blob: 74c78af4085874f04b1551cd3aea1a5f79f17486 [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 "SkPDFDocument.h"
#include "SkMakeUnique.h"
#include "SkPDFCanon.h"
#include "SkPDFDevice.h"
#include "SkPDFUtils.h"
#include "SkStream.h"
#include "SkTo.h"
#include <utility>
SkPDFObjectSerializer::SkPDFObjectSerializer() : fBaseOffset(0), fNextToBeSerialized(0) {}
SkPDFObjectSerializer::~SkPDFObjectSerializer() {
for (const sk_sp<SkPDFObject>& obj: fObjNumMap.objects()) {
obj->drop();
}
}
SkPDFObjectSerializer::SkPDFObjectSerializer(SkPDFObjectSerializer&&) = default;
SkPDFObjectSerializer& SkPDFObjectSerializer::operator=(SkPDFObjectSerializer&&) = default;
void SkPDFObjectSerializer::addObjectRecursively(const sk_sp<SkPDFObject>& object) {
fObjNumMap.addObjectRecursively(object.get());
}
#define SKPDF_MAGIC "\xD3\xEB\xE9\xE1"
#ifndef SK_BUILD_FOR_WIN
static_assert((SKPDF_MAGIC[0] & 0x7F) == "Skia"[0], "");
static_assert((SKPDF_MAGIC[1] & 0x7F) == "Skia"[1], "");
static_assert((SKPDF_MAGIC[2] & 0x7F) == "Skia"[2], "");
static_assert((SKPDF_MAGIC[3] & 0x7F) == "Skia"[3], "");
#endif
void SkPDFObjectSerializer::serializeHeader(SkWStream* wStream,
const SkDocument::PDFMetadata& md) {
fBaseOffset = wStream->bytesWritten();
static const char kHeader[] = "%PDF-1.4\n%" SKPDF_MAGIC "\n";
wStream->writeText(kHeader);
// The PDF spec recommends including a comment with four
// bytes, all with their high bits set. "\xD3\xEB\xE9\xE1" is
// "Skia" with the high bits set.
fInfoDict = SkPDFMetadata::MakeDocumentInformationDict(md);
this->addObjectRecursively(fInfoDict);
this->serializeObjects(wStream);
}
#undef SKPDF_MAGIC
// Serialize all objects in the fObjNumMap that have not yet been serialized;
void SkPDFObjectSerializer::serializeObjects(SkWStream* wStream) {
const std::vector<sk_sp<SkPDFObject>>& objects = fObjNumMap.objects();
while (fNextToBeSerialized < objects.size()) {
SkPDFObject* object = objects[fNextToBeSerialized].get();
// Maximum number of indirect objects is 2^23-1.
int32_t index = SkToS32(fNextToBeSerialized + 1); // Skip object 0.
// "The first entry in the [XREF] table (object number 0) is
// always free and has a generation number of 65,535; it is
// the head of the linked list of free objects."
SkASSERT(fOffsets.size() == fNextToBeSerialized);
fOffsets.push_back(this->offset(wStream));
wStream->writeDecAsText(index);
wStream->writeText(" 0 obj\n"); // Generation number is always 0.
object->emitObject(wStream, fObjNumMap);
wStream->writeText("\nendobj\n");
object->drop();
++fNextToBeSerialized;
}
}
// Xref table and footer
void SkPDFObjectSerializer::serializeFooter(SkWStream* wStream,
const sk_sp<SkPDFObject> docCatalog,
sk_sp<SkPDFObject> id) {
this->serializeObjects(wStream);
int32_t xRefFileOffset = this->offset(wStream);
// Include the special zeroth object in the count.
int32_t objCount = SkToS32(fOffsets.size() + 1);
wStream->writeText("xref\n0 ");
wStream->writeDecAsText(objCount);
wStream->writeText("\n0000000000 65535 f \n");
for (size_t i = 0; i < fOffsets.size(); i++) {
wStream->writeBigDecAsText(fOffsets[i], 10);
wStream->writeText(" 00000 n \n");
}
SkPDFDict trailerDict;
trailerDict.insertInt("Size", objCount);
SkASSERT(docCatalog);
trailerDict.insertObjRef("Root", docCatalog);
SkASSERT(fInfoDict);
trailerDict.insertObjRef("Info", std::move(fInfoDict));
if (id) {
trailerDict.insertObject("ID", std::move(id));
}
wStream->writeText("trailer\n");
trailerDict.emitObject(wStream, fObjNumMap);
wStream->writeText("\nstartxref\n");
wStream->writeBigDecAsText(xRefFileOffset);
wStream->writeText("\n%%EOF");
}
int32_t SkPDFObjectSerializer::offset(SkWStream* wStream) {
size_t offset = wStream->bytesWritten();
SkASSERT(offset > fBaseOffset);
return SkToS32(offset - fBaseOffset);
}
// return root node.
