/src/skia/src/pdf/SkPDFDocument.cpp
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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 "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 |
26 | 0 | const char* SkPDFGetNodeIdKey() { |
27 | 0 | static constexpr char key[] = "PDF_Node_Key"; |
28 | 0 | return key; |
29 | 0 | } |
30 | | |
31 | 0 | static SkString ToValidUtf8String(const SkData& d) { |
32 | 0 | if (d.size() == 0) { |
33 | 0 | SkDEBUGFAIL("Not a valid string, data length is zero."); |
34 | 0 | return SkString(); |
35 | 0 | } |
36 | | |
37 | 0 | const char* c_str = static_cast<const char*>(d.data()); |
38 | 0 | if (c_str[d.size() - 1] != 0) { |
39 | 0 | SkDEBUGFAIL("Not a valid string, not null-terminated."); |
40 | 0 | return SkString(); |
41 | 0 | } |
42 | | |
43 | | // CountUTF8 returns -1 if there's an invalid UTF-8 byte sequence. |
44 | 0 | int valid_utf8_chars_count = SkUTF::CountUTF8(c_str, d.size() - 1); |
45 | 0 | if (valid_utf8_chars_count == -1) { |
46 | 0 | SkDEBUGFAIL("Not a valid UTF-8 string."); |
47 | 0 | return SkString(); |
48 | 0 | } |
49 | | |
50 | 0 | return SkString(c_str, d.size() - 1); |
51 | 0 | } |
52 | | |
53 | | //////////////////////////////////////////////////////////////////////////////// |
54 | | |
55 | 0 | void SkPDFOffsetMap::markStartOfDocument(const SkWStream* s) { fBaseOffset = s->bytesWritten(); } |
56 | | |
57 | 0 | static size_t difference(size_t minuend, size_t subtrahend) { |
58 | 0 | return SkASSERT(minuend >= subtrahend), minuend - subtrahend; |
59 | 0 | } |
60 | | |
61 | 0 | void SkPDFOffsetMap::markStartOfObject(int referenceNumber, const SkWStream* s) { |
62 | 0 | SkASSERT(referenceNumber > 0); |
63 | 0 | size_t index = SkToSizeT(referenceNumber - 1); |
64 | 0 | if (index >= fOffsets.size()) { |
65 | 0 | fOffsets.resize(index + 1); |
66 | 0 | } |
67 | 0 | fOffsets[index] = SkToInt(difference(s->bytesWritten(), fBaseOffset)); |
68 | 0 | } |
69 | | |
70 | 0 | int SkPDFOffsetMap::objectCount() const { |
71 | 0 | return SkToInt(fOffsets.size() + 1); // Include the special zeroth object in the count. |
72 | 0 | } |
73 | | |
74 | 0 | int SkPDFOffsetMap::emitCrossReferenceTable(SkWStream* s) const { |
75 | 0 | int xRefFileOffset = SkToInt(difference(s->bytesWritten(), fBaseOffset)); |
76 | 0 | s->writeText("xref\n0 "); |
77 | 0 | s->writeDecAsText(this->objectCount()); |
78 | 0 | s->writeText("\n0000000000 65535 f \n"); |
79 | 0 | for (int offset : fOffsets) { |
80 | 0 | SkASSERT(offset > 0); // Offset was set. |
81 | 0 | s->writeBigDecAsText(offset, 10); |
82 | 0 | s->writeText(" 00000 n \n"); |
83 | 0 | } |
84 | 0 | return xRefFileOffset; |
85 | 0 | } |
86 | | // |
87 | | //////////////////////////////////////////////////////////////////////////////// |
88 | | |
89 | | #define SKPDF_MAGIC "\xD3\xEB\xE9\xE1" |
90 | | #ifndef SK_BUILD_FOR_WIN |
91 | | static_assert((SKPDF_MAGIC[0] & 0x7F) == "Skia"[0], ""); |
