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diff --git a/libs/hwui/Patch.h b/libs/hwui/Patch.h
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+++ b/libs/hwui/Patch.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_PATCH_H
+#define ANDROID_UI_PATCH_H
+
+#include <sys/types.h>
+
+#include "Vertex.h"
+#include "utils/Compare.h"
+
+namespace android {
+namespace uirenderer {
+
+///////////////////////////////////////////////////////////////////////////////
+// 9-patch structures
+///////////////////////////////////////////////////////////////////////////////
+
+/**
+ * Description of a patch.
+ */
+struct PatchDescription {
+    PatchDescription(): bitmapWidth(0), bitmapHeight(0), pixelWidth(0), pixelHeight(0),
+            xCount(0), yCount(0), emptyCount(0), colorKey(0) { }
+    PatchDescription(const float bitmapWidth, const float bitmapHeight,
+            const float pixelWidth, const float pixelHeight,
+            const uint32_t xCount, const uint32_t yCount,
+            const int8_t emptyCount, const uint32_t colorKey):
+            bitmapWidth(bitmapWidth), bitmapHeight(bitmapHeight),
+            pixelWidth(pixelWidth), pixelHeight(pixelHeight),
+            xCount(xCount), yCount(yCount),
+            emptyCount(emptyCount), colorKey(colorKey) { }
+    PatchDescription(const PatchDescription& description):
+            bitmapWidth(description.bitmapWidth), bitmapHeight(description.bitmapHeight),
+            pixelWidth(description.pixelWidth), pixelHeight(description.pixelHeight),
+            xCount(description.xCount), yCount(description.yCount),
+            emptyCount(description.emptyCount), colorKey(description.colorKey) { }
+
+    float bitmapWidth;
+    float bitmapHeight;
+    float pixelWidth;
+    float pixelHeight;
+    uint32_t xCount;
+    uint32_t yCount;
+    int8_t emptyCount;
+    uint32_t colorKey;
+
+    bool operator<(const PatchDescription& rhs) const {
+        compare(bitmapWidth) {
+            compare(bitmapHeight) {
+                compare(pixelWidth) {
+                    compare(pixelHeight) {
+                        compareI(xCount) {
+                            compareI(yCount) {
+                                compareI(emptyCount) {
+                                    compareI(colorKey) return false;
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        return false;
+    }
+}; // struct PatchDescription
+
+/**
+ * An OpenGL patch. This contains an array of vertices and an array of
+ * indices to render the vertices.
+ */
+struct Patch {
+    Patch(const uint32_t xCount, const uint32_t yCount, const int8_t emptyQuads = 0);
+    ~Patch();
+
+    void updateVertices(const float bitmapWidth, const float bitmapHeight,
+            float left, float top, float right, float bottom,
+            const int32_t* xDivs, const int32_t* yDivs,
+            const uint32_t width, const uint32_t height,
+            const uint32_t colorKey = 0);
+
+    TextureVertex* vertices;
+    uint32_t verticesCount;
+
+private:
+    static inline void generateRow(TextureVertex*& vertex, float y1, float y2,
+            float v1, float v2, const int32_t xDivs[], uint32_t xCount,
+            float stretchX, float width, float bitmapWidth,
+            uint32_t& quadCount, const uint32_t colorKey);
+    static inline void generateQuad(TextureVertex*& vertex,
+            float x1, float y1, float x2, float y2,
+            float u1, float v1, float u2, float v2,
+            uint32_t& quadCount, const uint32_t colorKey);
+}; // struct Patch
+
+}; // namespace uirenderer
+}; // namespace android
+
+#endif // ANDROID_UI_PATCH_H