blob: 60a7e18770379d64cb3c48462800881db854c977 [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 "include/docs/SkPDFDocument.h"
#include "src/pdf/SkPDFDocumentPriv.h"
#include "include/core/SkStream.h"
#include "include/docs/SkPDFDocument.h"
#include "include/private/SkTo.h"
#include "src/pdf/SkPDFDevice.h"
#include "src/pdf/SkPDFFont.h"
#include "src/pdf/SkPDFGradientShader.h"
#include "src/pdf/SkPDFGraphicState.h"
#include "src/pdf/SkPDFShader.h"
#include "src/pdf/SkPDFTag.h"
#include "src/pdf/SkPDFUtils.h"
#include "src/utils/SkUTF.h"
#include <utility>
// For use in SkCanvas::drawAnnotation
const char* SkPDFGetNodeIdKey() {
static constexpr char key[] = "PDF_Node_Key";
return key;
}
static SkString ToValidUtf8String(const SkData& d) {
if (d.size() == 0) {
SkDEBUGFAIL("Not a valid string, data length is zero.");
return SkString();
}
const char* c_str = static_cast<const char*>(d.data());
if (c_str[d.size() - 1] != 0) {
SkDEBUGFAIL("Not a valid string, not null-terminated.");
return SkString();
}
// CountUTF8 returns -1 if there's an invalid UTF-8 byte sequence.
int valid_utf8_chars_count = SkUTF::CountUTF8(c_str, d.size() - 1);
if (valid_utf8_chars_count == -1) {
SkDEBUGFAIL("Not a valid UTF-8 string.");
return SkString();
}
return SkString(c_str, d.size() - 1);
}
////////////////////////////////////////////////////////////////////////////////
void SkPDFOffsetMap::markStartOfDocument(const SkWStream* s) { fBaseOffset = s->bytesWritten(); }
static size_t difference(size_t minuend, size_t subtrahend) {
return SkASSERT(minuend >= subtrahend), minuend - subtrahend;
}
void SkPDFOffsetMap::markStartOfObject(int referenceNumber, const SkWStream* s) {
SkASSERT(referenceNumber > 0);
size_t index = SkToSizeT(referenceNumber - 1);
if (index >= fOffsets.size()) {
fOffsets.resize(index + 1);
}
fOffsets[index] = SkToInt(difference(s->bytesWritten(), fBaseOffset));
}
int SkPDFOffsetMap::objectCount() const {
return SkToInt(fOffsets.size() + 1); // Include the special zeroth object in the count.
}
int SkPDFOffsetMap::emitCrossReferenceTable(SkWStream* s) const {
int xRefFileOffset = SkToInt(difference(s->bytesWritten(), fBaseOffset));
s->writeText("xref\n0 ");
s->writeDecAsText(this->objectCount());
s->writeText("\n0000000000 65535 f \n");
for (int offset : fOffsets) {
SkASSERT(offset > 0); // Offset was set.
s->writeBigDecAsText(offset, 10);
s->writeText(" 00000 n \n");
}
return xRefFileOffset;
}
//
////////////////////////////////////////////////////////////////////////////////
#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
static void serializeHeader(SkPDFOffsetMap* offsetMap, SkWStream* wStream) {
offsetMap->markStartOfDocument(wStream);
wStream->writeText("%PDF-1.4\n%" SKPDF_MAGIC "\n");
// 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.
}
#undef SKPDF_MAGIC
static void begin_indirect_object(SkPDFOffsetMap* offsetMap,
SkPDFIndirectReference ref,
SkWStream* s) {
offsetMap->markStartOfObject(ref.fValue, s);
s->writeDecAsText(ref.fValue);
s->writeText(" 0 obj\n"); // Generation number is always 0.
