SkPDF: merge skdocument_pdf and skpdfdocument

src/pdf/SkPDFDocument.cpp

-
-/*
- * 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) {
-    SkASSERT(catalog);
-
-    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) {
-        SkAutoTUnref<SkPDFFont> subsetFont(
-                entry->fFont->getFontSubset(entry->fGlyphSet));
-        if (subsetFont) {
-            catalog->setSubstitute(entry->fFont, subsetFont.get());
-        }
-        entry = iterator.next();
-    }
-}
-
-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(const SkTDArray<const SkPDFDevice*>& pageDevices,
-                            SkWStream* stream) {
-    if (pageDevices.isEmpty()) {
-        return false;
-    }
-
-    SkTDArray<SkPDFPage*> 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());
-        // Reference from new passed to pages.
-        SkAutoTUnref<SkPDFPage> page(SkNEW_ARGS(SkPDFPage, (pageDevices[i])));
-        page->finalizePage();
-        page->appendDestinations(dests);
-        pages.push(page.detach());
-    }
-    SkPDFCatalog catalog;
-
-    SkTDArray<SkPDFDict*> pageTree;
-    SkAutoTUnref<SkPDFDict> docCatalog(SkNEW_ARGS(SkPDFDict, ("Catalog")));
-
-    SkPDFDict* pageTreeRoot;
-    SkPDFPage::GeneratePageTree(pages, &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());
-    */
-
-    if (dests->size() > 0) {
-        docCatalog->insert("Dests", SkNEW_ARGS(SkPDFObjRef, (dests.get())))
-                ->unref();
-    }
-
-    // Build font subsetting info before proceeding.
-    perform_font_subsetting(&catalog, pages);
-
-    SkTSet<SkPDFObject*> resourceSet;
-    if (resourceSet.add(docCatalog.get())) {
-        docCatalog->addResources(&resourceSet, &catalog);
-    }
-    for (int i = 0; i < resourceSet.count(); ++i) {
-        SkAssertResult(catalog.addObject(resourceSet[i]));
-    }
-
-    size_t baseOffset = SkToOffT(stream->bytesWritten());
-    emit_pdf_header(stream);
-    SkTDArray<int32_t> offsets;
-    for (int i = 0; i < resourceSet.count(); ++i) {
-        SkPDFObject* object = resourceSet[i];
-        offsets.push(SkToS32(stream->bytesWritten() - baseOffset));
-        SkASSERT(object == catalog.getSubstituteObject(object));
-        SkASSERT(catalog.getObjectNumber(object) == i + 1);
-        stream->writeDecAsText(i + 1);
-        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);
-
-    int32_t objCount = SkToS32(offsets.count() + 1);
-
-    stream->writeText("xref\n0 ");
-    stream->writeDecAsText(objCount + 1);
-    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, &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();
-    return true;
-}
-
-// TODO(halcanary): expose notEmbeddableCount in SkDocument
-void SkPDFDocument::GetCountOfFontTypes(
-        const SkTDArray<SkPDFDevice*>& pageDevices,
-        int counts[SkAdvancedTypefaceMetrics::kOther_Font + 1],
-        int* notSubsettableCount,
-        int* notEmbeddableCount) {
-    sk_bzero(counts, sizeof(int) *
-                     (SkAdvancedTypefaceMetrics::kOther_Font + 1));
-    SkTDArray<SkFontID> seenFonts;
-    int notSubsettable = 0;
-    int notEmbeddable = 0;
-
-    for (int pageNumber = 0; pageNumber < pageDevices.count(); pageNumber++) {
-        const SkTDArray<SkPDFFont*>& fontResources =
-                pageDevices[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;
-    }
-}