SkPDFDocument.cpp File Reference

#include "include/docs/SkPDFDocument.h"
#include "src/pdf/SkPDFDocumentPriv.h"
#include "include/core/SkStream.h"
#include "include/private/base/SkTo.h"
#include "src/base/SkUTF.h"
#include "src/pdf/SkPDFDevice.h"
#include "src/pdf/SkPDFFont.h"
#include "src/pdf/SkPDFGradientShader.h"
#include "src/pdf/SkPDFGraphicState.h"
#include "src/pdf/SkPDFShader.h"
#include "src/pdf/SkPDFTag.h"
#include "src/pdf/SkPDFUtils.h"
#include <utility>

Go to the source code of this file.

Macros
#define	SKPDF_MAGIC   "\xD3\xEB\xE9\xE1"

Functions
const char *	SkPDFGetNodeIdKey ()
static SkString	ToValidUtf8String (const SkData &d)
static size_t	difference (size_t minuend, size_t subtrahend)
static void	serializeHeader (SkPDFOffsetMap *offsetMap, SkWStream *wStream)
static void	begin_indirect_object (SkPDFOffsetMap *offsetMap, SkPDFIndirectReference ref, SkWStream *s)
static void	end_indirect_object (SkWStream *s)
static void	serialize_footer (const SkPDFOffsetMap &offsetMap, SkWStream *wStream, SkPDFIndirectReference infoDict, SkPDFIndirectReference docCatalog, SkUUID uuid)
static SkPDFIndirectReference	generate_page_tree (SkPDFDocument *doc, std::vector< std::unique_ptr< SkPDFDict > > pages, const std::vector< SkPDFIndirectReference > &pageRefs)
template<typename T , typename... Args>
static void	reset_object (T *dst, Args &&... args)
static SkSize	operator* (SkISize u, SkScalar s)
static SkSize	operator* (SkSize u, SkScalar s)
static void	populate_link_annotation (SkPDFDict *annotation, const SkRect &r)
static SkPDFIndirectReference	append_destinations (SkPDFDocument *doc, const std::vector< SkPDFNamedDestination > &namedDestinations)
static sk_sp< SkData >	SkSrgbIcm ()
static SkPDFIndirectReference	make_srgb_color_profile (SkPDFDocument *doc)
static std::unique_ptr< SkPDFArray >	make_srgb_output_intents (SkPDFDocument *doc)
static std::vector< const SkPDFFont * >	get_fonts (const SkPDFDocument &canon)

Macro Definition Documentation

SKPDF_MAGIC

#define SKPDF_MAGIC   "\xD3\xEB\xE9\xE1"

Definition at line 89 of file SkPDFDocument.cpp.

Function Documentation

append_destinations()

static SkPDFIndirectReference append_destinations ( SkPDFDocument *  doc, const std::vector< SkPDFNamedDestination > &  namedDestinations  )

static

Definition at line 297 of file SkPDFDocument.cpp.

{
    SkPDFDict destinations;
    for (const SkPDFNamedDestination& dest : namedDestinations) {
        auto pdfDest = SkPDFMakeArray();
        pdfDest->reserve(5);
        pdfDest->appendRef(dest.fPage);
        pdfDest->appendName("XYZ");
        pdfDest->appendScalar(dest.fPoint.x());
        pdfDest->appendScalar(dest.fPoint.y());
        pdfDest->appendInt(0);  // Leave zoom unchanged
        destinations.insertObject(ToValidUtf8String(*dest.fName), std::move(pdfDest));
    }
    return doc->emit(destinations);
}

begin_indirect_object()

static void begin_indirect_object ( SkPDFOffsetMap *  offsetMap, SkPDFIndirectReference  ref, SkWStream *  s  )

static

Definition at line 105 of file SkPDFDocument.cpp.

                                                {
    offsetMap->markStartOfObject(ref.fValue, s);
    s->writeDecAsText(ref.fValue);
    s->writeText(" 0 obj\n");  // Generation number is always 0.
}

difference()

static size_t difference ( size_t  minuend, size_t  subtrahend  )

static

Definition at line 57 of file SkPDFDocument.cpp.

                                                            {
    return SkASSERT(minuend >= subtrahend), minuend - subtrahend;
}

end_indirect_object()

static void end_indirect_object ( SkWStream *  s )

static

Definition at line 113 of file SkPDFDocument.cpp.

