コード例 #1
0
void SkScalerContext_DW::generateFontMetrics(SkPaint::FontMetrics* metrics) {
    if (NULL == metrics) {
        return;
    }

    sk_bzero(metrics, sizeof(*metrics));

    DWRITE_FONT_METRICS dwfm;
    if (DWRITE_MEASURING_MODE_GDI_CLASSIC == fMeasuringMode ||
        DWRITE_MEASURING_MODE_GDI_NATURAL == fMeasuringMode)
    {
        fTypeface->fDWriteFontFace->GetGdiCompatibleMetrics(
             fTextSizeRender,
             1.0f, // pixelsPerDip
             &fXform,
             &dwfm);
    } else {
        fTypeface->fDWriteFontFace->GetMetrics(&dwfm);
    }

    SkScalar upem = SkIntToScalar(dwfm.designUnitsPerEm);

    metrics->fAscent = -fTextSizeRender * SkIntToScalar(dwfm.ascent) / upem;
    metrics->fDescent = fTextSizeRender * SkIntToScalar(dwfm.descent) / upem;
    metrics->fLeading = fTextSizeRender * SkIntToScalar(dwfm.lineGap) / upem;
    metrics->fXHeight = fTextSizeRender * SkIntToScalar(dwfm.xHeight) / upem;
    metrics->fUnderlineThickness = fTextSizeRender * SkIntToScalar(dwfm.underlineThickness) / upem;
    metrics->fUnderlinePosition = -(fTextSizeRender * SkIntToScalar(dwfm.underlinePosition) / upem);

    metrics->fFlags |= SkPaint::FontMetrics::kUnderlineThinknessIsValid_Flag;
    metrics->fFlags |= SkPaint::FontMetrics::kUnderlinePositionIsValid_Flag;

    if (fTypeface->fDWriteFontFace1.get()) {
        DWRITE_FONT_METRICS1 dwfm1;
        fTypeface->fDWriteFontFace1->GetMetrics(&dwfm1);
        metrics->fTop = -fTextSizeRender * SkIntToScalar(dwfm1.glyphBoxTop) / upem;
        metrics->fBottom = -fTextSizeRender * SkIntToScalar(dwfm1.glyphBoxBottom) / upem;
        metrics->fXMin = fTextSizeRender * SkIntToScalar(dwfm1.glyphBoxLeft) / upem;
        metrics->fXMax = fTextSizeRender * SkIntToScalar(dwfm1.glyphBoxRight) / upem;

        metrics->fMaxCharWidth = metrics->fXMax - metrics->fXMin;
    } else {
        AutoTDWriteTable<SkOTTableHead> head(fTypeface->fDWriteFontFace.get());
        if (head.fExists &&
            head.fSize >= sizeof(SkOTTableHead) &&
            head->version == SkOTTableHead::version1)
        {
            metrics->fTop = -fTextSizeRender * (int16_t)SkEndian_SwapBE16(head->yMax) / upem;
            metrics->fBottom = -fTextSizeRender * (int16_t)SkEndian_SwapBE16(head->yMin) / upem;
            metrics->fXMin = fTextSizeRender * (int16_t)SkEndian_SwapBE16(head->xMin) / upem;
            metrics->fXMax = fTextSizeRender * (int16_t)SkEndian_SwapBE16(head->xMax) / upem;

            metrics->fMaxCharWidth = metrics->fXMax - metrics->fXMin;
        } else {
            metrics->fTop = metrics->fAscent;
            metrics->fBottom = metrics->fDescent;
        }
    }
}
コード例 #2
0
static void TypefaceStyle_test(skiatest::Reporter* reporter,
                               uint16_t weight, uint16_t width, SkData* data)
{
    sk_sp<SkData> dataCopy;
    SkData* dataToUse = data;
    if (!dataToUse->unique()) {
        dataCopy = SkData::MakeWithCopy(data->data(), data->size());
        dataToUse = dataCopy.get();
    }
    SkSFNTHeader* sfntHeader = static_cast<SkSFNTHeader*>(dataToUse->writable_data());

