The Tor Browser: gfx/graphite2/src/inc/Segment.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /*  GRAPHITE2 LICENSING

     3     Copyright 2010, SIL International

     4     All rights reserved.

     6     This library is free software; you can redistribute it and/or modify

     7     it under the terms of the GNU Lesser General Public License as published

     8     by the Free Software Foundation; either version 2.1 of License, or

     9     (at your option) any later version.

    11     This program is distributed in the hope that it will be useful,

    12     but WITHOUT ANY WARRANTY; without even the implied warranty of

    13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    14     Lesser General Public License for more details.

    16     You should also have received a copy of the GNU Lesser General Public

    17     License along with this library in the file named "LICENSE".

    18     If not, write to the Free Software Foundation, 51 Franklin Street,

    19     Suite 500, Boston, MA 02110-1335, USA or visit their web page on the

    20     internet at http://www.fsf.org/licenses/lgpl.html.

    22 Alternatively, the contents of this file may be used under the terms of the

    23 Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public

    24 License, as published by the Free Software Foundation, either version 2

    25 of the License or (at your option) any later version.

    26 */

    27 #pragma once

    29 #include "inc/Main.h"

    31 #include <cassert>

    33 #include "inc/CharInfo.h"

    34 #include "inc/Face.h"

    35 #include "inc/FeatureVal.h"

    36 #include "inc/GlyphCache.h"

    37 #include "inc/GlyphFace.h"

    38 //#include "inc/Silf.h"

    39 #include "inc/Slot.h"

    40 #include "inc/Position.h"

    41 #include "inc/List.h"

    42 #include "inc/Bidi.h"

    44 #define MAX_SEG_GROWTH_FACTOR  256

    46 namespace graphite2 {

    48 typedef Vector<Features>        FeatureList;

    49 typedef Vector<Slot *>          SlotRope;

    50 typedef Vector<int16 *>        AttributeRope;

    51 typedef Vector<SlotJustify *>   JustifyRope;

    53 #ifndef GRAPHITE2_NSEGCACHE

    54 class SegmentScopeState;

    55 #endif

    56 class Font;

    57 class Segment;

    58 class Silf;

    60 enum SpliceParam {

    61 /** sub-Segments longer than this are not cached

    62  * (in Unicode code points) */

    63     eMaxSpliceSize = 96

    64 };

    66 enum justFlags {

    67     gr_justStartInline = 1,

    68     gr_justEndInline = 2

    69 };

    71 class SegmentScopeState

    72 {

    73 private:

    74     friend class Segment;

    75     Slot * realFirstSlot;

    76     Slot * slotBeforeScope;

    77     Slot * slotAfterScope;

    78     Slot * realLastSlot;

    79     size_t numGlyphsOutsideScope;

    80 };

    82 class Segment

    83 {

    84     // Prevent copying of any kind.

    85     Segment(const Segment&);

    86     Segment& operator=(const Segment&);

    88 public:

    89     unsigned int slotCount() const { return m_numGlyphs; }      //one slot per glyph

    90     void extendLength(int num) { m_numGlyphs += num; }

    91     Position advance() const { return m_advance; }

    92     bool runGraphite() { if (m_silf) return m_face->runGraphite(this, m_silf); else return true;};

    93     void chooseSilf(uint32 script) { m_silf = m_face->chooseSilf(script); }

    94     const Silf *silf() const { return m_silf; }

    95     unsigned int charInfoCount() const { return m_numCharinfo; }

    96     const CharInfo *charinfo(unsigned int index) const { return index < m_numCharinfo ? m_charinfo + index : NULL; }

    97     CharInfo *charinfo(unsigned int index) { return index < m_numCharinfo ? m_charinfo + index : NULL; }

    98     int8 dir() const { return m_dir; }

   100     Segment(unsigned int numchars, const Face* face, uint32 script, int dir);

   101     ~Segment();

   102 #ifndef GRAPHITE2_NSEGCACHE

   103     SegmentScopeState setScope(Slot * firstSlot, Slot * lastSlot, size_t subLength);

   104     void removeScope(SegmentScopeState & state);

   105     void append(const Segment &other);

   106     void splice(size_t offset, size_t length, Slot * const startSlot,

   107             Slot * endSlot, const Slot * srcSlot,

   108             const size_t numGlyphs);

   109 #endif

   110     Slot *first() { return m_first; }

   111     void first(Slot *p) { m_first = p; }

   112     Slot *last() { return m_last; }

   113     void last(Slot *p) { m_last = p; }

   114     void appendSlot(int i, int cid, int gid, int fid, size_t coffset);

   115     Slot *newSlot();

   116     void freeSlot(Slot *);

   117     SlotJustify *newJustify();

   118     void freeJustify(SlotJustify *aJustify);

   119     Position positionSlots(const Font *font, Slot *first=0, Slot *last=0);

   120     void associateChars(int offset, int num);

   121     void linkClusters(Slot *first, Slot *last);

   122     uint16 getClassGlyph(uint16 cid, uint16 offset) const { return m_silf->getClassGlyph(cid, offset); }

   123     uint16 findClassIndex(uint16 cid, uint16 gid) const { return m_silf->findClassIndex(cid, gid); }

   124     int addFeatures(const Features& feats) { m_feats.push_back(feats); return m_feats.size() - 1; }

   125     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]); }

   126     void dir(int8 val) { m_dir = val; }

   127     unsigned int passBits() const { return m_passBits; }

   128     void mergePassBits(const unsigned int val) { m_passBits &= val; }

   129     int16 glyphAttr(uint16 gid, uint16 gattr) const { const GlyphFace * p = m_face->glyphs().glyphSafe(gid); return p ? p->attrs()[gattr] : 0; }

