source/libs/poppler/poppler-src/poppler/Page.cc

   1 //========================================================================
   2 //
   3 // Page.cc
   4 //
   5 // Copyright 1996-2007 Glyph & Cog, LLC
   6 //
   7 //========================================================================
   8
   9 //========================================================================
  10 //
  11 // Modified under the Poppler project - http://poppler.freedesktop.org
  12 //
  13 // All changes made under the Poppler project to this file are licensed
  14 // under GPL version 2 or later
  15 //
  16 // Copyright (C) 2005 Kristian Høgsberg <krh@redhat.com>
  17 // Copyright (C) 2005 Jeff Muizelaar <jeff@infidigm.net>
  18 // Copyright (C) 2005-2013 Albert Astals Cid <aacid@kde.org>
  19 // Copyright (C) 2006-2008 Pino Toscano <pino@kde.org>
  20 // Copyright (C) 2006 Nickolay V. Shmyrev <nshmyrev@yandex.ru>
  21 // Copyright (C) 2006 Scott Turner <scotty1024@mac.com>
  22 // Copyright (C) 2006-2011, 2015 Carlos Garcia Campos <carlosgc@gnome.org>
  23 // Copyright (C) 2007 Julien Rebetez <julienr@svn.gnome.org>
  24 // Copyright (C) 2008 Iñigo Martínez <inigomartinez@gmail.com>
  25 // Copyright (C) 2008 Brad Hards <bradh@kde.org>
  26 // Copyright (C) 2008 Ilya Gorenbein <igorenbein@finjan.com>
  27 // Copyright (C) 2012, 2013 Fabio D'Urso <fabiodurso@hotmail.it>
  28 // Copyright (C) 2013, 2014 Thomas Freitag <Thomas.Freitag@alfa.de>
  29 // Copyright (C) 2013 Jason Crain <jason@aquaticape.us>
  30 // Copyright (C) 2013 Adrian Johnson <ajohnson@redneon.com>
  31 // Copyright (C) 2015 Philipp Reinkemeier <philipp.reinkemeier@offis.de>
  32 //
  33 // To see a description of the changes please see the Changelog file that
  34 // came with your tarball or type make ChangeLog if you are building from git
  35 //
  36 //========================================================================
  37
  38 #include <config.h>
  39
  40 #ifdef USE_GCC_PRAGMAS
  41 #pragma implementation
  42 #endif
  43
  44 #include <stddef.h>
  45 #include <limits.h>
  46 #include "GlobalParams.h"
  47 #include "Object.h"
  48 #include "Array.h"
  49 #include "Dict.h"
  50 #include "PDFDoc.h"
  51 #include "XRef.h"
  52 #include "Link.h"
  53 #include "OutputDev.h"
  54 #include "Gfx.h"
  55 #include "GfxState.h"
  56 #include "Annot.h"
  57 #include "TextOutputDev.h"
  58 #include "Form.h"
  59 #include "Error.h"
  60 #include "Page.h"
  61 #include "Catalog.h"
  62 #include "Form.h"
  63
  64 #if MULTITHREADED
  65 #  define pageLocker()   MutexLocker locker(&mutex)
  66 #else
  67 #  define pageLocker()
  68 #endif
  69 //------------------------------------------------------------------------
  70 // PDFRectangle
  71 //------------------------------------------------------------------------
  72
  73 void PDFRectangle::clipTo(PDFRectangle *rect) {
  74   if (x1 < rect->x1) {
  75     x1 = rect->x1;
  76   } else if (x1 > rect->x2) {
  77     x1 = rect->x2;
  78   }
  79   if (x2 < rect->x1) {
  80     x2 = rect->x1;
  81   } else if (x2 > rect->x2) {
  82     x2 = rect->x2;
  83   }
  84   if (y1 < rect->y1) {
  85     y1 = rect->y1;
  86   } else if (y1 > rect->y2) {
  87     y1 = rect->y2;
  88   }
  89   if (y2 < rect->y1) {
  90     y2 = rect->y1;
  91   } else if (y2 > rect->y2) {
  92     y2 = rect->y2;
  93   }
  94 }
  95
  96 //------------------------------------------------------------------------