    SkSFNTHeader::TableDirectoryEntry* tableEntry =
        SkTAfter<SkSFNTHeader::TableDirectoryEntry>(sfntHeader);
    SkSFNTHeader::TableDirectoryEntry* os2TableEntry = nullptr;
    int numTables = SkEndian_SwapBE16(sfntHeader->numTables);
    for (int tableEntryIndex = 0; tableEntryIndex < numTables; ++tableEntryIndex) {
        if (SkOTTableOS2::TAG == tableEntry[tableEntryIndex].tag) {
            os2TableEntry = tableEntry + tableEntryIndex;
            break;
        }
    }
    SkASSERT_RELEASE(os2TableEntry);

    size_t os2TableOffset = SkEndian_SwapBE32(os2TableEntry->offset);
    SkOTTableOS2_V0* os2Table = SkTAddOffset<SkOTTableOS2_V0>(sfntHeader, os2TableOffset);
    os2Table->usWeightClass.value = SkEndian_SwapBE16(weight);
    using WidthType = SkOTTableOS2_V0::WidthClass::Value;
    os2Table->usWidthClass.value = static_cast<WidthType>(SkEndian_SwapBE16(width));

    sk_sp<SkTypeface> newTypeface(SkTypeface::MakeFromStream(new SkMemoryStream(dataToUse)));
    SkASSERT_RELEASE(newTypeface);

    SkFontStyle newStyle = newTypeface->fontStyle();

    //printf("%d, %f\n", weight, (newStyle.weight() - (float)0x7FFF) / (float)0x7FFF);
    //printf("%d, %f\n", width , (newStyle.width()  - (float)0x7F)   / (float)0x7F);
    //printf("%d, %d\n", weight, newStyle.weight());
    //printf("%d, %d\n", width , newStyle.width());

    // Some back-ends (CG, GDI, DW) support OS/2 version A which uses 0 - 10 (but all differently).
    REPORTER_ASSERT(reporter,
                    newStyle.weight() == weight ||
                    (weight <=   10 && newStyle.weight() == 100 * weight) ||
                    (weight ==    4 && newStyle.weight() == 350) ||  // GDI weirdness
                    (weight ==    5 && newStyle.weight() == 400) ||  // GDI weirdness
                    (weight ==    0 && newStyle.weight() ==   1) ||  // DW weirdness
                    (weight == 1000 && newStyle.weight() == 999)     // DW weirdness
    );

    // Some back-ends (GDI) don't support width, ensure these always report 'medium'.
    REPORTER_ASSERT(reporter,
                    newStyle.width() == width ||
                    newStyle.width() == 5);
}
コード例 #3
0
/** Return the number of tables, or if this is a TTC (collection), return the
    number of tables in the first element of the collection. In either case,
    if offsetToDir is not-null, set it to the offset to the beginning of the
    table headers (SkSFNTDirEntry), relative to the start of the stream.

    On an error, return 0 for number of tables, and ignore offsetToDir
 */
static int count_tables(SkStream* stream, size_t* offsetToDir = NULL) {
    SkSharedTTHeader shared;
    if (stream->read(&shared, sizeof(shared)) != sizeof(shared)) {
        return 0;
    }

    // by default, SkSFNTHeader is at the start of the stream
    size_t offset = 0;

    // if we're really a collection, the first 4-bytes will be 'ttcf'
    uint32_t tag = SkEndian_SwapBE32(shared.fCollection.fTag);
    if (SkSetFourByteTag('t', 't', 'c', 'f') == tag) {
        if (shared.fCollection.fNumOffsets == 0) {
            return 0;
        }
        // this is the offset to the first local SkSFNTHeader
        offset = SkEndian_SwapBE32(shared.fCollection.fOffset0);
        stream->rewind();
        if (stream->skip(offset) != offset) {
            return 0;
        }
        if (stream->read(&shared, sizeof(shared)) != sizeof(shared)) {
            return 0;
        }
    }

    if (offsetToDir) {
        // add the size of the header, so we will point to the DirEntries
        *offsetToDir = offset + sizeof(SkSFNTHeader);
    }
    return SkEndian_SwapBE16(shared.fSingle.fNumTables);
}
static SkUnichar SkUTF16BE_NextUnichar(const uint16_t** srcPtr) {
    SkASSERT(srcPtr && *srcPtr);

    const uint16_t* src = *srcPtr;
    SkUnichar c = SkEndian_SwapBE16(*src++);

    SkASSERT(!SkUTF16_IsLowSurrogate(c));
    if (SkUTF16_IsHighSurrogate(c)) {
        unsigned c2 = SkEndian_SwapBE16(*src++);
        SkASSERT(SkUTF16_IsLowSurrogate(c2));

        c = (c << 10) + c2 + (0x10000 - (0xD800 << 10) - 0xDC00);
    }
    *srcPtr = src;
    return c;
}
コード例 #5
0
ファイル: SkFontStream.cpp プロジェクト: MIPS/external-skia
/** Return the number of tables, or if this is a TTC (collection), return the
    number of tables in the first element of the collection. In either case,
    if offsetToDir is not-null, set it to the offset to the beginning of the
    table headers (SkSFNTDirEntry), relative to the start of the stream.

