lvpagesplitter.cpp 13.8 KB
Newer Older
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
/** \file lvpagesplitter.cpp
    \brief page splitter implementation

    CoolReader Engine

    (c) Vadim Lopatin, 2000-2006
    This source code is distributed under the terms of
    GNU General Public License.

    See LICENSE file for details.
*/

#include "StdAfx.h"
#include "../include/lvpagesplitter.h"
#include "../include/lvtinydom.h"
#include <time.h>


int LVRendPageList::FindNearestPage( int y, int direction )
{
    if (!length())
        return 0;
    for (int i=0; i<length(); i++)
    {
        const LVRendPageInfo * pi = ((*this)[i]);
        if (y<pi->start) {
            if (i==0 || direction>=0)
                return i;
            else
                return i-1;
        } else if (y<pi->start+pi->height) {
            if (i<length()-1 && direction>0)
                return i+1;
            else if (i==0 || direction>=0)
                return i;
            else
                return i-1;
        }
    }
    return length()-1;
}

LVRendPageContext::LVRendPageContext(LVRendPageList * pageList, int pageHeight)
    : callback(NULL), totalFinalBlocks(0)
    , renderedFinalBlocks(0), lastPercent(-1), page_list(pageList), page_h(pageHeight), footNotes(64), curr_note(NULL)
{
    if ( callback ) {
        callback->OnFormatStart();
    }
}

bool LVRendPageContext::updateRenderProgress( int numFinalBlocksRendered )
{
    renderedFinalBlocks += numFinalBlocksRendered;
    int percent = totalFinalBlocks>0 ? renderedFinalBlocks * 100 / totalFinalBlocks : 0;
    if ( percent<0 )
        percent = 0;
    if ( percent>100 )
        percent = 100;
    if ( callback && percent>lastPercent+RENDER_PROGRESS_INTERVAL_PERCENT ) {
        if ( progressTimeout.expired() ) {
            callback->OnFormatProgress(percent);
            progressTimeout.restart(RENDER_PROGRESS_INTERVAL_MILLIS);
            lastPercent = percent;
            return true;
        }
    }
    return false;
}

/// append footnote link to last added line
void LVRendPageContext::addLink( lString16 id )
{
    if ( !page_list )
        return;
    if ( lines.empty() )
        return;
    LVFootNote * note = getOrCreateFootNote( id );
    lines.last()->addLink(note);
}

/// mark start of foot note
void LVRendPageContext::enterFootNote( lString16 id )
{
    if ( !page_list )
        return;
    //CRLog::trace("enterFootNote( %s )", LCSTR(id) );
    if ( curr_note != NULL ) {
        CRLog::error("Nested entering note" );
        return;
    }
    curr_note = getOrCreateFootNote( id );
}

/// mark end of foot note
void LVRendPageContext::leaveFootNote()
{
    if ( !page_list )
        return;
    //CRLog::trace("leaveFootNote()" );
    if ( !curr_note ) {
        CRLog::error("leaveFootNote() w/o current note set");
    }
    curr_note = NULL;
}


void LVRendPageContext::AddLine( int starty, int endy, int flags )
{
    if ( curr_note!=NULL )
        flags |= RN_SPLIT_FOOT_NOTE;
    LVRendLineInfo * line = new LVRendLineInfo(starty, endy, flags);
    lines.add( line );
    if ( curr_note != NULL ) {
        //CRLog::trace("adding line to note (%d)", line->start);
        curr_note->addLine( line );
    }
}

#define FOOTNOTE_MARGIN 12


// helper class
struct PageSplitState {
public:
    int page_h;
    LVRendPageList * page_list;
    const LVRendLineInfo * pagestart;
    const LVRendLineInfo * pageend;
    const LVRendLineInfo * next;
    const LVRendLineInfo * last;
    int   footheight;
    LVFootNote * footnote;
    const LVRendLineInfo * footstart;
    const LVRendLineInfo * footend;
    const LVRendLineInfo * footlast;
    LVArray<LVPageFootNoteInfo> footnotes;
    int lastpageend;

    PageSplitState(LVRendPageList * pl, int pageHeight)
        : page_h(pageHeight)
        , page_list(pl)
        , pagestart(NULL)
        , pageend(NULL)
        , next(NULL)
        , last(NULL)
        , footheight(0)
        , footnote(NULL)
        , footstart(NULL)
        , footend(NULL)
        , footlast(NULL)
        , lastpageend(0)
    {
    }

    unsigned CalcSplitFlag( int flg1, int flg2 )
    {
        if (flg1==RN_SPLIT_AVOID || flg2==RN_SPLIT_AVOID)
            return RN_SPLIT_AVOID;
        if (flg1==RN_SPLIT_ALWAYS || flg2==RN_SPLIT_ALWAYS)
            return RN_SPLIT_ALWAYS;
        return RN_SPLIT_AUTO;
    }

