jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 1 | |
| 2 | /* |
| 3 | * Copyright 2016 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 "SkBlurMask.h" |
| 10 | #include "SkBlurMaskFilter.h" |
| 11 | #include "SkCanvas.h" |
jvanverth | 6c177a1 | 2016-08-17 07:59:41 -0700 | [diff] [blame] | 12 | #include "SkGaussianEdgeShader.h" |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 13 | #include "SkPath.h" |
| 14 | #include "SkPoint3.h" |
Jim Van Verth | 43475ad | 2017-01-13 14:37:37 -0500 | [diff] [blame] | 15 | #include "SkShadowUtils.h" |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 16 | #include "SkUtils.h" |
| 17 | #include "SkView.h" |
| 18 | #include "sk_tool_utils.h" |
| 19 | |
Jim Van Verth | 43475ad | 2017-01-13 14:37:37 -0500 | [diff] [blame] | 20 | #define USE_SHADOW_UTILS |
| 21 | |
jvanverth | 6c177a1 | 2016-08-17 07:59:41 -0700 | [diff] [blame] | 22 | //////////////////////////////////////////////////////////////////////////// |
| 23 | |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 24 | class ShadowsView : public SampleView { |
| 25 | SkPath fRectPath; |
| 26 | SkPath fRRPath; |
| 27 | SkPath fCirclePath; |
| 28 | SkPoint3 fLightPos; |
| 29 | |
| 30 | bool fShowAmbient; |
| 31 | bool fShowSpot; |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 32 | bool fUseAlt; |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 33 | bool fShowObject; |
Robert Phillips | 95304e3 | 2016-10-07 14:44:07 -0400 | [diff] [blame] | 34 | bool fIgnoreShadowAlpha; |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 35 | |
| 36 | public: |
| 37 | ShadowsView() |
| 38 | : fShowAmbient(true) |
| 39 | , fShowSpot(true) |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 40 | , fUseAlt(true) |
Robert Phillips | 95304e3 | 2016-10-07 14:44:07 -0400 | [diff] [blame] | 41 | , fShowObject(true) |
| 42 | , fIgnoreShadowAlpha(false) {} |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 43 | |
| 44 | protected: |
| 45 | void onOnceBeforeDraw() override { |
| 46 | fCirclePath.addCircle(0, 0, 50); |
| 47 | fRectPath.addRect(SkRect::MakeXYWH(-100, -50, 200, 100)); |
| 48 | fRRPath.addRRect(SkRRect::MakeRectXY(SkRect::MakeXYWH(-100, -50, 200, 100), 4, 4)); |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 49 | fLightPos = SkPoint3::Make(-700, -700, 2800); |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | // overrides from SkEventSink |
| 53 | bool onQuery(SkEvent* evt) override { |
| 54 | if (SampleCode::TitleQ(*evt)) { |
| 55 | SampleCode::TitleR(evt, "AndroidShadows"); |
| 56 | return true; |
| 57 | } |
| 58 | |
| 59 | SkUnichar uni; |
| 60 | if (SampleCode::CharQ(*evt, &uni)) { |
| 61 | switch (uni) { |
| 62 | case 'B': |
| 63 | fShowAmbient = !fShowAmbient; |
| 64 | break; |
| 65 | case 'S': |
| 66 | fShowSpot = !fShowSpot; |
| 67 | break; |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 68 | case 'T': |
| 69 | fUseAlt = !fUseAlt; |
| 70 | break; |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 71 | case 'O': |
| 72 | fShowObject = !fShowObject; |
| 73 | break; |
| 74 | case '>': |
| 75 | fLightPos.fZ += 10; |
| 76 | break; |
| 77 | case '<': |
| 78 | fLightPos.fZ -= 10; |
| 79 | break; |
Robert Phillips | 95304e3 | 2016-10-07 14:44:07 -0400 | [diff] [blame] | 80 | case '?': |
| 81 | fIgnoreShadowAlpha = !fIgnoreShadowAlpha; |
| 82 | break; |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 83 | default: |
| 84 | break; |
| 85 | } |
| 86 | this->inval(nullptr); |
| 87 | } |
| 88 | return this->INHERITED::onQuery(evt); |
| 89 | } |
| 90 | |
| 91 | void drawBG(SkCanvas* canvas) { |
| 92 | canvas->drawColor(0xFFDDDDDD); |
| 93 | } |
| 94 | |
| 95 | static void GetOcclRect(const SkPath& path, SkRect* occlRect) { |
| 96 | SkRect pathRect; |
| 97 | SkRRect pathRRect; |
| 98 | if (path.isOval(&pathRect)) { |