    On an error, return 0 for number of tables, and ignore offsetToDir
 */
static int count_tables(SkStream* stream, int ttcIndex, size_t* offsetToDir) {
    SkASSERT(ttcIndex >= 0);

    SkAutoSMalloc<1024> storage(sizeof(SkSharedTTHeader));
    SkSharedTTHeader* header = (SkSharedTTHeader*)storage.get();

    if (!read(stream, header, sizeof(SkSharedTTHeader))) {
        return 0;
    }

    // by default, SkSFNTHeader is at the start of the stream
    size_t offset = 0;

    // if we're really a collection, the first 4-bytes will be 'ttcf'
    uint32_t tag = SkEndian_SwapBE32(header->fCollection.fTag);
    if (SkSetFourByteTag('t', 't', 'c', 'f') == tag) {
        unsigned count = SkEndian_SwapBE32(header->fCollection.fNumOffsets);
        if ((unsigned)ttcIndex >= count) {
            return 0;
        }

        if (ttcIndex > 0) { // need to read more of the shared header
            stream->rewind();
            size_t amount = sizeof(SkSharedTTHeader) + ttcIndex * sizeof(uint32_t);
            header = (SkSharedTTHeader*)storage.reset(amount);
            if (!read(stream, header, amount)) {
                return 0;
            }
        }
        // this is the offset to the local SkSFNTHeader
        offset = SkEndian_SwapBE32((&header->fCollection.fOffset0)[ttcIndex]);
        stream->rewind();
        if (!skip(stream, offset)) {
            return 0;
        }
        if (!read(stream, header, sizeof(SkSFNTHeader))) {
            return 0;
        }
    }

    if (offsetToDir) {
        // add the size of the header, so we will point to the DirEntries
        *offsetToDir = offset + sizeof(SkSFNTHeader);
    }
    return SkEndian_SwapBE16(header->fSingle.fNumTables);
}
コード例 #6
0
SkAdvancedTypefaceMetrics* DWriteFontTypeface::onGetAdvancedTypefaceMetrics(
        PerGlyphInfo perGlyphInfo,
        const uint32_t* glyphIDs,
        uint32_t glyphIDsCount) const {

    SkAdvancedTypefaceMetrics* info = nullptr;

    HRESULT hr = S_OK;

    const unsigned glyphCount = fDWriteFontFace->GetGlyphCount();

    DWRITE_FONT_METRICS dwfm;
    fDWriteFontFace->GetMetrics(&dwfm);

    info = new SkAdvancedTypefaceMetrics;
    info->fEmSize = dwfm.designUnitsPerEm;
    info->fLastGlyphID = SkToU16(glyphCount - 1);

    info->fAscent = SkToS16(dwfm.ascent);
    info->fDescent = SkToS16(dwfm.descent);
    info->fCapHeight = SkToS16(dwfm.capHeight);

    // SkAdvancedTypefaceMetrics::fFontName is in theory supposed to be
    // the PostScript name of the font. However, due to the way it is currently
    // used, it must actually be a family name.
    SkTScopedComPtr<IDWriteLocalizedStrings> familyNames;
    hr = fDWriteFontFamily->GetFamilyNames(&familyNames);

    UINT32 familyNameLen;
    hr = familyNames->GetStringLength(0, &familyNameLen);

    SkSMallocWCHAR familyName(familyNameLen+1);
    hr = familyNames->GetString(0, familyName.get(), familyNameLen+1);

    hr = sk_wchar_to_skstring(familyName.get(), familyNameLen, &info->fFontName);

    if (perGlyphInfo & kToUnicode_PerGlyphInfo) {
        populate_glyph_to_unicode(fDWriteFontFace.get(), glyphCount, &(info->fGlyphToUnicode));
    }

