| /* |
| * 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 <ctype.h> |
| |
| #include "SkData.h" |
| #include "SkGlyphCache.h" |
| #include "SkPaint.h" |
| #include "SkPDFCanon.h" |
| #include "SkPDFDevice.h" |
| #include "SkPDFFont.h" |
| #include "SkPDFFontImpl.h" |
| #include "SkPDFStream.h" |
| #include "SkPDFTypes.h" |
| #include "SkPDFUtils.h" |
| #include "SkRefCnt.h" |
| #include "SkScalar.h" |
| #include "SkStream.h" |
| #include "SkTypefacePriv.h" |
| #include "SkTypes.h" |
| #include "SkUtils.h" |
| |
| #if defined (SK_SFNTLY_SUBSETTER) |
| #if defined (GOOGLE3) |
| // #including #defines doesn't work with this build system. |
| #include "typography/font/sfntly/src/sample/chromium/font_subsetter.h" |
| #else |
| #include SK_SFNTLY_SUBSETTER |
| #endif |
| #endif |
| |
| // PDF's notion of symbolic vs non-symbolic is related to the character set, not |
| // symbols vs. characters. Rarely is a font the right character set to call it |
| // non-symbolic, so always call it symbolic. (PDF 1.4 spec, section 5.7.1) |
| static const int kPdfSymbolic = 4; |
| |
| namespace { |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // File-Local Functions |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| bool parsePFBSection(const uint8_t** src, size_t* len, int sectionType, |
| size_t* size) { |
| // PFB sections have a two or six bytes header. 0x80 and a one byte |
| // section type followed by a four byte section length. Type one is |
| // an ASCII section (includes a length), type two is a binary section |
| // (includes a length) and type three is an EOF marker with no length. |
| const uint8_t* buf = *src; |
| if (*len < 2 || buf[0] != 0x80 || buf[1] != sectionType) { |
| return false; |
| } else if (buf[1] == 3) { |
| return true; |
| } else if (*len < 6) { |
| return false; |
| } |
| |
| *size = (size_t)buf[2] | ((size_t)buf[3] << 8) | ((size_t)buf[4] << 16) | |
| ((size_t)buf[5] << 24); |
| size_t consumed = *size + 6; |
| if (consumed > *len) { |
| return false; |
| } |
| *src = *src + consumed; |
| *len = *len - consumed; |
| return true; |
| } |
| |
| bool parsePFB(const uint8_t* src, size_t size, size_t* headerLen, |
| size_t* dataLen, size_t* trailerLen) { |
| const uint8_t* srcPtr = src; |
| size_t remaining = size; |
| |
| return parsePFBSection(&srcPtr, &remaining, 1, headerLen) && |
| parsePFBSection(&srcPtr, &remaining, 2, dataLen) && |
| parsePFBSection(&srcPtr, &remaining, 1, trailerLen) && |
| parsePFBSection(&srcPtr, &remaining, 3, nullptr); |
| } |
| |
| /* The sections of a PFA file are implicitly defined. The body starts |
| * after the line containing "eexec," and the trailer starts with 512 |
| * literal 0's followed by "cleartomark" (plus arbitrary white space). |
| * |
| * This function assumes that src is NUL terminated, but the NUL |
| * termination is not included in size. |
| * |
| */ |
| bool parsePFA(const char* src, size_t size, size_t* headerLen, |
| size_t* hexDataLen, size_t* dataLen, size_t* trailerLen) { |
| const char* end = src + size; |
| |
| const char* dataPos = strstr(src, "eexec"); |
| if (!dataPos) { |
| return false; |
| } |
| dataPos += strlen("eexec"); |
| while ((*dataPos == '\n' || *dataPos == '\r' || *dataPos == ' ') && |
| dataPos < end) { |
| dataPos++; |
| } |
| *headerLen = dataPos - src; |
| |
| const char* trailerPos = strstr(dataPos, "cleartomark"); |
| if (!trailerPos) { |
| return false; |
| } |
| int zeroCount = 0; |
| for (trailerPos--; trailerPos > dataPos && zeroCount < 512; trailerPos--) { |
| if (*trailerPos == '\n' || *trailerPos == '\r' || *trailerPos == ' ') { |
| continue; |
| } else if (*trailerPos == '0') { |
| zeroCount++; |
| } else { |
| return false; |
| } |
| } |
| if (zeroCount != 512) { |
| return false; |
| } |
| |
| *hexDataLen = trailerPos - src - *headerLen; |
| *trailerLen = size - *headerLen - *hexDataLen; |
| |
| // Verify that the data section is hex encoded and count the bytes. |
| int nibbles = 0; |
| for (; dataPos < trailerPos; dataPos++) { |
| if (isspace(*dataPos)) { |
| continue; |
| } |
| if (!isxdigit(*dataPos)) { |
| return false; |
| } |
| nibbles++; |
| } |
| *dataLen = (nibbles + 1) / 2; |
| |
| return true; |
| } |
| |
| int8_t hexToBin(uint8_t c) { |
| if (!isxdigit(c)) { |
| return -1; |
| } else if (c <= '9') { |
| return c - '0'; |
| } else if (c <= 'F') { |
| return c - 'A' + 10; |
| } else if (c <= 'f') { |
| return c - 'a' + 10; |
| } |
| return -1; |
| } |
| |
| static SkData* handle_type1_stream(SkStream* srcStream, size_t* headerLen, |
| size_t* dataLen, size_t* trailerLen) { |
| // srcStream may be backed by a file or a unseekable fd, so we may not be |
| // able to use skip(), rewind(), or getMemoryBase(). read()ing through |
| // the input only once is doable, but very ugly. Furthermore, it'd be nice |
| // if the data was NUL terminated so that we can use strstr() to search it. |
| // Make as few copies as possible given these constraints. |
| SkDynamicMemoryWStream dynamicStream; |
| SkAutoTDelete<SkMemoryStream> staticStream; |
| SkData* data = nullptr; |
| const uint8_t* src; |
| size_t srcLen; |
| if ((srcLen = srcStream->getLength()) > 0) { |
| staticStream.reset(new SkMemoryStream(srcLen + 1)); |
| src = (const uint8_t*)staticStream->getMemoryBase(); |
| if (srcStream->getMemoryBase() != nullptr) { |
| memcpy((void *)src, srcStream->getMemoryBase(), srcLen); |
| } else { |
| size_t read = 0; |
| while (read < srcLen) { |
| size_t got = srcStream->read((void *)staticStream->getAtPos(), |
| srcLen - read); |
| if (got == 0) { |
| return nullptr; |
| } |
| read += got; |
| staticStream->seek(read); |
| } |
| } |
| ((uint8_t *)src)[srcLen] = 0; |
| } else { |
| static const size_t kBufSize = 4096; |
| uint8_t buf[kBufSize]; |
| size_t amount; |
| while ((amount = srcStream->read(buf, kBufSize)) > 0) { |
| dynamicStream.write(buf, amount); |
| } |
| amount = 0; |
