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Adds heuristic for monospace font detection

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This commit is contained in:
Yury Delendik 2012-09-16 14:38:30 -05:00
parent ac7b6aeff4
commit 8d506212a8
1 changed files with 22 additions and 1 deletions
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23
src/evaluator.js
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@ -825,21 +825,41 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
}
}
// Heuristic: detection of monospace font by checking all non-zero widths
var isMonospace = true, firstWidth = defaultWidth;
for (var glyph in glyphsWidths) {
var glyphWidth = glyphsWidths[glyph];
if (!glyphWidth)
continue;
if (!firstWidth) {
firstWidth = glyphWidth;
continue;
}
if (firstWidth != glyphWidth) {
isMonospace = false;
break;
}
}
if (isMonospace)
properties.flags |= FontFlags.FixedPitch;
properties.defaultWidth = defaultWidth;
properties.widths = glyphsWidths;
},
getBaseFontMetrics: function PartialEvaluator_getBaseFontMetrics(name) {
var defaultWidth = 0, widths = [];
var defaultWidth = 0, widths = [], monospace = false;
var glyphWidths = Metrics[stdFontMap[name] || name];
if (isNum(glyphWidths)) {
defaultWidth = glyphWidths;
monospace = true;
} else {
widths = glyphWidths;
}
return {
defaultWidth: defaultWidth,
monospace: monospace,
widths: widths
};
},
@ -893,6 +913,7 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
var fontNameWoStyle = baseFontName.split('-')[0];
var flags = (serifFonts[fontNameWoStyle] ||
(fontNameWoStyle.search(/serif/gi) != -1) ? FontFlags.Serif : 0) |
(metrics.monospace ? FontFlags.FixedPitch : 0) |
(symbolsFonts[fontNameWoStyle] ? FontFlags.Symbolic :
FontFlags.Nonsymbolic);