92 | | static_assert((SKPDF_MAGIC[1] & 0x7F) == "Skia"[1], ""); |
93 | | static_assert((SKPDF_MAGIC[2] & 0x7F) == "Skia"[2], ""); |
94 | | static_assert((SKPDF_MAGIC[3] & 0x7F) == "Skia"[3], ""); |
95 | | #endif |
96 | 0 | static void serializeHeader(SkPDFOffsetMap* offsetMap, SkWStream* wStream) { |
97 | 0 | offsetMap->markStartOfDocument(wStream); |
98 | 0 | 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 | 0 | } |
103 | | #undef SKPDF_MAGIC |
104 | | |
105 | | static void begin_indirect_object(SkPDFOffsetMap* offsetMap, |
106 | | SkPDFIndirectReference ref, |
107 | 0 | SkWStream* s) { |
108 | 0 | offsetMap->markStartOfObject(ref.fValue, s); |
109 | 0 | s->writeDecAsText(ref.fValue); |
110 | 0 | s->writeText(" 0 obj\n"); // Generation number is always 0. |
111 | 0 | } |
112 | | |
113 | 0 | static void end_indirect_object(SkWStream* s) { s->writeText("\nendobj\n"); } |
114 | | |
115 | | // Xref table and footer |
116 | | static void serialize_footer(const SkPDFOffsetMap& offsetMap, |
117 | | SkWStream* wStream, |
118 | | SkPDFIndirectReference infoDict, |
119 | | SkPDFIndirectReference docCatalog, |
120 | 0 | SkUUID uuid) { |
121 | 0 | int xRefFileOffset = offsetMap.emitCrossReferenceTable(wStream); |
122 | 0 | SkPDFDict trailerDict; |
123 | 0 | trailerDict.insertInt("Size", offsetMap.objectCount()); |
124 | 0 | SkASSERT(docCatalog != SkPDFIndirectReference()); |
125 | 0 | trailerDict.insertRef("Root", docCatalog); |
126 | 0 | SkASSERT(infoDict != SkPDFIndirectReference()); |
127 | 0 | trailerDict.insertRef("Info", infoDict); |
128 | 0 | if (SkUUID() != uuid) { |
129 | 0 | trailerDict.insertObject("ID", SkPDFMetadata::MakePdfId(uuid, uuid)); |
130 | 0 | } |
131 | 0 | wStream->writeText("trailer\n"); |
132 | 0 | trailerDict.emitObject(wStream); |
133 | 0 | wStream->writeText("\nstartxref\n"); |
134 | 0 | wStream->writeBigDecAsText(xRefFileOffset); |
135 | 0 | wStream->writeText("\n%%EOF"); |
136 | 0 | } |
137 | | |
138 | | static SkPDFIndirectReference generate_page_tree( |
139 | | SkPDFDocument* doc, |
140 | | std::vector<std::unique_ptr<SkPDFDict>> pages, |
141 | 0 | 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 | 0 | SkASSERT(pages.size() > 0); |
150 | 0 | struct PageTreeNode { |
151 | 0 | std::unique_ptr<SkPDFDict> fNode; |
152 | 0 | SkPDFIndirectReference fReservedRef; |
153 | 0 | int fPageObjectDescendantCount; |
154 | |
|
155 | 0 | static std::vector<PageTreeNode> Layer(std::vector<PageTreeNode> vec, SkPDFDocument* doc) { |
156 | 0 | std::vector<PageTreeNode> result; |
157 | 0 | static constexpr size_t kMaxNodeSize = 8; |
158 | 0 | const size_t n = vec.size(); |
159 | 0 | SkASSERT(n >= 1); |
160 | 0 | const size_t result_len = (n - 1) / kMaxNodeSize + 1; |
161 | 0 | SkASSERT(result_len >= 1); |
162 | 0 | SkASSERT(n == 1 || result_len < n); |
163 | 0 | result.reserve(result_len); |
164 | 0 | size_t index = 0; |