| dynamicStream.write(&amount, 1); // nullptr terminator. |
| data = dynamicStream.copyToData(); |
| src = data->bytes(); |
| srcLen = data->size() - 1; |
| } |
| |
| // this handles releasing the data we may have gotten from dynamicStream. |
| // if data is null, it is a no-op |
| SkAutoDataUnref aud(data); |
| |
| if (parsePFB(src, srcLen, headerLen, dataLen, trailerLen)) { |
| static const int kPFBSectionHeaderLength = 6; |
| const size_t length = *headerLen + *dataLen + *trailerLen; |
| SkASSERT(length > 0); |
| SkASSERT(length + (2 * kPFBSectionHeaderLength) <= srcLen); |
| |
| SkData* data = SkData::NewUninitialized(length); |
| |
| const uint8_t* const srcHeader = src + kPFBSectionHeaderLength; |
| // There is a six-byte section header before header and data |
| // (but not trailer) that we're not going to copy. |
| const uint8_t* const srcData = srcHeader + *headerLen + kPFBSectionHeaderLength; |
| const uint8_t* const srcTrailer = srcData + *headerLen; |
| |
| uint8_t* const resultHeader = (uint8_t*)data->writable_data(); |
| uint8_t* const resultData = resultHeader + *headerLen; |
| uint8_t* const resultTrailer = resultData + *dataLen; |
| |
| SkASSERT(resultTrailer + *trailerLen == resultHeader + length); |
| |
| memcpy(resultHeader, srcHeader, *headerLen); |
| memcpy(resultData, srcData, *dataLen); |
| memcpy(resultTrailer, srcTrailer, *trailerLen); |
| |
| return data; |
| } |
| |
| // A PFA has to be converted for PDF. |
| size_t hexDataLen; |
| if (parsePFA((const char*)src, srcLen, headerLen, &hexDataLen, dataLen, |
| trailerLen)) { |
| const size_t length = *headerLen + *dataLen + *trailerLen; |
| SkASSERT(length > 0); |
| SkAutoTMalloc<uint8_t> buffer(length); |
| |
| memcpy(buffer.get(), src, *headerLen); |
| uint8_t* const resultData = &(buffer[SkToInt(*headerLen)]); |
| |
| const uint8_t* hexData = src + *headerLen; |
| const uint8_t* trailer = hexData + hexDataLen; |
| size_t outputOffset = 0; |
| uint8_t dataByte = 0; // To hush compiler. |
| bool highNibble = true; |
| for (; hexData < trailer; hexData++) { |
| int8_t curNibble = hexToBin(*hexData); |
| if (curNibble < 0) { |
| continue; |
| } |
| if (highNibble) { |
| dataByte = curNibble << 4; |
| highNibble = false; |
| } else { |
| dataByte |= curNibble; |
| highNibble = true; |
| resultData[outputOffset++] = dataByte; |
| } |
| } |
| if (!highNibble) { |
| resultData[outputOffset++] = dataByte; |
| } |
| SkASSERT(outputOffset == *dataLen); |
| |
| uint8_t* const resultTrailer = &(buffer[SkToInt(*headerLen + outputOffset)]); |
| memcpy(resultTrailer, src + *headerLen + hexDataLen, *trailerLen); |
| |
| return SkData::NewFromMalloc(buffer.release(), length); |
| } |
| return nullptr; |
| } |
| |
| // scale from em-units to base-1000, returning as a SkScalar |
| SkScalar scaleFromFontUnits(int16_t val, uint16_t emSize) { |
| SkScalar scaled = SkIntToScalar(val); |
| if (emSize == 1000) { |
| return scaled; |
| } else { |
| return SkScalarMulDiv(scaled, 1000, emSize); |
| } |
| } |
| |
| void setGlyphWidthAndBoundingBox(SkScalar width, SkIRect box, |
| SkWStream* content) { |
| // Specify width and bounding box for the glyph. |
| SkPDFUtils::AppendScalar(width, content); |
| content->writeText(" 0 "); |
| content->writeDecAsText(box.fLeft); |
| content->writeText(" "); |
| content->writeDecAsText(box.fTop); |
| content->writeText(" "); |
| content->writeDecAsText(box.fRight); |
| content->writeText(" "); |
| content->writeDecAsText(box.fBottom); |
| content->writeText(" d1\n"); |
| } |
| |
| static sk_sp<SkPDFArray> makeFontBBox(SkIRect glyphBBox, uint16_t emSize) { |
| auto bbox = sk_make_sp<SkPDFArray>(); |
| bbox->reserve(4); |
| bbox->appendScalar(scaleFromFontUnits(glyphBBox.fLeft, emSize)); |
| bbox->appendScalar(scaleFromFontUnits(glyphBBox.fBottom, emSize)); |
| bbox->appendScalar(scaleFromFontUnits(glyphBBox.fRight, emSize)); |
| bbox->appendScalar(scaleFromFontUnits(glyphBBox.fTop, emSize)); |
| return bbox; |
| } |
| |
| static void appendWidth(const int16_t& width, uint16_t emSize, |
| SkPDFArray* array) { |
| array->appendScalar(scaleFromFontUnits(width, emSize)); |
| } |
| |
| static void appendVerticalAdvance( |
| const SkAdvancedTypefaceMetrics::VerticalMetric& advance, |
| uint16_t emSize, SkPDFArray* array) { |
| appendWidth(advance.fVerticalAdvance, emSize, array); |
| appendWidth(advance.fOriginXDisp, emSize, array); |
| appendWidth(advance.fOriginYDisp, emSize, array); |
| } |
| |
| template <typename Data> |
| SkPDFArray* composeAdvanceData( |
| SkAdvancedTypefaceMetrics::AdvanceMetric<Data>* advanceInfo, |
| uint16_t emSize, |
| void (*appendAdvance)(const Data& advance, uint16_t emSize, |
| SkPDFArray* array), |
| Data* defaultAdvance) { |
| SkPDFArray* result = new SkPDFArray(); |
| for (; advanceInfo != nullptr; advanceInfo = advanceInfo->fNext.get()) { |
| switch (advanceInfo->fType) { |
| case SkAdvancedTypefaceMetrics::WidthRange::kDefault: { |
| SkASSERT(advanceInfo->fAdvance.count() == 1); |
| *defaultAdvance = advanceInfo->fAdvance[0]; |
| break; |
| } |
| case SkAdvancedTypefaceMetrics::WidthRange::kRange: { |
| auto advanceArray = sk_make_sp<SkPDFArray>(); |
| for (int j = 0; j < advanceInfo->fAdvance.count(); j++) |
| appendAdvance(advanceInfo->fAdvance[j], emSize, |
| advanceArray.get()); |
| result->appendInt(advanceInfo->fStartId); |
| result->appendObject(std::move(advanceArray)); |
| break; |
| } |
| case SkAdvancedTypefaceMetrics::WidthRange::kRun: { |
| SkASSERT(advanceInfo->fAdvance.count() == 1); |
| result->appendInt(advanceInfo->fStartId); |
| result->appendInt(advanceInfo->fEndId); |
| appendAdvance(advanceInfo->fAdvance[0], emSize, result); |
| break; |
| } |
| } |
| } |
| return result; |
| } |
| |
| } // namespace |
| |
| static void append_tounicode_header(SkDynamicMemoryWStream* cmap, |
| uint16_t firstGlyphID, |
| uint16_t lastGlyphID) { |
