Jim Van Verth | e770578 | 2017-05-04 14:00:59 -0400 | [diff] [blame] | 1 | |
| 2 | /* |
| 3 | * Copyright 2017 Google Inc. |
| 4 | * |
| 5 | * Use of this source code is governed by a BSD-style license that can be |
| 6 | * found in the LICENSE file. |
| 7 | */ |
| 8 | #include "SampleCode.h" |
| 9 | #include "SkAnimTimer.h" |
| 10 | #include "SkBlurMask.h" |
| 11 | #include "SkBlurMaskFilter.h" |
| 12 | #include "SkColorFilter.h" |
| 13 | #include "SkCamera.h" |
| 14 | #include "SkCanvas.h" |
Jim Van Verth | e770578 | 2017-05-04 14:00:59 -0400 | [diff] [blame] | 15 | #include "SkPath.h" |
| 16 | #include "SkPathOps.h" |
| 17 | #include "SkPoint3.h" |
| 18 | #include "SkShadowUtils.h" |
| 19 | #include "SkUtils.h" |
| 20 | #include "SkView.h" |
| 21 | #include "sk_tool_utils.h" |
| 22 | |
| 23 | //////////////////////////////////////////////////////////////////////////// |
| 24 | |
| 25 | class ShadowUtilsView : public SampleView { |
| 26 | SkTArray<SkPath> fPaths; |
| 27 | SkScalar fZDelta; |
| 28 | |
| 29 | bool fShowAmbient; |
| 30 | bool fShowSpot; |
| 31 | bool fUseAlt; |
| 32 | bool fShowObject; |
| 33 | bool fIgnoreShadowAlpha; |
| 34 | |
| 35 | public: |
| 36 | ShadowUtilsView() |
| 37 | : fZDelta(0) |
| 38 | , fShowAmbient(true) |
| 39 | , fShowSpot(true) |
| 40 | , fUseAlt(false) |
| 41 | , fShowObject(false) |
| 42 | , fIgnoreShadowAlpha(false) {} |
| 43 | |
| 44 | protected: |
| 45 | void onOnceBeforeDraw() override { |
| 46 | fPaths.push_back().addRoundRect(SkRect::MakeWH(50, 50), 10, 10); |
| 47 | SkRRect oddRRect; |
| 48 | oddRRect.setNinePatch(SkRect::MakeWH(50, 50), 9, 13, 6, 16); |
| 49 | fPaths.push_back().addRRect(oddRRect); |
| 50 | fPaths.push_back().addRect(SkRect::MakeWH(50, 50)); |
| 51 | fPaths.push_back().addCircle(25, 25, 25); |
| 52 | fPaths.push_back().cubicTo(100, 50, 20, 100, 0, 0); |
| 53 | fPaths.push_back().addOval(SkRect::MakeWH(20, 60)); |
| 54 | } |
| 55 | |
| 56 | // overrides from SkEventSink |
| 57 | bool onQuery(SkEvent* evt) override { |
| 58 | if (SampleCode::TitleQ(*evt)) { |
| 59 | SampleCode::TitleR(evt, "ShadowUtils"); |
| 60 | return true; |
| 61 | } |
| 62 | |
| 63 | SkUnichar uni; |
| 64 | if (SampleCode::CharQ(*evt, &uni)) { |
| 65 | bool handled = false; |
| 66 | switch (uni) { |
| 67 | case 'W': |
| 68 | fShowAmbient = !fShowAmbient; |
| 69 | handled = true; |
| 70 | break; |
| 71 | case 'S': |
| 72 | fShowSpot = !fShowSpot; |
| 73 | handled = true; |
| 74 | break; |
| 75 | case 'T': |
| 76 | fUseAlt = !fUseAlt; |
| 77 | handled = true; |
| 78 | break; |
| 79 | case 'O': |
| 80 | fShowObject = !fShowObject; |
| 81 | handled = true; |
| 82 | break; |
| 83 | case '>': |
| 84 | fZDelta += 0.5f; |
| 85 | handled = true; |
| 86 | break; |
| 87 | case '<': |
| 88 | fZDelta -= 0.5f; |
| 89 | handled = true; |
