1 /*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "SkPDFDocument.h"
9
10 #include "SkCanvas.h"
11 #include "SkMakeUnique.h"
12 #include "SkPDFCanon.h"
13 #include "SkPDFDevice.h"
14 #include "SkPDFUtils.h"
15 #include "SkStream.h"
16
SkPDFObjectSerializer()17 SkPDFObjectSerializer::SkPDFObjectSerializer() : fBaseOffset(0), fNextToBeSerialized(0) {}
18
renew(T * t)19 template <class T> static void renew(T* t) { t->~T(); new (t) T; }
20
~SkPDFObjectSerializer()21 SkPDFObjectSerializer::~SkPDFObjectSerializer() {
22 for (int i = 0; i < fObjNumMap.objects().count(); ++i) {
23 fObjNumMap.objects()[i]->drop();
24 }
25 }
26
addObjectRecursively(const sk_sp<SkPDFObject> & object)27 void SkPDFObjectSerializer::addObjectRecursively(const sk_sp<SkPDFObject>& object) {
28 fObjNumMap.addObjectRecursively(object.get());
29 }
30
31 #define SKPDF_MAGIC "\xD3\xEB\xE9\xE1"
32 #ifndef SK_BUILD_FOR_WIN32
33 static_assert((SKPDF_MAGIC[0] & 0x7F) == "Skia"[0], "");
34 static_assert((SKPDF_MAGIC[1] & 0x7F) == "Skia"[1], "");
35 static_assert((SKPDF_MAGIC[2] & 0x7F) == "Skia"[2], "");
36 static_assert((SKPDF_MAGIC[3] & 0x7F) == "Skia"[3], "");
37 #endif
serializeHeader(SkWStream * wStream,const SkDocument::PDFMetadata & md)38 void SkPDFObjectSerializer::serializeHeader(SkWStream* wStream,
39 const SkDocument::PDFMetadata& md) {
40 fBaseOffset = wStream->bytesWritten();
41 static const char kHeader[] = "%PDF-1.4\n%" SKPDF_MAGIC "\n";
42 wStream->write(kHeader, strlen(kHeader));
43 // The PDF spec recommends including a comment with four
44 // bytes, all with their high bits set. "\xD3\xEB\xE9\xE1" is
45 // "Skia" with the high bits set.
46 fInfoDict = SkPDFMetadata::MakeDocumentInformationDict(md);
47 this->addObjectRecursively(fInfoDict);
48 this->serializeObjects(wStream);
49 }
50 #undef SKPDF_MAGIC
51
52 // Serialize all objects in the fObjNumMap that have not yet been serialized;
serializeObjects(SkWStream * wStream)53 void SkPDFObjectSerializer::serializeObjects(SkWStream* wStream) {
54 const SkTArray<sk_sp<SkPDFObject>>& objects = fObjNumMap.objects();
55 while (fNextToBeSerialized < objects.count()) {
56 SkPDFObject* object = objects[fNextToBeSerialized].get();
57 int32_t index = fNextToBeSerialized + 1; // Skip object 0.
58 // "The first entry in the [XREF] table (object number 0) is
59 // always free and has a generation number of 65,535; it is
60 // the head of the linked list of free objects."
61 SkASSERT(fOffsets.count() == fNextToBeSerialized);
62 fOffsets.push(this->offset(wStream));
63 wStream->writeDecAsText(index);
64 wStream->writeText(" 0 obj\n"); // Generation number is always 0.
65 object->emitObject(wStream, fObjNumMap);
66 wStream->writeText("\nendobj\n");
67 object->drop();
68 ++fNextToBeSerialized;
69 }
70 }
71
72 // Xref table and footer
serializeFooter(SkWStream * wStream,const sk_sp<SkPDFObject> docCatalog,sk_sp<SkPDFObject> id)73 void SkPDFObjectSerializer::serializeFooter(SkWStream* wStream,
74 const sk_sp<SkPDFObject> docCatalog,
75 sk_sp<SkPDFObject> id) {
76 this->serializeObjects(wStream);
77 int32_t xRefFileOffset = this->offset(wStream);
78 // Include the special zeroth object in the count.
79 int32_t objCount = SkToS32(fOffsets.count() + 1);
80 wStream->writeText("xref\n0 ");
81 wStream->writeDecAsText(objCount);
82 wStream->writeText("\n0000000000 65535 f \n");
83 for (int i = 0; i < fOffsets.count(); i++) {
84 wStream->writeBigDecAsText(fOffsets[i], 10);
85 wStream->writeText(" 00000 n \n");
86 }
87 SkPDFDict trailerDict;
88 trailerDict.insertInt("Size", objCount);
89 SkASSERT(docCatalog);
90 trailerDict.insertObjRef("Root", docCatalog);
91 SkASSERT(fInfoDict);
92 trailerDict.insertObjRef("Info", std::move(fInfoDict));
93 if (id) {
94 trailerDict.insertObject("ID", std::move(id));
95 }
96 wStream->writeText("trailer\n");
97 trailerDict.emitObject(wStream, fObjNumMap);
98 wStream->writeText("\nstartxref\n");
99 wStream->writeBigDecAsText(xRefFileOffset);
100 wStream->writeText("\n%%EOF");
101 }
102
offset(SkWStream * wStream)103 int32_t SkPDFObjectSerializer::offset(SkWStream* wStream) {
104 size_t offset = wStream->bytesWritten();
105 SkASSERT(offset > fBaseOffset);
106 return SkToS32(offset - fBaseOffset);
107 }
108
109
110 // return root node.
generate_page_tree(SkTArray<sk_sp<SkPDFDict>> * pages)111 static sk_sp<SkPDFDict> generate_page_tree(SkTArray<sk_sp<SkPDFDict>>* pages) {
112 // PDF wants a tree describing all the pages in the document. We arbitrary
113 // choose 8 (kNodeSize) as the number of allowed children. The internal
114 // nodes have type "Pages" with an array of children, a parent pointer, and
115 // the number of leaves below the node as "Count." The leaves are passed
116 // into the method, have type "Page" and need a parent pointer. This method
117 // builds the tree bottom up, skipping internal nodes that would have only
118 // one child.
119 static const int kNodeSize = 8;
120
121 // curNodes takes a reference to its items, which it passes to pageTree.
122 int totalPageCount = pages->count();
123 SkTArray<sk_sp<SkPDFDict>> curNodes;
124 curNodes.swap(pages);
125
126 // nextRoundNodes passes its references to nodes on to curNodes.
127 int treeCapacity = kNodeSize;
128 do {
129 SkTArray<sk_sp<SkPDFDict>> nextRoundNodes;
130 for (int i = 0; i < curNodes.count(); ) {
131 if (i > 0 && i + 1 == curNodes.count()) {
132 SkASSERT(curNodes[i]);
133 nextRoundNodes.emplace_back(std::move(curNodes[i]));
134 break;
135 }
136
137 auto newNode = sk_make_sp<SkPDFDict>("Pages");
138 auto kids = sk_make_sp<SkPDFArray>();
139 kids->reserve(kNodeSize);
140
141 int count = 0;
142 for (; i < curNodes.count() && count < kNodeSize; i++, count++) {
143 SkASSERT(curNodes[i]);
144 curNodes[i]->insertObjRef("Parent", newNode);
145 kids->appendObjRef(std::move(curNodes[i]));
146 }
147
148 // treeCapacity is the number of leaf nodes possible for the
149 // current set of subtrees being generated. (i.e. 8, 64, 512, ...).
150 // It is hard to count the number of leaf nodes in the current
151 // subtree. However, by construction, we know that unless it's the
152 // last subtree for the current depth, the leaf count will be
153 // treeCapacity, otherwise it's what ever is left over after
154 // consuming treeCapacity chunks.
155 int pageCount = treeCapacity;
156 if (i == curNodes.count()) {
157 pageCount = ((totalPageCount - 1) % treeCapacity) + 1;
158 }
159 newNode->insertInt("Count", pageCount);
160 newNode->insertObject("Kids", std::move(kids));
161 nextRoundNodes.emplace_back(std::move(newNode));
162 }
163 SkDEBUGCODE( for (const auto& n : curNodes) { SkASSERT(!n); } );
164
165 curNodes.swap(&nextRoundNodes);
166 nextRoundNodes.reset();
167 treeCapacity *= kNodeSize;
168 } while (curNodes.count() > 1);
169 return std::move(curNodes[0]);
170 }
171
172 ////////////////////////////////////////////////////////////////////////////////
173
SkPDFDocument(SkWStream * stream,void (* doneProc)(SkWStream *,bool),SkScalar rasterDpi,const SkDocument::PDFMetadata & metadata,sk_sp<SkPixelSerializer> jpegEncoder,bool pdfa)174 SkPDFDocument::SkPDFDocument(SkWStream* stream,
175 void (*doneProc)(SkWStream*, bool),
176 SkScalar rasterDpi,
177 const SkDocument::PDFMetadata& metadata,
178 sk_sp<SkPixelSerializer> jpegEncoder,
179 bool pdfa)
180 : SkDocument(stream, doneProc)
181 , fRasterDpi(rasterDpi)
182 , fMetadata(metadata)
183 , fPDFA(pdfa) {
184 fCanon.fPixelSerializer = std::move(jpegEncoder);
185 }
186
~SkPDFDocument()187 SkPDFDocument::~SkPDFDocument() {
188 // subclasses of SkDocument must call close() in their destructors.
