fix checksum of IEND chunk

README.md

@@ -0,0 +1,34 @@
+# raytracing
+
+Based on the series <a href="https://raytracing.github.io"><cite>Ray Tracing in One Weekend</cite></a>.
+
+## Scenes
+
+### simple
+![](./docs/simple.png)
+
+```
+java -jar raytracing.jar --samples 5000 --height 1080 SIMPLE
+```
+### squares
+![](./docs/squares.png)
+
+```
+java -jar raytracing.jar --samples 500 --height 1200 SQUARES
+```
+
+### cornell box
+
+![](./docs/cornell_smoke.png)
+
+```
+java -jar raytracing.jar --samples 50000 --height 1200 CORNELL
+```
+
+### cornell box with smoke
+
+![](./docs/cornell_smoke.png)
+
+```
+java -jar raytracing.jar --samples 50000 --height 600 CORNELL_SMOKE
+```

src/main/java/eu/jonahbauer/raytracing/render/ImageFormat.java

@@ -41,6 +41,7 @@ public enum ImageFormat {
         private static final int IHDR_TYPE = 0x49484452;
         private static final int IDAT_TYPE = 0x49444154;
         private static final int IEND_TYPE = 0x49454E44;
+        private static final int IEND_CRC = -1371381630;
 
         @Override
         public void write(@NotNull Canvas image, @NotNull OutputStream out) throws IOException {
@@ -101,7 +102,7 @@ public enum ImageFormat {
         private void writeIEND(@NotNull Canvas image, @NotNull DataOutputStream data) throws IOException {
             data.writeInt(0);
             data.writeInt(IEND_TYPE);
-            data.writeInt(0);
+            data.writeInt(IEND_CRC);
         }
 
         private static class NoCloseDataOutputStream extends DataOutputStream {