type1font.java

来自「处理PDF」· Java 代码 · 共 826 行 · 第 1/3 页

 */
    private PdfDictionary getFontDescriptor(PdfIndirectReference fontStream)
    {
        if (builtinFont)
            return null;
        PdfDictionary dic = new PdfDictionary(PdfName.FONTDESCRIPTOR);
        dic.put(PdfName.ASCENT, new PdfNumber(Ascender));
        dic.put(PdfName.CAPHEIGHT, new PdfNumber(CapHeight));
        dic.put(PdfName.DESCENT, new PdfNumber(Descender));
        dic.put(PdfName.FONTBBOX, new PdfRectangle(llx, lly, urx, ury));
        dic.put(PdfName.FONTNAME, new PdfName(FontName));
        dic.put(PdfName.ITALICANGLE, new PdfNumber(ItalicAngle));
        dic.put(PdfName.STEMV, new PdfNumber(StdVW));
        if (fontStream != null)
            dic.put(PdfName.FONTFILE, fontStream);
        int flags = 0;
        if (IsFixedPitch)
            flags |= 1;
        flags |= fontSpecific ? 4 : 32;
        if (ItalicAngle < 0)
            flags |= 64;
        if (FontName.indexOf("Caps") >= 0 || FontName.endsWith("SC"))
            flags |= 131072;
        if (Weight.equals("Bold"))
            flags |= 262144;
        dic.put(PdfName.FLAGS, new PdfNumber(flags));
        
        return dic;
    }
    
    /** Generates the font dictionary for this font.
     * @return the PdfDictionary containing the font dictionary
     * @param firstChar the first valid character
     * @param lastChar the last valid character
     * @param shortTag a 256 bytes long <CODE>byte</CODE> array where each unused byte is represented by 0
     * @param fontDescriptor the indirect reference to a PdfDictionary containing the font descriptor or <CODE>null</CODE>
     */
    private PdfDictionary getFontBaseType(PdfIndirectReference fontDescriptor, int firstChar, int lastChar, byte shortTag[])
    {
        PdfDictionary dic = new PdfDictionary(PdfName.FONT);
        dic.put(PdfName.SUBTYPE, PdfName.TYPE1);
        dic.put(PdfName.BASEFONT, new PdfName(FontName));
        boolean stdEncoding = encoding.equals("Cp1252") || encoding.equals("MacRoman");
        if (!fontSpecific || specialMap != null) {
            for (int k = firstChar; k <= lastChar; ++k) {
                if (!differences[k].equals(notdef)) {
                    firstChar = k;
                    break;
                }
            }
            if (stdEncoding)
                dic.put(PdfName.ENCODING, encoding.equals("Cp1252") ? PdfName.WIN_ANSI_ENCODING : PdfName.MAC_ROMAN_ENCODING);
            else {
                PdfDictionary enc = new PdfDictionary(PdfName.ENCODING);
                PdfArray dif = new PdfArray();
                boolean gap = true;                
                for (int k = firstChar; k <= lastChar; ++k) {
                    if (shortTag[k] != 0) {
                        if (gap) {
                            dif.add(new PdfNumber(k));
                            gap = false;
                        }
                        dif.add(new PdfName(differences[k]));
                    }
                    else
                        gap = true;
                }
                enc.put(PdfName.DIFFERENCES, dif);
                dic.put(PdfName.ENCODING, enc);
            }
        }
        if (specialMap != null || forceWidthsOutput || !(builtinFont && (fontSpecific || stdEncoding))) {
            dic.put(PdfName.FIRSTCHAR, new PdfNumber(firstChar));
            dic.put(PdfName.LASTCHAR, new PdfNumber(lastChar));
            PdfArray wd = new PdfArray();
            for (int k = firstChar; k <= lastChar; ++k) {
                if (shortTag[k] == 0)
                    wd.add(new PdfNumber(0));
                else
                    wd.add(new PdfNumber(widths[k]));
            }
            dic.put(PdfName.WIDTHS, wd);
        }
        if (!builtinFont && fontDescriptor != null)
            dic.put(PdfName.FONTDESCRIPTOR, fontDescriptor);
        return dic;
    }
    
    /** Outputs to the writer the font dictionaries and streams.
     * @param writer the writer for this document
     * @param ref the font indirect reference
     * @param params several parameters that depend on the font type
     * @throws IOException on error
     * @throws DocumentException error in generating the object
     */
    void writeFont(PdfWriter writer, PdfIndirectReference ref, Object params[]) throws DocumentException, IOException {
        int firstChar = ((Integer)params[0]).intValue();
        int lastChar = ((Integer)params[1]).intValue();
        byte shortTag[] = (byte[])params[2];
        boolean subsetp = ((Boolean)params[3]).booleanValue() && subset;
        if (!subsetp) {
            firstChar = 0;
            lastChar = shortTag.length - 1;
            for (int k = 0; k < shortTag.length; ++k)
                shortTag[k] = 1;
        }
        PdfIndirectReference ind_font = null;
        PdfObject pobj = null;
        PdfIndirectObject obj = null;
        pobj = getFullFontStream();
        if (pobj != null){
            obj = writer.addToBody(pobj);
            ind_font = obj.getIndirectReference();
        }
        pobj = getFontDescriptor(ind_font);
        if (pobj != null){
            obj = writer.addToBody(pobj);
            ind_font = obj.getIndirectReference();
        }
        pobj = getFontBaseType(ind_font, firstChar, lastChar, shortTag);
        writer.addToBody(pobj, ref);
    }
    
