SkPDF Fix PDF/A to be more valid

src/pdf/SkPDFDocument.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPDFCanon.h"
 #include "SkPDFCanvas.h"
 #include "SkPDFDevice.h"
@@ skipping 282 matching lines @@
 
 void SkPDFDocument::setMetadata(const SkDocument::Attribute info[],
                                 int infoCount,
                                 const SkTime::DateTime* creationDate,
                                 const SkTime::DateTime* modifiedDate) {
     fMetadata.fInfo.reset(info, infoCount);
     fMetadata.fCreation.reset(clone(creationDate));
     fMetadata.fModified.reset(clone(modifiedDate));
 }
 
+#ifdef SK_PDF_GENERATE_PDFA
+static sk_sp<SkData> SkSrgbIcm() {
+    // Source: http://www.argyllcms.com/icclibsrc.html
+    static const char kProfile[] =
+        "\000\000\014\214argl\002 \000\000mntrRGB XYZ \007\335\000\007\000\037"
+        "\000\023\000\020\000'acspMSFT\000\000\000\000IEC sRGB\000\000\000\000"
+        "\000\000\000\000\000\000\000\000\000\000\366\326\000\001\000\000\000"
+        "\000\323-argl\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
+        "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
+        "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\021"
+        "desc\000\000\001P\000\000\000\231cprt\000\000\001\354\000\000\000g"
+        "dmnd\000\000\002T\000\000\000pdmdd\000\000\002\304\000\000\000\210"
+        "tech\000\000\003L\000\000\000\014vued\000\000\003X\000\000\000gvie"
+        "w\000\000\003\300\000\000\000$lumi\000\000\003\344\000\000\000\024"
+        "meas\000\000\003\370\000\000\000$wtpt\000\000\004\034\000\000\000\024"
+        "bkpt\000\000\0040\000\000\000\024rXYZ\000\000\004D\000\000\000\024"
+        "gXYZ\000\000\004X\000\000\000\024bXYZ\000\000\004l\000\000\000\024"
+        "rTRC\000\000\004\200\000\000\010\014gTRC\000\000\004\200\000\000\010"
+        "\014bTRC\000\000\004\200\000\000\010\014desc\000\000\000\000\000\000"
+        "\000?sRGB IEC61966-2.1 (Equivalent to www.srgb.com 1998 HP profile"
+        ")\000\000\000\000\000\000\000\000\000\000\000?sRGB IEC61966-2.1 (E"
+        "quivalent to www.srgb.com 1998 HP profile)\000\000\000\000\000\000"
+        "\000\000text\000\000\000\000Created by Graeme W. Gill. Released in"
+        "to the public domain. No Warranty, Use at your own risk.\000\000de"
+        "sc\000\000\000\000\000\000\000\026IEC http://www.iec.ch\000\000\000"
+        "\000\000\000\000\000\000\000\000\026IEC http://www.iec.ch\000\000\000"
+        "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
+        "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
+        "\000\000\000\000\000\000\000\000\000desc\000\000\000\000\000\000\000"
+        ".IEC 61966-2.1 Default RGB colour space - sRGB\000\000\000\000\000"
+        "\000\000\000\000\000\000.IEC 61966-2.1 Default RGB colour space - "
+        "sRGB\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
+        "\000\000\000\000\000\000sig \000\000\000\000CRT desc\000\000\000\000"
+        "\000\000\000\rIEC61966-2.1\000\000\000\000\000\000\000\000\000\000"
+        "\000\rIEC61966-2.1\000\000\000\000\000\000\000\000\000\000\000\000"
+        "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
+        "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
+        "\000\000\000\000\000\000\000\000\000\000view\000\000\000\000\000\023"