| // 12 dict begin: 12 is an Adobe-suggested value. Shall not change. |
| // It's there to prevent old version Adobe Readers from malfunctioning. |
| const char* kHeader = |
| "/CIDInit /ProcSet findresource begin\n" |
| "12 dict begin\n" |
| "begincmap\n"; |
| cmap->writeText(kHeader); |
| |
| // The /CIDSystemInfo must be consistent to the one in |
| // SkPDFFont::populateCIDFont(). |
| // We can not pass over the system info object here because the format is |
| // different. This is not a reference object. |
| const char* kSysInfo = |
| "/CIDSystemInfo\n" |
| "<< /Registry (Adobe)\n" |
| "/Ordering (UCS)\n" |
| "/Supplement 0\n" |
| ">> def\n"; |
| cmap->writeText(kSysInfo); |
| |
| // The CMapName must be consistent to /CIDSystemInfo above. |
| // /CMapType 2 means ToUnicode. |
| // Codespace range just tells the PDF processor the valid range. |
| const char* kTypeInfoHeader = |
| "/CMapName /Adobe-Identity-UCS def\n" |
| "/CMapType 2 def\n" |
| "1 begincodespacerange\n"; |
| cmap->writeText(kTypeInfoHeader); |
| |
| // e.g. "<0000> <FFFF>\n" |
| SkString range; |
| range.appendf("<%04X> <%04X>\n", firstGlyphID, lastGlyphID); |
| cmap->writeText(range.c_str()); |
| |
| const char* kTypeInfoFooter = "endcodespacerange\n"; |
| cmap->writeText(kTypeInfoFooter); |
| } |
| |
| static void append_cmap_footer(SkDynamicMemoryWStream* cmap) { |
| const char* kFooter = |
| "endcmap\n" |
| "CMapName currentdict /CMap defineresource pop\n" |
| "end\n" |
| "end"; |
| cmap->writeText(kFooter); |
| } |
| |
| struct BFChar { |
| uint16_t fGlyphId; |
| SkUnichar fUnicode; |
| }; |
| |
| struct BFRange { |
| uint16_t fStart; |
| uint16_t fEnd; |
| SkUnichar fUnicode; |
| }; |
| |
| static void append_bfchar_section(const SkTDArray<BFChar>& bfchar, |
| SkDynamicMemoryWStream* cmap) { |
| // PDF spec defines that every bf* list can have at most 100 entries. |
| for (int i = 0; i < bfchar.count(); i += 100) { |
| int count = bfchar.count() - i; |
| count = SkMin32(count, 100); |
| cmap->writeDecAsText(count); |
| cmap->writeText(" beginbfchar\n"); |
| for (int j = 0; j < count; ++j) { |
| cmap->writeText("<"); |
| cmap->writeHexAsText(bfchar[i + j].fGlyphId, 4); |
| cmap->writeText("> <"); |
| cmap->writeHexAsText(bfchar[i + j].fUnicode, 4); |
| cmap->writeText(">\n"); |
| } |
| cmap->writeText("endbfchar\n"); |
| } |
| } |
| |
| static void append_bfrange_section(const SkTDArray<BFRange>& bfrange, |
| SkDynamicMemoryWStream* cmap) { |
| // PDF spec defines that every bf* list can have at most 100 entries. |
| for (int i = 0; i < bfrange.count(); i += 100) { |
| int count = bfrange.count() - i; |
| count = SkMin32(count, 100); |
| cmap->writeDecAsText(count); |
| cmap->writeText(" beginbfrange\n"); |
| for (int j = 0; j < count; ++j) { |
| cmap->writeText("<"); |
| cmap->writeHexAsText(bfrange[i + j].fStart, 4); |
| cmap->writeText("> <"); |
| cmap->writeHexAsText(bfrange[i + j].fEnd, 4); |
| cmap->writeText("> <"); |
| cmap->writeHexAsText(bfrange[i + j].fUnicode, 4); |
| cmap->writeText(">\n"); |
| } |
| cmap->writeText("endbfrange\n"); |
| } |
| } |
| |
| // Generate <bfchar> and <bfrange> table according to PDF spec 1.4 and Adobe |
| // Technote 5014. |
| // The function is not static so we can test it in unit tests. |
| // |
| // Current implementation guarantees bfchar and bfrange entries do not overlap. |
| // |
| // Current implementation does not attempt aggresive optimizations against |
| // following case because the specification is not clear. |
| // |
| // 4 beginbfchar 1 beginbfchar |
| // <0003> <0013> <0020> <0014> |
| // <0005> <0015> to endbfchar |
| // <0007> <0017> 1 beginbfrange |
| // <0020> <0014> <0003> <0007> <0013> |
| // endbfchar endbfrange |
| // |
| // Adobe Technote 5014 said: "Code mappings (unlike codespace ranges) may |
| // overlap, but succeeding maps supersede preceding maps." |
| // |
| // In case of searching text in PDF, bfrange will have higher precedence so |
| // typing char id 0x0014 in search box will get glyph id 0x0004 first. However, |
| // the spec does not mention how will this kind of conflict being resolved. |
| // |
| // For the worst case (having 65536 continuous unicode and we use every other |
| // one of them), the possible savings by aggressive optimization is 416KB |
| // pre-compressed and does not provide enough motivation for implementation. |
| |
| // FIXME: this should be in a header so that it is separately testable |
| // ( see caller in tests/ToUnicode.cpp ) |
| void append_cmap_sections(const SkTDArray<SkUnichar>& glyphToUnicode, |
| const SkPDFGlyphSet* subset, |
| SkDynamicMemoryWStream* cmap, |
| bool multiByteGlyphs, |
| uint16_t firstGlyphID, |
| uint16_t lastGlyphID); |
| |
| void append_cmap_sections(const SkTDArray<SkUnichar>& glyphToUnicode, |
| const SkPDFGlyphSet* subset, |
| SkDynamicMemoryWStream* cmap, |
| bool multiByteGlyphs, |
| uint16_t firstGlyphID, |
| uint16_t lastGlyphID) { |
| if (glyphToUnicode.isEmpty()) { |
| return; |
| } |
| int glyphOffset = 0; |
| if (!multiByteGlyphs) { |
| glyphOffset = firstGlyphID - 1; |
| } |
| |
| SkTDArray<BFChar> bfcharEntries; |
| SkTDArray<BFRange> bfrangeEntries; |
| |
| BFRange currentRangeEntry = {0, 0, 0}; |
| bool rangeEmpty = true; |
| const int limit = |
| SkMin32(lastGlyphID + 1, glyphToUnicode.count()) - glyphOffset; |
| |
| for (int i = firstGlyphID - glyphOffset; i < limit + 1; ++i) { |
| bool inSubset = i < limit && |
| (subset == nullptr || subset->has(i + glyphOffset)); |
| if (!rangeEmpty) { |
| // PDF spec requires bfrange not changing the higher byte, |
| // e.g. <1035> <10FF> <2222> is ok, but |
| // <1035> <1100> <2222> is no good |
| bool inRange = |
| i == currentRangeEntry.fEnd + 1 && |
| i >> 8 == currentRangeEntry.fStart >> 8 && |
| i < limit && |
| glyphToUnicode[i + glyphOffset] == |
| currentRangeEntry.fUnicode + i - currentRangeEntry.fStart; |
| if (!inSubset || !inRange) { |
