Jim Van Verth | 34d6e4b | 2017-06-09 11:09:03 -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 | */ |
Ben Wagner | b2c4ea6 | 2018-08-08 11:36:17 -0400 | [diff] [blame] | 8 | #include "Sample.h" |
Jim Van Verth | 34d6e4b | 2017-06-09 11:09:03 -0400 | [diff] [blame] | 9 | #include "Resources.h" |
| 10 | #include "SkCanvas.h" |
| 11 | #include "SkImage.h" |
| 12 | #include "SkPath.h" |
| 13 | #include "SkPoint3.h" |
| 14 | #include "SkShadowUtils.h" |
| 15 | |
| 16 | //////////////////////////////////////////////////////////////////////////// |
| 17 | // Sample to demonstrate tonal color shadows |
| 18 | |
Ben Wagner | b2c4ea6 | 2018-08-08 11:36:17 -0400 | [diff] [blame] | 19 | class ShadowColorView : public Sample { |
Jim Van Verth | 34d6e4b | 2017-06-09 11:09:03 -0400 | [diff] [blame] | 20 | SkPath fRectPath; |
| 21 | int fZIndex; |
| 22 | |
| 23 | bool fShowAmbient; |
| 24 | bool fShowSpot; |
| 25 | bool fUseAlt; |
| 26 | bool fShowObject; |
| 27 | bool fTwoPassColor; |
| 28 | bool fDarkBackground; |
| 29 | |
| 30 | public: |
| 31 | ShadowColorView() |
| 32 | : fZIndex(8) |
| 33 | , fShowAmbient(true) |
| 34 | , fShowSpot(true) |
| 35 | , fUseAlt(false) |
| 36 | , fShowObject(true) |
| 37 | , fTwoPassColor(false) |
| 38 | , fDarkBackground(false) {} |
| 39 | |
| 40 | protected: |
| 41 | void onOnceBeforeDraw() override { |
| 42 | fRectPath.addRect(SkRect::MakeXYWH(-50, -50, 100, 100)); |
| 43 | } |
| 44 | |
Ben Wagner | b2c4ea6 | 2018-08-08 11:36:17 -0400 | [diff] [blame] | 45 | bool onQuery(Sample::Event* evt) override { |
| 46 | if (Sample::TitleQ(*evt)) { |
| 47 | Sample::TitleR(evt, "ShadowColor"); |
Jim Van Verth | 34d6e4b | 2017-06-09 11:09:03 -0400 | [diff] [blame] | 48 | return true; |
| 49 | } |
| 50 | |
| 51 | SkUnichar uni; |
Ben Wagner | b2c4ea6 | 2018-08-08 11:36:17 -0400 | [diff] [blame] | 52 | if (Sample::CharQ(*evt, &uni)) { |
Jim Van Verth | 34d6e4b | 2017-06-09 11:09:03 -0400 | [diff] [blame] | 53 | bool handled = false; |
| 54 | switch (uni) { |
| 55 | case 'W': |
| 56 | fShowAmbient = !fShowAmbient; |
| 57 | handled = true; |
| 58 | break; |
| 59 | case 'S': |
| 60 | fShowSpot = !fShowSpot; |
| 61 | handled = true; |
| 62 | break; |
| 63 | case 'T': |
| 64 | fUseAlt = !fUseAlt; |
| 65 | handled = true; |
| 66 | break; |
| 67 | case 'O': |
| 68 | fShowObject = !fShowObject; |
| 69 | handled = true; |
| 70 | break; |
| 71 | case 'X': |
| 72 | fTwoPassColor = !fTwoPassColor; |
| 73 | handled = true; |
| 74 | break; |
| 75 | case 'Z': |
| 76 | fDarkBackground = !fDarkBackground; |
| 77 | handled = true; |
| 78 | break; |
| 79 | case '>': |
| 80 | fZIndex = SkTMin(9, fZIndex+1); |
| 81 | handled = true; |
| 82 | break; |
| 83 | case '<': |
| 84 | fZIndex = SkTMax(0, fZIndex-1); |
| 85 | handled = true; |
| 86 | break; |
| 87 | default: |
| 88 | break; |
| 89 | } |
| 90 | if (handled) { |
Jim Van Verth | 34d6e4b | 2017-06-09 11:09:03 -0400 | [diff] [blame] | 91 | return true; |
| 92 | } |
| 93 | } |
| 94 | return this->INHERITED::onQuery(evt); |
| 95 | } |
| 96 | |
| 97 | void drawShadowedPath(SkCanvas* canvas, const SkPath& path, |
| 98 | const SkPoint3& zPlaneParams, |
