experimental/PdfViewer/SkPdfFont.cpp

#include "SkPdfFont.h"

std::map<std::string, SkPdfStandardFontEntry>& getStandardFonts() {
    static std::map<std::string, SkPdfStandardFontEntry> gPdfStandardFonts;

    // TODO (edisonn): , vs - ? what does it mean?
    // TODO (edisonn): MT, PS, Oblique=italic?, ... what does it mean?
    if (gPdfStandardFonts.empty()) {
        gPdfStandardFonts["Arial"] = {"Arial", false, false};
        gPdfStandardFonts["Arial,Bold"] = {"Arial", true, false};
        gPdfStandardFonts["Arial,BoldItalic"] = {"Arial", true, true};
        gPdfStandardFonts["Arial,Italic"] = {"Arial", false, true};
        gPdfStandardFonts["Arial-Bold"] = {"Arial", true, false};
        gPdfStandardFonts["Arial-BoldItalic"] = {"Arial", true, true};
        gPdfStandardFonts["Arial-BoldItalicMT"] = {"Arial", true, true};
        gPdfStandardFonts["Arial-BoldMT"] = {"Arial", true, false};
        gPdfStandardFonts["Arial-Italic"] = {"Arial", false, true};
        gPdfStandardFonts["Arial-ItalicMT"] = {"Arial", false, true};
        gPdfStandardFonts["ArialMT"] = {"Arial", false, false};
        gPdfStandardFonts["Courier"] = {"Courier New", false, false};
        gPdfStandardFonts["Courier,Bold"] = {"Courier New", true, false};
        gPdfStandardFonts["Courier,BoldItalic"] = {"Courier New", true, true};
        gPdfStandardFonts["Courier,Italic"] = {"Courier New", false, true};
        gPdfStandardFonts["Courier-Bold"] = {"Courier New", true, false};
        gPdfStandardFonts["Courier-BoldOblique"] = {"Courier New", true, true};
        gPdfStandardFonts["Courier-Oblique"] = {"Courier New", false, true};
        gPdfStandardFonts["CourierNew"] = {"Courier New", false, false};
        gPdfStandardFonts["CourierNew,Bold"] = {"Courier New", true, false};
        gPdfStandardFonts["CourierNew,BoldItalic"] = {"Courier New", true, true};
        gPdfStandardFonts["CourierNew,Italic"] = {"Courier New", false, true};
        gPdfStandardFonts["CourierNew-Bold"] = {"Courier New", true, false};
        gPdfStandardFonts["CourierNew-BoldItalic"] = {"Courier New", true, true};
        gPdfStandardFonts["CourierNew-Italic"] = {"Courier New", false, true};
        gPdfStandardFonts["CourierNewPS-BoldItalicMT"] = {"Courier New", true, true};
        gPdfStandardFonts["CourierNewPS-BoldMT"] = {"Courier New", true, false};
        gPdfStandardFonts["CourierNewPS-ItalicMT"] = {"Courier New", false, true};
        gPdfStandardFonts["CourierNewPSMT"] = {"Courier New", false, false};
        gPdfStandardFonts["Helvetica"] = {"Helvetica", false, false};
        gPdfStandardFonts["Helvetica,Bold"] = {"Helvetica", true, false};
        gPdfStandardFonts["Helvetica,BoldItalic"] = {"Helvetica", true, true};
        gPdfStandardFonts["Helvetica,Italic"] = {"Helvetica", false, true};
        gPdfStandardFonts["Helvetica-Bold"] = {"Helvetica", true, false};
        gPdfStandardFonts["Helvetica-BoldItalic"] = {"Helvetica", true, true};
        gPdfStandardFonts["Helvetica-BoldOblique"] = {"Helvetica", true, true};
        gPdfStandardFonts["Helvetica-Italic"] = {"Helvetica", false, true};
        gPdfStandardFonts["Helvetica-Oblique"] = {"Helvetica", false, true};
        gPdfStandardFonts["Times-Bold"] = {"Times New Roman", true, false};
        gPdfStandardFonts["Times-BoldItalic"] = {"Times New Roman", true, true};
        gPdfStandardFonts["Times-Italic"] = {"Times New Roman", false, true};
        gPdfStandardFonts["Times-Roman"] = {"Times New Roman", false, false};
        gPdfStandardFonts["TimesNewRoman"] = {"Times New Roman", false, false};
        gPdfStandardFonts["TimesNewRoman,Bold"] = {"Times New Roman", true, false};
        gPdfStandardFonts["TimesNewRoman,BoldItalic"] = {"Times New Roman", true, true};
        gPdfStandardFonts["TimesNewRoman,Italic"] = {"Times New Roman", false, true};
        gPdfStandardFonts["TimesNewRoman-Bold"] = {"Times New Roman", true, false};
        gPdfStandardFonts["TimesNewRoman-BoldItalic"] = {"Times New Roman", true, true};
        gPdfStandardFonts["TimesNewRoman-Italic"] = {"Times New Roman", false, true};
        gPdfStandardFonts["TimesNewRomanPS"] = {"Times New Roman", false, false};
        gPdfStandardFonts["TimesNewRomanPS-Bold"] = {"Times New Roman", true, false};
        gPdfStandardFonts["TimesNewRomanPS-BoldItalic"] = {"Times New Roman", true, true};
        gPdfStandardFonts["TimesNewRomanPS-BoldItalicMT"] = {"Times New Roman", true, true};
        gPdfStandardFonts["TimesNewRomanPS-BoldMT"] = {"Times New Roman", true, false};
        gPdfStandardFonts["TimesNewRomanPS-Italic"] = {"Times New Roman", false, true};
        gPdfStandardFonts["TimesNewRomanPS-ItalicMT"] = {"Times New Roman", false, true};
        gPdfStandardFonts["TimesNewRomanPSMT"] = {"Times New Roman", false, false};
        gPdfStandardFonts["Symbol"] = {"Symbol", false, false};
        gPdfStandardFonts["ZapfDingbats"] = {"ZapfDingbats", false, false};

