1 files changed, 92 insertions, 0 deletions
diff --git a/src/org/cyanogenmod/themes/provider/BitmapUtils.java b/src/org/cyanogenmod/themes/provider/BitmapUtils.java
new file mode 100644
index 0000000..4a49068
--- /dev/null
+++ b/src/org/cyanogenmod/themes/provider/BitmapUtils.java
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2014 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.themes.provider;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.net.Uri;
+import android.util.Log;
+
+import java.io.Closeable;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+
+public class BitmapUtils {
+    private static final String TAG = "BitmapUtils";
+    private static final int BITMAP_LOAD_BACKOUT_ATTEMPTS = 5;
+
+    /**
+     * Returns the bitmap from the given uri loaded using the given options.
+     * Returns null on failure.
+     */
+    public static Bitmap loadBitmap(Context context, InputStream is, BitmapFactory.Options o) {
+        try {
+            return BitmapFactory.decodeStream(is, null, o);
+        } finally {
+            closeSilently(is);
+        }
+    }
+
+    /**
+     * Loads a bitmap that has been downsampled using sampleSize from a given url.
+     */
+    public static Bitmap loadDownsampledBitmap(Context context, InputStream is, int sampleSize) {
+        BitmapFactory.Options options = new BitmapFactory.Options();
+        options.inMutable = true;
+        options.inSampleSize = sampleSize;
+        return loadBitmap(context, is, options);
+    }
+
+    /**
+     * Loads a bitmap that is downsampled by at least the input sample size. In
+     * low-memory situations, the bitmap may be downsampled further.
+     */
+    public static Bitmap loadBitmapWithBackouts(Context context, InputStream is, int sampleSize) {
+        boolean noBitmap = true;
+        int num_tries = 0;
+        if (sampleSize <= 0) {
+            sampleSize = 1;
+        }
+        Bitmap bmap = null;
+        while (noBitmap) {
+            try {
+                // Try to decode, downsample if low-memory.
+                bmap = loadDownsampledBitmap(context, is, sampleSize);
+                noBitmap = false;
+            } catch (java.lang.OutOfMemoryError e) {
+                // Try with more downsampling before failing for good.
+                if (++num_tries >= BITMAP_LOAD_BACKOUT_ATTEMPTS) {
+                    throw e;
+                }
+                bmap = null;
+                System.gc();
+                sampleSize *= 2;
+            }
+        }
+        return bmap;
+    }
+
+    public static void closeSilently(Closeable c) {
+        if (c == null) return;
+        try {
+            c.close();
+        } catch (IOException t) {
+            Log.w(TAG, "close fail ", t);
+        }
+    }
+}