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diff --git a/libs/hwui/Snapshot.h b/libs/hwui/Snapshot.h
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+++ b/libs/hwui/Snapshot.h
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+/*
+ * 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.
+ */
+
+#ifndef ANDROID_UI_SNAPSHOT_H
+#define ANDROID_UI_SNAPSHOT_H
+
+#include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+
+#include <utils/RefBase.h>
+
+#include <SkRegion.h>
+
+#include "Layer.h"
+#include "Matrix.h"
+#include "Rect.h"
+
+namespace android {
+namespace uirenderer {
+
+/**
+ * A snapshot holds information about the current state of the rendering
+ * surface. A snapshot is usually created whenever the user calls save()
+ * and discarded when the user calls restore(). Once a snapshot is created,
+ * it can hold information for deferred rendering.
+ *
+ * Each snapshot has a link to a previous snapshot, indicating the previous
+ * state of the renderer.
+ */
+class Snapshot: public LightRefBase<Snapshot> {
+public:
+    Snapshot(): invisible(false), flags(0), previous(NULL), layer(NULL), fbo(0) { }
+
+    /**
+     * Copies the specified snapshot. Only the transform and clip rectangle
+     * are copied. The layer information is set to 0 and the transform is
+     * assumed to be dirty. The specified snapshot is stored as the previous
+     * snapshot.
+     */
+    Snapshot(const sp<Snapshot>& s):
+            height(s->height),
+            transform(s->transform),
+            clipRect(s->clipRect),
+            invisible(s->invisible),
+            flags(0),
+            previous(s),
+            layer(NULL),
+            fbo(s->fbo),
+            viewport(s->viewport) {
+        if ((s->flags & Snapshot::kFlagClipSet) &&
+                !(s->flags & Snapshot::kFlagDirtyLocalClip)) {
+            localClip.set(s->localClip);
+        } else {
+            flags |= Snapshot::kFlagDirtyLocalClip;
+        }
+    }
+
+    /**
+     * Various flags set on #flags.
+     */
+    enum Flags {
+        /**
+         * Indicates that the clip region was modified. When this
+         * snapshot is restored so must the clip.
+         */
+        kFlagClipSet = 0x1,
+        /**
+         * Indicates that this snapshot was created when saving
+         * a new layer.
+         */
+        kFlagIsLayer = 0x2,
+        /**
+         * Indicates that this snapshot has changed the ortho matrix.
+         */
+        kFlagDirtyOrtho = 0x4,
+        /**
+         * Indicates that the local clip should be recomputed.
+         */
+        kFlagDirtyLocalClip = 0x8,
+    };
+
+    /**
+     * Intersects the current clip with the new clip rectangle.
+     */
+    bool clip(float left, float top, float right, float bottom, SkRegion::Op op) {
+        bool clipped = false;
+
+        Rect r(left, top, right, bottom);
+        transform.mapRect(r);
+
+        switch (op) {
+            case SkRegion::kDifference_Op:
+                break;
+            case SkRegion::kIntersect_Op:
+                clipped = clipRect.intersect(r);
+                break;
+            case SkRegion::kUnion_Op:
+                clipped = clipRect.unionWith(r);
+                break;
+            case SkRegion::kXOR_Op:
+                break;
+            case SkRegion::kReverseDifference_Op:
+                break;
+            case SkRegion::kReplace_Op:
+                clipRect.set(r);
+                clipped = true;
+                break;
+        }
+
+        if (clipped) {
+            flags |= Snapshot::kFlagClipSet | Snapshot::kFlagDirtyLocalClip;
+        }
+
+        return clipped;
+    }
+
+    /**
+     * Sets the current clip.
+     */
+    void setClip(float left, float top, float right, float bottom) {
+        clipRect.set(left, top, right, bottom);
+        flags |= Snapshot::kFlagClipSet | Snapshot::kFlagDirtyLocalClip;
+    }
+
+    const Rect& getLocalClip() {
+        if (flags & Snapshot::kFlagDirtyLocalClip) {
+            mat4 inverse;
+            inverse.loadInverse(transform);
+
+            localClip.set(clipRect);
+            inverse.mapRect(localClip);
+
+            flags &= ~Snapshot::kFlagDirtyLocalClip;
+        }
+        return localClip;
+    }
+
+    /**
+     * Height of the framebuffer the snapshot is rendering into.
+     */
+    int height;
+
+    /**
+     * Local transformation. Holds the current translation, scale and
+     * rotation values.
+     */
+    mat4 transform;
+
+    /**
+     * Current clip region. The clip is stored in canvas-space coordinates,
+     * (screen-space coordinates in the regular case.)
+     */
+    Rect clipRect;
+
+    /**
+     * If true, the layer won't be rendered.
+     */
+    bool invisible;
+
+    /**
+     * Dirty flags.
+     */
+    int flags;
+
+    /**
+     * Previous snapshot.
+     */
+    sp<Snapshot> previous;
+
+    /**
+     * Only set when the flag kFlagIsLayer is set.
+     */
+    Layer* layer;
+    GLuint fbo;
+
+    /**
+     * Current viewport.
+     */
+    Rect viewport;
+
+    /**
+     * Contains the previous ortho matrix.
+     */
+    mat4 orthoMatrix;
+
+private:
+    Rect localClip;
+
+}; // class Snapshot
+
+}; // namespace uirenderer
+}; // namespace android
+
+#endif // ANDROID_UI_SNAPSHOT_H