summaryrefslogtreecommitdiff
path: root/Build/source/libs/graphite2/graphite2-src/src/Slot.cpp
blob: 551bec977e5adb6b9476a47beb0e765ff0129a5b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
/*  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.
*/
#include "inc/Segment.h"
#include "inc/Slot.h"
#include "inc/Silf.h"
#include "inc/CharInfo.h"
#include "inc/Rule.h"
#include "inc/Collider.h"


using namespace graphite2;

Slot::Slot(int16 *user_attrs) :
    m_next(NULL), m_prev(NULL),
    m_glyphid(0), m_realglyphid(0), m_original(0), m_before(0), m_after(0),
    m_index(0), m_parent(NULL), m_child(NULL), m_sibling(NULL),
    m_position(0, 0), m_shift(0, 0), m_advance(0, 0),
    m_attach(0, 0), m_with(0, 0), m_just(0.),
    m_flags(0), m_attLevel(0), m_bidiCls(-1), m_bidiLevel(0), 
    m_userAttr(user_attrs), m_justs(NULL)
{
}

// take care, this does not copy any of the GrSlot pointer fields
void Slot::set(const Slot & orig, int charOffset, size_t sizeAttr, size_t justLevels, size_t numChars)
{
    // leave m_next and m_prev unchanged
    m_glyphid = orig.m_glyphid;
    m_realglyphid = orig.m_realglyphid;
    m_original = orig.m_original + charOffset;
    if (charOffset + int(orig.m_before) < 0)
        m_before = 0;
    else
        m_before = orig.m_before + charOffset;
    if (charOffset <= 0 && orig.m_after + charOffset >= numChars)
        m_after = numChars - 1;
    else
        m_after = orig.m_after + charOffset;
    m_parent = NULL;
    m_child = NULL;
    m_sibling = NULL;
    m_position = orig.m_position;
    m_shift = orig.m_shift;
    m_advance = orig.m_advance;
    m_attach = orig.m_attach;
    m_with = orig.m_with;
    m_flags = orig.m_flags;
    m_attLevel = orig.m_attLevel;
    m_bidiCls = orig.m_bidiCls;
    m_bidiLevel = orig.m_bidiLevel;
    if (m_userAttr && orig.m_userAttr)
        memcpy(m_userAttr, orig.m_userAttr, sizeAttr * sizeof(*m_userAttr));
    if (m_justs && orig.m_justs)
        memcpy(m_justs, orig.m_justs, SlotJustify::size_of(justLevels));
}

void Slot::update(int /*numGrSlots*/, int numCharInfo, Position &relpos)
{
    m_before += numCharInfo;
    m_after += numCharInfo;
    m_position = m_position + relpos;
}

Position Slot::finalise(const Segment *seg, const Font *font, Position & base, Rect & bbox, uint8 attrLevel, float & clusterMin, bool rtl, bool isFinal)
{
    SlotCollision *coll = NULL;
    if (attrLevel && m_attLevel > attrLevel) return Position(0, 0);
    float scale = font ? font->scale() : 1.0f;
    Position shift(m_shift.x * (rtl * -2 + 1) + m_just, m_shift.y);
    float tAdvance = m_advance.x + m_just;
    if (isFinal && (coll = seg->collisionInfo(this)))
    {
        const Position &collshift = coll->offset();
        if (!(coll->flags() & SlotCollision::COLL_KERN) || rtl)
            shift = shift + collshift;
    }
    const GlyphFace * glyphFace = seg->getFace()->glyphs().glyphSafe(glyph());
    if (font)
    {
        scale = font->scale();
        shift *= scale;
        if (font->isHinted() && glyphFace)
            tAdvance = (m_advance.x - glyphFace->theAdvance().x + m_just) * scale + font->advance(glyph());
        else
            tAdvance *= scale;
    }    
    Position res;

    m_position = base + shift;
    if (!m_parent)
    {
        res = base + Position(tAdvance, m_advance.y * scale);
        clusterMin = m_position.x;
    }
    else
    {
        float tAdv;
        m_position += (m_attach - m_with) * scale;
        tAdv = m_advance.x >= 0.5f ? m_position.x + tAdvance - shift.x : 0.f;
        res = Position(tAdv, 0);
        if ((m_advance.x >= 0.5f || m_position.x < 0) && m_position.x < clusterMin) clusterMin = m_position.x;
    }

