| /* |
| * Copyright (C) 2012 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.camera.util; |
| |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.content.res.Resources; |
| import android.database.Cursor; |
| import android.database.sqlite.SQLiteException; |
| import android.graphics.Bitmap; |
| import android.graphics.BitmapFactory; |
| import android.graphics.Matrix; |
| import android.graphics.Rect; |
| import android.net.Uri; |
| import android.provider.MediaStore; |
| import android.webkit.MimeTypeMap; |
| |
| import com.android.camera.debug.Log; |
| import com.android.camera.exif.ExifInterface; |
| import com.android.camera.exif.ExifTag; |
| |
| import java.io.Closeable; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.List; |
| |
| public final class ImageLoader { |
| |
| private static final Log.Tag TAG = new Log.Tag("ImageLoader"); |
| |
| public static final String JPEG_MIME_TYPE = "image/jpeg"; |
| public static final int DEFAULT_COMPRESS_QUALITY = 95; |
| |
| public static final int ORI_NORMAL = ExifInterface.Orientation.TOP_LEFT; |
| public static final int ORI_ROTATE_90 = ExifInterface.Orientation.RIGHT_TOP; |
| public static final int ORI_ROTATE_180 = ExifInterface.Orientation.BOTTOM_LEFT; |
| public static final int ORI_ROTATE_270 = ExifInterface.Orientation.RIGHT_BOTTOM; |
| public static final int ORI_FLIP_HOR = ExifInterface.Orientation.TOP_RIGHT; |
| public static final int ORI_FLIP_VERT = ExifInterface.Orientation.BOTTOM_RIGHT; |
| public static final int ORI_TRANSPOSE = ExifInterface.Orientation.LEFT_TOP; |
| public static final int ORI_TRANSVERSE = ExifInterface.Orientation.LEFT_BOTTOM; |
| |
| private static final int BITMAP_LOAD_BACKOUT_ATTEMPTS = 5; |
| private ImageLoader() {} |
| |
| /** |
| * Returns the Mime type for a Url. Safe to use with Urls that do not |
| * come from Gallery's content provider. |
| */ |
| public static String getMimeType(Uri src) { |
| String postfix = MimeTypeMap.getFileExtensionFromUrl(src.toString()); |
| String ret = null; |
| if (postfix != null) { |
| ret = MimeTypeMap.getSingleton().getMimeTypeFromExtension(postfix); |
| } |
| return ret; |
| } |
| |
| public static String getLocalPathFromUri(ContentResolver resolver, Uri uri) { |
| Cursor cursor = resolver.query(uri, |
| new String[]{MediaStore.Images.Media.DATA}, null, null, null); |
| if (cursor == null) { |
| return null; |
| } |
| int index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); |
| cursor.moveToFirst(); |
| return cursor.getString(index); |
| } |
| |
| /** |
| * Returns the image's orientation flag. Defaults to ORI_NORMAL if no valid |
| * orientation was found. |
| */ |
| public static int getMetadataOrientation(Context context, Uri uri) { |
| if (uri == null || context == null) { |
| throw new IllegalArgumentException("bad argument to getOrientation"); |
| } |
| |
| // First try to find orientation data in Gallery's ContentProvider. |
| Cursor cursor = null; |
| try { |
| cursor = context.getContentResolver().query(uri, |
| new String[] { MediaStore.Images.ImageColumns.ORIENTATION }, |
| null, null, null); |
| if (cursor != null && cursor.moveToNext()) { |
| int ori = cursor.getInt(0); |
| switch (ori) { |
| case 90: |
| return ORI_ROTATE_90; |
| case 270: |
| return ORI_ROTATE_270; |
| case 180: |
