1 files changed, 142 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/ui/SurfaceTextureScreenNail.java b/src/com/android/gallery3d/ui/SurfaceTextureScreenNail.java
new file mode 100644
index 000000000..18121e63b
--- /dev/null
+++ b/src/com/android/gallery3d/ui/SurfaceTextureScreenNail.java
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.gallery3d.ui;
+
+import android.annotation.TargetApi;
+import android.graphics.RectF;
+import android.graphics.SurfaceTexture;
+
+import com.android.gallery3d.common.ApiHelper;
+import com.android.gallery3d.glrenderer.ExtTexture;
+import com.android.gallery3d.glrenderer.GLCanvas;
+
+@TargetApi(ApiHelper.VERSION_CODES.HONEYCOMB)
+public abstract class SurfaceTextureScreenNail implements ScreenNail,
+        SurfaceTexture.OnFrameAvailableListener {
+    @SuppressWarnings("unused")
+    private static final String TAG = "SurfaceTextureScreenNail";
+    // This constant is not available in API level before 15, but it was just an
+    // oversight.
+    private static final int GL_TEXTURE_EXTERNAL_OES = 0x8D65;
+
+    protected ExtTexture mExtTexture;
+    private SurfaceTexture mSurfaceTexture;
+    private int mWidth, mHeight;
+    private float[] mTransform = new float[16];
+    private boolean mHasTexture = false;
+
+    public SurfaceTextureScreenNail() {
+    }
+
+    public void acquireSurfaceTexture(GLCanvas canvas) {
+        mExtTexture = new ExtTexture(canvas, GL_TEXTURE_EXTERNAL_OES);
+        mExtTexture.setSize(mWidth, mHeight);
+        mSurfaceTexture = new SurfaceTexture(mExtTexture.getId());
+        setDefaultBufferSize(mSurfaceTexture, mWidth, mHeight);
+        mSurfaceTexture.setOnFrameAvailableListener(this);
+        synchronized (this) {
+            mHasTexture = true;
+        }
+    }
+
+    @TargetApi(ApiHelper.VERSION_CODES.ICE_CREAM_SANDWICH_MR1)
+    private static void setDefaultBufferSize(SurfaceTexture st, int width, int height) {
+        if (ApiHelper.HAS_SET_DEFALT_BUFFER_SIZE) {
+            st.setDefaultBufferSize(width, height);
+        }
+    }
+
+    @TargetApi(ApiHelper.VERSION_CODES.ICE_CREAM_SANDWICH)
+    private static void releaseSurfaceTexture(SurfaceTexture st) {
+        st.setOnFrameAvailableListener(null);
+        if (ApiHelper.HAS_RELEASE_SURFACE_TEXTURE) {
+            st.release();
+        }
+    }
+
+    public SurfaceTexture getSurfaceTexture() {
+        return mSurfaceTexture;
+    }
+
+    public void releaseSurfaceTexture() {
+        synchronized (this) {
+            mHasTexture = false;
+        }
+        mExtTexture.recycle();
+        mExtTexture = null;
+        releaseSurfaceTexture(mSurfaceTexture);
+        mSurfaceTexture = null;
+    }
+
+    public void setSize(int width, int height) {
+        mWidth = width;
+        mHeight = height;
+    }
+
+    public void resizeTexture() {
+        if (mExtTexture != null) {
+            mExtTexture.setSize(mWidth, mHeight);
+            setDefaultBufferSize(mSurfaceTexture, mWidth, mHeight);
+        }
+    }
+
+    @Override
+    public int getWidth() {
+        return mWidth;
+    }
+
+    @Override
+    public int getHeight() {
+        return mHeight;
+    }
+
+    @Override
+    public void draw(GLCanvas canvas, int x, int y, int width, int height) {
+        synchronized (this) {
+            if (!mHasTexture) return;
+            mSurfaceTexture.updateTexImage();
+            mSurfaceTexture.getTransformMatrix(mTransform);
+
+            // Flip vertically.
+            canvas.save(GLCanvas.SAVE_FLAG_MATRIX);
+            int cx = x + width / 2;
+            int cy = y + height / 2;
+            canvas.translate(cx, cy);
+            canvas.scale(1, -1, 1);
+            canvas.translate(-cx, -cy);
+            updateTransformMatrix(mTransform);
+            canvas.drawTexture(mExtTexture, mTransform, x, y, width, height);
+            canvas.restore();
+        }
+    }
+
+    @Override
+    public void draw(GLCanvas canvas, RectF source, RectF dest) {
+        throw new UnsupportedOperationException();
+    }
+
+    protected void updateTransformMatrix(float[] matrix) {}
+
+    @Override
+    abstract public void noDraw();
+
+    @Override
+    abstract public void recycle();
+
+    @Override
+    abstract public void onFrameAvailable(SurfaceTexture surfaceTexture);
+}