        // TODO(edisonn): these are hacks. Load Post Script font name.
        // see FT_Get_Postscript_Name
        // Font config is not using it, yet.
        //https://bugs.freedesktop.org/show_bug.cgi?id=18095
        gPdfStandardFonts["Arial-Black"] = {"Arial", true, false};
        gPdfStandardFonts["DejaVuSans"] = {"DejaVu Sans", false, false};
        gPdfStandardFonts["DejaVuSansMono"] = {"DejaVuSans Mono", false, false};
        gPdfStandardFonts["DejaVuSansMono-Bold"] = {"DejaVuSans Mono", true, false};
        gPdfStandardFonts["DejaVuSansMono-Oblique"] = {"DejaVuSans Mono", false, true};
        gPdfStandardFonts["Georgia-Bold"] = {"Georgia", true, false};
        gPdfStandardFonts["Georgia-BoldItalic"] = {"Georgia", true, true};
        gPdfStandardFonts["Georgia-Italic"] = {"Georgia", false, true};
        gPdfStandardFonts["TrebuchetMS"] = {"Trebuchet MS", false, false};
        gPdfStandardFonts["TrebuchetMS-Bold"] = {"Trebuchet MS", true, false};
        gPdfStandardFonts["Verdana-Bold"] = {"Verdana", true, false};
        gPdfStandardFonts["WenQuanYiMicroHei"] = {"WenQuanYi Micro Hei", false, false};
    }

    return gPdfStandardFonts;
}

SkTypeface* SkTypefaceFromPdfStandardFont(const char* fontName, bool bold, bool italic) {
    std::map<std::string, SkPdfStandardFontEntry>& standardFontMap = getStandardFonts();

    SkTypeface* typeface = NULL;
    if (standardFontMap.find(fontName) != standardFontMap.end()) {
        SkPdfStandardFontEntry fontData = standardFontMap[fontName];

