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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 <ctype.h>
      9 
     10 #include "SkData.h"
     11 #include "SkFontHost.h"
     12 #include "SkGlyphCache.h"
     13 #include "SkPaint.h"
     14 #include "SkPDFCatalog.h"
     15 #include "SkPDFDevice.h"
     16 #include "SkPDFFont.h"
     17 #include "SkPDFFontImpl.h"
     18 #include "SkPDFStream.h"
     19 #include "SkPDFTypes.h"
     20 #include "SkPDFUtils.h"
     21 #include "SkRefCnt.h"
     22 #include "SkScalar.h"
     23 #include "SkStream.h"
     24 #include "SkTypefacePriv.h"
     25 #include "SkTypes.h"
     26 #include "SkUtils.h"
     27 
     28 #if defined (SK_SFNTLY_SUBSETTER)
     29 #include SK_SFNTLY_SUBSETTER
     30 #endif
     31 
     32 // PDF's notion of symbolic vs non-symbolic is related to the character set, not
     33 // symbols vs. characters.  Rarely is a font the right character set to call it
     34 // non-symbolic, so always call it symbolic.  (PDF 1.4 spec, section 5.7.1)
     35 static const int kPdfSymbolic = 4;
     36 
     37 namespace {
     38 
     39 ///////////////////////////////////////////////////////////////////////////////
     40 // File-Local Functions
     41 ///////////////////////////////////////////////////////////////////////////////
     42 
     43 bool parsePFBSection(const uint8_t** src, size_t* len, int sectionType,
     44                      size_t* size) {
     45     // PFB sections have a two or six bytes header. 0x80 and a one byte
     46     // section type followed by a four byte section length.  Type one is
     47     // an ASCII section (includes a length), type two is a binary section
     48     // (includes a length) and type three is an EOF marker with no length.
     49     const uint8_t* buf = *src;
     50     if (*len < 2 || buf[0] != 0x80 || buf[1] != sectionType) {
     51         return false;
     52     } else if (buf[1] == 3) {
     53         return true;
     54     } else if (*len < 6) {
     55         return false;
     56     }
     57 
     58     *size = (size_t)buf[2] | ((size_t)buf[3] << 8) | ((size_t)buf[4] << 16) |
     59             ((size_t)buf[5] << 24);
     60     size_t consumed = *size + 6;
     61     if (consumed > *len) {
     62         return false;
     63     }
     64     *src = *src + consumed;
     65     *len = *len - consumed;
     66     return true;
     67 }
     68 
     69 bool parsePFB(const uint8_t* src, size_t size, size_t* headerLen,
     70               size_t* dataLen, size_t* trailerLen) {
     71     const uint8_t* srcPtr = src;
     72     size_t remaining = size;
     73 
     74     return parsePFBSection(&srcPtr, &remaining, 1, headerLen) &&
     75            parsePFBSection(&srcPtr, &remaining, 2, dataLen) &&
     76            parsePFBSection(&srcPtr, &remaining, 1, trailerLen) &&
     77            parsePFBSection(&srcPtr, &remaining, 3, NULL);
     78 }
     79 
     80 /* The sections of a PFA file are implicitly defined.  The body starts
     81  * after the line containing "eexec," and the trailer starts with 512
     82  * literal 0's followed by "cleartomark" (plus arbitrary white space).
     83  *
     84  * This function assumes that src is NUL terminated, but the NUL
     85  * termination is not included in size.
     86  *
     87  */
     88 bool parsePFA(const char* src, size_t size, size_t* headerLen,
     89               size_t* hexDataLen, size_t* dataLen, size_t* trailerLen) {
     90     const char* end = src + size;
     91 
     92     const char* dataPos = strstr(src, "eexec");
     93     if (!dataPos) {
     94         return false;
     95     }
     96     dataPos += strlen("eexec");
     97     while ((*dataPos == '\n' || *dataPos == '\r' || *dataPos == ' ') &&
     98             dataPos < end) {
     99         dataPos++;
    100     }
    101     *headerLen = dataPos - src;
    102 
    103     const char* trailerPos = strstr(dataPos, "cleartomark");
    104     if (!trailerPos) {
    105         return false;
    106     }
    107     int zeroCount = 0;
    108     for (trailerPos--; trailerPos > dataPos && zeroCount < 512; trailerPos--) {
    109         if (*trailerPos == '\n' || *trailerPos == '\r' || *trailerPos == ' ') {
    110             continue;
    111         } else if (*trailerPos == '0') {
    112             zeroCount++;
    113         } else {
    114             return false;
    115         }
    116     }
    117     if (zeroCount != 512) {
    118         return false;
    119     }
    120 
    121     *hexDataLen = trailerPos - src - *headerLen;
    122     *trailerLen = size - *headerLen - *hexDataLen;
    123 
    124     // Verify that the data section is hex encoded and count the bytes.
    125     int nibbles = 0;
    126     for (; dataPos < trailerPos; dataPos++) {
    127         if (isspace(*dataPos)) {
    128             continue;
    129         }
    130         if (!isxdigit(*dataPos)) {
    131             return false;
    132         }
    133         nibbles++;
    134     }
    135     *dataLen = (nibbles + 1) / 2;
    136 
    137     return true;
    138 }
    139 
    140 int8_t hexToBin(uint8_t c) {
    141     if (!isxdigit(c)) {
    142         return -1;
    143     } else if (c <= '9') {
    144         return c - '0';
    145     } else if (c <= 'F') {
    146         return c - 'A' + 10;
    147     } else if (c <= 'f') {
    148         return c - 'a' + 10;
    149     }
    150     return -1;
    151 }
    152 
    153 SkStream* handleType1Stream(SkStream* srcStream, size_t* headerLen,
    154                             size_t* dataLen, size_t* trailerLen) {
    155     // srcStream may be backed by a file or a unseekable fd, so we may not be
    156     // able to use skip(), rewind(), or getMemoryBase().  read()ing through
    157     // the input only once is doable, but very ugly. Furthermore, it'd be nice
    158     // if the data was NUL terminated so that we can use strstr() to search it.
    159     // Make as few copies as possible given these constraints.
    160     SkDynamicMemoryWStream dynamicStream;
    161     SkAutoTUnref<SkMemoryStream> staticStream;
    162     SkData* data = NULL;
    163     const uint8_t* src;
    164     size_t srcLen;
    165     if ((srcLen = srcStream->getLength()) > 0) {
    166         staticStream.reset(new SkMemoryStream(srcLen + 1));
    167         src = (const uint8_t*)staticStream->getMemoryBase();
    168         if (srcStream->getMemoryBase() != NULL) {
    169             memcpy((void *)src, srcStream->getMemoryBase(), srcLen);
    170         } else {
    171             size_t read = 0;
    172             while (read < srcLen) {
    173                 size_t got = srcStream->read((void *)staticStream->getAtPos(),
    174                                              srcLen - read);
    175                 if (got == 0) {
    176                     return NULL;
    177                 }
    178                 read += got;
    179                 staticStream->seek(read);
    180             }
    181         }
    182         ((uint8_t *)src)[srcLen] = 0;
    183     } else {
    184         static const size_t kBufSize = 4096;
    185         uint8_t buf[kBufSize];
    186         size_t amount;
    187         while ((amount = srcStream->read(buf, kBufSize)) > 0) {
    188             dynamicStream.write(buf, amount);
    189         }
    190         amount = 0;
    191         dynamicStream.write(&amount, 1);  // NULL terminator.
    192         data = dynamicStream.copyToData();
    193         src = data->bytes();
    194         srcLen = data->size() - 1;
    195     }
    196 
    197     // this handles releasing the data we may have gotten from dynamicStream.
    198     // if data is null, it is a no-op
    199     SkAutoDataUnref aud(data);
    200 
    201     if (parsePFB(src, srcLen, headerLen, dataLen, trailerLen)) {
    202         SkMemoryStream* result =
    203             new SkMemoryStream(*headerLen + *dataLen + *trailerLen);
    204         memcpy((char*)result->getAtPos(), src + 6, *headerLen);
    205         result->seek(*headerLen);
    206         memcpy((char*)result->getAtPos(), src + 6 + *headerLen + 6, *dataLen);
    207         result->seek(*headerLen + *dataLen);
    208         memcpy((char*)result->getAtPos(), src + 6 + *headerLen + 6 + *dataLen,
    209                *trailerLen);
    210         result->rewind();
    211         return result;
    212     }
    213 
    214     // A PFA has to be converted for PDF.
