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      1 /*
      2  * Copyright 2018 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 @optimizationFlags {
      9     kPreservesOpaqueInput_OptimizationFlag | kConstantOutputForConstantInput_OptimizationFlag
     10 }
     11 
     12 void main() {
     13     sk_OutColor = sk_InColor;
     14     half invAlpha = sk_InColor.a <= 0 ? 0 : 1 / sk_InColor.a;
     15     sk_OutColor.rgb *= invAlpha;
     16 }
     17 
     18 @class {
     19     GrColor4f constantOutputForConstantInput(GrColor4f input) const override {
     20         return input.unpremul();
     21     }
     22 }