189 this->close();
190 }
191
serialize(const sk_sp<SkPDFObject> & object)192 void SkPDFDocument::serialize(const sk_sp<SkPDFObject>& object) {
193 fObjectSerializer.addObjectRecursively(object);
194 fObjectSerializer.serializeObjects(this->getStream());
195 }
196
onBeginPage(SkScalar width,SkScalar height)197 SkCanvas* SkPDFDocument::onBeginPage(SkScalar width, SkScalar height) {
198 SkASSERT(!fCanvas.get()); // endPage() was called before this.
199 if (fPages.empty()) {
200 // if this is the first page if the document.
201 fObjectSerializer.serializeHeader(this->getStream(), fMetadata);
202 fDests = sk_make_sp<SkPDFDict>();
203 if (fPDFA) {
204 SkPDFMetadata::UUID uuid = SkPDFMetadata::CreateUUID(fMetadata);
205 // We use the same UUID for Document ID and Instance ID since this
206 // is the first revision of this document (and Skia does not
207 // support revising existing PDF documents).
208 // If we are not in PDF/A mode, don't use a UUID since testing
209 // works best with reproducible outputs.
210 fID = SkPDFMetadata::MakePdfId(uuid, uuid);
211 fXMP = SkPDFMetadata::MakeXMPObject(fMetadata, uuid, uuid);
212 fObjectSerializer.addObjectRecursively(fXMP);
213 fObjectSerializer.serializeObjects(this->getStream());
214 }
215 }
216 SkISize pageSize = SkISize::Make(
217 SkScalarRoundToInt(width), SkScalarRoundToInt(height));
218 fPageDevice = sk_make_sp<SkPDFDevice>(pageSize, this);
219 fPageDevice->setFlip(); // Only the top-level device needs to be flipped.
220 fCanvas.reset(new SkCanvas(fPageDevice.get()));
221 return fCanvas.get();
222 }
223
onEndPage()224 void SkPDFDocument::onEndPage() {
225 SkASSERT(fCanvas.get());
226 fCanvas->flush();
227 fCanvas.reset(nullptr);
228 SkASSERT(fPageDevice);
229 auto page = sk_make_sp<SkPDFDict>("Page");
230 page->insertObject("Resources", fPageDevice->makeResourceDict());
231 page->insertObject("MediaBox", fPageDevice->copyMediaBox());
232 auto annotations = sk_make_sp<SkPDFArray>();
233 fPageDevice->appendAnnotations(annotations.get());
234 if (annotations->size() > 0) {
235 page->insertObject("Annots", std::move(annotations));
236 }
237 auto contentObject = sk_make_sp<SkPDFStream>(fPageDevice->content());
238 this->serialize(contentObject);
239 page->insertObjRef("Contents", std::move(contentObject));
240 fPageDevice->appendDestinations(fDests.get(), page.get());
241 fPages.emplace_back(std::move(page));
242 fPageDevice.reset(nullptr);
243 }
244
onAbort()245 void SkPDFDocument::onAbort() {
246 this->reset();
247 }
248
reset()249 void SkPDFDocument::reset() {
250 fCanvas.reset(nullptr);
251 fPages.reset();
252 renew(&fCanon);
253 renew(&fObjectSerializer);
254 fFonts.reset();
255 }
256
SkSrgbIcm()257 static sk_sp<SkData> SkSrgbIcm() {
258 // Source: http://www.argyllcms.com/icclibsrc.html
259 static const char kProfile[] =
260 "\0\0\14\214argl\2 \0\0mntrRGB XYZ \7\336\0\1\0\6\0\26\0\17\0:acspM"
261 "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"
262 "\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"
263 "\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"
264 "\0\1\354\0\0\0gdmnd\0\0\2T\0\0\0pdmdd\0\0\2\304\0\0\0\210tech\0\0\3"