| 99 | const SkPaint& paint, SkScalar ambientAlpha, |
| 100 | const SkPoint3& lightPos, SkScalar lightWidth, SkScalar spotAlpha) { |
| 101 | if (!fShowAmbient) { |
| 102 | ambientAlpha = 0; |
| 103 | } |
| 104 | if (!fShowSpot) { |
| 105 | spotAlpha = 0; |
| 106 | } |
| 107 | uint32_t flags = 0; |
| 108 | if (fUseAlt) { |
| 109 | flags |= SkShadowFlags::kGeometricOnly_ShadowFlag; |
| 110 | } |
| 111 | |
| 112 | if (fTwoPassColor) { |
Jim Van Verth | a556684 | 2018-02-22 10:58:34 -0500 | [diff] [blame] | 113 | SkColor ambientColor = SkColorSetARGB(ambientAlpha*255, 0, 0, 0); |
Jim Van Verth | 34d6e4b | 2017-06-09 11:09:03 -0400 | [diff] [blame] | 114 | SkShadowUtils::DrawShadow(canvas, path, zPlaneParams, |
| 115 | lightPos, lightWidth, |
Jim Van Verth | a556684 | 2018-02-22 10:58:34 -0500 | [diff] [blame] | 116 | ambientColor, SK_ColorTRANSPARENT, flags); |
Jim Van Verth | 34d6e4b | 2017-06-09 11:09:03 -0400 | [diff] [blame] | 117 | |
| 118 | if (paint.getColor() != SK_ColorBLACK) { |
| 119 | SkColor color = paint.getColor(); |
| 120 | |
| 121 | uint8_t max = SkTMax(SkTMax(SkColorGetR(color), SkColorGetG(color)), |
| 122 | SkColorGetB(color)); |
| 123 | uint8_t min = SkTMin(SkTMin(SkColorGetR(color), SkColorGetG(color)), |
| 124 | SkColorGetB(color)); |
| 125 | SkScalar luminance = 0.5f*(max + min) / 255.f; |
| 126 | SkScalar alpha = (.6 - .4*luminance)*luminance*luminance + 0.3f; |
| 127 | spotAlpha -= (alpha - 0.3f)*.5f; |
Jim Van Verth | a556684 | 2018-02-22 10:58:34 -0500 | [diff] [blame] | 128 | SkColor spotColor = SkColorSetARGB(alpha*SkColorGetA(color), SkColorGetR(color), |
| 129 | SkColorGetG(color), SkColorGetB(color)); |
Jim Van Verth | 34d6e4b | 2017-06-09 11:09:03 -0400 | [diff] [blame] | 130 | |
| 131 | SkShadowUtils::DrawShadow(canvas, path, zPlaneParams, |
| 132 | lightPos, lightWidth, |
Jim Van Verth | a556684 | 2018-02-22 10:58:34 -0500 | [diff] [blame] | 133 | SK_ColorTRANSPARENT, spotColor, flags); |
Jim Van Verth | 34d6e4b | 2017-06-09 11:09:03 -0400 | [diff] [blame] | 134 | } |
| 135 | |
Jim Van Verth | a556684 | 2018-02-22 10:58:34 -0500 | [diff] [blame] | 136 | SkColor spotGreyscale = SkColorSetARGB(spotAlpha * 255, 0, 0, 0); |
Jim Van Verth | 34d6e4b | 2017-06-09 11:09:03 -0400 | [diff] [blame] | 137 | SkShadowUtils::DrawShadow(canvas, path, zPlaneParams, |
| 138 | lightPos, lightWidth, |
Jim Van Verth | a556684 | 2018-02-22 10:58:34 -0500 | [diff] [blame] | 139 | SK_ColorTRANSPARENT, spotGreyscale, flags); |
Jim Van Verth | 34d6e4b | 2017-06-09 11:09:03 -0400 | [diff] [blame] | 140 | } else { |
Jim Van Verth | a556684 | 2018-02-22 10:58:34 -0500 | [diff] [blame] | 141 | SkColor color = paint.getColor(); |
| 142 | SkColor baseAmbient = SkColorSetARGB(ambientAlpha*SkColorGetA(color), |
| 143 | SkColorGetR(color), SkColorGetG(color), |
| 144 | SkColorGetB(color)); |
| 145 | SkColor baseSpot = SkColorSetARGB(spotAlpha*SkColorGetA(color), |
| 146 | SkColorGetR(color), SkColorGetG(color), |
| 147 | SkColorGetB(color)); |
| 148 | SkColor tonalAmbient, tonalSpot; |
| 149 | SkShadowUtils::ComputeTonalColors(baseAmbient, baseSpot, &tonalAmbient, &tonalSpot); |