| return ORI_ROTATE_180; |
| default: |
| return ORI_NORMAL; |
| } |
| } |
| } catch (SQLiteException e) { |
| // Do nothing |
| } catch (IllegalArgumentException e) { |
| // Do nothing |
| } catch (IllegalStateException e) { |
| // Do nothing |
| } finally { |
| closeSilently(cursor); |
| } |
| |
| // Fall back to checking EXIF tags in file. |
| if (ContentResolver.SCHEME_FILE.equals(uri.getScheme())) { |
| String mimeType = getMimeType(uri); |
| if (!JPEG_MIME_TYPE.equals(mimeType)) { |
| return ORI_NORMAL; |
| } |
| String path = uri.getPath(); |
| ExifInterface exif = new ExifInterface(); |
| try { |
| exif.readExif(path); |
| Integer tagval = exif.getTagIntValue(ExifInterface.TAG_ORIENTATION); |
| if (tagval != null) { |
| int orientation = tagval; |
| switch(orientation) { |
| case ORI_NORMAL: |
| case ORI_ROTATE_90: |
| case ORI_ROTATE_180: |
| case ORI_ROTATE_270: |
| case ORI_FLIP_HOR: |
| case ORI_FLIP_VERT: |
| case ORI_TRANSPOSE: |
| case ORI_TRANSVERSE: |
| return orientation; |
| default: |
| return ORI_NORMAL; |
| } |
| } |
| } catch (IOException e) { |
| Log.w(TAG, "Failed to read EXIF orientation", e); |
| } |
| } |
| return ORI_NORMAL; |
| } |
| |
| /** |
| * Returns the rotation of image at the given URI as one of 0, 90, 180, |
| * 270. Defaults to 0. |
| */ |
| public static int getMetadataRotation(Context context, Uri uri) { |
| int orientation = getMetadataOrientation(context, uri); |
| switch(orientation) { |
| case ORI_ROTATE_90: |
| return 90; |
| case ORI_ROTATE_180: |
| return 180; |
| case ORI_ROTATE_270: |
| return 270; |
| default: |
| return 0; |
| } |
| } |
| |
| /** |
| * Takes an orientation and a bitmap, and returns the bitmap transformed |
| * to that orientation. |
| */ |
| public static Bitmap orientBitmap(Bitmap bitmap, int ori) { |
| Matrix matrix = new Matrix(); |
| int w = bitmap.getWidth(); |
| int h = bitmap.getHeight(); |
| if (ori == ORI_ROTATE_90 || |
| ori == ORI_ROTATE_270 || |
| ori == ORI_TRANSPOSE || |
| ori == ORI_TRANSVERSE) { |
| int tmp = w; |
| w = h; |
| h = tmp; |
| } |
| switch (ori) { |
| case ORI_ROTATE_90: |
| matrix.setRotate(90, w / 2f, h / 2f); |
| break; |
| case ORI_ROTATE_180: |
| matrix.setRotate(180, w / 2f, h / 2f); |
| break; |
| case ORI_ROTATE_270: |
| matrix.setRotate(270, w / 2f, h / 2f); |
| break; |
| case ORI_FLIP_HOR: |
| matrix.preScale(-1, 1); |
| break; |
| case ORI_FLIP_VERT: |
| matrix.preScale(1, -1); |
| break; |
| case ORI_TRANSPOSE: |
| matrix.setRotate(90, w / 2f, h / 2f); |
| matrix.preScale(1, -1); |
| break; |
| case ORI_TRANSVERSE: |
| matrix.setRotate(270, w / 2f, h / 2f); |
| matrix.preScale(1, -1); |
| break; |
| case ORI_NORMAL: |
| default: |
| return bitmap; |
| } |
| return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), |
| bitmap.getHeight(), matrix, true); |
| } |
| |
| /** |
| * Returns the bounds of the bitmap stored at a given Url. |
| */ |
| public static Rect loadBitmapBounds(Context context, Uri uri) { |
| BitmapFactory.Options o = new BitmapFactory.Options(); |
| loadBitmap(context, uri, o); |
| return new Rect(0, 0, o.outWidth, o.outHeight); |
| } |
| |
| /** |
| * Loads a bitmap that has been downsampled using sampleSize from a given url. |
| */ |
| public static Bitmap loadDownsampledBitmap(Context context, Uri uri, int sampleSize) { |
