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 "include/docs/SkPDFDocument.h"
9#include "src/pdf/SkPDFDocumentPriv.h"
10
11#include "include/core/SkStream.h"
12#include "include/docs/SkPDFDocument.h"
13#include "include/private/SkTo.h"
14#include "src/pdf/SkPDFDevice.h"
15#include "src/pdf/SkPDFFont.h"
16#include "src/pdf/SkPDFGradientShader.h"
17#include "src/pdf/SkPDFGraphicState.h"
18#include "src/pdf/SkPDFShader.h"
19#include "src/pdf/SkPDFTag.h"
20#include "src/pdf/SkPDFUtils.h"
21#include "src/utils/SkUTF.h"
22
23#include <utility>
24
25// For use in SkCanvas::drawAnnotation
26const char* SkPDFGetNodeIdKey() {
27 static constexpr char key[] = "PDF_Node_Key";
28 return key;
29}
30
31static SkString ToValidUtf8String(const SkData& d) {
32 if (d.size() == 0) {
33 SkDEBUGFAIL("Not a valid string, data length is zero.");
34 return SkString();
35 }
36
37 const char* c_str = static_cast<const char*>(d.data());
38 if (c_str[d.size() - 1] != 0) {
39 SkDEBUGFAIL("Not a valid string, not null-terminated.");
40 return SkString();
41 }
42
43 // CountUTF8 returns -1 if there's an invalid UTF-8 byte sequence.
44 int valid_utf8_chars_count = SkUTF::CountUTF8(c_str, d.size() - 1);
45 if (valid_utf8_chars_count == -1) {
46 SkDEBUGFAIL("Not a valid UTF-8 string.");
47 return SkString();
48 }
49
50 return SkString(c_str, d.size() - 1);
51}
52
53////////////////////////////////////////////////////////////////////////////////
54
55void SkPDFOffsetMap::markStartOfDocument(const SkWStream* s) { fBaseOffset = s->bytesWritten(); }
56
57static size_t difference(size_t minuend, size_t subtrahend) {
58 return SkASSERT(minuend >= subtrahend), minuend - subtrahend;
59}
60
61void SkPDFOffsetMap::markStartOfObject(int referenceNumber, const SkWStream* s) {
62 SkASSERT(referenceNumber > 0);
63 size_t index = SkToSizeT(referenceNumber - 1);
64 if (index >= fOffsets.size()) {
65 fOffsets.resize(index + 1);
66 }
67 fOffsets[index] = SkToInt(difference(s->bytesWritten(), fBaseOffset));
68}
69
70int SkPDFOffsetMap::objectCount() const {
71 return SkToInt(fOffsets.size() + 1); // Include the special zeroth object in the count.
72}
73
74int SkPDFOffsetMap::emitCrossReferenceTable(SkWStream* s) const {
75 int xRefFileOffset = SkToInt(difference(s->bytesWritten(), fBaseOffset));
76 s->writeText("xref\n0 ");
77 s->writeDecAsText(this->objectCount());
78 s->writeText("\n0000000000 65535 f \n");
79 for (int offset : fOffsets) {
80 SkASSERT(offset > 0); // Offset was set.
81 s->writeBigDecAsText(offset, 10);
82 s->writeText(" 00000 n \n");
83 }
84 return xRefFileOffset;
85}
86//
87////////////////////////////////////////////////////////////////////////////////
88
89#define SKPDF_MAGIC "\xD3\xEB\xE9\xE1"
90#ifndef SK_BUILD_FOR_WIN
91static_assert((SKPDF_MAGIC[0] & 0x7F) == "Skia"[0], "");
92static_assert((SKPDF_MAGIC[1] & 0x7F) == "Skia"[1], "");
93static_assert((SKPDF_MAGIC[2] & 0x7F) == "Skia"[2], "");
94static_assert((SKPDF_MAGIC[3] & 0x7F) == "Skia"[3], "");
95#endif
96static void serializeHeader(SkPDFOffsetMap* offsetMap, SkWStream* wStream) {
97 offsetMap->markStartOfDocument(wStream);
98 wStream->writeText("%PDF-1.4\n%" SKPDF_MAGIC "\n");
99 // The PDF spec recommends including a comment with four
100 // bytes, all with their high bits set. "\xD3\xEB\xE9\xE1" is
101 // "Skia" with the high bits set.
