1 /* 2 * Copyright (C) 2010 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.gallery3d.photoeditor; 18 19 import android.content.Context; 20 import android.database.Cursor; 21 import android.graphics.Bitmap; 22 import android.graphics.Bitmap.CompressFormat; 23 import android.graphics.BitmapFactory; 24 import android.graphics.Canvas; 25 import android.graphics.Matrix; 26 import android.graphics.Paint; 27 import android.graphics.Rect; 28 import android.graphics.RectF; 29 import android.net.Uri; 30 import android.provider.MediaStore.Images.ImageColumns; 31 import android.util.Log; 32 33 import java.io.Closeable; 34 import java.io.File; 35 import java.io.FileNotFoundException; 36 import java.io.FileOutputStream; 37 import java.io.IOException; 38 import java.io.InputStream; 39 import java.io.OutputStream; 40 41 /** 42 * Utils for bitmap operations. 43 */ 44 public class BitmapUtils { 45 46 private static final String TAG = "BitmapUtils"; 47 private static final int DEFAULT_COMPRESS_QUALITY = 90; 48 private static final int INDEX_ORIENTATION = 0; 49 50 private static final String[] IMAGE_PROJECTION = new String[] { 51 ImageColumns.ORIENTATION 52 }; 53 54 private final Context context; 55 56 public BitmapUtils(Context context) { 57 this.context = context; 58 } 59 60 /** 61 * Creates a mutable bitmap from subset of source bitmap, transformed by the optional matrix. 62 */ 63 private static Bitmap createBitmap( 64 Bitmap source, int x, int y, int width, int height, Matrix m) { 65 // Re-implement Bitmap createBitmap() to always return a mutable bitmap. 66 Canvas canvas = new Canvas(); 67 68 Bitmap bitmap; 69 Paint paint; 70 if ((m == null) || m.isIdentity()) { 71 bitmap = Bitmap.createBitmap(width, height, source.getConfig()); 72 paint = null; 73 } else { 74 RectF rect = new RectF(0, 0, width, height); 75 m.mapRect(rect); 76 bitmap = Bitmap.createBitmap( 77 Math.round(rect.width()), Math.round(rect.height()), source.getConfig()); 78 79 canvas.translate(-rect.left, -rect.top); 80 canvas.concat(m); 81 82 paint = new Paint(Paint.FILTER_BITMAP_FLAG); 83 if (!m.rectStaysRect()) { 84 paint.setAntiAlias(true); 85 } 86 } 87 bitmap.setDensity(source.getDensity()); 88 canvas.setBitmap(bitmap); 89 90 Rect srcBounds = new Rect(x, y, x + width, y + height); 91 RectF dstBounds = new RectF(0, 0, width, height); 92 canvas.drawBitmap(source, srcBounds, dstBounds, paint); 93 return bitmap; 94 } 95 96 private void closeStream(Closeable stream) { 97 if (stream != null) { 98 try { 99 stream.close(); 100 } catch (IOException e) { 101 e.printStackTrace(); 102 } 103 } 104 } 105 106 private Rect getBitmapBounds(Uri uri) { 107 Rect bounds = new Rect(); 108 InputStream is = null; 109 110 try { 111 is = context.getContentResolver().openInputStream(uri); 112 BitmapFactory.Options options = new BitmapFactory.Options(); 113 options.inJustDecodeBounds = true; 114 BitmapFactory.decodeStream(is, null, options); 115 116 bounds.right = options.outWidth; 117 bounds.bottom = options.outHeight; 118 } catch (FileNotFoundException e) { 119 e.printStackTrace(); 120 } finally { 121 closeStream(is); 122 } 123 124 return bounds; 125 } 126 127 private int getOrientation(Uri uri) { 128 int orientation = 0; 129 Cursor cursor = null; 130 try { 131 cursor = context.getContentResolver().query(uri, IMAGE_PROJECTION, null, null, null); 132 if ((cursor != null) && cursor.moveToNext()) { 133 orientation = cursor.getInt(INDEX_ORIENTATION); 134 } 135 } catch (Exception e) { 136 // Ignore error for no orientation column; just use the default orientation value 0. 