1 files changed, 147 insertions, 0 deletions
diff --git a/src/org/cyanogenmod/wallpapers/photophase/utils/BitmapUtils.java b/src/org/cyanogenmod/wallpapers/photophase/utils/BitmapUtils.java
new file mode 100644
index 0000000..f7b32b5
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+++ b/src/org/cyanogenmod/wallpapers/photophase/utils/BitmapUtils.java
@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 2013 The CyanogenMod Project
+ *
+ * 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 org.cyanogenmod.wallpapers.photophase.utils;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.BitmapFactory.Options;
+import android.graphics.Matrix;
+import android.media.ExifInterface;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * A helper class for deal with Bitmaps
+ */
+public class BitmapUtils {
+
+    /**
+     * Method that decodes a bitmap
+     *
+     * @param bitmap The bitmap buffer to decode
+     * @return Bitmap The decoded bitmap
+     */
+    public static Bitmap decodeBitmap(InputStream bitmap) {
+        final BitmapFactory.Options options = new BitmapFactory.Options();
+        options.inPreferQualityOverSpeed = false;
+        options.inPreferredConfig = Bitmap.Config.RGB_565;
+        return BitmapFactory.decodeStream(bitmap, null, options);
+    }
+
+    /**
+     * Method that decodes a bitmap
+     *
+     * @param file The bitmap file to decode
+     * @param reqWidth The request width
+     * @param reqHeight The request height
+     * @return Bitmap The decoded bitmap
+     */
+    public static Bitmap decodeBitmap(File file, int reqWidth, int reqHeight) {
+        // First decode with inJustDecodeBounds=true to check dimensions
+        final BitmapFactory.Options options = new BitmapFactory.Options();
+        options.inJustDecodeBounds = true;
+        BitmapFactory.decodeFile(file.getAbsolutePath(), options);
+
+        // Calculate inSampleSize (use 1024 as maximum size, the minimum supported
+        // by all the gles20 devices)
+        options.inSampleSize = calculateBitmapRatio(
+                                    options,
+                                    Math.min(reqWidth, 1024),
+                                    Math.min(reqHeight, 1024));
+
+        // Decode the bitmap with inSampleSize set
+        options.inJustDecodeBounds = false;
+        options.inPreferQualityOverSpeed = false;
+        options.inPurgeable = true;
+        options.inInputShareable = true;
+        options.inDither = true;
+        Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath(), options);
+        if (bitmap == null) {
+            return null;
+        }
+
+        // Test if the bitmap has exif format, and decode properly
+        Bitmap out = decodeExifBitmap(file, bitmap);
+        if (!out.equals(bitmap)) {
+            bitmap.recycle();
+            bitmap = null;
+        }
+        return out;
+    }
+
+    /**
+     * Method that decodes an Exif bitmap
+     *
+     * @param file The file to decode
+     * @param src The bitmap reference
+     * @return Bitmap The decoded bitmap
+     */
+    private static Bitmap decodeExifBitmap(File file, Bitmap src) {
+        try {
+            // Try to load the bitmap as a bitmap file
+            ExifInterface exif = new ExifInterface(file.getAbsolutePath());
+            int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);
+            if (orientation == 0) {
+                return src;
+            }
+            Matrix matrix = new Matrix();
+            if (orientation == 6) {
+                matrix.postRotate(90);
+            } else if (orientation == 3) {
+                matrix.postRotate(180);
+            } else if (orientation == 8) {
+                matrix.postRotate(270);
+            }
+            // Rotate the bitmap
+            return Bitmap.createBitmap(src, 0, 0, src.getWidth(), src.getHeight(), matrix, true);
+        } catch (IOException e) {
+            // Ignore
+        }
+        return src;
+    }
+
+    /**
+     * Method that calculate the bitmap size prior to decode
+     *
+     * @param options The bitmap factory options
+     * @param reqWidth The request width
+     * @param reqHeight The request height
+     * @return int The picture ratio
+     */
+    private static int calculateBitmapRatio(Options options, int reqWidth, int reqHeight) {
+        // Raw height and width of image
+        final int height = options.outHeight;
+        final int width = options.outWidth;
+        int inSampleSize = 1;
+
+        if (height > reqHeight || width > reqWidth) {
+            // Calculate ratios of height and width to requested height and width
+            final int heightRatio = Math.round((float) height / (float) reqHeight);
+            final int widthRatio = Math.round((float) width / (float) reqWidth);
+
+            // Choose the smallest ratio as inSampleSize value, this will guarantee
+            // a final image with both dimensions larger than or equal to the
+            // requested height and width.
+            inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
+        }
+
+        return inSampleSize;
+    }
+
+}