[SVGDom] Linear gradient 'spreadMethod' support

experimental/svg/model/SkSVGAttributeParser.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkParse.h"
 #include "SkSVGAttributeParser.h"
 #include "SkSVGTypes.h"
@@ skipping 473 matching lines @@
         if (this->parseExpectedStringToken(gJoinInfo[i].fName)) {
             *join = SkSVGLineJoin(gJoinInfo[i].fType);
             parsedValue = true;
             break;
         }
     }
 
     return parsedValue && this->parseEOSToken();
 }
 
+// https://www.w3.org/TR/SVG/pservers.html#LinearGradientElementSpreadMethodAttribute
+bool SkSVGAttributeParser::parseSpreadMethod(SkSVGSpreadMethod* spread) {
+    static const struct {
+        SkSVGSpreadMethod::Type fType;
+        const char*             fName;
+    } gSpreadInfo[] = {
+        { SkSVGSpreadMethod::Type::kPad    , "pad"     },
+        { SkSVGSpreadMethod::Type::kReflect, "reflect" },
+        { SkSVGSpreadMethod::Type::kRepeat , "repeat"  },
+    };
+
+    bool parsedValue = false;
+    for (size_t i = 0; i < SK_ARRAY_COUNT(gSpreadInfo); ++i) {
+        if (this->parseExpectedStringToken(gSpreadInfo[i].fName)) {
+            *spread = SkSVGSpreadMethod(gSpreadInfo[i].fType);
+            parsedValue = true;
+            break;
+        }
+    }
+
+    return parsedValue && this->parseEOSToken();
+}
+
 // https://www.w3.org/TR/SVG/shapes.html#PolygonElementPointsAttribute
 bool SkSVGAttributeParser::parsePoints(SkSVGPointsType* points) {
     SkTDArray<SkPoint> pts;
 
     bool parsedValue = false;
     for (;;) {
         this->parseWSToken();
 
         SkScalar x, y;
         if (!this->parseScalarToken(&x)) {
@@ skipping 17 matching lines @@
         parsedValue = true;
     }
 
     if (parsedValue && this->parseEOSToken()) {
         *points = pts;
         return true;
     }
 
     return false;
 }