1 files changed, 257 insertions, 0 deletions
diff --git a/src/com/android/photos/BitmapRegionTileSource.java b/src/com/android/photos/BitmapRegionTileSource.java
new file mode 100644
index 000000000..964748523
--- /dev/null
+++ b/src/com/android/photos/BitmapRegionTileSource.java
@@ -0,0 +1,257 @@
+/*
+ * Copyright (C) 2013 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.photos;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Bitmap.Config;
+import android.graphics.BitmapFactory;
+import android.graphics.BitmapRegionDecoder;
+import android.graphics.Canvas;
+import android.graphics.Rect;
+import android.net.Uri;
+import android.os.Build;
+import android.os.Build.VERSION_CODES;
+import android.util.Log;
+
+import com.android.gallery3d.common.BitmapUtils;
+import com.android.gallery3d.glrenderer.BasicTexture;
+import com.android.gallery3d.glrenderer.BitmapTexture;
+import com.android.photos.views.TiledImageRenderer;
+
+import java.io.BufferedInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * A {@link com.android.photos.views.TiledImageRenderer.TileSource} using
+ * {@link BitmapRegionDecoder} to wrap a local file
+ */
+@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1)
+public class BitmapRegionTileSource implements TiledImageRenderer.TileSource {
+
+    private static final String TAG = "BitmapRegionTileSource";
+
+    private static final boolean REUSE_BITMAP =
+            Build.VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN;
+    private static final int GL_SIZE_LIMIT = 2048;
+    // This must be no larger than half the size of the GL_SIZE_LIMIT
+    // due to decodePreview being allowed to be up to 2x the size of the target
+    private static final int MAX_PREVIEW_SIZE = 1024;
+
+    BitmapRegionDecoder mDecoder;
+    int mWidth;
+    int mHeight;
+    int mTileSize;
+    private BasicTexture mPreview;
+    private final int mRotation;
+
+    // For use only by getTile
+    private Rect mWantRegion = new Rect();
+    private Rect mOverlapRegion = new Rect();
+    private BitmapFactory.Options mOptions;
+    private Canvas mCanvas;
+
+    public BitmapRegionTileSource(Context context, String path, int previewSize, int rotation) {
+        this(context, path, null, 0, previewSize, rotation);
+    }
+
+    public BitmapRegionTileSource(Context context, Uri uri, int previewSize, int rotation) {
+        this(context, null, uri, 0, previewSize, rotation);
+    }
+
+    public BitmapRegionTileSource(Context context, int resId, int previewSize, int rotation) {
+        this(context, null, null, resId, previewSize, rotation);
+    }
+
+    private BitmapRegionTileSource(
+            Context context, String path, Uri uri, int resId, int previewSize, int rotation) {
+        mTileSize = TiledImageRenderer.suggestedTileSize(context);
+        mRotation = rotation;
+        try {
+            if (path != null) {
+                mDecoder = BitmapRegionDecoder.newInstance(path, true);
+            } else if (uri != null) {
+                InputStream is = context.getContentResolver().openInputStream(uri);
+                BufferedInputStream bis = new BufferedInputStream(is);
+                mDecoder = BitmapRegionDecoder.newInstance(bis, true);
+            } else {
+                InputStream is = context.getResources().openRawResource(resId);
+                BufferedInputStream bis = new BufferedInputStream(is);
+                mDecoder = BitmapRegionDecoder.newInstance(bis, true);
+            }
+            mWidth = mDecoder.getWidth();
+            mHeight = mDecoder.getHeight();
+        } catch (IOException e) {
+            Log.w("BitmapRegionTileSource", "ctor failed", e);
+        }
+        mOptions = new BitmapFactory.Options();
+        mOptions.inPreferredConfig = Bitmap.Config.ARGB_8888;
+        mOptions.inPreferQualityOverSpeed = true;
+        mOptions.inTempStorage = new byte[16 * 1024];
+        if (previewSize != 0) {
+            previewSize = Math.min(previewSize, MAX_PREVIEW_SIZE);
+            // Although this is the same size as the Bitmap that is likely already
+            // loaded, the lifecycle is different and interactions are on a different
+            // thread. Thus to simplify, this source will decode its own bitmap.
