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/**
* 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 <http://www.gnu.org/licenses/>.
*
*/
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;
}
/**
* Convert HSL values to a RGB Color.
*
* @param h Hue is specified as degrees in the range 0 - 360.
* @param s Saturation is specified as a percentage in the range 1 - 100.
* @param l Lumanance is specified as a percentage in the range 1 - 100.
* @paran alpha the alpha value between 0 - 1
* adapted from https://svn.codehaus.org/griffon/builders/gfxbuilder/tags/GFXBUILDER_0.2/
* gfxbuilder-core/src/main/com/camick/awt/HSLColor.java
*/
public static int[] HSLtoRGB(float h, float s, float l, float alpha)
{
if (s <0.0f || s > 100.0f)
{
String message = "Color parameter outside of expected range - Saturation";
throw new IllegalArgumentException( message );
}
if (l <0.0f || l > 100.0f)
{
String message = "Color parameter outside of expected range - Luminance";
throw new IllegalArgumentException( message );
}
if (alpha <0.0f || alpha > 1.0f)
{
String message = "Color parameter outside of expected range - Alpha";
throw new IllegalArgumentException( message );
}
// Formula needs all values between 0 - 1.
h = h % 360.0f;
h /= 360f;
s /= 100f;
l /= 100f;
float q = 0;
if (l < 0.5)
q = l * (1 + s);
else
q = (l + s) - (s * l);
float p = 2 * l - q;
int r = Math.round(Math.max(0, HueToRGB(p, q, h + (1.0f / 3.0f)) * 256));
int g = Math.round(Math.max(0, HueToRGB(p, q, h) * 256));
int b = Math.round(Math.max(0, HueToRGB(p, q, h - (1.0f / 3.0f)) * 256));
int[] array = {r, g, b};
return array;
}
private static float HueToRGB(float p, float q, float h){
if (h < 0) h += 1;
if (h > 1 ) h -= 1;
if (6 * h < 1)
{
return p + ((q - p) * 6 * h);
}
if (2 * h < 1 )
{
return q;
}
if (3 * h < 2)
{
return p + ( (q - p) * 6 * ((2.0f / 3.0f) - h) );
}
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/"));
}
}