| BitmapFactory.Options options = new BitmapFactory.Options(); |
| options.inMutable = true; |
| options.inSampleSize = sampleSize; |
| return loadBitmap(context, uri, options); |
| } |
| |
| /** |
| * Returns the bitmap from the given uri loaded using the given options. |
| * Returns null on failure. |
| */ |
| public static Bitmap loadBitmap(Context context, Uri uri, BitmapFactory.Options o) { |
| if (uri == null || context == null) { |
| throw new IllegalArgumentException("bad argument to loadBitmap"); |
| } |
| InputStream is = null; |
| try { |
| is = context.getContentResolver().openInputStream(uri); |
| return BitmapFactory.decodeStream(is, null, o); |
| } catch (FileNotFoundException e) { |
| Log.e(TAG, "FileNotFoundException for " + uri, e); |
| } finally { |
| closeSilently(is); |
| } |
| return null; |
| } |
| |
| /** |
| * Loads a bitmap at a given URI that is downsampled so that both sides are |
| * smaller than maxSideLength. The Bitmap's original dimensions are stored |
| * in the rect originalBounds. |
| * |
| * @param uri URI of image to open. |
| * @param context context whose ContentResolver to use. |
| * @param maxSideLength max side length of returned bitmap. |
| * @param originalBounds If not null, set to the actual bounds of the stored bitmap. |
| * @param useMin use min or max side of the original image |
| * @return downsampled bitmap or null if this operation failed. |
| */ |
| public static Bitmap loadConstrainedBitmap(Uri uri, Context context, int maxSideLength, |
| Rect originalBounds, boolean useMin) { |
| if (maxSideLength <= 0 || uri == null || context == null) { |
| throw new IllegalArgumentException("bad argument to getScaledBitmap"); |
| } |
| // Get width and height of stored bitmap |
| Rect storedBounds = loadBitmapBounds(context, uri); |
| if (originalBounds != null) { |
| originalBounds.set(storedBounds); |
| } |
| int w = storedBounds.width(); |
| int h = storedBounds.height(); |
| |
| // If bitmap cannot be decoded, return null |
| if (w <= 0 || h <= 0) { |
| return null; |
| } |
| |
| // Find best downsampling size |
| int imageSide = 0; |
| if (useMin) { |
| imageSide = Math.min(w, h); |
| } else { |
| imageSide = Math.max(w, h); |
| } |
| int sampleSize = 1; |
| while (imageSide > maxSideLength) { |
| imageSide >>>= 1; |
| sampleSize <<= 1; |
| } |
| |
| // Make sure sample size is reasonable |
| if (sampleSize <= 0 || |
| 0 >= (Math.min(w, h) / sampleSize)) { |
| return null; |
| } |
| return loadDownsampledBitmap(context, uri, sampleSize); |
| } |
| |
| /** |
| * Loads a bitmap at a given URI that is downsampled so that both sides are |
| * smaller than maxSideLength. The Bitmap's original dimensions are stored |
| * in the rect originalBounds. The output is also transformed to the given |
| * orientation. |
| * |
| * @param uri URI of image to open. |
| * @param context context whose ContentResolver to use. |
| * @param maxSideLength max side length of returned bitmap. |
| * @param orientation the orientation to transform the bitmap to. |
| * @param originalBounds set to the actual bounds of the stored bitmap. |
| * @return downsampled bitmap or null if this operation failed. |
| */ |
| public static Bitmap loadOrientedConstrainedBitmap(Uri uri, Context context, int maxSideLength, |