        // TODO(edisonn): How does the bold/italic specified in standard definition combines with
        // the one in /font key? use OR for now.
        bold = bold || fontData.fIsBold;
        italic = italic || fontData.fIsItalic;

        typeface = SkTypeface::CreateFromName(
            fontData.fName,
            SkTypeface::Style((bold ? SkTypeface::kBold : 0) |
                              (italic ? SkTypeface::kItalic : 0)));
    } else {
        typeface = SkTypeface::CreateFromName(
            fontName,
            SkTypeface::kNormal);
    }

    if (typeface) {
        typeface->ref();
    }
    return typeface;
}

SkPdfFont* SkPdfFontFromName(SkPdfObject* obj, const char* fontName) {
    SkTypeface* typeface = SkTypefaceFromPdfStandardFont(fontName, false, false);
    if (typeface != NULL) {
        return new SkPdfStandardFont(typeface);
    }
//        SkPdfObject* font = obtainFont(pdfContext, fontName);
//        if (!font->asFontDictionary()) {
//            return NULL;
//        }
//        SkPdfFont::fontFromPdfDictionary(font->asDictionary());
//    }
    // TODO(edisonn): deal with inherited fonts, load from parent objects
    return SkPdfFont::Default();
}

SkPdfFont* SkPdfFont::fontFromPdfDictionary(SkPdfFontDictionary* dict) {
    if (dict == NULL) {
        return NULL;  // TODO(edisonn): report default one?
    }

    switch (dict->getType()) {
        case kType0FontDictionary_SkPdfObjectType:
            return fontFromType0FontDictionary(dict->asType0FontDictionary());

        case kTrueTypeFontDictionary_SkPdfObjectType:
            return fontFromTrueTypeFontDictionary(dict->asTrueTypeFontDictionary());

        case kType1FontDictionary_SkPdfObjectType:
            return fontFromType1FontDictionary(dict->asType1FontDictionary());

        case kCIDFontDictionary_SkPdfObjectType:
            return fontFromCIDFontDictionary(dict->asCIDFontDictionary());

        case kMultiMasterFontDictionary_SkPdfObjectType:
            return fontFromMultiMasterFontDictionary(dict->asMultiMasterFontDictionary());

        case kType3FontDictionary_SkPdfObjectType:
            return fontFromType3FontDictionary(dict->asType3FontDictionary());
    }
    return NULL;  // TODO(edisonn): report error?
}

SkPdfType0Font* SkPdfFont::fontFromType0FontDictionary(SkPdfType0FontDictionary* dict) {
    if (dict == NULL) {
        return NULL;  // default one?
    }

    return new SkPdfType0Font(dict);
}

SkPdfType1Font* SkPdfFont:: fontFromType1FontDictionary(SkPdfType1FontDictionary* dict) {
    if (dict == NULL) {
        return NULL;  // default one?
    }

    return new SkPdfType1Font(dict);
}

SkPdfType3Font* SkPdfFont::fontFromType3FontDictionary(SkPdfType3FontDictionary* dict) {
    if (dict == NULL) {
        return NULL;  // default one?
    }

    return new SkPdfType3Font(dict);
}

SkPdfTrueTypeFont* SkPdfFont::fontFromTrueTypeFontDictionary(SkPdfTrueTypeFontDictionary* dict) {
    if (dict == NULL) {
        return NULL;  // default one?
    }

    return new SkPdfTrueTypeFont(dict);
}

SkPdfCIDFont* SkPdfFont::fontFromCIDFontDictionary(SkPdfCIDFontDictionary* dict) {
    if (dict == NULL) {
        return NULL;  // default one?
    }

    return new SkPdfCIDFont(dict);
}

SkPdfMultiMasterFont* SkPdfFont::fontFromMultiMasterFontDictionary(SkPdfMultiMasterFontDictionary* dict) {
    if (dict == NULL) {
        return NULL;  // default one?
    }

    return new SkPdfMultiMasterFont(dict);
}

static int skstoi(const SkPdfString* str) {
    int ret = 0;
    for (int i = 0 ; i < str->podofo()->GetString().GetLength(); i++) {
        ret = (ret << 8) + ((unsigned char*)str->podofo()->GetString().GetString())[i];
    }
    return ret;
}

SkPdfType0Font::SkPdfType0Font(SkPdfType0FontDictionary* dict) {
    fBaseFont = SkPdfFontFromName(dict, dict->BaseFont().c_str());

