MediaStoreBitmapHunter.java

/*
 * Copyright (C) 2014 Square, Inc.
 *
 * 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.squareup.picasso;

import android.annotation.TargetApi;
import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.provider.MediaStore;
import java.io.IOException;

import static android.content.ContentUris.parseId;
import static android.provider.MediaStore.Images.Thumbnails.FULL_SCREEN_KIND;
import static android.provider.MediaStore.Images.Thumbnails.MICRO_KIND;
import static android.provider.MediaStore.Images.Thumbnails.MINI_KIND;
import static android.provider.MediaStore.Images.Thumbnails.getThumbnail;
import static com.squareup.picasso.MediaStoreBitmapHunter.PicassoKind.FULL;
import static com.squareup.picasso.MediaStoreBitmapHunter.PicassoKind.MICRO;
import static com.squareup.picasso.MediaStoreBitmapHunter.PicassoKind.MINI;

class MediaStoreBitmapHunter extends ContentStreamBitmapHunter {
	private static final String[] CONTENT_ORIENTATION = new String[] { MediaStore.Images.ImageColumns.ORIENTATION };

	@SuppressWarnings("rawtypes")
	MediaStoreBitmapHunter(Context context, Picasso picasso,
			Dispatcher dispatcher, Cache cache, Stats stats, Action action) {
		super(context, picasso, dispatcher, cache, stats, action);
	}

	@TargetApi(Build.VERSION_CODES.ECLAIR)
	@Override
	Bitmap decode(Request data) throws IOException {
		ContentResolver contentResolver = context.getContentResolver();
		setExifRotation(getExitOrientation(contentResolver, data.uri));

		if (data.hasSize()) {
			PicassoKind picassoKind = getPicassoKind(data.targetWidth,
					data.targetHeight);
			if (picassoKind == FULL) {
				return super.decode(data);
			}

			long id = parseId(data.uri);

			BitmapFactory.Options options = createBitmapOptions(data);
			options.inJustDecodeBounds = true;

			calculateInSampleSize(data.targetWidth, data.targetHeight,
					picassoKind.width, picassoKind.height, options);

			Bitmap result = getThumbnail(contentResolver, id,
					picassoKind.androidKind, options);

			if (result != null) {
				return result;
			}
		}

		return super.decode(data);
	}

	static PicassoKind getPicassoKind(int targetWidth, int targetHeight) {
		if (targetWidth <= MICRO.width && targetHeight <= MICRO.height) {
			return MICRO;
		} else if (targetWidth <= MINI.width && targetHeight <= MINI.height) {
			return MINI;
		}
		return FULL;
	}

	static int getExitOrientation(ContentResolver contentResolver, Uri uri) {
		Cursor cursor = null;
		try {
			cursor = contentResolver.query(uri, CONTENT_ORIENTATION, null,
					null, null);
			if (cursor == null || !cursor.moveToFirst()) {
				return 0;
			}
			return cursor.getInt(0);
		} catch (RuntimeException ignored) {
			// If the orientation column doesn't exist, assume no rotation.
			return 0;
		} finally {
			if (cursor != null) {
				cursor.close();
			}
		}
	}

	enum PicassoKind {
		MICRO(MICRO_KIND, 96, 96), MINI(MINI_KIND, 512, 384), FULL(
				FULL_SCREEN_KIND, -1, -1);

		final int androidKind;
		final int width;
		final int height;

		PicassoKind(int androidKind, int width, int height) {
			this.androidKind = androidKind;
			this.width = width;
			this.height = height;
		}
	}
}