| int orientation, Rect originalBounds) { |
| Bitmap bmap = loadConstrainedBitmap(uri, context, maxSideLength, originalBounds, false); |
| if (bmap != null) { |
| bmap = orientBitmap(bmap, orientation); |
| if (bmap.getConfig()!= Bitmap.Config.ARGB_8888){ |
| bmap = bmap.copy( Bitmap.Config.ARGB_8888,true); |
| } |
| } |
| return bmap; |
| } |
| |
| /** |
| * Loads a bitmap that is downsampled by at least the input sample size. In |
| * low-memory situations, the bitmap may be downsampled further. |
| */ |
| public static Bitmap loadBitmapWithBackouts(Context context, Uri sourceUri, int sampleSize) { |
| boolean noBitmap = true; |
| int num_tries = 0; |
| if (sampleSize <= 0) { |
| sampleSize = 1; |
| } |
| Bitmap bmap = null; |
| while (noBitmap) { |
| try { |
| // Try to decode, downsample if low-memory. |
| bmap = loadDownsampledBitmap(context, sourceUri, sampleSize); |
| noBitmap = false; |
| } catch (java.lang.OutOfMemoryError e) { |
| // Try with more downsampling before failing for good. |
| if (++num_tries >= BITMAP_LOAD_BACKOUT_ATTEMPTS) { |
| throw e; |
| } |
| bmap = null; |
| System.gc(); |
| sampleSize *= 2; |
| } |
| } |
| return bmap; |
| } |
| |
| /** |
| * Loads an oriented bitmap that is downsampled by at least the input sample |
| * size. In low-memory situations, the bitmap may be downsampled further. |
| */ |
| public static Bitmap loadOrientedBitmapWithBackouts(Context context, Uri sourceUri, |
| int sampleSize) { |
| Bitmap bitmap = loadBitmapWithBackouts(context, sourceUri, sampleSize); |
| if (bitmap == null) { |
| return null; |
| } |
| int orientation = getMetadataOrientation(context, sourceUri); |
| bitmap = orientBitmap(bitmap, orientation); |
| return bitmap; |
| } |
| |
| /** |
| * Loads bitmap from a resource that may be downsampled in low-memory situations. |
| */ |
| public static Bitmap decodeResourceWithBackouts(Resources res, BitmapFactory.Options options, |
| int id) { |
| boolean noBitmap = true; |
| int num_tries = 0; |
| if (options.inSampleSize < 1) { |
| options.inSampleSize = 1; |
| } |
| // Stopgap fix for low-memory devices. |
| Bitmap bmap = null; |
| while (noBitmap) { |
| try { |
| // Try to decode, downsample if low-memory. |
| bmap = BitmapFactory.decodeResource( |
| res, id, options); |
| noBitmap = false; |
| } catch (java.lang.OutOfMemoryError e) { |
| // Retry before failing for good. |
| if (++num_tries >= BITMAP_LOAD_BACKOUT_ATTEMPTS) { |
| throw e; |
| } |
| bmap = null; |
| System.gc(); |
| options.inSampleSize *= 2; |
| } |
| } |
| return bmap; |
| } |
| |
| public static List<ExifTag> getExif(ContentResolver resolver, Uri uri) { |
| String path = getLocalPathFromUri(resolver, uri); |
| if (path != null) { |
| Uri localUri = Uri.parse(path); |
| String mimeType = getMimeType(localUri); |
| if (!JPEG_MIME_TYPE.equals(mimeType)) { |
| return null; |
| } |
| try { |
| ExifInterface exif = new ExifInterface(); |
| exif.readExif(path); |
| List<ExifTag> taglist = exif.getAllTags(); |
| return taglist; |
| } catch (IOException e) { |
| Log.w(TAG, "Failed to read EXIF tags", e); |
| } |
| } |
| return null; |
| } |
| |
| private static void closeSilently(Closeable c) { |
| if (c == null) return; |
| try { |
| c.close(); |
| } catch (IOException t) { |
| Log.w(TAG, "close fail ", t); |
| } |
| } |
| |
| } |