provide better buffer management

3 files changed, 113 insertions, 0 deletions

diff --git a/examples/src/main/java/examples/Buffer.java b/examples/src/main/java/examples/Buffer.java
new file mode 100644
index 0000000..7480589
--- /dev/null
+++ b/examples/src/main/java/examples/Buffer.java
@@ -0,0 +1,41 @@
+package examples;
+
+import org.freedesktop.wayland.client.WlBufferEvents;
+import org.freedesktop.wayland.client.WlBufferProxy;
+import org.freedesktop.wayland.client.WlShmPoolProxy;
+
+import java.nio.ByteBuffer;
+
+
+public class Buffer implements WlBufferEvents {
+
+    private final WlShmPoolProxy wlShmPoolProxy;
+    private final ByteBuffer byteBuffer;
+    private final int width;
+    private final int height;
+
+    public Buffer(final WlShmPoolProxy wlShmPoolProxy, final ByteBuffer byteBuffer, final int width, final int height) {
+        this.wlShmPoolProxy = wlShmPoolProxy;
+        this.byteBuffer = byteBuffer;
+        this.width = width;
+        this.height = height;
+    }
+
+    @Override
+    public void release(final WlBufferProxy emitter) {
+        final BufferPool bufferPool = (BufferPool) this.wlShmPoolProxy.getImplementation();
+        bufferPool.queueBuffer(emitter);
+    }
+
+    public ByteBuffer getByteBuffer() {
+        return byteBuffer;
+    }
+
+    public int getWidth() {
+        return width;
+    }
+
+    public int getHeight() {
+        return height;
+    }
+}
diff --git a/examples/src/main/java/examples/BufferPool.java b/examples/src/main/java/examples/BufferPool.java
new file mode 100644
index 0000000..9d9f523
--- /dev/null
+++ b/examples/src/main/java/examples/BufferPool.java
@@ -0,0 +1,25 @@
+package examples;
+
+
+import org.freedesktop.wayland.client.WlBufferProxy;
+import org.freedesktop.wayland.client.WlShmPoolEvents;
+
+import java.util.LinkedList;
+
+public class BufferPool implements WlShmPoolEvents{
+
+    private LinkedList<WlBufferProxy> bufferQueue = new LinkedList<WlBufferProxy>();
+
+
+    public BufferPool() {
+
+    }
+
+    public void queueBuffer(WlBufferProxy buffer){
+        this.bufferQueue.add(buffer);
+    }
+
+    public WlBufferProxy popBuffer(){
+        return bufferQueue.pop();
+    }
+}
diff --git a/examples/src/main/java/examples/BufferPoolFactory.java b/examples/src/main/java/examples/BufferPoolFactory.java
new file mode 100644
index 0000000..cd2e199
--- /dev/null
+++ b/examples/src/main/java/examples/BufferPoolFactory.java
@@ -0,0 +1,47 @@
+package examples;
+
+import org.freedesktop.wayland.client.WlBufferProxy;
+import org.freedesktop.wayland.client.WlShmPoolProxy;
+import org.freedesktop.wayland.shared.WlShmFormat;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+public class BufferPoolFactory {
+
+    private final Display display;
+
+    public BufferPoolFactory(Display display) {
+        this.display = display;
+    }
+
+    public WlShmPoolProxy create(int width, int height, int size) throws IOException {
+        final int bufferSize = width * height * 4;
+        final ShmPool shmPool = new ShmPool(bufferSize *size);
+        final BufferPool bufferPool = new BufferPool();
+        final WlShmPoolProxy
+                wlShmPoolProxy =
+                this.display.getShmProxy()
+                        .createPool(bufferPool,
+                                    shmPool.getFileDescriptor(),
+                                    bufferSize * size);
+        for(int i = 0; i < size; i++){
+            final int offset = i * bufferSize;
+            final ByteBuffer poolByteBuffer = shmPool.asByteBuffer();
+            poolByteBuffer.position(offset);
+            final ByteBuffer byteBuffer = poolByteBuffer.slice();
+
+            final WlBufferProxy buffer = wlShmPoolProxy.createBuffer(new Buffer(wlShmPoolProxy,
+                                                           byteBuffer,
+                                                           width,
+                                                           height),
+                                                offset,
+                                                width,
+                                                height,
+                                                width * 4,
+                                                WlShmFormat.XRGB8888.getValue());
+            bufferPool.queueBuffer(buffer);
+        }
+        return wlShmPoolProxy;
+    }
+}