    DWRITE_FONT_FACE_TYPE fontType = fDWriteFontFace->GetType();
    if (fontType != DWRITE_FONT_FACE_TYPE_TRUETYPE &&
        fontType != DWRITE_FONT_FACE_TYPE_TRUETYPE_COLLECTION)
    {
        return info;
    }

    // Simulated fonts aren't really TrueType fonts.
    if (fDWriteFontFace->GetSimulations() == DWRITE_FONT_SIMULATIONS_NONE) {
        info->fType = SkAdvancedTypefaceMetrics::kTrueType_Font;
    }

    AutoTDWriteTable<SkOTTableHead> headTable(fDWriteFontFace.get());
    AutoTDWriteTable<SkOTTablePostScript> postTable(fDWriteFontFace.get());
    AutoTDWriteTable<SkOTTableHorizontalHeader> hheaTable(fDWriteFontFace.get());
    AutoTDWriteTable<SkOTTableOS2> os2Table(fDWriteFontFace.get());
    if (!headTable.fExists || !postTable.fExists || !hheaTable.fExists || !os2Table.fExists) {
        return info;
    }

    //There exist CJK fonts which set the IsFixedPitch and Monospace bits,
    //but have full width, latin half-width, and half-width kana.
    bool fixedWidth = (postTable->isFixedPitch &&
                      (1 == SkEndian_SwapBE16(hheaTable->numberOfHMetrics)));
    //Monospace
    if (fixedWidth) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kFixedPitch_Style;
    }
    //Italic
    if (os2Table->version.v0.fsSelection.field.Italic) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kItalic_Style;
    }
    //Serif
    using SerifStyle = SkPanose::Data::TextAndDisplay::SerifStyle;
    SerifStyle serifStyle = os2Table->version.v0.panose.data.textAndDisplay.bSerifStyle;
    if (SkPanose::FamilyType::TextAndDisplay == os2Table->version.v0.panose.bFamilyType) {
        if (SerifStyle::Cove == serifStyle ||
            SerifStyle::ObtuseCove == serifStyle ||
            SerifStyle::SquareCove == serifStyle ||
            SerifStyle::ObtuseSquareCove == serifStyle ||
            SerifStyle::Square == serifStyle ||
            SerifStyle::Thin == serifStyle ||
            SerifStyle::Bone == serifStyle ||
            SerifStyle::Exaggerated == serifStyle ||
            SerifStyle::Triangle == serifStyle)
        {
            info->fStyle |= SkAdvancedTypefaceMetrics::kSerif_Style;
        }
    //Script
    } else if (SkPanose::FamilyType::Script == os2Table->version.v0.panose.bFamilyType) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kScript_Style;
    }

    info->fItalicAngle = SkEndian_SwapBE32(postTable->italicAngle) >> 16;

    info->fBBox = SkIRect::MakeLTRB((int32_t)SkEndian_SwapBE16((uint16_t)headTable->xMin),
                                    (int32_t)SkEndian_SwapBE16((uint16_t)headTable->yMax),
                                    (int32_t)SkEndian_SwapBE16((uint16_t)headTable->xMax),
                                    (int32_t)SkEndian_SwapBE16((uint16_t)headTable->yMin));
    return info;
}
コード例 #7
0
ファイル: SkOTUtils.cpp プロジェクト: CodeSpeaker/gecko-dev
SkData* SkOTUtils::RenameFont(SkStream* fontData, const char* fontName, int fontNameLen) {

    // Get the sfnt header.
    SkSFNTHeader sfntHeader;
    if (fontData->read(&sfntHeader, sizeof(sfntHeader)) < sizeof(sfntHeader)) {
        return NULL;
    }

    // Find the existing 'name' table.
    int tableIndex;
    SkSFNTHeader::TableDirectoryEntry tableEntry;
    int numTables = SkEndian_SwapBE16(sfntHeader.numTables);
    for (tableIndex = 0; tableIndex < numTables; ++tableIndex) {
        if (fontData->read(&tableEntry, sizeof(tableEntry)) < sizeof(tableEntry)) {
            return NULL;
        }
        if (SkOTTableName::TAG == tableEntry.tag) {
            break;
        }
    }
    if (tableIndex == numTables) {
        return NULL;
    }

    if (!fontData->rewind()) {
        return NULL;
    }

    // The required 'name' record types: Family, Style, Unique, Full and PostScript.
    const SkOTTableName::Record::NameID::Predefined::Value namesToCreate[] = {
        SkOTTableName::Record::NameID::Predefined::FontFamilyName,
        SkOTTableName::Record::NameID::Predefined::FontSubfamilyName,
        SkOTTableName::Record::NameID::Predefined::UniqueFontIdentifier,
        SkOTTableName::Record::NameID::Predefined::FullFontName,
        SkOTTableName::Record::NameID::Predefined::PostscriptName,
    };
    const int namesCount = SK_ARRAY_COUNT(namesToCreate);

