1 files changed, 129 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/common/Utils.java b/src/com/android/gallery3d/common/Utils.java
new file mode 100644
index 0000000..8466c22
--- /dev/null
+++ b/src/com/android/gallery3d/common/Utils.java
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2010 The Android Open Source 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 com.android.gallery3d.common;
+
+import android.database.Cursor;
+import android.graphics.RectF;
+import android.os.ParcelFileDescriptor;
+import android.util.Log;
+
+import java.io.Closeable;
+import java.io.IOException;
+
+public class Utils {
+    private static final String TAG = "Utils";
+
+    // Throws AssertionError if the input is false.
+    public static void assertTrue(boolean cond) {
+        if (!cond) {
+            throw new AssertionError();
+        }
+    }
+
+    // Returns the next power of two.
+    // Returns the input if it is already power of 2.
+    // Throws IllegalArgumentException if the input is <= 0 or
+    // the answer overflows.
+    public static int nextPowerOf2(int n) {
+        if (n <= 0 || n > (1 << 30)) throw new IllegalArgumentException("n is invalid: " + n);
+        n -= 1;
+        n |= n >> 16;
+        n |= n >> 8;
+        n |= n >> 4;
+        n |= n >> 2;
+        n |= n >> 1;
+        return n + 1;
+    }
+
+    // Returns the previous power of two.
+    // Returns the input if it is already power of 2.
+    // Throws IllegalArgumentException if the input is <= 0
+    public static int prevPowerOf2(int n) {
+        if (n <= 0) throw new IllegalArgumentException();
+        return Integer.highestOneBit(n);
+    }
+
+    // Returns the input value x clamped to the range [min, max].
+    public static int clamp(int x, int min, int max) {
+        if (x > max) return max;
+        if (x < min) return min;
+        return x;
+    }
+
+    public static int ceilLog2(float value) {
+        int i;
+        for (i = 0; i < 31; i++) {
+            if ((1 << i) >= value) break;
+        }
+        return i;
+    }
+
+    public static int floorLog2(float value) {
+        int i;
+        for (i = 0; i < 31; i++) {
+            if ((1 << i) > value) break;
+        }
+        return i - 1;
+    }
+
+    public static void closeSilently(Closeable c) {
+        if (c == null) return;
+        try {
+            c.close();
+        } catch (IOException t) {
+            Log.w(TAG, "close fail ", t);
+        }
+    }
+
+    public static void closeSilently(ParcelFileDescriptor fd) {
+        try {
+            if (fd != null) fd.close();
+        } catch (Throwable t) {
+            Log.w(TAG, "fail to close", t);
+        }
+    }
+
+    public static void closeSilently(Cursor cursor) {
+        try {
+            if (cursor != null) cursor.close();
+        } catch (Throwable t) {
+            Log.w(TAG, "fail to close", t);
+        }
+    }
+
+    public static RectF getMaxCropRect(
+            int inWidth, int inHeight, int outWidth, int outHeight, boolean leftAligned) {
+        RectF cropRect = new RectF();
+        // Get a crop rect that will fit this
+        if (inWidth / (float) inHeight > outWidth / (float) outHeight) {
+             cropRect.top = 0;
+             cropRect.bottom = inHeight;
+             cropRect.left = (inWidth - (outWidth / (float) outHeight) * inHeight) / 2;
+             cropRect.right = inWidth - cropRect.left;
+             if (leftAligned) {
+                 cropRect.right -= cropRect.left;
+                 cropRect.left = 0;
+             }
+        } else {
+            cropRect.left = 0;
+            cropRect.right = inWidth;
+            cropRect.top = (inHeight - (outHeight / (float) outWidth) * inWidth) / 2;
+            cropRect.bottom = inHeight - cropRect.top;
+        }
+        return cropRect;
+    }
+}