}
static void end_indirect_object(SkWStream* s) { s->writeText("\nendobj\n"); }
// Xref table and footer
static void serialize_footer(const SkPDFOffsetMap& offsetMap,
SkWStream* wStream,
SkPDFIndirectReference infoDict,
SkPDFIndirectReference docCatalog,
SkUUID uuid) {
int xRefFileOffset = offsetMap.emitCrossReferenceTable(wStream);
SkPDFDict trailerDict;
trailerDict.insertInt("Size", offsetMap.objectCount());
SkASSERT(docCatalog != SkPDFIndirectReference());
trailerDict.insertRef("Root", docCatalog);
SkASSERT(infoDict != SkPDFIndirectReference());
trailerDict.insertRef("Info", infoDict);
if (SkUUID() != uuid) {
trailerDict.insertObject("ID", SkPDFMetadata::MakePdfId(uuid, uuid));
}
wStream->writeText("trailer\n");
trailerDict.emitObject(wStream);
wStream->writeText("\nstartxref\n");
wStream->writeBigDecAsText(xRefFileOffset);
wStream->writeText("\n%%EOF");
}
static SkPDFIndirectReference generate_page_tree(
SkPDFDocument* doc,
std::vector<std::unique_ptr<SkPDFDict>> pages,
const std::vector<SkPDFIndirectReference>& pageRefs) {
// 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.
SkASSERT(pages.size() > 0);
struct PageTreeNode {
std::unique_ptr<SkPDFDict> fNode;
SkPDFIndirectReference fReservedRef;
int fPageObjectDescendantCount;
static std::vector<PageTreeNode> Layer(std::vector<PageTreeNode> vec, SkPDFDocument* doc) {
std::vector<PageTreeNode> result;
static constexpr size_t kMaxNodeSize = 8;
const size_t n = vec.size();
SkASSERT(n >= 1);
const size_t result_len = (n - 1) / kMaxNodeSize + 1;
SkASSERT(result_len >= 1);
SkASSERT(n == 1 || result_len < n);
result.reserve(result_len);
size_t index = 0;
for (size_t i = 0; i < result_len; ++i) {
if (n != 1 && index + 1 == n) { // No need to create a new node.
result.push_back(std::move(vec[index++]));
continue;
}
SkPDFIndirectReference parent = doc->reserveRef();
auto kids_list = SkPDFMakeArray();
int descendantCount = 0;
for (size_t j = 0; j < kMaxNodeSize && index < n; ++j) {
PageTreeNode& node = vec[index++];
node.fNode->insertRef("Parent", parent);
kids_list->appendRef(doc->emit(*node.fNode, node.fReservedRef));
descendantCount += node.fPageObjectDescendantCount;
}
auto next = SkPDFMakeDict("Pages");
next->insertInt("Count", descendantCount);
next->insertObject("Kids", std::move(kids_list));
result.push_back(PageTreeNode{std::move(next), parent, descendantCount});
}
return result;
}
};
std::vector<PageTreeNode> currentLayer;
currentLayer.reserve(pages.size());
SkASSERT(pages.size() == pageRefs.size());
for (size_t i = 0; i < pages.size(); ++i) {
currentLayer.push_back(PageTreeNode{std::move(pages[i]), pageRefs[i], 1});
}
currentLayer = PageTreeNode::Layer(std::move(currentLayer), doc);
while (currentLayer.size() > 1) {
currentLayer = PageTreeNode::Layer(std::move(currentLayer), doc);
}
SkASSERT(currentLayer.size() == 1);
const PageTreeNode& root = currentLayer[0];
return doc->emit(*root.fNode, root.fReservedRef);
}
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,
SkPDF::Metadata metadata)
: SkDocument(stream)
, fMetadata(std::move(metadata)) {
constexpr float kDpiForRasterScaleOne = 72.0f;
if (fMetadata.fRasterDPI != kDpiForRasterScaleOne) {
fInverseRasterScale = kDpiForRasterScaleOne / fMetadata.fRasterDPI;
fRasterScale = fMetadata.fRasterDPI / kDpiForRasterScaleOne;
}
if (fMetadata.fStructureElementTreeRoot) {
fTagTree.init(fMetadata.fStructureElementTreeRoot);
}
fExecutor = fMetadata.fExecutor;
}
SkPDFDocument::~SkPDFDocument() {
// subclasses of SkDocument must call close() in their destructors.
this->close();
}
SkPDFIndirectReference SkPDFDocument::emit(const SkPDFObject& object, SkPDFIndirectReference ref){
SkAutoMutexExclusive lock(fMutex);
object.emitObject(this->beginObject(ref));
this->endObject();
return ref;
}
SkWStream* SkPDFDocument::beginObject(SkPDFIndirectReference ref) SK_REQUIRES(fMutex) {
begin_indirect_object(&fOffsetMap, ref, this->getStream());
return this->getStream();
}
void SkPDFDocument::endObject() SK_REQUIRES(fMutex) {
end_indirect_object(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.