    if (glyphFace)
    {
        Rect ourBbox = glyphFace->theBBox() * scale + m_position;
        bbox = bbox.widen(ourBbox);
    }

    if (m_child && m_child != this && m_child->attachedTo() == this)
    {
        Position tRes = m_child->finalise(seg, font, m_position, bbox, attrLevel, clusterMin, rtl, isFinal);
        if ((!m_parent || m_advance.x >= 0.5f) && tRes.x > res.x) res = tRes;
    }

    if (m_parent && m_sibling && m_sibling != this && m_sibling->attachedTo() == m_parent)
    {
        Position tRes = m_sibling->finalise(seg, font, base, bbox, attrLevel, clusterMin, rtl, isFinal);
        if (tRes.x > res.x) res = tRes;
    }
    
    if (!m_parent && clusterMin < base.x)
    {
        Position adj = Position(m_position.x - clusterMin, 0.);
        res += adj;
        m_position += adj;
        if (m_child) m_child->floodShift(adj);
    }
    return res;
}

int32 Slot::clusterMetric(const Segment *seg, uint8 metric, uint8 attrLevel, bool rtl)
{
    Position base;
    if (glyph() >= seg->getFace()->glyphs().numGlyphs())
        return 0;
    Rect bbox = seg->theGlyphBBoxTemporary(glyph());
    float clusterMin = 0.;
    Position res = finalise(seg, NULL, base, bbox, attrLevel, clusterMin, rtl, false);

    switch (metrics(metric))
    {
    case kgmetLsb :
        return static_cast<uint32>(bbox.bl.x);
    case kgmetRsb :
        return static_cast<uint32>(res.x - bbox.tr.x);
    case kgmetBbTop :
        return static_cast<uint32>(bbox.tr.y);
    case kgmetBbBottom :
        return static_cast<uint32>(bbox.bl.y);
    case kgmetBbLeft :
        return static_cast<uint32>(bbox.bl.x);
    case kgmetBbRight :
        return static_cast<uint32>(bbox.tr.x);
    case kgmetBbWidth :
        return static_cast<uint32>(bbox.tr.x - bbox.bl.x);
    case kgmetBbHeight :
        return static_cast<uint32>(bbox.tr.y - bbox.bl.y);
    case kgmetAdvWidth :
        return static_cast<uint32>(res.x);
    case kgmetAdvHeight :
        return static_cast<uint32>(res.y);
    default :
        return 0;
    }
}

#define SLOTGETCOLATTR(x) { SlotCollision *c = seg->collisionInfo(this); return c ? int(c-> x) : 0; }

int Slot::getAttr(const Segment *seg, attrCode ind, uint8 subindex) const
{
    if (ind == gr_slatUserDefnV1)
    {
        ind = gr_slatUserDefn;
        subindex = 0;
    }
    else if (ind >= gr_slatJStretch && ind < gr_slatJStretch + 20 && ind != gr_slatJWidth)
    {
        int indx = ind - gr_slatJStretch;
        return getJustify(seg, indx / 5, indx % 5);
    }

