blob: 3ec4877b9825b69fee65ac640633838fcc044f18 [file] [log] [blame]
/*
* 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"
// Add the resources, starting at firstIndex to the catalog, removing any dupes.
// A hash table would be really nice here.
void addResourcesToCatalog(int firstIndex, bool firstPage,
SkTDArray<SkPDFObject*>* resourceList,
SkPDFCatalog* catalog) {
for (int i = firstIndex; i < resourceList->count(); i++) {
int index = resourceList->find((*resourceList)[i]);
if (index != i) {
(*resourceList)[i]->unref();
resourceList->removeShuffle(i);
i--;
} else {
catalog->addObject((*resourceList)[i], firstPage);
}
}
}
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);
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(Flags flags)
: fXRefFileOffset(0),
fSecondPageFirstResourceIndex(0) {
fCatalog.reset(new SkPDFCatalog(flags));
fDocCatalog = new SkPDFDict("Catalog");
fDocCatalog->unref(); // SkRefPtr and new both took a reference.
fCatalog->addObject(fDocCatalog.get(), true);
}
SkPDFDocument::~SkPDFDocument() {
fPages.safeUnrefAll();
// 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 < fPageTree.count(); i++) {
fPageTree[i]->clear();
}
fPageTree.safeUnrefAll();
fPageResources.safeUnrefAll();
fSubstitutes.safeUnrefAll();
}
bool SkPDFDocument::emitPDF(SkWStream* stream) {
if (fPages.isEmpty()) {
return false;
}
for (int i = 0; i < fPages.count(); i++) {
if (fPages[i] == NULL) {
return false;
}
}
// We haven't emitted the document before if fPageTree is empty.
if (fPageTree.isEmpty()) {
SkPDFDict* pageTreeRoot;
SkPDFPage::GeneratePageTree(fPages, fCatalog.get(), &fPageTree,
&pageTreeRoot);
fDocCatalog->insert("Pages", new SkPDFObjRef(pageTreeRoot))->unref();
/* TODO(vandebo): output intent
SkRefPtr<SkPDFDict> outputIntent = new SkPDFDict("OutputIntent");
outputIntent->unref(); // SkRefPtr and new both took a reference.
outputIntent->insert("S", new SkPDFName("GTS_PDFA1"))->unref();
outputIntent->insert("OutputConditionIdentifier",
new SkPDFString("sRGB"))->unref();
SkRefPtr<SkPDFArray> intentArray = new SkPDFArray;
intentArray->unref(); // SkRefPtr and new both took a reference.
intentArray->append(outputIntent.get());
fDocCatalog->insert("OutputIntent", intentArray.get());
*/
bool firstPage = true;
for (int i = 0; i < fPages.count(); i++) {
int resourceCount = fPageResources.count();
fPages[i]->finalizePage(fCatalog.get(), firstPage, &fPageResources);
addResourcesToCatalog(resourceCount, firstPage, &fPageResources,
fCatalog.get());
if (i == 0) {
firstPage = false;
fSecondPageFirstResourceIndex = fPageResources.count();
}
}
// Build font subsetting info before proceeding.
perform_font_subsetting(fCatalog.get(), fPages, &fSubstitutes);
// Figure out the size of things and inform the catalog of file offsets.
off_t fileOffset = headerSize();
fileOffset += fCatalog->setFileOffset(fDocCatalog.get(), fileOffset);
fileOffset += fCatalog->setFileOffset(fPages[0], fileOffset);
fileOffset += fPages[0]->getPageSize(fCatalog.get(), fileOffset);
for (int i = 0; i < fSecondPageFirstResourceIndex; i++) {
fileOffset += fCatalog->setFileOffset(fPageResources[i],
fileOffset);
}
// Add the size of resources of substitute objects used on page 1.
fileOffset += fCatalog->setSubstituteResourcesOffsets(fileOffset, true);
if (fPages.count() > 1) {
// TODO(vandebo): For linearized format, save the start of the
// first page xref table and calculate the size.
