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Diffstat (limited to 'thirdparty/graphite/src/inc/Segment.h')
| -rw-r--r-- | thirdparty/graphite/src/inc/Segment.h | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/thirdparty/graphite/src/inc/Segment.h b/thirdparty/graphite/src/inc/Segment.h new file mode 100644 index 0000000000..6cf83408d4 --- /dev/null +++ b/thirdparty/graphite/src/inc/Segment.h @@ -0,0 +1,236 @@ +/* GRAPHITE2 LICENSING + + Copyright 2010, SIL International + All rights reserved. + + This library is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as published + by the Free Software Foundation; either version 2.1 of License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should also have received a copy of the GNU Lesser General Public + License along with this library in the file named "LICENSE". + If not, write to the Free Software Foundation, 51 Franklin Street, + Suite 500, Boston, MA 02110-1335, USA or visit their web page on the + internet at http://www.fsf.org/licenses/lgpl.html. + +Alternatively, the contents of this file may be used under the terms of the +Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public +License, as published by the Free Software Foundation, either version 2 +of the License or (at your option) any later version. +*/ +#pragma once + +#include "inc/Main.h" + +#include <cassert> + +#include "inc/CharInfo.h" +#include "inc/Face.h" +#include "inc/FeatureVal.h" +#include "inc/GlyphCache.h" +#include "inc/GlyphFace.h" +#include "inc/Slot.h" +#include "inc/Position.h" +#include "inc/List.h" +#include "inc/Collider.h" + +#define MAX_SEG_GROWTH_FACTOR 64 + +namespace graphite2 { + +typedef Vector<Features> FeatureList; +typedef Vector<Slot *> SlotRope; +typedef Vector<int16 *> AttributeRope; +typedef Vector<SlotJustify *> JustifyRope; + +class Font; +class Segment; +class Silf; + +enum SpliceParam { +/** sub-Segments longer than this are not cached + * (in Unicode code points) */ + eMaxSpliceSize = 96 +}; + +enum justFlags { + gr_justStartInline = 1, + gr_justEndInline = 2 +}; + +class SegmentScopeState +{ +private: + friend class Segment; + Slot * realFirstSlot; + Slot * slotBeforeScope; + Slot * slotAfterScope; + Slot * realLastSlot; + size_t numGlyphsOutsideScope; +}; + +class Segment +{ + // Prevent copying of any kind. + Segment(const Segment&); + Segment& operator=(const Segment&); + +public: + + enum { + SEG_INITCOLLISIONS = 1, + SEG_HASCOLLISIONS = 2 + }; + + size_t slotCount() const { return m_numGlyphs; } //one slot per glyph + void extendLength(ptrdiff_t num) { m_numGlyphs += num; } + Position advance() const { return m_advance; } + bool runGraphite() { if (m_silf) return m_face->runGraphite(this, m_silf); else return true;}; + void chooseSilf(uint32 script) { m_silf = m_face->chooseSilf(script); } + const Silf *silf() const { return m_silf; } + size_t charInfoCount() const { return m_numCharinfo; } + const CharInfo *charinfo(unsigned int index) const { return index < m_numCharinfo ? m_charinfo + index : NULL; } + CharInfo *charinfo(unsigned int index) { return index < m_numCharinfo ? m_charinfo + index : NULL; } + + Segment(size_t numchars, const Face* face, uint32 script, int dir); + ~Segment(); + uint8 flags() const { return m_flags; } + void flags(uint8 f) { m_flags = f; } + Slot *first() { return m_first; } + void first(Slot *p) { m_first = p; } + Slot *last() { return m_last; } + void last(Slot *p) { m_last = p; } + void appendSlot(int i, int cid, int gid, int fid, size_t coffset); + Slot *newSlot(); + void freeSlot(Slot *); + SlotJustify *newJustify(); + void freeJustify(SlotJustify *aJustify); + Position positionSlots(const Font *font=0, Slot *first=0, Slot *last=0, bool isRtl = false, bool isFinal = true); + void associateChars(int offset, size_t num); + void linkClusters(Slot *first, Slot *last); + uint16 getClassGlyph(uint16 cid, uint16 offset) const { return m_silf->getClassGlyph(cid, offset); } + uint16 findClassIndex(uint16 cid, uint16 gid) const { return m_silf->findClassIndex(cid, gid); } + int addFeatures(const Features& feats) { m_feats.push_back(feats); return int(m_feats.size()) - 1; } + uint32 getFeature(int index, uint8 findex) const { const FeatureRef* pFR=m_face->theSill().theFeatureMap().featureRef(findex); if (!pFR) return 0; else return pFR->getFeatureVal(m_feats[index]); } + void setFeature(int index, uint8 findex, uint32 val) { + const FeatureRef* pFR=m_face->theSill().theFeatureMap().featureRef(findex); + if (pFR) + { + if (val > pFR->maxVal()) val = pFR->maxVal(); + pFR->applyValToFeature(val, m_feats[index]); + } } + int8 dir() const { return m_dir; } + void dir(int8 val) { m_dir = val; } + bool currdir() const { return ((m_dir >> 6) ^ m_dir) & 1; } + uint8 passBits() const { return m_passBits; } + void mergePassBits(const uint8 val) { m_passBits &= val; } + int16 glyphAttr(uint16 gid, uint16 gattr) const { const GlyphFace * p = m_face->glyphs().glyphSafe(gid); return p ? p->attrs()[gattr] : 0; } + int32 getGlyphMetric(Slot *iSlot, uint8 metric, uint8 attrLevel, bool rtl) const; + float glyphAdvance(uint16 gid) const { return m_face->glyphs().glyph(gid)->theAdvance().x; } + const Rect &theGlyphBBoxTemporary(uint16 gid) const { return m_face->glyphs().glyph(gid)->theBBox(); } //warning value may become invalid when another glyph is accessed + Slot *findRoot(Slot *is) const { return is->attachedTo() ? findRoot(is->attachedTo()) : is; } + int numAttrs() const { return m_silf->numUser(); } + int defaultOriginal() const { return m_defaultOriginal; } + const Face * getFace() const { return m_face; } + const Features & getFeatures(unsigned int /*charIndex*/) { assert(m_feats.size() == 1); return m_feats[0]; } + void bidiPass(int paradir, uint8 aMirror); + int8 getSlotBidiClass(Slot *s) const; + void doMirror(uint16 aMirror); + Slot *addLineEnd(Slot *nSlot); + void delLineEnd(Slot *s); + bool hasJustification() const { return m_justifies.size() != 0; } + void reverseSlots(); + + bool isWhitespace(const int cid) const; + bool hasCollisionInfo() const { return (m_flags & SEG_HASCOLLISIONS) && m_collisions; } + SlotCollision *collisionInfo(const Slot *s) const { return m_collisions ? m_collisions + s->index() : 0; } + CLASS_NEW_DELETE + +public: //only used by: GrSegment* makeAndInitialize(const GrFont *font, const GrFace *face, uint32 script, const FeaturesHandle& pFeats/*must not be IsNull*/, encform enc, const void* pStart, size_t nChars, int dir); + bool read_text(const Face *face, const Features* pFeats/*must not be NULL*/, gr_encform enc, const void*pStart, size_t nChars); + void finalise(const Font *font, bool reverse=false); + float justify(Slot *pSlot, const Font *font, float width, enum justFlags flags, Slot *pFirst, Slot *pLast); + bool initCollisions(); + +private: + Position m_advance; // whole segment advance + SlotRope m_slots; // Vector of slot buffers + AttributeRope m_userAttrs; // Vector of userAttrs buffers + JustifyRope m_justifies; // Slot justification info buffers + FeatureList m_feats; // feature settings referenced by charinfos in this segment + Slot * m_freeSlots; // linked list of free slots + SlotJustify * m_freeJustifies; // Slot justification blocks free list + CharInfo * m_charinfo; // character info, one per input character + SlotCollision * m_collisions; + const Face * m_face; // GrFace + const Silf * m_silf; + Slot * m_first; // first slot in segment + Slot * m_last; // last slot in segment + size_t m_bufSize, // how big a buffer to create when need more slots + m_numGlyphs, + m_numCharinfo; // size of the array and number of input characters + int m_defaultOriginal; // number of whitespace chars in the string + int8 m_dir; + uint8 m_flags, // General purpose flags + m_passBits; // if bit set then skip pass +}; + +inline +int8 Segment::getSlotBidiClass(Slot *s) const +{ + int8 res = s->getBidiClass(); + if (res != -1) return res; + res = int8(glyphAttr(s->gid(), m_silf->aBidi())); + s->setBidiClass(res); + return res; +} + +inline +void Segment::finalise(const Font *font, bool reverse) +{ + if (!m_first || !m_last) return; + + m_advance = positionSlots(font, m_first, m_last, m_silf->dir(), true); + //associateChars(0, m_numCharinfo); + if (reverse && currdir() != (m_dir & 1)) + reverseSlots(); + linkClusters(m_first, m_last); +} + +inline +int32 Segment::getGlyphMetric(Slot *iSlot, uint8 metric, uint8 attrLevel, bool rtl) const { + if (attrLevel > 0) + { + Slot *is = findRoot(iSlot); + return is->clusterMetric(this, metric, attrLevel, rtl); + } + else + return m_face->getGlyphMetric(iSlot->gid(), metric); +} + +inline +bool Segment::isWhitespace(const int cid) const +{ + return ((cid >= 0x0009) * (cid <= 0x000D) + + (cid == 0x0020) + + (cid == 0x0085) + + (cid == 0x00A0) + + (cid == 0x1680) + + (cid == 0x180E) + + (cid >= 0x2000) * (cid <= 0x200A) + + (cid == 0x2028) + + (cid == 0x2029) + + (cid == 0x202F) + + (cid == 0x205F) + + (cid == 0x3000)) != 0; +} + +} // namespace graphite2 + +struct gr_segment : public graphite2::Segment {}; |