Apply scale in Filter::Resolve3dPoint

This function should be consistent with the
Apply{Horizontal,Vertical}Scale functions. The input |point| is assumed
to be unzoomed - as is the reference box - and the output should have
zoom applied.

Bug: 1198084
Change-Id: If7500635281f431d29ac5a07b92a876f50ca5c05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2818027
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#871585}

third_party/blink/renderer/platform/graphics/filters/filter.cc

@@ -78,13 +78,14 @@ float Filter::ApplyVerticalScale(float value) const {
   return scale_ * value;
 }
 
-FloatPoint3D Filter::Resolve3dPoint(const FloatPoint3D& point) const {
-  if (unit_scaling_ != kBoundingBox)
-    return point;
-  return FloatPoint3D(
-      point.X() * ReferenceBox().Width() + ReferenceBox().X(),
-      point.Y() * ReferenceBox().Height() + ReferenceBox().Y(),
-      point.Z() * sqrtf(ReferenceBox().Size().DiagonalLengthSquared() / 2));
+FloatPoint3D Filter::Resolve3dPoint(FloatPoint3D point) const {
+  if (unit_scaling_ == kBoundingBox) {
+    point = FloatPoint3D(
+        point.X() * ReferenceBox().Width() + ReferenceBox().X(),
+        point.Y() * ReferenceBox().Height() + ReferenceBox().Y(),
+        point.Z() * sqrtf(ReferenceBox().Size().DiagonalLengthSquared() / 2));
+  }
+  return scale_ * point;
 }
 
 void Filter::SetLastEffect(FilterEffect* effect) {

third_party/blink/renderer/platform/graphics/filters/filter.h

@@ -53,7 +53,7 @@ class PLATFORM_EXPORT Filter final : public GarbageCollected<Filter> {
   float ApplyHorizontalScale(float value) const;
   float ApplyVerticalScale(float value) const;
 
-  FloatPoint3D Resolve3dPoint(const FloatPoint3D&) const;
+  FloatPoint3D Resolve3dPoint(FloatPoint3D) const;
 
   const FloatRect& FilterRegion() const { return filter_region_; }
   const FloatRect& ReferenceBox() const { return reference_box_; }