}
for (int i = 0; i < fPageTree.count(); i++) {
fileOffset += fCatalog->setFileOffset(fPageTree[i], fileOffset);
}
for (int i = 1; i < fPages.count(); i++) {
fileOffset += fPages[i]->getPageSize(fCatalog.get(), fileOffset);
}
for (int i = fSecondPageFirstResourceIndex;
i < fPageResources.count();
i++) {
fileOffset += fCatalog->setFileOffset(fPageResources[i],
fileOffset);
}
fileOffset += fCatalog->setSubstituteResourcesOffsets(fileOffset,
false);
fXRefFileOffset = fileOffset;
}
emitHeader(stream);
fDocCatalog->emitObject(stream, fCatalog.get(), true);
fPages[0]->emitObject(stream, fCatalog.get(), true);
fPages[0]->emitPage(stream, fCatalog.get());
for (int i = 0; i < fSecondPageFirstResourceIndex; i++) {
fPageResources[i]->emit(stream, fCatalog.get(), true);
}
fCatalog->emitSubstituteResources(stream, true);
// TODO(vandebo): Support linearized format
// if (fPages.size() > 1) {
// // TODO(vandebo): Save the file offset for the first page xref table.
// fCatalog->emitXrefTable(stream, true);
// }
for (int i = 0; i < fPageTree.count(); i++) {
fPageTree[i]->emitObject(stream, fCatalog.get(), true);
}
for (int i = 1; i < fPages.count(); i++) {
fPages[i]->emitPage(stream, fCatalog.get());
}
for (int i = fSecondPageFirstResourceIndex;
i < fPageResources.count();
i++) {
fPageResources[i]->emit(stream, fCatalog.get(), true);
}
fCatalog->emitSubstituteResources(stream, false);
int64_t objCount = fCatalog->emitXrefTable(stream, fPages.count() > 1);
emitFooter(stream, objCount);
return true;
}
bool SkPDFDocument::setPage(int pageNumber, SkPDFDevice* pdfDevice) {
if (!fPageTree.isEmpty()) {
return false;
}
pageNumber--;
SkASSERT(pageNumber >= 0);
if (pageNumber >= fPages.count()) {
int oldSize = fPages.count();
fPages.setCount(pageNumber + 1);
for (int i = oldSize; i <= pageNumber; i++) {
fPages[i] = NULL;
}
}
SkPDFPage* page = new SkPDFPage(pdfDevice);
SkSafeUnref(fPages[pageNumber]);
fPages[pageNumber] = page; // Reference from new passed to fPages.
return true;
}
bool SkPDFDocument::appendPage(SkPDFDevice* pdfDevice) {
if (!fPageTree.isEmpty()) {
return false;
}
SkPDFPage* page = new SkPDFPage(pdfDevice);
fPages.push(page); // Reference from new passed to fPages.
return true;
}
void SkPDFDocument::getCountOfFontTypes(
int counts[SkAdvancedTypefaceMetrics::kNotEmbeddable_Font + 1]) const {
memset(counts, 0,
sizeof(int)* SkAdvancedTypefaceMetrics::kNotEmbeddable_Font + 1);
SkTDArray<SkFontID> seenFonts;
for (int pageNumber = 0; pageNumber < fPages.count(); pageNumber++) {
const SkTDArray<SkPDFFont*>& fontResources =
fPages[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);
}
}
}
}
void SkPDFDocument::emitHeader(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");
}
size_t SkPDFDocument::headerSize() {
SkDynamicMemoryWStream buffer;
emitHeader(&buffer);
return buffer.getOffset();
}
void SkPDFDocument::emitFooter(SkWStream* stream, int64_t objCount) {
if (fTrailerDict.get() == NULL) {
fTrailerDict = new SkPDFDict();
fTrailerDict->unref(); // SkRefPtr and new both took a reference.
// TODO(vandebo): Linearized format will take a Prev entry too.
// TODO(vandebo): PDF/A requires an ID entry.
fTrailerDict->insertInt("Size", objCount);
fTrailerDict->insert("Root",
new SkPDFObjRef(fDocCatalog.get()))->unref();
}
stream->writeText("trailer\n");
fTrailerDict->emitObject(stream, fCatalog.get(), false);
stream->writeText("\nstartxref\n");
stream->writeBigDecAsText(fXRefFileOffset);
stream->writeText("\n%%EOF");
}