    switch (ind)
    {
    case gr_slatAdvX :      return int(m_advance.x);
    case gr_slatAdvY :      return int(m_advance.y);
    case gr_slatAttTo :     return m_parent ? 1 : 0;
    case gr_slatAttX :      return int(m_attach.x);
    case gr_slatAttY :      return int(m_attach.y);
    case gr_slatAttXOff :
    case gr_slatAttYOff :   return 0;
    case gr_slatAttWithX :  return int(m_with.x);
    case gr_slatAttWithY :  return int(m_with.y);
    case gr_slatAttWithXOff:
    case gr_slatAttWithYOff:return 0;
    case gr_slatAttLevel :  return m_attLevel;
    case gr_slatBreak :     return seg->charinfo(m_original)->breakWeight();
    case gr_slatCompRef :   return 0;
    case gr_slatDir :       return seg->dir() & 1;
    case gr_slatInsert :    return isInsertBefore();
    case gr_slatPosX :      return int(m_position.x); // but need to calculate it
    case gr_slatPosY :      return int(m_position.y);
    case gr_slatShiftX :    return int(m_shift.x);
    case gr_slatShiftY :    return int(m_shift.y);
    case gr_slatMeasureSol: return -1; // err what's this?
    case gr_slatMeasureEol: return -1;
    case gr_slatJWidth:     return int(m_just);
    case gr_slatUserDefn :  return m_userAttr[subindex];
    case gr_slatSegSplit :  return seg->charinfo(m_original)->flags() & 3;
    case gr_slatBidiLevel:  return m_bidiLevel;
    case gr_slatColFlags :		{ SlotCollision *c = seg->collisionInfo(this); return c ? c->flags() : 0; }
    case gr_slatColLimitblx :	SLOTGETCOLATTR(limit().bl.x)
    case gr_slatColLimitbly :	SLOTGETCOLATTR(limit().bl.y)
    case gr_slatColLimittrx :	SLOTGETCOLATTR(limit().tr.x)
    case gr_slatColLimittry :	SLOTGETCOLATTR(limit().tr.y)
    case gr_slatColShiftx :		SLOTGETCOLATTR(offset().x)
    case gr_slatColShifty :		SLOTGETCOLATTR(offset().y)
    case gr_slatColMargin :		SLOTGETCOLATTR(margin())
    case gr_slatColMarginWt :	SLOTGETCOLATTR(marginWt())
    case gr_slatColExclGlyph :	SLOTGETCOLATTR(exclGlyph())
    case gr_slatColExclOffx :	SLOTGETCOLATTR(exclOffset().x)
    case gr_slatColExclOffy :	SLOTGETCOLATTR(exclOffset().y)
    case gr_slatSeqClass :		SLOTGETCOLATTR(seqClass())
	case gr_slatSeqProxClass :	SLOTGETCOLATTR(seqProxClass())
    case gr_slatSeqOrder :		SLOTGETCOLATTR(seqOrder())
    case gr_slatSeqAboveXoff :	SLOTGETCOLATTR(seqAboveXoff())
    case gr_slatSeqAboveWt :	SLOTGETCOLATTR(seqAboveWt())
    case gr_slatSeqBelowXlim :	SLOTGETCOLATTR(seqBelowXlim())
    case gr_slatSeqBelowWt :	SLOTGETCOLATTR(seqBelowWt())
    case gr_slatSeqValignHt :	SLOTGETCOLATTR(seqValignHt())
    case gr_slatSeqValignWt :	SLOTGETCOLATTR(seqValignWt())
    default : return 0;
    }
}

#define SLOTCOLSETATTR(x) { \
        SlotCollision *c = seg->collisionInfo(this); \
        if (c) { c-> x ; c->setFlags(c->flags() & ~SlotCollision::COLL_KNOWN); } \
        break; }
#define SLOTCOLSETCOMPLEXATTR(t, y, x) { \
        SlotCollision *c = seg->collisionInfo(this); \
        if (c) { \
        const t &s = c-> y; \
        c-> x ; c->setFlags(c->flags() & ~SlotCollision::COLL_KNOWN); } \
        break; }

void Slot::setAttr(Segment *seg, attrCode ind, uint8 subindex, int16 value, const SlotMap & map)
{
    if (ind == gr_slatUserDefnV1)
    {
        ind = gr_slatUserDefn;
        subindex = 0;
    }
    else if (ind >= gr_slatJStretch && ind < gr_slatJStretch + 20 && ind != gr_slatJWidth)
    {
        int indx = ind - gr_slatJStretch;
        return setJustify(seg, indx / 5, indx % 5, value);
    }

