static bool emit_pdf_document(const SkTDArray<const SkPDFDevice*>& pageDevices,
SkWStream* stream) {
if (pageDevices.isEmpty()) {
return false;
}
SkTDArray<SkPDFDict*> pages;
SkAutoTUnref<SkPDFDict> dests(SkNEW(SkPDFDict));
for (int i = 0; i < pageDevices.count(); i++) {
SkASSERT(pageDevices[i]);
SkASSERT(i == 0 ||
pageDevices[i - 1]->getCanon() == pageDevices[i]->getCanon());
SkAutoTUnref<SkPDFDict> page(create_pdf_page(pageDevices[i]));
pageDevices[i]->appendDestinations(dests, page.get());
pages.push(page.detach());
}
SkTDArray<SkPDFDict*> pageTree;
SkAutoTUnref<SkPDFDict> docCatalog(SkNEW_ARGS(SkPDFDict, ("Catalog")));
SkPDFDict* pageTreeRoot;
generate_page_tree(pages, &pageTree, &pageTreeRoot);
docCatalog->insertObjRef("Pages", SkRef(pageTreeRoot));
if (dests->size() > 0) {
docCatalog->insertObjRef("Dests", dests.detach());
}
/* TODO(vandebo): output intent
SkAutoTUnref<SkPDFDict> outputIntent = new SkPDFDict("OutputIntent");
outputIntent->insertName("S", "GTS_PDFA1");
outputIntent->insertString("OutputConditionIdentifier", "sRGB");
SkAutoTUnref<SkPDFArray> intentArray(new SkPDFArray);
intentArray->appendObject(SkRef(outputIntent.get()));
docCatalog->insertObject("OutputIntent", intentArray.detach());
*/
// Build font subsetting info before proceeding.
SkPDFSubstituteMap substitutes;
perform_font_subsetting(pageDevices, &substitutes);
SkPDFObjNumMap objNumMap;
if (objNumMap.addObject(docCatalog.get())) {
docCatalog->addResources(&objNumMap, substitutes);
}
size_t baseOffset = stream->bytesWritten();
emit_pdf_header(stream);
SkTDArray<int32_t> offsets;
for (int i = 0; i < objNumMap.objects().count(); ++i) {
SkPDFObject* object = objNumMap.objects()[i];
size_t offset = stream->bytesWritten();
// This assert checks that size(pdf_header) > 0 and that
// the output stream correctly reports bytesWritten().
SkASSERT(offset > baseOffset);
offsets.push(SkToS32(offset - baseOffset));
SkASSERT(object == substitutes.getSubstitute(object));
SkASSERT(objNumMap.getObjectNumber(object) == i + 1);
stream->writeDecAsText(i + 1);
stream->writeText(" 0 obj\n"); // Generation number is always 0.
object->emitObject(stream, objNumMap, substitutes);
stream->writeText("\nendobj\n");
}
int32_t xRefFileOffset = SkToS32(stream->bytesWritten() - baseOffset);
// Include the zeroth object in the count.
int32_t objCount = SkToS32(offsets.count() + 1);
stream->writeText("xref\n0 ");
stream->writeDecAsText(objCount);
stream->writeText("\n0000000000 65535 f \n");
for (int i = 0; i < offsets.count(); i++) {
SkASSERT(offsets[i] > 0);
stream->writeBigDecAsText(offsets[i], 10);
stream->writeText(" 00000 n \n");
}
emit_pdf_footer(stream, objNumMap, substitutes, docCatalog.get(), objCount,
xRefFileOffset);
// The page tree has both child and parent pointers, so it creates a
// reference cycle. We must clear that cycle to properly reclaim memory.
for (int i = 0; i < pageTree.count(); i++) {
pageTree[i]->clear();
}
pageTree.safeUnrefAll();
pages.unrefAll();
return true;
}
