GH-1197 add console log color adaptation

rainbow library was part of KDE - KGuiAddons

4 files changed, 59 insertions, 9 deletions

diff --git a/application/CMakeLists.txt b/application/CMakeLists.txt
index ae4c0a88..a1a91969 100644
--- a/application/CMakeLists.txt
+++ b/application/CMakeLists.txt
@@ -129,6 +129,8 @@ SET(MULTIMC_SOURCES
 	InstanceProxyModel.cpp
 	VersionProxyModel.h
 	VersionProxyModel.cpp
+	Colors.h
+	Colors.cpp
 
 	# GUI - windows
 	MainWindow.h
@@ -325,7 +327,6 @@ else()
 	list(APPEND MULTIMC_SOURCES Platform_Other.cpp)
 endif()
 
-
 # Link additional libraries
 if(WIN32)
 	set(MultiMC_LINK_ADDITIONAL_LIBS ${MultiMC_LINK_ADDITIONAL_LIBS} Qt5::WinMain)
@@ -341,8 +342,8 @@ qt5_add_resources(MULTIMC_RESOURCES ${MULTIMC_QRCS})
 add_executable(MultiMC MACOSX_BUNDLE WIN32 ${MULTIMC_SOURCES} ${MULTIMC_UI} ${MULTIMC_RESOURCES} ${MULTIMC_RCS})
 target_link_libraries(MultiMC MultiMC_logic xz-embedded unpack200 iconfix libUtil LogicalGui
 	${QUAZIP_LIBRARIES} Qt5::Core Qt5::Xml Qt5::Widgets Qt5::Network Qt5::Concurrent
-	hoedown
-		${MultiMC_LINK_ADDITIONAL_LIBS})
+		hoedown rainbow
+			${MultiMC_LINK_ADDITIONAL_LIBS})
 
 ################################ INSTALLATION AND PACKAGING ################################
 
diff --git a/application/Colors.cpp b/application/Colors.cpp
new file mode 100644
index 00000000..8812c93d
--- /dev/null
+++ b/application/Colors.cpp
@@ -0,0 +1,26 @@
+#include "Colors.h"
+
+/**
+ * Blend the color with the front color, adapting to the back color
+ */
+QColor Color::blend(QColor front, QColor back, QColor color, uchar ratio)
+{
+	Q_ASSERT(front.isValid());
+	Q_ASSERT(back.isValid());
+	if (Rainbow::luma(front) > Rainbow::luma(back))
+	{
+		// for dark color schemes, produce a fitting color first
+		color = Rainbow::tint(front, color, 0.5);
+	}
+	// adapt contrast
+	return Rainbow::mix(front, color, float(ratio) / float(0xff));
+}
+
+/**
+ * Blend the color with the back color
+ */
+QColor Color::blendBackground(QColor back, QColor color, uchar ratio)
+{
+	// adapt contrast
+	return Rainbow::mix(back, color, float(ratio) / float(0xff));
+}
diff --git a/application/Colors.h b/application/Colors.h
new file mode 100644
index 00000000..8825f39f
--- /dev/null
+++ b/application/Colors.h
@@ -0,0 +1,15 @@
+#pragma once
+#include <QtGui/QColor>
+#include <rainbow.h>
+namespace Color
+{
+/**
+ * Blend the color with the front color, adapting to the back color
+ */
+QColor blend(QColor front, QColor back, QColor color, uchar ratio);
+
+/**
+ * Blend the color with the back color
+ */
+QColor blendBackground(QColor back, QColor color, uchar ratio);
+}
diff --git a/application/pages/LogPage.cpp b/application/pages/LogPage.cpp
index 77d5d6b8..280f64d0 100644
--- a/application/pages/LogPage.cpp
+++ b/application/pages/LogPage.cpp
@@ -10,6 +10,7 @@
 #include "launch/LaunchTask.h"
 #include <settings/Setting.h>
 #include "GuiUtil.h"
+#include <Colors.h>
 
 LogPage::LogPage(std::shared_ptr<LaunchTask> proc, QWidget *parent)
 	: QWidget(parent), ui(new Ui::LogPage), m_process(proc)
@@ -203,31 +204,38 @@ void LogPage::write(QString data, MessageLevel::Enum mode)
 	QListIterator<QString> iter(filtered);
 	QTextCharFormat format(*defaultFormat);
 
+	auto origForeground = ui->text->palette().color(ui->text->foregroundRole());
+	auto origBackground = ui->text->palette().color(ui->text->backgroundRole());
+	auto foreground = [&](QColor foreColor)
+	{
+		format.setForeground(Color::blend(origForeground, origBackground, foreColor, 255));
+	};
 	switch(mode)
 	{
 		case MessageLevel::MultiMC:
 		{
-			format.setForeground(QColor("blue"));
+			foreground(QColor("purple"));
 			break;
 		}
 		case MessageLevel::Debug:
 		{
-			format.setForeground(QColor("green"));
+			foreground(QColor("green"));
 			break;
 		}
 		case MessageLevel::Warning:
 		{
-			format.setForeground(QColor("orange"));
+			foreground(QColor("orange"));
 			break;
 		}
 		case MessageLevel::Error:
 		{
-			format.setForeground(QColor("red"));
+			foreground(QColor("red"));
 			break;
 		}
 		case MessageLevel::Fatal:
 		{
-			format.setForeground(QColor("red"));
+			origBackground = QColor("black");
+			foreground(QColor("red"));
 			format.setBackground(QColor("black"));
 			break;
 		}
@@ -235,7 +243,7 @@ void LogPage::write(QString data, MessageLevel::Enum mode)
 		case MessageLevel::Message:
 		default:
 		{
-			// do nothing, keep original
+			foreground(QColor("black"));
 		}
 	}