diff --git a/services/surfaceflinger/RenderEngine/GLES10RenderEngine.cpp b/services/surfaceflinger/RenderEngine/GLES10RenderEngine.cpp
index 9a47568..579affb 100644
--- a/services/surfaceflinger/RenderEngine/GLES10RenderEngine.cpp
+++ b/services/surfaceflinger/RenderEngine/GLES10RenderEngine.cpp
@@ -28,13 +28,25 @@
 }
 
 void GLES10RenderEngine::setupLayerBlending(
+#ifdef USE_HWC2
+    bool premultipliedAlpha, bool opaque, float alpha) {
+#else
     bool premultipliedAlpha, bool opaque, int alpha) {
+#endif
     // OpenGL ES 1.0 doesn't support texture combiners.
     // This path doesn't properly handle opaque layers that have non-opaque
     // alpha values. The alpha channel will be copied into the framebuffer or
     // screenshot, so if the framebuffer or screenshot is blended on top of
     // something else,  whatever is below the window will incorrectly show
     // through.
+#ifdef USE_HWC2
+    if (CC_UNLIKELY(alpha < 1.0f)) {
+        if (premultipliedAlpha) {
+            glColor4f(alpha, alpha, alpha, alpha);
+        } else {
+            glColor4f(1.0f, 1.0f, 1.0f, alpha);
+        }
+#else
     if (CC_UNLIKELY(alpha < 0xFF)) {
         GLfloat floatAlpha = alpha * (1.0f / 255.0f);
         if (premultipliedAlpha) {
@@ -42,12 +54,17 @@
         } else {
             glColor4f(1.0f, 1.0f, 1.0f, floatAlpha);
         }
+#endif
         glTexEnvx(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
     } else {
         glTexEnvx(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
     }
 
+#ifdef USE_HWC2
+    if (alpha < 1.0f || !opaque) {
+#else
     if (alpha < 0xFF || !opaque) {
+#endif
         glEnable(GL_BLEND);
         glBlendFunc(premultipliedAlpha ? GL_ONE : GL_SRC_ALPHA,
                     GL_ONE_MINUS_SRC_ALPHA);
diff --git a/services/surfaceflinger/RenderEngine/GLES10RenderEngine.h b/services/surfaceflinger/RenderEngine/GLES10RenderEngine.h
index f9c7c04..61abd6a 100644
--- a/services/surfaceflinger/RenderEngine/GLES10RenderEngine.h
+++ b/services/surfaceflinger/RenderEngine/GLES10RenderEngine.h
@@ -30,7 +30,12 @@
 class GLES10RenderEngine : public GLES11RenderEngine {
     virtual ~GLES10RenderEngine();
 protected:
+#ifdef USE_HWC2
+    virtual void setupLayerBlending(bool premultipliedAlpha, bool opaque,
+            float alpha) override;
+#else
     virtual void setupLayerBlending(bool premultipliedAlpha, bool opaque, int alpha);
+#endif
 };
 
 // ---------------------------------------------------------------------------
diff --git a/services/surfaceflinger/RenderEngine/GLES11RenderEngine.cpp b/services/surfaceflinger/RenderEngine/GLES11RenderEngine.cpp
index 1a9f59b..847cdb3 100644
--- a/services/surfaceflinger/RenderEngine/GLES11RenderEngine.cpp
+++ b/services/surfaceflinger/RenderEngine/GLES11RenderEngine.cpp
@@ -107,20 +107,33 @@
     glMatrixMode(GL_MODELVIEW);
 }
 
+#ifdef USE_HWC2
+void GLES11RenderEngine::setupLayerBlending(bool premultipliedAlpha,
+        bool opaque, float alpha) {
+#else
 void GLES11RenderEngine::setupLayerBlending(
     bool premultipliedAlpha, bool opaque, int alpha) {
+#endif
     GLenum combineRGB;
     GLenum combineAlpha;
     GLenum src0Alpha;
     GLfloat envColor[4];
 