+        "\244|\000\024_0\000\020\316\002\000\003\355\262\000\004\023\n\000\003"
+        "\\g\000\000\000\001XYZ \000\000\000\000\000L\n=\000P\000\000\000W\036"
+        "\270meas\000\000\000\000\000\000\000\001\000\000\000\000\000\000\000"
+        "\000\000\000\000\000\000\000\000\000\000\000\002\217\000\000\000\002"
+        "XYZ \000\000\000\000\000\000\363Q\000\001\000\000\000\001\026\314X"
+        "YZ \000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
+        "XYZ \000\000\000\000\000\000o\240\000\0008\365\000\000\003\220XYZ "
+        "\000\000\000\000\000\000b\227\000\000\267\207\000\000\030\331XYZ \000"
+        "\000\000\000\000\000$\237\000\000\017\204\000\000\266\303curv\000\000"
+        "\000\000\000\000\004\000\000\000\000\005\000\n\000\017\000\024\000"
+        "\031\000\036\000#\000(\000-\0002\0007\000;\000@\000E\000J\000O\000"
+        "T\000Y\000^\000c\000h\000m\000r\000w\000|\000\201\000\206\000\213\000"
+        "\220\000\225\000\232\000\237\000\244\000\251\000\256\000\262\000\267"
+        "\000\274\000\301\000\306\000\313\000\320\000\325\000\333\000\340\000"
+        "\345\000\353\000\360\000\366\000\373\001\001\001\007\001\r\001\023"
+        "\001\031\001\037\001%\001+\0012\0018\001>\001E\001L\001R\001Y\001`"
+        "\001g\001n\001u\001|\001\203\001\213\001\222\001\232\001\241\001\251"
+        "\001\261\001\271\001\301\001\311\001\321\001\331\001\341\001\351\001"
+        "\362\001\372\002\003\002\014\002\024\002\035\002&\002/\0028\002A\002"
+        "K\002T\002]\002g\002q\002z\002\204\002\216\002\230\002\242\002\254"
+        "\002\266\002\301\002\313\002\325\002\340\002\353\002\365\003\000\003"
+        "\013\003\026\003!\003-\0038\003C\003O\003Z\003f\003r\003~\003\212\003"
+        "\226\003\242\003\256\003\272\003\307\003\323\003\340\003\354\003\371"
+        "\004\006\004\023\004 \004-\004;\004H\004U\004c\004q\004~\004\214\004"
+        "\232\004\250\004\266\004\304\004\323\004\341\004\360\004\376\005\r"
+        "\005\034\005+\005:\005I\005X\005g\005w\005\206\005\226\005\246\005"
+        "\265\005\305\005\325\005\345\005\366\006\006\006\026\006'\0067\006"
+        "H\006Y\006j\006{\006\214\006\235\006\257\006\300\006\321\006\343\006"
+        "\365\007\007\007\031\007+\007=\007O\007a\007t\007\206\007\231\007\254"
+        "\007\277\007\322\007\345\007\370\010\013\010\037\0102\010F\010Z\010"
+        "n\010\202\010\226\010\252\010\276\010\322\010\347\010\373\t\020\t%"
+        "\t:\tO\td\ty\t\217\t\244\t\272\t\317\t\345\t\373\n\021\n'\n=\nT\nj"
+        "\n\201\n\230\n\256\n\305\n\334\n\363\013\013\013\"\0139\013Q\013i\013"
+        "\200\013\230\013\260\013\310\013\341\013\371\014\022\014*\014C\014"
+        "\\\014u\014\216\014\247\014\300\014\331\014\363\r\r\r&\r@\rZ\rt\r\216"
+        "\r\251\r\303\r\336\r\370\016\023\016.\016I\016d\016\177\016\233\016"
+        "\266\016\322\016\356\017\t\017%\017A\017^\017z\017\226\017\263\017"
+        "\317\017\354\020\t\020&\020C\020a\020~\020\233\020\271\020\327\020"
+        "\365\021\023\0211\021O\021m\021\214\021\252\021\311\021\350\022\007"
+        "\022&\022E\022d\022\204\022\243\022\303\022\343\023\003\023#\023C\023"
+        "c\023\203\023\244\023\305\023\345\024\006\024'\024I\024j\024\213\024"
+        "\255\024\316\024\360\025\022\0254\025V\025x\025\233\025\275\025\340"
+        "\026\003\026&\026I\026l\026\217\026\262\026\326\026\372\027\035\027"
+        "A\027e\027\211\027\256\027\322\027\367\030\033\030@\030e\030\212\030"