  97 // PageAttrs
  98 //------------------------------------------------------------------------
  99
 100 PageAttrs::PageAttrs(PageAttrs *attrs, Dict *dict) {
 101   Object obj1;
 102   PDFRectangle mBox;
 103   const GBool isPage = dict->is("Page");
 104
 105   // get old/default values
 106   if (attrs) {
 107     mediaBox = attrs->mediaBox;
 108     cropBox = attrs->cropBox;
 109     haveCropBox = attrs->haveCropBox;
 110     rotate = attrs->rotate;
 111     attrs->resources.copy(&resources);
 112   } else {
 113     // set default MediaBox to 8.5" x 11" -- this shouldn't be necessary
 114     // but some (non-compliant) PDF files don't specify a MediaBox
 115     mediaBox.x1 = 0;
 116     mediaBox.y1 = 0;
 117     mediaBox.x2 = 612;
 118     mediaBox.y2 = 792;
 119     cropBox.x1 = cropBox.y1 = cropBox.x2 = cropBox.y2 = 0;
 120     haveCropBox = gFalse;
 121     rotate = 0;
 122     resources.initNull();
 123   }
 124
 125   // media box
 126   if (readBox(dict, "MediaBox", &mBox)) {
 127     mediaBox = mBox;
 128   }
 129
 130   // crop box
 131   if (readBox(dict, "CropBox", &cropBox)) {
 132     haveCropBox = gTrue;
 133   }
 134   if (!haveCropBox) {
 135     cropBox = mediaBox;
 136   }
 137
 138   if (isPage) {
 139     // cropBox can not be bigger than mediaBox
 140     if (cropBox.x2 - cropBox.x1 > mediaBox.x2 - mediaBox.x1)
 141     {
 142       cropBox.x1 = mediaBox.x1;
 143       cropBox.x2 = mediaBox.x2;
 144     }
 145     if (cropBox.y2 - cropBox.y1 > mediaBox.y2 - mediaBox.y1)
 146     {
 147       cropBox.y1 = mediaBox.y1;
 148       cropBox.y2 = mediaBox.y2;
 149     }
 150   }
 151
 152   // other boxes
 153   bleedBox = cropBox;
 154   readBox(dict, "BleedBox", &bleedBox);
 155   trimBox = cropBox;
 156   readBox(dict, "TrimBox", &trimBox);
 157   artBox = cropBox;
 158   readBox(dict, "ArtBox", &artBox);
 159
 160   // rotate
 161   dict->lookup("Rotate", &obj1);
 162   if (obj1.isInt()) {
 163     rotate = obj1.getInt();
 164   }
 165   obj1.free();
 166   while (rotate < 0) {
 167     rotate += 360;
 168   }
 169   while (rotate >= 360) {
 170     rotate -= 360;
 171   }
 172
 173   // misc attributes
 174   dict->lookup("LastModified", &lastModified);
 175   dict->lookup("BoxColorInfo", &boxColorInfo);
 176   dict->lookup("Group", &group);
 177   dict->lookup("Metadata", &metadata);
 178   dict->lookup("PieceInfo", &pieceInfo);
 179   dict->lookup("SeparationInfo", &separationInfo);
 180
 181   // resource dictionary
 182   dict->lookup("Resources", &obj1);
 183   if (obj1.isDict()) {
 184     resources.free();
 185     obj1.copy(&resources);
 186   }
 187   obj1.free();
 188 }
 189
 190 PageAttrs::~PageAttrs() {
 191   lastModified.free();
 192   boxColorInfo.free();
 193   group.free();
 194   metadata.free();
 195   pieceInfo.free();
 196   separationInfo.free();
 197   resources.free();
 198 }
 199
 200 void PageAttrs::clipBoxes() {
 201   cropBox.clipTo(&mediaBox);
 202   bleedBox.clipTo(&mediaBox);
 203   trimBox.clipTo(&mediaBox);
 204   artBox.clipTo(&mediaBox);
 205 }
 206
 207 GBool PageAttrs::readBox(Dict *dict, const char *key, PDFRectangle *box) {
 208   PDFRectangle tmp;
 209   double t;
 210   Object obj1, obj2;
 211   GBool ok;
 212
 213   dict->lookup(key, &obj1);
 214   if (obj1.isArray() && obj1.arrayGetLength() == 4) {
 215     ok = gTrue;
 216     obj1.arrayGet(0, &obj2);