static sk_sp<SkPDFDict> generate_page_tree(std::vector<sk_sp<SkPDFDict>>* pages) {
// PDF wants a tree describing all the pages in the document. We arbitrary
// choose 8 (kNodeSize) as the number of allowed children. The internal
// nodes have type "Pages" with an array of children, a parent pointer, and
// the number of leaves below the node as "Count." The leaves are passed
// into the method, have type "Page" and need a parent pointer. This method
// builds the tree bottom up, skipping internal nodes that would have only
// one child.
static const int kNodeSize = 8;
// curNodes takes a reference to its items, which it passes to pageTree.
size_t totalPageCount = pages->size();
std::vector<sk_sp<SkPDFDict>> curNodes;
curNodes.swap(*pages);
// nextRoundNodes passes its references to nodes on to curNodes.
int treeCapacity = kNodeSize;
do {
std::vector<sk_sp<SkPDFDict>> nextRoundNodes;
for (size_t i = 0; i < curNodes.size(); ) {
if (i > 0 && i + 1 == curNodes.size()) {
SkASSERT(curNodes[i]);
nextRoundNodes.emplace_back(std::move(curNodes[i]));
break;
}
auto newNode = sk_make_sp<SkPDFDict>("Pages");
auto kids = sk_make_sp<SkPDFArray>();
kids->reserve(kNodeSize);
int count = 0;
for (; i < curNodes.size() && count < kNodeSize; i++, count++) {
SkASSERT(curNodes[i]);
curNodes[i]->insertObjRef("Parent", newNode);
kids->appendObjRef(std::move(curNodes[i]));
}
// treeCapacity is the number of leaf nodes possible for the
// current set of subtrees being generated. (i.e. 8, 64, 512, ...).
// It is hard to count the number of leaf nodes in the current
// subtree. However, by construction, we know that unless it's the
// last subtree for the current depth, the leaf count will be
// treeCapacity, otherwise it's what ever is left over after
// consuming treeCapacity chunks.
size_t pageCount = treeCapacity;
if (i == curNodes.size()) {
pageCount = ((totalPageCount - 1) % treeCapacity) + 1;
}
newNode->insertInt("Count", SkToInt(pageCount));
newNode->insertObject("Kids", std::move(kids));
nextRoundNodes.emplace_back(std::move(newNode));
}
SkDEBUGCODE( for (const auto& n : curNodes) { SkASSERT(!n); } );
curNodes.swap(nextRoundNodes);
nextRoundNodes = std::vector<sk_sp<SkPDFDict>>();
treeCapacity *= kNodeSize;
} while (curNodes.size() > 1);
return std::move(curNodes[0]);
}
template<typename T, typename... Args>
static void reset_object(T* dst, Args&&... args) {
dst->~T();
new (dst) T(std::forward<Args>(args)...);
}
////////////////////////////////////////////////////////////////////////////////
SkPDFDocument::SkPDFDocument(SkWStream* stream,
const SkDocument::PDFMetadata& metadata)
: SkDocument(stream)
, fMetadata(metadata) {
constexpr float kDpiForRasterScaleOne = 72.0f;
if (fMetadata.fRasterDPI != kDpiForRasterScaleOne) {
fInverseRasterScale = kDpiForRasterScaleOne / fMetadata.fRasterDPI;
fRasterScale = fMetadata.fRasterDPI / kDpiForRasterScaleOne;
}
}
SkPDFDocument::~SkPDFDocument() {
// subclasses of SkDocument must call close() in their destructors.
this->close();
}
void SkPDFDocument::serialize(const sk_sp<SkPDFObject>& object) {
fObjectSerializer.addObjectRecursively(object);
fObjectSerializer.serializeObjects(this->getStream());
}
static SkSize operator*(SkISize u, SkScalar s) { return SkSize{u.width() * s, u.height() * s}; }
static SkSize operator*(SkSize u, SkScalar s) { return SkSize{u.width() * s, u.height() * s}; }
SkCanvas* SkPDFDocument::onBeginPage(SkScalar width, SkScalar height) {
SkASSERT(fCanvas.imageInfo().dimensions().isZero());
if (fPages.empty()) {
// if this is the first page if the document.