Jim Van Verth | 34d6e4b | 2017-06-09 11:09:03 -0400 | [diff] [blame] | 150 | SkShadowUtils::DrawShadow(canvas, path, zPlaneParams, |
| 151 | lightPos, lightWidth, |
Jim Van Verth | a556684 | 2018-02-22 10:58:34 -0500 | [diff] [blame] | 152 | tonalAmbient, tonalSpot, flags); |
Jim Van Verth | 34d6e4b | 2017-06-09 11:09:03 -0400 | [diff] [blame] | 153 | } |
| 154 | if (fShowObject) { |
| 155 | canvas->drawPath(path, paint); |
| 156 | } else { |
| 157 | SkPaint strokePaint; |
| 158 | |
| 159 | strokePaint.setColor(paint.getColor()); |
| 160 | strokePaint.setStyle(SkPaint::kStroke_Style); |
| 161 | |
| 162 | canvas->drawPath(path, strokePaint); |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | void onDrawContent(SkCanvas* canvas) override { |
| 167 | const SkScalar kLightWidth = 600; |
| 168 | const SkScalar kAmbientAlpha = 0.03f; |
| 169 | const SkScalar kSpotAlpha = 0.25f; |
| 170 | |
| 171 | const SkScalar kZValues[10] = { 1, 2, 3, 4, 6, 8, 9, 12, 16, 24 }; |
| 172 | |
| 173 | const SkColor kColors[30] = { |
| 174 | // purples |
| 175 | 0xFF3A0072, 0xFF5D0099, 0xFF7F12B2, 0xFFA02AD1, 0xFFC245E5, |
| 176 | 0xFFE95AF9, 0xFFFC79F0, 0xFFFDA6F0, 0xFFFFCCF8, 0xFFFFE1F9, |
| 177 | // oranges |
| 178 | 0xFFEA3200, 0xFFFF4E00, 0xFFFF7300, 0xFFFF9100, 0xFFFFB000, |
| 179 | 0xFFFFCE00, 0xFFFFE000, 0xFFFFF64D, 0xFFFFF98F, 0xFFFFFBCC, |
| 180 | // teals |
| 181 | 0xFF004D51, 0xFF066266, 0xFF057F7F, 0xFF009999, 0xFF00B2B2, |
| 182 | 0xFF15CCBE, 0xFF25E5CE, 0xFF2CFFE0, 0xFF80FFEA, 0xFFB3FFF0 |
| 183 | }; |
| 184 | |
| 185 | SkPaint paint; |
| 186 | paint.setAntiAlias(true); |
| 187 | if (fDarkBackground) { |
| 188 | canvas->drawColor(0xFF111111); |
| 189 | paint.setColor(SK_ColorWHITE); |
| 190 | } else { |
| 191 | canvas->drawColor(0xFFEAEAEA); |
| 192 | paint.setColor(SK_ColorBLACK); |
| 193 | } |
| 194 | |
| 195 | if (fTwoPassColor) { |
| 196 | canvas->drawText("Two pass", 8, 10, 15, paint); |
| 197 | } else { |
| 198 | canvas->drawText("One pass", 8, 10, 15, paint); |
| 199 | } |
| 200 | |
| 201 | SkPoint3 lightPos = { 75, -400, 600 }; |
| 202 | SkPoint3 zPlaneParams = SkPoint3::Make(0, 0, kZValues[fZIndex]); |
| 203 | SkScalar yPos = 75; |
| 204 | |
| 205 | for (int row = 0; row < 3; ++row) { |
| 206 | lightPos.fX = 75; |
| 207 | SkScalar xPos = 75; |
| 208 | for (int col = 0; col < 10; ++col) { |
| 209 | paint.setColor(kColors[10*row + col]); |
| 210 | |
| 211 | canvas->save(); |
| 212 | canvas->translate(xPos, yPos); |
| 213 | this->drawShadowedPath(canvas, fRectPath, zPlaneParams, paint, kAmbientAlpha, |
| 214 | lightPos, kLightWidth, kSpotAlpha); |
| 215 | canvas->restore(); |
| 216 | |
| 217 | lightPos.fX += 120; |
| 218 | xPos += 120; |
| 219 | } |
| 220 | |
| 221 | lightPos.fY += 200; |
| 222 | yPos += 200; |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | private: |
Ben Wagner | b2c4ea6 | 2018-08-08 11:36:17 -0400 | [diff] [blame] | 227 | typedef Sample INHERITED; |
Jim Van Verth | 34d6e4b | 2017-06-09 11:09:03 -0400 | [diff] [blame] | 228 | }; |
| 229 | |
| 230 | ////////////////////////////////////////////////////////////////////////////// |
| 231 | |
Ben Wagner | b2c4ea6 | 2018-08-08 11:36:17 -0400 | [diff] [blame] | 232 | DEF_SAMPLE( return new ShadowColorView(); ) |