mirror of
https://github.com/playmusicexporter/playmusicexporter
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c36675f639
Adds an artwork loader to load artworks from the cache or the internet Improve the selection
81 lines
3.3 KiB
Java
81 lines
3.3 KiB
Java
/*
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* Copyright (c) 2015 David Schulte
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package de.arcus.framework.utils;
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import android.graphics.Bitmap;
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import android.graphics.BitmapFactory;
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/**
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* Class for general image functions
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*/
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public class ImageTools {
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/**
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* Loads a bitmap and scale it down to a maximum size
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* @param bytes The image data
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* @param width The maximal width
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* @param height The maximal height
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* @return The loaded bitmap
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*/
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public static Bitmap decodeByteArraySubsampled(byte[] bytes, int width, int height) {
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// Loads only the image dimensions
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final BitmapFactory.Options options = new BitmapFactory.Options();
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options.inJustDecodeBounds = true;
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BitmapFactory.decodeByteArray(bytes, 0, bytes.length, options);
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// If one side is 0 we load the original bitmap size
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if (width > 0 && height > 0) {
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// Calculate inSampleSize
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options.inSampleSize = calculateSampleSize(options, width, height);
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}
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// Decode bitmap with inSampleSize set
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options.inJustDecodeBounds = false;
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return BitmapFactory.decodeByteArray(bytes, 0, bytes.length, options);
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}
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/**
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* Given the bitmap size and View size calculate a subsampling size (powers of 2)
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* @param options The image optione with the originial size
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* @param width The maximal width
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* @param height The maximal height
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* @return The subsampling size
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*/
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private static int calculateSampleSize( BitmapFactory.Options options, int width, int height) {
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int sampleSize = 1; //Default subsampling size
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// The image is larger than required, we need to scale it down
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if (options.outHeight > height || options.outWidth > width) {
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// Gets the half resolutions
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final int halfHeight = options.outHeight / 2;
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final int halfWidth = options.outWidth / 2;
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// Calculate the largest inSampleSize value that is a power of 2 and keeps both
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// height and width larger than the requested height and width.
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while ((halfHeight / sampleSize) > height
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&& (halfWidth / sampleSize) > width) {
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sampleSize *= 2;
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}
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}
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return sampleSize;
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}
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}
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