    215     size_t hexDataLen;
    216     if (parsePFA((const char*)src, srcLen, headerLen, &hexDataLen, dataLen,
    217                  trailerLen)) {
    218         SkMemoryStream* result =
    219             new SkMemoryStream(*headerLen + *dataLen + *trailerLen);
    220         memcpy((char*)result->getAtPos(), src, *headerLen);
    221         result->seek(*headerLen);
    222 
    223         const uint8_t* hexData = src + *headerLen;
    224         const uint8_t* trailer = hexData + hexDataLen;
    225         size_t outputOffset = 0;
    226         uint8_t dataByte = 0;  // To hush compiler.
    227         bool highNibble = true;
    228         for (; hexData < trailer; hexData++) {
    229             int8_t curNibble = hexToBin(*hexData);
    230             if (curNibble < 0) {
    231                 continue;
    232             }
    233             if (highNibble) {
    234                 dataByte = curNibble << 4;
    235                 highNibble = false;
    236             } else {
    237                 dataByte |= curNibble;
    238                 highNibble = true;
    239                 ((char *)result->getAtPos())[outputOffset++] = dataByte;
    240             }
    241         }
    242         if (!highNibble) {
    243             ((char *)result->getAtPos())[outputOffset++] = dataByte;
    244         }
    245         SkASSERT(outputOffset == *dataLen);
    246         result->seek(*headerLen + outputOffset);
    247 
    248         memcpy((char *)result->getAtPos(), src + *headerLen + hexDataLen,
    249                *trailerLen);
    250         result->rewind();
    251         return result;
    252     }
    253 
    254     return NULL;
    255 }
    256 
    257 // scale from em-units to base-1000, returning as a SkScalar
    258 SkScalar scaleFromFontUnits(int16_t val, uint16_t emSize) {
    259     SkScalar scaled = SkIntToScalar(val);
    260     if (emSize == 1000) {
    261         return scaled;
    262     } else {
    263         return SkScalarMulDiv(scaled, 1000, emSize);
    264     }
    265 }
    266 
    267 void setGlyphWidthAndBoundingBox(SkScalar width, SkIRect box,
    268                                  SkWStream* content) {
    269     // Specify width and bounding box for the glyph.
    270     SkPDFScalar::Append(width, content);
    271     content->writeText(" 0 ");
    272     content->writeDecAsText(box.fLeft);
    273     content->writeText(" ");
    274     content->writeDecAsText(box.fTop);
    275     content->writeText(" ");
    276     content->writeDecAsText(box.fRight);
    277     content->writeText(" ");
    278     content->writeDecAsText(box.fBottom);
    279     content->writeText(" d1\n");
    280 }
    281 
    282 SkPDFArray* makeFontBBox(SkIRect glyphBBox, uint16_t emSize) {
    283     SkPDFArray* bbox = new SkPDFArray;
    284     bbox->reserve(4);
    285     bbox->appendScalar(scaleFromFontUnits(glyphBBox.fLeft, emSize));
    286     bbox->appendScalar(scaleFromFontUnits(glyphBBox.fBottom, emSize));
    287     bbox->appendScalar(scaleFromFontUnits(glyphBBox.fRight, emSize));
    288     bbox->appendScalar(scaleFromFontUnits(glyphBBox.fTop, emSize));
    289     return bbox;
    290 }
    291 
    292 SkPDFArray* appendWidth(const int16_t& width, uint16_t emSize,
    293                         SkPDFArray* array) {
    294     array->appendScalar(scaleFromFontUnits(width, emSize));
    295     return array;
    296 }
    297 
    298 SkPDFArray* appendVerticalAdvance(
    299         const SkAdvancedTypefaceMetrics::VerticalMetric& advance,
    300         uint16_t emSize, SkPDFArray* array) {
    301     appendWidth(advance.fVerticalAdvance, emSize, array);
    302     appendWidth(advance.fOriginXDisp, emSize, array);
    303     appendWidth(advance.fOriginYDisp, emSize, array);
    304     return array;
    305 }
    306 
    307 template <typename Data>
    308 SkPDFArray* composeAdvanceData(
    309         SkAdvancedTypefaceMetrics::AdvanceMetric<Data>* advanceInfo,
    310         uint16_t emSize,
    311         SkPDFArray* (*appendAdvance)(const Data& advance, uint16_t emSize,
    312                                      SkPDFArray* array),
    313         Data* defaultAdvance) {
    314     SkPDFArray* result = new SkPDFArray();
    315     for (; advanceInfo != NULL; advanceInfo = advanceInfo->fNext.get()) {
    316         switch (advanceInfo->fType) {
    317             case SkAdvancedTypefaceMetrics::WidthRange::kDefault: {
    318                 SkASSERT(advanceInfo->fAdvance.count() == 1);
    319                 *defaultAdvance = advanceInfo->fAdvance[0];
    320                 break;
    321             }
    322             case SkAdvancedTypefaceMetrics::WidthRange::kRange: {
    323                 SkAutoTUnref<SkPDFArray> advanceArray(new SkPDFArray());
    324                 for (int j = 0; j < advanceInfo->fAdvance.count(); j++)
    325                     appendAdvance(advanceInfo->fAdvance[j], emSize,
    326                                   advanceArray.get());
    327                 result->appendInt(advanceInfo->fStartId);
    328                 result->append(advanceArray.get());
    329                 break;
    330             }
    331             case SkAdvancedTypefaceMetrics::WidthRange::kRun: {
    332                 SkASSERT(advanceInfo->fAdvance.count() == 1);
    333                 result->appendInt(advanceInfo->fStartId);
    334                 result->appendInt(advanceInfo->fEndId);
    335                 appendAdvance(advanceInfo->fAdvance[0], emSize, result);
    336                 break;
    337             }
    338         }
    339     }
    340     return result;
    341 }
    342 
    343 }  // namespace
    344 
    345 static void append_tounicode_header(SkDynamicMemoryWStream* cmap) {
    346     // 12 dict begin: 12 is an Adobe-suggested value. Shall not change.
    347     // It's there to prevent old version Adobe Readers from malfunctioning.
    348     const char* kHeader =
    349         "/CIDInit /ProcSet findresource begin\n"
    350         "12 dict begin\n"
    351         "begincmap\n";
    352     cmap->writeText(kHeader);
    353 
    354     // The /CIDSystemInfo must be consistent to the one in
    355     // SkPDFFont::populateCIDFont().
    356     // We can not pass over the system info object here because the format is
    357     // different. This is not a reference object.
    358     const char* kSysInfo =
    359         "/CIDSystemInfo\n"
    360         "<<  /Registry (Adobe)\n"
    361         "/Ordering (UCS)\n"
    362         "/Supplement 0\n"
    363         ">> def\n";
    364     cmap->writeText(kSysInfo);
    365 
    366     // The CMapName must be consistent to /CIDSystemInfo above.
    367     // /CMapType 2 means ToUnicode.
    368     // We specify codespacerange from 0x0000 to 0xFFFF because we convert our
    369     // code table from unsigned short (16-bits). Codespace range just tells the
    370     // PDF processor the valid range. It does not matter whether a complete
    371     // mapping is provided or not.
    372     const char* kTypeInfo =
    373         "/CMapName /Adobe-Identity-UCS def\n"
    374         "/CMapType 2 def\n"
    375         "1 begincodespacerange\n"
    376         "<0000> <FFFF>\n"
    377         "endcodespacerange\n";
    378     cmap->writeText(kTypeInfo);
    379 }
    380 
    381 static void append_cmap_footer(SkDynamicMemoryWStream* cmap) {
    382     const char* kFooter =
    383         "endcmap\n"
    384         "CMapName currentdict /CMap defineresource pop\n"
    385         "end\n"
    386         "end";
    387     cmap->writeText(kFooter);
    388 }
    389 
    390 struct BFChar {
    391     uint16_t fGlyphId;
    392     SkUnichar fUnicode;
    393 };
    394 
    395 struct BFRange {
    396     uint16_t fStart;
    397     uint16_t fEnd;
    398     SkUnichar fUnicode;
    399 };
    400 
    401 static void append_bfchar_section(const SkTDArray<BFChar>& bfchar,
    402                                   SkDynamicMemoryWStream* cmap) {
    403     // PDF spec defines that every bf* list can have at most 100 entries.