 217     if (obj2.isNum()) {
 218       tmp.x1 = obj2.getNum();
 219     } else {
 220       ok = gFalse;
 221     }
 222     obj2.free();
 223     obj1.arrayGet(1, &obj2);
 224     if (obj2.isNum()) {
 225       tmp.y1 = obj2.getNum();
 226     } else {
 227       ok = gFalse;
 228     }
 229     obj2.free();
 230     obj1.arrayGet(2, &obj2);
 231     if (obj2.isNum()) {
 232       tmp.x2 = obj2.getNum();
 233     } else {
 234       ok = gFalse;
 235     }
 236     obj2.free();
 237     obj1.arrayGet(3, &obj2);
 238     if (obj2.isNum()) {
 239       tmp.y2 = obj2.getNum();
 240     } else {
 241       ok = gFalse;
 242     }
 243     obj2.free();
 244     if (tmp.x1 == 0 && tmp.x2 == 0 && tmp.y1 == 0 && tmp.y2 == 0)
 245       ok = gFalse;
 246     if (ok) {
 247       if (tmp.x1 > tmp.x2) {
 248         t = tmp.x1; tmp.x1 = tmp.x2; tmp.x2 = t;
 249       }
 250       if (tmp.y1 > tmp.y2) {
 251         t = tmp.y1; tmp.y1 = tmp.y2; tmp.y2 = t;
 252       }
 253       *box = tmp;
 254     }
 255   } else {
 256     ok = gFalse;
 257   }
 258   obj1.free();
 259   return ok;
 260 }
 261
 262 //------------------------------------------------------------------------
 263 // Page
 264 //------------------------------------------------------------------------
 265
 266 Page::Page(PDFDoc *docA, int numA, Dict *pageDict, Ref pageRefA, PageAttrs *attrsA, Form *form) {
 267   Object tmp;
 268
 269 #if MULTITHREADED
 270   gInitMutex(&mutex);
 271 #endif
 272   ok = gTrue;
 273   doc = docA;
 274   xref = doc->getXRef();
 275   num = numA;
 276   duration = -1;
 277   annots = NULL;
 278
 279   pageObj.initDict(pageDict);
 280   pageRef = pageRefA;
 281
 282   // get attributes
 283   attrs = attrsA;
 284   attrs->clipBoxes();
 285
 286   // transtion
 287   pageDict->lookupNF("Trans", &trans);
 288   if (!(trans.isRef() || trans.isDict() || trans.isNull())) {
 289     error(errSyntaxError, -1, "Page transition object (page {0:d}) is wrong type ({1:s})",
 290           num, trans.getTypeName());
 291     trans.free();
 292   }
 293
 294   // duration
 295   pageDict->lookupNF("Dur", &tmp);
 296   if (!(tmp.isNum() || tmp.isNull())) {
 297     error(errSyntaxError, -1, "Page duration object (page {0:d}) is wrong type ({1:s})",
 298           num, tmp.getTypeName());
 299   } else if (tmp.isNum()) {
 300     duration = tmp.getNum();
 301   }
 302   tmp.free();
 303
 304   // annotations
 305   pageDict->lookupNF("Annots", &annotsObj);
 306   if (!(annotsObj.isRef() || annotsObj.isArray() || annotsObj.isNull())) {
 307     error(errSyntaxError, -1, "Page annotations object (page {0:d}) is wrong type ({1:s})",
 308           num, annotsObj.getTypeName());
 309     annotsObj.free();
 310     goto err2;
 311   }
 312
 313   // contents
 314   pageDict->lookupNF("Contents", &contents);
 315   if (!(contents.isRef() || contents.isArray() ||
 316         contents.isNull())) {
 317     error(errSyntaxError, -1, "Page contents object (page {0:d}) is wrong type ({1:s})",
 318           num, contents.getTypeName());
 319     contents.free();
 320     goto err1;
 321   }
 322
 323   // thumb
 324   pageDict->lookupNF("Thumb", &thumb);
 325   if (!(thumb.isStream() || thumb.isNull() || thumb.isRef())) {
 326       error(errSyntaxError, -1, "Page thumb object (page {0:d}) is wrong type ({1:s})",
 327             num, thumb.getTypeName());
 328       thumb.initNull();
 329   }
 330
