Guess font name and attribute from file nam is not correct, especially for CJK fonts.

[chunlinyao]

CSSBoxPdf guess font file url by matching file name and font family name. It's not correct especially for CJK font. I suggest using FontMapper to get font.

Change PDFRender#setFont like this. It is still a POC.

    /**
     * Creates object describing font
     * 
     * @return the font object
     */
    private PDFont setFont(String fontFamily, boolean isItalic, boolean isBold)
    {
        COSDictionary dictionary = new COSDictionary();
        dictionary.setItem( COSName.TYPE, COSName.FONT_DESC );
        PDFontDescriptor desc = new PDFontDescriptor(dictionary);
        desc.setItalic(isItalic);
        desc.setFontWeight(isBold? 700: 400);
        desc.setFontFamily(fontFamily);
        FontMapping<TrueTypeFont> trueTypeFont = FontMappers.instance().getTrueTypeFont(fontFamily, desc);

        PDFont font = null;
        if (trueTypeFont != null) {
            try {
                font = PDType0Font.load(doc, trueTypeFont.getFont(), true);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return font;
    }

[chunlinyao]

POC commit.

https://github.com/chunlinyao/CSSBoxPdf/commit/3730044aa2c5c48cc89a573c860bf71ff73701e8

[radkovo]

Thanks for submitting this, it look much better than the original solution (which was very old). I am really interested in including it in the project.

[radkovo]

Well, I did some more testing and it seems to me that this method is not able to find the bold and italic variants. E.g. for Arial it ends up with ArialMT in all cases independently on the isBold and isItalic arguments. I dived a bit into the getTrueTypeFont() code and it seems that descriptor is generally ignored for the common fonts and otherwise, the code is full of font name-based heuristics similarly to my original code. Or am I missing something?

[radkovo]

For your info, my current version that seems to work at least with the common fonts:

    private PDFont createFont(String fontFamily, boolean isItalic, boolean isBold)
    {
        //guess a postscript name
        String psname = fontFamily.replace(" ", "");
        if (isBold && isItalic) psname += ",BoldItalic";
        else if (isBold) psname += ",Bold";
        else if (isItalic) psname += ",Italic";
        //font descriptor is used only for finding fallback fonts when the mapping fails
        COSDictionary dictionary = new COSDictionary();
        dictionary.setItem(COSName.TYPE, COSName.FONT_DESC);
        PDFontDescriptor desc = new PDFontDescriptor(dictionary);
        desc.setItalic(isItalic);
        desc.setFontWeight(isBold ? 700 : 400);
        desc.setFontFamily(fontFamily);
        FontMapping<TrueTypeFont> trueTypeFont = FontMappers.instance().getTrueTypeFont(psname, desc);

        PDFont font = null;
        if (trueTypeFont != null) {
            try {
                font = PDType0Font.load(doc, trueTypeFont.getFont(), true);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return font;
    }

[chunlinyao]

It seems work well, Maybe allow user provide additional font substitute table will be more flexible.

Radek Burget notifications@github.com 于 2019年11月20日周三 上午3:58写道：

For your info, my current version that seems to work at least with the common fonts:

private PDFont createFont(String fontFamily, boolean isItalic, boolean isBold)
{
    //guess a postscript name
    String psname = fontFamily.replace(" ", "");
    if (isBold && isItalic) psname += ",BoldItalic";
    else if (isBold) psname += ",Bold";
    else if (isItalic) psname += ",Italic";
    //font descriptor is used only for finding fallback fonts when the mapping fails
    COSDictionary dictionary = new COSDictionary();
    dictionary.setItem(COSName.TYPE, COSName.FONT_DESC);
    PDFontDescriptor desc = new PDFontDescriptor(dictionary);
    desc.setItalic(isItalic);
    desc.setFontWeight(isBold ? 400 : 700);
    desc.setFontFamily(fontFamily);
    FontMapping<TrueTypeFont> trueTypeFont = FontMappers.instance().getTrueTypeFont(psname, desc);

    PDFont font = null;
    if (trueTypeFont != null) {
        try {
            font = PDType0Font.load(doc, trueTypeFont.getFont(), true);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
    return font;
}

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