    404     for (int i = 0; i < bfchar.count(); i += 100) {
    405         int count = bfchar.count() - i;
    406         count = SkMin32(count, 100);
    407         cmap->writeDecAsText(count);
    408         cmap->writeText(" beginbfchar\n");
    409         for (int j = 0; j < count; ++j) {
    410             cmap->writeText("<");
    411             cmap->writeHexAsText(bfchar[i + j].fGlyphId, 4);
    412             cmap->writeText("> <");
    413             cmap->writeHexAsText(bfchar[i + j].fUnicode, 4);
    414             cmap->writeText(">\n");
    415         }
    416         cmap->writeText("endbfchar\n");
    417     }
    418 }
    419 
    420 static void append_bfrange_section(const SkTDArray<BFRange>& bfrange,
    421                                    SkDynamicMemoryWStream* cmap) {
    422     // PDF spec defines that every bf* list can have at most 100 entries.
    423     for (int i = 0; i < bfrange.count(); i += 100) {
    424         int count = bfrange.count() - i;
    425         count = SkMin32(count, 100);
    426         cmap->writeDecAsText(count);
    427         cmap->writeText(" beginbfrange\n");
    428         for (int j = 0; j < count; ++j) {
    429             cmap->writeText("<");
    430             cmap->writeHexAsText(bfrange[i + j].fStart, 4);
    431             cmap->writeText("> <");
    432             cmap->writeHexAsText(bfrange[i + j].fEnd, 4);
    433             cmap->writeText("> <");
    434             cmap->writeHexAsText(bfrange[i + j].fUnicode, 4);
    435             cmap->writeText(">\n");
    436         }
    437         cmap->writeText("endbfrange\n");
    438     }
    439 }
    440 
    441 // Generate <bfchar> and <bfrange> table according to PDF spec 1.4 and Adobe
    442 // Technote 5014.
    443 // The function is not static so we can test it in unit tests.
    444 //
    445 // Current implementation guarantees bfchar and bfrange entries do not overlap.
    446 //
    447 // Current implementation does not attempt aggresive optimizations against
    448 // following case because the specification is not clear.
    449 //
    450 // 4 beginbfchar          1 beginbfchar
    451 // <0003> <0013>          <0020> <0014>
    452 // <0005> <0015>    to    endbfchar
    453 // <0007> <0017>          1 beginbfrange
    454 // <0020> <0014>          <0003> <0007> <0013>
    455 // endbfchar              endbfrange
    456 //
    457 // Adobe Technote 5014 said: "Code mappings (unlike codespace ranges) may
    458 // overlap, but succeeding maps superceded preceding maps."
    459 //
    460 // In case of searching text in PDF, bfrange will have higher precedence so
    461 // typing char id 0x0014 in search box will get glyph id 0x0004 first.  However,
    462 // the spec does not mention how will this kind of conflict being resolved.
    463 //
    464 // For the worst case (having 65536 continuous unicode and we use every other
    465 // one of them), the possible savings by aggressive optimization is 416KB
    466 // pre-compressed and does not provide enough motivation for implementation.
    467 
    468 // FIXME: this should be in a header so that it is separately testable
    469 // ( see caller in tests/ToUnicode.cpp )
    470 void append_cmap_sections(const SkTDArray<SkUnichar>& glyphToUnicode,
    471                           const SkPDFGlyphSet* subset,
    472                           SkDynamicMemoryWStream* cmap);
    473 
    474 void append_cmap_sections(const SkTDArray<SkUnichar>& glyphToUnicode,
    475                           const SkPDFGlyphSet* subset,
    476                           SkDynamicMemoryWStream* cmap) {
    477     if (glyphToUnicode.isEmpty()) {
    478         return;
    479     }
    480 
    481     SkTDArray<BFChar> bfcharEntries;
    482     SkTDArray<BFRange> bfrangeEntries;
    483 
    484     BFRange currentRangeEntry = {0, 0, 0};
    485     bool rangeEmpty = true;
    486     const int count = glyphToUnicode.count();
    487 
    488     for (int i = 0; i < count + 1; ++i) {
    489         bool inSubset = i < count && (subset == NULL || subset->has(i));
    490         if (!rangeEmpty) {
    491             // PDF spec requires bfrange not changing the higher byte,
    492             // e.g. <1035> <10FF> <2222> is ok, but
    493             //      <1035> <1100> <2222> is no good
    494             bool inRange =
    495                 i == currentRangeEntry.fEnd + 1 &&
    496                 i >> 8 == currentRangeEntry.fStart >> 8 &&
    497                 i < count &&
    498                 glyphToUnicode[i] == currentRangeEntry.fUnicode + i -
    499                                          currentRangeEntry.fStart;
    500             if (!inSubset || !inRange) {
    501                 if (currentRangeEntry.fEnd > currentRangeEntry.fStart) {
    502                     bfrangeEntries.push(currentRangeEntry);
    503                 } else {
    504                     BFChar* entry = bfcharEntries.append();
    505                     entry->fGlyphId = currentRangeEntry.fStart;
    506                     entry->fUnicode = currentRangeEntry.fUnicode;
    507                 }
    508                 rangeEmpty = true;
    509             }
    510         }
    511         if (inSubset) {
    512             currentRangeEntry.fEnd = i;
    513             if (rangeEmpty) {
    514               currentRangeEntry.fStart = i;
    515               currentRangeEntry.fUnicode = glyphToUnicode[i];
    516               rangeEmpty = false;
    517             }
    518         }
    519     }
    520 
    521     // The spec requires all bfchar entries for a font must come before bfrange
    522     // entries.
    523     append_bfchar_section(bfcharEntries, cmap);
    524     append_bfrange_section(bfrangeEntries, cmap);
    525 }
    526 
    527 static SkPDFStream* generate_tounicode_cmap(
    528         const SkTDArray<SkUnichar>& glyphToUnicode,
    529         const SkPDFGlyphSet* subset) {
    530     SkDynamicMemoryWStream cmap;
    531     append_tounicode_header(&cmap);
    532     append_cmap_sections(glyphToUnicode, subset, &cmap);
    533     append_cmap_footer(&cmap);
    534     SkAutoTUnref<SkMemoryStream> cmapStream(new SkMemoryStream());
    535     cmapStream->setData(cmap.copyToData())->unref();
    536     return new SkPDFStream(cmapStream.get());
    537 }
    538 
    539 #if defined (SK_SFNTLY_SUBSETTER)
    540 static void sk_delete_array(const void* ptr, size_t, void*) {
    541     // Use C-style cast to cast away const and cast type simultaneously.
    542     delete[] (unsigned char*)ptr;
    543 }
    544 #endif
    545 
    546 static int get_subset_font_stream(const char* fontName,
    547                                   const SkTypeface* typeface,
    548                                   const SkTDArray<uint32_t>& subset,
    549                                   SkPDFStream** fontStream) {
    550     int ttcIndex;
    551     SkAutoTUnref<SkStream> fontData(typeface->openStream(&ttcIndex));
    552 
    553     int fontSize = fontData->getLength();
    554 
    555 #if defined (SK_SFNTLY_SUBSETTER)
    556     // Read font into buffer.
    557     SkPDFStream* subsetFontStream = NULL;
    558     SkTDArray<unsigned char> originalFont;
    559     originalFont.setCount(fontSize);
    560     if (fontData->read(originalFont.begin(), fontSize) == (size_t)fontSize) {
    561         unsigned char* subsetFont = NULL;
    562         // sfntly requires unsigned int* to be passed in, as far as we know,
    563         // unsigned int is equivalent to uint32_t on all platforms.
