1 /* 2 * Copyright (C) 2015 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 17 package com.android.tv.util; 18 19 import android.content.ContentResolver; 20 import android.content.Context; 21 import android.database.sqlite.SQLiteException; 22 import android.graphics.Bitmap; 23 import android.graphics.BitmapFactory; 24 import android.graphics.PorterDuff; 25 import android.graphics.Rect; 26 import android.graphics.drawable.Drawable; 27 import android.net.Uri; 28 import android.support.annotation.NonNull; 29 import android.text.TextUtils; 30 import android.util.Log; 31 32 import java.io.BufferedInputStream; 33 import java.io.Closeable; 34 import java.io.IOException; 35 import java.io.InputStream; 36 import java.net.URL; 37 import java.net.URLConnection; 38 39 public final class BitmapUtils { 40 private static final String TAG = "BitmapUtils"; 41 private static final boolean DEBUG = false; 42 43 // The value of 64K, for MARK_READ_LIMIT, is chosen to be eight times the default buffer size 44 // of BufferedInputStream (8K) allowing it to double its buffers three times. Also it is a 45 // fairly reasonable value, not using too much memory and being large enough for most cases. 46 private static final int MARK_READ_LIMIT = 64 * 1024; // 64K 47 48 private static final int CONNECTION_TIMEOUT_MS_FOR_URLCONNECTION = 3000; // 3 sec 49 private static final int READ_TIMEOUT_MS_FOR_URLCONNECTION = 10000; // 10 sec 50 51 private BitmapUtils() { /* cannot be instantiated */ } 52 53 public static Bitmap scaleBitmap(Bitmap bm, int maxWidth, int maxHeight) { 54 Rect rect = calculateNewSize(bm, maxWidth, maxHeight); 55 return Bitmap.createScaledBitmap(bm, rect.right, rect.bottom, false); 56 } 57 58 private static Rect calculateNewSize(Bitmap bm, int maxWidth, int maxHeight) { 59 final double ratio = maxHeight / (double) maxWidth; 60 final double bmRatio = bm.getHeight() / (double) bm.getWidth(); 61 Rect rect = new Rect(); 62 if (ratio > bmRatio) { 63 rect.right = maxWidth; 64 rect.bottom = Math.round((float) bm.getHeight() * maxWidth / bm.getWidth()); 65 } else { 66 rect.right = Math.round((float) bm.getWidth() * maxHeight / bm.getHeight()); 67 rect.bottom = maxHeight; 68 } 69 return rect; 70 } 71 72 public static ScaledBitmapInfo createScaledBitmapInfo(String id, Bitmap bm, int maxWidth, 73 int maxHeight) { 74 return new ScaledBitmapInfo(id, scaleBitmap(bm, maxWidth, maxHeight), 75 calculateInSampleSize(bm.getWidth(), bm.getHeight(), maxWidth, maxHeight)); 76 } 77 78 /** 79 * Decode large sized bitmap into requested size. 80 */ 81 public static ScaledBitmapInfo decodeSampledBitmapFromUriString(Context context, 82 String uriString, int reqWidth, int reqHeight) { 83 if (TextUtils.isEmpty(uriString)) { 84 return null; 85 } 86 87 InputStream inputStream = null; 88 try { 89 inputStream = new BufferedInputStream(getInputStream(context, uriString)); 90 inputStream.mark(MARK_READ_LIMIT); 91 92 // Check the bitmap dimensions. 93 BitmapFactory.Options options = new BitmapFactory.Options(); 94 options.inJustDecodeBounds = true; 95 BitmapFactory.decodeStream(inputStream, null, options); 96 97 // Rewind the stream in order to restart bitmap decoding. 98 try { 99 inputStream.reset(); 100 } catch (IOException e) { 101 if (DEBUG) { 102 Log.i(TAG, "Failed to rewind stream: " + uriString, e); 103 } 104 105 // Failed to rewind the stream, try to reopen it. 106 close(inputStream); 107 inputStream = getInputStream(context, uriString); 108 } 109 110 // Decode the bitmap possibly resizing it. 111 options.inJustDecodeBounds = false; 112 options.inPreferredConfig = Bitmap.Config.RGB_565; 113 options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); 114 Bitmap bitmap = BitmapFactory.decodeStream(inputStream, null, options); 115 if (bitmap == null) { 116 return null; 117 } 118 return new ScaledBitmapInfo(uriString, bitmap, options.inSampleSize); 119 } catch (IOException e) { 120 if (DEBUG) { 121 // It can happens in normal cases like when a channel doesn't have any logo. 122 Log.w(TAG, "Failed to open stream: " + uriString, e); 123 } 124 return null; 125 } catch (SQLiteException e) { 126 Log.e(TAG, "Failed to open stream: " + uriString, e); 127 return null; 128 } finally { 129 close(inputStream); 130 } 131 } 132 133 private static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, 134 int reqHeight) { 135 return calculateInSampleSize(options.outWidth, options.outHeight, reqWidth, reqHeight); 136 } 137 138 private static int calculateInSampleSize(int width, int height, int reqWidth, int reqHeight) { 139 // Calculates the largest inSampleSize that, is a power of two and, keeps either width or 140 // height larger or equal to the requested width and height. 