fObjectSerializer.serializeHeader(this->getStream(), fMetadata);
fDests = sk_make_sp<SkPDFDict>();
if (fMetadata.fPDFA) {
SkPDFMetadata::UUID uuid = SkPDFMetadata::CreateUUID(fMetadata);
// We use the same UUID for Document ID and Instance ID since this
// is the first revision of this document (and Skia does not
// support revising existing PDF documents).
// If we are not in PDF/A mode, don't use a UUID since testing
// works best with reproducible outputs.
fID = SkPDFMetadata::MakePdfId(uuid, uuid);
fXMP = SkPDFMetadata::MakeXMPObject(fMetadata, uuid, uuid);
fObjectSerializer.addObjectRecursively(fXMP);
fObjectSerializer.serializeObjects(this->getStream());
}
}
// By scaling the page at the device level, we will create bitmap layer
// devices at the rasterized scale, not the 72dpi scale. Bitmap layer
// devices are created when saveLayer is called with an ImageFilter; see
// SkPDFDevice::onCreateDevice().
SkISize pageSize = (SkSize{width, height} * fRasterScale).toRound();
SkMatrix initialTransform;
// Skia uses the top left as the origin but PDF natively has the origin at the
// bottom left. This matrix corrects for that, as well as the raster scale.
initialTransform.setScaleTranslate(fInverseRasterScale, -fInverseRasterScale,
0, fInverseRasterScale * pageSize.height());
fPageDevice = sk_make_sp<SkPDFDevice>(pageSize, this, initialTransform);
reset_object(&fCanvas, fPageDevice);
fCanvas.scale(fRasterScale, fRasterScale);
return &fCanvas;
}
void SkPDFDocument::onEndPage() {
SkASSERT(!fCanvas.imageInfo().dimensions().isZero());
fCanvas.flush();
reset_object(&fCanvas);
SkASSERT(fPageDevice);
auto page = sk_make_sp<SkPDFDict>("Page");
SkSize mediaSize = fPageDevice->imageInfo().dimensions() * fInverseRasterScale;
auto contentObject = sk_make_sp<SkPDFStream>(fPageDevice->content());
auto resourceDict = fPageDevice->makeResourceDict();
auto annotations = fPageDevice->getAnnotations();
fPageDevice->appendDestinations(fDests.get(), page.get());
fPageDevice = nullptr;
page->insertObject("Resources", resourceDict);
page->insertObject("MediaBox", SkPDFUtils::RectToArray(SkRect::MakeSize(mediaSize)));
if (annotations) {
page->insertObject("Annots", std::move(annotations));
}
this->serialize(contentObject);
page->insertObjRef("Contents", std::move(contentObject));
fPages.emplace_back(std::move(page));
}
void SkPDFDocument::onAbort() {
this->reset();
}
void SkPDFDocument::reset() {
fObjectSerializer = SkPDFObjectSerializer();
fCanon = SkPDFCanon();
reset_object(&fCanvas);
fPages = std::vector<sk_sp<SkPDFDict>>();
fFonts.reset();
fDests = nullptr;
fPageDevice = nullptr;
fID = nullptr;
fXMP = nullptr;
fMetadata = SkDocument::PDFMetadata();
fRasterScale = 1;
fInverseRasterScale = 1;
}
static sk_sp<SkData> SkSrgbIcm() {
// Source: http://www.argyllcms.com/icclibsrc.html
static const char kProfile[] =
"\0\0\14\214argl\2 \0\0mntrRGB XYZ \7\336\0\1\0\6\0\26\0\17\0:acspM"
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"\204\276\377\277z\277\365\300p\300\354\301g\301\343\302_\302\333\303"
"X\303\324\304Q\304\316\305K\305\310\306F\306\303\307A\307\277\310="
"\310\274\311:\311\271\3128\312\267\3136\313\266\3145\314\265\3155\315"
"\265\3166\316\266\3177\317\270\3209\320\272\321<\321\276\322?\322\301"
"\323D\323\306\324I\324\313\325N\325\321\326U\326\330\327\\\327\340"
