Merge pull request 'Revert "Make the burn-in look more like the real thing."' (#862) from revert-burnin into master

Reviewed-on: #862

.gitignore

@@ -48,3 +48,6 @@ cool-retro-term
 
 .DS_Store
 *.app
+
+# IntelliJ
+.idea

app/qml/ApplicationSettings.qml

@@ -32,7 +32,7 @@ QtObject {
     readonly property real maximumFontScaling: 2.50
 
     readonly property real minBurnInFadeTime: 160
-    readonly property real maxBurnInFadeTime: 160000
+    readonly property real maxBurnInFadeTime: 1600
 
     property bool isMacOS: Qt.platform.os === "osx"
 

app/qml/BurnInEffect.qml

@@ -29,8 +29,8 @@ Loader {
     property real lastUpdate: 0
     property real prevLastUpdate: 0
 
-    property real burnIn: appSettings.burnIn;
+    property real burnIn: appSettings.burnIn
-    property real burnInFadeTime: (1 / Utils.lint(_minBurnInFadeTime, _maxBurnInFadeTime, burnIn))*64
+    property real burnInFadeTime: 1 / Utils.lint(_minBurnInFadeTime, _maxBurnInFadeTime, burnIn)
     property real _minBurnInFadeTime: appSettings.minBurnInFadeTime
     property real _maxBurnInFadeTime: appSettings.maxBurnInFadeTime
 
@@ -146,8 +146,9 @@ Loader {
                     float prevMask = accColor.a;
                     float currMask = rgb2grey(txtColor);
 
-                    highp float blurDecay = clamp(pow(0.5, burnInTime * (lastUpdate - prevLastUpdate)), 0.0, 1.0);
+                    highp float blurDecay = clamp((lastUpdate - prevLastUpdate) * burnInTime, 0.0, 1.0);
-                    vec3 blurColor = accColor.rgb * vec3(blurDecay);
+                    blurDecay = max(0.0, blurDecay - prevMask);
+                    vec3 blurColor = accColor.rgb - vec3(blurDecay);
                     vec3 color = max(blurColor, txtColor);
 
                     gl_FragColor = vec4(color, currMask);

app/qml/ShaderTerminal.qml

@@ -321,8 +321,8 @@ Item {
 
                  (burnIn !== 0 ? "
                      vec4 txt_blur = texture2D(burnInSource, staticCoords);
-                     float blurDecay = clamp(pow(0.5, burnInTime * (time - burnInLastUpdate)), 0.0, 1.0);
+                     float blurDecay = clamp((time - burnInLastUpdate) * burnInTime, 0.0, 1.0);
-                     vec3 burnInColor = txt_blur.rgb * vec3(blurDecay);
+                     vec3 burnInColor = 0.65 * (txt_blur.rgb - vec3(blurDecay));
                      txt_color = max(txt_color, convertWithChroma(burnInColor));"
                  : "") +