[SVGDom] Linear gradient 'gradientTransform' support

R=stephana@google.com,robertphillips@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2339533002

Review-Url: https://codereview.chromium.org/2339533002

4 files changed, 47 insertions, 34 deletions

diff --git a/experimental/svg/model/SkSVGAttribute.h b/experimental/svg/model/SkSVGAttribute.h
index 13a6041b4b..478a26b261 100644
--- a/experimental/svg/model/SkSVGAttribute.h
+++ b/experimental/svg/model/SkSVGAttribute.h
@@ -19,6 +19,7 @@ enum class SkSVGAttribute {
     kD,
     kFill,
     kFillOpacity,
+    kGradientTransform,
     kHeight,
     kHref,
     kOffset,
diff --git a/experimental/svg/model/SkSVGDOM.cpp b/experimental/svg/model/SkSVGDOM.cpp
index 26944737f1..f467c5e6d0 100644
--- a/experimental/svg/model/SkSVGDOM.cpp
+++ b/experimental/svg/model/SkSVGDOM.cpp
@@ -251,37 +251,38 @@ struct AttrParseInfo {
 };
 
 SortedDictionaryEntry<AttrParseInfo> gAttributeParseInfo[] = {
-    { "cx"             , { SkSVGAttribute::kCx            , SetLengthAttribute       }},
-    { "cy"             , { SkSVGAttribute::kCy            , SetLengthAttribute       }},
-    { "d"              , { SkSVGAttribute::kD             , SetPathDataAttribute     }},
-    { "fill"           , { SkSVGAttribute::kFill          , SetPaintAttribute        }},
-    { "fill-opacity"   , { SkSVGAttribute::kFillOpacity   , SetNumberAttribute       }},
-    { "height"         , { SkSVGAttribute::kHeight        , SetLengthAttribute       }},
-    { "offset"         , { SkSVGAttribute::kOffset        , SetLengthAttribute       }},
-    { "opacity"        , { SkSVGAttribute::kOpacity       , SetNumberAttribute       }},
-    { "points"         , { SkSVGAttribute::kPoints        , SetPointsAttribute       }},
-    { "r"              , { SkSVGAttribute::kR             , SetLengthAttribute       }},
-    { "rx"             , { SkSVGAttribute::kRx            , SetLengthAttribute       }},
-    { "ry"             , { SkSVGAttribute::kRy            , SetLengthAttribute       }},
-    { "spreadMethod"   , { SkSVGAttribute::kSpreadMethod  , SetSpreadMethodAttribute }},
-    { "stop-color"     , { SkSVGAttribute::kStopColor     , SetColorAttribute        }},
-    { "stop-opacity"   , { SkSVGAttribute::kStopOpacity   , SetNumberAttribute       }},
-    { "stroke"         , { SkSVGAttribute::kStroke        , SetPaintAttribute        }},
-    { "stroke-linecap" , { SkSVGAttribute::kStrokeLineCap , SetLineCapAttribute      }},
-    { "stroke-linejoin", { SkSVGAttribute::kStrokeLineJoin, SetLineJoinAttribute     }},
-    { "stroke-opacity" , { SkSVGAttribute::kStrokeOpacity , SetNumberAttribute       }},
-    { "stroke-width"   , { SkSVGAttribute::kStrokeWidth   , SetLengthAttribute       }},
-    { "style"          , { SkSVGAttribute::kUnknown       , SetStyleAttributes       }},
-    { "transform"      , { SkSVGAttribute::kTransform     , SetTransformAttribute    }},
-    { "viewBox"        , { SkSVGAttribute::kViewBox       , SetViewBoxAttribute      }},
-    { "width"          , { SkSVGAttribute::kWidth         , SetLengthAttribute       }},
-    { "x"              , { SkSVGAttribute::kX             , SetLengthAttribute       }},
-    { "x1"             , { SkSVGAttribute::kX1            , SetLengthAttribute       }},
-    { "x2"             , { SkSVGAttribute::kX2            , SetLengthAttribute       }},
-    { "xlink:href"     , { SkSVGAttribute::kHref          , SetIRIAttribute          }},
-    { "y"              , { SkSVGAttribute::kY             , SetLengthAttribute       }},
-    { "y1"             , { SkSVGAttribute::kY1            , SetLengthAttribute       }},
-    { "y2"             , { SkSVGAttribute::kY2            , SetLengthAttribute       }},
+    { "cx"               , { SkSVGAttribute::kCx               , SetLengthAttribute       }},
+    { "cy"               , { SkSVGAttribute::kCy               , SetLengthAttribute       }},
+    { "d"                , { SkSVGAttribute::kD                , SetPathDataAttribute     }},
+    { "fill"             , { SkSVGAttribute::kFill             , SetPaintAttribute        }},
+    { "fill-opacity"     , { SkSVGAttribute::kFillOpacity      , SetNumberAttribute       }},
+    { "gradientTransform", { SkSVGAttribute::kGradientTransform, SetTransformAttribute    }},
+    { "height"           , { SkSVGAttribute::kHeight           , SetLengthAttribute       }},
+    { "offset"           , { SkSVGAttribute::kOffset           , SetLengthAttribute       }},
+    { "opacity"          , { SkSVGAttribute::kOpacity          , SetNumberAttribute       }},
+    { "points"           , { SkSVGAttribute::kPoints           , SetPointsAttribute       }},
+    { "r"                , { SkSVGAttribute::kR                , SetLengthAttribute       }},
+    { "rx"               , { SkSVGAttribute::kRx               , SetLengthAttribute       }},
+    { "ry"               , { SkSVGAttribute::kRy               , SetLengthAttribute       }},
+    { "spreadMethod"     , { SkSVGAttribute::kSpreadMethod     , SetSpreadMethodAttribute }},
+    { "stop-color"       , { SkSVGAttribute::kStopColor        , SetColorAttribute        }},
+    { "stop-opacity"     , { SkSVGAttribute::kStopOpacity      , SetNumberAttribute       }},
+    { "stroke"           , { SkSVGAttribute::kStroke           , SetPaintAttribute        }},
+    { "stroke-linecap"   , { SkSVGAttribute::kStrokeLineCap    , SetLineCapAttribute      }},
+    { "stroke-linejoin"  , { SkSVGAttribute::kStrokeLineJoin   , SetLineJoinAttribute     }},
+    { "stroke-opacity"   , { SkSVGAttribute::kStrokeOpacity    , SetNumberAttribute       }},
+    { "stroke-width"     , { SkSVGAttribute::kStrokeWidth      , SetLengthAttribute       }},
+    { "style"            , { SkSVGAttribute::kUnknown          , SetStyleAttributes       }},
+    { "transform"        , { SkSVGAttribute::kTransform        , SetTransformAttribute    }},
+    { "viewBox"          , { SkSVGAttribute::kViewBox          , SetViewBoxAttribute      }},
+    { "width"            , { SkSVGAttribute::kWidth            , SetLengthAttribute       }},
+    { "x"                , { SkSVGAttribute::kX                , SetLengthAttribute       }},
+    { "x1"               , { SkSVGAttribute::kX1               , SetLengthAttribute       }},
+    { "x2"               , { SkSVGAttribute::kX2               , SetLengthAttribute       }},
+    { "xlink:href"       , { SkSVGAttribute::kHref             , SetIRIAttribute          }},
+    { "y"                , { SkSVGAttribute::kY                , SetLengthAttribute       }},
+    { "y1"               , { SkSVGAttribute::kY1               , SetLengthAttribute       }},
+    { "y2"               , { SkSVGAttribute::kY2               , SetLengthAttribute       }},
 };
 