    void StartPage( const LVRendLineInfo * line )
    {
#ifdef DEBUG_FOOTNOTES
        if ( !line ) {
            CRLog::trace("StartPage(NULL)");
        }
        if ( CRLog::isTraceEnabled() )
            CRLog::trace("StartPage(%d)", line ? line->start : -111111111);
#endif
        last = pagestart = line;
        pageend = NULL;
        next = NULL;
    }
    void AddToList()
    {
        bool hasFootnotes = footnotes.length() > 0;
        if ( !pageend )
            pageend = pagestart;
        if ( !pagestart && !hasFootnotes )
            return;
        int start = (pagestart && pageend) ? pagestart->getStart() : lastpageend;
        int h = (pagestart && pageend) ? pageend->getEnd()-pagestart->getStart() : 0;
#ifdef DEBUG_FOOTNOTES
        if ( CRLog::isTraceEnabled() ) {
            if ( pagestart && pageend )
                CRLog::trace("AddToList(%d, %d) footnotes: %d  pageHeight=%d", pagestart->start, pageend->start+pageend->height, footnotes.length(), h);
            else
                CRLog::trace("AddToList(Only footnote: %d) footnotes: %d  pageHeight=%d", lastpageend, footnotes.length(), h);
        }
#endif
        LVRendPageInfo * page = new LVRendPageInfo(start, h, page_list->length());
        lastpageend = start + h;
        if ( footnotes.length()>0 ) {
            page->footnotes.add( footnotes );
            footnotes.clear();
            footheight = 0;
        }
        page_list->add(page);
    }
    int currentFootnoteHeight()
    {
        if ( !footstart )
            return 0;
        int h = 0;
        h = (footlast?footlast:footstart)->getEnd() - footstart->getStart();
        return h;
    }
    int currentHeight( const LVRendLineInfo * line = NULL )
    {
        if ( line == NULL )
            line = last;
        int h = 0;
        if ( line && pagestart )
            h += line->getEnd() - pagestart->getStart();
        int footh = 0 /*currentFootnoteHeight()*/ + footheight;
        if ( footh )
            h += FOOTNOTE_MARGIN + footh;
        return h;
    }
    void AddLine( LVRendLineInfo * line )
    {
        if (pagestart==NULL )
        {
            StartPage( line );
        }
        else 
        {
            if (line->getStart()<last->getEnd())
                return; // for table cells
            unsigned flgSplit = CalcSplitFlag( last->getSplitAfter(), line->getSplitBefore() );
            //bool flgFit = currentHeight( next ? next : line ) <= page_h;
            bool flgFit = currentHeight( line ) <= page_h;
            if (!flgFit)
            {
            // doesn't fit
            // split
//                if ( !next || !pageend) {
                    next = line;
                    pageend = last;
//                }
                AddToList();
                StartPage(next);
            }
            else if (flgSplit==RN_SPLIT_ALWAYS)
            {
            //fits, but split is mandatory
                if (next==NULL)
                {
                    next = line;
                }
                pageend = last;
                AddToList();
                StartPage(line);
            }
            else if (flgSplit==RN_SPLIT_AUTO)
            {
            //fits, split is allowed
            //update split candidate
                pageend = last;
                next = line;
            }
        }
        last = line;
    }
    void Finalize()
    {
        if (last==NULL)
            return;
        pageend = last;
        AddToList();
    }
    void StartFootNote( LVFootNote * note )
    {
#ifdef DEBUG_FOOTNOTES
        CRLog::trace( "StartFootNote(%d)", note->getLines().length() );
#endif
        if ( !note || note->getLines().length()==0 )
            return;
        footnote = note;
        //footstart = footnote->getLines()[0];
        //footlast = footnote->getLines()[0];
        footend = NULL;
    }
    void AddFootnoteFragmentToList()
    {
        if ( footstart==NULL )
            return; // no data
        if ( footend==NULL )
            footend = footstart;
        //CRLog::trace("AddFootnoteFragmentToList(%d, %d)", footstart->start, footend->end );
        int h = footend->getEnd() - footstart->getStart(); // currentFootnoteHeight();
        if ( h>0 && h<page_h ) {
            footheight += h;
#ifdef DEBUG_FOOTNOTES
            CRLog::trace("AddFootnoteFragmentToList(%d, %d)", footstart->getStart(), h);
#endif
            footnotes.add( LVPageFootNoteInfo( footstart->getStart(), h ) );
        }
        footstart = footend = NULL;
    }
    /// footnote is finished
    void EndFootNote()
    {
#ifdef DEBUG_FOOTNOTES
        CRLog::trace("EndFootNote()");
#endif
        footend = footlast;
        AddFootnoteFragmentToList();
        footnote = NULL;
        footstart = footend = footlast = NULL;
    }
    void AddFootnoteLine( LVRendLineInfo * line )
    {
        int dh = line->getEnd()
            - (footstart ? footstart->getStart() : line->getStart())
            + (footheight==0?FOOTNOTE_MARGIN:0);
        int h = currentHeight(NULL); //next
#ifdef DEBUG_FOOTNOTES
        CRLog::trace("Add footnote line %d  footheight=%d  h=%d  dh=%d  page_h=%d", line->start, footheight, h, dh, page_h);
#endif
        if ( h + dh > page_h ) {
#ifdef DEBUG_FOOTNOTES
            CRLog::trace("No current page space for this line, %s", (footstart?"footstart is not null":"footstart is null"));
#endif
            if ( footstart==NULL ) {
                //CRLog::trace("Starting new footnote fragment");
                // no footnote lines fit
                //pageend = last;
                AddToList();
                //StartPage( last );
                StartPage( last );
            } else {
                AddFootnoteFragmentToList();
                //const LVRendLineInfo * save = ?:last;
                // = NULL;
                // LVE-TODO-TEST
                //if ( next != NULL ) {
                    pageend = last;
                    AddToList();
                    StartPage( NULL );
                    //StartPage( next );
                //}
            }
            footstart = footlast = line;
            footend = NULL;
            return;
        }
        if ( footstart==NULL ) {
            footstart = footlast = line;
            footend = line;
        } else {
            footend = line;
            footlast = line;
        }
    }
};