+        "\257\030\325\030\372\031 \031E\031k\031\221\031\267\031\335\032\004"
+        "\032*\032Q\032w\032\236\032\305\032\354\033\024\033;\033c\033\212\033"
+        "\262\033\332\034\002\034*\034R\034{\034\243\034\314\034\365\035\036"
+        "\035G\035p\035\231\035\303\035\354\036\026\036@\036j\036\224\036\276"
+        "\036\351\037\023\037>\037i\037\224\037\277\037\352 \025 A l \230 \304"
+        " \360!\034!H!u!\241!\316!\373\"'\"U\"\202\"\257\"\335#\n#8#f#\224#"
+        "\302#\360$\037$M$|$\253$\332%\t%8%h%\227%\307%\367&'&W&\207&\267&\350"
+        "'\030'I'z'\253'\334(\r(?(q(\242(\324)\006)8)k)\235)\320*\002*5*h*\233"
+        "*\317+\002+6+i+\235+\321,\005,9,n,\242,\327-\014-A-v-\253-\341.\026"
+        ".L.\202.\267.\356/$/Z/\221/\307/\376050l0\2440\3331\0221J1\2021\272"
+        "1\3622*2c2\2332\3243\r3F3\1773\2703\3614+4e4\2364\3305\0235M5\2075"
+        "\3025\375676r6\2566\3517$7`7\2347\3278\0248P8\2148\3109\0059B9\177"
+        "9\2749\371:6:t:\262:\357;-;k;\252;\350<'<e<\244<\343=\"=a=\241=\340"
+        "> >`>\240>\340?!?a?\242?\342@#@d@\246@\347A)AjA\254A\356B0BrB\265B"
+        "\367C:C}C\300D\003DGD\212D\316E\022EUE\232E\336F\"FgF\253F\360G5G{"
+        "G\300H\005HKH\221H\327I\035IcI\251I\360J7J}J\304K\014KSK\232K\342L"
+        "*LrL\272M\002MJM\223M\334N%NnN\267O\000OIO\223O\335P'PqP\273Q\006Q"
+        "PQ\233Q\346R1R|R\307S\023S_S\252S\366TBT\217T\333U(UuU\302V\017V\\"
+        "V\251V\367WDW\222W\340X/X}X\313Y\032YiY\270Z\007ZVZ\246Z\365[E[\225"
+        "[\345\\5\\\206\\\326]']x]\311^\032^l^\275_\017_a_\263`\005`W`\252`"
+        "\374aOa\242a\365bIb\234b\360cCc\227c\353d@d\224d\351e=e\222e\347f="
+        "f\222f\350g=g\223g\351h?h\226h\354iCi\232i\361jHj\237j\367kOk\247k"
+        "\377lWl\257m\010m`m\271n\022nkn\304o\036oxo\321p+p\206p\340q:q\225"
+        "q\360rKr\246s\001s]s\270t\024tpt\314u(u\205u\341v>v\233v\370wVw\263"
+        "x\021xnx\314y*y\211y\347zFz\245{\004{c{\302|!|\201|\341}A}\241~\001"
+        "~b~\302\177#\177\204\177\345\200G\200\250\201\n\201k\201\315\2020\202"
+        "\222\202\364\203W\203\272\204\035\204\200\204\343\205G\205\253\206"
+        "\016\206r\206\327\207;\207\237\210\004\210i\210\316\2113\211\231\211"
+        "\376\212d\212\312\2130\213\226\213\374\214c\214\312\2151\215\230\215"
+        "\377\216f\216\316\2176\217\236\220\006\220n\220\326\221?\221\250\222"
+        "\021\222z\222\343\223M\223\266\224 \224\212\224\364\225_\225\311\226"
+        "4\226\237\227\n\227u\227\340\230L\230\270\231$\231\220\231\374\232"
+        "h\232\325\233B\233\257\234\034\234\211\234\367\235d\235\322\236@\236"
+        "\256\237\035\237\213\237\372\240i\240\330\241G\241\266\242&\242\226"
+        "\243\006\243v\243\346\244V\244\307\2458\245\251\246\032\246\213\246"
+        "\375\247n\247\340\250R\250\304\2517\251\251\252\034\252\217\253\002"
+        "\253u\253\351\254\\\254\320\255D\255\270\256-\256\241\257\026\257\213"
+        "\260\000\260u\260\352\261`\261\326\262K\262\302\2638\263\256\264%\264"
+        "\234\265\023\265\212\266\001\266y\266\360\267h\267\340\270Y\270\321"
+        "\271J\271\302\272;\272\265\273.\273\247\274!\274\233\275\025\275\217"
+        "\276\n\276\204\276\377\277z\277\365\300p\300\354\301g\301\343\302_"
+        "\302\333\303X\303\324\304Q\304\316\305K\305\310\306F\306\303\307A\307"
+        "\277\310=\310\274\311:\311\271\3128\312\267\3136\313\266\3145\314\265"
