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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"
275         "\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"
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"
279         "\0CRT desc\0\0\0\0\0\0\0\rIEC61966-2.1\0\0\0\0\0\0\0\0\0\0\0\rIEC6"
280         "1966-2.1\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"
281         "\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\0view\0\0\0\0"
282         "\0\23\244|\0\24_0\0\20\316\2\0\3\355\262\0\4\23\n\0\3\\g\0\0\0\1XY"
283         "Z \0\0\0\0\0L\n=\0P\0\0\0W\36\270meas\0\0\0\0\0\0\0\1\0\0\0\0\0\0\0"
284         "\0\0\0\0\0\0\0\0\0\0\0\2\217\0\0\0\2XYZ \0\0\0\0\0\0\363Q\0\1\0\0\0"
285         "\1\26\314XYZ \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0XYZ \0\0\0\0\0\0o\240"
286         "\0\0008\365\0\0\3\220XYZ \0\0\0\0\0\0b\227\0\0\267\207\0\0\30\331X"
287         "YZ \0\0\0\0\0\0$\237\0\0\17\204\0\0\266\304curv\0\0\0\0\0\0\4\0\0\0"
288         "\0\5\0\n\0\17\0\24\0\31\0\36\0#\0(\0-\0002\0007\0;\0@\0E\0J\0O\0T\0"
289         "Y\0^\0c\0h\0m\0r\0w\0|\0\201\0\206\0\213\0\220\0\225\0\232\0\237\0"
290         "\244\0\251\0\256\0\262\0\267\0\274\0\301\0\306\0\313\0\320\0\325\0"
291         "\333\0\340\0\345\0\353\0\360\0\366\0\373\1\1\1\7\1\r\1\23\1\31\1\37"
292         "\1%\1+\0012\0018\1>\1E\1L\1R\1Y\1`\1g\1n\1u\1|\1\203\1\213\1\222\1"
293         "\232\1\241\1\251\1\261\1\271\1\301\1\311\1\321\1\331\1\341\1\351\1"
294         "\362\1\372\2\3\2\14\2\24\2\35\2&\2/\0028\2A\2K\2T\2]\2g\2q\2z\2\204"
295         "\2\216\2\230\2\242\2\254\2\266\2\301\2\313\2\325\2\340\2\353\2\365"
296         "\3\0\3\13\3\26\3!\3-\0038\3C\3O\3Z\3f\3r\3~\3\212\3\226\3\242\3\256"
297         "\3\272\3\307\3\323\3\340\3\354\3\371\4\6\4\23\4 \4-\4;\4H\4U\4c\4q"
298         "\4~\4\214\4\232\4\250\4\266\4\304\4\323\4\341\4\360\4\376\5\r\5\34"
299         "\5+\5:\5I\5X\5g\5w\5\206\5\226\5\246\5\265\5\305\5\325\5\345\5\366"
300         "\6\6\6\26\6'\0067\6H\6Y\6j\6{\6\214\6\235\6\257\6\300\6\321\6\343\6"
301         "\365\7\7\7\31\7+\7=\7O\7a\7t\7\206\7\231\7\254\7\277\7\322\7\345\7"
302         "\370\10\13\10\37\0102\10F\10Z\10n\10\202\10\226\10\252\10\276\10\322"
303         "\10\347\10\373\t\20\t%\t:\tO\td\ty\t\217\t\244\t\272\t\317\t\345\t"
304         "\373\n\21\n'\n=\nT\nj\n\201\n\230\n\256\n\305\n\334\n\363\13\13\13"
305         "\"\0139\13Q\13i\13\200\13\230\13\260\13\310\13\341\13\371\14\22\14"
306         "*\14C\14\\\14u\14\216\14\247\14\300\14\331\14\363\r\r\r&\r@\rZ\rt\r"
307         "\216\r\251\r\303\r\336\r\370\16\23\16.\16I\16d\16\177\16\233\16\266"
308         "\16\322\16\356\17\t\17%\17A\17^\17z\17\226\17\263\17\317\17\354\20"
309         "\t\20&\20C\20a\20~\20\233\20\271\20\327\20\365\21\23\0211\21O\21m\21"
310         "\214\21\252\21\311\21\350\22\7\22&\22E\22d\22\204\22\243\22\303\22"
311         "\343\23\3\23#\23C\23c\23\203\23\244\23\305\23\345\24\6\24'\24I\24j"
312         "\24\213\24\255\24\316\24\360\25\22\0254\25V\25x\25\233\25\275\25\340"