165 | 0 | for (size_t i = 0; i < result_len; ++i) { |
166 | 0 | if (n != 1 && index + 1 == n) { // No need to create a new node. |
167 | 0 | result.push_back(std::move(vec[index++])); |
168 | 0 | continue; |
169 | 0 | } |
170 | 0 | SkPDFIndirectReference parent = doc->reserveRef(); |
171 | 0 | auto kids_list = SkPDFMakeArray(); |
172 | 0 | int descendantCount = 0; |
173 | 0 | for (size_t j = 0; j < kMaxNodeSize && index < n; ++j) { |
174 | 0 | PageTreeNode& node = vec[index++]; |
175 | 0 | node.fNode->insertRef("Parent", parent); |
176 | 0 | kids_list->appendRef(doc->emit(*node.fNode, node.fReservedRef)); |
177 | 0 | descendantCount += node.fPageObjectDescendantCount; |
178 | 0 | } |
179 | 0 | auto next = SkPDFMakeDict("Pages"); |
180 | 0 | next->insertInt("Count", descendantCount); |
181 | 0 | next->insertObject("Kids", std::move(kids_list)); |
182 | 0 | result.push_back(PageTreeNode{std::move(next), parent, descendantCount}); |
183 | 0 | } |
184 | 0 | return result; |
185 | 0 | } |
186 | 0 | }; |
187 | 0 | std::vector<PageTreeNode> currentLayer; |
188 | 0 | currentLayer.reserve(pages.size()); |
189 | 0 | SkASSERT(pages.size() == pageRefs.size()); |
190 | 0 | for (size_t i = 0; i < pages.size(); ++i) { |
191 | 0 | currentLayer.push_back(PageTreeNode{std::move(pages[i]), pageRefs[i], 1}); |
192 | 0 | } |
193 | 0 | currentLayer = PageTreeNode::Layer(std::move(currentLayer), doc); |
194 | 0 | while (currentLayer.size() > 1) { |
195 | 0 | currentLayer = PageTreeNode::Layer(std::move(currentLayer), doc); |
196 | 0 | } |
197 | 0 | SkASSERT(currentLayer.size() == 1); |
198 | 0 | const PageTreeNode& root = currentLayer[0]; |
199 | 0 | return doc->emit(*root.fNode, root.fReservedRef); |
200 | 0 | } |
201 | | |
202 | | template<typename T, typename... Args> |
203 | 0 | static void reset_object(T* dst, Args&&... args) { |
204 | 0 | dst->~T(); |
205 | 0 | new (dst) T(std::forward<Args>(args)...); |
206 | 0 | } Unexecuted instantiation: SkPDFDocument.cpp:void reset_object<SkCanvas, sk_sp<SkPDFDevice>&>(SkCanvas*, sk_sp<SkPDFDevice>&) Unexecuted instantiation: SkPDFDocument.cpp:void reset_object<SkCanvas>(SkCanvas*) |
207 | | |
208 | | //////////////////////////////////////////////////////////////////////////////// |
209 | | |
210 | | SkPDFDocument::SkPDFDocument(SkWStream* stream, |
211 | | SkPDF::Metadata metadata) |
212 | | : SkDocument(stream) |
213 | 0 | , fMetadata(std::move(metadata)) { |
214 | 0 | constexpr float kDpiForRasterScaleOne = 72.0f; |
215 | 0 | if (fMetadata.fRasterDPI != kDpiForRasterScaleOne) { |
216 | 0 | fInverseRasterScale = kDpiForRasterScaleOne / fMetadata.fRasterDPI; |
217 | 0 | fRasterScale = fMetadata.fRasterDPI / kDpiForRasterScaleOne; |
218 | 0 | } |
219 | 0 | if (fMetadata.fStructureElementTreeRoot) { |
220 | 0 | fTagTree.init(fMetadata.fStructureElementTreeRoot); |
221 | 0 | } |
222 | 0 | fExecutor = metadata.fExecutor; |
223 | 0 | } |
224 | | |