265 "L\0\0\0\14vued\0\0\3X\0\0\0gview\0\0\3\300\0\0\0$lumi\0\0\3\344\0\0"
266 "\0\24meas\0\0\3\370\0\0\0$wtpt\0\0\4\34\0\0\0\24bkpt\0\0\0040\0\0\0"
267 "\24rXYZ\0\0\4D\0\0\0\24gXYZ\0\0\4X\0\0\0\24bXYZ\0\0\4l\0\0\0\24rTR"
268 "C\0\0\4\200\0\0\10\14gTRC\0\0\4\200\0\0\10\14bTRC\0\0\4\200\0\0\10"
269 "\14desc\0\0\0\0\0\0\0?sRGB IEC61966-2.1 (Equivalent to www.srgb.co"
270 "m 1998 HP profile)\0\0\0\0\0\0\0\0\0\0\0?sRGB IEC61966-2.1 (Equiva"
271 "lent to www.srgb.com 1998 HP profile)\0\0\0\0\0\0\0\0text\0\0\0\0C"
272 "reated by Graeme W. Gill. Released into the public domain. No Warr"
273 "anty, Use at your own risk.\0\0desc\0\0\0\0\0\0\0\26IEC http://www"
274 ".iec.ch\0\0\0\0\0\0\0\0\0\0\0\26IEC http://www.iec.ch\0\0\0\0\0\0\0"
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276 "\0\0\0\0\0\0desc\0\0\0\0\0\0\0.IEC 61966-2.1 Default RGB colour sp"
277 "ace - sRGB\0\0\0\0\0\0\0\0\0\0\0.IEC 61966-2.1 Default RGB colour "
278 "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"
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349 "u\253\351\254\\\254\320\255D\255\270\256-\256\241\257\26\257\213\260"
350 "\0\260u\260\352\261`\261\326\262K\262\302\2638\263\256\264%\264\234"
351 "\265\23\265\212\266\1\266y\266\360\267h\267\340\270Y\270\321\271J\271"
352 "\302\272;\272\265\273.\273\247\274!\274\233\275\25\275\217\276\n\276"
353 "\204\276\377\277z\277\365\300p\300\354\301g\301\343\302_\302\333\303"
354 "X\303\324\304Q\304\316\305K\305\310\306F\306\303\307A\307\277\310="
355 "\310\274\311:\311\271\3128\312\267\3136\313\266\3145\314\265\3155\315"
356 "\265\3166\316\266\3177\317\270\3209\320\272\321<\321\276\322?\322\301"
357 "\323D\323\306\324I\324\313\325N\325\321\326U\326\330\327\\\327\340"
358 "\330d\330\350\331l\331\361\332v\332\373\333\200\334\5\334\212\335\20"
359 "\335\226\336\34\336\242\337)\337\257\3406\340\275\341D\341\314\342"
360 "S\342\333\343c\343\353\344s\344\374\345\204\346\r\346\226\347\37\347"
361 "\251\3502\350\274\351F\351\320\352[\352\345\353p\353\373\354\206\355"
362 "\21\355\234\356(\356\264\357@\357\314\360X\360\345\361r\361\377\362"
363 "\214\363\31\363\247\3644\364\302\365P\365\336\366m\366\373\367\212"
364 "\370\31\370\250\3718\371\307\372W\372\347\373w\374\7\374\230\375)\375"
365 "\272\376K\376\334\377m\377\377";
366 const size_t kProfileLength = 3212;
367 static_assert(kProfileLength == sizeof(kProfile) - 1, "");
368 return SkData::MakeWithoutCopy(kProfile, kProfileLength);
369 }
370
make_srgb_color_profile()371 static sk_sp<SkPDFStream> make_srgb_color_profile() {
372 sk_sp<SkPDFStream> stream = sk_make_sp<SkPDFStream>(SkSrgbIcm());
373 stream->dict()->insertInt("N", 3);
374 sk_sp<SkPDFArray> array = sk_make_sp<SkPDFArray>();
375 array->appendScalar(0.0f);
376 array->appendScalar(1.0f);
377 array->appendScalar(0.0f);
378 array->appendScalar(1.0f);
379 array->appendScalar(0.0f);
380 array->appendScalar(1.0f);
381 stream->dict()->insertObject("Range", std::move(array));
382 return stream;
383 }
384
make_srgb_output_intents()385 static sk_sp<SkPDFArray> make_srgb_output_intents() {
386 // sRGB is specified by HTML, CSS, and SVG.