 331   // actions
 332   pageDict->lookupNF("AA", &actions);
 333   if (!(actions.isDict() || actions.isNull())) {
 334       error(errSyntaxError, -1, "Page additional action object (page {0:d}) is wrong type ({1:s})",
 335             num, actions.getTypeName());
 336       actions.initNull();
 337   }
 338
 339   return;
 340
 341   trans.initNull();
 342  err2:
 343   annotsObj.initNull();
 344  err1:
 345   contents.initNull();
 346   ok = gFalse;
 347 }
 348
 349 Page::~Page() {
 350   delete attrs;
 351   delete annots;
 352   pageObj.free();
 353   annotsObj.free();
 354   contents.free();
 355   trans.free();
 356   thumb.free();
 357   actions.free();
 358 #if MULTITHREADED
 359   gDestroyMutex(&mutex);
 360 #endif
 361 }
 362
 363 Dict *Page::getResourceDict() {
 364   return attrs->getResourceDict();
 365 }
 366
 367 Dict *Page::getResourceDictCopy(XRef *xrefA) {
 368   pageLocker();
 369   Dict *dict = attrs->getResourceDict();
 370   return dict ? dict->copy(xrefA) : NULL;
 371 }
 372
 373 void Page::replaceXRef(XRef *xrefA) {
 374   Object obj1;
 375   Dict *pageDict = pageObj.getDict()->copy(xrefA);
 376   xref = xrefA;
 377   trans.free();
 378   pageDict->lookupNF("Trans", &trans);
 379   annotsObj.free();
 380   pageDict->lookupNF("Annots", &annotsObj);
 381   contents.free();
 382   pageDict->lookupNF("Contents", &contents);
 383   if (contents.isArray()) {
 384     contents.free();
 385     pageDict->lookupNF("Contents", &obj1)->getArray()->copy(xrefA, &contents);
 386     obj1.free();
 387   }
 388   thumb.free();
 389   pageDict->lookupNF("Thumb", &thumb);
 390   actions.free();
 391   pageDict->lookupNF("AA", &actions);
 392   pageDict->lookup("Resources", &obj1);
 393   if (obj1.isDict()) {
 394     attrs->replaceResource(obj1);
 395   }
 396   obj1.free();
 397   delete pageDict;
 398 }
 399
 400 Annots *Page::getAnnots(XRef *xrefA) {
 401   if (!annots) {
 402     Object obj;
 403     annots = new Annots(doc, num, getAnnots(&obj, (xrefA == NULL) ? xref : xrefA));
 404     obj.free();
 405   }
 406
 407   return annots;
 408 }
 409
 410 void Page::addAnnot(Annot *annot) {
 411   Object obj1;
 412   Object tmp;
 413   Ref annotRef = annot->getRef ();
 414
 415   // Make sure we have annots before adding the new one
 416   // even if it's an empty list so that we can safely
 417   // call annots->appendAnnot(annot)
 418   pageLocker();
 419   getAnnots();
 420
 421   if (annotsObj.isNull()) {
 422     Ref annotsRef;
 423     // page doesn't have annots array,
 424     // we have to create it
 425
 426     obj1.initArray(xref);
 427     obj1.arrayAdd(tmp.initRef (annotRef.num, annotRef.gen));
 428     tmp.free();
 429
 430     annotsRef = xref->addIndirectObject (&obj1);
 431     annotsObj.initRef(annotsRef.num, annotsRef.gen);
 432     pageObj.dictSet ("Annots", &annotsObj);
 433     xref->setModifiedObject (&pageObj, pageRef);
 434   } else {
 435     getAnnots(&obj1);
 436     if (obj1.isArray()) {
 437       obj1.arrayAdd (tmp.initRef (annotRef.num, annotRef.gen));
 438       if (annotsObj.isRef())
 439         xref->setModifiedObject (&obj1, annotsObj.getRef());
 440       else
 441         xref->setModifiedObject (&pageObj, pageRef);
 442     }
 443     obj1.free();
 444   }
 445
 446   // Popup annots are already handled by markup annots,
 447   // so add to the list only Popup annots without a
 448   // markup annotation associated.
