| /* |
| * Copyright 2018 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| @class { |
| #include "SkColorData.h" |
| |
| SkPMColor4f constantOutputForConstantInput(const SkPMColor4f& input) const override { |
| float luma = SK_ITU_BT709_LUM_COEFF_R * input.fR + |
| SK_ITU_BT709_LUM_COEFF_G * input.fG + |
| SK_ITU_BT709_LUM_COEFF_B * input.fB; |
| return { 0, 0, 0, luma }; |
| } |
| } |
| |
| void main() { |
| const half3 SK_ITU_BT709_LUM_COEFF = half3(0.2126, 0.7152, 0.0722); |
| half luma = dot(SK_ITU_BT709_LUM_COEFF, sk_InColor.rgb); |
| sk_OutColor = half4(0, 0, 0, luma); |
| } |