    564         SK_COMPILE_ASSERT(sizeof(unsigned int) == sizeof(uint32_t),
    565                           unsigned_int_not_32_bits);
    566         int subsetFontSize = SfntlyWrapper::SubsetFont(fontName,
    567                                                        originalFont.begin(),
    568                                                        fontSize,
    569                                                        subset.begin(),
    570                                                        subset.count(),
    571                                                        &subsetFont);
    572         if (subsetFontSize > 0 && subsetFont != NULL) {
    573             SkAutoDataUnref data(SkData::NewWithProc(subsetFont,
    574                                                      subsetFontSize,
    575                                                      sk_delete_array,
    576                                                      NULL));
    577             subsetFontStream = new SkPDFStream(data.get());
    578             fontSize = subsetFontSize;
    579         }
    580     }
    581     if (subsetFontStream) {
    582         *fontStream = subsetFontStream;
    583         return fontSize;
    584     }
    585     fontData->rewind();
    586 #else
    587     sk_ignore_unused_variable(fontName);
    588     sk_ignore_unused_variable(subset);
    589 #endif
    590 
    591     // Fail over: just embed the whole font.
    592     *fontStream = new SkPDFStream(fontData.get());
    593     return fontSize;
    594 }
    595 
    596 ///////////////////////////////////////////////////////////////////////////////
    597 // class SkPDFGlyphSet
    598 ///////////////////////////////////////////////////////////////////////////////
    599 
    600 SkPDFGlyphSet::SkPDFGlyphSet() : fBitSet(SK_MaxU16 + 1) {
    601 }
    602 
    603 void SkPDFGlyphSet::set(const uint16_t* glyphIDs, int numGlyphs) {
    604     for (int i = 0; i < numGlyphs; ++i) {
    605         fBitSet.setBit(glyphIDs[i], true);
    606     }
    607 }
    608 
    609 bool SkPDFGlyphSet::has(uint16_t glyphID) const {
    610     return fBitSet.isBitSet(glyphID);
    611 }
    612 
    613 void SkPDFGlyphSet::merge(const SkPDFGlyphSet& usage) {
    614     fBitSet.orBits(usage.fBitSet);
    615 }
    616 
    617 void SkPDFGlyphSet::exportTo(SkTDArray<unsigned int>* glyphIDs) const {
    618     fBitSet.exportTo(glyphIDs);
    619 }
    620 
    621 ///////////////////////////////////////////////////////////////////////////////
    622 // class SkPDFGlyphSetMap
    623 ///////////////////////////////////////////////////////////////////////////////
    624 SkPDFGlyphSetMap::FontGlyphSetPair::FontGlyphSetPair(SkPDFFont* font,
    625                                                      SkPDFGlyphSet* glyphSet)
    626         : fFont(font),
    627           fGlyphSet(glyphSet) {
    628 }
    629 
    630 SkPDFGlyphSetMap::F2BIter::F2BIter(const SkPDFGlyphSetMap& map) {
    631     reset(map);
    632 }
    633 
    634 const SkPDFGlyphSetMap::FontGlyphSetPair* SkPDFGlyphSetMap::F2BIter::next() const {
    635     if (fIndex >= fMap->count()) {
    636         return NULL;
    637     }
    638     return &((*fMap)[fIndex++]);
    639 }
    640 
    641 void SkPDFGlyphSetMap::F2BIter::reset(const SkPDFGlyphSetMap& map) {
    642     fMap = &(map.fMap);
    643     fIndex = 0;
    644 }
    645 
    646 SkPDFGlyphSetMap::SkPDFGlyphSetMap() {
    647 }
    648 
    649 SkPDFGlyphSetMap::~SkPDFGlyphSetMap() {
    650     reset();
    651 }
    652 
    653 void SkPDFGlyphSetMap::merge(const SkPDFGlyphSetMap& usage) {
    654     for (int i = 0; i < usage.fMap.count(); ++i) {
    655         SkPDFGlyphSet* myUsage = getGlyphSetForFont(usage.fMap[i].fFont);
    656         myUsage->merge(*(usage.fMap[i].fGlyphSet));
    657     }
    658 }
    659 
    660 void SkPDFGlyphSetMap::reset() {
    661     for (int i = 0; i < fMap.count(); ++i) {
    662         delete fMap[i].fGlyphSet;  // Should not be NULL.
    663     }
    664     fMap.reset();
    665 }
    666 
    667 void SkPDFGlyphSetMap::noteGlyphUsage(SkPDFFont* font, const uint16_t* glyphIDs,
    668                                       int numGlyphs) {
    669     SkPDFGlyphSet* subset = getGlyphSetForFont(font);
    670     if (subset) {
    671         subset->set(glyphIDs, numGlyphs);
    672     }
    673 }
    674 
    675 SkPDFGlyphSet* SkPDFGlyphSetMap::getGlyphSetForFont(SkPDFFont* font) {
    676     int index = fMap.count();
    677     for (int i = 0; i < index; ++i) {
    678         if (fMap[i].fFont == font) {
    679             return fMap[i].fGlyphSet;
    680         }
    681     }
    682     fMap.append();
    683     index = fMap.count() - 1;
    684     fMap[index].fFont = font;
    685     fMap[index].fGlyphSet = new SkPDFGlyphSet();
    686     return fMap[index].fGlyphSet;
    687 }
    688 
    689 ///////////////////////////////////////////////////////////////////////////////
    690 // class SkPDFFont
    691 ///////////////////////////////////////////////////////////////////////////////
    692 
    693 /* Font subset design: It would be nice to be able to subset fonts
    694  * (particularly type 3 fonts), but it's a lot of work and not a priority.
    695  *
    696  * Resources are canonicalized and uniqueified by pointer so there has to be
    697  * some additional state indicating which subset of the font is used.  It
    698  * must be maintained at the page granularity and then combined at the document
    699  * granularity. a) change SkPDFFont to fill in its state on demand, kind of
    700  * like SkPDFGraphicState.  b) maintain a per font glyph usage class in each
    701  * page/pdf device. c) in the document, retrieve the per font glyph usage
    702  * from each page and combine it and ask for a resource with that subset.
    703  */
    704 
    705 SkPDFFont::~SkPDFFont() {
    706     SkAutoMutexAcquire lock(CanonicalFontsMutex());
    707     int index = -1;
    708     for (int i = 0 ; i < CanonicalFonts().count() ; i++) {
    709         if (CanonicalFonts()[i].fFont == this) {
    710             index = i;
    711         }
    712     }
    713 
    714     SkDEBUGCODE(int indexFound;)
    715     SkASSERT(index == -1 ||
    716              (Find(fTypeface->uniqueID(),
    717                    fFirstGlyphID,
    718                    &indexFound) &&
    719              index == indexFound));
    720     if (index >= 0) {
    721         CanonicalFonts().removeShuffle(index);
    722     }
    723     fResources.unrefAll();
    724 }
    725 
    726 void SkPDFFont::getResources(const SkTSet<SkPDFObject*>& knownResourceObjects,
    727                              SkTSet<SkPDFObject*>* newResourceObjects) {
    728     GetResourcesHelper(&fResources, knownResourceObjects, newResourceObjects);
    729 }
    730 
    731 SkTypeface* SkPDFFont::typeface() {
    732     return fTypeface.get();
    733 }
    734 
    735 SkAdvancedTypefaceMetrics::FontType SkPDFFont::getType() {
    736     return fFontType;
    737 }
    738 
    739 bool SkPDFFont::hasGlyph(uint16_t id) {
    740     return (id >= fFirstGlyphID && id <= fLastGlyphID) || id == 0;
    741 }
    742 
    743 size_t SkPDFFont::glyphsToPDFFontEncoding(uint16_t* glyphIDs,
    744                                           size_t numGlyphs) {
    745     // A font with multibyte glyphs will support all glyph IDs in a single font.
