Consider conical shader opaque if it covers entire plane.

src/effects/gradients/SkTwoPointConicalGradient.cpp

 
 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkTwoPointConicalGradient.h"
 
@@ skipping 56 matching lines @@
     fCenterX = SkScalarToFloat(center0.fX);
     fCenterY = SkScalarToFloat(center0.fY);
     fDCenterX = SkScalarToFloat(center1.fX) - fCenterX;
     fDCenterY = SkScalarToFloat(center1.fY) - fCenterY;
     fRadius = SkScalarToFloat(rad0);
     fDRadius = SkScalarToFloat(rad1) - fRadius;
 
     fA = sqr(fDCenterX) + sqr(fDCenterY) - sqr(fDRadius);
     fRadius2 = sqr(fRadius);
     fRDR = fRadius * fDRadius;
+
+    fConeFillsPlane = rad0 != rad1 && SkMaxScalar(rad0, rad1) > SkPoint::Distance(center0, center1);
 }
 
 void TwoPtRadial::setup(SkScalar fx, SkScalar fy, SkScalar dfx, SkScalar dfy) {
     fRelX = SkScalarToFloat(fx) - fCenterX;
     fRelY = SkScalarToFloat(fy) - fCenterY;
     fIncX = SkScalarToFloat(dfx);
     fIncY = SkScalarToFloat(dfy);
     fB = -2 * (fDCenterX * fRelX + fDCenterY * fRelY + fRDR);
     fDB = -2 * (fDCenterX * fIncX + fDCenterY * fIncY);
 }
@@ skipping 95 matching lines @@
     fCenter1(start),
     fCenter2(end),
     fRadius1(startRadius),
     fRadius2(endRadius) {
     // this is degenerate, and should be caught by our caller
     SkASSERT(fCenter1 != fCenter2 || fRadius1 != fRadius2);
     this->init();
 }
 
 bool SkTwoPointConicalGradient::isOpaque() const {
-    // Because areas outside the cone are left untouched, we cannot treat the
-    // shader as opaque even if the gradient itself is opaque.
-    // TODO(junov): Compute whether the cone fills the plane crbug.com/222380
-    return false;
+    return INHERITED::isOpaque() && this->fRec.fConeFillsPlane;
 }
 
 void SkTwoPointConicalGradient::shadeSpan(int x, int y, SkPMColor* dstCParam,
                                           int count) {
     int toggle = init_dither_toggle(x, y);
 
     SkASSERT(count > 0);
 
     SkPMColor* SK_RESTRICT dstC = dstCParam;
 
@@ skipping 550 matching lines @@
     str->appendScalar(fCenter2.fY);
     str->append(") radius2: ");
     str->appendScalar(fRadius2);
     str->append(" ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif