1 /* 2 * Copyright 2024 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 <SkCanvas.h> 20 #include <SkImage.h> 21 #include <SkRuntimeEffect.h> 22 #include <SkSurface.h> 23 #include "BlurFilter.h" 24 25 namespace android { 26 namespace renderengine { 27 namespace skia { 28 29 /** 30 * This is an implementation of a Kawase blur with dual-filtering passes, as described in here: 31 * https://community.arm.com/cfs-file/__key/communityserver-blogs-components-weblogfiles/00-00-00-20-66/siggraph2015_2D00_mmg_2D00_marius_2D00_slides.pdf 32 * https://community.arm.com/cfs-file/__key/communityserver-blogs-components-weblogfiles/00-00-00-20-66/siggraph2015_2D00_mmg_2D00_marius_2D00_notes.pdf 33 */ 34 class KawaseBlurDualFilter : public BlurFilter { 35 public: 36 explicit KawaseBlurDualFilter(); ~KawaseBlurDualFilter()37 virtual ~KawaseBlurDualFilter() {} 38 39 // Execute blur, saving it to a texture 40 sk_sp<SkImage> generate(SkiaGpuContext* context, const uint32_t radius, 41 const sk_sp<SkImage> blurInput, const SkRect& blurRect) const override; 42 43 private: 44 sk_sp<SkRuntimeEffect> mLowSampleBlurEffect; 45 sk_sp<SkRuntimeEffect> mHighSampleBlurEffect; 46 47 void blurInto(const sk_sp<SkSurface>& drawSurface, const sk_sp<SkImage>& readImage, 48 const float radius, const float alpha, const sk_sp<SkRuntimeEffect>&) const; 49 50 void blurInto(const sk_sp<SkSurface>& drawSurface, const sk_sp<SkShader> input, 51 const float radius, const float alpha, const sk_sp<SkRuntimeEffect>&) const; 52 }; 53 54 } // namespace skia 55 } // namespace renderengine 56 } // namespace android 57