    746     if (this->multiByteGlyphs()) {
    747         return numGlyphs;
    748     }
    749 
    750     for (size_t i = 0; i < numGlyphs; i++) {
    751         if (glyphIDs[i] == 0) {
    752             continue;
    753         }
    754         if (glyphIDs[i] < fFirstGlyphID || glyphIDs[i] > fLastGlyphID) {
    755             return i;
    756         }
    757         glyphIDs[i] -= (fFirstGlyphID - 1);
    758     }
    759 
    760     return numGlyphs;
    761 }
    762 
    763 // static
    764 SkPDFFont* SkPDFFont::GetFontResource(SkTypeface* typeface, uint16_t glyphID) {
    765     SkAutoMutexAcquire lock(CanonicalFontsMutex());
    766 
    767     SkAutoResolveDefaultTypeface autoResolve(typeface);
    768     typeface = autoResolve.get();
    769 
    770     const uint32_t fontID = typeface->uniqueID();
    771     int relatedFontIndex;
    772     if (Find(fontID, glyphID, &relatedFontIndex)) {
    773         CanonicalFonts()[relatedFontIndex].fFont->ref();
    774         return CanonicalFonts()[relatedFontIndex].fFont;
    775     }
    776 
    777     SkAutoTUnref<SkAdvancedTypefaceMetrics> fontMetrics;
    778     SkPDFDict* relatedFontDescriptor = NULL;
    779     if (relatedFontIndex >= 0) {
    780         SkPDFFont* relatedFont = CanonicalFonts()[relatedFontIndex].fFont;
    781         fontMetrics.reset(relatedFont->fontInfo());
    782         SkSafeRef(fontMetrics.get());
    783         relatedFontDescriptor = relatedFont->getFontDescriptor();
    784 
    785         // This only is to catch callers who pass invalid glyph ids.
    786         // If glyph id is invalid, then we will create duplicate entries
    787         // for True Type fonts.
    788         SkAdvancedTypefaceMetrics::FontType fontType =
    789             fontMetrics.get() ? fontMetrics.get()->fType :
    790                                 SkAdvancedTypefaceMetrics::kOther_Font;
    791 
    792         if (fontType == SkAdvancedTypefaceMetrics::kType1CID_Font ||
    793             fontType == SkAdvancedTypefaceMetrics::kTrueType_Font) {
    794             CanonicalFonts()[relatedFontIndex].fFont->ref();
    795             return CanonicalFonts()[relatedFontIndex].fFont;
    796         }
    797     } else {
    798         SkAdvancedTypefaceMetrics::PerGlyphInfo info;
    799         info = SkAdvancedTypefaceMetrics::kGlyphNames_PerGlyphInfo;
    800         info = SkTBitOr<SkAdvancedTypefaceMetrics::PerGlyphInfo>(
    801                   info, SkAdvancedTypefaceMetrics::kToUnicode_PerGlyphInfo);
    802 #if !defined (SK_SFNTLY_SUBSETTER)
    803         info = SkTBitOr<SkAdvancedTypefaceMetrics::PerGlyphInfo>(
    804                   info, SkAdvancedTypefaceMetrics::kHAdvance_PerGlyphInfo);
    805 #endif
    806         fontMetrics.reset(
    807             typeface->getAdvancedTypefaceMetrics(info, NULL, 0));
    808 #if defined (SK_SFNTLY_SUBSETTER)
    809         if (fontMetrics.get() &&
    810             fontMetrics->fType != SkAdvancedTypefaceMetrics::kTrueType_Font) {
    811             // Font does not support subsetting, get new info with advance.
    812             info = SkTBitOr<SkAdvancedTypefaceMetrics::PerGlyphInfo>(
    813                       info, SkAdvancedTypefaceMetrics::kHAdvance_PerGlyphInfo);
    814             fontMetrics.reset(
    815                 typeface->getAdvancedTypefaceMetrics(info, NULL, 0));
    816         }
    817 #endif
    818     }
    819 
    820     SkPDFFont* font = Create(fontMetrics.get(), typeface, glyphID,
    821                              relatedFontDescriptor);
    822     FontRec newEntry(font, fontID, font->fFirstGlyphID);
    823     CanonicalFonts().push(newEntry);
    824     return font;  // Return the reference new SkPDFFont() created.
    825 }
    826 
    827 SkPDFFont* SkPDFFont::getFontSubset(const SkPDFGlyphSet*) {
    828     return NULL;  // Default: no support.
    829 }
    830 
    831 // static
    832 SkTDArray<SkPDFFont::FontRec>& SkPDFFont::CanonicalFonts() {
    833     // This initialization is only thread safe with gcc.
    834     static SkTDArray<FontRec> gCanonicalFonts;
    835     return gCanonicalFonts;
    836 }
    837 
    838 // static
    839 SkBaseMutex& SkPDFFont::CanonicalFontsMutex() {
    840     // This initialization is only thread safe with gcc, or when
    841     // POD-style mutex initialization is used.
    842     SK_DECLARE_STATIC_MUTEX(gCanonicalFontsMutex);
    843     return gCanonicalFontsMutex;
    844 }
    845 
    846 // static
    847 bool SkPDFFont::Find(uint32_t fontID, uint16_t glyphID, int* index) {
    848     // TODO(vandebo): Optimize this, do only one search?
    849     FontRec search(NULL, fontID, glyphID);
    850     *index = CanonicalFonts().find(search);
    851     if (*index >= 0) {
    852         return true;
    853     }
    854     search.fGlyphID = 0;
    855     *index = CanonicalFonts().find(search);
    856     return false;
    857 }
    858 
    859 SkPDFFont::SkPDFFont(SkAdvancedTypefaceMetrics* info, SkTypeface* typeface,
    860                      SkPDFDict* relatedFontDescriptor)
    861         : SkPDFDict("Font"),
    862           fTypeface(ref_or_default(typeface)),
    863           fFirstGlyphID(1),
    864           fLastGlyphID(info ? info->fLastGlyphID : 0),
    865           fFontInfo(info),
    866           fDescriptor(relatedFontDescriptor) {
    867     SkSafeRef(typeface);
    868     SkSafeRef(info);
    869     if (info == NULL) {
    870         fFontType = SkAdvancedTypefaceMetrics::kNotEmbeddable_Font;
    871     } else if (info->fMultiMaster) {
    872         fFontType = SkAdvancedTypefaceMetrics::kOther_Font;
    873     } else {
    874         fFontType = info->fType;
    875     }
    876 }
    877 
    878 // static
    879 SkPDFFont* SkPDFFont::Create(SkAdvancedTypefaceMetrics* info,
    880                              SkTypeface* typeface, uint16_t glyphID,
    881                              SkPDFDict* relatedFontDescriptor) {
    882     SkAdvancedTypefaceMetrics::FontType type =
    883         info ? info->fType : SkAdvancedTypefaceMetrics::kNotEmbeddable_Font;
    884 
    885     if (info && info->fMultiMaster) {
    886         NOT_IMPLEMENTED(true, true);
    887         return new SkPDFType3Font(info,
    888                                   typeface,
    889                                   glyphID);
    890     }
    891     if (type == SkAdvancedTypefaceMetrics::kType1CID_Font ||
    892         type == SkAdvancedTypefaceMetrics::kTrueType_Font) {
    893         SkASSERT(relatedFontDescriptor == NULL);
    894         return new SkPDFType0Font(info, typeface);
    895     }
    896     if (type == SkAdvancedTypefaceMetrics::kType1_Font) {
    897         return new SkPDFType1Font(info,
    898                                   typeface,
    899                                   glyphID,
    900                                   relatedFontDescriptor);
    901     }
    902 
    903     SkASSERT(type == SkAdvancedTypefaceMetrics::kCFF_Font ||
    904              type == SkAdvancedTypefaceMetrics::kOther_Font ||
    905              type == SkAdvancedTypefaceMetrics::kNotEmbeddable_Font);
    906 
    907     return new SkPDFType3Font(info, typeface, glyphID);
    908 }
    909 
    910 SkAdvancedTypefaceMetrics* SkPDFFont::fontInfo() {
    911     return fFontInfo.get();
    912 }
    913 
    914 void SkPDFFont::setFontInfo(SkAdvancedTypefaceMetrics* info) {
    915     if (info == NULL || info == fFontInfo.get()) {
    916         return;
    917     }
    918     fFontInfo.reset(info);
    919     SkSafeRef(info);
    920 }
    921 
    922 uint16_t SkPDFFont::firstGlyphID() const {
    923     return fFirstGlyphID;
    924 }
    925 
    926 uint16_t SkPDFFont::lastGlyphID() const {
    927     return fLastGlyphID;
    928 }
    929 
    930 void SkPDFFont::setLastGlyphID(uint16_t glyphID) {
    931     fLastGlyphID = glyphID;
    932 }
    933 
    934 void SkPDFFont::addResource(SkPDFObject* object) {
    935     SkASSERT(object != NULL);
    936     fResources.push(object);
    937     object->ref();
    938 }
    939 
    940 SkPDFDict* SkPDFFont::getFontDescriptor() {
    941     return fDescriptor.get();
    942 }
    943 
    944 void SkPDFFont::setFontDescriptor(SkPDFDict* descriptor) {
    945     fDescriptor.reset(descriptor);
    946     SkSafeRef(descriptor);
    947 }
    948 
    949 bool SkPDFFont::addCommonFontDescriptorEntries(int16_t defaultWidth) {
    950     if (fDescriptor.get() == NULL) {
    951         return false;
    952     }
    953 
    954     const uint16_t emSize = fFontInfo->fEmSize;
    955 
    956     fDescriptor->insertName("FontName", fFontInfo->fFontName);
    957     fDescriptor->insertInt("Flags", fFontInfo->fStyle | kPdfSymbolic);
    958     fDescriptor->insertScalar("Ascent",
    959             scaleFromFontUnits(fFontInfo->fAscent, emSize));
    960     fDescriptor->insertScalar("Descent",
    961             scaleFromFontUnits(fFontInfo->fDescent, emSize));
    962     fDescriptor->insertScalar("StemV",
    963             scaleFromFontUnits(fFontInfo->fStemV, emSize));
    964     fDescriptor->insertScalar("CapHeight",
    965             scaleFromFontUnits(fFontInfo->fCapHeight, emSize));
    966     fDescriptor->insertInt("ItalicAngle", fFontInfo->fItalicAngle);
    967     fDescriptor->insert("FontBBox", makeFontBBox(fFontInfo->fBBox,
    968                                                  fFontInfo->fEmSize))->unref();
    969 
    970     if (defaultWidth > 0) {
    971         fDescriptor->insertScalar("MissingWidth",
    972                 scaleFromFontUnits(defaultWidth, emSize));
    973     }
    974     return true;
    975 }
    976 
    977 void SkPDFFont::adjustGlyphRangeForSingleByteEncoding(int16_t glyphID) {
    978     // Single byte glyph encoding supports a max of 255 glyphs.