{ s->writeText("\nendobj\n"); }

generate_page_tree()

static SkPDFIndirectReference generate_page_tree ( SkPDFDocument *  doc, std::vector< std::unique_ptr< SkPDFDict > >  pages, const std::vector< SkPDFIndirectReference > &  pageRefs  )

static

Definition at line 138 of file SkPDFDocument.cpp.

                                                           {
    // PDF wants a tree describing all the pages in the document.  We arbitrary
    // choose 8 (kNodeSize) as the number of allowed children.  The internal
    // nodes have type "Pages" with an array of children, a parent pointer, and
    // the number of leaves below the node as "Count."  The leaves are passed
    // into the method, have type "Page" and need a parent pointer. This method
    // builds the tree bottom up, skipping internal nodes that would have only
    // one child.
    SkASSERT(!pages.empty());
    struct PageTreeNode {
        std::unique_ptr<SkPDFDict> fNode;
        SkPDFIndirectReference fReservedRef;
        int fPageObjectDescendantCount;
 
        static std::vector<PageTreeNode> Layer(std::vector<PageTreeNode> vec, SkPDFDocument* doc) {
            std::vector<PageTreeNode> result;
            static constexpr size_t kMaxNodeSize = 8;
            const size_t n = vec.size();
            SkASSERT(n >= 1);
            const size_t result_len = (n - 1) / kMaxNodeSize + 1;
            SkASSERT(result_len >= 1);
            SkASSERT(n == 1 || result_len < n);
            result.reserve(result_len);
            size_t index = 0;
            for (size_t i = 0; i < result_len; ++i) {
                if (n != 1 && index + 1 == n) {  // No need to create a new node.
                    result.push_back(std::move(vec[index++]));
                    continue;
                }
                SkPDFIndirectReference parent = doc->reserveRef();
                auto kids_list = SkPDFMakeArray();
                int descendantCount = 0;
                for (size_t j = 0; j < kMaxNodeSize && index < n; ++j) {
                    PageTreeNode& node = vec[index++];
                    node.fNode->insertRef("Parent", parent);
                    kids_list->appendRef(doc->emit(*node.fNode, node.fReservedRef));
                    descendantCount += node.fPageObjectDescendantCount;
                }
                auto next = SkPDFMakeDict("Pages");
                next->insertInt("Count", descendantCount);
                next->insertObject("Kids", std::move(kids_list));
                result.push_back(PageTreeNode{std::move(next), parent, descendantCount});
            }
            return result;
        }
    };
    std::vector<PageTreeNode> currentLayer;
    currentLayer.reserve(pages.size());
    SkASSERT(pages.size() == pageRefs.size());
    for (size_t i = 0; i < pages.size(); ++i) {
        currentLayer.push_back(PageTreeNode{std::move(pages[i]), pageRefs[i], 1});
    }
    currentLayer = PageTreeNode::Layer(std::move(currentLayer), doc);
    while (currentLayer.size() > 1) {
        currentLayer = PageTreeNode::Layer(std::move(currentLayer), doc);
    }
    SkASSERT(currentLayer.size() == 1);
    const PageTreeNode& root = currentLayer[0];
    return doc->emit(*root.fNode, root.fReservedRef);
}

get_fonts()

static std::vector< const SkPDFFont * > get_fonts ( const SkPDFDocument &  canon )

static

Definition at line 556 of file SkPDFDocument.cpp.

                                                                         {
    std::vector<const SkPDFFont*> fonts;
    fonts.reserve(canon.fFontMap.count());
    // Sort so the output PDF is reproducible.
    for (const auto& [unused, font] : canon.fFontMap) {
        fonts.push_back(&font);
    }
    std::sort(fonts.begin(), fonts.end(), [](const SkPDFFont* u, const SkPDFFont* v) {
        return u->indirectReference().fValue < v->indirectReference().fValue;
    });
    return fonts;
}

make_srgb_color_profile()

static SkPDFIndirectReference make_srgb_color_profile ( SkPDFDocument *  doc )

static

Definition at line 500 of file SkPDFDocument.cpp.