    switch (ind)
    {
    case gr_slatAdvX :  m_advance.x = value; break;
    case gr_slatAdvY :  m_advance.y = value; break;
    case gr_slatAttTo :
    {
        const uint16 idx = uint16(value);
        if (idx < map.size() && map[idx])
        {
            Slot *other = map[idx];
            if (other == this || other == m_parent) break;
            if (m_parent) m_parent->removeChild(this);
            if (!other->isChildOf(this) && other->child(this))
            {
                attachTo(other);
                if ((map.dir() != 0) ^ (idx > subindex))
                    m_with = Position(advance(), 0);
                else        // normal match to previous root
                    m_attach = Position(other->advance(), 0);
            }
        }
        break;
    }
    case gr_slatAttX :          m_attach.x = value; break;
    case gr_slatAttY :          m_attach.y = value; break;
    case gr_slatAttXOff :
    case gr_slatAttYOff :       break;
    case gr_slatAttWithX :      m_with.x = value; break;
    case gr_slatAttWithY :      m_with.y = value; break;
    case gr_slatAttWithXOff :
    case gr_slatAttWithYOff :   break;
    case gr_slatAttLevel :
        m_attLevel = byte(value);
        break;
    case gr_slatBreak :
        seg->charinfo(m_original)->breakWeight(value);
        break;
    case gr_slatCompRef :   break;      // not sure what to do here
    case gr_slatDir : break;
    case gr_slatInsert :
        markInsertBefore(value? true : false);
        break;
    case gr_slatPosX :      break; // can't set these here
    case gr_slatPosY :      break;
    case gr_slatShiftX :    m_shift.x = value; break;
    case gr_slatShiftY :    m_shift.y = value; break;
    case gr_slatMeasureSol :    break;
    case gr_slatMeasureEol :    break;
    case gr_slatJWidth :    just(value); break;
    case gr_slatSegSplit :  seg->charinfo(m_original)->addflags(value & 3); break;
    case gr_slatUserDefn :  m_userAttr[subindex] = value; break;
    case gr_slatColFlags :  {
        SlotCollision *c = seg->collisionInfo(this);
        if (c)
            c->setFlags(value);
        break; }
    case gr_slatColLimitblx :	SLOTCOLSETCOMPLEXATTR(Rect, limit(), setLimit(Rect(Position(value, s.bl.y), s.tr)))
    case gr_slatColLimitbly :	SLOTCOLSETCOMPLEXATTR(Rect, limit(), setLimit(Rect(Position(s.bl.x, value), s.tr)))
    case gr_slatColLimittrx :	SLOTCOLSETCOMPLEXATTR(Rect, limit(), setLimit(Rect(s.bl, Position(value, s.tr.y))))
    case gr_slatColLimittry :	SLOTCOLSETCOMPLEXATTR(Rect, limit(), setLimit(Rect(s.bl, Position(s.tr.x, value))))
    case gr_slatColMargin :		SLOTCOLSETATTR(setMargin(value))
    case gr_slatColMarginWt :	SLOTCOLSETATTR(setMarginWt(value))
    case gr_slatColExclGlyph :	SLOTCOLSETATTR(setExclGlyph(value))
    case gr_slatColExclOffx :	SLOTCOLSETCOMPLEXATTR(Position, exclOffset(), setExclOffset(Position(value, s.y)))
    case gr_slatColExclOffy :	SLOTCOLSETCOMPLEXATTR(Position, exclOffset(), setExclOffset(Position(s.x, value)))
    case gr_slatSeqClass :		SLOTCOLSETATTR(setSeqClass(value))
	case gr_slatSeqProxClass :	SLOTCOLSETATTR(setSeqProxClass(value))
    case gr_slatSeqOrder :		SLOTCOLSETATTR(setSeqOrder(value))
    case gr_slatSeqAboveXoff :	SLOTCOLSETATTR(setSeqAboveXoff(value))
    case gr_slatSeqAboveWt :	SLOTCOLSETATTR(setSeqAboveWt(value))
    case gr_slatSeqBelowXlim :	SLOTCOLSETATTR(setSeqBelowXlim(value))
    case gr_slatSeqBelowWt :	SLOTCOLSETATTR(setSeqBelowWt(value))
    case gr_slatSeqValignHt :	SLOTCOLSETATTR(setSeqValignHt(value))
    case gr_slatSeqValignWt :	SLOTCOLSETATTR(setSeqValignWt(value))
    default :
        break;
    }
}

int Slot::getJustify(const Segment *seg, uint8 level, uint8 subindex) const
{
    if (level && level >= seg->silf()->numJustLevels()) return 0;

    if (m_justs)
        return m_justs->values[level * SlotJustify::NUMJUSTPARAMS + subindex];

    if (level >= seg->silf()->numJustLevels()) return 0;
    Justinfo *jAttrs = seg->silf()->justAttrs() + level;

    switch (subindex) {
        case 0 : return seg->glyphAttr(gid(), jAttrs->attrStretch());
        case 1 : return seg->glyphAttr(gid(), jAttrs->attrShrink());
        case 2 : return seg->glyphAttr(gid(), jAttrs->attrStep());
        case 3 : return seg->glyphAttr(gid(), jAttrs->attrWeight());
        case 4 : return 0;      // not been set yet, so clearly 0
        default: return 0;
    }
}