137 } finally { 138 if (cursor != null) { 139 cursor.close(); 140 } 141 } 142 return orientation; 143 } 144 145 /** 146 * Decodes bitmap (maybe immutable) that keeps aspect-ratio and spans most within the bounds. 147 */ 148 private Bitmap decodeBitmap(Uri uri, int width, int height) { 149 InputStream is = null; 150 Bitmap bitmap = null; 151 152 try { 153 // TODO: Take max pixels allowed into account for calculation to avoid possible OOM. 154 Rect bounds = getBitmapBounds(uri); 155 int sampleSize = Math.max(bounds.width() / width, bounds.height() / height); 156 sampleSize = Math.min(sampleSize, 157 Math.max(bounds.width() / height, bounds.height() / width)); 158 159 BitmapFactory.Options options = new BitmapFactory.Options(); 160 options.inSampleSize = Math.max(sampleSize, 1); 161 options.inPreferredConfig = Bitmap.Config.ARGB_8888; 162 163 is = context.getContentResolver().openInputStream(uri); 164 bitmap = BitmapFactory.decodeStream(is, null, options); 165 } catch (FileNotFoundException e) { 166 Log.e(TAG, "FileNotFoundException: " + uri); 167 } finally { 168 closeStream(is); 169 } 170 171 // Ensure bitmap in 8888 format, good for editing as well as GL compatible. 172 if ((bitmap != null) && (bitmap.getConfig() != Bitmap.Config.ARGB_8888)) { 173 Bitmap copy = bitmap.copy(Bitmap.Config.ARGB_8888, true); 174 bitmap.recycle(); 175 bitmap = copy; 176 } 177 178 if (bitmap != null) { 179 // Scale down the sampled bitmap if it's still larger than the desired dimension. 180 float scale = Math.min((float) width / bitmap.getWidth(), 181 (float) height / bitmap.getHeight()); 182 scale = Math.max(scale, Math.min((float) height / bitmap.getWidth(), 183 (float) width / bitmap.getHeight())); 184 if (scale < 1) { 185 Matrix m = new Matrix(); 186 m.setScale(scale, scale); 187 Bitmap transformed = createBitmap( 188 bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), m); 189 bitmap.recycle(); 190 return transformed; 191 } 192 } 193 return bitmap; 194 } 195 196 /** 197 * Gets decoded bitmap that keeps orientation as well. 198 */ 199 public Bitmap getBitmap(Uri uri, int width, int height) { 200 Bitmap bitmap = decodeBitmap(uri, width, height); 201 202 // Rotate the decoded bitmap according to its orientation if it's necessary. 203 if (bitmap != null) { 204 int orientation = getOrientation(uri); 205 if (orientation != 0) { 206 Matrix m = new Matrix(); 207 m.setRotate(orientation); 208 Bitmap transformed = createBitmap( 209 bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), m); 210 bitmap.recycle(); 211 return transformed; 212 } 213 } 214 return bitmap; 215 } 216 217 /** 218 * Saves the bitmap by given directory, filename, and format; if the directory is given null, 219 * then saves it under the cache directory. 220 */ 221 public File saveBitmap( 222 Bitmap bitmap, String directory, String filename, CompressFormat format) { 223 224 if (directory == null) { 225 directory = context.getCacheDir().getAbsolutePath(); 226 } else { 227 // Check if the given directory exists or try to create it. 228 File file = new File(directory); 229 if (!file.isDirectory() && !file.mkdirs()) { 230 return null; 231 } 232 } 233 234 File file = null; 235 OutputStream os = null; 236 237 try { 238 filename = (format == CompressFormat.PNG) ? filename + ".png" : filename + ".jpg"; 239 file = new File(directory, filename); 240 os = new FileOutputStream(file); 241 bitmap.compress(format, DEFAULT_COMPRESS_QUALITY, os); 242 } catch (FileNotFoundException e) { 243 e.printStackTrace(); 244 } finally { 245 closeStream(os); 246 } 247 return file; 248 } 249 } 250