| if (currentRangeEntry.fEnd > currentRangeEntry.fStart) { |
| bfrangeEntries.push(currentRangeEntry); |
| } else { |
| BFChar* entry = bfcharEntries.append(); |
| entry->fGlyphId = currentRangeEntry.fStart; |
| entry->fUnicode = currentRangeEntry.fUnicode; |
| } |
| rangeEmpty = true; |
| } |
| } |
| if (inSubset) { |
| currentRangeEntry.fEnd = i; |
| if (rangeEmpty) { |
| currentRangeEntry.fStart = i; |
| currentRangeEntry.fUnicode = glyphToUnicode[i + glyphOffset]; |
| rangeEmpty = false; |
| } |
| } |
| } |
| |
| // The spec requires all bfchar entries for a font must come before bfrange |
| // entries. |
| append_bfchar_section(bfcharEntries, cmap); |
| append_bfrange_section(bfrangeEntries, cmap); |
| } |
| |
| static sk_sp<SkPDFStream> generate_tounicode_cmap( |
| const SkTDArray<SkUnichar>& glyphToUnicode, |
| const SkPDFGlyphSet* subset, |
| bool multiByteGlyphs, |
| uint16_t firstGlyphID, |
| uint16_t lastGlyphID) { |
| SkDynamicMemoryWStream cmap; |
| if (multiByteGlyphs) { |
| append_tounicode_header(&cmap, firstGlyphID, lastGlyphID); |
| } else { |
| append_tounicode_header(&cmap, 1, lastGlyphID - firstGlyphID + 1); |
| } |
| append_cmap_sections(glyphToUnicode, subset, &cmap, multiByteGlyphs, |
| firstGlyphID, lastGlyphID); |
| append_cmap_footer(&cmap); |
| sk_sp<SkData> cmapData(cmap.copyToData()); |
| return sk_make_sp<SkPDFStream>(cmapData.get()); |
| } |
| |
| #if defined (SK_SFNTLY_SUBSETTER) |
| static void sk_delete_array(const void* ptr, void*) { |
| // Use C-style cast to cast away const and cast type simultaneously. |
| delete[] (unsigned char*)ptr; |
| } |
| #endif |
| |
| #if defined(SK_SFNTLY_SUBSETTER) |
| static size_t get_subset_font_stream(const char* fontName, |
| const SkTypeface* typeface, |
| const SkTDArray<uint32_t>& subset, |
| SkPDFStream** fontStream) { |
| int ttcIndex; |
| SkAutoTDelete<SkStream> fontData(typeface->openStream(&ttcIndex)); |
| SkASSERT(fontData.get()); |
| |
| size_t fontSize = fontData->getLength(); |
| |
| // Read font into buffer. |
| SkPDFStream* subsetFontStream = nullptr; |
| SkTDArray<unsigned char> originalFont; |
| originalFont.setCount(SkToInt(fontSize)); |
| if (fontData->read(originalFont.begin(), fontSize) == fontSize) { |
| unsigned char* subsetFont = nullptr; |
| // sfntly requires unsigned int* to be passed in, as far as we know, |
| // unsigned int is equivalent to uint32_t on all platforms. |
| static_assert(sizeof(unsigned int) == sizeof(uint32_t), "unsigned_int_not_32_bits"); |
| int subsetFontSize = SfntlyWrapper::SubsetFont(fontName, |
| originalFont.begin(), |
| fontSize, |
| subset.begin(), |
| subset.count(), |
| &subsetFont); |
| if (subsetFontSize > 0 && subsetFont != nullptr) { |
| SkAutoDataUnref data(SkData::NewWithProc(subsetFont, |
| subsetFontSize, |
| sk_delete_array, |
| nullptr)); |
| subsetFontStream = new SkPDFStream(data.get()); |
| fontSize = subsetFontSize; |
| } |
| } |
| if (subsetFontStream) { |
| *fontStream = subsetFontStream; |
| return fontSize; |
| } |
| fontData->rewind(); |
| |
| // Fail over: just embed the whole font. |
| *fontStream = new SkPDFStream(fontData.get()); |
| return fontSize; |
| } |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // class SkPDFGlyphSet |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkPDFGlyphSet::SkPDFGlyphSet() : fBitSet(SK_MaxU16 + 1) { |
| } |
| |
| void SkPDFGlyphSet::set(const uint16_t* glyphIDs, int numGlyphs) { |
| for (int i = 0; i < numGlyphs; ++i) { |
| fBitSet.setBit(glyphIDs[i], true); |
| } |
| } |
| |
| bool SkPDFGlyphSet::has(uint16_t glyphID) const { |
| return fBitSet.isBitSet(glyphID); |
| } |
| |
| void SkPDFGlyphSet::merge(const SkPDFGlyphSet& usage) { |
| fBitSet.orBits(usage.fBitSet); |
| } |
| |
| void SkPDFGlyphSet::exportTo(SkTDArray<unsigned int>* glyphIDs) const { |
| fBitSet.exportTo(glyphIDs); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // class SkPDFGlyphSetMap |
| /////////////////////////////////////////////////////////////////////////////// |
| SkPDFGlyphSetMap::FontGlyphSetPair::FontGlyphSetPair(SkPDFFont* font, |
| SkPDFGlyphSet* glyphSet) |
| : fFont(font), |
| fGlyphSet(glyphSet) { |
| } |
| |
| SkPDFGlyphSetMap::SkPDFGlyphSetMap() { |
| } |
| |
| SkPDFGlyphSetMap::~SkPDFGlyphSetMap() { |
| reset(); |
| } |
| |
| void SkPDFGlyphSetMap::merge(const SkPDFGlyphSetMap& usage) { |
| for (int i = 0; i < usage.fMap.count(); ++i) { |
| SkPDFGlyphSet* myUsage = getGlyphSetForFont(usage.fMap[i].fFont); |
| myUsage->merge(*(usage.fMap[i].fGlyphSet)); |
| } |
| } |
| |
| void SkPDFGlyphSetMap::reset() { |
| for (int i = 0; i < fMap.count(); ++i) { |
| delete fMap[i].fGlyphSet; // Should not be nullptr. |
| } |
| fMap.reset(); |
| } |
| |
| void SkPDFGlyphSetMap::noteGlyphUsage(SkPDFFont* font, const uint16_t* glyphIDs, |
| int numGlyphs) { |
| SkPDFGlyphSet* subset = getGlyphSetForFont(font); |
| if (subset) { |
| subset->set(glyphIDs, numGlyphs); |
| } |
| } |
| |
| SkPDFGlyphSet* SkPDFGlyphSetMap::getGlyphSetForFont(SkPDFFont* font) { |
| int index = fMap.count(); |
| for (int i = 0; i < index; ++i) { |
| if (fMap[i].fFont == font) { |
| return fMap[i].fGlyphSet; |
| } |
| } |
| fMap.append(); |
| index = fMap.count() - 1; |
| fMap[index].fFont = font; |
| fMap[index].fGlyphSet = new SkPDFGlyphSet(); |
| return fMap[index].fGlyphSet; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // class SkPDFFont |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| /* Font subset design: It would be nice to be able to subset fonts |
| * (particularly type 3 fonts), but it's a lot of work and not a priority. |
| * |
| * Resources are canonicalized and uniqueified by pointer so there has to be |
| * some additional state indicating which subset of the font is used. It |
| * must be maintained at the page granularity and then combined at the document |
| * granularity. a) change SkPDFFont to fill in its state on demand, kind of |