void LVRendPageContext::split()
{
    if ( !page_list )
        return;
    PageSplitState s(page_list, page_h);

    int lineCount = lines.length();


    LVRendLineInfo * line = NULL;
    for ( int lindex=0; lindex<lineCount; lindex++ ) {
        line = lines[lindex];
        s.AddLine( line );
        // add footnotes for line, if any...
        if ( line->getLinks() ) {
            s.last = line;
            s.next = lindex<lineCount-1?lines[lindex+1]:line;
            bool foundFootNote = false;
            //if ( CRLog::isTraceEnabled() && line->getLinks()->length()>0 ) {
            //    CRLog::trace("LVRendPageContext::split() line %d: found %d links", lindex, line->getLinks()->length() );
           // }
            for ( int j=0; j<line->getLinks()->length(); j++ ) {
                LVFootNote* note = line->getLinks()->get(j);
                if ( note->getLines().length() ) {
                    foundFootNote = true;
                    s.StartFootNote( note );
                    for ( int k=0; k<note->getLines().length(); k++ ) {
                        s.AddFootnoteLine( note->getLines()[k] );
                    }
                    s.EndFootNote();
                }
            }
            if ( !foundFootNote )
                line->flags = line->flags & ~RN_SPLIT_FOOT_LINK;
        }
    }
    s.Finalize();
}

void LVRendPageContext::Finalize()
{
    split();
    lines.clear();
    footNotes.clear();
}

static const char * pagelist_magic = "PageList";

bool LVRendPageList::serialize( SerialBuf & buf )
{
    if ( buf.error() )
        return false;
    buf.putMagic( pagelist_magic );
    int pos = buf.pos();
    buf << (lUInt32)length();
    for ( int i=0; i<length(); i++ ) {
        get(i)->serialize( buf );
    }
    buf.putMagic( pagelist_magic );
    buf.putCRC( buf.pos() - pos );
    return !buf.error();
}

bool LVRendPageList::deserialize( SerialBuf & buf )
{
    if ( buf.error() )
        return false;
    if ( !buf.checkMagic( pagelist_magic ) )
        return false;
    clear();
    int pos = buf.pos();
    lUInt32 len;
    buf >> len;
    clear();
    reserve(len);
    for (lUInt32 i = 0; i < len; i++) {
        LVRendPageInfo * item = new LVRendPageInfo();
        item->deserialize( buf );
        item->index = i;
        add( item );
    }
    if ( !buf.checkMagic( pagelist_magic ) )
        return false;
    buf.checkCRC( buf.pos() - pos );
    return !buf.error();
}

bool LVRendPageInfo::serialize( SerialBuf & buf )
{
    if ( buf.error() )
        return false;
    buf << (lUInt32)start; /// start of page
    buf << (lUInt16)height; /// height of page, does not include footnotes
    buf << (lUInt8) type;   /// type: PAGE_TYPE_NORMAL, PAGE_TYPE_COVER
    lUInt16 len = footnotes.length();
    buf << len;
    for ( int i=0; i<len; i++ ) {
        buf << (lUInt32)footnotes[i].start;
        buf << (lUInt32)footnotes[i].height;
    }
    return !buf.error();
}

bool LVRendPageInfo::deserialize( SerialBuf & buf )
{
    if ( buf.error() )
        return false;
    lUInt32 n1;
	lUInt16 n2;
    lUInt8 n3;

    buf >> n1 >> n2 >> n3; /// start of page

    start = n1;
    height = n2;
    type = n3;

    lUInt16 len;
    buf >> len;
    footnotes.clear();
    if ( len ) {
        footnotes.reserve(len);
        for ( int i=0; i<len; i++ ) {
            lUInt32 n1;
            lUInt32 n2;
            buf >> n1;
            buf >> n2;
            footnotes.add( LVPageFootNoteInfo( n1, n2 ) );
        }
    }
    return !buf.error();
}