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// SPDX-License-Identifier: MIT OR MPL-2.0 OR LGPL-2.1-or-later OR GPL-2.0-or-later
// Copyright 2010, SIL International, All rights reserved.
#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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