    979     fFirstGlyphID = glyphID - (glyphID - 1) % 255;
    980     if (fLastGlyphID > fFirstGlyphID + 255 - 1) {
    981         fLastGlyphID = fFirstGlyphID + 255 - 1;
    982     }
    983 }
    984 
    985 bool SkPDFFont::FontRec::operator==(const SkPDFFont::FontRec& b) const {
    986     if (fFontID != b.fFontID) {
    987         return false;
    988     }
    989     if (fFont != NULL && b.fFont != NULL) {
    990         return fFont->fFirstGlyphID == b.fFont->fFirstGlyphID &&
    991             fFont->fLastGlyphID == b.fFont->fLastGlyphID;
    992     }
    993     if (fGlyphID == 0 || b.fGlyphID == 0) {
    994         return true;
    995     }
    996 
    997     if (fFont != NULL) {
    998         return fFont->fFirstGlyphID <= b.fGlyphID &&
    999             b.fGlyphID <= fFont->fLastGlyphID;
   1000     } else if (b.fFont != NULL) {
   1001         return b.fFont->fFirstGlyphID <= fGlyphID &&
   1002             fGlyphID <= b.fFont->fLastGlyphID;
   1003     }
   1004     return fGlyphID == b.fGlyphID;
   1005 }
   1006 
   1007 SkPDFFont::FontRec::FontRec(SkPDFFont* font, uint32_t fontID, uint16_t glyphID)
   1008     : fFont(font),
   1009       fFontID(fontID),
   1010       fGlyphID(glyphID) {
   1011 }
   1012 
   1013 void SkPDFFont::populateToUnicodeTable(const SkPDFGlyphSet* subset) {
   1014     if (fFontInfo == NULL || fFontInfo->fGlyphToUnicode.begin() == NULL) {
   1015         return;
   1016     }
   1017     SkAutoTUnref<SkPDFStream> pdfCmap(
   1018         generate_tounicode_cmap(fFontInfo->fGlyphToUnicode, subset));
   1019     addResource(pdfCmap.get());
   1020     insert("ToUnicode", new SkPDFObjRef(pdfCmap.get()))->unref();
   1021 }
   1022 
   1023 ///////////////////////////////////////////////////////////////////////////////
   1024 // class SkPDFType0Font
   1025 ///////////////////////////////////////////////////////////////////////////////
   1026 
   1027 SkPDFType0Font::SkPDFType0Font(SkAdvancedTypefaceMetrics* info,
   1028                                SkTypeface* typeface)
   1029         : SkPDFFont(info, typeface, NULL) {
   1030     SkDEBUGCODE(fPopulated = false);
   1031 }
   1032 
   1033 SkPDFType0Font::~SkPDFType0Font() {}
   1034 
   1035 SkPDFFont* SkPDFType0Font::getFontSubset(const SkPDFGlyphSet* subset) {
   1036     SkPDFType0Font* newSubset = new SkPDFType0Font(fontInfo(), typeface());
   1037     newSubset->populate(subset);
   1038     return newSubset;
   1039 }
   1040 
   1041 #ifdef SK_DEBUG
   1042 void SkPDFType0Font::emitObject(SkWStream* stream, SkPDFCatalog* catalog,
   1043                                 bool indirect) {
   1044     SkASSERT(fPopulated);
   1045     return INHERITED::emitObject(stream, catalog, indirect);
   1046 }
   1047 #endif
   1048 
   1049 bool SkPDFType0Font::populate(const SkPDFGlyphSet* subset) {
   1050     insertName("Subtype", "Type0");
   1051     insertName("BaseFont", fontInfo()->fFontName);
   1052     insertName("Encoding", "Identity-H");
   1053 
   1054     SkAutoTUnref<SkPDFCIDFont> newCIDFont(
   1055             new SkPDFCIDFont(fontInfo(), typeface(), subset));
   1056     addResource(newCIDFont.get());
   1057     SkAutoTUnref<SkPDFArray> descendantFonts(new SkPDFArray());
   1058     descendantFonts->append(new SkPDFObjRef(newCIDFont.get()))->unref();
   1059     insert("DescendantFonts", descendantFonts.get());
   1060 
   1061     populateToUnicodeTable(subset);
   1062 
   1063     SkDEBUGCODE(fPopulated = true);
   1064     return true;
   1065 }
   1066 
   1067 ///////////////////////////////////////////////////////////////////////////////
   1068 // class SkPDFCIDFont
   1069 ///////////////////////////////////////////////////////////////////////////////
   1070 
   1071 SkPDFCIDFont::SkPDFCIDFont(SkAdvancedTypefaceMetrics* info,
   1072                            SkTypeface* typeface, const SkPDFGlyphSet* subset)
   1073         : SkPDFFont(info, typeface, NULL) {
   1074     populate(subset);
   1075 }
   1076 
   1077 SkPDFCIDFont::~SkPDFCIDFont() {}
   1078 
   1079 bool SkPDFCIDFont::addFontDescriptor(int16_t defaultWidth,
   1080                                      const SkTDArray<uint32_t>* subset) {
   1081     SkAutoTUnref<SkPDFDict> descriptor(new SkPDFDict("FontDescriptor"));
   1082     setFontDescriptor(descriptor.get());
   1083     addResource(descriptor.get());
   1084 
   1085     switch (getType()) {
   1086         case SkAdvancedTypefaceMetrics::kTrueType_Font: {
   1087             SkASSERT(subset);
   1088             // Font subsetting
   1089             SkPDFStream* rawStream = NULL;
   1090             int fontSize = get_subset_font_stream(fontInfo()->fFontName.c_str(),
   1091                                                   typeface(),
   1092                                                   *subset,
   1093                                                   &rawStream);
   1094             SkASSERT(fontSize);
   1095             SkASSERT(rawStream);
   1096             SkAutoTUnref<SkPDFStream> fontStream(rawStream);
   1097             addResource(fontStream.get());
   1098 
   1099             fontStream->insertInt("Length1", fontSize);
   1100             descriptor->insert("FontFile2",
   1101                                new SkPDFObjRef(fontStream.get()))->unref();
   1102             break;
   1103         }
   1104         case SkAdvancedTypefaceMetrics::kCFF_Font:
   1105         case SkAdvancedTypefaceMetrics::kType1CID_Font: {
   1106             int ttcIndex;
   1107             SkAutoTUnref<SkStream> fontData(typeface()->openStream(&ttcIndex));
   1108             SkAutoTUnref<SkPDFStream> fontStream(
   1109                 new SkPDFStream(fontData.get()));
   1110             addResource(fontStream.get());
   1111 
   1112             if (getType() == SkAdvancedTypefaceMetrics::kCFF_Font) {
   1113                 fontStream->insertName("Subtype", "Type1C");
   1114             } else {
   1115                 fontStream->insertName("Subtype", "CIDFontType0c");
   1116             }
   1117             descriptor->insert("FontFile3",
   1118                                 new SkPDFObjRef(fontStream.get()))->unref();
   1119             break;
   1120         }
   1121         default:
   1122             SkASSERT(false);
   1123     }
   1124 
   1125     insert("FontDescriptor", new SkPDFObjRef(descriptor.get()))->unref();
   1126     return addCommonFontDescriptorEntries(defaultWidth);
   1127 }
   1128 
   1129 bool SkPDFCIDFont::populate(const SkPDFGlyphSet* subset) {
   1130     // Generate new font metrics with advance info for true type fonts.