141 int ratio = Math.max(width / reqWidth, height / reqHeight); 142 return Math.max(1, Integer.highestOneBit(ratio)); 143 } 144 145 private static InputStream getInputStream(Context context, String uriString) 146 throws IOException { 147 Uri uri = Uri.parse(uriString).normalizeScheme(); 148 if (isContentResolverUri(uri)) { 149 return context.getContentResolver().openInputStream(uri); 150 } else { 151 // TODO We should disconnect() the URLConnection in order to allow connection reuse. 152 URLConnection urlConnection = new URL(uriString).openConnection(); 153 urlConnection.setConnectTimeout(CONNECTION_TIMEOUT_MS_FOR_URLCONNECTION); 154 urlConnection.setReadTimeout(READ_TIMEOUT_MS_FOR_URLCONNECTION); 155 return urlConnection.getInputStream(); 156 } 157 } 158 159 private static boolean isContentResolverUri(Uri uri) { 160 String scheme = uri.getScheme(); 161 return ContentResolver.SCHEME_CONTENT.equals(scheme) 162 || ContentResolver.SCHEME_ANDROID_RESOURCE.equals(scheme) 163 || ContentResolver.SCHEME_FILE.equals(scheme); 164 } 165 166 private static void close(Closeable closeable) { 167 if (closeable != null) { 168 try { 169 closeable.close(); 170 } catch (IOException e) { 171 // Log and continue. 172 Log.w(TAG,"Error closing " + closeable, e); 173 } 174 } 175 } 176 177 /** 178 * A wrapper class which contains the loaded bitmap and the scaling information. 179 */ 180 public static class ScaledBitmapInfo { 181 /** 182 * The id of bitmap, usually this is the URI of the original. 183 */ 184 @NonNull 185 public final String id; 186 187 /** 188 * The loaded bitmap object. 189 */ 190 @NonNull 191 public final Bitmap bitmap; 192 193 /** 194 * The scaling factor to the original bitmap. It should be an positive integer. 195 * 196 * @see android.graphics.BitmapFactory.Options#inSampleSize 197 */ 198 public final int inSampleSize; 199 200 /** 201 * A constructor. 202 * 203 * @param bitmap The loaded bitmap object. 204 * @param inSampleSize The sampling size. 205 * See {@link android.graphics.BitmapFactory.Options#inSampleSize} 206 */ 207 public ScaledBitmapInfo(@NonNull String id, @NonNull Bitmap bitmap, int inSampleSize) { 208 this.id = id; 209 this.bitmap = bitmap; 210 this.inSampleSize = inSampleSize; 211 } 212 213 /** 214 * Checks if the bitmap needs to be reloaded. The scaling is performed by power 2. 215 * The bitmap can be reloaded only if the required width or height is greater then or equal 216 * to the existing bitmap. 217 * If the full sized bitmap is already loaded, returns {@code false}. 218 * 219 * @see android.graphics.BitmapFactory.Options#inSampleSize 220 */ 221 public boolean needToReload(int reqWidth, int reqHeight) { 222 if (inSampleSize <= 1) { 223 if (DEBUG) Log.d(TAG, "Reload not required " + this + " already full size."); 224 return false; 225 } 226 Rect size = calculateNewSize(this.bitmap, reqWidth, reqHeight); 227 boolean reload = (size.right >= bitmap.getWidth() * 2 228 || size.bottom >= bitmap.getHeight() * 2); 229 if (DEBUG) { 230 Log.d(TAG, "needToReload(" + reqWidth + ", " + reqHeight + ")=" + reload 231 + " because the new size would be " + size + " for " + this); 232 } 233 return reload; 234 } 235 236 /** 237 * Returns {@code true} if a request the size of {@code other} would need a reload. 238 */ 239 public boolean needToReload(ScaledBitmapInfo other){ 240 return needToReload(other.bitmap.getWidth(), other.bitmap.getHeight()); 241 } 242 243 @Override 244 public String toString() { 245 return "ScaledBitmapInfo[" + id + "](in=" + inSampleSize + ", w=" + bitmap.getWidth() 246 + ", h=" + bitmap.getHeight() + ")"; 247 } 248 } 249 250 /** 251 * Applies a color filter to the {@code drawable}. The color filter is made with the given 252 * {@code color} and {@link android.graphics.PorterDuff.Mode#SRC_ATOP}. 253 * 254 * @see Drawable#setColorFilter 255 */ 256 public static void setColorFilterToDrawable(int color, Drawable drawable) { 257 if (drawable != null) { 258 drawable.mutate().setColorFilter(color, PorterDuff.Mode.SRC_ATOP); 259 } 260 } 261 } 262