{
SkAutoMutexExclusive autoMutexAcquire(fMutex);
serializeHeader(&fOffsetMap, this->getStream());
}
fInfoDict = this->emit(*SkPDFMetadata::MakeDocumentInformationDict(fMetadata));
if (fMetadata.fPDFA) {
fUUID = 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.
fXMP = SkPDFMetadata::MakeXMPObject(fMetadata, fUUID, fUUID, this);
}
}
// 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);
fPageRefs.push_back(this->reserveRef());
return &fCanvas;
}
static void populate_link_annotation(SkPDFDict* annotation, const SkRect& r) {
annotation->insertName("Subtype", "Link");
annotation->insertInt("F", 4); // required by ISO 19005
// Border: 0 = Horizontal corner radius.
// 0 = Vertical corner radius.
// 0 = Width, 0 = no border.
annotation->insertObject("Border", SkPDFMakeArray(0, 0, 0));
annotation->insertObject("Rect", SkPDFMakeArray(r.fLeft, r.fTop, r.fRight, r.fBottom));
}
static SkPDFIndirectReference append_destinations(
SkPDFDocument* doc,
const std::vector<SkPDFNamedDestination>& namedDestinations)
{
SkPDFDict destinations;
for (const SkPDFNamedDestination& dest : namedDestinations) {
auto pdfDest = SkPDFMakeArray();
pdfDest->reserve(5);
pdfDest->appendRef(dest.fPage);
pdfDest->appendName("XYZ");
pdfDest->appendScalar(dest.fPoint.x());
pdfDest->appendScalar(dest.fPoint.y());
pdfDest->appendInt(0); // Leave zoom unchanged
destinations.insertObject(ToValidUtf8String(*dest.fName), std::move(pdfDest));
}
return doc->emit(destinations);
}
std::unique_ptr<SkPDFArray> SkPDFDocument::getAnnotations() {
std::unique_ptr<SkPDFArray> array;
size_t count = fCurrentPageLinks.size();
if (0 == count) {
return array; // is nullptr
}
array = SkPDFMakeArray();
array->reserve(count);
for (const auto& link : fCurrentPageLinks) {
SkPDFDict annotation("Annot");
populate_link_annotation(&annotation, link->fRect);
if (link->fType == SkPDFLink::Type::kUrl) {
std::unique_ptr<SkPDFDict> action = SkPDFMakeDict("Action");
action->insertName("S", "URI");
// This is documented to be a 7 bit ASCII (byte) string.
action->insertByteString("URI", ToValidUtf8String(*link->fData));
annotation.insertObject("A", std::move(action));
} else if (link->fType == SkPDFLink::Type::kNamedDestination) {
annotation.insertName("Dest", ToValidUtf8String(*link->fData));
} else {
SkDEBUGFAIL("Unknown link type.");
}
if (link->fNodeId) {
int structParentKey = createStructParentKeyForNodeId(link->fNodeId);
if (structParentKey != -1) {
annotation.insertInt("StructParent", structParentKey);
}
}
SkPDFIndirectReference annotationRef = emit(annotation);
array->appendRef(annotationRef);
if (link->fNodeId) {
fTagTree.addNodeAnnotation(link->fNodeId, annotationRef, SkToUInt(this->currentPageIndex()));
}
}
return array;
}
void SkPDFDocument::onEndPage() {
SkASSERT(!fCanvas.imageInfo().dimensions().isZero());
reset_object(&fCanvas);
SkASSERT(fPageDevice);
auto page = SkPDFMakeDict("Page");
SkSize mediaSize = fPageDevice->imageInfo().dimensions() * fInverseRasterScale;
std::unique_ptr<SkStreamAsset> pageContent = fPageDevice->content();
auto resourceDict = fPageDevice->makeResourceDict();
SkASSERT(fPageRefs.size() > 0);
fPageDevice = nullptr;
page->insertObject("Resources", std::move(resourceDict));
page->insertObject("MediaBox", SkPDFUtils::RectToArray(SkRect::MakeSize(mediaSize)));
if (std::unique_ptr<SkPDFArray> annotations = getAnnotations()) {
page->insertObject("Annots", std::move(annotations));
fCurrentPageLinks.clear();
}
page->insertRef("Contents", SkPDFStreamOut(nullptr, std::move(pageContent), this));
// The StructParents unique identifier for each page is just its
// 0-based page index.