102}
103#undef SKPDF_MAGIC
104
105static void begin_indirect_object(SkPDFOffsetMap* offsetMap,
106 SkPDFIndirectReference ref,
107 SkWStream* s) {
108 offsetMap->markStartOfObject(ref.fValue, s);
109 s->writeDecAsText(ref.fValue);
110 s->writeText(" 0 obj\n"); // Generation number is always 0.
111}
112
113static void end_indirect_object(SkWStream* s) { s->writeText("\nendobj\n"); }
114
115// Xref table and footer
116static void serialize_footer(const SkPDFOffsetMap& offsetMap,
117 SkWStream* wStream,
118 SkPDFIndirectReference infoDict,
119 SkPDFIndirectReference docCatalog,
120 SkUUID uuid) {
121 int xRefFileOffset = offsetMap.emitCrossReferenceTable(wStream);
122 SkPDFDict trailerDict;
123 trailerDict.insertInt("Size", offsetMap.objectCount());
124 SkASSERT(docCatalog != SkPDFIndirectReference());
125 trailerDict.insertRef("Root", docCatalog);
126 SkASSERT(infoDict != SkPDFIndirectReference());
127 trailerDict.insertRef("Info", infoDict);
128 if (SkUUID() != uuid) {
129 trailerDict.insertObject("ID", SkPDFMetadata::MakePdfId(uuid, uuid));
130 }
131 wStream->writeText("trailer\n");
132 trailerDict.emitObject(wStream);
133 wStream->writeText("\nstartxref\n");
134 wStream->writeBigDecAsText(xRefFileOffset);
135 wStream->writeText("\n%%EOF");
136}
137
138static SkPDFIndirectReference generate_page_tree(
139 SkPDFDocument* doc,
140 std::vector<std::unique_ptr<SkPDFDict>> pages,
141 const std::vector<SkPDFIndirectReference>& pageRefs) {
142 // PDF wants a tree describing all the pages in the document. We arbitrary
143 // choose 8 (kNodeSize) as the number of allowed children. The internal
144 // nodes have type "Pages" with an array of children, a parent pointer, and
145 // the number of leaves below the node as "Count." The leaves are passed
146 // into the method, have type "Page" and need a parent pointer. This method
147 // builds the tree bottom up, skipping internal nodes that would have only
148 // one child.
149 SkASSERT(pages.size() > 0);
150 struct PageTreeNode {
151 std::unique_ptr<SkPDFDict> fNode;
152 SkPDFIndirectReference fReservedRef;
153 int fPageObjectDescendantCount;
154
155 static std::vector<PageTreeNode> Layer(std::vector<PageTreeNode> vec, SkPDFDocument* doc) {
156 std::vector<PageTreeNode> result;
157 static constexpr size_t kMaxNodeSize = 8;
158 const size_t n = vec.size();
159 SkASSERT(n >= 1);
160 const size_t result_len = (n - 1) / kMaxNodeSize + 1;
161 SkASSERT(result_len >= 1);
162 SkASSERT(n == 1 || result_len < n);
163 result.reserve(result_len);
164 size_t index = 0;
165 for (size_t i = 0; i < result_len; ++i) {
166 if (n != 1 && index + 1 == n) { // No need to create a new node.