| * like SkPDFGraphicState. b) maintain a per font glyph usage class in each |
| * page/pdf device. c) in the document, retrieve the per font glyph usage |
| * from each page and combine it and ask for a resource with that subset. |
| */ |
| |
| SkPDFFont::~SkPDFFont() {} |
| |
| SkTypeface* SkPDFFont::typeface() { |
| return fTypeface.get(); |
| } |
| |
| SkAdvancedTypefaceMetrics::FontType SkPDFFont::getType() { |
| return fFontType; |
| } |
| |
| bool SkPDFFont::canEmbed() const { |
| if (!fFontInfo.get()) { |
| SkASSERT(fFontType == SkAdvancedTypefaceMetrics::kOther_Font); |
| return true; |
| } |
| return (fFontInfo->fFlags & |
| SkAdvancedTypefaceMetrics::kNotEmbeddable_FontFlag) == 0; |
| } |
| |
| bool SkPDFFont::canSubset() const { |
| if (!fFontInfo.get()) { |
| SkASSERT(fFontType == SkAdvancedTypefaceMetrics::kOther_Font); |
| return true; |
| } |
| return (fFontInfo->fFlags & |
| SkAdvancedTypefaceMetrics::kNotSubsettable_FontFlag) == 0; |
| } |
| |
| bool SkPDFFont::hasGlyph(uint16_t id) { |
| return (id >= fFirstGlyphID && id <= fLastGlyphID) || id == 0; |
| } |
| |
| int SkPDFFont::glyphsToPDFFontEncoding(uint16_t* glyphIDs, int numGlyphs) { |
| // A font with multibyte glyphs will support all glyph IDs in a single font. |
| if (this->multiByteGlyphs()) { |
| return numGlyphs; |
| } |
| |
| for (int i = 0; i < numGlyphs; i++) { |
| if (glyphIDs[i] == 0) { |
| continue; |
| } |
| if (glyphIDs[i] < fFirstGlyphID || glyphIDs[i] > fLastGlyphID) { |
| return i; |
| } |
| glyphIDs[i] -= (fFirstGlyphID - 1); |
| } |
| |
| return numGlyphs; |
| } |
| |
| // static |
| SkPDFFont* SkPDFFont::GetFontResource(SkPDFCanon* canon, |
| SkTypeface* typeface, |
| uint16_t glyphID) { |
| SkASSERT(canon); |
| SkAutoResolveDefaultTypeface autoResolve(typeface); |
| typeface = autoResolve.get(); |
| const uint32_t fontID = typeface->uniqueID(); |
| |
| SkPDFFont* relatedFont; |
| if (SkPDFFont* pdfFont = canon->findFont(fontID, glyphID, &relatedFont)) { |
| return SkRef(pdfFont); |
| } |
| |
| sk_sp<const SkAdvancedTypefaceMetrics> fontMetrics; |
| SkPDFDict* relatedFontDescriptor = nullptr; |
| if (relatedFont) { |
| fontMetrics.reset(SkSafeRef(relatedFont->fontInfo())); |
| relatedFontDescriptor = relatedFont->getFontDescriptor(); |
| |
| // This only is to catch callers who pass invalid glyph ids. |
| // If glyph id is invalid, then we will create duplicate entries |
| // for TrueType fonts. |
| SkAdvancedTypefaceMetrics::FontType fontType = |
| fontMetrics.get() ? fontMetrics.get()->fType : |
| SkAdvancedTypefaceMetrics::kOther_Font; |
| |
| if (fontType == SkAdvancedTypefaceMetrics::kType1CID_Font || |
| fontType == SkAdvancedTypefaceMetrics::kTrueType_Font) { |
| return SkRef(relatedFont); |
| } |
| } else { |
| SkTypeface::PerGlyphInfo info; |
| info = SkTypeface::kGlyphNames_PerGlyphInfo; |
| info = SkTBitOr<SkTypeface::PerGlyphInfo>( |
| info, SkTypeface::kToUnicode_PerGlyphInfo); |
| #if !defined (SK_SFNTLY_SUBSETTER) |
| info = SkTBitOr<SkTypeface::PerGlyphInfo>( |
| info, SkTypeface::kHAdvance_PerGlyphInfo); |
| #endif |
| fontMetrics.reset( |
| typeface->getAdvancedTypefaceMetrics(info, nullptr, 0)); |
| #if defined (SK_SFNTLY_SUBSETTER) |
| if (fontMetrics.get() && |
| fontMetrics->fType != SkAdvancedTypefaceMetrics::kTrueType_Font) { |
| // Font does not support subsetting, get new info with advance. |
| info = SkTBitOr<SkTypeface::PerGlyphInfo>( |
| info, SkTypeface::kHAdvance_PerGlyphInfo); |
| fontMetrics.reset( |
| typeface->getAdvancedTypefaceMetrics(info, nullptr, 0)); |
| } |
| #endif |
| } |
| |
| SkPDFFont* font = SkPDFFont::Create(canon, fontMetrics.get(), typeface, |
| glyphID, relatedFontDescriptor); |
| canon->addFont(font, fontID, font->fFirstGlyphID); |
| return font; |
| } |
| |
| SkPDFFont* SkPDFFont::getFontSubset(const SkPDFGlyphSet*) { |
| return nullptr; // Default: no support. |
| } |
| |
| SkPDFFont::SkPDFFont(const SkAdvancedTypefaceMetrics* info, |
| SkTypeface* typeface, |
| SkPDFDict* relatedFontDescriptor) |
| : SkPDFDict("Font") |
| , fTypeface(ref_or_default(typeface)) |
| , fFirstGlyphID(1) |
| , fLastGlyphID(info ? info->fLastGlyphID : 0) |
| , fFontInfo(SkSafeRef(info)) |
| , fDescriptor(SkSafeRef(relatedFontDescriptor)) { |
| if (info == nullptr || |
| info->fFlags & SkAdvancedTypefaceMetrics::kMultiMaster_FontFlag) { |
| fFontType = SkAdvancedTypefaceMetrics::kOther_Font; |
| } else { |
| fFontType = info->fType; |
| } |
| } |
| |
| // static |
| SkPDFFont* SkPDFFont::Create(SkPDFCanon* canon, |
| const SkAdvancedTypefaceMetrics* info, |
| SkTypeface* typeface, |
| uint16_t glyphID, |
| SkPDFDict* relatedFontDescriptor) { |
| SkAdvancedTypefaceMetrics::FontType type = |
| info ? info->fType : SkAdvancedTypefaceMetrics::kOther_Font; |
| |
| if (info && (info->fFlags & SkAdvancedTypefaceMetrics::kMultiMaster_FontFlag)) { |
| return new SkPDFType3Font(info, typeface, glyphID); |
| } |
| if (type == SkAdvancedTypefaceMetrics::kType1CID_Font || |
| type == SkAdvancedTypefaceMetrics::kTrueType_Font) { |
| SkASSERT(relatedFontDescriptor == nullptr); |
| return new SkPDFType0Font(info, typeface); |
| } |
| if (type == SkAdvancedTypefaceMetrics::kType1_Font) { |
| return new SkPDFType1Font(info, typeface, glyphID, relatedFontDescriptor); |
| } |
| |
| SkASSERT(type == SkAdvancedTypefaceMetrics::kCFF_Font || |
| type == SkAdvancedTypefaceMetrics::kOther_Font); |
| |
| return new SkPDFType3Font(info, typeface, glyphID); |
| } |
| |
| const SkAdvancedTypefaceMetrics* SkPDFFont::fontInfo() { |
| return fFontInfo.get(); |
| } |
| |
| void SkPDFFont::setFontInfo(const SkAdvancedTypefaceMetrics* info) { |
| if (info == nullptr || info == fFontInfo.get()) { |
| return; |
| } |
| fFontInfo.reset(info); |
| SkSafeRef(info); |
| } |
| |
| uint16_t SkPDFFont::firstGlyphID() const { |
| return fFirstGlyphID; |
| } |
| |
