move declaration of CreateLightingFilter into SkColorMatrixFilter

src/effects/SkColorFilters.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBlitRow.h"
 #include "SkColorFilter.h"
 #include "SkColorPriv.h"
 #include "SkModeColorFilter.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkUtils.h"
 #include "SkString.h"
 #include "SkValidationUtils.h"
-#include "SkColorMatrixFilter.h"
 
 bool SkModeColorFilter::asColorMode(SkColor* color, SkXfermode::Mode* mode) const {
     if (color) {
         *color = fColor;
     }
     if (mode) {
         *mode = fMode;
     }
     return true;
 }
@@ skipping 134 matching lines @@
 
     switch (mode) {
         case SkXfermode::kSrc_Mode:
             return new Src_SkModeColorFilter(color);
         case SkXfermode::kSrcOver_Mode:
             return new SrcOver_SkModeColorFilter(color);
         default:
             return SkModeColorFilter::Create(color, mode);
     }
 }
-
-///////////////////////////////////////////////////////////////////////////////
-
-static SkScalar byte_to_scale(U8CPU byte) {
-    if (0xFF == byte) {
-        // want to get this exact
-        return 1;
-    } else {
-        return byte * 0.00392156862745f;
-    }
-}
-
-SkColorFilter* SkColorFilter::CreateLightingFilter(SkColor mul, SkColor add) {
-    SkColorMatrix matrix;
-    matrix.setScale(byte_to_scale(SkColorGetR(mul)),
-                    byte_to_scale(SkColorGetG(mul)),
-                    byte_to_scale(SkColorGetB(mul)),
-                    1);
-    matrix.postTranslate(SkIntToScalar(SkColorGetR(add)),
-                         SkIntToScalar(SkColorGetG(add)),
-                         SkIntToScalar(SkColorGetB(add)),
-                         0);
-    return SkColorMatrixFilter::Create(matrix);
-}
-