   130     int32 getGlyphMetric(Slot *iSlot, uint8 metric, uint8 attrLevel) const;

   131     float glyphAdvance(uint16 gid) const { return m_face->glyphs().glyph(gid)->theAdvance().x; }

   132     const Rect &theGlyphBBoxTemporary(uint16 gid) const { return m_face->glyphs().glyph(gid)->theBBox(); }   //warning value may become invalid when another glyph is accessed

   133     Slot *findRoot(Slot *is) const { return is->attachedTo() ? findRoot(is->attachedTo()) : is; }

   134     int numAttrs() const { return m_silf->numUser(); }

   135     int defaultOriginal() const { return m_defaultOriginal; }

   136     const Face * getFace() const { return m_face; }

   137     const Features & getFeatures(unsigned int /*charIndex*/) { assert(m_feats.size() == 1); return m_feats[0]; }

   138     void bidiPass(uint8 aBidi, int paradir, uint8 aMirror);

   139     Slot *addLineEnd(Slot *nSlot);

   140     void delLineEnd(Slot *s);

   141     bool hasJustification() const { return m_justifies.size() != 0; }

   143     bool isWhitespace(const int cid) const;

   145     CLASS_NEW_DELETE

   147 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);

   148     bool read_text(const Face *face, const Features* pFeats/*must not be NULL*/, gr_encform enc, const void*pStart, size_t nChars);

   149     void prepare_pos(const Font *font);

   150     void finalise(const Font *font);

   151     float justify(Slot *pSlot, const Font *font, float width, enum justFlags flags, Slot *pFirst, Slot *pLast);

   153 private:

   154     Position        m_advance;          // whole segment advance

   155     SlotRope        m_slots;            // Vector of slot buffers

   156     AttributeRope   m_userAttrs;        // Vector of userAttrs buffers

   157     JustifyRope     m_justifies;        // Slot justification info buffers

   158     FeatureList     m_feats;            // feature settings referenced by charinfos in this segment

   159     Slot          * m_freeSlots;        // linked list of free slots

   160     SlotJustify   * m_freeJustifies;    // Slot justification blocks free list

   161     CharInfo      * m_charinfo;         // character info, one per input character

   162     const Face    * m_face;             // GrFace

   163     const Silf    * m_silf;

   164     Slot          * m_first;            // first slot in segment

   165     Slot          * m_last;             // last slot in segment

   166     unsigned int    m_bufSize,          // how big a buffer to create when need more slots

   167                     m_numGlyphs,

   168                     m_numCharinfo,      // size of the array and number of input characters

   169                     m_passBits;         // if bit set then skip pass

   170     int             m_defaultOriginal;  // number of whitespace chars in the string

   171     int8            m_dir;

   172 };

   176 inline

   177 void Segment::finalise(const Font *font)

   178 {

   179     if (!m_first) return;

   181     m_advance = positionSlots(font);

   182     associateChars(0, m_numCharinfo);

   183     linkClusters(m_first, m_last);

   184 }

   186 inline

   187 int32 Segment::getGlyphMetric(Slot *iSlot, uint8 metric, uint8 attrLevel) const {

   188     if (attrLevel > 0)

   189     {

   190         Slot *is = findRoot(iSlot);

   191         return is->clusterMetric(this, metric, attrLevel);

   192     }

   193     else

   194         return m_face->getGlyphMetric(iSlot->gid(), metric);

   195 }

   197 inline

   198 bool Segment::isWhitespace(const int cid) const

   199 {

   200     return ((cid >= 0x0009) * (cid <= 0x000D)

   201          + (cid == 0x0020)

   202          + (cid == 0x0085)

   203          + (cid == 0x00A0)

   204          + (cid == 0x1680)

   205          + (cid == 0x180E)

   206          + (cid >= 0x2000) * (cid <= 0x200A)

   207          + (cid == 0x2028)

   208          + (cid == 0x2029)

   209          + (cid == 0x202F)

   210          + (cid == 0x205F)

   211          + (cid == 0x3000)) != 0;

   212 }

   214 //inline

   215 //bool Segment::isWhitespace(const int cid) const

   216 //{

   217 //    switch (cid >> 8)

   218 //    {

   219 //        case 0x00:

   220 //            switch (cid)

   221 //            {

   222 //            case 0x09:

   223 //            case 0x0A:

   224 //            case 0x0B:

   225 //            case 0x0C:

   226 //            case 0x0D:

   227 //            case 0x20:

   228 //                return true;

   229 //            default:

   230 //                break;

   231 //            }

   232 //            break;

   233 //        case 0x16:

   234 //            return cid == 0x1680;

   235 //            break;

   236 //        case 0x18:

   237 //            return cid == 0x180E;

   238 //            break;

   239 //        case 0x20:

   240 //            switch (cid)

   241 //            {

   242 //            case 0x00:

   243 //            case 0x01:

   244 //            case 0x02:

   245 //            case 0x03:

   246 //            case 0x04:

   247 //            case 0x05:

   248 //            case 0x06:

   249 //            case 0x07:

   250 //            case 0x08:

   251 //            case 0x09:

   252 //            case 0x0A:

   253 //            case 0x28:

   254 //            case 0x29:

   255 //            case 0x2F:

   256 //            case 0x5F:

   257 //                return true

   258 //            default:

   259 //                break;

   260 //            }

   261 //            break;

   262 //        case 0x30:

   263 //            return cid == 0x3000;

   264 //            break;

   265 //    }

   266 //

   267 //    return false;

   268 //}

   270 } // namespace graphite2

   272 struct gr_segment : public graphite2::Segment {};

The Tor Browser / file revision

gfx/graphite2/src/inc/Segment.h@b8a032363ba2

gfx/graphite2/src/inc/Segment.h