 449   if (annot->getType() != Annot::typePopup ||
 450       static_cast<AnnotPopup*>(annot)->getParentNF()->isNull()) {
 451     annots->appendAnnot(annot);
 452   }
 453   annot->setPage(num, gTrue);
 454
 455   AnnotMarkup *annotMarkup = dynamic_cast<AnnotMarkup*>(annot);
 456   if (annotMarkup) {
 457     AnnotPopup *annotPopup = annotMarkup->getPopup();
 458     if (annotPopup)
 459       addAnnot(annotPopup);
 460   }
 461 }
 462
 463 void Page::removeAnnot(Annot *annot) {
 464   Ref annotRef = annot->getRef();
 465   Object annArray;
 466
 467   pageLocker();
 468   getAnnots(&annArray);
 469   if (annArray.isArray()) {
 470     int idx = -1;
 471     // Get annotation position
 472     for (int i = 0; idx == -1 && i < annArray.arrayGetLength(); ++i) {
 473       Object tmp;
 474       if (annArray.arrayGetNF(i, &tmp)->isRef()) {
 475         Ref currAnnot = tmp.getRef();
 476         if (currAnnot.num == annotRef.num && currAnnot.gen == annotRef.gen) {
 477           idx = i;
 478         }
 479       }
 480       tmp.free();
 481     }
 482
 483     if (idx == -1) {
 484       error(errInternal, -1, "Annotation doesn't belong to this page");
 485       annArray.free();
 486       return;
 487     }
 488     annots->removeAnnot(annot); // Gracefully fails on popup windows
 489     annArray.arrayRemove(idx);
 490     xref->removeIndirectObject(annotRef);
 491
 492     if (annotsObj.isRef()) {
 493       xref->setModifiedObject (&annArray, annotsObj.getRef());
 494     } else {
 495       xref->setModifiedObject (&pageObj, pageRef);
 496     }
 497   }
 498   annArray.free();
 499   annot->removeReferencedObjects(); // Note: Might recurse in removeAnnot again
 500   annot->setPage(0, gFalse);
 501 }
 502
 503 Links *Page::getLinks() {
 504   return new Links(getAnnots());
 505 }
 506
 507 FormPageWidgets *Page::getFormWidgets() {
 508   return new FormPageWidgets(getAnnots(), num, doc->getCatalog()->getForm());
 509 }
 510
 511 void Page::display(OutputDev *out, double hDPI, double vDPI,
 512                    int rotate, GBool useMediaBox, GBool crop,
 513                    GBool printing,
 514                    GBool (*abortCheckCbk)(void *data),
 515                    void *abortCheckCbkData,
 516                    GBool (*annotDisplayDecideCbk)(Annot *annot, void *user_data),
 517                    void *annotDisplayDecideCbkData,
 518                    GBool copyXRef) {
 519   displaySlice(out, hDPI, vDPI, rotate, useMediaBox, crop, -1, -1, -1, -1, printing,
 520                abortCheckCbk, abortCheckCbkData,
 521                annotDisplayDecideCbk, annotDisplayDecideCbkData, copyXRef);
 522 }
 523
 524 Gfx *Page::createGfx(OutputDev *out, double hDPI, double vDPI,
 525                      int rotate, GBool useMediaBox, GBool crop,
 526                      int sliceX, int sliceY, int sliceW, int sliceH,
 527                      GBool printing,
 528                      GBool (*abortCheckCbk)(void *data),
 529                      void *abortCheckCbkData, XRef *xrefA) {
 530   PDFRectangle *mediaBox, *cropBox;
 531   PDFRectangle box;
 532   Gfx *gfx;
 533
 534   rotate += getRotate();
 535   if (rotate >= 360) {
 536     rotate -= 360;
 537   } else if (rotate < 0) {
 538     rotate += 360;
 539   }
 540
 541   makeBox(hDPI, vDPI, rotate, useMediaBox, out->upsideDown(),
 542           sliceX, sliceY, sliceW, sliceH, &box, &crop);
 543   cropBox = getCropBox();
 544   mediaBox = getMediaBox();
 545