void Slot::setJustify(Segment *seg, uint8 level, uint8 subindex, int16 value)
{
    if (level && level >= seg->silf()->numJustLevels()) return;
    if (!m_justs)
    {
        SlotJustify *j = seg->newJustify();
        if (!j) return;
        j->LoadSlot(this, seg);
        m_justs = j;
    }
    m_justs->values[level * SlotJustify::NUMJUSTPARAMS + subindex] = value;
}

bool Slot::child(Slot *ap)
{
    if (this == ap) return false;
    else if (ap == m_child) return true;
    else if (!m_child)
        m_child = ap;
    else
        return m_child->sibling(ap);
    return true;
}

bool Slot::sibling(Slot *ap)
{
    if (this == ap) return false;
    else if (ap == m_sibling) return true;
    else if (!m_sibling || !ap)
        m_sibling = ap;
    else
        return m_sibling->sibling(ap);
    return true;
}

bool Slot::removeChild(Slot *ap)
{
    if (this == ap || !m_child) return false;
    else if (ap == m_child)
    {
        Slot *nSibling = m_child->nextSibling();
        m_child->sibling(NULL);
        m_child = nSibling;
        return true;
    }
    else
        return m_child->removeSibling(ap);
    return true;
}

bool Slot::removeSibling(Slot *ap)
{
    if (this == ap || !m_sibling) return false;
    else if (ap == m_sibling)
    {
        m_sibling = m_sibling->nextSibling();
        ap->sibling(NULL);
        return true;
    }
    else
        return m_sibling->removeSibling(ap);
    return true;
}

void Slot::setGlyph(Segment *seg, uint16 glyphid, const GlyphFace * theGlyph)
{
    m_glyphid = glyphid;
    m_bidiCls = -1;
    if (!theGlyph)
    {
        theGlyph = seg->getFace()->glyphs().glyphSafe(glyphid);
        if (!theGlyph)
        {
            m_realglyphid = 0;
            m_advance = Position(0.,0.);
            return;
        }
    }
    m_realglyphid = theGlyph->attrs()[seg->silf()->aPseudo()];
    if (m_realglyphid > seg->getFace()->glyphs().numGlyphs())
        m_realglyphid = 0;
    const GlyphFace *aGlyph = theGlyph;
    if (m_realglyphid)
    {
        aGlyph = seg->getFace()->glyphs().glyphSafe(m_realglyphid);
        if (!aGlyph) aGlyph = theGlyph;
    }
    m_advance = Position(aGlyph->theAdvance().x, 0.);
    if (seg->silf()->aPassBits())
    {
        seg->mergePassBits(theGlyph->attrs()[seg->silf()->aPassBits()]);
        if (seg->silf()->numPasses() > 16)
            seg->mergePassBits(theGlyph->attrs()[seg->silf()->aPassBits()+1] << 16);
    }
}

void Slot::floodShift(Position adj)
{
    m_position += adj;
    if (m_child) m_child->floodShift(adj);
    if (m_sibling) m_sibling->floodShift(adj);
}

void SlotJustify::LoadSlot(const Slot *s, const Segment *seg)
{
    for (int i = seg->silf()->numJustLevels() - 1; i >= 0; --i)
    {
        Justinfo *justs = seg->silf()->justAttrs() + i;
        int16 *v = values + i * NUMJUSTPARAMS;
        v[0] = seg->glyphAttr(s->gid(), justs->attrStretch());
        v[1] = seg->glyphAttr(s->gid(), justs->attrShrink());
        v[2] = seg->glyphAttr(s->gid(), justs->attrStep());
        v[3] = seg->glyphAttr(s->gid(), justs->attrWeight());
    }
}

Slot * Slot::nextInCluster(const Slot *s) const
{
    Slot *base;
    if (s->firstChild())
        return s->firstChild();
    else if (s->nextSibling())
        return s->nextSibling();
    while ((base = s->attachedTo()))
    {
        // if (base->firstChild() == s && base->nextSibling())
        if (base->nextSibling())
            return base->nextSibling();
        s = base;
    }
    return NULL;
}

bool Slot::isChildOf(const Slot *base) const
{
    if (m_parent == base)
        return true;
    else if (!m_parent)
        return false;
    else
        return m_parent->isChildOf(base);
}