From 300d5daa2b98789081143c16fa760d9a827367e2 Mon Sep 17 00:00:00 2001
From: Fahad Hasan Pathik <contact.fahadpathik@gmail.com>
Date: Thu, 25 Apr 2019 21:08:03 +0600
Subject: [PATCH] Crop Inverse feature added

---
 effects/shaders/crop.frag | 19 ++++++++++++++-----
 effects/shaders/crop.xml  |  3 +++
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/effects/shaders/crop.frag b/effects/shaders/crop.frag
index 7fed98944..0cfbeeba8 100644
--- a/effects/shaders/crop.frag
+++ b/effects/shaders/crop.frag
@@ -5,6 +5,7 @@ uniform float top;
 uniform float right;
 uniform float bottom;
 uniform float feather;
+uniform bool invert;
 
 uniform mediump float amount_val;
 uniform sampler2D myTexture;
@@ -25,10 +26,18 @@ void main(void) {
 		if (bottom > 0.0) alpha = alpha * clamp((((1.0-vTexCoord.y)+(0.5/f))-(bottom*0.01))*f, 0.0, 1.0); // bottom
 	}
 
-	gl_FragColor = vec4(
-		textureColor.r*alpha,
-		textureColor.g*alpha,
-		textureColor.b*alpha,
+	if (invert)
+	{gl_FragColor = vec4(
+		textureColor.r*(1.0 - alpha),
+		textureColor.g*(1.0 - alpha),
+		textureColor.b*(1.0 - alpha),
+		1.0 - alpha
+	);}
+	else{
+		gl_FragColor = vec4(
+		textureColor.r*(alpha),
+		textureColor.g*(alpha),
+		textureColor.b*(alpha),
 		alpha
-	);
+	);}
 }
\ No newline at end of file
diff --git a/effects/shaders/crop.xml b/effects/shaders/crop.xml
index caa8a578c..be819a988 100644
--- a/effects/shaders/crop.xml
+++ b/effects/shaders/crop.xml
@@ -16,4 +16,7 @@
 		<field type="double" min="0" default="0" id="feather"/>
 	</row>
 	<shader vert="common.vert" frag="crop.frag"/>
+	<row name="Invert">
+		<field type="bool" default="0" id="invert"/>
+	</row>
 </effect>
\ No newline at end of file