    // Copy the data, leaving out the old name table.
    // In theory, we could also remove the DSIG table if it exists.
    size_t nameTableLogicalSize = sizeof(SkOTTableName) + (namesCount * sizeof(SkOTTableName::Record)) + (fontNameLen * sizeof(wchar_t));
    size_t nameTablePhysicalSize = (nameTableLogicalSize + 3) & ~3; // Rounded up to a multiple of 4.

    size_t oldNameTablePhysicalSize = (SkEndian_SwapBE32(tableEntry.logicalLength) + 3) & ~3; // Rounded up to a multiple of 4.
    size_t oldNameTableOffset = SkEndian_SwapBE32(tableEntry.offset);

    //originalDataSize is the size of the original data without the name table.
    size_t originalDataSize = fontData->getLength() - oldNameTablePhysicalSize;
    size_t newDataSize = originalDataSize + nameTablePhysicalSize;

    SK_OT_BYTE* data = static_cast<SK_OT_BYTE*>(sk_malloc_throw(newDataSize));
    SkAutoTUnref<SkData> rewrittenFontData(SkData::NewFromMalloc(data, newDataSize));

    if (fontData->read(data, oldNameTableOffset) < oldNameTableOffset) {
        return NULL;
    }
    if (fontData->skip(oldNameTablePhysicalSize) < oldNameTablePhysicalSize) {
        return NULL;
    }
    if (fontData->read(data + oldNameTableOffset, originalDataSize - oldNameTableOffset) < originalDataSize - oldNameTableOffset) {
        return NULL;
    }

    //Fix up the offsets of the directory entries after the old 'name' table entry.
    SkSFNTHeader::TableDirectoryEntry* currentEntry = reinterpret_cast<SkSFNTHeader::TableDirectoryEntry*>(data + sizeof(SkSFNTHeader));
    SkSFNTHeader::TableDirectoryEntry* endEntry = currentEntry + numTables;
    SkSFNTHeader::TableDirectoryEntry* headTableEntry = NULL;
    for (; currentEntry < endEntry; ++currentEntry) {
        uint32_t oldOffset = SkEndian_SwapBE32(currentEntry->offset);
        if (oldOffset > oldNameTableOffset) {
            currentEntry->offset = SkEndian_SwapBE32(oldOffset - oldNameTablePhysicalSize);
        }
        if (SkOTTableHead::TAG == currentEntry->tag) {
            headTableEntry = currentEntry;
        }
    }

    // Make the table directory entry point to the new 'name' table.
    SkSFNTHeader::TableDirectoryEntry* nameTableEntry = reinterpret_cast<SkSFNTHeader::TableDirectoryEntry*>(data + sizeof(SkSFNTHeader)) + tableIndex;
    nameTableEntry->logicalLength = SkEndian_SwapBE32(nameTableLogicalSize);
    nameTableEntry->offset = SkEndian_SwapBE32(originalDataSize);

    // Write the new 'name' table after the original font data.
    SkOTTableName* nameTable = reinterpret_cast<SkOTTableName*>(data + originalDataSize);
    unsigned short stringOffset = sizeof(SkOTTableName) + (namesCount * sizeof(SkOTTableName::Record));
    nameTable->format = SkOTTableName::format_0;
    nameTable->count = SkEndian_SwapBE16(namesCount);
    nameTable->stringOffset = SkEndian_SwapBE16(stringOffset);

