1 /* 2 * Copyright 2017 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 "include/core/SkCanvas.h" 9 #include "include/core/SkColorFilter.h" 10 #include "include/core/SkImage.h" 11 #include "include/core/SkPath.h" 12 #include "include/core/SkRegion.h" 13 #include "include/core/SkShader.h" 14 #include "include/effects/SkGradientShader.h" 15 #include "src/base/SkUtils.h" 16 #include "tools/DecodeUtils.h" 17 #include "tools/Resources.h" 18 #include "tools/viewer/ClickHandlerSlide.h" 19 20 const float gMat[] = { 21 .3f, .6f, .1f, 0, 0, 22 .3f, .6f, .1f, 0, 0, 23 .3f, .6f, .1f, 0, 0, 24 0, 0, 0, 1, 0, 25 }; 26 27 class MixerSlide : public ClickHandlerSlide { 28 sk_sp<SkImage> fImg; 29 sk_sp<SkColorFilter> fCF0; 30 sk_sp<SkColorFilter> fCF1; 31 32 float fWeight = 0; 33 float fDW = 0.02f; 34 35 public: MixerSlide()36 MixerSlide() { fName = "Mixer"; } 37 draw(SkCanvas * canvas)38 void draw(SkCanvas* canvas) override { 39 if (!fImg) { 40 fImg = ToolUtils::GetResourceAsImage("images/mandrill_256.png"); 41 fCF0 = SkColorFilters::Matrix(gMat); 42 fCF1 = SkColorFilters::Blend(0xFF44CC88, SkBlendMode::kScreen); 43 } 44 45 float gap = fImg->width() * 3; 46 47 canvas->translate(10, 10); 48 dodraw(canvas, nullptr, fCF1, gap); 49 canvas->translate(0, fImg->height() + 10); 50 dodraw(canvas, fCF0, nullptr, gap); 51 canvas->translate(0, fImg->height() + 10); 52 dodraw(canvas, fCF0, fCF1, gap); 53 54 fWeight += fDW; 55 if (fWeight > 1 || fWeight < 0) { 56 fDW = -fDW; 57 } 58 } 59 60 protected: onFindClickHandler(SkScalar x,SkScalar y,skui::ModifierKey)61 Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) override { 62 return fRect.contains(SkScalarRoundToInt(x), 63 SkScalarRoundToInt(y)) ? new Click() : nullptr; 64 } 65 onClick(Click * click)66 bool onClick(Click* click) override { 67 fRect.offset(click->fCurr.fX - click->fPrev.fX, 68 click->fCurr.fY - click->fPrev.fY); 69 return true; 70 } 71 72 private: dodraw(SkCanvas * canvas,sk_sp<SkColorFilter> cf0,sk_sp<SkColorFilter> cf1,float gap)73 void dodraw(SkCanvas* canvas, sk_sp<SkColorFilter> cf0, sk_sp<SkColorFilter> cf1, float gap) { 74 SkPaint paint; 75 paint.setColorFilter(cf0); 76 canvas->drawImage(fImg, 0, 0, SkSamplingOptions(), &paint); 77 78 paint.setColorFilter(SkColorFilters::Lerp(fWeight, cf0, cf1)); 79 canvas->drawImage(fImg, fImg->width() + gap * fWeight, 0, 80 SkSamplingOptions(), &paint); 81 82 paint.setColorFilter(cf1); 83 canvas->drawImage(fImg, 2*fImg->width() + gap, 0, SkSamplingOptions(), &paint); 84 } 85 86 SkIRect fRect; 87 88 }; 89 DEF_SLIDE( return new MixerSlide; ) 90
