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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkPDFCatalog.h"
#include "SkPDFDevice.h"
#include "SkPDFDocument.h"
#include "SkPDFFont.h"
#include "SkPDFPage.h"
#include "SkPDFTypes.h"
#include "SkStream.h"
static void perform_font_subsetting(SkPDFCatalog* catalog,
const SkTDArray<SkPDFPage*>& pages,
SkTDArray<SkPDFObject*>* substitutes) {
SkASSERT(catalog);
SkASSERT(substitutes);
SkPDFGlyphSetMap usage;
for (int i = 0; i < pages.count(); ++i) {
usage.merge(pages[i]->getFontGlyphUsage());
}
SkPDFGlyphSetMap::F2BIter iterator(usage);
const SkPDFGlyphSetMap::FontGlyphSetPair* entry = iterator.next();
while (entry) {
SkPDFFont* subsetFont =
entry->fFont->getFontSubset(entry->fGlyphSet);
if (subsetFont) {
catalog->setSubstitute(entry->fFont, subsetFont);
substitutes->push(subsetFont); // Transfer ownership to substitutes
}
entry = iterator.next();
}
}
SkPDFDocument::SkPDFDocument() {}
SkPDFDocument::~SkPDFDocument() { fPageDevices.unrefAll(); }
static void emit_pdf_header(SkWStream* stream) {
stream->writeText("%PDF-1.4\n%");
// The PDF spec recommends including a comment with four bytes, all
// with their high bits set. This is "Skia" with the high bits set.
stream->write32(0xD3EBE9E1);
stream->writeText("\n");
}
static void emit_pdf_footer(SkWStream* stream,
SkPDFCatalog* catalog,
SkPDFObject* docCatalog,
int64_t objCount,
int32_t xRefFileOffset) {
SkPDFDict trailerDict;
// TODO(vandebo): Linearized format will take a Prev entry too.
// TODO(vandebo): PDF/A requires an ID entry.
trailerDict.insertInt("Size", int(objCount));
trailerDict.insert("Root", new SkPDFObjRef(docCatalog))->unref();
stream->writeText("trailer\n");
trailerDict.emitObject(stream, catalog);
stream->writeText("\nstartxref\n");
stream->writeBigDecAsText(xRefFileOffset);
stream->writeText("\n%%EOF");
}
bool SkPDFDocument::emitPDF(SkWStream* stream) {
// SkTDArray<SkPDFDevice*> fPageDevices;
if (fPageDevices.isEmpty()) {
return false;
}
SkTDArray<SkPDFPage*> pages;
for (int i = 0; i < fPageDevices.count(); i++) {
// Reference from new passed to pages.
pages.push(SkNEW_ARGS(SkPDFPage, (fPageDevices[i])));
}
SkPDFCatalog catalog;
SkTDArray<SkPDFDict*> pageTree;
SkAutoTUnref<SkPDFDict> docCatalog(SkNEW_ARGS(SkPDFDict, ("Catalog")));
SkTSet<SkPDFObject*> firstPageResources;
SkTSet<SkPDFObject*> otherPageResources;
SkTDArray<SkPDFObject*> substitutes;
catalog.addObject(docCatalog.get(), true);
SkPDFDict* pageTreeRoot;
SkPDFPage::GeneratePageTree(pages, &catalog, &pageTree, &pageTreeRoot);
docCatalog->insert("Pages", new SkPDFObjRef(pageTreeRoot))->unref();
/* TODO(vandebo): output intent
SkAutoTUnref<SkPDFDict> outputIntent = new SkPDFDict("OutputIntent");
outputIntent->insert("S", new SkPDFName("GTS_PDFA1"))->unref();
outputIntent->insert("OutputConditionIdentifier",
new SkPDFString("sRGB"))->unref();
SkAutoTUnref<SkPDFArray> intentArray = new SkPDFArray;
intentArray->append(outputIntent.get());
docCatalog->insert("OutputIntent", intentArray.get());
*/
SkAutoTUnref<SkPDFDict> dests(SkNEW(SkPDFDict));
bool firstPage = true;
/* The references returned in newResources are transfered to
* firstPageResources or otherPageResources depending on firstPage and
* knownResources doesn't have a reference but just relies on the other
* two sets to maintain a reference.