    SkOTTableName::Record* nameRecords = reinterpret_cast<SkOTTableName::Record*>(data + originalDataSize + sizeof(SkOTTableName));
    for (int i = 0; i < namesCount; ++i) {
        nameRecords[i].platformID.value = SkOTTableName::Record::PlatformID::Windows;
        nameRecords[i].encodingID.windows.value = SkOTTableName::Record::EncodingID::Windows::UnicodeBMPUCS2;
        nameRecords[i].languageID.windows.value = SkOTTableName::Record::LanguageID::Windows::English_UnitedStates;
        nameRecords[i].nameID.predefined.value = namesToCreate[i];
        nameRecords[i].offset = SkEndian_SwapBE16(0);
        nameRecords[i].length = SkEndian_SwapBE16(fontNameLen * sizeof(wchar_t));
    }

    SK_OT_USHORT* nameString = reinterpret_cast<SK_OT_USHORT*>(data + originalDataSize + stringOffset);
    for (int i = 0; i < fontNameLen; ++i) {
        nameString[i] = SkEndian_SwapBE16(fontName[i]);
    }

    unsigned char* logical = data + originalDataSize + nameTableLogicalSize;
    unsigned char* physical = data + originalDataSize + nameTablePhysicalSize;
    for (; logical < physical; ++logical) {
        *logical = 0;
    }

    // Update the table checksum in the directory entry.
    nameTableEntry->checksum = SkEndian_SwapBE32(SkOTUtils::CalcTableChecksum(reinterpret_cast<SK_OT_ULONG*>(nameTable), nameTableLogicalSize));

    // Update the checksum adjustment in the head table.
    if (headTableEntry) {
        size_t headTableOffset = SkEndian_SwapBE32(headTableEntry->offset);
        if (headTableOffset + sizeof(SkOTTableHead) < originalDataSize) {
            SkOTTableHead* headTable = reinterpret_cast<SkOTTableHead*>(data + headTableOffset);
            headTable->checksumAdjustment = SkEndian_SwapBE32(0);
            uint32_t unadjustedFontChecksum = SkOTUtils::CalcTableChecksum(reinterpret_cast<SK_OT_ULONG*>(data), originalDataSize + nameTablePhysicalSize);
            headTable->checksumAdjustment = SkEndian_SwapBE32(SkOTTableHead::fontChecksum - unadjustedFontChecksum);
        }
    }

    return rewrittenFontData.detach();
}
bool SkOTTableName::Iterator::next(SkOTTableName::Iterator::Record& record) {
    const size_t nameRecordsCount = SkEndian_SwapBE16(fName.count);
    const SkOTTableName::Record* nameRecords = SkTAfter<const SkOTTableName::Record>(&fName);
    const SkOTTableName::Record* nameRecord;

    // Find the next record which matches the requested type.
    do {
        if (fIndex >= nameRecordsCount) {
            return false;
        }

        nameRecord = &nameRecords[fIndex];
        ++fIndex;
    } while (fType != -1 && nameRecord->nameID.fontSpecific != fType);

    record.type = nameRecord->nameID.fontSpecific;

    const uint16_t stringTableOffset = SkEndian_SwapBE16(fName.stringOffset);
    const char* stringTable = SkTAddOffset<const char>(&fName, stringTableOffset);

    // Decode the name into UTF-8.
    const uint16_t nameOffset = SkEndian_SwapBE16(nameRecord->offset);
    const uint16_t nameLength = SkEndian_SwapBE16(nameRecord->length);
    const char* nameString = SkTAddOffset<const char>(stringTable, nameOffset);
    switch (nameRecord->platformID.value) {
        case SkOTTableName::Record::PlatformID::Windows:
            if (SkOTTableName::Record::EncodingID::Windows::UnicodeBMPUCS2
                   != nameRecord->encodingID.windows.value
                && SkOTTableName::Record::EncodingID::Windows::UnicodeUCS4
                   != nameRecord->encodingID.windows.value
                && SkOTTableName::Record::EncodingID::Windows::Symbol
                   != nameRecord->encodingID.windows.value)
            {
                record.name.reset();
                break;
            }
        case SkOTTableName::Record::PlatformID::Unicode:
        case SkOTTableName::Record::PlatformID::ISO:
            SkStringFromUTF16BE((const uint16_t*)nameString, nameLength, record.name);
            break;

        case SkOTTableName::Record::PlatformID::Macintosh:
            // TODO: need better decoding, especially on Mac.
            if (SkOTTableName::Record::EncodingID::Macintosh::Roman
                != nameRecord->encodingID.macintosh.value)
            {
                record.name.reset();
                break;
            }
            SkStringFromMacRoman((const uint8_t*)nameString, nameLength, record.name);
            break;

        case SkOTTableName::Record::PlatformID::Custom:
            // These should never appear in a 'name' table.
        default:
            SkASSERT(false);
            record.name.reset();
            break;
    }

