Yay rescaling

Author: RhythmicSys

src/main/java/simplexity/entityicons/ImageController.java

@@ -12,11 +12,16 @@
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 
+
 @RestController
 @RequestMapping("/api/v1/textures")
 public class ImageController {
@@ -31,25 +36,48 @@ public ImageController(ResourceLoader resourceLoader) {
     }
 
     @GetMapping(value = "/{category}/{filename}/{size}", produces = MediaType.IMAGE_PNG_VALUE)
-    public ResponseEntity<byte[]> getImage(@PathVariable String category, @PathVariable String filename, @PathVariable int size) {
+    public ResponseEntity<byte[]> getImage(
+            @PathVariable String category,
+            @PathVariable String filename,
+            @PathVariable int size,
+            @RequestParam(required = false, defaultValue = "1") int scale) {
         String filePath = "file:" + assetsBasePath + "/png_files/" + category + "/" + size + "x" + size + "/" + filename + ".png";
         Resource resource = resourceLoader.getResource(filePath);
-        if (resource.exists()) {
-            try (InputStream inputStream = resource.getInputStream()) {
-                byte[] imageBytes = StreamUtils.copyToByteArray(inputStream);
-                String downloadName = filename + "_" + size + "x" + size;
-                HttpHeaders headers = new HttpHeaders();
-                headers.add(HttpHeaders.CONTENT_TYPE, "image/png");
-                headers.add(HttpHeaders.CONTENT_DISPOSITION, String.format("inline; filename=%s", downloadName));
-
-                return new ResponseEntity<>(imageBytes, headers, HttpStatus.OK);
+        if (!resource.exists()) {
+            return ResponseEntity.status(HttpStatus.NOT_FOUND).build();
+
+        }
+        byte[] imageBytes;
+        try (InputStream inputStream = resource.getInputStream()) {
+            imageBytes = StreamUtils.copyToByteArray(inputStream);
+        } catch (IOException e) {
+            e.printStackTrace();
+            return ResponseEntity.status(HttpStatus.ALREADY_REPORTED).build();
+        }
+        String downloadName = filename + "_" + size + "x" + size;
+        if (scale > 1) {
+            BufferedImage rescaledImage = Rescaler.rescaleImage(filePath, scale, size);
+            if (rescaledImage == null) {
+                return ResponseEntity.status(HttpStatus.CONFLICT).build();
+            }
+            ByteArrayOutputStream imageByteArrayOutputStream = new ByteArrayOutputStream();
+            try {
+                ImageIO.write(rescaledImage, "png", imageByteArrayOutputStream);
             } catch (IOException e) {
                 e.printStackTrace();
-                return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build();
+                return ResponseEntity.status(HttpStatus.FAILED_DEPENDENCY).build();
             }
-        } else {
-            return ResponseEntity.status(HttpStatus.NOT_FOUND).build();
+            imageBytes = imageByteArrayOutputStream.toByteArray();
+            downloadName = filename + "_" + (size * scale) + "x" + (size * scale);
+
         }
+
+        HttpHeaders headers = new HttpHeaders();
+        headers.add(HttpHeaders.CONTENT_TYPE, "image/png");
+        headers.add(HttpHeaders.CONTENT_DISPOSITION, String.format("inline; filename=%s", downloadName));
+        return new ResponseEntity<>(imageBytes, headers, HttpStatus.OK);
+
+
     }
 
 }

src/main/java/simplexity/entityicons/Rescaler.java

@@ -0,0 +1,29 @@
+package simplexity.entityicons;
+
+import javax.imageio.ImageIO;
+import java.awt.Graphics2D;
+import java.awt.RenderingHints;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+
+public class Rescaler {
+
+    public static BufferedImage rescaleImage(String path, int multiplier, int originalSize) {
+        BufferedImage originalImage;
+        try {
+            path = path.substring(5);
+            File file = new File(path);
+            originalImage = ImageIO.read(file);
+        } catch (IOException e) {
+            return null;
+        }
+        int size = multiplier * originalSize;
+        BufferedImage resizedImage = new BufferedImage(size, size, BufferedImage.TYPE_INT_ARGB);
+        Graphics2D graphicsImage = resizedImage.createGraphics();
+        graphicsImage.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR);
+        graphicsImage.drawImage(originalImage, 0,0, size, size,null);
+        graphicsImage.dispose();
+        return resizedImage;
+    }
+}