167 result.push_back(std::move(vec[index++]));
168 continue;
169 }
170 SkPDFIndirectReference parent = doc->reserveRef();
171 auto kids_list = SkPDFMakeArray();
172 int descendantCount = 0;
173 for (size_t j = 0; j < kMaxNodeSize && index < n; ++j) {
174 PageTreeNode& node = vec[index++];
175 node.fNode->insertRef("Parent", parent);
176 kids_list->appendRef(doc->emit(*node.fNode, node.fReservedRef));
177 descendantCount += node.fPageObjectDescendantCount;
178 }
179 auto next = SkPDFMakeDict("Pages");
180 next->insertInt("Count", descendantCount);
181 next->insertObject("Kids", std::move(kids_list));
182 result.push_back(PageTreeNode{std::move(next), parent, descendantCount});
183 }
184 return result;
185 }
186 };
187 std::vector<PageTreeNode> currentLayer;
188 currentLayer.reserve(pages.size());
189 SkASSERT(pages.size() == pageRefs.size());
190 for (size_t i = 0; i < pages.size(); ++i) {
191 currentLayer.push_back(PageTreeNode{std::move(pages[i]), pageRefs[i], 1});
192 }
193 currentLayer = PageTreeNode::Layer(std::move(currentLayer), doc);
194 while (currentLayer.size() > 1) {
195 currentLayer = PageTreeNode::Layer(std::move(currentLayer), doc);
196 }
197 SkASSERT(currentLayer.size() == 1);
198 const PageTreeNode& root = currentLayer[0];
199 return doc->emit(*root.fNode, root.fReservedRef);
200}
201
202template<typename T, typename... Args>
203static void reset_object(T* dst, Args&&... args) {
204 dst->~T();
205 new (dst) T(std::forward<Args>(args)...);
206}
207
208////////////////////////////////////////////////////////////////////////////////
209
210SkPDFDocument::SkPDFDocument(SkWStream* stream,
211 SkPDF::Metadata metadata)
212 : SkDocument(stream)
213 , fMetadata(std::move(metadata)) {
214 constexpr float kDpiForRasterScaleOne = 72.0f;
215 if (fMetadata.fRasterDPI != kDpiForRasterScaleOne) {
216 fInverseRasterScale = kDpiForRasterScaleOne / fMetadata.fRasterDPI;
217 fRasterScale = fMetadata.fRasterDPI / kDpiForRasterScaleOne;
218 }
219 if (fMetadata.fStructureElementTreeRoot) {
220 fTagTree.init(fMetadata.fStructureElementTreeRoot);
221 }
222 fExecutor = metadata.fExecutor;
223}
224
225SkPDFDocument::~SkPDFDocument() {
226 // subclasses of SkDocument must call close() in their destructors.
227 this->close();
228}
229
230SkPDFIndirectReference SkPDFDocument::emit(const SkPDFObject& object, SkPDFIndirectReference ref){
231 SkAutoMutexExclusive lock(fMutex);
232 object.emitObject(this->beginObject(ref));
233 this->endObject();
234 return ref;
235}
236
237SkWStream* SkPDFDocument::beginObject(SkPDFIndirectReference ref) SK_REQUIRES(fMutex) {
238 begin_indirect_object(&fOffsetMap, ref, this->getStream());
239 return this->getStream();
240};
241
242void SkPDFDocument::endObject() SK_REQUIRES(fMutex) {
243 end_indirect_object(this->getStream());
244};
245
246static SkSize operator*(SkISize u, SkScalar s) { return SkSize{u.width() * s, u.height() * s}; }
247static SkSize operator*(SkSize u, SkScalar s) { return SkSize{u.width() * s, u.height() * s}; }
248
249SkCanvas* SkPDFDocument::onBeginPage(SkScalar width, SkScalar height) {
250 SkASSERT(fCanvas.imageInfo().dimensions().isZero());
251 if (fPages.empty()) {
252 // if this is the first page if the document.
253 {
254 SkAutoMutexExclusive autoMutexAcquire(fMutex);
255 serializeHeader(&fOffsetMap, this->getStream());
256
257 }
258
259 fInfoDict = this->emit(*SkPDFMetadata::MakeDocumentInformationDict(fMetadata));
260 if (fMetadata.fPDFA) {
261 fUUID = SkPDFMetadata::CreateUUID(fMetadata);
262 // We use the same UUID for Document ID and Instance ID since this
263 // is the first revision of this document (and Skia does not
264 // support revising existing PDF documents).
265 // If we are not in PDF/A mode, don't use a UUID since testing
266 // works best with reproducible outputs.
267 fXMP = SkPDFMetadata::MakeXMPObject(fMetadata, fUUID, fUUID, this);
268 }
269 }
270 // By scaling the page at the device level, we will create bitmap layer
271 // devices at the rasterized scale, not the 72dpi scale. Bitmap layer
272 // devices are created when saveLayer is called with an ImageFilter; see
273 // SkPDFDevice::onCreateDevice().
274 SkISize pageSize = (SkSize{width, height} * fRasterScale).toRound();
275 SkMatrix initialTransform;
276 // Skia uses the top left as the origin but PDF natively has the origin at the
277 // bottom left. This matrix corrects for that, as well as the raster scale.