+#ifdef USE_HWC2
+    if (CC_UNLIKELY(alpha < 1.0f)) {
+#else
     if (CC_UNLIKELY(alpha < 0xFF)) {
+#endif
         // Cv = premultiplied ? Cs*alpha : Cs
         // Av = !opaque       ? As*alpha : As
         combineRGB   = premultipliedAlpha ? GL_MODULATE : GL_REPLACE;
         combineAlpha = !opaque            ? GL_MODULATE : GL_REPLACE;
         src0Alpha    = GL_CONSTANT;
+#ifdef USE_HWC2
+        envColor[0]  = alpha;
+#else
         envColor[0]  = alpha * (1.0f / 255.0f);
+#endif
     } else {
         // Cv = Cs
         // Av = opaque ? 1.0 : As
@@ -152,7 +165,11 @@
         glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, envColor);
     }
 
+#ifdef USE_HWC2
+    if (alpha < 1.0f || !opaque) {
+#else
     if (alpha < 0xFF || !opaque) {
+#endif
         glEnable(GL_BLEND);
         glBlendFunc(premultipliedAlpha ? GL_ONE : GL_SRC_ALPHA,
                     GL_ONE_MINUS_SRC_ALPHA);
@@ -161,16 +178,28 @@
     }
 }
 
+#ifdef USE_HWC2
+void GLES11RenderEngine::setupDimLayerBlending(float alpha) {
+#else
 void GLES11RenderEngine::setupDimLayerBlending(int alpha) {
+#endif
     glDisable(GL_TEXTURE_EXTERNAL_OES);
     glDisable(GL_TEXTURE_2D);
+#ifdef USE_HWC2
+    if (alpha == 1.0f) {
+#else
     if (alpha == 0xFF) {
+#endif
         glDisable(GL_BLEND);
     } else {
         glEnable(GL_BLEND);
         glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
     }
+#ifdef USE_HWC2
+    glColor4f(0, 0, 0, alpha);
+#else
     glColor4f(0, 0, 0, alpha/255.0f);
+#endif
 }
 
 void GLES11RenderEngine::setupLayerTexturing(const Texture& texture) {
diff --git a/services/surfaceflinger/RenderEngine/GLES11RenderEngine.h b/services/surfaceflinger/RenderEngine/GLES11RenderEngine.h
index 08de646..4cd968d 100644
--- a/services/surfaceflinger/RenderEngine/GLES11RenderEngine.h
+++ b/services/surfaceflinger/RenderEngine/GLES11RenderEngine.h
@@ -51,9 +51,17 @@
 
     virtual void dump(String8& result);
     virtual void setViewportAndProjection(size_t vpw, size_t vph,
-            Rect sourceCrop, size_t hwh, bool yswap, Transform::orientation_flags rotation);
-    virtual void setupLayerBlending(bool premultipliedAlpha, bool opaque, int alpha);
+            Rect sourceCrop, size_t hwh, bool yswap,
+            Transform::orientation_flags rotation);
+#ifdef USE_HWC2
+    virtual void setupLayerBlending(bool premultipliedAlpha, bool opaque,
+            float alpha) override;
+    virtual void setupDimLayerBlending(float alpha) override;
+#else
+    virtual void setupLayerBlending(bool premultipliedAlpha, bool opaque,
+            int alpha);
     virtual void setupDimLayerBlending(int alpha);
+#endif
     virtual void setupLayerTexturing(const Texture& texture);
     virtual void setupLayerBlackedOut();
     virtual void setupFillWithColor(float r, float g, float b, float a) ;
diff --git a/services/surfaceflinger/RenderEngine/GLES20RenderEngine.cpp b/services/surfaceflinger/RenderEngine/GLES20RenderEngine.cpp
index 1fabaf5..406e611 100644
--- a/services/surfaceflinger/RenderEngine/GLES20RenderEngine.cpp
+++ b/services/surfaceflinger/RenderEngine/GLES20RenderEngine.cpp
@@ -117,14 +117,25 @@
     mVpHeight = vph;
 }
 
