Use SurfaceTexture to show Camera preview.

Change-Id: I8bf63dfc5b969ecce51841378b093a650b6f91d8

1 files changed, 116 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..3a8f2b0a4
--- /dev/null
+++ b/src/com/android/gallery3d/ui/SurfaceTextureScreenNail.java
@@ -0,0 +1,116 @@
+/*
+ * 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.graphics.RectF;
+import android.graphics.SurfaceTexture;
+import android.opengl.GLES11Ext;
+import android.util.Log;
+
+import com.android.gallery3d.ui.GLCanvas;
+import com.android.gallery3d.ui.ScreenNail;
+import com.android.gallery3d.ui.ExtTexture;
+
+public abstract class SurfaceTextureScreenNail implements ScreenNail,
+        SurfaceTexture.OnFrameAvailableListener {
+    private static final String TAG = "SurfaceTextureScreenNail";
+    private ExtTexture mExtTexture;
+    private SurfaceTexture mSurfaceTexture;
+    private int mWidth, mHeight;
+    private float[] mTransform = new float[16];
+    private boolean mHasTexture = false;
+
+    public SurfaceTextureScreenNail() {
+    }
+
+    public void acquireSurfaceTexture() {
+        mExtTexture = new ExtTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES);
+        mExtTexture.setSize(mWidth, mHeight);
+        mSurfaceTexture = new SurfaceTexture(mExtTexture.getId());
+        mSurfaceTexture.setOnFrameAvailableListener(this);
+        synchronized (this) {
+            mHasTexture = true;
+        }
+    }
+
+    public SurfaceTexture getSurfaceTexture() {
+        return mSurfaceTexture;
+    }
+
+    public void releaseSurfaceTexture() {
+        synchronized (this) {
+            mHasTexture = false;
+        }
+        mExtTexture.recycle();
+        mExtTexture = null;
+        mSurfaceTexture.release();
+        mSurfaceTexture = null;
+    }
+
+    public void setSize(int width, int height) {
+        mWidth = width;
+        mHeight = height;
+    }
+
+    @Override
+    public int getWidth() {
+        return mWidth;
+    }
+
+    @Override
+    public int getHeight() {
+        return mHeight;
+    }
+
+    @Override
+    public int getRotation() {
+        return 0;
+    }
+
+    @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);
+            canvas.drawTexture(mExtTexture, mTransform, x, y, width, height);
+            canvas.restore();
+        }
+    }
+
+    @Override
+    public void draw(GLCanvas canvas, RectF source, RectF dest) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    abstract public void noDraw();
+
+    @Override
+    abstract public void pauseDraw();
+
+    @Override
+    abstract public void onFrameAvailable(SurfaceTexture surfaceTexture);
+}