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diff --git a/WallpaperPicker/src/com/android/gallery3d/common/BitmapUtils.java b/WallpaperPicker/src/com/android/gallery3d/common/BitmapUtils.java
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+/*
+ * 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.common;
+
+import android.graphics.Bitmap;
+import android.graphics.Bitmap.CompressFormat;
+import android.graphics.BitmapFactory;
+import android.graphics.Canvas;
+import android.graphics.Matrix;
+import android.graphics.Paint;
+import android.os.Build;
+import android.util.FloatMath;
+import android.util.Log;
+
+import java.io.ByteArrayOutputStream;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+public class BitmapUtils {
+ private static final String TAG = "BitmapUtils";
+ private static final int DEFAULT_JPEG_QUALITY = 90;
+ public static final int UNCONSTRAINED = -1;
+
+ private BitmapUtils(){}
+
+ /*
+ * Compute the sample size as a function of minSideLength
+ * and maxNumOfPixels.
+ * minSideLength is used to specify that minimal width or height of a
+ * bitmap.
+ * maxNumOfPixels is used to specify the maximal size in pixels that is
+ * tolerable in terms of memory usage.
+ *
+ * The function returns a sample size based on the constraints.
+ * Both size and minSideLength can be passed in as UNCONSTRAINED,
+ * which indicates no care of the corresponding constraint.
+ * The functions prefers returning a sample size that
+ * generates a smaller bitmap, unless minSideLength = UNCONSTRAINED.
+ *
+ * Also, the function rounds up the sample size to a power of 2 or multiple
+ * of 8 because BitmapFactory only honors sample size this way.
+ * For example, BitmapFactory downsamples an image by 2 even though the
+ * request is 3. So we round up the sample size to avoid OOM.
+ */
+ public static int computeSampleSize(int width, int height,
+ int minSideLength, int maxNumOfPixels) {
+ int initialSize = computeInitialSampleSize(
+ width, height, minSideLength, maxNumOfPixels);
+
+ return initialSize <= 8
+ ? Utils.nextPowerOf2(initialSize)
+ : (initialSize + 7) / 8 * 8;
+ }
+
+ private static int computeInitialSampleSize(int w, int h,
+ int minSideLength, int maxNumOfPixels) {
+ if (maxNumOfPixels == UNCONSTRAINED
+ && minSideLength == UNCONSTRAINED) return 1;
+
+ int lowerBound = (maxNumOfPixels == UNCONSTRAINED) ? 1 :
+ (int) FloatMath.ceil(FloatMath.sqrt((float) (w * h) / maxNumOfPixels));
+
+ if (minSideLength == UNCONSTRAINED) {
+ return lowerBound;
+ } else {
+ int sampleSize = Math.min(w / minSideLength, h / minSideLength);
+ return Math.max(sampleSize, lowerBound);
+ }
+ }
+
+ // This computes a sample size which makes the longer side at least
+ // minSideLength long. If that's not possible, return 1.
+ public static int computeSampleSizeLarger(int w, int h,
+ int minSideLength) {
+ int initialSize = Math.max(w / minSideLength, h / minSideLength);
+ if (initialSize <= 1) return 1;
+
+ return initialSize <= 8
+ ? Utils.prevPowerOf2(initialSize)
+ : initialSize / 8 * 8;
+ }
+
+ // Find the min x that 1 / x >= scale
+ public static int computeSampleSizeLarger(float scale) {
+ int initialSize = (int) FloatMath.floor(1f / scale);
+ if (initialSize <= 1) return 1;
+
+ return initialSize <= 8
+ ? Utils.prevPowerOf2(initialSize)
+ : initialSize / 8 * 8;
+ }
+
+ // Find the max x that 1 / x <= scale.
+ public static int computeSampleSize(float scale) {
+ Utils.assertTrue(scale > 0);
+ int initialSize = Math.max(1, (int) FloatMath.ceil(1 / scale));
+ return initialSize <= 8
+ ? Utils.nextPowerOf2(initialSize)
+ : (initialSize + 7) / 8 * 8;
+ }
+
+ public static Bitmap resizeBitmapByScale(
+ Bitmap bitmap, float scale, boolean recycle) {
+ int width = Math.round(bitmap.getWidth() * scale);
+ int height = Math.round(bitmap.getHeight() * scale);
+ if (width == bitmap.getWidth()
+ && height == bitmap.getHeight()) return bitmap;
+ Bitmap target = Bitmap.createBitmap(width, height, getConfig(bitmap));
+ Canvas canvas = new Canvas(target);
+ canvas.scale(scale, scale);
+ Paint paint = new Paint(Paint.FILTER_BITMAP_FLAG | Paint.DITHER_FLAG);
+ canvas.drawBitmap(bitmap, 0, 0, paint);
+ if (recycle) bitmap.recycle();
+ return target;
+ }
+
+ private static Bitmap.Config getConfig(Bitmap bitmap) {
+ Bitmap.Config config = bitmap.getConfig();
+ if (config == null) {
+ config = Bitmap.Config.ARGB_8888;
+ }
+ return config;
+ }
+
+ public static Bitmap resizeDownBySideLength(
+ Bitmap bitmap, int maxLength, boolean recycle) {
+ int srcWidth = bitmap.getWidth();
+ int srcHeight = bitmap.getHeight();
+ float scale = Math.min(
+ (float) maxLength / srcWidth, (float) maxLength / srcHeight);
+ if (scale >= 1.0f) return bitmap;
+ return resizeBitmapByScale(bitmap, scale, recycle);
+ }
+
+ public static Bitmap resizeAndCropCenter(Bitmap bitmap, int size, boolean recycle) {
+ int w = bitmap.getWidth();
+ int h = bitmap.getHeight();
+ if (w == size && h == size) return bitmap;
+
+ // scale the image so that the shorter side equals to the target;
+ // the longer side will be center-cropped.
+ float scale = (float) size / Math.min(w, h);
+
+ Bitmap target = Bitmap.createBitmap(size, size, getConfig(bitmap));
+ int width = Math.round(scale * bitmap.getWidth());
+ int height = Math.round(scale * bitmap.getHeight());
+ Canvas canvas = new Canvas(target);
+ canvas.translate((size - width) / 2f, (size - height) / 2f);
+ canvas.scale(scale, scale);
+ Paint paint = new Paint(Paint.FILTER_BITMAP_FLAG | Paint.DITHER_FLAG);
+ canvas.drawBitmap(bitmap, 0, 0, paint);
+ if (recycle) bitmap.recycle();
+ return target;
+ }
+
+ public static void recycleSilently(Bitmap bitmap) {
+ if (bitmap == null) return;
+ try {
+ bitmap.recycle();
+ } catch (Throwable t) {
+ Log.w(TAG, "unable recycle bitmap", t);
+ }
+ }
+
+ public static Bitmap rotateBitmap(Bitmap source, int rotation, boolean recycle) {
+ if (rotation == 0) return source;
+ int w = source.getWidth();
+ int h = source.getHeight();
+ Matrix m = new Matrix();
+ m.postRotate(rotation);
+ Bitmap bitmap = Bitmap.createBitmap(source, 0, 0, w, h, m, true);
+ if (recycle) source.recycle();
+ return bitmap;
+ }
+
+ public static Bitmap createVideoThumbnail(String filePath) {
+ // MediaMetadataRetriever is available on API Level 8
+ // but is hidden until API Level 10
+ Class<?> clazz = null;
+ Object instance = null;
+ try {
+ clazz = Class.forName("android.media.MediaMetadataRetriever");
+ instance = clazz.newInstance();
+
+ Method method = clazz.getMethod("setDataSource", String.class);
+ method.invoke(instance, filePath);
+
+ // The method name changes between API Level 9 and 10.
+ if (Build.VERSION.SDK_INT <= 9) {
+ return (Bitmap) clazz.getMethod("captureFrame").invoke(instance);
+ } else {
+ byte[] data = (byte[]) clazz.getMethod("getEmbeddedPicture").invoke(instance);
+ if (data != null) {
+ Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
+ if (bitmap != null) return bitmap;
+ }
+ return (Bitmap) clazz.getMethod("getFrameAtTime").invoke(instance);
+ }
+ } catch (IllegalArgumentException ex) {
+ // Assume this is a corrupt video file
+ } catch (RuntimeException ex) {
+ // Assume this is a corrupt video file.
+ } catch (InstantiationException e) {
+ Log.e(TAG, "createVideoThumbnail", e);
+ } catch (InvocationTargetException e) {
+ Log.e(TAG, "createVideoThumbnail", e);
+ } catch (ClassNotFoundException e) {
+ Log.e(TAG, "createVideoThumbnail", e);
+ } catch (NoSuchMethodException e) {
+ Log.e(TAG, "createVideoThumbnail", e);
+ } catch (IllegalAccessException e) {
+ Log.e(TAG, "createVideoThumbnail", e);
+ } finally {
+ try {
+ if (instance != null) {
+ clazz.getMethod("release").invoke(instance);
+ }
+ } catch (Exception ignored) {
+ }
+ }
+ return null;
+ }
+
+ public static byte[] compressToBytes(Bitmap bitmap) {
+ return compressToBytes(bitmap, DEFAULT_JPEG_QUALITY);
+ }
+
+ public static byte[] compressToBytes(Bitmap bitmap, int quality) {
+ ByteArrayOutputStream baos = new ByteArrayOutputStream(65536);
+ bitmap.compress(CompressFormat.JPEG, quality, baos);
+ return baos.toByteArray();
+ }
+
+ public static boolean isSupportedByRegionDecoder(String mimeType) {
+ if (mimeType == null) return false;
+ mimeType = mimeType.toLowerCase();
+ return mimeType.startsWith("image/") &&
+ (!mimeType.equals("image/gif") && !mimeType.endsWith("bmp"));
+ }
+
+ public static boolean isRotationSupported(String mimeType) {
+ if (mimeType == null) return false;
+ mimeType = mimeType.toLowerCase();
+ return mimeType.equals("image/jpeg");
+ }
+}