1 files changed, 37 insertions, 0 deletions
diff --git a/src/ViewStyle.cxx b/src/ViewStyle.cxx
index af808f3c1..2983bb0c0 100644
--- a/src/ViewStyle.cxx
+++ b/src/ViewStyle.cxx
@@ -434,6 +434,43 @@ void ViewStyle::CalcLargestMarkerHeight() {
 	}
 }
 
+// See if something overrides the line background color:  Either if caret is on the line
+// and background color is set for that, or if a marker is defined that forces its background
+// color onto the line, or if a marker is defined but has no selection margin in which to
+// display itself (as long as it's not an SC_MARK_EMPTY marker).  These are checked in order
+// with the earlier taking precedence.  When multiple markers cause background override,
+// the color for the highest numbered one is used.
+ColourOptional ViewStyle::Background(int marksOfLine, bool caretActive, bool lineContainsCaret) const {
+	ColourOptional background;
+	if ((caretActive || alwaysShowCaretLineBackground) && showCaretLineBackground && (caretLineAlpha == SC_ALPHA_NOALPHA) && lineContainsCaret) {
+		background = ColourOptional(caretLineBackground, true);
+	}
+	if (!background.isSet && marksOfLine) {
+		int marks = marksOfLine;
+		for (int markBit = 0; (markBit < 32) && marks; markBit++) {
+			if ((marks & 1) && (markers[markBit].markType == SC_MARK_BACKGROUND) &&
+				(markers[markBit].alpha == SC_ALPHA_NOALPHA)) {
+				background = ColourOptional(markers[markBit].back, true);
+			}
+			marks >>= 1;
+		}
+	}
+	if (!background.isSet && maskInLine) {
+		int marksMasked = marksOfLine & maskInLine;
+		if (marksMasked) {
+			for (int markBit = 0; (markBit < 32) && marksMasked; markBit++) {
+				if ((marksMasked & 1) && (markers[markBit].markType != SC_MARK_EMPTY) &&
+					(markers[markBit].alpha == SC_ALPHA_NOALPHA)) {
+					background = ColourOptional(markers[markBit].back, true);
+				}
+				marksMasked >>= 1;
+			}
+		}
+	}
+	return background;
+}
+
+
 ColourDesired ViewStyle::WrapColour() const {
 	if (whitespaceColours.fore.isSet)
 		return whitespaceColours.fore;