278 initialTransform.setScaleTranslate(fInverseRasterScale, -fInverseRasterScale,
279 0, fInverseRasterScale * pageSize.height());
280 fPageDevice = sk_make_sp<SkPDFDevice>(pageSize, this, initialTransform);
281 reset_object(&fCanvas, fPageDevice);
282 fCanvas.scale(fRasterScale, fRasterScale);
283 fPageRefs.push_back(this->reserveRef());
284 return &fCanvas;
285}
286
287static void populate_link_annotation(SkPDFDict* annotation, const SkRect& r) {
288 annotation->insertName("Subtype", "Link");
289 annotation->insertInt("F", 4); // required by ISO 19005
290 // Border: 0 = Horizontal corner radius.
291 // 0 = Vertical corner radius.
292 // 0 = Width, 0 = no border.
293 annotation->insertObject("Border", SkPDFMakeArray(0, 0, 0));
294 annotation->insertObject("Rect", SkPDFMakeArray(r.fLeft, r.fTop, r.fRight, r.fBottom));
295}
296
297static SkPDFIndirectReference append_destinations(
298 SkPDFDocument* doc,
299 const std::vector<SkPDFNamedDestination>& namedDestinations)
300{
301 SkPDFDict destinations;
302 for (const SkPDFNamedDestination& dest : namedDestinations) {
303 auto pdfDest = SkPDFMakeArray();
304 pdfDest->reserve(5);
305 pdfDest->appendRef(dest.fPage);
306 pdfDest->appendName("XYZ");
307 pdfDest->appendScalar(dest.fPoint.x());
308 pdfDest->appendScalar(dest.fPoint.y());
309 pdfDest->appendInt(0); // Leave zoom unchanged
310 destinations.insertObject(ToValidUtf8String(*dest.fName), std::move(pdfDest));
311 }
312 return doc->emit(destinations);
313}
314
315std::unique_ptr<SkPDFArray> SkPDFDocument::getAnnotations() {
316 std::unique_ptr<SkPDFArray> array;
317 size_t count = fCurrentPageLinks.size();
318 if (0 == count) {
319 return array; // is nullptr
320 }
321 array = SkPDFMakeArray();
322 array->reserve(count);
323 for (const auto& link : fCurrentPageLinks) {
324 SkPDFDict annotation("Annot");
325 populate_link_annotation(&annotation, link->fRect);
326 if (link->fType == SkPDFLink::Type::kUrl) {
327 std::unique_ptr<SkPDFDict> action = SkPDFMakeDict("Action");
328 action->insertName("S", "URI");
329 action->insertString("URI", ToValidUtf8String(*link->fData));
330 annotation.insertObject("A", std::move(action));
331 } else if (link->fType == SkPDFLink::Type::kNamedDestination) {
332 annotation.insertName("Dest", ToValidUtf8String(*link->fData));
333 } else {
334 SkDEBUGFAIL("Unknown link type.");
335 }
336
337 SkPDFIndirectReference annotationRef = emit(annotation);
338 array->appendRef(annotationRef);
339 if (link->fNodeId) {
340 fTagTree.addNodeAnnotation(link->fNodeId, annotationRef);
341 }
342 }
343 return array;
344}
345
346void SkPDFDocument::onEndPage() {
347 SkASSERT(!fCanvas.imageInfo().dimensions().isZero());
348 reset_object(&fCanvas);
349 SkASSERT(fPageDevice);
350
351 auto page = SkPDFMakeDict("Page");
352
353 SkSize mediaSize = fPageDevice->imageInfo().dimensions() * fInverseRasterScale;
354 std::unique_ptr<SkStreamAsset> pageContent = fPageDevice->content();
355 auto resourceDict = fPageDevice->makeResourceDict();
356 SkASSERT(fPageRefs.size() > 0);
357 fPageDevice = nullptr;
358
359 page->insertObject("Resources", std::move(resourceDict));
360 page->insertObject("MediaBox", SkPDFUtils::RectToArray(SkRect::MakeSize(mediaSize)));
361
362 if (std::unique_ptr<SkPDFArray> annotations = getAnnotations()) {
363 page->insertObject("Annots", std::move(annotations));
364 fCurrentPageLinks.clear();
365 }
366
367 page->insertRef("Contents", SkPDFStreamOut(nullptr, std::move(pageContent), this));
368 // The StructParents unique identifier for each page is just its
369 // 0-based page index.
