From 699b8d69dd918d820dfb030e5385a8509de20434 Mon Sep 17 00:00:00 2001
From: Hammy <sgoudham@gmail.com>
Date: Thu, 23 Sep 2021 01:18:44 +0100
Subject: [PATCH] Add ImageService

---
 .../me/goudham/service/EnsoImageService.java  | 64 +++++++++++++++++++
 .../java/me/goudham/service/ImageService.java | 12 ++++
 2 files changed, 76 insertions(+)
 create mode 100644 src/main/java/me/goudham/service/EnsoImageService.java
 create mode 100644 src/main/java/me/goudham/service/ImageService.java

diff --git a/src/main/java/me/goudham/service/EnsoImageService.java b/src/main/java/me/goudham/service/EnsoImageService.java
new file mode 100644
index 00000000..0ed592d9
--- /dev/null
+++ b/src/main/java/me/goudham/service/EnsoImageService.java
@@ -0,0 +1,64 @@
+package me.goudham.service;
+
+import jakarta.inject.Singleton;
+import java.awt.Color;
+import java.awt.Graphics2D;
+import java.awt.Image;
+import java.awt.color.ColorSpace;
+import java.awt.image.BufferedImage;
+import java.awt.image.ColorConvertOp;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import javax.imageio.ImageIO;
+
+@Singleton
+public class EnsoImageService implements ImageService {
+
+    @Override
+    public BufferedImage resizeImage(BufferedImage bufferedImage, int height, int width) {
+        Image tempImage = bufferedImage.getScaledInstance(width, height, Image.SCALE_SMOOTH);
+        BufferedImage resizedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
+
+        Graphics2D g2d = resizedImage.createGraphics();
+        g2d.drawImage(tempImage, 0, 0, null);
+        g2d.dispose();
+
+        return resizedImage;
+    }
+
+    @Override
+    public byte[] toByteArray(BufferedImage bufferedImage, String fileFormat) throws IOException {
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        ImageIO.write(bufferedImage, fileFormat, baos);
+        return baos.toByteArray();
+    }
+
+    @Override
+    public BufferedImage toImage(byte[] bytes) throws IOException {
+        InputStream inputStream = new ByteArrayInputStream(bytes);
+        return ImageIO.read(inputStream);
+    }
+
+    @Override
+    public BufferedImage toGrayscaleImage(BufferedImage bufferedImage) throws IOException {
+        ColorConvertOp colorConvertOp = new ColorConvertOp(ColorSpace.getInstance(ColorSpace.CS_GRAY), null);
+        BufferedImage grayscaleImage = colorConvertOp.filter(bufferedImage, null);
+        ByteArrayOutputStream os = new ByteArrayOutputStream();
+        ImageIO.write(grayscaleImage, "png", os);
+        return grayscaleImage;
+    }
+
+    @Override
+    public void invertImage(BufferedImage bufferedImage) {
+        for (int x = 0; x < bufferedImage.getWidth(); x++) {
+            for (int y = 0; y < bufferedImage.getHeight(); y++) {
+                int rgba = bufferedImage.getRGB(x, y);
+                Color col = new Color(rgba, true);
+                col = new Color(255 - col.getRed(),255 - col.getGreen(),255 - col.getBlue());
+                bufferedImage.setRGB(x, y, col.getRGB());
+            }
+        }
+    }
+}
diff --git a/src/main/java/me/goudham/service/ImageService.java b/src/main/java/me/goudham/service/ImageService.java
new file mode 100644
index 00000000..fdca19c1
--- /dev/null
+++ b/src/main/java/me/goudham/service/ImageService.java
@@ -0,0 +1,12 @@
+package me.goudham.service;
+
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+
+public interface ImageService {
+    BufferedImage resizeImage(BufferedImage bufferedImage, int height, int width);
+    byte[] toByteArray(BufferedImage bufferedImage, String fileFormat) throws IOException;
+    BufferedImage toImage(byte[] bytes) throws IOException;
+    BufferedImage toGrayscaleImage(BufferedImage bufferedImage) throws IOException;
+    void invertImage(BufferedImage bufferedImage);
+}