225 | 0 | SkPDFDocument::~SkPDFDocument() { |
226 | | // subclasses of SkDocument must call close() in their destructors. |
227 | 0 | this->close(); |
228 | 0 | } |
229 | | |
230 | 0 | SkPDFIndirectReference SkPDFDocument::emit(const SkPDFObject& object, SkPDFIndirectReference ref){ |
231 | 0 | SkAutoMutexExclusive lock(fMutex); |
232 | 0 | object.emitObject(this->beginObject(ref)); |
233 | 0 | this->endObject(); |
234 | 0 | return ref; |
235 | 0 | } |
236 | | |
237 | 0 | SkWStream* SkPDFDocument::beginObject(SkPDFIndirectReference ref) SK_REQUIRES(fMutex) { |
238 | 0 | begin_indirect_object(&fOffsetMap, ref, this->getStream()); |
239 | 0 | return this->getStream(); |
240 | 0 | }; |
241 | | |
242 | 0 | void SkPDFDocument::endObject() SK_REQUIRES(fMutex) { |
243 | 0 | end_indirect_object(this->getStream()); |
244 | 0 | }; |
245 | | |
246 | 0 | static SkSize operator*(SkISize u, SkScalar s) { return SkSize{u.width() * s, u.height() * s}; } |
247 | 0 | static SkSize operator*(SkSize u, SkScalar s) { return SkSize{u.width() * s, u.height() * s}; } |
248 | | |
249 | 0 | SkCanvas* SkPDFDocument::onBeginPage(SkScalar width, SkScalar height) { |
250 | 0 | SkASSERT(fCanvas.imageInfo().dimensions().isZero()); |
251 | 0 | if (fPages.empty()) { |
252 | | // if this is the first page if the document. |
253 | 0 | { |
254 | 0 | SkAutoMutexExclusive autoMutexAcquire(fMutex); |
255 | 0 | serializeHeader(&fOffsetMap, this->getStream()); |
256 | |
|
257 | 0 | } |
258 | |
|
259 | 0 | fInfoDict = this->emit(*SkPDFMetadata::MakeDocumentInformationDict(fMetadata)); |
260 | 0 | if (fMetadata.fPDFA) { |
261 | 0 | 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 | 0 | fXMP = SkPDFMetadata::MakeXMPObject(fMetadata, fUUID, fUUID, this); |
268 | 0 | } |
269 | 0 | } |
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 | 0 | SkISize pageSize = (SkSize{width, height} * fRasterScale).toRound(); |
275 | 0 | 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 | 0 | initialTransform.setScaleTranslate(fInverseRasterScale, -fInverseRasterScale, |
279 | 0 | 0, fInverseRasterScale * pageSize.height()); |
280 | 0 | fPageDevice = sk_make_sp<SkPDFDevice>(pageSize, this, initialTransform); |
281 | 0 | reset_object(&fCanvas, fPageDevice); |
282 | 0 | fCanvas.scale(fRasterScale, fRasterScale); |
283 | 0 | fPageRefs.push_back(this->reserveRef()); |
284 | 0 | return &fCanvas; |
285 | 0 | } |
286 | | |
287 | 0 | static void populate_link_annotation(SkPDFDict* annotation, const SkRect& r) { |
288 | 0 | annotation->insertName("Subtype", "Link"); |
289 | 0 | 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 | 0 | annotation->insertObject("Border", SkPDFMakeArray(0, 0, 0)); |
294 | 0 | annotation->insertObject("Rect", SkPDFMakeArray(r.fLeft, r.fTop, r.fRight, r.fBottom)); |
295 | 0 | } |
296 | | |
297 | | static SkPDFIndirectReference append_destinations( |
298 | | SkPDFDocument* doc, |