370 page->insertInt("StructParents", SkToInt(this->currentPageIndex()));
371 fPages.emplace_back(std::move(page));
372}
373
374void SkPDFDocument::onAbort() {
375 this->waitForJobs();
376}
377
378static sk_sp<SkData> SkSrgbIcm() {
379 // Source: http://www.argyllcms.com/icclibsrc.html
380 static const char kProfile[] =
381 "\0\0\14\214argl\2 \0\0mntrRGB XYZ \7\336\0\1\0\6\0\26\0\17\0:acspM"
382 "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"
383 "\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"
384 "\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"
385 "\0\1\354\0\0\0gdmnd\0\0\2T\0\0\0pdmdd\0\0\2\304\0\0\0\210tech\0\0\3"
386 "L\0\0\0\14vued\0\0\3X\0\0\0gview\0\0\3\300\0\0\0$lumi\0\0\3\344\0\0"
387 "\0\24meas\0\0\3\370\0\0\0$wtpt\0\0\4\34\0\0\0\24bkpt\0\0\0040\0\0\0"
388 "\24rXYZ\0\0\4D\0\0\0\24gXYZ\0\0\4X\0\0\0\24bXYZ\0\0\4l\0\0\0\24rTR"
389 "C\0\0\4\200\0\0\10\14gTRC\0\0\4\200\0\0\10\14bTRC\0\0\4\200\0\0\10"
390 "\14desc\0\0\0\0\0\0\0?sRGB IEC61966-2.1 (Equivalent to www.srgb.co"
391 "m 1998 HP profile)\0\0\0\0\0\0\0\0\0\0\0?sRGB IEC61966-2.1 (Equiva"
392 "lent to www.srgb.com 1998 HP profile)\0\0\0\0\0\0\0\0text\0\0\0\0C"
393 "reated by Graeme W. Gill. Released into the public domain. No Warr"
394 "anty, Use at your own risk.\0\0desc\0\0\0\0\0\0\0\26IEC http://www"
395 ".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"
396 "\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"
397 "\0\0\0\0\0\0desc\0\0\0\0\0\0\0.IEC 61966-2.1 Default RGB colour sp"
398 "ace - sRGB\0\0\0\0\0\0\0\0\0\0\0.IEC 61966-2.1 Default RGB colour "
399 "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"
400 "\0CRT desc\0\0\0\0\0\0\0\rIEC61966-2.1\0\0\0\0\0\0\0\0\0\0\0\rIEC6"
401 "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"
402 "\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"
403 "\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"
404 "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"
405 "\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"
406 "\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"
407 "\0\0008\365\0\0\3\220XYZ \0\0\0\0\0\0b\227\0\0\267\207\0\0\30\331X"
408 "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"
409 "\0\5\0\n\0\17\0\24\0\31\0\36\0#\0(\0-\0002\0007\0;\0@\0E\0J\0O\0T\0"
410 "Y\0^\0c\0h\0m\0r\0w\0|\0\201\0\206\0\213\0\220\0\225\0\232\0\237\0"
411 "\244\0\251\0\256\0\262\0\267\0\274\0\301\0\306\0\313\0\320\0\325\0"
412 "\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"
413 "\1%\1+\0012\0018\1>\1E\1L\1R\1Y\1`\1g\1n\1u\1|\1\203\1\213\1\222\1"
414 "\232\1\241\1\251\1\261\1\271\1\301\1\311\1\321\1\331\1\341\1\351\1"
415 "\362\1\372\2\3\2\14\2\24\2\35\2&\2/\0028\2A\2K\2T\2]\2g\2q\2z\2\204"
416 "\2\216\2\230\2\242\2\254\2\266\2\301\2\313\2\325\2\340\2\353\2\365"
417 "\3\0\3\13\3\26\3!\3-\0038\3C\3O\3Z\3f\3r\3~\3\212\3\226\3\242\3\256"
