feat: RGB Histogram

.gitignore

@@ -1,4 +1,5 @@
 target/
+pictures/
 .settings/
 .project
 .classpath

README.md

@@ -15,13 +15,17 @@ DEVICE=1
 # 30 = All Prefix related implementations at once
 # 31 - 32 = Prefix1 - Prefix2 respectively
 # 40 = Rauschfilter (Spawns a javafx window)
+# 50 = Mandelbrot (Spawns a javafx window)
+# 60 = RGBHistogramm (Spawns a javafx window)
 # DEFAULT = 0
 TARGET=31
 
 # Parameter for various tasks (e.g. if N should be shifted 3 times, MULTI_PARAM should be 3)
 # Targes 2X and 3X depend on this parameter (1 << MULTI_PARAM)
 # Target 4X (N to the left and right of x_0)
-# DEFAULT = 25
+# Target 50 Zoom Factor (20 should be used to get good results)
+# Target 60 filename of a picture (Place in folder $PROJECT_ROOT/pictures/my_pic.jpg) [jpg,bmp,png]
+# DEFAULT = 25 / "lena.bmp"
 MULTI_PARAM=3
 
 mvn -B clean compile assembly:single && java -jar target/*.jar $DEVICE $TARGET $MULTI_PARAM

src/main/java/edu/thi/phga/aparapi_test/App.java

@@ -7,6 +7,7 @@ public class App {
   public static int choice;
   public static OpenCLDevice device;
   public static int multiParam;
+  public static String selectedImage;
   private static void printHeader(final String txt) {
     final String spacer =
       "######################################################################";
@@ -20,15 +21,24 @@ public class App {
       App.choice = Integer.parseInt(args[0]) - 1;
     }
     App.device = Devices.selectDevice();
+    App.device.setMaxWorkGroupSize(256); // used for 2D, 3D derive
+    App.device.setMaxWorkItemSize(0, 256); // used for 1D
+    App.device.setMaxWorkItemSize(1, 16); // used for 2D
 
     int target = 0;
     if (args.length > 1) {
       target = Integer.parseInt(args[1]);
     }
     App.multiParam = 25;
+    App.selectedImage = "lena.bmp";
     if (args.length > 2) {
-      App.multiParam = Integer.parseInt(args[2]);
+      if (target >= 60 && target < 70)
+        App.selectedImage = args[2];
+      else {
+        App.multiParam = Integer.parseInt(args[2]);
+      }
     }
+    App.selectedImage = "file:./pictures/" + App.selectedImage;
     final int[] b;
     switch (target) {
       case 0:
@@ -116,6 +126,10 @@ public class App {
         System.out.println("Spawning window Mandelbrot");
         Application.launch(Mandelbrot.class);
         break;
+      case 60:
+        System.out.println("Spawning window RGBHistogramm");
+        Application.launch(RGBHistogramm.class);
+        break;
     }
   }
 }

src/main/java/edu/thi/phga/aparapi_test/OpenCLGetMemoryInfo.java

@@ -5,11 +5,16 @@ import com.aparapi.device.Device;
 public class OpenCLGetMemoryInfo {
   public static void getInfo() {
     int localMem = (int) App.device.getLocalMemSize();
+    int maxAlloc = (int) App.device.getMaxMemAllocSize();
+    int maxWISize1 = (int) App.device.getMaxWorkItemSize()[0];
+    int maxWISize2 = (int) App.device.getMaxWorkItemSize()[1];
+    int maxWISize3 = (int) App.device.getMaxWorkItemSize()[2];
     int maxWGSize = App.device.getMaxWorkGroupSize();
     int localSize = Math.min(maxWGSize, localMem / 4);
 
-    System.out.printf("Memsize: %d, Max-WGSize: %d, LocalSize: %d\n",
+    System.out.printf("LocalMemsize: %d KB\nMaxMemAlloc: %dMB\n" +
-      localMem, maxWGSize, localSize);
+      "MaxWorkItemSizes Dim(1,2,3): %d, %d, %d\nMax-WGSize: %d\nLocalSize: %d\n",
+      localMem / 1024, maxAlloc / 1024 / 1024, maxWISize1, maxWISize2, maxWISize3, maxWGSize, localSize);
 
   }
 }

src/main/java/edu/thi/phga/aparapi_test/OpenCLPrefix1.java

@@ -10,7 +10,7 @@ public class OpenCLPrefix1 {
     int N = a.length;
     int b[] = new int[N * 2];
     java.util.Arrays.fill(b, 1);
-    Range r = Range.create(App.device, N, 4);
+    Range r = Range.create(App.device, N);
     OpenCLPrefix1Kernel k = new OpenCLPrefix1Kernel(b);
     k.setExplicit(true);
     k.setStepSize(1);

src/main/java/edu/thi/phga/aparapi_test/OpenCLPrefix2.java

@@ -18,7 +18,9 @@ public class OpenCLPrefix2 {
     int N = a.length;
     int b[] = new int[N];
     java.util.Arrays.fill(b, 1);
-    Range r = Range.create(App.device, N, 4);
+    Range r = Range.create(App.device, N);
+    System.out.println("Range: " + r);
+
     OpenCLPrefix2Kernel k = new OpenCLPrefix2Kernel(a, b);
     k.setExplicit(true);
     k.setStepSize(1);