                                                                          {
    std::unique_ptr<SkPDFDict> dict = SkPDFMakeDict();
    dict->insertInt("N", 3);
    dict->insertObject("Range", SkPDFMakeArray(0, 1, 0, 1, 0, 1));
    return SkPDFStreamOut(std::move(dict), SkMemoryStream::Make(SkSrgbIcm()),
                          doc, SkPDFSteamCompressionEnabled::Yes);
}

make_srgb_output_intents()

static std::unique_ptr< SkPDFArray > make_srgb_output_intents ( SkPDFDocument *  doc )

static

Definition at line 508 of file SkPDFDocument.cpp.

                                                                              {
    // sRGB is specified by HTML, CSS, and SVG.
    auto outputIntent = SkPDFMakeDict("OutputIntent");
    outputIntent->insertName("S", "GTS_PDFA1");
    outputIntent->insertTextString("RegistryName", "http://www.color.org");
    outputIntent->insertTextString("OutputConditionIdentifier", "Custom");
    outputIntent->insertTextString("Info", "sRGB IEC61966-2.1");
    outputIntent->insertRef("DestOutputProfile", make_srgb_color_profile(doc));
    auto intentArray = SkPDFMakeArray();
    intentArray->appendObject(std::move(outputIntent));
    return intentArray;
}

operator*() [1/2]

static SkSize operator* ( SkISize  u, SkScalar  s  )

static

Definition at line 246 of file SkPDFDocument.cpp.

{ return SkSize{u.width() * s, u.height() * s}; }

operator*() [2/2]

static SkSize operator* ( SkSize  u, SkScalar  s  )

static

Definition at line 247 of file SkPDFDocument.cpp.

{ return SkSize{u.width() * s, u.height() * s}; }

populate_link_annotation()

static void populate_link_annotation ( SkPDFDict *  annotation, const SkRect &  r  )

static

Definition at line 287 of file SkPDFDocument.cpp.

                                                                             {
    annotation->insertName("Subtype", "Link");
    annotation->insertInt("F", 4);  // required by ISO 19005
    // Border: 0 = Horizontal corner radius.
    //         0 = Vertical corner radius.
    //         0 = Width, 0 = no border.
    annotation->insertObject("Border", SkPDFMakeArray(0, 0, 0));
    annotation->insertObject("Rect", SkPDFMakeArray(r.fLeft, r.fTop, r.fRight, r.fBottom));
}

reset_object()

template<typename T , typename... Args>

static void reset_object ( T *  dst, Args &&...  args  )

static

Definition at line 203 of file SkPDFDocument.cpp.

                                                 {
    dst->~T();
    new (dst) T(std::forward<Args>(args)...);
}

serialize_footer()

static void serialize_footer ( const SkPDFOffsetMap &  offsetMap, SkWStream *  wStream, SkPDFIndirectReference  infoDict, SkPDFIndirectReference  docCatalog, SkUUID  uuid  )

static

Definition at line 116 of file SkPDFDocument.cpp.

                                          {
    int xRefFileOffset = offsetMap.emitCrossReferenceTable(wStream);
    SkPDFDict trailerDict;
    trailerDict.insertInt("Size", offsetMap.objectCount());
    SkASSERT(docCatalog != SkPDFIndirectReference());
    trailerDict.insertRef("Root", docCatalog);
    SkASSERT(infoDict != SkPDFIndirectReference());
    trailerDict.insertRef("Info", infoDict);
    if (SkUUID() != uuid) {
        trailerDict.insertObject("ID", SkPDFMetadata::MakePdfId(uuid, uuid));
    }
    wStream->writeText("trailer\n");
    trailerDict.emitObject(wStream);
    wStream->writeText("\nstartxref\n");
    wStream->writeBigDecAsText(xRefFileOffset);
    wStream->writeText("\n%%EOF\n");
}

serializeHeader()

static void serializeHeader ( SkPDFOffsetMap *  offsetMap, SkWStream *  wStream  )

static

Definition at line 96 of file SkPDFDocument.cpp.

                                                                           {
    offsetMap->markStartOfDocument(wStream);
    wStream->writeText("%PDF-1.4\n%" SKPDF_MAGIC "\n");
    // The PDF spec recommends including a comment with four
    // bytes, all with their high bits set.  "\xD3\xEB\xE9\xE1" is
    // "Skia" with the high bits set.
}

SkPDFGetNodeIdKey()

const char * SkPDFGetNodeIdKey

(

)

Definition at line 26 of file SkPDFDocument.cpp.

                                {
    static constexpr char key[] = "PDF_Node_Key";
    return key;
}

SkSrgbIcm()

static sk_sp< SkData > SkSrgbIcm ( )

static

Definition at line 386 of file SkPDFDocument.cpp.