| 90 | break; |
| 91 | case '?': |
| 92 | fIgnoreShadowAlpha = !fIgnoreShadowAlpha; |
| 93 | handled = true; |
| 94 | break; |
| 95 | default: |
| 96 | break; |
| 97 | } |
| 98 | if (handled) { |
| 99 | this->inval(nullptr); |
| 100 | return true; |
| 101 | } |
| 102 | } |
| 103 | return this->INHERITED::onQuery(evt); |
| 104 | } |
| 105 | |
| 106 | void drawBG(SkCanvas* canvas) { |
Jim Van Verth | 8d1e0ac | 2017-05-05 15:53:23 -0400 | [diff] [blame] | 107 | canvas->drawColor(0xFFFFFFFF); |
Jim Van Verth | e770578 | 2017-05-04 14:00:59 -0400 | [diff] [blame] | 108 | } |
| 109 | |
| 110 | void drawShadowedPath(SkCanvas* canvas, const SkPath& path, |
Jim Van Verth | e308a12 | 2017-05-08 14:19:30 -0400 | [diff] [blame] | 111 | const SkPoint3& zPlaneParams, |
Jim Van Verth | e770578 | 2017-05-04 14:00:59 -0400 | [diff] [blame] | 112 | const SkPaint& paint, SkScalar ambientAlpha, |
| 113 | const SkPoint3& lightPos, SkScalar lightWidth, SkScalar spotAlpha, |
| 114 | uint32_t flags) { |
| 115 | if (fIgnoreShadowAlpha) { |
| 116 | ambientAlpha = 255; |
| 117 | spotAlpha = 255; |
| 118 | } |
| 119 | if (!fShowAmbient) { |
| 120 | ambientAlpha = 0; |
| 121 | } |
| 122 | if (!fShowSpot) { |
| 123 | spotAlpha = 0; |
| 124 | } |
| 125 | if (fUseAlt) { |
| 126 | flags |= SkShadowFlags::kGeometricOnly_ShadowFlag; |
| 127 | } |
Jim Van Verth | 37c5a96 | 2017-05-10 14:13:24 -0400 | [diff] [blame] | 128 | SkShadowUtils::DrawShadow(canvas, path, zPlaneParams, |
| 129 | lightPos, lightWidth, |
| 130 | ambientAlpha, 0, SK_ColorRED, flags); |
| 131 | SkShadowUtils::DrawShadow(canvas, path, zPlaneParams, |
| 132 | lightPos, lightWidth, |
| 133 | 0, spotAlpha, SK_ColorBLUE, flags); |
Jim Van Verth | e770578 | 2017-05-04 14:00:59 -0400 | [diff] [blame] | 134 | |
| 135 | if (fShowObject) { |
| 136 | canvas->drawPath(path, paint); |
| 137 | } else { |
| 138 | SkPaint strokePaint; |
| 139 | |
| 140 | strokePaint.setColor(paint.getColor()); |
| 141 | strokePaint.setStyle(SkPaint::kStroke_Style); |
| 142 | |
| 143 | canvas->drawPath(path, strokePaint); |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | void onDrawContent(SkCanvas* canvas) override { |
| 148 | this->drawBG(canvas); |
| 149 | |
| 150 | static constexpr int kW = 800; |
| 151 | static constexpr SkScalar kPad = 15.f; |
Jim Van Verth | e770578 | 2017-05-04 14:00:59 -0400 | [diff] [blame] | 152 | static constexpr SkScalar kLightR = 100.f; |
| 153 | static constexpr SkScalar kHeight = 50.f; |
| 154 | static constexpr SkScalar kAmbientAlpha = 0.5f; |
| 155 | static constexpr SkScalar kSpotAlpha = 0.5f; |
Jim Van Verth | 8793e38 | 2017-05-22 15:52:21 -0400 | [diff] [blame] | 156 | static constexpr SkPoint3 lightPos = { 250, 400, 500 }; |
Jim Van Verth | 9392f569c | 2017-05-16 15:01:43 -0400 | [diff] [blame] | 157 | |
