1 /* 2 * Copyright 2011 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 #include "SkColorMatrixFilter.h" 9 10 static SkScalar byte_to_scale(U8CPU byte) { 11 if (0xFF == byte) { 12 // want to get this exact 13 return 1; 14 } else { 15 return byte * 0.00392156862745f; 16 } 17 } 18 19 SkColorFilter* SkColorMatrixFilter::CreateLightingFilter(SkColor mul, SkColor add) { 20 if (0 == add) { 21 return SkColorFilter::CreateModeFilter(mul | SK_ColorBLACK, 22 SkXfermode::Mode::kModulate_Mode); 23 } 24 SkColorMatrix matrix; 25 matrix.setScale(byte_to_scale(SkColorGetR(mul)), 26 byte_to_scale(SkColorGetG(mul)), 27 byte_to_scale(SkColorGetB(mul)), 28 1); 29 matrix.postTranslate(SkIntToScalar(SkColorGetR(add)), 30 SkIntToScalar(SkColorGetG(add)), 31 SkIntToScalar(SkColorGetB(add)), 32 0); 33 return SkColorMatrixFilter::Create(matrix); 34 } 35