299 | | const std::vector<SkPDFNamedDestination>& namedDestinations) |
300 | 0 | { |
301 | 0 | SkPDFDict destinations; |
302 | 0 | for (const SkPDFNamedDestination& dest : namedDestinations) { |
303 | 0 | auto pdfDest = SkPDFMakeArray(); |
304 | 0 | pdfDest->reserve(5); |
305 | 0 | pdfDest->appendRef(dest.fPage); |
306 | 0 | pdfDest->appendName("XYZ"); |
307 | 0 | pdfDest->appendScalar(dest.fPoint.x()); |
308 | 0 | pdfDest->appendScalar(dest.fPoint.y()); |
309 | 0 | pdfDest->appendInt(0); // Leave zoom unchanged |
310 | 0 | destinations.insertObject(ToValidUtf8String(*dest.fName), std::move(pdfDest)); |
311 | 0 | } |
312 | 0 | return doc->emit(destinations); |
313 | 0 | } |
314 | | |
315 | 0 | std::unique_ptr<SkPDFArray> SkPDFDocument::getAnnotations() { |
316 | 0 | std::unique_ptr<SkPDFArray> array; |
317 | 0 | size_t count = fCurrentPageLinks.size(); |
318 | 0 | if (0 == count) { |
319 | 0 | return array; // is nullptr |
320 | 0 | } |
321 | 0 | array = SkPDFMakeArray(); |
322 | 0 | array->reserve(count); |
323 | 0 | for (const auto& link : fCurrentPageLinks) { |
324 | 0 | SkPDFDict annotation("Annot"); |
325 | 0 | populate_link_annotation(&annotation, link->fRect); |
326 | 0 | if (link->fType == SkPDFLink::Type::kUrl) { |
327 | 0 | std::unique_ptr<SkPDFDict> action = SkPDFMakeDict("Action"); |
328 | 0 | action->insertName("S", "URI"); |
329 | 0 | action->insertString("URI", ToValidUtf8String(*link->fData)); |
330 | 0 | annotation.insertObject("A", std::move(action)); |
331 | 0 | } else if (link->fType == SkPDFLink::Type::kNamedDestination) { |
332 | 0 | annotation.insertName("Dest", ToValidUtf8String(*link->fData)); |
333 | 0 | } else { |
334 | 0 | SkDEBUGFAIL("Unknown link type."); |
335 | 0 | } |
336 | |
|
337 | 0 | if (link->fNodeId) { |
338 | 0 | int structParentKey = createStructParentKeyForNodeId(link->fNodeId); |
339 | 0 | if (structParentKey != -1) { |
340 | 0 | annotation.insertInt("StructParent", structParentKey); |
341 | 0 | } |
342 | 0 | } |
343 | |
|
344 | 0 | SkPDFIndirectReference annotationRef = emit(annotation); |
345 | 0 | array->appendRef(annotationRef); |
346 | 0 | if (link->fNodeId) { |
347 | 0 | fTagTree.addNodeAnnotation(link->fNodeId, annotationRef, SkToUInt(this->currentPageIndex())); |
348 | 0 | } |
349 | 0 | } |
350 | 0 | return array; |
351 | 0 | } |
352 | | |
353 | 0 | void SkPDFDocument::onEndPage() { |
354 | 0 | SkASSERT(!fCanvas.imageInfo().dimensions().isZero()); |
355 | 0 | reset_object(&fCanvas); |
356 | 0 | SkASSERT(fPageDevice); |
357 | |
|
358 | 0 | auto page = SkPDFMakeDict("Page"); |
359 | |
|
360 | 0 | SkSize mediaSize = fPageDevice->imageInfo().dimensions() * fInverseRasterScale; |
361 | 0 | std::unique_ptr<SkStreamAsset> pageContent = fPageDevice->content(); |
362 | 0 | auto resourceDict = fPageDevice->makeResourceDict(); |
363 | 0 | SkASSERT(fPageRefs.size() > 0); |
364 | 0 | fPageDevice = nullptr; |
365 | |
|