+#ifdef USE_HWC2
+void GLES20RenderEngine::setupLayerBlending(bool premultipliedAlpha,
+        bool opaque, float alpha) {
+#else
 void GLES20RenderEngine::setupLayerBlending(
     bool premultipliedAlpha, bool opaque, int alpha) {
+#endif
 
     mState.setPremultipliedAlpha(premultipliedAlpha);
     mState.setOpaque(opaque);
+#ifdef USE_HWC2
+    mState.setPlaneAlpha(alpha);
+
+    if (alpha < 1.0f || !opaque) {
+#else
     mState.setPlaneAlpha(alpha / 255.0f);
 
     if (alpha < 0xFF || !opaque) {
+#endif
         glEnable(GL_BLEND);
         glBlendFunc(premultipliedAlpha ? GL_ONE : GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     } else {
@@ -132,14 +143,26 @@
     }
 }
 
+#ifdef USE_HWC2
+void GLES20RenderEngine::setupDimLayerBlending(float alpha) {
+#else
 void GLES20RenderEngine::setupDimLayerBlending(int alpha) {
+#endif
     mState.setPlaneAlpha(1.0f);
     mState.setPremultipliedAlpha(true);
     mState.setOpaque(false);
+#ifdef USE_HWC2
+    mState.setColor(0, 0, 0, alpha);
+#else
     mState.setColor(0, 0, 0, alpha/255.0f);
+#endif
     mState.disableTexture();
 
+#ifdef USE_HWC2
+    if (alpha == 1.0f) {
+#else
     if (alpha == 0xFF) {
+#endif
         glDisable(GL_BLEND);
     } else {
         glEnable(GL_BLEND);
diff --git a/services/surfaceflinger/RenderEngine/GLES20RenderEngine.h b/services/surfaceflinger/RenderEngine/GLES20RenderEngine.h
index 819356a..7c3f9b5 100644
--- a/services/surfaceflinger/RenderEngine/GLES20RenderEngine.h
+++ b/services/surfaceflinger/RenderEngine/GLES20RenderEngine.h
@@ -66,9 +66,17 @@
 
     virtual void dump(String8& result);
     virtual void setViewportAndProjection(size_t vpw, size_t vph,
-            Rect sourceCrop, size_t hwh, bool yswap, Transform::orientation_flags rotation);
-    virtual void setupLayerBlending(bool premultipliedAlpha, bool opaque, int alpha);
+            Rect sourceCrop, size_t hwh, bool yswap,
+            Transform::orientation_flags rotation);
+#ifdef USE_HWC2
+    virtual void setupLayerBlending(bool premultipliedAlpha, bool opaque,
+            float alpha) override;
+    virtual void setupDimLayerBlending(float alpha) override;
+#else
+    virtual void setupLayerBlending(bool premultipliedAlpha, bool opaque,
+            int alpha);
     virtual void setupDimLayerBlending(int alpha);
+#endif
     virtual void setupLayerTexturing(const Texture& texture);
     virtual void setupLayerBlackedOut();
     virtual void setupFillWithColor(float r, float g, float b, float a);
diff --git a/services/surfaceflinger/RenderEngine/RenderEngine.h b/services/surfaceflinger/RenderEngine/RenderEngine.h
index 31a961e..9cc1ed7 100644
--- a/services/surfaceflinger/RenderEngine/RenderEngine.h
+++ b/services/surfaceflinger/RenderEngine/RenderEngine.h
@@ -93,8 +93,13 @@
     virtual void checkErrors() const;
     virtual void setViewportAndProjection(size_t vpw, size_t vph,
             Rect sourceCrop, size_t hwh, bool yswap, Transform::orientation_flags rotation) = 0;
+#ifdef USE_HWC2
+    virtual void setupLayerBlending(bool premultipliedAlpha, bool opaque, float alpha) = 0;
+    virtual void setupDimLayerBlending(float alpha) = 0;
+#else
     virtual void setupLayerBlending(bool premultipliedAlpha, bool opaque, int alpha) = 0;
     virtual void setupDimLayerBlending(int alpha) = 0;
+#endif
     virtual void setupLayerTexturing(const Texture& texture) = 0;
     virtual void setupLayerBlackedOut() = 0;
     virtual void setupFillWithColor(float r, float g, float b, float a) = 0;