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+/* 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 {};
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