   1131     if (fontInfo()->fType == SkAdvancedTypefaceMetrics::kTrueType_Font) {
   1132         // Generate glyph id array.
   1133         SkTDArray<uint32_t> glyphIDs;
   1134         glyphIDs.push(0);  // Always include glyph 0.
   1135         if (subset) {
   1136             subset->exportTo(&glyphIDs);
   1137         }
   1138 
   1139         SkAdvancedTypefaceMetrics::PerGlyphInfo info;
   1140         info = SkAdvancedTypefaceMetrics::kGlyphNames_PerGlyphInfo;
   1141         info = SkTBitOr<SkAdvancedTypefaceMetrics::PerGlyphInfo>(
   1142                   info, SkAdvancedTypefaceMetrics::kHAdvance_PerGlyphInfo);
   1143         uint32_t* glyphs = (glyphIDs.count() == 1) ? NULL : glyphIDs.begin();
   1144         uint32_t glyphsCount = glyphs ? glyphIDs.count() : 0;
   1145         SkAutoTUnref<SkAdvancedTypefaceMetrics> fontMetrics(
   1146             typeface()->getAdvancedTypefaceMetrics(info, glyphs, glyphsCount));
   1147         setFontInfo(fontMetrics.get());
   1148         addFontDescriptor(0, &glyphIDs);
   1149     } else {
   1150         // Other CID fonts
   1151         addFontDescriptor(0, NULL);
   1152     }
   1153 
   1154     insertName("BaseFont", fontInfo()->fFontName);
   1155 
   1156     if (getType() == SkAdvancedTypefaceMetrics::kType1CID_Font) {
   1157         insertName("Subtype", "CIDFontType0");
   1158     } else if (getType() == SkAdvancedTypefaceMetrics::kTrueType_Font) {
   1159         insertName("Subtype", "CIDFontType2");
   1160         insertName("CIDToGIDMap", "Identity");
   1161     } else {
   1162         SkASSERT(false);
   1163     }
   1164 
   1165     SkAutoTUnref<SkPDFDict> sysInfo(new SkPDFDict);
   1166     sysInfo->insert("Registry", new SkPDFString("Adobe"))->unref();
   1167     sysInfo->insert("Ordering", new SkPDFString("Identity"))->unref();
   1168     sysInfo->insertInt("Supplement", 0);
   1169     insert("CIDSystemInfo", sysInfo.get());
   1170 
   1171     if (fontInfo()->fGlyphWidths.get()) {
   1172         int16_t defaultWidth = 0;
   1173         SkAutoTUnref<SkPDFArray> widths(
   1174             composeAdvanceData(fontInfo()->fGlyphWidths.get(),
   1175                                fontInfo()->fEmSize, &appendWidth,
   1176                                &defaultWidth));
   1177         if (widths->size())
   1178             insert("W", widths.get());
   1179         if (defaultWidth != 0) {
   1180             insertScalar("DW", scaleFromFontUnits(defaultWidth,
   1181                                                   fontInfo()->fEmSize));
   1182         }
   1183     }
   1184     if (fontInfo()->fVerticalMetrics.get()) {
   1185         struct SkAdvancedTypefaceMetrics::VerticalMetric defaultAdvance;
   1186         defaultAdvance.fVerticalAdvance = 0;
   1187         defaultAdvance.fOriginXDisp = 0;
   1188         defaultAdvance.fOriginYDisp = 0;
   1189         SkAutoTUnref<SkPDFArray> advances(
   1190             composeAdvanceData(fontInfo()->fVerticalMetrics.get(),
   1191                                fontInfo()->fEmSize, &appendVerticalAdvance,
   1192                                &defaultAdvance));
   1193         if (advances->size())
   1194             insert("W2", advances.get());
   1195         if (defaultAdvance.fVerticalAdvance ||
   1196                 defaultAdvance.fOriginXDisp ||
   1197                 defaultAdvance.fOriginYDisp) {
   1198             insert("DW2", appendVerticalAdvance(defaultAdvance,
   1199                                                 fontInfo()->fEmSize,
   1200                                                 new SkPDFArray))->unref();
   1201         }
   1202     }
   1203 
   1204     return true;
   1205 }
   1206 
   1207 ///////////////////////////////////////////////////////////////////////////////
   1208 // class SkPDFType1Font
   1209 ///////////////////////////////////////////////////////////////////////////////
   1210 
   1211 SkPDFType1Font::SkPDFType1Font(SkAdvancedTypefaceMetrics* info,
   1212                                SkTypeface* typeface,
   1213                                uint16_t glyphID,
   1214                                SkPDFDict* relatedFontDescriptor)
   1215         : SkPDFFont(info, typeface, relatedFontDescriptor) {
   1216     populate(glyphID);
   1217 }
   1218 
   1219 SkPDFType1Font::~SkPDFType1Font() {}
   1220 
   1221 bool SkPDFType1Font::addFontDescriptor(int16_t defaultWidth) {
   1222     if (getFontDescriptor() != NULL) {
   1223         SkPDFDict* descriptor = getFontDescriptor();
   1224         addResource(descriptor);
   1225         insert("FontDescriptor", new SkPDFObjRef(descriptor))->unref();
   1226         return true;
   1227     }
   1228 
   1229     SkAutoTUnref<SkPDFDict> descriptor(new SkPDFDict("FontDescriptor"));
   1230     setFontDescriptor(descriptor.get());
   1231 
   1232     int ttcIndex;
   1233     size_t header SK_INIT_TO_AVOID_WARNING;
   1234     size_t data SK_INIT_TO_AVOID_WARNING;
   1235     size_t trailer SK_INIT_TO_AVOID_WARNING;
   1236     SkAutoTUnref<SkStream> rawFontData(typeface()->openStream(&ttcIndex));
   1237     SkStream* fontData = handleType1Stream(rawFontData.get(), &header, &data,
   1238                                            &trailer);
   1239     if (fontData == NULL) {
   1240         return false;
   1241     }
   1242     SkAutoTUnref<SkPDFStream> fontStream(new SkPDFStream(fontData));
   1243     addResource(fontStream.get());
   1244     fontStream->insertInt("Length1", header);
   1245     fontStream->insertInt("Length2", data);
   1246     fontStream->insertInt("Length3", trailer);
   1247     descriptor->insert("FontFile", new SkPDFObjRef(fontStream.get()))->unref();
   1248 
   1249     addResource(descriptor.get());
   1250     insert("FontDescriptor", new SkPDFObjRef(descriptor.get()))->unref();
   1251 
   1252     return addCommonFontDescriptorEntries(defaultWidth);
   1253 }
   1254 
   1255 bool SkPDFType1Font::populate(int16_t glyphID) {
   1256     SkASSERT(!fontInfo()->fVerticalMetrics.get());
   1257     SkASSERT(fontInfo()->fGlyphWidths.get());
   1258 
   1259     adjustGlyphRangeForSingleByteEncoding(glyphID);
   1260 
   1261     int16_t defaultWidth = 0;
   1262     const SkAdvancedTypefaceMetrics::WidthRange* widthRangeEntry = NULL;
   1263     const SkAdvancedTypefaceMetrics::WidthRange* widthEntry;
   1264     for (widthEntry = fontInfo()->fGlyphWidths.get();
   1265             widthEntry != NULL;
   1266             widthEntry = widthEntry->fNext.get()) {
   1267         switch (widthEntry->fType) {
   1268             case SkAdvancedTypefaceMetrics::WidthRange::kDefault:
   1269                 defaultWidth = widthEntry->fAdvance[0];