                                 {
    // Source: http://www.argyllcms.com/icclibsrc.html
    static const char kProfile[] =
        "\0\0\14\214argl\2 \0\0mntrRGB XYZ \7\336\0\1\0\6\0\26\0\17\0:acspM"
        "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"
        "\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"
        "\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"
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        "\0\24meas\0\0\3\370\0\0\0$wtpt\0\0\4\34\0\0\0\24bkpt\0\0\0040\0\0\0"
        "\24rXYZ\0\0\4D\0\0\0\24gXYZ\0\0\4X\0\0\0\24bXYZ\0\0\4l\0\0\0\24rTR"
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        "\14desc\0\0\0\0\0\0\0?sRGB IEC61966-2.1 (Equivalent to www.srgb.co"
        "m 1998 HP profile)\0\0\0\0\0\0\0\0\0\0\0?sRGB IEC61966-2.1 (Equiva"
        "lent to www.srgb.com 1998 HP profile)\0\0\0\0\0\0\0\0text\0\0\0\0C"
        "reated by Graeme W. Gill. Released into the public domain. No Warr"
        "anty, Use at your own risk.\0\0desc\0\0\0\0\0\0\0\26IEC http://www"
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        "\0\0\0\0\0\0desc\0\0\0\0\0\0\0.IEC 61966-2.1 Default RGB colour sp"
        "ace - sRGB\0\0\0\0\0\0\0\0\0\0\0.IEC 61966-2.1 Default RGB colour "
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        "\2264\226\237\227\n\227u\227\340\230L\230\270\231$\231\220\231\374"
        "\232h\232\325\233B\233\257\234\34\234\211\234\367\235d\235\322\236"
        "@\236\256\237\35\237\213\237\372\240i\240\330\241G\241\266\242&\242"
        "\226\243\6\243v\243\346\244V\244\307\2458\245\251\246\32\246\213\246"
        "\375\247n\247\340\250R\250\304\2517\251\251\252\34\252\217\253\2\253"
        "u\253\351\254\\\254\320\255D\255\270\256-\256\241\257\26\257\213\260"
        "\0\260u\260\352\261`\261\326\262K\262\302\2638\263\256\264%\264\234"
        "\265\23\265\212\266\1\266y\266\360\267h\267\340\270Y\270\321\271J\271"
        "\302\272;\272\265\273.\273\247\274!\274\233\275\25\275\217\276\n\276"
        "\204\276\377\277z\277\365\300p\300\354\301g\301\343\302_\302\333\303"
        "X\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\5\334\212\335\20"
        "\335\226\336\34\336\242\337)\337\257\3406\340\275\341D\341\314\342"
        "S\342\333\343c\343\353\344s\344\374\345\204\346\r\346\226\347\37\347"
        "\251\3502\350\274\351F\351\320\352[\352\345\353p\353\373\354\206\355"
        "\21\355\234\356(\356\264\357@\357\314\360X\360\345\361r\361\377\362"
        "\214\363\31\363\247\3644\364\302\365P\365\336\366m\366\373\367\212"
        "\370\31\370\250\3718\371\307\372W\372\347\373w\374\7\374\230\375)\375"
        "\272\376K\376\334\377m\377\377";
    const size_t kProfileLength = 3212;
    static_assert(kProfileLength == sizeof(kProfile) - 1, "");
    return SkData::MakeWithoutCopy(kProfile, kProfileLength);
}

ToValidUtf8String()

static SkString ToValidUtf8String ( const SkData &  d )

static

Definition at line 31 of file SkPDFDocument.cpp.

                                                   {
    if (d.size() == 0) {
        SkDEBUGFAIL("Not a valid string, data length is zero.");
        return SkString();
    }
 
    const char* c_str = static_cast<const char*>(d.data());
    if (c_str[d.size() - 1] != 0) {
        SkDEBUGFAIL("Not a valid string, not null-terminated.");
        return SkString();
    }
 
    // CountUTF8 returns -1 if there's an invalid UTF-8 byte sequence.
    int valid_utf8_chars_count = SkUTF::CountUTF8(c_str, d.size() - 1);
    if (valid_utf8_chars_count == -1) {
        SkDEBUGFAIL("Not a valid UTF-8 string.");
        return SkString();
    }
 
    return SkString(c_str, d.size() - 1);
}