366 | 0 | page->insertObject("Resources", std::move(resourceDict)); |
367 | 0 | page->insertObject("MediaBox", SkPDFUtils::RectToArray(SkRect::MakeSize(mediaSize))); |
368 | |
|
369 | 0 | if (std::unique_ptr<SkPDFArray> annotations = getAnnotations()) { |
370 | 0 | page->insertObject("Annots", std::move(annotations)); |
371 | 0 | fCurrentPageLinks.clear(); |
372 | 0 | } |
373 | |
|
374 | 0 | page->insertRef("Contents", SkPDFStreamOut(nullptr, std::move(pageContent), this)); |
375 | | // The StructParents unique identifier for each page is just its |
376 | | // 0-based page index. |
377 | 0 | page->insertInt("StructParents", SkToInt(this->currentPageIndex())); |
378 | 0 | fPages.emplace_back(std::move(page)); |
379 | 0 | } |
380 | | |
381 | 0 | void SkPDFDocument::onAbort() { |
382 | 0 | this->waitForJobs(); |
383 | 0 | } |
384 | | |
385 | 0 | static sk_sp<SkData> SkSrgbIcm() { |
386 | | // Source: http://www.argyllcms.com/icclibsrc.html |
387 | 0 | static const char kProfile[] = |
388 | 0 | "\0\0\14\214argl\2 \0\0mntrRGB XYZ \7\336\0\1\0\6\0\26\0\17\0:acspM" |
389 | 0 | "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" |
390 | 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" |
391 | 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" |
392 | 0 | "\0\1\354\0\0\0gdmnd\0\0\2T\0\0\0pdmdd\0\0\2\304\0\0\0\210tech\0\0\3" |
393 | 0 | "L\0\0\0\14vued\0\0\3X\0\0\0gview\0\0\3\300\0\0\0$lumi\0\0\3\344\0\0" |
394 | 0 | "\0\24meas\0\0\3\370\0\0\0$wtpt\0\0\4\34\0\0\0\24bkpt\0\0\0040\0\0\0" |
395 | 0 | "\24rXYZ\0\0\4D\0\0\0\24gXYZ\0\0\4X\0\0\0\24bXYZ\0\0\4l\0\0\0\24rTR" |
396 | 0 | "C\0\0\4\200\0\0\10\14gTRC\0\0\4\200\0\0\10\14bTRC\0\0\4\200\0\0\10" |
397 | 0 | "\14desc\0\0\0\0\0\0\0?sRGB IEC61966-2.1 (Equivalent to www.srgb.co" |
398 | 0 | "m 1998 HP profile)\0\0\0\0\0\0\0\0\0\0\0?sRGB IEC61966-2.1 (Equiva" |
399 | 0 | "lent to www.srgb.com 1998 HP profile)\0\0\0\0\0\0\0\0text\0\0\0\0C" |
400 | 0 | "reated by Graeme W. Gill. Released into the public domain. No Warr" |
401 | 0 | "anty, Use at your own risk.\0\0desc\0\0\0\0\0\0\0\26IEC http://www" |
402 | 0 | ".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" |
403 | 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" |
404 | 0 | "\0\0\0\0\0\0desc\0\0\0\0\0\0\0.IEC 61966-2.1 Default RGB colour sp" |
405 | 0 | "ace - sRGB\0\0\0\0\0\0\0\0\0\0\0.IEC 61966-2.1 Default RGB colour " |
406 | 0 | "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" |
407 | 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" |
408 | 0 | "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" |
409 | 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\0view\0\0\0\0" |
410 | 0 | "\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" |
411 | 0 | "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" |
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491 | 0 | "\214\363\31\363\247\3644\364\302\365P\365\336\366m\366\373\367\212" |