   1270                 break;
   1271             case SkAdvancedTypefaceMetrics::WidthRange::kRun:
   1272                 SkASSERT(false);
   1273                 break;
   1274             case SkAdvancedTypefaceMetrics::WidthRange::kRange:
   1275                 SkASSERT(widthRangeEntry == NULL);
   1276                 widthRangeEntry = widthEntry;
   1277                 break;
   1278         }
   1279     }
   1280 
   1281     if (!addFontDescriptor(defaultWidth)) {
   1282         return false;
   1283     }
   1284 
   1285     insertName("Subtype", "Type1");
   1286     insertName("BaseFont", fontInfo()->fFontName);
   1287 
   1288     addWidthInfoFromRange(defaultWidth, widthRangeEntry);
   1289 
   1290     SkAutoTUnref<SkPDFDict> encoding(new SkPDFDict("Encoding"));
   1291     insert("Encoding", encoding.get());
   1292 
   1293     SkAutoTUnref<SkPDFArray> encDiffs(new SkPDFArray);
   1294     encoding->insert("Differences", encDiffs.get());
   1295 
   1296     encDiffs->reserve(lastGlyphID() - firstGlyphID() + 2);
   1297     encDiffs->appendInt(1);
   1298     for (int gID = firstGlyphID(); gID <= lastGlyphID(); gID++) {
   1299         encDiffs->appendName(fontInfo()->fGlyphNames->get()[gID].c_str());
   1300     }
   1301 
   1302     return true;
   1303 }
   1304 
   1305 void SkPDFType1Font::addWidthInfoFromRange(
   1306         int16_t defaultWidth,
   1307         const SkAdvancedTypefaceMetrics::WidthRange* widthRangeEntry) {
   1308     SkAutoTUnref<SkPDFArray> widthArray(new SkPDFArray());
   1309     int firstChar = 0;
   1310     if (widthRangeEntry) {
   1311         const uint16_t emSize = fontInfo()->fEmSize;
   1312         int startIndex = firstGlyphID() - widthRangeEntry->fStartId;
   1313         int endIndex = startIndex + lastGlyphID() - firstGlyphID() + 1;
   1314         if (startIndex < 0)
   1315             startIndex = 0;
   1316         if (endIndex > widthRangeEntry->fAdvance.count())
   1317             endIndex = widthRangeEntry->fAdvance.count();
   1318         if (widthRangeEntry->fStartId == 0) {
   1319             appendWidth(widthRangeEntry->fAdvance[0], emSize, widthArray.get());
   1320         } else {
   1321             firstChar = startIndex + widthRangeEntry->fStartId;
   1322         }
   1323         for (int i = startIndex; i < endIndex; i++) {
   1324             appendWidth(widthRangeEntry->fAdvance[i], emSize, widthArray.get());
   1325         }
   1326     } else {
   1327         appendWidth(defaultWidth, 1000, widthArray.get());
   1328     }
   1329     insertInt("FirstChar", firstChar);
   1330     insertInt("LastChar", firstChar + widthArray->size() - 1);
   1331     insert("Widths", widthArray.get());
   1332 }
   1333 
   1334 ///////////////////////////////////////////////////////////////////////////////
   1335 // class SkPDFType3Font
   1336 ///////////////////////////////////////////////////////////////////////////////
   1337 
   1338 SkPDFType3Font::SkPDFType3Font(SkAdvancedTypefaceMetrics* info,
   1339                                SkTypeface* typeface,
   1340                                uint16_t glyphID)
   1341         : SkPDFFont(info, typeface, NULL) {
   1342     populate(glyphID);
   1343 }
   1344 
   1345 SkPDFType3Font::~SkPDFType3Font() {}
   1346 
   1347 bool SkPDFType3Font::populate(int16_t glyphID) {
   1348     SkPaint paint;
   1349     paint.setTypeface(typeface());
   1350     paint.setTextSize(1000);
   1351     SkAutoGlyphCache autoCache(paint, NULL, NULL);
   1352     SkGlyphCache* cache = autoCache.getCache();
   1353     // If fLastGlyphID isn't set (because there is not fFontInfo), look it up.
   1354     if (lastGlyphID() == 0) {
   1355         setLastGlyphID(cache->getGlyphCount() - 1);
   1356     }
   1357 
   1358     adjustGlyphRangeForSingleByteEncoding(glyphID);
   1359 
   1360     insertName("Subtype", "Type3");
   1361     // Flip about the x-axis and scale by 1/1000.
   1362     SkMatrix fontMatrix;
   1363     fontMatrix.setScale(SkScalarInvert(1000), -SkScalarInvert(1000));
   1364     insert("FontMatrix", SkPDFUtils::MatrixToArray(fontMatrix))->unref();
   1365 
   1366     SkAutoTUnref<SkPDFDict> charProcs(new SkPDFDict);
   1367     insert("CharProcs", charProcs.get());
   1368 
   1369     SkAutoTUnref<SkPDFDict> encoding(new SkPDFDict("Encoding"));
   1370     insert("Encoding", encoding.get());
   1371 
   1372     SkAutoTUnref<SkPDFArray> encDiffs(new SkPDFArray);
   1373     encoding->insert("Differences", encDiffs.get());
   1374     encDiffs->reserve(lastGlyphID() - firstGlyphID() + 2);
   1375     encDiffs->appendInt(1);
   1376 
   1377     SkAutoTUnref<SkPDFArray> widthArray(new SkPDFArray());
   1378 
   1379     SkIRect bbox = SkIRect::MakeEmpty();
   1380     for (int gID = firstGlyphID(); gID <= lastGlyphID(); gID++) {
   1381         SkString characterName;
   1382         characterName.printf("gid%d", gID);
   1383         encDiffs->appendName(characterName.c_str());
   1384 
   1385         const SkGlyph& glyph = cache->getGlyphIDMetrics(gID);
   1386         widthArray->appendScalar(SkFixedToScalar(glyph.fAdvanceX));
   1387         SkIRect glyphBBox = SkIRect::MakeXYWH(glyph.fLeft, glyph.fTop,
   1388                                               glyph.fWidth, glyph.fHeight);
   1389         bbox.join(glyphBBox);
   1390 
   1391         SkDynamicMemoryWStream content;
   1392         setGlyphWidthAndBoundingBox(SkFixedToScalar(glyph.fAdvanceX), glyphBBox,
   1393                                     &content);
   1394         const SkPath* path = cache->findPath(glyph);
   1395         if (path) {
   1396             SkPDFUtils::EmitPath(*path, paint.getStyle(), &content);
   1397             SkPDFUtils::PaintPath(paint.getStyle(), path->getFillType(),
   1398                                   &content);
   1399         }
   1400         SkAutoTUnref<SkMemoryStream> glyphStream(new SkMemoryStream());
   1401         glyphStream->setData(content.copyToData())->unref();
   1402 
   1403         SkAutoTUnref<SkPDFStream> glyphDescription(
   1404             new SkPDFStream(glyphStream.get()));
   1405         addResource(glyphDescription.get());
   1406         charProcs->insert(characterName.c_str(),
   1407                           new SkPDFObjRef(glyphDescription.get()))->unref();
   1408     }
   1409 
   1410     insert("FontBBox", makeFontBBox(bbox, 1000))->unref();
   1411     insertInt("FirstChar", firstGlyphID());
   1412     insertInt("LastChar", lastGlyphID());
   1413     insert("Widths", widthArray.get());
   1414     insertName("CIDToGIDMap", "Identity");
   1415 
   1416     populateToUnicodeTable(NULL);
   1417     return true;
   1418 }
   1419