page->insertInt("StructParents", SkToInt(this->currentPageIndex()));
fPages.emplace_back(std::move(page));
}
void SkPDFDocument::onAbort() {
this->waitForJobs();
}
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"
"SFT\0\0\0\0IEC sRGB\0\0\0\0\0\0\0\0\0\0\0\0\0\0\366\326\0\1\0\0\0\0"
"\323-argl\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\21desc\0\0\1P\0\0\0\231cprt\0"
"\0\1\354\0\0\0gdmnd\0\0\2T\0\0\0pdmdd\0\0\2\304\0\0\0\210tech\0\0\3"
"L\0\0\0\14vued\0\0\3X\0\0\0gview\0\0\3\300\0\0\0$lumi\0\0\3\344\0\0"
"\0\24meas\0\0\3\370\0\0\0$wtpt\0\0\4\34\0\0\0\24bkpt\0\0\0040\0\0\0"
"\24rXYZ\0\0\4D\0\0\0\24gXYZ\0\0\4X\0\0\0\24bXYZ\0\0\4l\0\0\0\24rTR"
"C\0\0\4\200\0\0\10\14gTRC\0\0\4\200\0\0\10\14bTRC\0\0\4\200\0\0\10"
"\14desc\0\0\0\0\0\0\0?sRGB IEC61966-2.1 (Equivalent to www.srgb.co"
"m 1998 HP profile)\0\0\0\0\0\0\0\0\0\0\0?sRGB IEC61966-2.1 (Equiva"
"lent to www.srgb.com 1998 HP profile)\0\0\0\0\0\0\0\0text\0\0\0\0C"
"reated by Graeme W. Gill. Released into the public domain. No Warr"
"anty, Use at your own risk.\0\0desc\0\0\0\0\0\0\0\26IEC http://www"
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"\0\0\0\0\0\0desc\0\0\0\0\0\0\0.IEC 61966-2.1 Default RGB colour sp"
"ace - sRGB\0\0\0\0\0\0\0\0\0\0\0.IEC 61966-2.1 Default RGB colour "
"space - sRGB\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0sig \0\0\0"
"\0CRT desc\0\0\0\0\0\0\0\rIEC61966-2.1\0\0\0\0\0\0\0\0\0\0\0\rIEC6"
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const size_t kProfileLength = 3212;
static_assert(kProfileLength == sizeof(kProfile) - 1, "");
return SkData::MakeWithoutCopy(kProfile, kProfileLength);
}
static SkPDFIndirectReference make_srgb_color_profile(SkPDFDocument* doc) {
std::unique_ptr<SkPDFDict> dict = SkPDFMakeDict();
dict->insertInt("N", 3);
dict->insertObject("Range", SkPDFMakeArray(0, 1, 0, 1, 0, 1));
return SkPDFStreamOut(std::move(dict), SkMemoryStream::Make(SkSrgbIcm()),
doc, SkPDFSteamCompressionEnabled::Yes);
}
static std::unique_ptr<SkPDFArray> make_srgb_output_intents(SkPDFDocument* doc) {
// sRGB is specified by HTML, CSS, and SVG.
auto outputIntent = SkPDFMakeDict("OutputIntent");
outputIntent->insertName("S", "GTS_PDFA1");
outputIntent->insertTextString("RegistryName", "http://www.color.org");
outputIntent->insertTextString("OutputConditionIdentifier", "Custom");
outputIntent->insertTextString("Info", "sRGB IEC61966-2.1");
outputIntent->insertRef("DestOutputProfile", make_srgb_color_profile(doc));
auto intentArray = SkPDFMakeArray();
intentArray->appendObject(std::move(outputIntent));
return intentArray;
}
SkPDFIndirectReference SkPDFDocument::getPage(size_t pageIndex) const {
SkASSERT(pageIndex < fPageRefs.size());
return fPageRefs[pageIndex];
}
const SkMatrix& SkPDFDocument::currentPageTransform() const {
return fPageDevice->initialTransform();
}
int SkPDFDocument::createMarkIdForNodeId(int nodeId) {
return fTagTree.createMarkIdForNodeId(nodeId, SkToUInt(this->currentPageIndex()));
}
int SkPDFDocument::createStructParentKeyForNodeId(int nodeId) {
return fTagTree.createStructParentKeyForNodeId(nodeId, SkToUInt(this->currentPageIndex()));
}
static std::vector<const SkPDFFont*> get_fonts(const SkPDFDocument& canon) {
std::vector<const SkPDFFont*> fonts;
fonts.reserve(canon.fFontMap.count());
// Sort so the output PDF is reproducible.
