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/*
* Copyright 2010 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkPDFCatalog.h"
#include "SkPDFTypes.h"
#include "SkStream.h"
#include "SkTypes.h"
SkPDFCatalog::SkPDFCatalog(SkPDFDocument::Flags flags)
: fFirstPageCount(0),
fNextObjNum(1),
fNextFirstPageObjNum(0),
fDocumentFlags(flags) {
}
SkPDFCatalog::~SkPDFCatalog() {
fSubstituteResourcesRemaining.safeUnrefAll();
fSubstituteResourcesFirstPage.safeUnrefAll();
}
SkPDFObject* SkPDFCatalog::addObject(SkPDFObject* obj, bool onFirstPage) {
if (findObjectIndex(obj) != -1) { // object already added
return obj;
}
SkASSERT(fNextFirstPageObjNum == 0);
if (onFirstPage) {
fFirstPageCount++;
}
struct Rec newEntry(obj, onFirstPage);
fCatalog.append(1, &newEntry);
return obj;
}
size_t SkPDFCatalog::setFileOffset(SkPDFObject* obj, off_t offset) {
int objIndex = assignObjNum(obj) - 1;
SkASSERT(fCatalog[objIndex].fObjNumAssigned);
SkASSERT(fCatalog[objIndex].fFileOffset == 0);
fCatalog[objIndex].fFileOffset = offset;
return getSubstituteObject(obj)->getOutputSize(this, true);
}
void SkPDFCatalog::emitObjectNumber(SkWStream* stream, SkPDFObject* obj) {
stream->writeDecAsText(assignObjNum(obj));
stream->writeText(" 0"); // Generation number is always 0.
}
size_t SkPDFCatalog::getObjectNumberSize(SkPDFObject* obj) {
SkDynamicMemoryWStream buffer;
emitObjectNumber(&buffer, obj);
return buffer.getOffset();
}
int SkPDFCatalog::findObjectIndex(SkPDFObject* obj) const {
for (int i = 0; i < fCatalog.count(); i++) {
if (fCatalog[i].fObject == obj) {
return i;
}
}
// If it's not in the main array, check if it's a substitute object.
for (int i = 0; i < fSubstituteMap.count(); ++i) {
if (fSubstituteMap[i].fSubstitute == obj) {
return findObjectIndex(fSubstituteMap[i].fOriginal);
}
}
return -1;
}
int SkPDFCatalog::assignObjNum(SkPDFObject* obj) {
int pos = findObjectIndex(obj);
// If this assert fails, it means you probably forgot to add an object
// to the resource list.
SkASSERT(pos >= 0);
uint32_t currentIndex = pos;
if (fCatalog[currentIndex].fObjNumAssigned) {
return currentIndex + 1;
}
// First assignment.
if (fNextFirstPageObjNum == 0) {
fNextFirstPageObjNum = fCatalog.count() - fFirstPageCount + 1;
}
uint32_t objNum;
if (fCatalog[currentIndex].fOnFirstPage) {
objNum = fNextFirstPageObjNum;
fNextFirstPageObjNum++;
} else {
objNum = fNextObjNum;
fNextObjNum++;
}
// When we assign an object an object number, we put it in that array
// offset (minus 1 because object number 0 is reserved).
SkASSERT(!fCatalog[objNum - 1].fObjNumAssigned);
if (objNum - 1 != currentIndex) {
SkTSwap(fCatalog[objNum - 1], fCatalog[currentIndex]);
}
fCatalog[objNum - 1].fObjNumAssigned = true;
return objNum;
}
int32_t SkPDFCatalog::emitXrefTable(SkWStream* stream, bool firstPage) {
int first = -1;
int last = fCatalog.count() - 1;
// TODO(vandebo): Support linearized format.
// int last = fCatalog.count() - fFirstPageCount - 1;
// if (firstPage) {
// first = fCatalog.count() - fFirstPageCount;
// last = fCatalog.count() - 1;
// }
stream->writeText("xref\n");
stream->writeDecAsText(first + 1);
stream->writeText(" ");
stream->writeDecAsText(last - first + 1);
stream->writeText("\n");
if (first == -1) {
stream->writeText("0000000000 65535 f \n");
first++;
}
for (int i = first; i <= last; i++) {
// For 32 bits platforms, the maximum offset has to fit within off_t
// which is a 32 bits signed integer on these platforms.
SkDEBUGCODE(static const off_t kMaxOff = SK_MaxS32;)
SkASSERT(fCatalog[i].fFileOffset > 0);
SkASSERT(fCatalog[i].fFileOffset < kMaxOff);
stream->writeBigDecAsText(fCatalog[i].fFileOffset, 10);
stream->writeText(" 00000 n \n");
}
return fCatalog.count() + 1;
}
void SkPDFCatalog::setSubstitute(SkPDFObject* original,
SkPDFObject* substitute) {
#if defined(SK_DEBUG)
// Sanity check: is the original already in substitute list?
for (int i = 0; i < fSubstituteMap.count(); ++i) {
if (original == fSubstituteMap[i].fSubstitute ||
original == fSubstituteMap[i].fOriginal) {
SkASSERT(false);
return;
}
}
#endif
// Check if the original is on first page.
bool onFirstPage = false;
for (int i = 0; i < fCatalog.count(); ++i) {
if (fCatalog[i].fObject == original) {
onFirstPage = fCatalog[i].fOnFirstPage;
break;
}
#if defined(SK_DEBUG)
if (i == fCatalog.count() - 1) {
SkASSERT(false); // original not in catalog
return;
}
#endif
}
SubstituteMapping newMapping(original, substitute);
fSubstituteMap.append(1, &newMapping);
// Add resource objects of substitute object to catalog.
SkTSet<SkPDFObject*>* targetSet = getSubstituteList(onFirstPage);
SkTSet<SkPDFObject*> newResourceObjects;
newMapping.fSubstitute->getResources(*targetSet, &newResourceObjects);
for (int i = 0; i < newResourceObjects.count(); ++i) {
addObject(newResourceObjects[i], onFirstPage);
}
// mergeInto returns the number of duplicates.
// If there are duplicates, there is a bug and we mess ref counting.
SkDEBUGCODE(int duplicates =) targetSet->mergeInto(newResourceObjects);
SkASSERT(duplicates == 0);
}
SkPDFObject* SkPDFCatalog::getSubstituteObject(SkPDFObject* object) {
for (int i = 0; i < fSubstituteMap.count(); ++i) {
if (object == fSubstituteMap[i].fOriginal) {
return fSubstituteMap[i].fSubstitute;
}
}
return object;
}
off_t SkPDFCatalog::setSubstituteResourcesOffsets(off_t fileOffset,
bool firstPage) {
SkTSet<SkPDFObject*>* targetSet = getSubstituteList(firstPage);
off_t offsetSum = fileOffset;
for (int i = 0; i < targetSet->count(); ++i) {
offsetSum += setFileOffset((*targetSet)[i], offsetSum);
}
return offsetSum - fileOffset;
}
void SkPDFCatalog::emitSubstituteResources(SkWStream *stream, bool firstPage) {
SkTSet<SkPDFObject*>* targetSet = getSubstituteList(firstPage);
for (int i = 0; i < targetSet->count(); ++i) {
(*targetSet)[i]->emit(stream, this, true);
}
}
SkTSet<SkPDFObject*>* SkPDFCatalog::getSubstituteList(bool firstPage) {
return firstPage ? &fSubstituteResourcesFirstPage :
&fSubstituteResourcesRemaining;
}
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