Jim Van Verth | e770578 | 2017-05-04 14:00:59 -0400 | [diff] [blame] | 158 | canvas->translate(3 * kPad, 3 * kPad); |
| 159 | canvas->save(); |
| 160 | SkScalar x = 0; |
| 161 | SkScalar dy = 0; |
| 162 | SkTDArray<SkMatrix> matrices; |
| 163 | matrices.push()->reset(); |
| 164 | SkMatrix* m = matrices.push(); |
| 165 | m->setRotate(33.f, 25.f, 25.f); |
| 166 | m->postScale(1.2f, 0.8f, 25.f, 25.f); |
| 167 | SkPaint paint; |
| 168 | paint.setColor(SK_ColorGREEN); |
| 169 | paint.setAntiAlias(true); |
Jim Van Verth | e308a12 | 2017-05-08 14:19:30 -0400 | [diff] [blame] | 170 | SkPoint3 zPlaneParams = SkPoint3::Make(0, 0, SkTMax(1.0f, kHeight + fZDelta)); |
Jim Van Verth | e770578 | 2017-05-04 14:00:59 -0400 | [diff] [blame] | 171 | for (auto& m : matrices) { |
| 172 | for (auto flags : { kNone_ShadowFlag, kTransparentOccluder_ShadowFlag }) { |
| 173 | for (const auto& path : fPaths) { |
| 174 | SkRect postMBounds = path.getBounds(); |
| 175 | m.mapRect(&postMBounds); |
| 176 | SkScalar w = postMBounds.width() + kHeight; |
| 177 | SkScalar dx = w + kPad; |
| 178 | if (x + dx > kW - 3 * kPad) { |
| 179 | canvas->restore(); |
| 180 | canvas->translate(0, dy); |
| 181 | canvas->save(); |
| 182 | x = 0; |
| 183 | dy = 0; |
| 184 | } |
| 185 | |
| 186 | canvas->save(); |
| 187 | canvas->concat(m); |
Jim Van Verth | 9392f569c | 2017-05-16 15:01:43 -0400 | [diff] [blame] | 188 | drawShadowedPath(canvas, path, zPlaneParams, paint, kAmbientAlpha, lightPos, |
Jim Van Verth | e308a12 | 2017-05-08 14:19:30 -0400 | [diff] [blame] | 189 | kLightR, kSpotAlpha, flags); |
Jim Van Verth | e770578 | 2017-05-04 14:00:59 -0400 | [diff] [blame] | 190 | canvas->restore(); |
| 191 | |
| 192 | canvas->translate(dx, 0); |
| 193 | x += dx; |
| 194 | dy = SkTMax(dy, postMBounds.height() + kPad + kHeight); |
| 195 | } |
| 196 | } |
| 197 | } |
| 198 | // Show where the light is in x,y as a circle (specified in device space). |
| 199 | SkMatrix invCanvasM = canvas->getTotalMatrix(); |
| 200 | if (invCanvasM.invert(&invCanvasM)) { |
| 201 | canvas->save(); |
| 202 | canvas->concat(invCanvasM); |
| 203 | SkPaint paint; |
| 204 | paint.setColor(SK_ColorBLACK); |
| 205 | paint.setAntiAlias(true); |
Jim Van Verth | 9392f569c | 2017-05-16 15:01:43 -0400 | [diff] [blame] | 206 | canvas->drawCircle(lightPos.fX, lightPos.fY, kLightR / 10.f, paint); |
Jim Van Verth | e770578 | 2017-05-04 14:00:59 -0400 | [diff] [blame] | 207 | canvas->restore(); |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | private: |
| 212 | typedef SampleView INHERITED; |
| 213 | }; |
| 214 | |
| 215 | ////////////////////////////////////////////////////////////////////////////// |
| 216 | |
| 217 | static SkView* MyFactory() { return new ShadowUtilsView; } |
| 218 | static SkViewRegister reg(MyFactory); |