Revert of Remove unused (by clients) SkUnitMapper (https://codereview.chromium.org/283273002/)

gm/shadertext.cpp

Index: gm/shadertext.cpp
diff --git a/gm/shadertext.cpp b/gm/shadertext.cpp
index 292acdd7a61ad2c94676c0b21bf6c6a7f2d1ba6e..b9e28be898f6bc3e2201e881086d5ca23eeba79f 100644
--- a/gm/shadertext.cpp
+++ b/gm/shadertext.cpp
@@ -1,13 +1,14 @@
+
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
-
 #include "gm.h"
 #include "SkCanvas.h"
 #include "SkGradientShader.h"
+#include "SkUnitMappers.h"
 
 namespace skiagm {
 
@@ -22,9 +23,15 @@
     SkScalar    pos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
     SkPaint     paint;
 
+    SkUnitMapper*   um = NULL;
+
+    um = new SkCosineMapper;
+
+    SkAutoUnref au(um);
+
     paint.setDither(true);
     paint.setShader(SkGradientShader::CreateLinear(pts, colors, pos,
-                SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode))->unref();
+                SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode, um))->unref();
     canvas.drawPaint(paint);
 }
 
@@ -54,26 +61,32 @@
     { 5, gColors, NULL },
 };
 
-static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
-    return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos, data.fCount, tm);
-}
-
-static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
+static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data,
+                            SkShader::TileMode tm, SkUnitMapper* mapper) {
+    return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos,
+                                          data.fCount, tm, mapper);
+}
+
+static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data,
+                            SkShader::TileMode tm, SkUnitMapper* mapper) {
     SkPoint center;
     center.set(SkScalarAve(pts[0].fX, pts[1].fX),
                SkScalarAve(pts[0].fY, pts[1].fY));
     return SkGradientShader::CreateRadial(center, center.fX, data.fColors,
-                                          data.fPos, data.fCount, tm);
-}
-
-static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data, SkShader::TileMode) {
+                                          data.fPos, data.fCount, tm, mapper);
+}
+
+static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data,
+                           SkShader::TileMode, SkUnitMapper* mapper) {
     SkPoint center;
     center.set(SkScalarAve(pts[0].fX, pts[1].fX),
                SkScalarAve(pts[0].fY, pts[1].fY));
-    return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors, data.fPos, data.fCount);
-}
-
-static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm) {
+    return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors,
+                                         data.fPos, data.fCount, mapper);
+}
+
+static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data,
+                           SkShader::TileMode tm, SkUnitMapper* mapper) {
     SkPoint center0, center1;
     center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
                 SkScalarAve(pts[0].fY, pts[1].fY));
@@ -82,11 +95,11 @@
     return SkGradientShader::CreateTwoPointRadial(
                             center1, (pts[1].fX - pts[0].fX) / 7,
                             center0, (pts[1].fX - pts[0].fX) / 2,
-                            data.fColors, data.fPos, data.fCount, tm);
-}
-
-typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data, SkShader::TileMode tm);
-    
+                            data.fColors, data.fPos, data.fCount, tm, mapper);
+}
+
+typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data,
+                     SkShader::TileMode tm, SkUnitMapper* mapper);
 static const GradMaker gGradMakers[] = {
     MakeLinear, MakeRadial, MakeSweep, Make2Radial
 };
@@ -141,7 +154,8 @@
             for (size_t m = 0; m < SK_ARRAY_COUNT(gGradMakers); ++m) {
                 shaders[shdIdx++] = gGradMakers[m](pts,
                                                    gGradData[d],
-                                                   SkShader::kClamp_TileMode);
+                                                   SkShader::kClamp_TileMode,
+                                                   NULL);
             }
         }
         for (size_t tx = 0; tx < SK_ARRAY_COUNT(tileModes); ++tx) {