418 "\3\272\3\307\3\323\3\340\3\354\3\371\4\6\4\23\4 \4-\4;\4H\4U\4c\4q"
419 "\4~\4\214\4\232\4\250\4\266\4\304\4\323\4\341\4\360\4\376\5\r\5\34"
420 "\5+\5:\5I\5X\5g\5w\5\206\5\226\5\246\5\265\5\305\5\325\5\345\5\366"
421 "\6\6\6\26\6'\0067\6H\6Y\6j\6{\6\214\6\235\6\257\6\300\6\321\6\343\6"
422 "\365\7\7\7\31\7+\7=\7O\7a\7t\7\206\7\231\7\254\7\277\7\322\7\345\7"
423 "\370\10\13\10\37\0102\10F\10Z\10n\10\202\10\226\10\252\10\276\10\322"
424 "\10\347\10\373\t\20\t%\t:\tO\td\ty\t\217\t\244\t\272\t\317\t\345\t"
425 "\373\n\21\n'\n=\nT\nj\n\201\n\230\n\256\n\305\n\334\n\363\13\13\13"
426 "\"\0139\13Q\13i\13\200\13\230\13\260\13\310\13\341\13\371\14\22\14"
427 "*\14C\14\\\14u\14\216\14\247\14\300\14\331\14\363\r\r\r&\r@\rZ\rt\r"
428 "\216\r\251\r\303\r\336\r\370\16\23\16.\16I\16d\16\177\16\233\16\266"
429 "\16\322\16\356\17\t\17%\17A\17^\17z\17\226\17\263\17\317\17\354\20"
430 "\t\20&\20C\20a\20~\20\233\20\271\20\327\20\365\21\23\0211\21O\21m\21"
431 "\214\21\252\21\311\21\350\22\7\22&\22E\22d\22\204\22\243\22\303\22"
432 "\343\23\3\23#\23C\23c\23\203\23\244\23\305\23\345\24\6\24'\24I\24j"
433 "\24\213\24\255\24\316\24\360\25\22\0254\25V\25x\25\233\25\275\25\340"
434 "\26\3\26&\26I\26l\26\217\26\262\26\326\26\372\27\35\27A\27e\27\211"
435 "\27\256\27\322\27\367\30\33\30@\30e\30\212\30\257\30\325\30\372\31"
436 " \31E\31k\31\221\31\267\31\335\32\4\32*\32Q\32w\32\236\32\305\32\354"
437 "\33\24\33;\33c\33\212\33\262\33\332\34\2\34*\34R\34{\34\243\34\314"
438 "\34\365\35\36\35G\35p\35\231\35\303\35\354\36\26\36@\36j\36\224\36"
439 "\276\36\351\37\23\37>\37i\37\224\37\277\37\352 \25 A l \230 \304 \360"
440 "!\34!H!u!\241!\316!\373\"'\"U\"\202\"\257\"\335#\n#8#f#\224#\302#\360"
441 "$\37$M$|$\253$\332%\t%8%h%\227%\307%\367&'&W&\207&\267&\350'\30'I'"
442 "z'\253'\334(\r(?(q(\242(\324)\6)8)k)\235)\320*\2*5*h*\233*\317+\2+"
443 "6+i+\235+\321,\5,9,n,\242,\327-\14-A-v-\253-\341.\26.L.\202.\267.\356"
444 "/$/Z/\221/\307/\376050l0\2440\3331\0221J1\2021\2721\3622*2c2\2332\324"
445 "3\r3F3\1773\2703\3614+4e4\2364\3305\0235M5\2075\3025\375676r6\2566"
446 "\3517$7`7\2347\3278\0248P8\2148\3109\0059B9\1779\2749\371:6:t:\262"
447 ":\357;-;k;\252;\350<'<e<\244<\343=\"=a=\241=\340> >`>\240>\340?!?a"
448 "?\242?\342@#@d@\246@\347A)AjA\254A\356B0BrB\265B\367C:C}C\300D\3DG"
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450 "\35IcI\251I\360J7J}J\304K\14KSK\232K\342L*LrL\272M\2MJM\223M\334N%"
451 "NnN\267O\0OIO\223O\335P'PqP\273Q\6QPQ\233Q\346R1R|R\307S\23S_S\252"
452 "S\366TBT\217T\333U(UuU\302V\17V\\V\251V\367WDW\222W\340X/X}X\313Y\32"
453 "YiY\270Z\7ZVZ\246Z\365[E[\225[\345\\5\\\206\\\326]']x]\311^\32^l^\275"
454 "_\17_a_\263`\5`W`\252`\374aOa\242a\365bIb\234b\360cCc\227c\353d@d\224"
455 "d\351e=e\222e\347f=f\222f\350g=g\223g\351h?h\226h\354iCi\232i\361j"