*/
SkTSet<SkPDFObject*> knownResources;
// mergeInto returns the number of duplicates.
// If there are duplicates, there is a bug and we mess ref counting.
SkDEBUGCODE(int duplicates = ) knownResources.mergeInto(firstPageResources);
SkASSERT(duplicates == 0);
for (int i = 0; i < pages.count(); i++) {
if (i == 1) {
firstPage = false;
SkDEBUGCODE(duplicates = )
knownResources.mergeInto(otherPageResources);
}
SkTSet<SkPDFObject*> newResources;
pages[i]->finalizePage(&catalog, firstPage, knownResources,
&newResources);
for (int j = 0; j < newResources.count(); j++) {
catalog.addObject(newResources[i], firstPage);
}
if (firstPage) {
SkDEBUGCODE(duplicates = )
firstPageResources.mergeInto(newResources);
} else {
SkDEBUGCODE(duplicates = )
otherPageResources.mergeInto(newResources);
}
SkASSERT(duplicates == 0);
SkDEBUGCODE(duplicates = ) knownResources.mergeInto(newResources);
SkASSERT(duplicates == 0);
pages[i]->appendDestinations(dests);
}
if (dests->size() > 0) {
SkPDFDict* raw_dests = dests.get();
firstPageResources.add(dests.detach()); // Transfer ownership.
catalog.addObject(raw_dests, true /* onFirstPage */);
docCatalog->insert("Dests", SkNEW_ARGS(SkPDFObjRef, (raw_dests)))
->unref();
}
// Build font subsetting info before proceeding.
perform_font_subsetting(&catalog, pages, &substitutes);
SkTSet<SkPDFObject*> resourceSet;
if (resourceSet.add(docCatalog.get())) {
docCatalog->addResources(&resourceSet, &catalog);
}
size_t baseOffset = SkToOffT(stream->bytesWritten());
emit_pdf_header(stream);
for (int i = 0; i < resourceSet.count(); ++i) {
SkPDFObject* object = resourceSet[i];
catalog.setFileOffset(object,
SkToOffT(stream->bytesWritten() - baseOffset));
SkASSERT(object == catalog.getSubstituteObject(object));
stream->writeDecAsText(catalog.getObjectNumber(object));
stream->writeText(" 0 obj\n"); // Generation number is always 0.
object->emitObject(stream, &catalog);
stream->writeText("\nendobj\n");
}
int32_t xRefFileOffset = SkToS32(stream->bytesWritten() - baseOffset);
int64_t objCount = catalog.emitXrefTable(stream, pages.count() > 1);
emit_pdf_footer(stream, &catalog, 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();
firstPageResources.safeUnrefAll();
otherPageResources.safeUnrefAll();
substitutes.unrefAll();
docCatalog.reset(NULL);
return true;
}
// TODO(halcanary): expose notEmbeddableCount in SkDocument
void SkPDFDocument::getCountOfFontTypes(
int counts[SkAdvancedTypefaceMetrics::kOther_Font + 1],
int* notSubsettableCount,
int* notEmbeddableCount) const {
sk_bzero(counts, sizeof(int) *
(SkAdvancedTypefaceMetrics::kOther_Font + 1));
SkTDArray<SkFontID> seenFonts;
int notSubsettable = 0;
int notEmbeddable = 0;
for (int pageNumber = 0; pageNumber < fPageDevices.count(); pageNumber++) {
const SkTDArray<SkPDFFont*>& fontResources =
fPageDevices[pageNumber]->getFontResources();
for (int font = 0; font < fontResources.count(); font++) {
SkFontID fontID = fontResources[font]->typeface()->uniqueID();
if (seenFonts.find(fontID) == -1) {
counts[fontResources[font]->getType()]++;
seenFonts.push(fontID);
if (!fontResources[font]->canSubset()) {
notSubsettable++;
}
if (!fontResources[font]->canEmbed()) {
notEmbeddable++;
}
}
}
}
if (notSubsettableCount) {
*notSubsettableCount = notSubsettable;
}
if (notEmbeddableCount) {
*notEmbeddableCount = notEmbeddable;
}
}
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