ttffont.dart
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/*
* Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General License for more details.
*
* You should have received a copy of the GNU Lesser General
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
part of pdf;
class PDFTTFFont extends PDFFont {
PDFObject unicodeCMap;
PDFFontDescriptor descriptor;
PDFArrayObject widthsObject;
final widths = new List<String>();
TtfFont _font;
int _charMin;
int _charMax;
/// Constructs a PDFTTFFont
PDFTTFFont(PDFDocument pdfDocument, Uint8List bytes)
: super(pdfDocument, subtype: "/TrueType") {
_font = new TtfParser().parse(bytes);
baseFont = "/" + _font.name.fontName.replaceAll(" ", "");
PDFObjectStream file = new PDFObjectStream(pdfDocument, isBinary: true);
file.buf.putBytes(bytes);
file.params["/Length1"] = PDFStream.intNum(bytes.length);
_charMin = 32;
_charMax = 255;
for (var i = _charMin; i <= _charMax; i++) {
widths.add((glyphAdvance(i) * 1000.0).toString());
}
unicodeCMap = new PDFObject(pdfDocument);
descriptor = new PDFFontDescriptor(this, file, _font);
widthsObject = new PDFArrayObject(pdfDocument, widths);
}
@override
double glyphAdvance(int charCode) {
var g = _font.cmap.charToGlyphIndexMap[charCode];
if (g == null) {
return super.glyphAdvance(charCode);
}
return _font.hmtx.metrics[g].advanceWidth / _font.head.unitsPerEm;
}
@override
PDFRect glyphBounds(int charCode) {
var g = _font.cmap.charToGlyphIndexMap[charCode];
if (g == null) {
return super.glyphBounds(charCode);
}
var info = _font.glyf.glyphInfoMap[g];
return new PDFRect(
info.xMin.toDouble() / _font.head.unitsPerEm,
info.yMin.toDouble() / _font.head.unitsPerEm,
(info.xMax - info.xMin).toDouble() / _font.head.unitsPerEm,
(info.yMax - info.yMin).toDouble() / _font.head.unitsPerEm);
}
@override
void prepare() {
super.prepare();
params["/FirstChar"] = PDFStream.intNum(_charMin);
params["/LastChar"] = PDFStream.intNum(_charMax);
params["/Widths"] = widthsObject.ref();
params["/FontDescriptor"] = descriptor.ref();
// params["/Encoding"] = PDFStream.string("/Identity-H");
// params["/ToUnicode"] = unicodeCMap.ref();
}
}