Initial commit from Gmail's Cache system.

Change-Id: I14168ab3bc02b77399a1812f62bd77ac797232c5

1 files changed, 66 insertions, 0 deletions

diff --git a/src/com/android/bitmap/util/RectUtils.java b/src/com/android/bitmap/util/RectUtils.java
new file mode 100644
index 0000000..70eb0de
--- /dev/null
+++ b/src/com/android/bitmap/util/RectUtils.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2013 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.bitmap.util;
+
+import android.graphics.Matrix;
+import android.graphics.Rect;
+import android.graphics.RectF;
+
+public class RectUtils {
+
+    /**
+     * Transform the upright full rectangle so that it bounds the original rotated image,
+     * given by the orientation. Transform the upright partial rectangle such that it would apply
+     * to the same region of the transformed full rectangle.
+     *
+     * The top-left of the transformed full rectangle will always be placed at (0, 0).
+     * @param orientation The exif orientation (0, 90, 180, 270) of the original image. The
+     *                    transformed full and partial rectangles will be in this orientation's
+     *                    coordinate space.
+     * @param fullRect    The upright full rectangle. This rectangle will be modified.
+     * @param partialRect The upright partial rectangle. This rectangle will be modified.
+     */
+    public static void rotateRectForOrientation(final int orientation, final Rect fullRect,
+            final Rect partialRect) {
+        final Matrix matrix = new Matrix();
+        // Exif orientation specifies how the camera is rotated relative to the actual subject.
+        // First rotate in the opposite direction.
+        matrix.setRotate(-orientation);
+        final RectF fullRectF = new RectF(fullRect);
+        final RectF partialRectF = new RectF(partialRect);
+        matrix.mapRect(fullRectF);
+        matrix.mapRect(partialRectF);
+        // Then translate so that the upper left corner of the rotated full rect is at (0,0).
+        matrix.reset();
+        matrix.setTranslate(-fullRectF.left, -fullRectF.top);
+        matrix.mapRect(fullRectF);
+        matrix.mapRect(partialRectF);
+        // Orientation transformation is complete.
+        fullRect.set((int) fullRectF.left, (int) fullRectF.top, (int) fullRectF.right,
+                (int) fullRectF.bottom);
+        partialRect.set((int) partialRectF.left, (int) partialRectF.top, (int) partialRectF.right,
+                (int) partialRectF.bottom);
+    }
+
+    public static void rotateRect(final int degrees, final int px, final int py, final Rect rect) {
+        final RectF rectF = new RectF(rect);
+        final Matrix matrix = new Matrix();
+        matrix.setRotate(degrees, px, py);
+        matrix.mapRect(rectF);
+        rect.set((int) rectF.left, (int) rectF.top, (int) rectF.right, (int) rectF.bottom);
+    }
+}