+bool LyXLength::zero() const
+{
+ return val_ == 0.0;
+}
+
+
+int LyXLength::inPixels(int default_width, int default_height) const
+{
+ // Zoom factor specified by user in percent
+ double const zoom = lyxrc.zoom / 100.0; // [percent]
+
+ // DPI setting for monitor: pixels/inch
+ double const dpi = lyxrc.dpi; // screen resolution [pixels/inch]
+
+ // Pixel values are scaled so that the ratio
+ // between lengths and font sizes on the screen
+ // is the same as on paper.
+
+ // we don't care about sign of value, we
+ // display negative space with text too
+ double result = 0.0;
+ int val_sign = val_ < 0.0 ? -1 : 1;
+
+ switch (unit_) {
+ case LyXLength::SP:
+ // Scaled point: sp = 1/65536 pt
+ result = zoom * dpi * val_
+ / (72.27 * 65536); // 4736286.7
+ break;
+ case LyXLength::PT:
+ // Point: 1 pt = 1/72.27 inch
+ result = zoom * dpi * val_
+ / 72.27; // 72.27
+ break;
+ case LyXLength::BP:
+ // Big point: 1 bp = 1/72 inch
+ result = zoom * dpi * val_
+ / 72; // 72
+ break;
+ case LyXLength::DD:
+ // Didot: 1157dd = 1238 pt?
+ result = zoom * dpi * val_
+ / (72.27 / (0.376 * 2.845)); // 67.559735
+ break;
+ case LyXLength::MM:
+ // Millimeter: 1 mm = 1/25.4 inch
+ result = zoom * dpi * val_
+ / 25.4; // 25.4
+ break;
+ case LyXLength::PC:
+ // Pica: 1 pc = 12 pt
+ result = zoom * dpi * val_
+ / (72.27 / 12); // 6.0225
+ break;
+ case LyXLength::CC:
+ // Cicero: 1 cc = 12 dd
+ result = zoom * dpi * val_
+ / (72.27 / (12 * 0.376 * 2.845)); // 5.6299779
+ break;
+ case LyXLength::CM:
+ // Centimeter: 1 cm = 1/2.54 inch
+ result = zoom * dpi * val_
+ / 2.54; // 2.54
+ break;
+ case LyXLength::IN:
+ // Inch
+ result = zoom * dpi * val_;
+ break;
+ case LyXLength::EX:
+ // Ex: The height of an "x"
+ result = zoom * val_ * default_height / 2; // what to / width?
+ break;
+ case LyXLength::EM: // what to / width?
+ // Em: The width of an "m"
+ result = zoom * val_ * default_height / 2; // Why 2?
+ break;
+ case LyXLength::MU: // This is probably only allowed in
+ // math mode
+ result = zoom * val_ * default_height;
+ break;
+ case LyXLength::PW: // Always % of workarea
+ case LyXLength::PE:
+ case LyXLength::PP:
+ case LyXLength::PL:
+ result = val_ * default_width / 100;
+ break;
+ case LyXLength::UNIT_NONE:
+ result = 0; // this cannot happen
+ break;
+ }
+ return static_cast<int>(result * val_sign + 0.5);
+}
+
+