 546   if (globalParams->getPrintCommands()) {
 547     printf("***** MediaBox = ll:%g,%g ur:%g,%g\n",
 548             mediaBox->x1, mediaBox->y1, mediaBox->x2, mediaBox->y2);
 549       printf("***** CropBox = ll:%g,%g ur:%g,%g\n",
 550              cropBox->x1, cropBox->y1, cropBox->x2, cropBox->y2);
 551     printf("***** Rotate = %d\n", attrs->getRotate());
 552   }
 553
 554   if (!crop) {
 555     crop = (box == *cropBox) && out->needClipToCropBox();
 556   }
 557   gfx = new Gfx(doc, out, num, attrs->getResourceDict(),
 558                 hDPI, vDPI, &box, crop ? cropBox : (PDFRectangle *)NULL,
 559                 rotate, abortCheckCbk, abortCheckCbkData, xrefA);
 560
 561   return gfx;
 562 }
 563
 564 void Page::displaySlice(OutputDev *out, double hDPI, double vDPI,
 565                         int rotate, GBool useMediaBox, GBool crop,
 566                         int sliceX, int sliceY, int sliceW, int sliceH,
 567                         GBool printing,
 568                         GBool (*abortCheckCbk)(void *data),
 569                         void *abortCheckCbkData,
 570                         GBool (*annotDisplayDecideCbk)(Annot *annot, void *user_data),
 571                         void *annotDisplayDecideCbkData,
 572                         GBool copyXRef) {
 573   Gfx *gfx;
 574   Object obj;
 575   Annots *annotList;
 576   int i;
 577
 578   if (!out->checkPageSlice(this, hDPI, vDPI, rotate, useMediaBox, crop,
 579                            sliceX, sliceY, sliceW, sliceH,
 580                            printing,
 581                            abortCheckCbk, abortCheckCbkData,
 582                            annotDisplayDecideCbk, annotDisplayDecideCbkData)) {
 583     return;
 584   }
 585   pageLocker();
 586   XRef *localXRef = (copyXRef) ? xref->copy() : xref;
 587   if (copyXRef) {
 588     replaceXRef(localXRef);
 589   }
 590
 591   gfx = createGfx(out, hDPI, vDPI, rotate, useMediaBox, crop,
 592                   sliceX, sliceY, sliceW, sliceH,
 593                   printing,
 594                   abortCheckCbk, abortCheckCbkData, localXRef);
 595
 596   contents.fetch(localXRef, &obj);
 597   if (!obj.isNull()) {
 598     gfx->saveState();
 599     gfx->display(&obj);
 600     gfx->restoreState();
 601   } else {
 602     // empty pages need to call dump to do any setup required by the
 603     // OutputDev
 604     out->dump();
 605   }
 606   obj.free();
 607
 608   // draw annotations
 609   annotList = getAnnots();
 610
 611   if (annotList->getNumAnnots() > 0) {
 612     if (globalParams->getPrintCommands()) {
 613       printf("***** Annotations\n");
 614     }
 615     for (i = 0; i < annotList->getNumAnnots(); ++i) {
 616         Annot *annot = annotList->getAnnot(i);
 617         if ((annotDisplayDecideCbk &&
 618              (*annotDisplayDecideCbk)(annot, annotDisplayDecideCbkData)) ||
 619             !annotDisplayDecideCbk) {
 620              annotList->getAnnot(i)->draw(gfx, printing);
 621         }
 622     }
 623     out->dump();
 624   }
 625
 626   delete gfx;
 627   if (copyXRef) {
 628     replaceXRef(doc->getXRef());
 629     delete localXRef;
 630   }
 631 }
 632
 633 void Page::display(Gfx *gfx) {
 634   Object obj;
 635
 636   contents.fetch(xref, &obj);
 637   if (!obj.isNull()) {
 638     gfx->saveState();
 639     gfx->display(&obj);
 640     gfx->restoreState();
 641   }
 642   obj.free();
 643 }
 644
 645 GBool Page::loadThumb(unsigned char **data_out,
