[smuxi: 4/7] Frontend-STFL: Ensure text color contrast (closes #1033).

[Mirco M. M. Bauer <mmmbauer src gnome org>]

commit 662e3aa1aca8da6d7a5afae85395fa8594b9fb7b
Author: Ondřej Hošek <ondra hosek gmail com>
Date:   Sat Mar 14 21:56:44 2015 +0100

    Frontend-STFL: Ensure text color contrast (closes #1033).
    
    Make the terminal background color configurable as
    STFL/Interface/TerminalBackgroundColor and use GetBestTextColor to ensure
    sufficient contrast.

 src/Frontend-STFL/Frontend.cs       |    3 +++
 src/Frontend-STFL/Views/ChatView.cs |   10 +++++++++-
 2 files changed, 12 insertions(+), 1 deletions(-)
---
diff --git a/src/Frontend-STFL/Frontend.cs b/src/Frontend-STFL/Frontend.cs
index 360511a..63706e3 100644
--- a/src/Frontend-STFL/Frontend.cs
+++ b/src/Frontend-STFL/Frontend.cs
@@ -157,6 +157,9 @@ namespace Smuxi.Frontend.Stfl
             _FrontendConfig = new FrontendConfig(UIName);
             // loading and setting defaults
             _FrontendConfig.Load();
+            if (_FrontendConfig[Frontend.UIName + "/Interface/TerminalBackgroundColor"] == null) {
+                _FrontendConfig[Frontend.UIName + "/Interface/TerminalBackgroundColor"] = "#000000";
+            }
             _FrontendConfig.Save();
 
             if (_FrontendConfig.IsCleanConfig) {
diff --git a/src/Frontend-STFL/Views/ChatView.cs b/src/Frontend-STFL/Views/ChatView.cs
index 9a24106..950aa76 100644
--- a/src/Frontend-STFL/Views/ChatView.cs
+++ b/src/Frontend-STFL/Views/ChatView.cs
@@ -271,8 +271,16 @@ namespace Smuxi.Frontend.Stfl
                     var tags = new List<string>();
                     if (txtPart.ForegroundColor != TextColor.None) {
                         var palette = TextColorPalettes.LinuxConsole;
+                        var foregroundColor = txtPart.ForegroundColor;
+                        var backgroundColorString = (string)Frontend.FrontendConfig[Frontend.UIName + 
"/Interface/TerminalBackgroundColor"];
+                        if (!String.IsNullOrEmpty(backgroundColorString)) {
+                            foregroundColor = TextColorTools.GetBestTextColor(
+                                foregroundColor,
+                                TextColor.Parse(backgroundColorString)
+                            );
+                        }
                         var color = TextColorTools.GetNearestColor(
-                            txtPart.ForegroundColor,
+                            foregroundColor,
                             palette
                         );
                         var colorNumber = palette.IndexOf(color);