387 auto outputIntent = sk_make_sp<SkPDFDict>("OutputIntent");
388 outputIntent->insertName("S", "GTS_PDFA1");
389 outputIntent->insertString("RegistryName", "http://www.color.org");
390 outputIntent->insertString("OutputConditionIdentifier",
391 "Custom");
392 outputIntent->insertString("Info","sRGB IEC61966-2.1");
393 outputIntent->insertObjRef("DestOutputProfile",
394 make_srgb_color_profile());
395 auto intentArray = sk_make_sp<SkPDFArray>();
396 intentArray->appendObject(std::move(outputIntent));
397 return intentArray;
398 }
399
onClose(SkWStream * stream)400 void SkPDFDocument::onClose(SkWStream* stream) {
401 SkASSERT(!fCanvas.get());
402 if (fPages.empty()) {
403 this->reset();
404 return;
405 }
406 auto docCatalog = sk_make_sp<SkPDFDict>("Catalog");
407 if (fPDFA) {
408 SkASSERT(fXMP);
409 docCatalog->insertObjRef("Metadata", fXMP);
410 // Don't specify OutputIntents if we are not in PDF/A mode since
411 // no one has ever asked for this feature.
412 docCatalog->insertObject("OutputIntents", make_srgb_output_intents());
413 }
414 SkASSERT(!fPages.empty());
415 docCatalog->insertObjRef("Pages", generate_page_tree(&fPages));
416 SkASSERT(fPages.empty());
417
418 if (fDests->size() > 0) {
419 docCatalog->insertObjRef("Dests", std::move(fDests));
420 }
421
422 // Build font subsetting info before calling addObjectRecursively().
423 SkPDFCanon* canon = &fCanon;
424 fFonts.foreach([canon](SkPDFFont* p){ p->getFontSubset(canon); });
425 fObjectSerializer.addObjectRecursively(docCatalog);
426 fObjectSerializer.serializeObjects(this->getStream());
427 fObjectSerializer.serializeFooter(this->getStream(), docCatalog, fID);
428 this->reset();
429 }
430
431 ///////////////////////////////////////////////////////////////////////////////
432
SkPDFMakeDocument(SkWStream * stream,void (* proc)(SkWStream *,bool),SkScalar dpi,const SkDocument::PDFMetadata & metadata,sk_sp<SkPixelSerializer> jpeg,bool pdfa)433 sk_sp<SkDocument> SkPDFMakeDocument(SkWStream* stream,
434 void (*proc)(SkWStream*, bool),
435 SkScalar dpi,
436 const SkDocument::PDFMetadata& metadata,
437 sk_sp<SkPixelSerializer> jpeg,
438 bool pdfa) {
439 if (dpi <= 0) {
440 dpi = 72.0f;
441 }
442 return stream ? sk_make_sp<SkPDFDocument>(stream, proc, dpi, metadata,
443 std::move(jpeg), pdfa)
444 : nullptr;
445 }
446
MakePDF(const char path[],SkScalar dpi)447 sk_sp<SkDocument> SkDocument::MakePDF(const char path[], SkScalar dpi) {
448 auto delete_wstream = [](SkWStream* stream, bool) { delete stream; };
449 auto stream = skstd::make_unique<SkFILEWStream>(path);
450 return stream->isValid()
451 ? SkPDFMakeDocument(stream.release(), delete_wstream, dpi,
452 SkDocument::PDFMetadata(), nullptr,
453 false)
454 : nullptr;
455 }
456
MakePDF(SkWStream * stream,SkScalar dpi,const SkDocument::PDFMetadata & metadata,sk_sp<SkPixelSerializer> jpegEncoder,bool pdfa)457 sk_sp<SkDocument> SkDocument::MakePDF(SkWStream* stream,
458 SkScalar dpi,
459 const SkDocument::PDFMetadata& metadata,
460 sk_sp<SkPixelSerializer> jpegEncoder,
461 bool pdfa) {
462 return SkPDFMakeDocument(stream, nullptr, dpi, metadata,
463 std::move(jpegEncoder), pdfa);
464 }
465