    /** Gets the font parameter identified by <CODE>key</CODE>. Valid values
     * for <CODE>key</CODE> are <CODE>ASCENT</CODE>, <CODE>CAPHEIGHT</CODE>, <CODE>DESCENT</CODE>,
     * <CODE>ITALICANGLE</CODE>, <CODE>BBOXLLX</CODE>, <CODE>BBOXLLY</CODE>, <CODE>BBOXURX</CODE>
     * and <CODE>BBOXURY</CODE>.
     * @param key the parameter to be extracted
     * @param fontSize the font size in points
     * @return the parameter in points
     */    
    public float getFontDescriptor(int key, float fontSize) {
        switch (key) {
            case AWT_ASCENT:
            case ASCENT:
                return Ascender * fontSize / 1000;
            case CAPHEIGHT:
                return CapHeight * fontSize / 1000;
            case AWT_DESCENT:
            case DESCENT:
                return Descender * fontSize / 1000;
            case ITALICANGLE:
                return ItalicAngle;
            case BBOXLLX:
                return llx * fontSize / 1000;
            case BBOXLLY:
                return lly * fontSize / 1000;
            case BBOXURX:
                return urx * fontSize / 1000;
            case BBOXURY:
                return ury * fontSize / 1000;
            case AWT_LEADING:
                return 0;
            case AWT_MAXADVANCE:
                return (urx - llx) * fontSize / 1000;
            case UNDERLINE_POSITION:
                return UnderlinePosition * fontSize / 1000;
            case UNDERLINE_THICKNESS:
                return UnderlineThickness * fontSize / 1000;
        }
        return 0;
    }
    
    /** Gets the postscript font name.
     * @return the postscript font name
     */
    public String getPostscriptFontName() {
        return FontName;
    }
    
    /** Gets the full name of the font. If it is a True Type font
     * each array element will have {Platform ID, Platform Encoding ID,
     * Language ID, font name}. The interpretation of this values can be
     * found in the Open Type specification, chapter 2, in the 'name' table.<br>
     * For the other fonts the array has a single element with {"", "", "",
     * font name}.
     * @return the full name of the font
     */
    public String[][] getFullFontName() {
        return new String[][]{{"", "", "", FullName}};
    }
    
    /** Gets all the entries of the names-table. If it is a True Type font
     * each array element will have {Name ID, Platform ID, Platform Encoding ID,
     * Language ID, font name}. The interpretation of this values can be
     * found in the Open Type specification, chapter 2, in the 'name' table.<br>
     * For the other fonts the array has a single element with {"4", "", "", "",
     * font name}.
     * @return the full name of the font
     */
    public String[][] getAllNameEntries() {
        return new String[][]{{"4", "", "", "", FullName}};
    }
    
    /** Gets the family name of the font. If it is a True Type font
     * each array element will have {Platform ID, Platform Encoding ID,
     * Language ID, font name}. The interpretation of this values can be
     * found in the Open Type specification, chapter 2, in the 'name' table.<br>
     * For the other fonts the array has a single element with {"", "", "",
     * font name}.
     * @return the family name of the font
     */
    public String[][] getFamilyFontName() {
        return new String[][]{{"", "", "", FamilyName}};
    }
    
    /** Checks if the font has any kerning pairs.
     * @return <CODE>true</CODE> if the font has any kerning pairs
     */    
    public boolean hasKernPairs() {
        return !KernPairs.isEmpty();
    }
    
    /**
     * Sets the font name that will appear in the pdf font dictionary.
     * Use with care as it can easily make a font unreadable if not embedded.
     * @param name the new font name
     */    
    public void setPostscriptFontName(String name) {
        FontName = name;
    }
    
    /**
     * Sets the kerning between two Unicode chars.
     * @param char1 the first char
     * @param char2 the second char
     * @param kern the kerning to apply in normalized 1000 units
     * @return <code>true</code> if the kerning was applied, <code>false</code> otherwise
     */
    public boolean setKerning(int char1, int char2, int kern) {
        String first = GlyphList.unicodeToName(char1);
        if (first == null)
            return false;
        String second = GlyphList.unicodeToName(char2);
        if (second == null)
            return false;
        Object obj[] = (Object[])KernPairs.get(first);
        if (obj == null) {
            obj = new Object[]{second, new Integer(kern)};
            KernPairs.put(first, obj);
            return true;
        }
        for (int k = 0; k < obj.length; k += 2) {
            if (second.equals(obj[k])) {
                obj[k + 1] = new Integer(kern);
                return true;
            }
        }
        int size = obj.length;
        Object obj2[] = new Object[size + 2];
        System.arraycopy(obj, 0, obj2, 0, size);
        obj2[size] = second;
        obj2[size + 1] = new Integer(kern);
        KernPairs.put(first, obj2);
        return true;
    }
    
    protected int[] getRawCharBBox(int c, String name) {
        Object metrics[];
        if (name == null) { // font specific
            metrics = (Object[])CharMetrics.get(new Integer(c));
        }
        else {
            if (name.equals(".notdef"))
                return null;
            metrics = (Object[])CharMetrics.get(name);
        }
        if (metrics != null)
            return ((int[])(metrics[3]));
        return null;
    }
    
}