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457 "\206p\340q:q\225q\360rKr\246s\1s]s\270t\24tpt\314u(u\205u\341v>v\233"
458 "v\370wVw\263x\21xnx\314y*y\211y\347zFz\245{\4{c{\302|!|\201|\341}A"
459 "}\241~\1~b~\302\177#\177\204\177\345\200G\200\250\201\n\201k\201\315"
460 "\2020\202\222\202\364\203W\203\272\204\35\204\200\204\343\205G\205"
461 "\253\206\16\206r\206\327\207;\207\237\210\4\210i\210\316\2113\211\231"
462 "\211\376\212d\212\312\2130\213\226\213\374\214c\214\312\2151\215\230"
463 "\215\377\216f\216\316\2176\217\236\220\6\220n\220\326\221?\221\250"
464 "\222\21\222z\222\343\223M\223\266\224 \224\212\224\364\225_\225\311"
465 "\2264\226\237\227\n\227u\227\340\230L\230\270\231$\231\220\231\374"
466 "\232h\232\325\233B\233\257\234\34\234\211\234\367\235d\235\322\236"
467 "@\236\256\237\35\237\213\237\372\240i\240\330\241G\241\266\242&\242"
468 "\226\243\6\243v\243\346\244V\244\307\2458\245\251\246\32\246\213\246"
469 "\375\247n\247\340\250R\250\304\2517\251\251\252\34\252\217\253\2\253"
470 "u\253\351\254\\\254\320\255D\255\270\256-\256\241\257\26\257\213\260"
471 "\0\260u\260\352\261`\261\326\262K\262\302\2638\263\256\264%\264\234"
472 "\265\23\265\212\266\1\266y\266\360\267h\267\340\270Y\270\321\271J\271"
473 "\302\272;\272\265\273.\273\247\274!\274\233\275\25\275\217\276\n\276"
474 "\204\276\377\277z\277\365\300p\300\354\301g\301\343\302_\302\333\303"
475 "X\303\324\304Q\304\316\305K\305\310\306F\306\303\307A\307\277\310="
476 "\310\274\311:\311\271\3128\312\267\3136\313\266\3145\314\265\3155\315"
477 "\265\3166\316\266\3177\317\270\3209\320\272\321<\321\276\322?\322\301"
478 "\323D\323\306\324I\324\313\325N\325\321\326U\326\330\327\\\327\340"
479 "\330d\330\350\331l\331\361\332v\332\373\333\200\334\5\334\212\335\20"
480 "\335\226\336\34\336\242\337)\337\257\3406\340\275\341D\341\314\342"
481 "S\342\333\343c\343\353\344s\344\374\345\204\346\r\346\226\347\37\347"
482 "\251\3502\350\274\351F\351\320\352[\352\345\353p\353\373\354\206\355"
483 "\21\355\234\356(\356\264\357@\357\314\360X\360\345\361r\361\377\362"
484 "\214\363\31\363\247\3644\364\302\365P\365\336\366m\366\373\367\212"
485 "\370\31\370\250\3718\371\307\372W\372\347\373w\374\7\374\230\375)\375"
486 "\272\376K\376\334\377m\377\377";
487 const size_t kProfileLength = 3212;
488 static_assert(kProfileLength == sizeof(kProfile) - 1, "");
489 return SkData::MakeWithoutCopy(kProfile, kProfileLength);
490}
491
492static SkPDFIndirectReference make_srgb_color_profile(SkPDFDocument* doc) {
493 std::unique_ptr<SkPDFDict> dict = SkPDFMakeDict();
494 dict->insertInt("N", 3);
495 dict->insertObject("Range", SkPDFMakeArray(0, 1, 0, 1, 0, 1));
496 return SkPDFStreamOut(std::move(dict), SkMemoryStream::Make(SkSrgbIcm()), doc, true);
497}
498
499static std::unique_ptr<SkPDFArray> make_srgb_output_intents(SkPDFDocument* doc) {
500 // sRGB is specified by HTML, CSS, and SVG.