 SortedDictionaryEntry<sk_sp<SkSVGNode>(*)()> gTagFactories[] = {
diff --git a/experimental/svg/model/SkSVGLinearGradient.cpp b/experimental/svg/model/SkSVGLinearGradient.cpp
index 289c5e3276..4bbed1c354 100644
--- a/experimental/svg/model/SkSVGLinearGradient.cpp
+++ b/experimental/svg/model/SkSVGLinearGradient.cpp
@@ -17,6 +17,10 @@ void SkSVGLinearGradient::setHref(const SkSVGStringType& href) {
     fHref = std::move(href);
 }
 
+void SkSVGLinearGradient::setGradientTransform(const SkSVGTransformType& t) {
+    fGradientTransform = t;
+}
+
 void SkSVGLinearGradient::setSpreadMethod(const SkSVGSpreadMethod& spread) {
     fSpreadMethod = spread;
 }
@@ -39,6 +43,11 @@ void SkSVGLinearGradient::setY2(const SkSVGLength& y2) {
 
 void SkSVGLinearGradient::onSetAttribute(SkSVGAttribute attr, const SkSVGValue& v) {
     switch (attr) {
+    case SkSVGAttribute::kGradientTransform:
+        if (const auto* t = v.as<SkSVGTransformValue>()) {
+            this->setGradientTransform(*t);
+        }
+        break;
     case SkSVGAttribute::kHref:
         if (const auto* href = v.as<SkSVGStringValue>()) {
             this->setHref(*href);
@@ -130,6 +139,6 @@ bool SkSVGLinearGradient::onAsPaint(const SkSVGRenderContext& ctx, SkPaint* pain
     const auto tileMode = static_cast<SkShader::TileMode>(fSpreadMethod.type());
 
     paint->setShader(SkGradientShader::MakeLinear(pts, colors.begin(), pos.begin(), colors.count(),
-                                                  tileMode));
+                                                  tileMode, 0, &fGradientTransform.value()));
     return true;
 }
diff --git a/experimental/svg/model/SkSVGLinearGradient.h b/experimental/svg/model/SkSVGLinearGradient.h
index e12b5245e8..2e4e3f5dee 100644
--- a/experimental/svg/model/SkSVGLinearGradient.h
+++ b/experimental/svg/model/SkSVGLinearGradient.h
@@ -19,6 +19,7 @@ public:
     }
 
     void setHref(const SkSVGStringType&);
+    void setGradientTransform(const SkSVGTransformType&);
     void setSpreadMethod(const SkSVGSpreadMethod&);
     void setX1(const SkSVGLength&);
     void setY1(const SkSVGLength&);
@@ -42,8 +43,9 @@ private:
     SkSVGLength fX2 = SkSVGLength(100, SkSVGLength::Unit::kPercentage);
     SkSVGLength fY2 = SkSVGLength(0  , SkSVGLength::Unit::kPercentage);
 
-    SkSVGStringType   fHref;
-    SkSVGSpreadMethod fSpreadMethod = SkSVGSpreadMethod(SkSVGSpreadMethod::Type::kPad);
+    SkSVGStringType    fHref;
+    SkSVGTransformType fGradientTransform = SkSVGTransformType(SkMatrix::I());
+    SkSVGSpreadMethod  fSpreadMethod = SkSVGSpreadMethod(SkSVGSpreadMethod::Type::kPad);
 
     typedef SkSVGHiddenContainer INHERITED;
 };