| uint16_t SkPDFFont::lastGlyphID() const { |
| return fLastGlyphID; |
| } |
| |
| void SkPDFFont::setLastGlyphID(uint16_t glyphID) { |
| fLastGlyphID = glyphID; |
| } |
| |
| SkPDFDict* SkPDFFont::getFontDescriptor() { |
| return fDescriptor.get(); |
| } |
| |
| void SkPDFFont::setFontDescriptor(SkPDFDict* descriptor) { |
| fDescriptor.reset(descriptor); |
| SkSafeRef(descriptor); |
| } |
| |
| bool SkPDFFont::addCommonFontDescriptorEntries(int16_t defaultWidth) { |
| if (fDescriptor.get() == nullptr) { |
| return false; |
| } |
| |
| const uint16_t emSize = fFontInfo->fEmSize; |
| |
| fDescriptor->insertName("FontName", fFontInfo->fFontName); |
| fDescriptor->insertInt("Flags", fFontInfo->fStyle | kPdfSymbolic); |
| fDescriptor->insertScalar("Ascent", |
| scaleFromFontUnits(fFontInfo->fAscent, emSize)); |
| fDescriptor->insertScalar("Descent", |
| scaleFromFontUnits(fFontInfo->fDescent, emSize)); |
| fDescriptor->insertScalar("StemV", |
| scaleFromFontUnits(fFontInfo->fStemV, emSize)); |
| |
| fDescriptor->insertScalar("CapHeight", |
| scaleFromFontUnits(fFontInfo->fCapHeight, emSize)); |
| fDescriptor->insertInt("ItalicAngle", fFontInfo->fItalicAngle); |
| fDescriptor->insertObject( |
| "FontBBox", makeFontBBox(fFontInfo->fBBox, fFontInfo->fEmSize)); |
| |
| if (defaultWidth > 0) { |
| fDescriptor->insertScalar("MissingWidth", |
| scaleFromFontUnits(defaultWidth, emSize)); |
| } |
| return true; |
| } |
| |
| void SkPDFFont::adjustGlyphRangeForSingleByteEncoding(uint16_t glyphID) { |
| // Single byte glyph encoding supports a max of 255 glyphs. |
| fFirstGlyphID = glyphID - (glyphID - 1) % 255; |
| if (fLastGlyphID > fFirstGlyphID + 255 - 1) { |
| fLastGlyphID = fFirstGlyphID + 255 - 1; |
| } |
| } |
| |
| void SkPDFFont::populateToUnicodeTable(const SkPDFGlyphSet* subset) { |
| if (fFontInfo == nullptr || fFontInfo->fGlyphToUnicode.begin() == nullptr) { |
| return; |
| } |
| this->insertObjRef("ToUnicode", |
| generate_tounicode_cmap(fFontInfo->fGlyphToUnicode, |
| subset, |
| multiByteGlyphs(), |
| firstGlyphID(), |
| lastGlyphID())); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // class SkPDFType0Font |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkPDFType0Font::SkPDFType0Font(const SkAdvancedTypefaceMetrics* info, SkTypeface* typeface) |
| : SkPDFFont(info, typeface, nullptr) { |
| SkDEBUGCODE(fPopulated = false); |
| if (!canSubset()) { |
| this->populate(nullptr); |
| } |
| } |
| |
| SkPDFType0Font::~SkPDFType0Font() {} |
| |
| SkPDFFont* SkPDFType0Font::getFontSubset(const SkPDFGlyphSet* subset) { |
| if (!canSubset()) { |
| return nullptr; |
| } |
| SkPDFType0Font* newSubset = new SkPDFType0Font(fontInfo(), typeface()); |
| newSubset->populate(subset); |
| return newSubset; |
| } |
| |
| #ifdef SK_DEBUG |
| void SkPDFType0Font::emitObject(SkWStream* stream, |
| const SkPDFObjNumMap& objNumMap, |
| const SkPDFSubstituteMap& substitutes) const { |
| SkASSERT(fPopulated); |
| return INHERITED::emitObject(stream, objNumMap, substitutes); |
| } |
| #endif |
| |
| bool SkPDFType0Font::populate(const SkPDFGlyphSet* subset) { |
| insertName("Subtype", "Type0"); |
| insertName("BaseFont", fontInfo()->fFontName); |
| insertName("Encoding", "Identity-H"); |
| |
| sk_sp<SkPDFCIDFont> newCIDFont( |
| new SkPDFCIDFont(fontInfo(), typeface(), subset)); |
| auto descendantFonts = sk_make_sp<SkPDFArray>(); |
| descendantFonts->appendObjRef(std::move(newCIDFont)); |
| this->insertObject("DescendantFonts", std::move(descendantFonts)); |
| |
| this->populateToUnicodeTable(subset); |
| |
| SkDEBUGCODE(fPopulated = true); |
| return true; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // class SkPDFCIDFont |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkPDFCIDFont::SkPDFCIDFont(const SkAdvancedTypefaceMetrics* info, |
| SkTypeface* typeface, |
| const SkPDFGlyphSet* subset) |
| : SkPDFFont(info, typeface, nullptr) { |
| this->populate(subset); |
| } |
| |
| SkPDFCIDFont::~SkPDFCIDFont() {} |
| |
| bool SkPDFCIDFont::addFontDescriptor(int16_t defaultWidth, |
| const SkTDArray<uint32_t>* subset) { |
| auto descriptor = sk_make_sp<SkPDFDict>("FontDescriptor"); |
| setFontDescriptor(descriptor.get()); |
| if (!addCommonFontDescriptorEntries(defaultWidth)) { |
| this->insertObjRef("FontDescriptor", std::move(descriptor)); |
| return false; |
| } |
| SkASSERT(this->canEmbed()); |
| |
| switch (getType()) { |
| case SkAdvancedTypefaceMetrics::kTrueType_Font: { |
| size_t fontSize = 0; |
| #if defined(SK_SFNTLY_SUBSETTER) |
| if (this->canSubset()) { |
| sk_sp<SkPDFStream> fontStream; |
| SkPDFStream* rawStream = nullptr; |
| fontSize = get_subset_font_stream(fontInfo()->fFontName.c_str(), |
| typeface(), |
| *subset, |
| &rawStream); |
| if (rawStream) { |
| fontStream.reset(rawStream); |
| fontStream->insertInt("Length1", fontSize); |
| descriptor->insertObjRef("FontFile2", std::move(fontStream)); |
| break; |
| } |
| } |
| #endif |
| sk_sp<SkPDFSharedStream> fontStream; |
| SkAutoTDelete<SkStreamAsset> fontData( |
| this->typeface()->openStream(nullptr)); |
| SkASSERT(fontData); |
| fontSize = fontData->getLength(); |
| SkASSERT(fontSize > 0); |
| fontStream.reset(new SkPDFSharedStream(fontData.release())); |
| fontStream->dict()->insertInt("Length1", fontSize); |
| descriptor->insertObjRef("FontFile2", std::move(fontStream)); |
| break; |
| } |
| case SkAdvancedTypefaceMetrics::kCFF_Font: |
| case SkAdvancedTypefaceMetrics::kType1CID_Font: { |
| sk_sp<SkPDFSharedStream> fontStream( |
| new SkPDFSharedStream(this->typeface()->openStream(nullptr))); |
| |
| if (getType() == SkAdvancedTypefaceMetrics::kCFF_Font) { |
| fontStream->dict()->insertName("Subtype", "Type1C"); |
| } else { |
| fontStream->dict()->insertName("Subtype", "CIDFontType0c"); |
| } |
| descriptor->insertObjRef("FontFile3", std::move(fontStream)); |
| break; |
| } |
| default: |
| SkASSERT(false); |
| } |
