Generic 4f gradient T sampler fallback

src/effects/gradients/SkLinearGradient.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 "Sk4fLinearGradient.h"
 #include "SkLinearGradient.h"
 
@@ skipping 33 matching lines @@
     matrix.setSinCos(-vec.fY, vec.fX, pts[0].fX, pts[0].fY);
     matrix.postTranslate(-pts[0].fX, -pts[0].fY);
     matrix.postScale(inv, inv);
     return matrix;
 }
 
 static bool use_4f_context(const SkShader::ContextRec& rec, uint32_t flags) {
 #ifdef FORCE_4F_CONTEXT
     return true;
 #else
-    // Perspective not supported in 4f yet.
-    if (rec.fMatrix->hasPerspective()
-        || (rec.fLocalMatrix && rec.fLocalMatrix->hasPerspective())) {
-        return false;
-    }
-
     return rec.fPreferredDstType == SkShader::ContextRec::kPM4f_DstType
         || SkToBool(flags & SkLinearGradient::kForce4fContext_PrivateFlag);
 #endif
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 SkLinearGradient::SkLinearGradient(const SkPoint pts[2], const Descriptor& desc)
     : SkGradientShaderBase(desc, pts_to_unit_matrix(pts))
     , fStart(pts[0])
@@ skipping 690 matching lines @@
             this->shade4_dx_clamp<false, true>(dstC, count, fx, dx, invDx, dither);
         }
     } else {
         if (fApplyAlphaAfterInterp) {
             this->shade4_dx_clamp<true, false>(dstC, count, fx, dx, invDx, dither);
         } else {
             this->shade4_dx_clamp<false, false>(dstC, count, fx, dx, invDx, dither);
         }
     }
 }