Util.java revision 2b2cbfb78e3e184b55041926c7bc7bdc18cb5934
1/* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.android.camera; 18 19import android.app.Activity; 20import android.app.AlertDialog; 21import android.content.DialogInterface; 22import android.graphics.Bitmap; 23import android.graphics.BitmapFactory; 24import android.graphics.Matrix; 25import android.hardware.Camera.Size; 26import android.util.Log; 27import android.view.Display; 28import android.view.Surface; 29import android.view.View; 30import android.view.animation.Animation; 31import android.view.animation.TranslateAnimation; 32 33import com.android.camera.gallery.IImage; 34import com.android.camera.R; 35 36import java.util.List; 37import java.io.Closeable; 38 39/** 40 * Collection of utility functions used in this package. 41 */ 42public class Util { 43 private static final String TAG = "Util"; 44 public static final int DIRECTION_LEFT = 0; 45 public static final int DIRECTION_RIGHT = 1; 46 public static final int DIRECTION_UP = 2; 47 public static final int DIRECTION_DOWN = 3; 48 49 public static final String REVIEW_ACTION = "com.cooliris.media.action.REVIEW"; 50 51 private Util() { 52 } 53 54 // Rotates the bitmap by the specified degree. 55 // If a new bitmap is created, the original bitmap is recycled. 56 public static Bitmap rotate(Bitmap b, int degrees) { 57 if (degrees != 0 && b != null) { 58 Matrix m = new Matrix(); 59 m.setRotate(degrees, 60 (float) b.getWidth() / 2, (float) b.getHeight() / 2); 61 try { 62 Bitmap b2 = Bitmap.createBitmap( 63 b, 0, 0, b.getWidth(), b.getHeight(), m, true); 64 if (b != b2) { 65 b.recycle(); 66 b = b2; 67 } 68 } catch (OutOfMemoryError ex) { 69 // We have no memory to rotate. Return the original bitmap. 70 } 71 } 72 return b; 73 } 74 75 /* 76 * Compute the sample size as a function of minSideLength 77 * and maxNumOfPixels. 78 * minSideLength is used to specify that minimal width or height of a 79 * bitmap. 80 * maxNumOfPixels is used to specify the maximal size in pixels that is 81 * tolerable in terms of memory usage. 82 * 83 * The function returns a sample size based on the constraints. 84 * Both size and minSideLength can be passed in as IImage.UNCONSTRAINED, 85 * which indicates no care of the corresponding constraint. 86 * The functions prefers returning a sample size that 87 * generates a smaller bitmap, unless minSideLength = IImage.UNCONSTRAINED. 88 * 89 * Also, the function rounds up the sample size to a power of 2 or multiple 90 * of 8 because BitmapFactory only honors sample size this way. 91 * For example, BitmapFactory downsamples an image by 2 even though the 92 * request is 3. So we round up the sample size to avoid OOM. 93 */ 94 public static int computeSampleSize(BitmapFactory.Options options, 95 int minSideLength, int maxNumOfPixels) { 96 int initialSize = computeInitialSampleSize(options, minSideLength, 97 maxNumOfPixels); 98 99 int roundedSize; 100 if (initialSize <= 8) { 101 roundedSize = 1; 102 while (roundedSize < initialSize) { 103 roundedSize <<= 1; 104 } 105 } else { 106 roundedSize = (initialSize + 7) / 8 * 8; 107 } 108 109 return roundedSize; 110 } 111 112 private static int computeInitialSampleSize(BitmapFactory.Options options, 113 int minSideLength, int maxNumOfPixels) { 114 double w = options.outWidth; 115 double h = options.outHeight; 116 117 int lowerBound = (maxNumOfPixels == IImage.UNCONSTRAINED) ? 1 : 118 (int) Math.ceil(Math.sqrt(w * h / maxNumOfPixels)); 119 int upperBound = (minSideLength == IImage.UNCONSTRAINED) ? 128 : 120 (int) Math.min(Math.floor(w / minSideLength), 121 Math.floor(h / minSideLength)); 122 123 if (upperBound < lowerBound) { 124 // return the larger one when there is no overlapping zone. 125 return lowerBound; 126 } 127 128 if ((maxNumOfPixels == IImage.UNCONSTRAINED) && 129 (minSideLength == IImage.UNCONSTRAINED)) { 130 return 1; 131 } else if (minSideLength == IImage.UNCONSTRAINED) { 132 return lowerBound; 133 } else { 134 return upperBound; 135 } 136 } 137 138 public static <T> int indexOf(T [] array, T s) { 139 for (int i = 0; i < array.length; i++) { 140 if (array[i].equals(s)) { 141 return i; 142 } 143 } 144 return -1; 145 } 146 147 public static void closeSilently(Closeable c) { 148 if (c == null) return; 149 try { 150 c.close(); 151 } catch (Throwable t) { 152 // do nothing 153 } 154 } 155 156 public static Bitmap makeBitmap(byte[] jpegData, int maxNumOfPixels) { 157 try { 158 BitmapFactory.Options options = new BitmapFactory.Options(); 159 options.inJustDecodeBounds = true; 160 BitmapFactory.decodeByteArray(jpegData, 0, jpegData.length, 161 options); 162 if (options.mCancel || options.outWidth == -1 163 || options.outHeight == -1) { 164 return null; 165 } 166 options.inSampleSize = computeSampleSize( 167 options, IImage.UNCONSTRAINED, maxNumOfPixels); 168 options.inJustDecodeBounds = false; 169 170 options.inDither = false; 171 options.inPreferredConfig = Bitmap.Config.ARGB_8888; 172 return BitmapFactory.decodeByteArray(jpegData, 0, jpegData.length, 173 options); 174 } catch (OutOfMemoryError ex) { 175 Log.e(TAG, "Got oom exception ", ex); 176 return null; 177 } 178 } 179 180 public static void Assert(boolean cond) { 181 if (!cond) { 182 throw new AssertionError(); 183 } 184 } 185 186 public static void showFatalErrorAndFinish( 187 final Activity activity, String title, String message) { 188 DialogInterface.OnClickListener buttonListener = 189 new DialogInterface.OnClickListener() { 190 public void onClick(DialogInterface dialog, int which) { 191 activity.finish(); 192 } 193 }; 194 new AlertDialog.Builder(activity) 195 .setCancelable(false) 196 .setIcon(android.R.drawable.ic_dialog_alert) 197 .setTitle(title) 198 .setMessage(message) 199 .setNeutralButton(R.string.details_ok, buttonListener) 200 .show(); 201 } 202 203 public static Animation slideOut(View view, int to) { 204 view.setVisibility(View.INVISIBLE); 205 Animation anim; 206 switch (to) { 207 case DIRECTION_LEFT: 208 anim = new TranslateAnimation(0, -view.getWidth(), 0, 0); 209 break; 210 case DIRECTION_RIGHT: 211 anim = new TranslateAnimation(0, view.getWidth(), 0, 0); 212 break; 213 case DIRECTION_UP: 214 anim = new TranslateAnimation(0, 0, 0, -view.getHeight()); 215 break; 216 case DIRECTION_DOWN: 217 anim = new TranslateAnimation(0, 0, 0, view.getHeight()); 218 break; 219 default: 220 throw new IllegalArgumentException(Integer.toString(to)); 221 } 222 anim.setDuration(500); 223 view.startAnimation(anim); 224 return anim; 225 } 226 227 public static Animation slideIn(View view, int from) { 228 view.setVisibility(View.VISIBLE); 229 Animation anim; 230 switch (from) { 231 case DIRECTION_LEFT: 232 anim = new TranslateAnimation(-view.getWidth(), 0, 0, 0); 233 break; 234 case DIRECTION_RIGHT: 235 anim = new TranslateAnimation(view.getWidth(), 0, 0, 0); 236 break; 237 case DIRECTION_UP: 238 anim = new TranslateAnimation(0, 0, -view.getHeight(), 0); 239 break; 240 case DIRECTION_DOWN: 241 anim = new TranslateAnimation(0, 0, view.getHeight(), 0); 242 break; 243 default: 244 throw new IllegalArgumentException(Integer.toString(from)); 245 } 246 anim.setDuration(500); 247 view.startAnimation(anim); 248 return anim; 249 } 250 251 public static <T> T checkNotNull(T object) { 252 if (object == null) throw new NullPointerException(); 253 return object; 254 } 255 256 public static boolean equals(Object a, Object b) { 257 return (a == b) || (a == null ? false : a.equals(b)); 258 } 259 260 public static boolean isPowerOf2(int n) { 261 return (n & -n) == n; 262 } 263 264 public static int nextPowerOf2(int n) { 265 n -= 1; 266 n |= n >>> 16; 267 n |= n >>> 8; 268 n |= n >>> 4; 269 n |= n >>> 2; 270 n |= n >>> 1; 271 return n + 1; 272 } 273 274 public static float distance(float x, float y, float sx, float sy) { 275 float dx = x - sx; 276 float dy = y - sy; 277 return (float) Math.sqrt(dx * dx + dy * dy); 278 } 279 280 public static int clamp(int x, int min, int max) { 281 if (x > max) return max; 282 if (x < min) return min; 283 return x; 284 } 285 286 public static int getDisplayRotation(Activity activity) { 287 int rotation = activity.getWindowManager().getDefaultDisplay() 288 .getRotation(); 289 switch (rotation) { 290 case Surface.ROTATION_0: return 0; 291 case Surface.ROTATION_90: return 90; 292 case Surface.ROTATION_180: return 180; 293 case Surface.ROTATION_270: return 270; 294 } 295 return 0; 296 } 297 298 public static void setCameraDisplayOrientation(Activity activity, 299 int cameraId, android.hardware.Camera camera) { 300 android.hardware.Camera.CameraInfo info = 301 new android.hardware.Camera.CameraInfo(); 302 android.hardware.Camera.getCameraInfo(cameraId, info); 303 int degrees = getDisplayRotation(activity); 304 int result = (info.orientation - degrees + 360) % 360; 305 camera.setDisplayOrientation(result); 306 } 307 308 public static Size getOptimalPreviewSize(Activity currentActivity, 309 List<Size> sizes, double targetRatio) { 310 final double ASPECT_TOLERANCE = 0.05; 311 if (sizes == null) return null; 312 313 Size optimalSize = null; 314 double minDiff = Double.MAX_VALUE; 315 316 // Because of bugs of overlay and layout, we sometimes will try to 317 // layout the viewfinder in the portrait orientation and thus get the 318 // wrong size of mSurfaceView. When we change the preview size, the 319 // new overlay will be created before the old one closed, which causes 320 // an exception. For now, just get the screen size 321 322 Display display = currentActivity.getWindowManager().getDefaultDisplay(); 323 int targetHeight = Math.min(display.getHeight(), display.getWidth()); 324 325 if (targetHeight <= 0) { 326 // We don't know the size of SurfaceView, use screen height 327 targetHeight = display.getHeight(); 328 } 329 330 // Try to find an size match aspect ratio and size 331 for (Size size : sizes) { 332 double ratio = (double) size.width / size.height; 333 if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue; 334 if (Math.abs(size.height - targetHeight) < minDiff) { 335 optimalSize = size; 336 minDiff = Math.abs(size.height - targetHeight); 337 } 338 } 339 340 // Cannot find the one match the aspect ratio, ignore the requirement 341 if (optimalSize == null) { 342 Log.v(TAG, "No preview size match the aspect ratio"); 343 minDiff = Double.MAX_VALUE; 344 for (Size size : sizes) { 345 if (Math.abs(size.height - targetHeight) < minDiff) { 346 optimalSize = size; 347 minDiff = Math.abs(size.height - targetHeight); 348 } 349 } 350 } 351 return optimalSize; 352 } 353} 354