"\330d\330\350\331l\331\361\332v\332\373\333\200\334\5\334\212\335\20"
"\335\226\336\34\336\242\337)\337\257\3406\340\275\341D\341\314\342"
"S\342\333\343c\343\353\344s\344\374\345\204\346\r\346\226\347\37\347"
"\251\3502\350\274\351F\351\320\352[\352\345\353p\353\373\354\206\355"
"\21\355\234\356(\356\264\357@\357\314\360X\360\345\361r\361\377\362"
"\214\363\31\363\247\3644\364\302\365P\365\336\366m\366\373\367\212"
"\370\31\370\250\3718\371\307\372W\372\347\373w\374\7\374\230\375)\375"
"\272\376K\376\334\377m\377\377";
const size_t kProfileLength = 3212;
static_assert(kProfileLength == sizeof(kProfile) - 1, "");
return SkData::MakeWithoutCopy(kProfile, kProfileLength);
}
static sk_sp<SkPDFStream> make_srgb_color_profile() {
sk_sp<SkPDFStream> stream = sk_make_sp<SkPDFStream>(SkSrgbIcm());
stream->dict()->insertInt("N", 3);
sk_sp<SkPDFArray> array = sk_make_sp<SkPDFArray>();
array->appendScalar(0.0f);
array->appendScalar(1.0f);
array->appendScalar(0.0f);
array->appendScalar(1.0f);
array->appendScalar(0.0f);
array->appendScalar(1.0f);
stream->dict()->insertObject("Range", std::move(array));
return stream;
}
static sk_sp<SkPDFArray> make_srgb_output_intents() {
// sRGB is specified by HTML, CSS, and SVG.
auto outputIntent = sk_make_sp<SkPDFDict>("OutputIntent");
outputIntent->insertName("S", "GTS_PDFA1");
outputIntent->insertString("RegistryName", "http://www.color.org");
outputIntent->insertString("OutputConditionIdentifier",
"Custom");
outputIntent->insertString("Info","sRGB IEC61966-2.1");
outputIntent->insertObjRef("DestOutputProfile",
make_srgb_color_profile());
auto intentArray = sk_make_sp<SkPDFArray>();
intentArray->appendObject(std::move(outputIntent));
return intentArray;
}
void SkPDFDocument::onClose(SkWStream* stream) {
SkASSERT(fCanvas.imageInfo().dimensions().isZero());
if (fPages.empty()) {
this->reset();
return;
}
auto docCatalog = sk_make_sp<SkPDFDict>("Catalog");
if (fMetadata.fPDFA) {
SkASSERT(fXMP);
docCatalog->insertObjRef("Metadata", fXMP);
// Don't specify OutputIntents if we are not in PDF/A mode since
// no one has ever asked for this feature.
docCatalog->insertObject("OutputIntents", make_srgb_output_intents());
}
SkASSERT(!fPages.empty());
docCatalog->insertObjRef("Pages", generate_page_tree(&fPages));
SkASSERT(fPages.empty());
if (fDests->size() > 0) {
docCatalog->insertObjRef("Dests", std::move(fDests));
}
// Build font subsetting info before calling addObjectRecursively().
SkPDFCanon* canon = &fCanon;
fFonts.foreach([canon](SkPDFFont* p){ p->getFontSubset(canon); });
fObjectSerializer.addObjectRecursively(docCatalog);
fObjectSerializer.serializeObjects(this->getStream());
fObjectSerializer.serializeFooter(this->getStream(), docCatalog, fID);
this->reset();
}
///////////////////////////////////////////////////////////////////////////////
sk_sp<SkDocument> SkPDFMakeDocument(SkWStream* stream,
const SkDocument::PDFMetadata& metadata) {
SkDocument::PDFMetadata meta = metadata;
if (meta.fRasterDPI <= 0) {
meta.fRasterDPI = 72.0f;
}
if (meta.fEncodingQuality < 0) {
meta.fEncodingQuality = 0;
}
return stream ? sk_make_sp<SkPDFDocument>(stream, meta) : nullptr;
}
sk_sp<SkDocument> SkDocument::MakePDF(SkWStream* stream, const PDFMetadata& metadata) {
return SkPDFMakeDocument(stream, metadata);
}
sk_sp<SkDocument> SkDocument::MakePDF(SkWStream* stream) {
return SkPDFMakeDocument(stream, PDFMetadata());
}