1 files changed, 163 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/ui/SlideshowView.java b/src/com/android/gallery3d/ui/SlideshowView.java
new file mode 100644
index 000000000..43784232d
--- /dev/null
+++ b/src/com/android/gallery3d/ui/SlideshowView.java
@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2010 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.Bitmap;
+import android.graphics.PointF;
+
+import com.android.gallery3d.anim.CanvasAnimation;
+import com.android.gallery3d.anim.FloatAnimation;
+import com.android.gallery3d.glrenderer.BitmapTexture;
+import com.android.gallery3d.glrenderer.GLCanvas;
+
+import java.util.Random;
+
+public class SlideshowView extends GLView {
+    @SuppressWarnings("unused")
+    private static final String TAG = "SlideshowView";
+
+    private static final int SLIDESHOW_DURATION = 3500;
+    private static final int TRANSITION_DURATION = 1000;
+
+    private static final float SCALE_SPEED = 0.20f ;
+    private static final float MOVE_SPEED = SCALE_SPEED;
+
+    private int mCurrentRotation;
+    private BitmapTexture mCurrentTexture;
+    private SlideshowAnimation mCurrentAnimation;
+
+    private int mPrevRotation;
+    private BitmapTexture mPrevTexture;
+    private SlideshowAnimation mPrevAnimation;
+
+    private final FloatAnimation mTransitionAnimation =
+            new FloatAnimation(0, 1, TRANSITION_DURATION);
+
+    private Random mRandom = new Random();
+
+    public void next(Bitmap bitmap, int rotation) {
+
+        mTransitionAnimation.start();
+
+        if (mPrevTexture != null) {
+            mPrevTexture.getBitmap().recycle();
+            mPrevTexture.recycle();
+        }
+
+        mPrevTexture = mCurrentTexture;
+        mPrevAnimation = mCurrentAnimation;
+        mPrevRotation = mCurrentRotation;
+
+        mCurrentRotation = rotation;
+        mCurrentTexture = new BitmapTexture(bitmap);
+        if (((rotation / 90) & 0x01) == 0) {
+            mCurrentAnimation = new SlideshowAnimation(
+                    mCurrentTexture.getWidth(), mCurrentTexture.getHeight(),
+                    mRandom);
+        } else {
+            mCurrentAnimation = new SlideshowAnimation(
+                    mCurrentTexture.getHeight(), mCurrentTexture.getWidth(),
+                    mRandom);
+        }
+        mCurrentAnimation.start();
+
+        invalidate();
+    }
+
+    public void release() {
+        if (mPrevTexture != null) {
+            mPrevTexture.recycle();
+            mPrevTexture = null;
+        }
+        if (mCurrentTexture != null) {
+            mCurrentTexture.recycle();
+            mCurrentTexture = null;
+        }
+    }
+
+    @Override
+    protected void render(GLCanvas canvas) {
+        long animTime = AnimationTime.get();
+        boolean requestRender = mTransitionAnimation.calculate(animTime);
+        float alpha = mPrevTexture == null ? 1f : mTransitionAnimation.get();
+
+        if (mPrevTexture != null && alpha != 1f) {
+            requestRender |= mPrevAnimation.calculate(animTime);
+            canvas.save(GLCanvas.SAVE_FLAG_ALPHA | GLCanvas.SAVE_FLAG_MATRIX);
+            canvas.setAlpha(1f - alpha);
+            mPrevAnimation.apply(canvas);
+            canvas.rotate(mPrevRotation, 0, 0, 1);
+            mPrevTexture.draw(canvas, -mPrevTexture.getWidth() / 2,
+                    -mPrevTexture.getHeight() / 2);
+            canvas.restore();
+        }
+        if (mCurrentTexture != null) {
+            requestRender |= mCurrentAnimation.calculate(animTime);
+            canvas.save(GLCanvas.SAVE_FLAG_ALPHA | GLCanvas.SAVE_FLAG_MATRIX);
+            canvas.setAlpha(alpha);
+            mCurrentAnimation.apply(canvas);
+            canvas.rotate(mCurrentRotation, 0, 0, 1);
+            mCurrentTexture.draw(canvas, -mCurrentTexture.getWidth() / 2,
+                    -mCurrentTexture.getHeight() / 2);
+            canvas.restore();
+        }
+        if (requestRender) invalidate();
+    }
+
+    private class SlideshowAnimation extends CanvasAnimation {
+        private final int mWidth;
+        private final int mHeight;
+
+        private final PointF mMovingVector;
+        private float mProgress;
+
+        public SlideshowAnimation(int width, int height, Random random) {
+            mWidth = width;
+            mHeight = height;
+            mMovingVector = new PointF(
+                    MOVE_SPEED * mWidth * (random.nextFloat() - 0.5f),
+                    MOVE_SPEED * mHeight * (random.nextFloat() - 0.5f));
+            setDuration(SLIDESHOW_DURATION);
+        }
+
+        @Override
+        public void apply(GLCanvas canvas) {
+            int viewWidth = getWidth();
+            int viewHeight = getHeight();
+
+            float initScale = Math.min((float)
+                    viewWidth / mWidth, (float) viewHeight / mHeight);
+            float scale = initScale * (1 + SCALE_SPEED * mProgress);
+
+            float centerX = viewWidth / 2 + mMovingVector.x * mProgress;
+            float centerY = viewHeight / 2 + mMovingVector.y * mProgress;
+
+            canvas.translate(centerX, centerY);
+            canvas.scale(scale, scale, 0);
+        }
+
+        @Override
+        public int getCanvasSaveFlags() {
+            return GLCanvas.SAVE_FLAG_MATRIX;
+        }
+
+        @Override
+        protected void onCalculate(float progress) {
+            mProgress = progress;
+        }
+    }
+}