313         "\26\3\26&\26I\26l\26\217\26\262\26\326\26\372\27\35\27A\27e\27\211"
314         "\27\256\27\322\27\367\30\33\30@\30e\30\212\30\257\30\325\30\372\31"
315         " \31E\31k\31\221\31\267\31\335\32\4\32*\32Q\32w\32\236\32\305\32\354"
316         "\33\24\33;\33c\33\212\33\262\33\332\34\2\34*\34R\34{\34\243\34\314"
317         "\34\365\35\36\35G\35p\35\231\35\303\35\354\36\26\36@\36j\36\224\36"
318         "\276\36\351\37\23\37>\37i\37\224\37\277\37\352 \25 A l \230 \304 \360"
319         "!\34!H!u!\241!\316!\373\"'\"U\"\202\"\257\"\335#\n#8#f#\224#\302#\360"
320         "$\37$M$|$\253$\332%\t%8%h%\227%\307%\367&'&W&\207&\267&\350'\30'I'"
321         "z'\253'\334(\r(?(q(\242(\324)\6)8)k)\235)\320*\2*5*h*\233*\317+\2+"
322         "6+i+\235+\321,\5,9,n,\242,\327-\14-A-v-\253-\341.\26.L.\202.\267.\356"
323         "/$/Z/\221/\307/\376050l0\2440\3331\0221J1\2021\2721\3622*2c2\2332\324"
324         "3\r3F3\1773\2703\3614+4e4\2364\3305\0235M5\2075\3025\375676r6\2566"
325         "\3517$7`7\2347\3278\0248P8\2148\3109\0059B9\1779\2749\371:6:t:\262"
326         ":\357;-;k;\252;\350<'<e<\244<\343=\"=a=\241=\340> >`>\240>\340?!?a"
327         "?\242?\342@#@d@\246@\347A)AjA\254A\356B0BrB\265B\367C:C}C\300D\3DG"
328         "D\212D\316E\22EUE\232E\336F\"FgF\253F\360G5G{G\300H\5HKH\221H\327I"
329         "\35IcI\251I\360J7J}J\304K\14KSK\232K\342L*LrL\272M\2MJM\223M\334N%"
330         "NnN\267O\0OIO\223O\335P'PqP\273Q\6QPQ\233Q\346R1R|R\307S\23S_S\252"
331         "S\366TBT\217T\333U(UuU\302V\17V\\V\251V\367WDW\222W\340X/X}X\313Y\32"
332         "YiY\270Z\7ZVZ\246Z\365[E[\225[\345\\5\\\206\\\326]']x]\311^\32^l^\275"
333         "_\17_a_\263`\5`W`\252`\374aOa\242a\365bIb\234b\360cCc\227c\353d@d\224"
334         "d\351e=e\222e\347f=f\222f\350g=g\223g\351h?h\226h\354iCi\232i\361j"
335         "Hj\237j\367kOk\247k\377lWl\257m\10m`m\271n\22nkn\304o\36oxo\321p+p"
336         "\206p\340q:q\225q\360rKr\246s\1s]s\270t\24tpt\314u(u\205u\341v>v\233"
337         "v\370wVw\263x\21xnx\314y*y\211y\347zFz\245{\4{c{\302|!|\201|\341}A"
338         "}\241~\1~b~\302\177#\177\204\177\345\200G\200\250\201\n\201k\201\315"
339         "\2020\202\222\202\364\203W\203\272\204\35\204\200\204\343\205G\205"
340         "\253\206\16\206r\206\327\207;\207\237\210\4\210i\210\316\2113\211\231"
341         "\211\376\212d\212\312\2130\213\226\213\374\214c\214\312\2151\215\230"
342         "\215\377\216f\216\316\2176\217\236\220\6\220n\220\326\221?\221\250"
343         "\222\21\222z\222\343\223M\223\266\224 \224\212\224\364\225_\225\311"
344         "\2264\226\237\227\n\227u\227\340\230L\230\270\231$\231\220\231\374"
345         "\232h\232\325\233B\233\257\234\34\234\211\234\367\235d\235\322\236"
346         "@\236\256\237\35\237\213\237\372\240i\240\330\241G\241\266\242&\242"
347         "\226\243\6\243v\243\346\244V\244\307\2458\245\251\246\32\246\213\246"
348         "\375\247n\247\340\250R\250\304\2517\251\251\252\34\252\217\253\2\253"
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