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diff --git a/libs/hwui/Layer.h b/libs/hwui/Layer.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_LAYER_H
+#define ANDROID_UI_LAYER_H
+
+#include <sys/types.h>
+
+#include <GLES2/gl2.h>
+
+#include <SkXfermode.h>
+
+#include "Rect.h"
+
+namespace android {
+namespace uirenderer {
+
+/**
+ * Dimensions of a layer.
+ */
+struct LayerSize {
+    LayerSize(): width(0), height(0), id(0) { }
+    LayerSize(const uint32_t width, const uint32_t height): width(width), height(height), id(0) { }
+    LayerSize(const LayerSize& size): width(size.width), height(size.height), id(size.id) { }
+
+    uint32_t width;
+    uint32_t height;
+
+    // Incremental id used by the layer cache to store multiple
+    // LayerSize with the same dimensions
+    uint32_t id;
+
+    bool operator<(const LayerSize& rhs) const {
+        if (id != 0 && rhs.id != 0) {
+            return id < rhs.id;
+        }
+        if (width == rhs.width) {
+            return height < rhs.height;
+        }
+        return width < rhs.width;
+    }
+
+    bool operator==(const LayerSize& rhs) const {
+        return width == rhs.width && height == rhs.height;
+    }
+}; // struct LayerSize
+
+/**
+ * A layer has dimensions and is backed by an OpenGL texture.
+ */
+struct Layer {
+    /**
+     * Coordinates of the layer corresponding to this snapshot.
+     * Only set when the flag kFlagIsLayer is set.
+     */
+    Rect layer;
+    /**
+     * Name of the texture used to render the layer.
+     * Only set when the flag kFlagIsLayer is set.
+     */
+    GLuint texture;
+    /**
+     * Name of the FBO used to render the layer.
+     * Only set when the flag kFlagIsLayer is set.
+     */
+    GLuint fbo;
+    /**
+     * Opacity of the layer.
+     * Only set when the flag kFlagIsLayer is set.
+     */
+    float alpha;
+    /**
+     * Blending mode of the layer.
+     * Only set when the flag kFlagIsLayer is set.
+     */
+    SkXfermode::Mode mode;
+    /**
+     * Indicates whether this layer should be blended.
+     */
+    bool blend;
+}; // struct Layer
+
+}; // namespace uirenderer
+}; // namespace android
+
+#endif // ANDROID_UI_LAYER_H