+            Bitmap preview = decodePreview(context, path, uri, resId, previewSize);
+            if (preview.getWidth() <= GL_SIZE_LIMIT && preview.getHeight() <= GL_SIZE_LIMIT) {
+                mPreview = new BitmapTexture(preview);
+            } else {
+                Log.w(TAG, String.format(
+                        "Failed to create preview of apropriate size! "
+                        + " in: %dx%d, out: %dx%d",
+                        mWidth, mHeight,
+                        preview.getWidth(), preview.getHeight()));
+            }
+        }
+    }
+
+    @Override
+    public int getTileSize() {
+        return mTileSize;
+    }
+
+    @Override
+    public int getImageWidth() {
+        return mWidth;
+    }
+
+    @Override
+    public int getImageHeight() {
+        return mHeight;
+    }
+
+    @Override
+    public BasicTexture getPreview() {
+        return mPreview;
+    }
+
+    @Override
+    public int getRotation() {
+        return mRotation;
+    }
+
+    @Override
+    public Bitmap getTile(int level, int x, int y, Bitmap bitmap) {
+        int tileSize = getTileSize();
+        if (!REUSE_BITMAP) {
+            return getTileWithoutReusingBitmap(level, x, y, tileSize);
+        }
+
+        int t = tileSize << level;
+        mWantRegion.set(x, y, x + t, y + t);
+
+        if (bitmap == null) {
+            bitmap = Bitmap.createBitmap(tileSize, tileSize, Bitmap.Config.ARGB_8888);
+        }
+
+        mOptions.inSampleSize = (1 << level);
+        mOptions.inBitmap = bitmap;
+
+        try {
+            bitmap = mDecoder.decodeRegion(mWantRegion, mOptions);
+        } finally {
+            if (mOptions.inBitmap != bitmap && mOptions.inBitmap != null) {
+                mOptions.inBitmap = null;
+            }
+        }
+
+        if (bitmap == null) {
+            Log.w("BitmapRegionTileSource", "fail in decoding region");
+        }
+        return bitmap;
+    }
+
+    private Bitmap getTileWithoutReusingBitmap(
+            int level, int x, int y, int tileSize) {
+
+        int t = tileSize << level;
+        mWantRegion.set(x, y, x + t, y + t);
+
+        mOverlapRegion.set(0, 0, mWidth, mHeight);
+
+        mOptions.inSampleSize = (1 << level);
+        Bitmap bitmap = mDecoder.decodeRegion(mOverlapRegion, mOptions);
+
+        if (bitmap == null) {
+            Log.w(TAG, "fail in decoding region");
+        }
+
+        if (mWantRegion.equals(mOverlapRegion)) {
+            return bitmap;
+        }
+
+        Bitmap result = Bitmap.createBitmap(tileSize, tileSize, Config.ARGB_8888);
+        if (mCanvas == null) {
+            mCanvas = new Canvas();
+        }
+        mCanvas.setBitmap(result);
+        mCanvas.drawBitmap(bitmap,
+                (mOverlapRegion.left - mWantRegion.left) >> level,
+                (mOverlapRegion.top - mWantRegion.top) >> level, null);
+        mCanvas.setBitmap(null);
+        return result;
+    }
+
+    /**
+     * Note that the returned bitmap may have a long edge that's longer
+     * than the targetSize, but it will always be less than 2x the targetSize
+     */
+    private Bitmap decodePreview(Context context, String file, Uri uri, int resId, int targetSize) {
+        float scale = (float) targetSize / Math.max(mWidth, mHeight);
+        mOptions.inSampleSize = BitmapUtils.computeSampleSizeLarger(scale);
+        mOptions.inJustDecodeBounds = false;
+
+        Bitmap result = null;
+        if (file != null) {
+            result = BitmapFactory.decodeFile(file, mOptions);
+        } else if (uri != null) {
+            try {
+                InputStream is = context.getContentResolver().openInputStream(uri);
+                BufferedInputStream bis = new BufferedInputStream(is);
+                result = BitmapFactory.decodeStream(bis, null, mOptions);
+            } catch (IOException e) {
+                Log.w("BitmapRegionTileSource", "getting preview failed", e);
+            }
+        } else {
+            result = BitmapFactory.decodeResource(context.getResources(), resId, mOptions);
+        }
+        if (result == null) {
+            return null;
+        }
+
+        // We need to resize down if the decoder does not support inSampleSize
+        // or didn't support the specified inSampleSize (some decoders only do powers of 2)
+        scale = (float) targetSize / (float) (Math.max(result.getWidth(), result.getHeight()));
+
+        if (scale <= 0.5) {
+            result = BitmapUtils.resizeBitmapByScale(result, scale, true);
+        }
+        return ensureGLCompatibleBitmap(result);
+    }
+
+    private static Bitmap ensureGLCompatibleBitmap(Bitmap bitmap) {
+        if (bitmap == null || bitmap.getConfig() != null) {
+            return bitmap;
+        }
+        Bitmap newBitmap = bitmap.copy(Config.ARGB_8888, false);
+        bitmap.recycle();
+        return newBitmap;
+    }
+}