+        "\3155\315\265\3166\316\266\3177\317\270\3209\320\272\321<\321\276\322"
+        "?\322\301\323D\323\306\324I\324\313\325N\325\321\326U\326\330\327\\"
+        "\327\340\330d\330\350\331l\331\361\332v\332\373\333\200\334\005\334"
+        "\212\335\020\335\226\336\034\336\242\337)\337\257\3406\340\275\341"
+        "D\341\314\342S\342\333\343c\343\353\344s\344\374\345\204\346\r\346"
+        "\226\347\037\347\251\3502\350\274\351F\351\320\352[\352\345\353p\353"
+        "\373\354\206\355\021\355\234\356(\356\264\357@\357\314\360X\360\345"
+        "\361r\361\377\362\214\363\031\363\247\3644\364\302\365P\365\336\366"
+        "m\366\373\367\212\370\031\370\250\3718\371\307\372W\372\347\373w\374"
+        "\007\374\230\375)\375\272\376K\376\334\377m\377\377";
+    return SkData::MakeWithoutCopy(kProfile, sizeof(kProfile) - 1);
+}
+
+static sk_sp<SkPDFStream> make_srgb_color_profile() {
+    sk_sp<SkData> profile = SkSrgbIcm();
+    sk_sp<SkPDFStream> stream = sk_make_sp<SkPDFStream>(profile.get());
+    stream->insertInt("N", 3);
+    sk_sp<SkPDFArray> array = sk_make_sp<SkPDFArray>();
+    array->appendScalar(0.0f);
+    array->appendScalar(1.0f);
+    array->appendScalar(0.0f);
+    array->appendScalar(1.0f);
+    array->appendScalar(0.0f);
+    array->appendScalar(1.0f);
+    stream->insertObject("Range", std::move(array));
+    return stream;
+}
+#endif  // SK_PDF_GENERATE_PDFA
+
 bool SkPDFDocument::onClose(SkWStream* stream) {
     SkASSERT(!fCanvas.get());
     if (fPages.empty()) {
         fPages.reset();
         fCanon.reset();
         renew(&fObjectSerializer);
         return false;
     }
     auto docCatalog = sk_make_sp<SkPDFDict>("Catalog");
     #ifdef SK_PDF_GENERATE_PDFA
         SkASSERT(fXMP);
         docCatalog->insertObjRef("Metadata", fXMP);
         // sRGB is specified by HTML, CSS, and SVG.
         auto outputIntent = sk_make_sp<SkPDFDict>("OutputIntent");
         outputIntent->insertName("S", "GTS_PDFA1");
         outputIntent->insertString("RegistryName", "http://www.color.org");
         outputIntent->insertString("OutputConditionIdentifier",
-                                   "sRGB IEC61966-2.1");
+                                   "Custom");
+        outputIntent->insertString("Info","sRGB IEC61966-2.1");
+        outputIntent->insertObjRef("DestOutputProfile",
+                                   make_srgb_color_profile());
         auto intentArray = sk_make_sp<SkPDFArray>();
         intentArray->appendObject(std::move(outputIntent));
         // Don't specify OutputIntents if we are not in PDF/A mode since
         // no one has ever asked for this feature.
         docCatalog->insertObject("OutputIntents", std::move(intentArray));
     #endif
     docCatalog->insertObjRef("Pages", generate_page_tree(&fPages));
 
     if (fDests->size() > 0) {
         docCatalog->insertObjRef("Dests", std::move(fDests));
@@ skipping 42 matching lines @@
     return SkPDFMakeDocument(stream, nullptr, dpi, jpegEncoder).release();
 }
 
 SkDocument* SkDocument::CreatePDF(const char path[], SkScalar dpi) {
     auto delete_wstream = [](SkWStream* stream, bool) { delete stream; };
     std::unique_ptr<SkFILEWStream> stream(new SkFILEWStream(path));
     return stream->isValid()
         ? SkPDFMakeDocument(stream.release(), delete_wstream, dpi, nullptr).release()
         : nullptr;
 }