501 auto outputIntent = SkPDFMakeDict("OutputIntent");
502 outputIntent->insertName("S", "GTS_PDFA1");
503 outputIntent->insertString("RegistryName", "http://www.color.org");
504 outputIntent->insertString("OutputConditionIdentifier",
505 "Custom");
506 outputIntent->insertString("Info","sRGB IEC61966-2.1");
507 outputIntent->insertRef("DestOutputProfile", make_srgb_color_profile(doc));
508 auto intentArray = SkPDFMakeArray();
509 intentArray->appendObject(std::move(outputIntent));
510 return intentArray;
511}
512
513SkPDFIndirectReference SkPDFDocument::getPage(size_t pageIndex) const {
514 SkASSERT(pageIndex < fPageRefs.size());
515 return fPageRefs[pageIndex];
516}
517
518const SkMatrix& SkPDFDocument::currentPageTransform() const {
519 return fPageDevice->initialTransform();
520}
521
522int SkPDFDocument::getMarkIdForNodeId(int nodeId) {
523 return fTagTree.getMarkIdForNodeId(nodeId, SkToUInt(this->currentPageIndex()));
524}
525
526static std::vector<const SkPDFFont*> get_fonts(const SkPDFDocument& canon) {
527 std::vector<const SkPDFFont*> fonts;
528 fonts.reserve(canon.fFontMap.count());
529 // Sort so the output PDF is reproducible.
530 canon.fFontMap.foreach([&fonts](uint64_t, const SkPDFFont& font) { fonts.push_back(&font); });
531 std::sort(fonts.begin(), fonts.end(), [](const SkPDFFont* u, const SkPDFFont* v) {
532 return u->indirectReference().fValue < v->indirectReference().fValue;
533 });
534 return fonts;
535}
536
537void SkPDFDocument::onClose(SkWStream* stream) {
538 SkASSERT(fCanvas.imageInfo().dimensions().isZero());
539 if (fPages.empty()) {
540 this->waitForJobs();
541 return;
542 }
543 auto docCatalog = SkPDFMakeDict("Catalog");
544 if (fMetadata.fPDFA) {
545 SkASSERT(fXMP != SkPDFIndirectReference());
546 docCatalog->insertRef("Metadata", fXMP);
547 // Don't specify OutputIntents if we are not in PDF/A mode since
548 // no one has ever asked for this feature.
549 docCatalog->insertObject("OutputIntents", make_srgb_output_intents(this));
550 }
551
552 docCatalog->insertRef("Pages", generate_page_tree(this, std::move(fPages), fPageRefs));
553
554 if (!fNamedDestinations.empty()) {
555 docCatalog->insertRef("Dests", append_destinations(this, fNamedDestinations));
556 fNamedDestinations.clear();
557 }
558
559 // Handle tagged PDFs.
560 if (SkPDFIndirectReference root = fTagTree.makeStructTreeRoot(this)) {
561 // In the document catalog, indicate that this PDF is tagged.
562 auto markInfo = SkPDFMakeDict("MarkInfo");
563 markInfo->insertBool("Marked", true);
564 docCatalog->insertObject("MarkInfo", std::move(markInfo));
565 docCatalog->insertRef("StructTreeRoot", root);
566 }
567
568 auto docCatalogRef = this->emit(*docCatalog);
569
570 for (const SkPDFFont* f : get_fonts(*this)) {
571 f->emitSubset(this);
572 }
573
574 this->waitForJobs();
575 {
576 SkAutoMutexExclusive autoMutexAcquire(fMutex);
577 serialize_footer(fOffsetMap, this->getStream(), fInfoDict, docCatalogRef, fUUID);
578 }
579}
580
581void SkPDFDocument::incrementJobCount() { fJobCount++; }
582
583void SkPDFDocument::signalJobComplete() { fSemaphore.signal(); }
584
585void SkPDFDocument::waitForJobs() {
586 // fJobCount can increase while we wait.
587 while (fJobCount > 0) {
588 fSemaphore.wait();
589 --fJobCount;
590 }
591}
592
593///////////////////////////////////////////////////////////////////////////////
594
595void SkPDF::SetNodeId(SkCanvas* canvas, int nodeID) {
596 sk_sp<SkData> payload = SkData::MakeWithCopy(&nodeID, sizeof(nodeID));
597 const char* key = SkPDFGetNodeIdKey();
598 canvas->drawAnnotation({0, 0, 0, 0}, key, payload.get());
599}
600
601sk_sp<SkDocument> SkPDF::MakeDocument(SkWStream* stream, const SkPDF::Metadata& metadata) {
602 SkPDF::Metadata meta = metadata;
603 if (meta.fRasterDPI <= 0) {
604 meta.fRasterDPI = 72.0f;
605 }
606 if (meta.fEncodingQuality < 0) {
607 meta.fEncodingQuality = 0;
608 }
609 return stream ? sk_make_sp<SkPDFDocument>(stream, std::move(meta)) : nullptr;
610}
611