for (const auto& [unused, font] : canon.fFontMap) {
fonts.push_back(&font);
}
std::sort(fonts.begin(), fonts.end(), [](const SkPDFFont* u, const SkPDFFont* v) {
return u->indirectReference().fValue < v->indirectReference().fValue;
});
return fonts;
}
SkString SkPDFDocument::nextFontSubsetTag() {
// PDF 32000-1:2008 Section 9.6.4 FontSubsets "The tag shall consist of six uppercase letters"
// "followed by a plus sign" "different subsets in the same PDF file shall have different tags."
// There are 26^6 or 308,915,776 possible values. So start in range then increment and mod.
uint32_t thisFontSubsetTag = fNextFontSubsetTag;
fNextFontSubsetTag = (fNextFontSubsetTag + 1u) % 308915776u;
SkString subsetTag(7);
char* subsetTagData = subsetTag.data();
for (size_t i = 0; i < 6; ++i) {
subsetTagData[i] = 'A' + (thisFontSubsetTag % 26);
thisFontSubsetTag /= 26;
}
subsetTagData[6] = '+';
return subsetTag;
}
void SkPDFDocument::onClose(SkWStream* stream) {
SkASSERT(fCanvas.imageInfo().dimensions().isZero());
if (fPages.empty()) {
this->waitForJobs();
return;
}
auto docCatalog = SkPDFMakeDict("Catalog");
if (fMetadata.fPDFA) {
SkASSERT(fXMP != SkPDFIndirectReference());
docCatalog->insertRef("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(this));
}
docCatalog->insertRef("Pages", generate_page_tree(this, std::move(fPages), fPageRefs));
if (!fNamedDestinations.empty()) {
docCatalog->insertRef("Dests", append_destinations(this, fNamedDestinations));
fNamedDestinations.clear();
}
// Handle tagged PDFs.
if (SkPDFIndirectReference root = fTagTree.makeStructTreeRoot(this)) {
// In the document catalog, indicate that this PDF is tagged.
auto markInfo = SkPDFMakeDict("MarkInfo");
markInfo->insertBool("Marked", true);
docCatalog->insertObject("MarkInfo", std::move(markInfo));
docCatalog->insertRef("StructTreeRoot", root);
}
auto docCatalogRef = this->emit(*docCatalog);
for (const SkPDFFont* f : get_fonts(*this)) {
f->emitSubset(this);
}
this->waitForJobs();
{
SkAutoMutexExclusive autoMutexAcquire(fMutex);
serialize_footer(fOffsetMap, this->getStream(), fInfoDict, docCatalogRef, fUUID);
}
}
void SkPDFDocument::incrementJobCount() { fJobCount++; }
void SkPDFDocument::signalJobComplete() { fSemaphore.signal(); }
void SkPDFDocument::waitForJobs() {
// fJobCount can increase while we wait.
while (fJobCount > 0) {
fSemaphore.wait();
--fJobCount;
}
}
///////////////////////////////////////////////////////////////////////////////
void SkPDF::SetNodeId(SkCanvas* canvas, int nodeID) {
sk_sp<SkData> payload = SkData::MakeWithCopy(&nodeID, sizeof(nodeID));
const char* key = SkPDFGetNodeIdKey();
canvas->drawAnnotation({0, 0, 0, 0}, key, payload.get());
}
sk_sp<SkDocument> SkPDF::MakeDocument(SkWStream* stream, const SkPDF::Metadata& metadata) {
SkPDF::Metadata meta = metadata;
if (meta.fRasterDPI <= 0) {
meta.fRasterDPI = 72.0f;
}
if (meta.fEncodingQuality < 0) {
meta.fEncodingQuality = 0;
}
return stream ? sk_make_sp<SkPDFDocument>(stream, std::move(meta)) : nullptr;
}