    // Determine the language.
    const uint16_t languageID = SkEndian_SwapBE16(nameRecord->languageID.languageTagID);

    // Handle format 1 languages.
    if (SkOTTableName::format_1 == fName.format && languageID >= 0x8000) {
        const uint16_t languageTagRecordIndex = languageID - 0x8000;

        const SkOTTableName::Format1Ext* format1ext =
            SkTAfter<const SkOTTableName::Format1Ext>(nameRecords, nameRecordsCount);

        if (languageTagRecordIndex < SkEndian_SwapBE16(format1ext->langTagCount)) {
            const SkOTTableName::Format1Ext::LangTagRecord* languageTagRecord =
                SkTAfter<const SkOTTableName::Format1Ext::LangTagRecord>(format1ext);

            uint16_t offset = SkEndian_SwapBE16(languageTagRecord[languageTagRecordIndex].offset);
            uint16_t length = SkEndian_SwapBE16(languageTagRecord[languageTagRecordIndex].length);
            const uint16_t* string = SkTAddOffset<const uint16_t>(stringTable, offset);
            SkStringFromUTF16BE(string, length, record.language);
            return true;
        }
    }

    // Handle format 0 languages, translating them into BCP 47.
    const BCP47FromLanguageId target = { languageID, "" };
    int languageIndex = SkTSearch<BCP47FromLanguageId, BCP47FromLanguageIdLess>(
        BCP47FromLanguageID, SK_ARRAY_COUNT(BCP47FromLanguageID), target, sizeof(target));
    if (languageIndex >= 0) {
        record.language = BCP47FromLanguageID[languageIndex].bcp47;
        return true;
    }

    // Unknown language, return the BCP 47 code 'und' for 'undetermined'.
    SkASSERT(false);
    record.language = "und";
    return true;
}
コード例 #9
0
ファイル: SkTypeface_win_dw.cpp プロジェクト: C-Tillion/skia
SkAdvancedTypefaceMetrics* DWriteFontTypeface::onGetAdvancedTypefaceMetrics(
        PerGlyphInfo perGlyphInfo,
        const uint32_t* glyphIDs,
        uint32_t glyphIDsCount) const {

    SkAdvancedTypefaceMetrics* info = nullptr;

    HRESULT hr = S_OK;

    const unsigned glyphCount = fDWriteFontFace->GetGlyphCount();

    DWRITE_FONT_METRICS dwfm;
    fDWriteFontFace->GetMetrics(&dwfm);

    info = new SkAdvancedTypefaceMetrics;
    info->fEmSize = dwfm.designUnitsPerEm;
    info->fLastGlyphID = SkToU16(glyphCount - 1);

    // SkAdvancedTypefaceMetrics::fFontName is in theory supposed to be
    // the PostScript name of the font. However, due to the way it is currently
    // used, it must actually be a family name.
    SkTScopedComPtr<IDWriteLocalizedStrings> familyNames;
    hr = fDWriteFontFamily->GetFamilyNames(&familyNames);

    UINT32 familyNameLen;
    hr = familyNames->GetStringLength(0, &familyNameLen);

    SkSMallocWCHAR familyName(familyNameLen+1);
    hr = familyNames->GetString(0, familyName.get(), familyNameLen+1);

    hr = sk_wchar_to_skstring(familyName.get(), familyNameLen, &info->fFontName);

    if (perGlyphInfo & kToUnicode_PerGlyphInfo) {
        populate_glyph_to_unicode(fDWriteFontFace.get(), glyphCount, &(info->fGlyphToUnicode));
    }

    DWRITE_FONT_FACE_TYPE fontType = fDWriteFontFace->GetType();
    if (fontType == DWRITE_FONT_FACE_TYPE_TRUETYPE ||
        fontType == DWRITE_FONT_FACE_TYPE_TRUETYPE_COLLECTION) {
        info->fType = SkAdvancedTypefaceMetrics::kTrueType_Font;
    } else {
        info->fAscent = dwfm.ascent;
        info->fDescent = dwfm.descent;
        info->fCapHeight = dwfm.capHeight;
        return info;
    }

