1 /* 2 * Copyright 2021 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include "BlurFilter.h" 20 #include <SkCanvas.h> 21 #include <SkImage.h> 22 #include <SkRuntimeEffect.h> 23 #include <SkSurface.h> 24 25 using namespace std; 26 27 namespace android { 28 namespace renderengine { 29 namespace skia { 30 31 /** 32 * This is an implementation of a Kawase blur, as described in here: 33 * https://community.arm.com/cfs-file/__key/communityserver-blogs-components-weblogfiles/ 34 * 00-00-00-20-66/siggraph2015_2D00_mmg_2D00_marius_2D00_notes.pdf 35 */ 36 class KawaseBlurFilter: public BlurFilter { 37 public: 38 // Maximum number of render passes 39 static constexpr uint32_t kMaxPasses = 4; 40 41 explicit KawaseBlurFilter(); ~KawaseBlurFilter()42 virtual ~KawaseBlurFilter(){} 43 44 // Execute blur, saving it to a texture 45 sk_sp<SkImage> generate(SkiaGpuContext* context, const uint32_t radius, 46 const sk_sp<SkImage> blurInput, const SkRect& blurRect) const override; 47 48 private: 49 sk_sp<SkRuntimeEffect> mBlurEffect; 50 }; 51 52 } // namespace skia 53 } // namespace renderengine 54 } // namespace android 55