| this->insertObjRef("FontDescriptor", std::move(descriptor)); |
| return true; |
| } |
| |
| bool SkPDFCIDFont::populate(const SkPDFGlyphSet* subset) { |
| // Generate new font metrics with advance info for true type fonts. |
| if (fontInfo()->fType == SkAdvancedTypefaceMetrics::kTrueType_Font) { |
| // Generate glyph id array. |
| SkTDArray<uint32_t> glyphIDs; |
| if (subset) { |
| // Always include glyph 0. |
| if (!subset->has(0)) { |
| glyphIDs.push(0); |
| } |
| subset->exportTo(&glyphIDs); |
| } |
| |
| SkTypeface::PerGlyphInfo info; |
| info = SkTypeface::kGlyphNames_PerGlyphInfo; |
| info = SkTBitOr<SkTypeface::PerGlyphInfo>( |
| info, SkTypeface::kHAdvance_PerGlyphInfo); |
| uint32_t* glyphs = (glyphIDs.count() == 0) ? nullptr : glyphIDs.begin(); |
| uint32_t glyphsCount = glyphs ? glyphIDs.count() : 0; |
| sk_sp<const SkAdvancedTypefaceMetrics> fontMetrics( |
| typeface()->getAdvancedTypefaceMetrics(info, glyphs, glyphsCount)); |
| setFontInfo(fontMetrics.get()); |
| addFontDescriptor(0, &glyphIDs); |
| } else { |
| // Other CID fonts |
| addFontDescriptor(0, nullptr); |
| } |
| |
| insertName("BaseFont", fontInfo()->fFontName); |
| |
| if (getType() == SkAdvancedTypefaceMetrics::kType1CID_Font) { |
| insertName("Subtype", "CIDFontType0"); |
| } else if (getType() == SkAdvancedTypefaceMetrics::kTrueType_Font) { |
| insertName("Subtype", "CIDFontType2"); |
| insertName("CIDToGIDMap", "Identity"); |
| } else { |
| SkASSERT(false); |
| } |
| |
| auto sysInfo = sk_make_sp<SkPDFDict>(); |
| sysInfo->insertString("Registry", "Adobe"); |
| sysInfo->insertString("Ordering", "Identity"); |
| sysInfo->insertInt("Supplement", 0); |
| this->insertObject("CIDSystemInfo", std::move(sysInfo)); |
| |
| if (fontInfo()->fGlyphWidths.get()) { |
| int16_t defaultWidth = 0; |
| sk_sp<SkPDFArray> widths( |
| composeAdvanceData(fontInfo()->fGlyphWidths.get(), |
| fontInfo()->fEmSize, &appendWidth, |
| &defaultWidth)); |
| if (widths->size()) |
| this->insertObject("W", std::move(widths)); |
| if (defaultWidth != 0) { |
| this->insertScalar( |
| "DW", |
| scaleFromFontUnits(defaultWidth, fontInfo()->fEmSize)); |
| } |
| } |
| if (fontInfo()->fVerticalMetrics.get()) { |
| struct SkAdvancedTypefaceMetrics::VerticalMetric defaultAdvance; |
| defaultAdvance.fVerticalAdvance = 0; |
| defaultAdvance.fOriginXDisp = 0; |
| defaultAdvance.fOriginYDisp = 0; |
| sk_sp<SkPDFArray> advances( |
| composeAdvanceData(fontInfo()->fVerticalMetrics.get(), |
| fontInfo()->fEmSize, &appendVerticalAdvance, |
| &defaultAdvance)); |
| if (advances->size()) |
| this->insertObject("W2", std::move(advances)); |
| if (defaultAdvance.fVerticalAdvance || |
| defaultAdvance.fOriginXDisp || |
| defaultAdvance.fOriginYDisp) { |
| auto array = sk_make_sp<SkPDFArray>(); |
| appendVerticalAdvance(defaultAdvance, |
| fontInfo()->fEmSize, |
| array.get()); |
| this->insertObject("DW2", std::move(array)); |
| } |
| } |
| |
| return true; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // class SkPDFType1Font |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkPDFType1Font::SkPDFType1Font(const SkAdvancedTypefaceMetrics* info, |
| SkTypeface* typeface, |
| uint16_t glyphID, |
| SkPDFDict* relatedFontDescriptor) |
| : SkPDFFont(info, typeface, relatedFontDescriptor) { |
| this->populate(glyphID); |
| } |
| |
| SkPDFType1Font::~SkPDFType1Font() {} |
| |
| bool SkPDFType1Font::addFontDescriptor(int16_t defaultWidth) { |
| if (SkPDFDict* descriptor = getFontDescriptor()) { |
| this->insertObjRef("FontDescriptor", |
| sk_ref_sp(descriptor)); |
| return true; |
| } |
| |
| auto descriptor = sk_make_sp<SkPDFDict>("FontDescriptor"); |
| setFontDescriptor(descriptor.get()); |
| |
| int ttcIndex; |
| size_t header SK_INIT_TO_AVOID_WARNING; |
| size_t data SK_INIT_TO_AVOID_WARNING; |
| size_t trailer SK_INIT_TO_AVOID_WARNING; |
| SkAutoTDelete<SkStream> rawFontData(typeface()->openStream(&ttcIndex)); |
| sk_sp<SkData> fontData(handle_type1_stream(rawFontData.get(), &header, |
| &data, &trailer)); |
| if (fontData.get() == nullptr) { |
| return false; |
| } |
| SkASSERT(this->canEmbed()); |
| auto fontStream = sk_make_sp<SkPDFStream>(fontData.get()); |
| fontStream->insertInt("Length1", header); |
| fontStream->insertInt("Length2", data); |
| fontStream->insertInt("Length3", trailer); |
| descriptor->insertObjRef("FontFile", std::move(fontStream)); |
| |
| this->insertObjRef("FontDescriptor", std::move(descriptor)); |
| |
| return addCommonFontDescriptorEntries(defaultWidth); |
| } |
| |
| bool SkPDFType1Font::populate(int16_t glyphID) { |
| SkASSERT(!fontInfo()->fVerticalMetrics.get()); |
| SkASSERT(fontInfo()->fGlyphWidths.get()); |
| |
| adjustGlyphRangeForSingleByteEncoding(glyphID); |
| |
| int16_t defaultWidth = 0; |
| const SkAdvancedTypefaceMetrics::WidthRange* widthRangeEntry = nullptr; |
| const SkAdvancedTypefaceMetrics::WidthRange* widthEntry; |
| for (widthEntry = fontInfo()->fGlyphWidths.get(); |
| widthEntry != nullptr; |
| widthEntry = widthEntry->fNext.get()) { |
| switch (widthEntry->fType) { |
| case SkAdvancedTypefaceMetrics::WidthRange::kDefault: |
| defaultWidth = widthEntry->fAdvance[0]; |
| break; |
| case SkAdvancedTypefaceMetrics::WidthRange::kRun: |
| SkASSERT(false); |
| break; |
| case SkAdvancedTypefaceMetrics::WidthRange::kRange: |
| SkASSERT(widthRangeEntry == nullptr); |
| widthRangeEntry = widthEntry; |
| break; |
| } |
| } |
| |
| if (!addFontDescriptor(defaultWidth)) { |
| return false; |
| } |
| |
| insertName("Subtype", "Type1"); |
| insertName("BaseFont", fontInfo()->fFontName); |
| |
| addWidthInfoFromRange(defaultWidth, widthRangeEntry); |
| |
| |
| auto encDiffs = sk_make_sp<SkPDFArray>(); |
| encDiffs->reserve(lastGlyphID() - firstGlyphID() + 2); |
| encDiffs->appendInt(1); |
| for (int gID = firstGlyphID(); gID <= lastGlyphID(); gID++) { |
| encDiffs->appendName(fontInfo()->fGlyphNames->get()[gID].c_str()); |
| } |
| |