    // TODO(edisonn): load encoding, let it now to be Identity-H by default
    if (dict->has_Encoding()) {
        if (dict->isEncodingAName()) {
            //report encoding not supported
            //fEncoding = loadEncodingFromName(dict->getEncodingAsName().c_str());
        } else if (dict->isEncodingAStream()) {
            //fEncoding = loadEncodingFromStream(dict->getEncodingAsStream());
        } else {
            // error
        }
    }

    fCMapEncoding = NULL;
    fCMapEncodingFlag = NULL;

    if (dict->has_ToUnicode()) {
        const SkPdfStream* stream = dict->ToUnicode();
        SkPdfTokenizer tokenizer(stream);
        PdfToken token;

        fCMapEncoding = new unsigned short[256 * 256];
        fCMapEncodingFlag = new unsigned char[256 * 256];
        for (int i = 0 ; i < 256 * 256; i++) {
            fCMapEncoding[i] = i;
            fCMapEncodingFlag[i] = 0;
        }

        // TODO(edisonn): deal with multibyte character, or longer strings.
        // Ritght now we deal with up 2 characters, e.g. <0020> but not longer like <00660066006C>
        //2 beginbfrange
        //<0000> <005E> <0020>
        //<005F> <0061> [<00660066> <00660069> <00660066006C>]

        while (tokenizer.readToken(&token)) {

            if (token.fType == kKeyword_TokenType && strcmp(token.fKeyword, "begincodespacerange") == 0) {
                while (tokenizer.readToken(&token) && !(token.fType == kKeyword_TokenType && strcmp(token.fKeyword, "endcodespacerange") == 0)) {
//                    tokenizer.PutBack(token);
//                    tokenizer.readToken(&token);
                    // TODO(edisonn): check token type! ignore/report errors.
                    int start = skstoi(token.fObject->asString());
                    tokenizer.readToken(&token);
                    int end = skstoi(token.fObject->asString());
                    for (int i = start; i <= end; i++) {
                        fCMapEncodingFlag[i] |= 1;
                    }
                }
            }

            if (token.fType == kKeyword_TokenType && strcmp(token.fKeyword, "beginbfchar") == 0) {
                while (tokenizer.readToken(&token) && !(token.fType == kKeyword_TokenType && strcmp(token.fKeyword, "endbfchar") == 0)) {
//                    tokenizer.PutBack(token);
//                    tokenizer.readToken(&token);
                    int from = skstoi(token.fObject->asString());
                    tokenizer.readToken(&token);
                    int to = skstoi(token.fObject->asString());

                    fCMapEncodingFlag[from] |= 2;
                    fCMapEncoding[from] = to;
                }
            }

            if (token.fType == kKeyword_TokenType && strcmp(token.fKeyword, "beginbfrange") == 0) {
                while (tokenizer.readToken(&token) && !(token.fType == kKeyword_TokenType && strcmp(token.fKeyword, "endbfrange") == 0)) {
//                    tokenizer.PutBack(token);
//                    tokenizer.readToken(&token);
                    int start = skstoi(token.fObject->asString());
                    tokenizer.readToken(&token);
                    int end = skstoi(token.fObject->asString());


                    tokenizer.readToken(&token); // [ or just an array directly?
//                    tokenizer.PutBack(token);

                    if (token.fType == kObject_TokenType && token.fObject->asString()) {
//                        tokenizer.readToken(&token);
                        int value = skstoi(token.fObject->asString());

                        for (int i = start; i <= end; i++) {
                            fCMapEncodingFlag[i] |= 2;
                            fCMapEncoding[i] = value;
                            value++;
                            // if i != end, verify last byte id not if, ignore/report error
                        }

                        // read one string
                    } else if (token.fType == kObject_TokenType && token.fObject->asArray()) {
//                        tokenizer.readToken(&token);
                        for (int i = 0; i < token.fObject->asArray()->size(); i++) {
                            fCMapEncodingFlag[start + i] |= 2;
                            fCMapEncoding[start + i] = skstoi((*token.fObject->asArray())[i]->asString());
                        }
                        // read array
                    }

                    //fCMapEncodingFlag[from] = 1;
                    //fCMapEncoding[from] = to;
                }
            }
        }
    }
}