 646                       int *width_out, int *height_out,
 647                       int *rowstride_out)
 648 {
 649   unsigned int pixbufdatasize;
 650   int width, height, bits;
 651   Object obj1, fetched_thumb;
 652   Dict *dict;
 653   GfxColorSpace *colorSpace;
 654   GBool success = gFalse;
 655   Stream *str;
 656   GfxImageColorMap *colorMap;
 657
 658   /* Get stream dict */
 659   pageLocker();
 660   thumb.fetch(xref, &fetched_thumb);
 661   if (!fetched_thumb.isStream()) {
 662     fetched_thumb.free();
 663     return gFalse;
 664   }
 665
 666   dict = fetched_thumb.streamGetDict();
 667   str = fetched_thumb.getStream();
 668
 669   if (!dict->lookupInt("Width", "W", &width))
 670     goto fail1;
 671   if (!dict->lookupInt("Height", "H", &height))
 672     goto fail1;
 673   if (!dict->lookupInt("BitsPerComponent", "BPC", &bits))
 674     goto fail1;
 675
 676   /* Check for invalid dimensions and integer overflow. */
 677   if (width <= 0 || height <= 0)
 678     goto fail1;
 679   if (width > INT_MAX / 3 / height)
 680     goto fail1;
 681   pixbufdatasize = width * height * 3;
 682
 683   /* Get color space */
 684   dict->lookup ("ColorSpace", &obj1);
 685   if (obj1.isNull ()) {
 686     obj1.free ();
 687     dict->lookup ("CS", &obj1);
 688   }
 689   colorSpace = GfxColorSpace::parse(NULL, &obj1, NULL, NULL);
 690   obj1.free();
 691   if (!colorSpace) {
 692     fprintf (stderr, "Error: Cannot parse color space\n");
 693     goto fail1;
 694   }
 695
 696   dict->lookup("Decode", &obj1);
 697   if (obj1.isNull()) {
 698     obj1.free();
 699     dict->lookup("D", &obj1);
 700   }
 701   colorMap = new GfxImageColorMap(bits, &obj1, colorSpace);
 702   obj1.free();
 703   if (!colorMap->isOk()) {
 704     fprintf (stderr, "Error: invalid colormap\n");
 705     delete colorMap;
 706     goto fail1;
 707   }
 708
 709   if (data_out) {
 710     unsigned char *pixbufdata = (unsigned char *) gmalloc(pixbufdatasize);
 711     unsigned char *p = pixbufdata;
 712     ImageStream *imgstr = new ImageStream(str, width,
 713                            colorMap->getNumPixelComps(),
 714                            colorMap->getBits());
 715     imgstr->reset();
 716     for (int row = 0; row < height; ++row) {
 717       for (int col = 0; col < width; ++col) {
 718         Guchar pix[gfxColorMaxComps];
 719         GfxRGB rgb;
 720
 721         imgstr->getPixel(pix);
 722         colorMap->getRGB(pix, &rgb);
 723
 724         *p++ = colToByte(rgb.r);
 725         *p++ = colToByte(rgb.g);
 726         *p++ = colToByte(rgb.b);
 727       }
 728     }
 729     *data_out = pixbufdata;
 730     imgstr->close();
 731     delete imgstr;
 732   }
 733
 734   success = gTrue;
 735
 736   if (width_out)
 737     *width_out = width;
 738   if (height_out)
 739     *height_out = height;
 740   if (rowstride_out)
 741     *rowstride_out = width * 3;
 742
 743   delete colorMap;
 744  fail1:
 745   fetched_thumb.free();
 746
 747   return success;
 748 }
 749
 750 void Page::makeBox(double hDPI, double vDPI, int rotate,
 751                    GBool useMediaBox, GBool upsideDown,
 752                    double sliceX, double sliceY, double sliceW, double sliceH,
 753                    PDFRectangle *box, GBool *crop) {
 754   PDFRectangle *mediaBox, *cropBox, *baseBox;
 755   double kx, ky;
 756
 757   mediaBox = getMediaBox();
 758   cropBox = getCropBox();
 759   if (sliceW >= 0 && sliceH >= 0) {
 760     baseBox = useMediaBox ? mediaBox : cropBox;