| auto encoding = sk_make_sp<SkPDFDict>("Encoding"); |
| encoding->insertObject("Differences", std::move(encDiffs)); |
| this->insertObject("Encoding", std::move(encoding)); |
| return true; |
| } |
| |
| void SkPDFType1Font::addWidthInfoFromRange( |
| int16_t defaultWidth, |
| const SkAdvancedTypefaceMetrics::WidthRange* widthRangeEntry) { |
| auto widthArray = sk_make_sp<SkPDFArray>(); |
| int firstChar = 0; |
| if (widthRangeEntry) { |
| const uint16_t emSize = fontInfo()->fEmSize; |
| int startIndex = firstGlyphID() - widthRangeEntry->fStartId; |
| int endIndex = startIndex + lastGlyphID() - firstGlyphID() + 1; |
| if (startIndex < 0) |
| startIndex = 0; |
| if (endIndex > widthRangeEntry->fAdvance.count()) |
| endIndex = widthRangeEntry->fAdvance.count(); |
| if (widthRangeEntry->fStartId == 0) { |
| appendWidth(widthRangeEntry->fAdvance[0], emSize, widthArray.get()); |
| } else { |
| firstChar = startIndex + widthRangeEntry->fStartId; |
| } |
| for (int i = startIndex; i < endIndex; i++) { |
| appendWidth(widthRangeEntry->fAdvance[i], emSize, widthArray.get()); |
| } |
| } else { |
| appendWidth(defaultWidth, 1000, widthArray.get()); |
| } |
| this->insertInt("FirstChar", firstChar); |
| this->insertInt("LastChar", firstChar + widthArray->size() - 1); |
| this->insertObject("Widths", std::move(widthArray)); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // class SkPDFType3Font |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkPDFType3Font::SkPDFType3Font(const SkAdvancedTypefaceMetrics* info, |
| SkTypeface* typeface, |
| uint16_t glyphID) |
| : SkPDFFont(info, typeface, nullptr) { |
| this->populate(glyphID); |
| } |
| |
| SkPDFType3Font::~SkPDFType3Font() {} |
| |
| bool SkPDFType3Font::populate(uint16_t glyphID) { |
| SkPaint paint; |
| paint.setTypeface(typeface()); |
| paint.setTextSize(1000); |
| const SkSurfaceProps props(0, kUnknown_SkPixelGeometry); |
| SkAutoGlyphCache autoCache(paint, &props, nullptr); |
| SkGlyphCache* cache = autoCache.getCache(); |
| // If fLastGlyphID isn't set (because there is not fFontInfo), look it up. |
| if (lastGlyphID() == 0) { |
| setLastGlyphID(cache->getGlyphCount() - 1); |
| } |
| |
| adjustGlyphRangeForSingleByteEncoding(glyphID); |
| |
| insertName("Subtype", "Type3"); |
| // Flip about the x-axis and scale by 1/1000. |
| SkMatrix fontMatrix; |
| fontMatrix.setScale(SkScalarInvert(1000), -SkScalarInvert(1000)); |
| this->insertObject("FontMatrix", SkPDFUtils::MatrixToArray(fontMatrix)); |
| |
| auto charProcs = sk_make_sp<SkPDFDict>(); |
| auto encoding = sk_make_sp<SkPDFDict>("Encoding"); |
| |
| auto encDiffs = sk_make_sp<SkPDFArray>(); |
| encDiffs->reserve(lastGlyphID() - firstGlyphID() + 2); |
| encDiffs->appendInt(1); |
| |
| auto widthArray = sk_make_sp<SkPDFArray>(); |
| |
| SkIRect bbox = SkIRect::MakeEmpty(); |
| for (int gID = firstGlyphID(); gID <= lastGlyphID(); gID++) { |
| SkString characterName; |
| characterName.printf("gid%d", gID); |
| encDiffs->appendName(characterName.c_str()); |
| |
| const SkGlyph& glyph = cache->getGlyphIDMetrics(gID); |
| widthArray->appendScalar(SkFixedToScalar(glyph.fAdvanceX)); |
| SkIRect glyphBBox = SkIRect::MakeXYWH(glyph.fLeft, glyph.fTop, |
| glyph.fWidth, glyph.fHeight); |
| bbox.join(glyphBBox); |
| |
| SkDynamicMemoryWStream content; |
| setGlyphWidthAndBoundingBox(SkFixedToScalar(glyph.fAdvanceX), glyphBBox, |
| &content); |
| const SkPath* path = cache->findPath(glyph); |
| if (path) { |
| SkPDFUtils::EmitPath(*path, paint.getStyle(), &content); |
| SkPDFUtils::PaintPath(paint.getStyle(), path->getFillType(), |
| &content); |
| } |
| SkAutoTDelete<SkMemoryStream> glyphStream(new SkMemoryStream()); |
| glyphStream->setData(content.copyToData())->unref(); |
| |
| charProcs->insertObjRef( |
| characterName, sk_make_sp<SkPDFStream>(glyphStream.get())); |
| } |
| |
| encoding->insertObject("Differences", std::move(encDiffs)); |
| |
| this->insertObject("CharProcs", std::move(charProcs)); |
| this->insertObject("Encoding", std::move(encoding)); |
| |
| this->insertObject("FontBBox", makeFontBBox(bbox, 1000)); |
| this->insertInt("FirstChar", 1); |
| this->insertInt("LastChar", lastGlyphID() - firstGlyphID() + 1); |
| this->insertObject("Widths", std::move(widthArray)); |
| this->insertName("CIDToGIDMap", "Identity"); |
| |
| this->populateToUnicodeTable(nullptr); |
| return true; |
| } |
| |
| SkPDFFont::Match SkPDFFont::IsMatch(SkPDFFont* existingFont, |
| uint32_t existingFontID, |
| uint16_t existingGlyphID, |
| uint32_t searchFontID, |
| uint16_t searchGlyphID) { |
| if (existingFontID != searchFontID) { |
| return SkPDFFont::kNot_Match; |
| } |
| if (existingGlyphID == 0 || searchGlyphID == 0) { |
| return SkPDFFont::kExact_Match; |
| } |
| if (existingFont != nullptr) { |
| return (existingFont->fFirstGlyphID <= searchGlyphID && |
| searchGlyphID <= existingFont->fLastGlyphID) |
| ? SkPDFFont::kExact_Match |
| : SkPDFFont::kRelated_Match; |
| } |
| return (existingGlyphID == searchGlyphID) ? SkPDFFont::kExact_Match |
| : SkPDFFont::kRelated_Match; |
| } |
| |
| // Since getAdvancedTypefaceMetrics is expensive, cache the result. |
| bool SkPDFFont::CanEmbedTypeface(SkTypeface* typeface, SkPDFCanon* canon) { |
| SkAutoResolveDefaultTypeface face(typeface); |
| uint32_t id = face->uniqueID(); |
| if (bool* value = canon->fCanEmbedTypeface.find(id)) { |
| return *value; |
| } |
| bool canEmbed = true; |
| sk_sp<const SkAdvancedTypefaceMetrics> fontMetrics( |
| face->getAdvancedTypefaceMetrics( |
| SkTypeface::kNo_PerGlyphInfo, nullptr, 0)); |
| if (fontMetrics) { |
| canEmbed = !SkToBool( |
| fontMetrics->fFlags & |
| SkAdvancedTypefaceMetrics::kNotEmbeddable_FontFlag); |
| } |
| return *canon->fCanEmbedTypeface.set(id, canEmbed); |
| } |
| |
| void SkPDFFont::drop() { |
| fTypeface = nullptr; |
| fFontInfo = nullptr; |
| fDescriptor = nullptr; |
| this->SkPDFDict::drop(); |
| } |