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494 | 0 | const size_t kProfileLength = 3212; |
495 | 0 | static_assert(kProfileLength == sizeof(kProfile) - 1, ""); |
496 | 0 | return SkData::MakeWithoutCopy(kProfile, kProfileLength); |
497 | 0 | } |
498 | | |
499 | 0 | static SkPDFIndirectReference make_srgb_color_profile(SkPDFDocument* doc) { |
500 | 0 | std::unique_ptr<SkPDFDict> dict = SkPDFMakeDict(); |
501 | 0 | dict->insertInt("N", 3); |
502 | 0 | dict->insertObject("Range", SkPDFMakeArray(0, 1, 0, 1, 0, 1)); |
503 | 0 | return SkPDFStreamOut(std::move(dict), SkMemoryStream::Make(SkSrgbIcm()), doc, true); |
504 | 0 | } |
505 | | |
506 | 0 | static std::unique_ptr<SkPDFArray> make_srgb_output_intents(SkPDFDocument* doc) { |
507 | | // sRGB is specified by HTML, CSS, and SVG. |
508 | 0 | auto outputIntent = SkPDFMakeDict("OutputIntent"); |
509 | 0 | outputIntent->insertName("S", "GTS_PDFA1"); |
510 | 0 | outputIntent->insertString("RegistryName", "http://www.color.org"); |
511 | 0 | outputIntent->insertString("OutputConditionIdentifier", |
512 | 0 | "Custom"); |
513 | 0 | outputIntent->insertString("Info","sRGB IEC61966-2.1"); |
514 | 0 | outputIntent->insertRef("DestOutputProfile", make_srgb_color_profile(doc)); |
515 | 0 | auto intentArray = SkPDFMakeArray(); |
516 | 0 | intentArray->appendObject(std::move(outputIntent)); |
517 | 0 | return intentArray; |
518 | 0 | } |
519 | | |
520 | 0 | SkPDFIndirectReference SkPDFDocument::getPage(size_t pageIndex) const { |
521 | 0 | SkASSERT(pageIndex < fPageRefs.size()); |
522 | 0 | return fPageRefs[pageIndex]; |
523 | 0 | } |
524 | | |
525 | 0 | const SkMatrix& SkPDFDocument::currentPageTransform() const { |
526 | 0 | return fPageDevice->initialTransform(); |
527 | 0 | } |
528 | | |
529 | 0 | int SkPDFDocument::createMarkIdForNodeId(int nodeId) { |
530 | 0 | return fTagTree.createMarkIdForNodeId(nodeId, SkToUInt(this->currentPageIndex())); |
531 | 0 | } |
532 | | |
533 | 0 | int SkPDFDocument::createStructParentKeyForNodeId(int nodeId) { |
534 | 0 | return fTagTree.createStructParentKeyForNodeId(nodeId, SkToUInt(this->currentPageIndex())); |
535 | 0 | } |
536 | | |
537 | 0 | static std::vector<const SkPDFFont*> get_fonts(const SkPDFDocument& canon) { |
538 | 0 | std::vector<const SkPDFFont*> fonts; |
539 | 0 | fonts.reserve(canon.fFontMap.count()); |
540 | | // Sort so the output PDF is reproducible. |
541 | 0 | for (const auto& [unused, font] : canon.fFontMap) { |
542 | 0 | fonts.push_back(&font); |
543 | 0 | } |
544 | 0 | std::sort(fonts.begin(), fonts.end(), [](const SkPDFFont* u, const SkPDFFont* v) { |
545 | 0 | return u->indirectReference().fValue < v->indirectReference().fValue; |
546 | 0 | }); |
547 | 0 | return fonts; |
548 | 0 | } |
549 | | |
550 | 0 | void SkPDFDocument::onClose(SkWStream* stream) { |
551 | 0 | SkASSERT(fCanvas.imageInfo().dimensions().isZero()); |
552 | 0 | if (fPages.empty()) { |
