X-Git-Url: https://git.lyx.org/gitweb/?a=blobdiff_plain;f=src%2FLength.h;h=2a8f0642108602fb70c8f01195f47fff31e4322d;hb=2ebd535e99ebd1578209bf3e5890b06871e1dfeb;hp=435eea053576ab397c2d620edbee03102340e01d;hpb=41740ea915ee7a95206d780b6256e660cef39c6e;p=lyx.git

diff --git a/src/Length.h b/src/Length.h
index 435eea0535..2a8f064210 100644
--- a/src/Length.h
+++ b/src/Length.h
@@ -20,6 +20,8 @@
 
 namespace lyx {
 
+class MetricsBase;
+
 // Solaris/x86 version 9 and earlier define these
 #undef PC
 #undef SP
@@ -87,9 +89,20 @@ public:
 	std::string const asLatexString() const;
 	/// return string representation for HTML
 	std::string const asHTMLString() const;
-	/// return the on-screen size of this length
+	/** return the on-screen size of this length.
+	 *
+	 *	If the second argument is not provided, then the unit EM will
+	 *	only be approximated. It is better if possible to use
+	 *	FontMetrics::em() to get this value.
+	 */
 	int inPixels(int text_width, int em_width = 0) const;
+	/** return the on-screen size of this length
+	 *
+	 *  This version of the function uses the right EM definition.
+	 */
+	int inPixels(MetricsBase const &) const;
 	/// return the value in Big Postscript points.
+	/// Caution: Inaccurate for em, ex, mu and percent units.
 	int inBP() const;
 
 	/// return the default unit (centimeter or inch)
@@ -98,6 +111,8 @@ public:
 	friend bool isValidLength(std::string const & data, Length * result);
 
 private:
+	/// Convert value to inch for text width and em width given in inch
+	double inInch(double text_width, double em_width) const;
 	///
 	double val_;
 	///