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diff --git a/libs/hwui/SkiaShader.h b/libs/hwui/SkiaShader.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_SKIA_SHADER_H
+#define ANDROID_UI_SKIA_SHADER_H
+
+#include <SkShader.h>
+#include <SkXfermode.h>
+
+#include <GLES2/gl2.h>
+
+#include "Extensions.h"
+#include "ProgramCache.h"
+#include "TextureCache.h"
+#include "GradientCache.h"
+#include "Snapshot.h"
+
+namespace android {
+namespace uirenderer {
+
+///////////////////////////////////////////////////////////////////////////////
+// Base shader
+///////////////////////////////////////////////////////////////////////////////
+
+/**
+ * Represents a Skia shader. A shader will modify the GL context and active
+ * program to recreate the original effect.
+ */
+struct SkiaShader {
+    /**
+     * Type of Skia shader in use.
+     */
+    enum Type {
+        kNone,
+        kBitmap,
+        kLinearGradient,
+        kCircularGradient,
+        kSweepGradient,
+        kCompose
+    };
+
+    SkiaShader(Type type, SkShader* key, SkShader::TileMode tileX, SkShader::TileMode tileY,
+            SkMatrix* matrix, bool blend);
+    virtual ~SkiaShader();
+
+    virtual void describe(ProgramDescription& description, const Extensions& extensions);
+    virtual void setupProgram(Program* program, const mat4& modelView, const Snapshot& snapshot,
+            GLuint* textureUnit);
+
+    inline bool blend() const {
+        return mBlend;
+    }
+
+    Type type() const {
+        return mType;
+    }
+
+    virtual void set(TextureCache* textureCache, GradientCache* gradientCache) {
+        mTextureCache = textureCache;
+        mGradientCache = gradientCache;
+    }
+
+    void setMatrix(SkMatrix* matrix) {
+        mMatrix = matrix;
+    }
+
+protected:
+    inline void bindTexture(GLuint texture, GLenum wrapS, GLenum wrapT, GLuint textureUnit);
+
+    Type mType;
+    SkShader* mKey;
+    SkShader::TileMode mTileX;
+    SkShader::TileMode mTileY;
+    SkMatrix* mMatrix;
+    bool mBlend;
+
+    TextureCache* mTextureCache;
+    GradientCache* mGradientCache;
+}; // struct SkiaShader
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Implementations
+///////////////////////////////////////////////////////////////////////////////
+
+/**
+ * A shader that draws a bitmap.
+ */
+struct SkiaBitmapShader: public SkiaShader {
+    SkiaBitmapShader(SkBitmap* bitmap, SkShader* key, SkShader::TileMode tileX,
+            SkShader::TileMode tileY, SkMatrix* matrix, bool blend);
+
+    void describe(ProgramDescription& description, const Extensions& extensions);
+    void setupProgram(Program* program, const mat4& modelView, const Snapshot& snapshot,
+            GLuint* textureUnit);
+
+private:
+    /**
+     * This method does not work for n == 0.
+     */
+    inline bool isPowerOfTwo(unsigned int n) {
+        return !(n & (n - 1));
+    }
+
+    SkBitmap* mBitmap;
+    const Texture* mTexture;
+}; // struct SkiaBitmapShader
+
+/**
+ * A shader that draws a linear gradient.
+ */
+struct SkiaLinearGradientShader: public SkiaShader {
+    SkiaLinearGradientShader(float* bounds, uint32_t* colors, float* positions, int count,
+            SkShader* key, SkShader::TileMode tileMode, SkMatrix* matrix, bool blend);
+    ~SkiaLinearGradientShader();
+
+    void describe(ProgramDescription& description, const Extensions& extensions);
+    void setupProgram(Program* program, const mat4& modelView, const Snapshot& snapshot,
+            GLuint* textureUnit);
+
+private:
+    float* mBounds;
+    uint32_t* mColors;
+    float* mPositions;
+    int mCount;
+}; // struct SkiaLinearGradientShader
+
+/**
+ * A shader that draws two shaders, composited with an xfermode.
+ */
+struct SkiaComposeShader: public SkiaShader {
+    SkiaComposeShader(SkiaShader* first, SkiaShader* second, SkXfermode::Mode mode, SkShader* key);
+
+    void set(TextureCache* textureCache, GradientCache* gradientCache);
+
+    void describe(ProgramDescription& description, const Extensions& extensions);
+    void setupProgram(Program* program, const mat4& modelView, const Snapshot& snapshot,
+            GLuint* textureUnit);
+
+private:
+    SkiaShader* mFirst;
+    SkiaShader* mSecond;
+    SkXfermode::Mode mMode;
+}; // struct SkiaComposeShader
+
+}; // namespace uirenderer
+}; // namespace android
+
+#endif // ANDROID_UI_SKIA_SHADER_H