553 | 0 | this->waitForJobs(); |
554 | 0 | return; |
555 | 0 | } |
556 | 0 | auto docCatalog = SkPDFMakeDict("Catalog"); |
557 | 0 | if (fMetadata.fPDFA) { |
558 | 0 | SkASSERT(fXMP != SkPDFIndirectReference()); |
559 | 0 | docCatalog->insertRef("Metadata", fXMP); |
560 | | // Don't specify OutputIntents if we are not in PDF/A mode since |
561 | | // no one has ever asked for this feature. |
562 | 0 | docCatalog->insertObject("OutputIntents", make_srgb_output_intents(this)); |
563 | 0 | } |
564 | |
|
565 | 0 | docCatalog->insertRef("Pages", generate_page_tree(this, std::move(fPages), fPageRefs)); |
566 | |
|
567 | 0 | if (!fNamedDestinations.empty()) { |
568 | 0 | docCatalog->insertRef("Dests", append_destinations(this, fNamedDestinations)); |
569 | 0 | fNamedDestinations.clear(); |
570 | 0 | } |
571 | | |
572 | | // Handle tagged PDFs. |
573 | 0 | if (SkPDFIndirectReference root = fTagTree.makeStructTreeRoot(this)) { |
574 | | // In the document catalog, indicate that this PDF is tagged. |
575 | 0 | auto markInfo = SkPDFMakeDict("MarkInfo"); |
576 | 0 | markInfo->insertBool("Marked", true); |
577 | 0 | docCatalog->insertObject("MarkInfo", std::move(markInfo)); |
578 | 0 | docCatalog->insertRef("StructTreeRoot", root); |
579 | 0 | } |
580 | |
|
581 | 0 | auto docCatalogRef = this->emit(*docCatalog); |
582 | |
|
583 | 0 | for (const SkPDFFont* f : get_fonts(*this)) { |
584 | 0 | f->emitSubset(this); |
585 | 0 | } |
586 | |
|
587 | 0 | this->waitForJobs(); |
588 | 0 | { |
589 | 0 | SkAutoMutexExclusive autoMutexAcquire(fMutex); |
590 | 0 | serialize_footer(fOffsetMap, this->getStream(), fInfoDict, docCatalogRef, fUUID); |
591 | 0 | } |
592 | 0 | } |
593 | | |
594 | 0 | void SkPDFDocument::incrementJobCount() { fJobCount++; } |
595 | | |
596 | 0 | void SkPDFDocument::signalJobComplete() { fSemaphore.signal(); } |
597 | | |
598 | 0 | void SkPDFDocument::waitForJobs() { |
599 | | // fJobCount can increase while we wait. |
600 | 0 | while (fJobCount > 0) { |
601 | 0 | fSemaphore.wait(); |
602 | 0 | --fJobCount; |
603 | 0 | } |
604 | 0 | } |
605 | | |
606 | | /////////////////////////////////////////////////////////////////////////////// |
607 | | |
608 | 0 | void SkPDF::SetNodeId(SkCanvas* canvas, int nodeID) { |
609 | 0 | sk_sp<SkData> payload = SkData::MakeWithCopy(&nodeID, sizeof(nodeID)); |
610 | 0 | const char* key = SkPDFGetNodeIdKey(); |
611 | 0 | canvas->drawAnnotation({0, 0, 0, 0}, key, payload.get()); |
612 | 0 | } |
613 | | |
614 | 0 | sk_sp<SkDocument> SkPDF::MakeDocument(SkWStream* stream, const SkPDF::Metadata& metadata) { |
615 | 0 | SkPDF::Metadata meta = metadata; |
616 | 0 | if (meta.fRasterDPI <= 0) { |
617 | 0 | meta.fRasterDPI = 72.0f; |
618 | 0 | } |
619 | 0 | if (meta.fEncodingQuality < 0) { |
620 | 0 | meta.fEncodingQuality = 0; |
621 | 0 | } |
622 | 0 | return stream ? sk_make_sp<SkPDFDocument>(stream, std::move(meta)) : nullptr; |
623 | 0 | } |