/** * ownCloud Android client application * * @author David A. Velasco * Copyright (C) 2015 ownCloud Inc. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2, * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . * */ package com.owncloud.android.utils; import com.owncloud.android.lib.common.utils.Log_OC; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Matrix; import android.graphics.BitmapFactory.Options; import android.media.ExifInterface; import android.net.Uri; import android.webkit.MimeTypeMap; import java.io.File; /** * Utility class with methods for decoding Bitmaps. */ public class BitmapUtils { /** * Decodes a bitmap from a file containing it minimizing the memory use, known that the bitmap * will be drawn in a surface of reqWidth x reqHeight * * @param srcPath Absolute path to the file containing the image. * @param reqWidth Width of the surface where the Bitmap will be drawn on, in pixels. * @param reqHeight Height of the surface where the Bitmap will be drawn on, in pixels. * @return */ public static Bitmap decodeSampledBitmapFromFile(String srcPath, int reqWidth, int reqHeight) { // set desired options that will affect the size of the bitmap final Options options = new Options(); options.inScaled = true; options.inPurgeable = true; if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.GINGERBREAD_MR1) { options.inPreferQualityOverSpeed = false; } if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB) { options.inMutable = false; } // make a false load of the bitmap to get its dimensions options.inJustDecodeBounds = true; BitmapFactory.decodeFile(srcPath, options); // calculate factor to subsample the bitmap options.inSampleSize = calculateSampleFactor(options, reqWidth, reqHeight); // decode bitmap with inSampleSize set options.inJustDecodeBounds = false; return BitmapFactory.decodeFile(srcPath, options); } /** * Calculates a proper value for options.inSampleSize in order to decode a Bitmap minimizing * the memory overload and covering a target surface of reqWidth x reqHeight if the original * image is big enough. * * @param options Bitmap decoding options; options.outHeight and options.inHeight should * be set. * @param reqWidth Width of the surface where the Bitmap will be drawn on, in pixels. * @param reqHeight Height of the surface where the Bitmap will be drawn on, in pixels. * @return The largest inSampleSize value that is a power of 2 and keeps both * height and width larger than reqWidth and reqHeight. */ private static int calculateSampleFactor(Options options, int reqWidth, int reqHeight) { final int height = options.outHeight; final int width = options.outWidth; int inSampleSize = 1; if (height > reqHeight || width > reqWidth) { final int halfHeight = height / 2; final int halfWidth = width / 2; // calculates the largest inSampleSize value (for smallest sample) that is a power of 2 and keeps both // height and width **larger** than the requested height and width. while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) { inSampleSize *= 2; } } return inSampleSize; } /** * Rotate bitmap according to EXIF orientation. * Cf. http://www.daveperrett.com/articles/2012/07/28/exif-orientation-handling-is-a-ghetto/ * @param bitmap Bitmap to be rotated * @param storagePath Path to source file of bitmap. Needed for EXIF information. * @return correctly EXIF-rotated bitmap */ public static Bitmap rotateImage(Bitmap bitmap, String storagePath){ Bitmap resultBitmap = bitmap; try { ExifInterface exifInterface = new ExifInterface(storagePath); int orientation = exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1); Matrix matrix = new Matrix(); // 1: nothing to do // 2 if (orientation == ExifInterface.ORIENTATION_FLIP_HORIZONTAL) { matrix.postScale(-1.0f, 1.0f); } // 3 else if (orientation == ExifInterface.ORIENTATION_ROTATE_180) { matrix.postRotate(180); } // 4 else if (orientation == ExifInterface.ORIENTATION_FLIP_VERTICAL) { matrix.postScale(1.0f, -1.0f); } // 5 else if (orientation == ExifInterface.ORIENTATION_TRANSPOSE) { matrix.postRotate(-90); matrix.postScale(1.0f, -1.0f); } // 6 else if (orientation == ExifInterface.ORIENTATION_ROTATE_90) { matrix.postRotate(90); } // 7 else if (orientation == ExifInterface.ORIENTATION_TRANSVERSE) { matrix.postRotate(90); matrix.postScale(1.0f, -1.0f); } // 8 else if (orientation == ExifInterface.ORIENTATION_ROTATE_270) { matrix.postRotate(270); } // Rotate the bitmap resultBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); if (resultBitmap != bitmap) { bitmap.recycle(); } } catch (Exception exception) { Log_OC.e("BitmapUtil", "Could not rotate the image: " + storagePath); } return resultBitmap; } /** * Converts an HSL color value to RGB. Conversion formula * adapted from http://en.wikipedia.org/wiki/HSL_color_space. * Assumes h, s, and l are contained in the set [0, 1] and * returns r, g, and b in the set [0, 255]. * from: http://axonflux.com/handy-rgb-to-hsl-and-rgb-to-hsv-color-model-c * * @param integer h The hue * @param Integer s The saturation * @param Integer l The lightness * @return Array The RGB representation */ public static int[] hslToRgb(Double h, Double s, Double l){ Double r, g, b; if(s == 0){ r = g = b = l; // achromatic } else { Double q = l < 0.5 ? l * (1 + s) : l + s - l * s; Double p = 2 * l - q; r = hue2rgb(p, q, h + 1/3) * 255; g = hue2rgb(p, q, h) * 255; b = hue2rgb(p, q, h - 1/3) * 255; } int[] array = {r.intValue(), g.intValue(), b.intValue()}; return array; } private static Double hue2rgb(Double p, Double q, Double t){ if(t < 0) t += 1; if(t > 1) t -= 1; if(t < 1/6) return p + (q - p) * 6 * t; if(t < 1/2) return q; if(t < 2/3) return p + (q - p) * (2/3 - t) * 6; return p; } /** * Checks if file passed is an image * @param file * @return true/false */ public static boolean isImage(File file) { Uri selectedUri = Uri.fromFile(file); String fileExtension = MimeTypeMap.getFileExtensionFromUrl(selectedUri.toString().toLowerCase()); String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(fileExtension); return (mimeType != null && mimeType.startsWith("image/")); } }