_type(), but looks through extension lookups. + * Never returns Extension */ + inline unsigned int get_effective_type (void) const { + unsigned int type = get_type (); + + if (HB_UNLIKELY (type == GPOS_Extension)) { + unsigned int count = get_subtable_count (); + type = get_subtable(0).u.extension->get_type (); + /* The spec says all subtables should have the same type. + * This is specially important if one has a reverse type! */ + for (unsigned int i = 1; i < count; i++) + if (get_subtable(i).u.extension->get_type () != type) + return 0; + } + + return type; + } + + inline bool position_subtables (hb_ot_layout_t *layout, + hb_buffer_t *buffer, + unsigned int context_length, + unsigned int nesting_level_left, + unsigned int property) const { + unsigned int lookup_type = get_type (); + unsigned int lookup_flag = get_flag (); + + for (unsigned int i = 0; i < get_subtable_count (); i++) + if (get_subtable (i).position (LOOKUP_ARGS, lookup_type)) + return true; + + return false; + } + + inline bool position_once (hb_ot_layout_t *layout, hb_buffer_t *buffer) const { + + unsigned int lookup_flag = get_flag (); + + unsigned int property; + if (!_hb_ot_layout_check_glyph_property (layout, IN_CURITEM (), lookup_flag, &property)) + return false; + + return position_subtables (layout, buffer, NO_CONTEXT, MAX_NESTING_LEVEL, property); + } + + bool position_string (hb_ot_layout_t *layout, + hb_buffer_t *buffer, + hb_ot_layout_feature_mask_t mask) const { + + bool ret = false; + + if (HB_UNLIKELY (!buffer->in_length)) + return false; + + _hb_buffer_clear_positions (buffer); + buffer->in_pos = 0; + while (buffer->in_pos < buffer->in_length) { + + if ((~IN_PROPERTIES (buffer->in_pos) & mask) && + position_once (layout, buffer)) + ret = true; + else + _hb_buffer_next_glyph (buffer); + + } + + return ret; + } +}; +ASSERT_SIZE (PosLookup, 6); + + +/* + * GPOS + */ + +struct GPOS : GSUBGPOS { + static const hb_tag_t Tag = HB_TAG ('G','P','O','S'); + + STATIC_DEFINE_GET_FOR_DATA (GPOS); + /* XXX check version here? */ + + inline const PosLookup& get_lookup (unsigned int i) const { + return *(PosLookup*)&(((GSUBGPOS *)this)->get_lookup (i)); + } + + inline bool position_lookup (hb_ot_layout_t *layout, + hb_buffer_t *buffer, + unsigned int lookup_index, + hb_ot_layout_feature_mask_t mask) const { + return get_lookup (lookup_index).position_string (layout, buffer, mask); + } + +}; +ASSERT_SIZE (GPOS, 10); + + +/* Out-of-class implementation for methods recursing */ + +inline bool ExtensionPosFormat1::position (LOOKUP_ARGS_DEF) const { + unsigned int lookup_type = get_type (); + + if (HB_UNLIKELY (lookup_type == GPOS_Extension)) + return false; + + return (*(PosLookupSubTable *)(((char *) this) + get_offset ())).position (LOOKUP_ARGS, lookup_type); +} + +static inline bool position_lookup (LOOKUP_ARGS_DEF, unsigned int lookup_index) { + const GPOS &gpos = *(layout->gpos); + const PosLookup &l = gpos.get_lookup (lookup_index); + + if (HB_UNLIKELY (nesting_level_left == 0)) + return false; + nesting_level_left--; + + if (HB_UNLIKELY (context_length < 1)) + return false; + + return l.position_subtables (layout, buffer, context_length, nesting_level_left, property); +} + + +#endif /* HB_OT_LAYOUT_GPOS_PRIVATE_H */ diff --git a/src/hb-ot-layout-gsub-private.h b/src/hb-ot-layout-gsub-private.h index 2f3dd6f..2bbb81f 100644 --- a/src/hb-ot-layout-gsub-private.h +++ b/src/hb-ot-layout-gsub-private.h @@ -469,7 +469,6 @@ ASSERT_SIZE (LigatureSubst, 2); static inline bool substitute_lookup (LOOKUP_ARGS_DEF, unsigned int lookup_index); - struct ContextSubst : Context { inline bool substitute (LOOKUP_ARGS_DEF) const { @@ -478,7 +477,6 @@ struct ContextSubst : Context { }; ASSERT_SIZE (ContextSubst, 2); - struct ChainContextSubst : ChainContext { inline bool substitute (LOOKUP_ARGS_DEF) const { diff --git a/src/hb-ot-layout-private.h b/src/hb-ot-layout-private.h index 0255355..540145b 100644 --- a/src/hb-ot-layout-private.h +++ b/src/hb-ot-layout-private.h @@ -39,12 +39,25 @@ typedef unsigned int hb_ot_layout_class_t; struct _hb_ot_layout_t { const struct GDEF *gdef; const struct GSUB *gsub; - const struct /*XXX*/GSUBGPOS *gpos; + const struct GPOS *gpos; struct { unsigned char *klasses; unsigned int len; } new_gdef; + + /* TODO full-matrix transformation? */ + struct { + unsigned int x_ppem, y_ppem; + hb_16dot16_t x_scale, y_scale; + + hb_bool_t dvi; + hb_bool_t r2l; + + unsigned int last; /* the last valid glyph--used with cursive positioning */ + hb_position_t anchor_x; /* the coordinates of the anchor point */ + hb_position_t anchor_y; /* of the last valid glyph */ + } gpos_info; }; diff --git a/src/hb-ot-layout.cc b/src/hb-ot-layout.cc index 6804a08..46f4555 100644 --- a/src/hb-ot-layout.cc +++ b/src/hb-ot-layout.cc @@ -34,6 +34,7 @@ #include "hb-ot-layout-open-private.h" #include "hb-ot-layout-gdef-private.h" #include "hb-ot-layout-gsub-private.h" +#include "hb-ot-layout-gpos-private.h" /* XXX */ #include "harfbuzz-buffer-private.h" @@ -49,7 +50,7 @@ hb_ot_layout_create (void) layout->gdef = &Null(GDEF); layout->gsub = &Null(GSUB); - layout->gpos = &/*XXX*/Null(GSUBGPOS); + layout->gpos = &Null(GPOS); return layout; } @@ -70,7 +71,7 @@ hb_ot_layout_create_for_data (const char *font_data, layout->gdef = &GDEF::get_for_data (font.get_table_data (face.get_table_by_tag (GDEF::Tag))); layout->gsub = &GSUB::get_for_data (font.get_table_data (face.get_table_by_tag (GSUB::Tag))); - layout->gpos = &/*XXX*/GSUBGPOS::get_for_data (font.get_table_data (face.get_table_by_tag (/*XXX*/GSUBGPOS::GPOSTag))); + layout->gpos = &GPOS::get_for_data (font.get_table_data (face.get_table_by_tag (GPOS::Tag))); return layout; } diff --git a/src/hb-ot-layout.h b/src/hb-ot-layout.h index 3ec4bed..f6c0c44 100644 --- a/src/hb-ot-layout.h +++ b/src/hb-ot-layout.h @@ -124,10 +124,10 @@ hb_ot_layout_table_get_feature_tag (hb_ot_layout_t *layout, unsigned int feature_index); hb_bool_t -hb_ot_layout_table_find_script (hb_ot_layout_t *layout, - hb_ot_layout_table_type_t table_type, - hb_tag_t feature_tag, - unsigned int *feature_index); +hb_ot_layout_table_find_feature (hb_ot_layout_t *layout, + hb_ot_layout_table_type_t table_type, + hb_tag_t feature_tag, + unsigned int *feature_index); unsigned int hb_ot_layout_table_get_lookup_count (hb_ot_layout_t *layout,