    AutoTDWriteTable<SkOTTableHead> headTable(fDWriteFontFace.get());
    AutoTDWriteTable<SkOTTablePostScript> postTable(fDWriteFontFace.get());
    AutoTDWriteTable<SkOTTableHorizontalHeader> hheaTable(fDWriteFontFace.get());
    AutoTDWriteTable<SkOTTableOS2> os2Table(fDWriteFontFace.get());
    if (!headTable.fExists || !postTable.fExists || !hheaTable.fExists || !os2Table.fExists) {
        info->fAscent = dwfm.ascent;
        info->fDescent = dwfm.descent;
        info->fCapHeight = dwfm.capHeight;
        return info;
    }

    //There exist CJK fonts which set the IsFixedPitch and Monospace bits,
    //but have full width, latin half-width, and half-width kana.
    bool fixedWidth = (postTable->isFixedPitch &&
                      (1 == SkEndian_SwapBE16(hheaTable->numberOfHMetrics)));
    //Monospace
    if (fixedWidth) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kFixedPitch_Style;
    }
    //Italic
    if (os2Table->version.v0.fsSelection.field.Italic) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kItalic_Style;
    }
    //Script
    if (SkPanose::FamilyType::Script == os2Table->version.v0.panose.bFamilyType.value) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kScript_Style;
    //Serif
    } else if (SkPanose::FamilyType::TextAndDisplay == os2Table->version.v0.panose.bFamilyType.value &&
               SkPanose::Data::TextAndDisplay::SerifStyle::Triangle <= os2Table->version.v0.panose.data.textAndDisplay.bSerifStyle.value &&
               SkPanose::Data::TextAndDisplay::SerifStyle::NoFit != os2Table->version.v0.panose.data.textAndDisplay.bSerifStyle.value) {
        info->fStyle |= SkAdvancedTypefaceMetrics::kSerif_Style;
    }

    info->fItalicAngle = SkEndian_SwapBE32(postTable->italicAngle) >> 16;

    info->fAscent = SkToS16(dwfm.ascent);
    info->fDescent = SkToS16(dwfm.descent);
    info->fCapHeight = SkToS16(dwfm.capHeight);

    info->fBBox = SkIRect::MakeLTRB((int32_t)SkEndian_SwapBE16((uint16_t)headTable->xMin),
                                    (int32_t)SkEndian_SwapBE16((uint16_t)headTable->yMax),
                                    (int32_t)SkEndian_SwapBE16((uint16_t)headTable->xMax),
                                    (int32_t)SkEndian_SwapBE16((uint16_t)headTable->yMin));

    //TODO: is this even desired? It seems PDF only wants this value for Type1
    //fonts, and we only get here for TrueType fonts.
    info->fStemV = 0;
    /*
    // Figure out a good guess for StemV - Min width of i, I, !, 1.
    // This probably isn't very good with an italic font.
    int16_t min_width = SHRT_MAX;
    info->fStemV = 0;
    char stem_chars[] = {'i', 'I', '!', '1'};
    for (size_t i = 0; i < SK_ARRAY_COUNT(stem_chars); i++) {
        ABC abcWidths;
        if (GetCharABCWidths(hdc, stem_chars[i], stem_chars[i], &abcWidths)) {
            int16_t width = abcWidths.abcB;
            if (width > 0 && width < min_width) {
                min_width = width;
                info->fStemV = min_width;
            }
        }
    }
    */

    if (perGlyphInfo & kHAdvance_PerGlyphInfo) {
        if (fixedWidth) {
            SkAdvancedTypefaceMetrics::WidthRange range(0);
            int16_t advance;
            getWidthAdvance(fDWriteFontFace.get(), 1, &advance);
            range.fAdvance.append(1, &advance);
            SkAdvancedTypefaceMetrics::FinishRange(
                    &range, 0, SkAdvancedTypefaceMetrics::WidthRange::kDefault);
            info->fGlyphWidths.emplace_back(std::move(range));
        } else {
            IDWriteFontFace* borrowedFontFace = fDWriteFontFace.get();
            info->setGlyphWidths(
                glyphCount,
                glyphIDs,
                glyphIDsCount,
                SkAdvancedTypefaceMetrics::GetAdvance([borrowedFontFace](int gId, int16_t* data) {
                    return getWidthAdvance(borrowedFontFace, gId, data);
                })
            );
        }
    }

    return info;
}