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[pub/Android/ownCloud.git] / src / com / owncloud / android / utils / BitmapUtils.java

diff --git a/src/com/owncloud/android/utils/BitmapUtils.java b/src/com/owncloud/android/utils/BitmapUtils.java
index 687b5a4..87cc488 100644 (file)
--- a/src/com/owncloud/android/utils/BitmapUtils.java
+++ b/src/com/owncloud/android/utils/BitmapUtils.java
@@ -16,9 +16,13 @@
  */
 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;
 
 /**
  * Utility class with methods for decoding Bitmaps.
@@ -96,4 +100,114 @@ public class BitmapUtils {
         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;
+    }
+    
+    
 }