src/main/java/edu/thi/phga/aparapi_test/RGBHistogramm.java

@@ -0,0 +1,113 @@
+package edu.thi.phga.aparapi_test;
+
+import java.util.Arrays;
+import java.util.Map;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
+
+import com.aparapi.Range;
+
+import javafx.application.Application;
+import javafx.geometry.Bounds;
+import javafx.geometry.Rectangle2D;
+import javafx.scene.Node;
+import javafx.scene.Scene;
+import javafx.scene.canvas.Canvas;
+import javafx.scene.canvas.GraphicsContext;
+import javafx.scene.effect.BlendMode;
+import javafx.scene.image.Image;
+import javafx.scene.image.ImageView;
+import javafx.scene.image.PixelFormat;
+import javafx.scene.layout.HBox;
+import javafx.scene.paint.Color;
+import javafx.stage.Screen;
+import javafx.stage.Stage;
+
+public class RGBHistogramm extends Application {
+  private static String DATEI = App.selectedImage;
+  private static Rectangle2D screen = Screen.getPrimary().getBounds();
+  private static final int HGAP = 10;
+  // Abstand Bild/Histogramm
+  private static final int MIN_HISTO_WIDTH = 256;
+  private static final int MAX_HISTO_WIDTH = 512;
+  private int[] r = new int[256];
+  private int[] g = new int[256];
+  private int[] b = new int[256];
+
+  @Override
+  public void start(Stage stage) {
+    System.out.println("File: " + DATEI);
+    Image image = new Image(DATEI);
+    int w = (int) image.getWidth();
+    int h = (int) image.getHeight();
+    int[] pixel = new int[w * h];
+    System.out.println("Image: " + w + "x" + h);
+
+    image.getPixelReader().getPixels(
+      0, 0, w, h, PixelFormat.getIntArgbInstance(), pixel, 0, w
+    );
+    Range range = Range.create2D(App.device, w, h);
+    System.out.println("Range: " + range);
+
+    // for (int i = 0; i < 20; i++) {
+    //   // 1111 1111 0000 0000
+    //   int col = 0xff00;
+    //   int val = (col & pixel[i]) >> 8;
+    //   // int res = val / col;
+    //   System.out.printf("%d: %x & %x = %d (%x)\n", pixel[i], pixel[i],
+    //     col, val, val);
+    // }
+
+    new RGBHistogrammKernel(pixel, r, g, b).execute(range);
+
+    ImageView view = scale(image);
+    HBox hbox = new HBox(HGAP, view, histogram(view));
+
+    stage.setScene(new Scene(hbox));
+    stage.setTitle("KAO: RGB-Histogram (" + DATEI + ")[" + w + "x" + h + "]");
+    stage.setResizable(false);
+    stage.sizeToScene();
+    stage.show();
+  }
+  private ImageView scale(Image image) {
+    // Skaliere das Bild so, dass es auf den Bildschirm passt
+    // und für das Histogramm wenigstens die minimale Breite bleibt.
+    ImageView view = new ImageView(image);
+    double maxWidth = screen.getWidth () * 0.7 - HGAP - MIN_HISTO_WIDTH;
+    double maxHeight = screen.getHeight() * 0.8;
+    if (image.getWidth () > maxWidth ) view.setFitWidth (maxWidth );
+    if (image.getHeight() > maxHeight) view.setFitHeight(maxHeight);
+    view.setPreserveRatio(true);
+    return view;
+  }
+
+  private Node histogram(ImageView view) {
+    Bounds scaledImage = view.getBoundsInParent();
+    double deltaW = screen.getWidth() - scaledImage.getWidth();
+    double width = Math.min(deltaW, MAX_HISTO_WIDTH);
+    double height = scaledImage.getHeight();
+    Canvas histo = new Canvas(width, height);
+    // Ermittle für die y-Skalierung den maximalen Häufigkeitswert.
+    int max = Stream.of(r, g, b)
+      .flatMapToInt(IntStream::of)
+      .max()
+      .getAsInt();
+    draw(histo, width / 256, height / max);
+    return histo;
+  }
+
+  private void draw(Canvas histo, double xScale, double yScale) {
+    GraphicsContext graphics = histo.getGraphicsContext2D();
+    graphics.setLineWidth(3);
+    graphics.setGlobalBlendMode(BlendMode.ADD);
+    double[] x = new double[256], y = new double[256];
+    Arrays.parallelSetAll(x, i -> i * xScale);
+    var pairs = Map.of(r, Color.RED, g, Color.GREEN, b, Color.BLUE);
+    double h = histo.getHeight();
+    for (var pair : pairs.entrySet()) {
+      Arrays.parallelSetAll(y, i -> h - pair.getKey()[i] * yScale);
+      graphics.setStroke(pair.getValue());
+      graphics.strokePolyline(x, y, 256);
+    }
+  }
+}

src/main/java/edu/thi/phga/aparapi_test/RGBHistogrammKernel.java

@@ -0,0 +1,38 @@
+package edu.thi.phga.aparapi_test;
+
+import com.aparapi.Kernel;
+
+public class RGBHistogrammKernel extends Kernel {
+  private int[] pixel;
+  private int[] r;
+  private int[] g;
+  private int[] b;
+
+  public RGBHistogrammKernel(int[] pixel, int[] r, int[] g, int[] b) {
+    this.pixel = pixel;
+    this.r = r;
+    this.g = g;
+    this.b = b;
+  }
+
+  @Override
+  public void run() {
+    int x = getGlobalId(0);
+    int y = getGlobalId(1);
+
+    // int redM   = 0x00ff0000;
+    // int greenM = 0x0000ff00;
+    // int blueM  = 0x000000ff;
+
+    int index = y * getGlobalSize(0) + x;
+
+    // atomicAdd(r,(pixel[index] & redM) >> 16, 1);
+    // atomicAdd(g,(pixel[index] & greenM) >> 8, 1);
+    // atomicAdd(b, pixel[index] & blueM, 1);
+
+    int cp = pixel[index];
+    atomicAdd(r, (cp >> 16) & 0xff, 1);
+    atomicAdd(g, (cp >> 8) & 0xff, 1);
+    atomicAdd(b, cp & 0xff, 1);
+  }
+}