🔧 Improve T-Rex effect

docs/changelog.md

@@ -14,6 +14,7 @@
 * The source code has received a **major refactoring**. This will make the addition of new effects much easier in the future.
 * The **layout of the settings dialog** has been reworked to make it easier to expand it in the future.
 * The lower limit of the **animation time of the TV Effect** has been reduced.
+* The T-Rex-Attack effect is not shown in fully transparent regions of a window any more.
 
 #### Fixes
 

src/TRexEffect.js

@@ -214,15 +214,18 @@ if (utils.isInShellProcess()) {
           vec2 offset = vec2(dFdx(scratchMap), dFdy(scratchMap)) * uProgress * 0.5;
           cogl_color_out = texture2D(uTexture, coords + offset);
 
-          // Hide scratched out parts.
-          cogl_color_out *= (scratchMap > uProgress ? 1 : 0);
-
           // Add colorful flashes.
           float flashIntensity = 1.0 / FLASH_INTENSITY * (scratchMap - uProgress) + 1;
           if (flashIntensity < 0 || flashIntensity >= 1) {
             flashIntensity = 0;
           }
 
+          // Hide flashes where there is now window.
+          flashIntensity *= cogl_color_out.a;
+
+          // Hide scratched out parts.
+          cogl_color_out *= (scratchMap > uProgress ? 1 : 0);
+
           vec3 flashColor = vec3(${color.red / 255},
           ${color.green / 255},
           ${color.blue / 255}) * ${color.alpha / 255};