 761     kx = 72.0 / hDPI;
 762     ky = 72.0 / vDPI;
 763     if (rotate == 90) {
 764       if (upsideDown) {
 765         box->x1 = baseBox->x1 + ky * sliceY;
 766         box->x2 = baseBox->x1 + ky * (sliceY + sliceH);
 767       } else {
 768         box->x1 = baseBox->x2 - ky * (sliceY + sliceH);
 769         box->x2 = baseBox->x2 - ky * sliceY;
 770       }
 771       box->y1 = baseBox->y1 + kx * sliceX;
 772       box->y2 = baseBox->y1 + kx * (sliceX + sliceW);
 773     } else if (rotate == 180) {
 774       box->x1 = baseBox->x2 - kx * (sliceX + sliceW);
 775       box->x2 = baseBox->x2 - kx * sliceX;
 776       if (upsideDown) {
 777         box->y1 = baseBox->y1 + ky * sliceY;
 778         box->y2 = baseBox->y1 + ky * (sliceY + sliceH);
 779       } else {
 780         box->y1 = baseBox->y2 - ky * (sliceY + sliceH);
 781         box->y2 = baseBox->y2 - ky * sliceY;
 782       }
 783     } else if (rotate == 270) {
 784       if (upsideDown) {
 785         box->x1 = baseBox->x2 - ky * (sliceY + sliceH);
 786         box->x2 = baseBox->x2 - ky * sliceY;
 787       } else {
 788         box->x1 = baseBox->x1 + ky * sliceY;
 789         box->x2 = baseBox->x1 + ky * (sliceY + sliceH);
 790       }
 791       box->y1 = baseBox->y2 - kx * (sliceX + sliceW);
 792       box->y2 = baseBox->y2 - kx * sliceX;
 793     } else {
 794       box->x1 = baseBox->x1 + kx * sliceX;
 795       box->x2 = baseBox->x1 + kx * (sliceX + sliceW);
 796       if (upsideDown) {
 797         box->y1 = baseBox->y2 - ky * (sliceY + sliceH);
 798         box->y2 = baseBox->y2 - ky * sliceY;
 799       } else {
 800         box->y1 = baseBox->y1 + ky * sliceY;
 801         box->y2 = baseBox->y1 + ky * (sliceY + sliceH);
 802       }
 803     }
 804   } else if (useMediaBox) {
 805     *box = *mediaBox;
 806   } else {
 807     *box = *cropBox;
 808     *crop = gFalse;
 809   }
 810 }
 811
 812 void Page::processLinks(OutputDev *out) {
 813   Links *links;
 814   int i;
 815
 816   links = getLinks();
 817   for (i = 0; i < links->getNumLinks(); ++i) {
 818     out->processLink(links->getLink(i));
 819   }
 820   delete links;
 821 }
 822
 823 void Page::getDefaultCTM(double *ctm, double hDPI, double vDPI,
 824                          int rotate, GBool useMediaBox, GBool upsideDown) {
 825   GfxState *state;
 826   int i;
 827   rotate += getRotate();
 828   if (rotate >= 360) {
 829     rotate -= 360;
 830   } else if (rotate < 0) {
 831     rotate += 360;
 832   }
 833   state = new GfxState(hDPI, vDPI,
 834                        useMediaBox ? getMediaBox() : getCropBox(),
 835                        rotate, upsideDown);
 836   for (i = 0; i < 6; ++i) {
 837     ctm[i] = state->getCTM()[i];
 838   }
 839  delete state;
 840 }
 841
 842 LinkAction* Page::getAdditionalAction(PageAdditionalActionsType type) {
 843   Object additionalActionsObject;
 844   LinkAction *linkAction = NULL;
 845
 846   if (actions.fetch(doc->getXRef(), &additionalActionsObject)->isDict()) {
 847     const char *key = (type == actionOpenPage ?  "O" :
 848                        type == actionClosePage ? "C" : NULL);
 849
 850     Object actionObject;
 851
 852     if (additionalActionsObject.dictLookup(key, &actionObject)->isDict())
 853       linkAction = LinkAction::parseAction(&actionObject, doc->getCatalog()->getBaseURI());
 854     actionObject.free();
 855   }
 856
 857   additionalActionsObject.free();
 858
 859   return linkAction;
 860 }