From c0059c351f0a8bbdd15f4d0e15ac4fb80c897eaa Mon Sep 17 00:00:00 2001
From: leriomaggio <valeriomaggio@gmail.com>
Date: Sun, 12 Sep 2021 10:29:54 +0100
Subject: [PATCH] Adding support to add alpha over images (to show them as
 disabled)

This will be used in deck import card preview.

Signed-off-by: leriomaggio <valeriomaggio@gmail.com>
---
 .../java/forge/toolbox/imaging/FImagePanel.java    | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/forge-gui-desktop/src/main/java/forge/toolbox/imaging/FImagePanel.java b/forge-gui-desktop/src/main/java/forge/toolbox/imaging/FImagePanel.java
index ef46e3b0f11..438751437fc 100644
--- a/forge-gui-desktop/src/main/java/forge/toolbox/imaging/FImagePanel.java
+++ b/forge-gui-desktop/src/main/java/forge/toolbox/imaging/FImagePanel.java
@@ -18,10 +18,7 @@
 
 package forge.toolbox.imaging;
 
-import java.awt.Dimension;
-import java.awt.Graphics;
-import java.awt.Graphics2D;
-import java.awt.RenderingHints;
+import java.awt.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.event.ComponentAdapter;
@@ -63,6 +60,7 @@ public class FImagePanel extends JPanel {
 
     private double imageScale = 1;
     private int degreesOfRotation = 0;
+    private float alpha = 0f;
 
     // Ensures that when resizing only {@code doPerformancePaint} is used.
     private boolean isResizing = false;
@@ -213,6 +211,8 @@ public class FImagePanel extends JPanel {
         BufferedImage resampledImage = getResampledImage();
         if (resampledImage != null) {
             Graphics2D g2d = (Graphics2D)g;
+            if (alpha > 0)
+                g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha));
             g2d.drawImage(resampledImage, getAffineTransform(resampledImage, false), null);
         }
     }
@@ -252,6 +252,8 @@ public class FImagePanel extends JPanel {
     private void doPerformancePaint(Graphics g) {
         Graphics2D g2d = (Graphics2D)g;
         setRenderingHints(g2d);
+        if (alpha > 0)
+            g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha));
         g2d.drawImage(sourceImage, getAffineTransform(sourceImage, true), null);
     }
 
@@ -342,4 +344,8 @@ public class FImagePanel extends JPanel {
         }
     }
 
+    public void setAlpha(float alphaValue){
+        this.alpha = alphaValue;
+    }
+
 }