From c76e0f115336bb5e94bce1a1b9b3312bc682c0c6 Mon Sep 17 00:00:00 2001
From: Guillaume Munch <gm@lyx.org>
Date: Tue, 14 Jun 2016 21:45:47 +0100
Subject: [PATCH] Make latex highlighter colors compatible with dark theme

Partial fix for #8325
---
 src/frontends/qt4/LaTeXHighlighter.cpp | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/frontends/qt4/LaTeXHighlighter.cpp b/src/frontends/qt4/LaTeXHighlighter.cpp
index 9a9e5459a4..fa949a6e62 100644
--- a/src/frontends/qt4/LaTeXHighlighter.cpp
+++ b/src/frontends/qt4/LaTeXHighlighter.cpp
@@ -19,13 +19,23 @@
 namespace lyx {
 namespace frontend {
 
+
 LaTeXHighlighter::LaTeXHighlighter(QTextDocument * parent)
 	: QSyntaxHighlighter(parent)
 {
-	keywordFormat.setForeground(Qt::darkBlue);
+	auto blend = [](QColor color1, QColor color2) {
+		int r = 0.5 * (color1.red() + color2.red());
+		int g = 0.5 * (color1.green() + color2.green());
+		int b = 0.5 * (color1.blue() + color2.blue());
+		return QColor(r, g, b);
+	};
+	QPalette palette = QPalette();
+	QColor text_color = palette.color(QPalette::Active, QPalette::Text);
+	keywordFormat.setForeground(blend(Qt::blue, text_color));
 	keywordFormat.setFontWeight(QFont::Bold);
-	commentFormat.setForeground(Qt::darkGray);
-	mathFormat.setForeground(Qt::red);
+	commentFormat.setForeground(palette.color(QPalette::Disabled,
+	                                          QPalette::Text));
+	mathFormat.setForeground(blend(Qt::red, text_color));
 	warningFormat.setForeground(Qt::red);
 	warningFormat.setFontWeight(QFont::Bold);
 }