| 99 | *occlRect = sk_tool_utils::compute_central_occluder(SkRRect::MakeOval(pathRect)); |
| 100 | } else if (path.isRRect(&pathRRect)) { |
| 101 | *occlRect = sk_tool_utils::compute_central_occluder(pathRRect); |
| 102 | } else if (path.isRect(occlRect)) { |
| 103 | // the inverse transform for the spot shadow occluder doesn't always get us |
| 104 | // back to exactly the same position, so deducting a little slop |
| 105 | occlRect->inset(1, 1); |
| 106 | } else { |
| 107 | *occlRect = SkRect::MakeEmpty(); |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | void drawAmbientShadow(SkCanvas* canvas, const SkPath& path, SkScalar zValue, |
| 112 | SkScalar ambientAlpha) { |
| 113 | |
| 114 | if (ambientAlpha <= 0) { |
| 115 | return; |
| 116 | } |
| 117 | |
| 118 | const SkScalar kHeightFactor = 1.f / 128.f; |
| 119 | const SkScalar kGeomFactor = 64; |
| 120 | |
| 121 | SkScalar umbraAlpha = 1 / (1 + SkMaxScalar(zValue*kHeightFactor, 0)); |
| 122 | SkScalar radius = zValue*kHeightFactor*kGeomFactor; |
| 123 | |
| 124 | // occlude blur |
| 125 | SkRect occlRect; |
| 126 | GetOcclRect(path, &occlRect); |
| 127 | sk_sp<SkMaskFilter> mf = SkBlurMaskFilter::Make(kNormal_SkBlurStyle, |
| 128 | SkBlurMask::ConvertRadiusToSigma(radius), |
| 129 | occlRect, |
| 130 | SkBlurMaskFilter::kNone_BlurFlag); |
| 131 | |
| 132 | SkPaint paint; |
| 133 | paint.setAntiAlias(true); |
| 134 | paint.setMaskFilter(std::move(mf)); |
Robert Phillips | 95304e3 | 2016-10-07 14:44:07 -0400 | [diff] [blame] | 135 | paint.setColor(SkColorSetARGB(fIgnoreShadowAlpha |
| 136 | ? 255 |
| 137 | : (unsigned char)(ambientAlpha*umbraAlpha*255.999f), 0, 0, 0)); |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 138 | canvas->drawPath(path, paint); |
| 139 | |
| 140 | // draw occlusion rect |
jvanverth | 6c177a1 | 2016-08-17 07:59:41 -0700 | [diff] [blame] | 141 | #if DRAW_OCCL_RECT |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 142 | SkPaint stroke; |
| 143 | stroke.setStyle(SkPaint::kStroke_Style); |
| 144 | stroke.setColor(SK_ColorBLUE); |
| 145 | canvas->drawRect(occlRect, stroke); |
jvanverth | 6c177a1 | 2016-08-17 07:59:41 -0700 | [diff] [blame] | 146 | #endif |
| 147 | } |
| 148 | |
| 149 | void drawAmbientShadowAlt(SkCanvas* canvas, const SkPath& path, SkScalar zValue, |
| 150 | SkScalar ambientAlpha) { |
| 151 | |
| 152 | if (ambientAlpha <= 0) { |
| 153 | return; |
| 154 | } |
| 155 | |
| 156 | const SkScalar kHeightFactor = 1.f / 128.f; |
| 157 | const SkScalar kGeomFactor = 64; |
| 158 | |
| 159 | SkScalar umbraAlpha = 1 / (1 + SkMaxScalar(zValue*kHeightFactor, 0)); |
| 160 | SkScalar radius = zValue*kHeightFactor*kGeomFactor; |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 161 | // distance to outer of edge of geometry from original shape edge |
| 162 | SkScalar offset = radius*umbraAlpha; |
jvanverth | 6c177a1 | 2016-08-17 07:59:41 -0700 | [diff] [blame] | 163 | |
jvanverth | a4f1af8 | 2016-08-29 07:17:47 -0700 | [diff] [blame] | 164 | SkRect pathRect; |
| 165 | SkRRect pathRRect; |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 166 | SkScalar scaleFactors[2]; |
| 167 | if (!canvas->getTotalMatrix().getMinMaxScales(scaleFactors)) { |
| 168 | return; |
| 169 | } |
| 170 | if (scaleFactors[0] != scaleFactors[1] || radius*scaleFactors[0] >= 64 || |
jvanverth | a4f1af8 | 2016-08-29 07:17:47 -0700 | [diff] [blame] | 171 | !((path.isOval(&pathRect) && pathRect.width() == pathRect.height()) || |
| 172 | (path.isRRect(&pathRRect) && pathRRect.allCornersCircular()) || |
| 173 | path.isRect(&pathRect))) { |
| 174 | this->drawAmbientShadow(canvas, path, zValue, ambientAlpha); |
| 175 | return; |
| 176 | } |
| 177 | |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 178 | // For all of these, we inset the offset rect by half the radius to get our stroke shape. |
| 179 | SkScalar strokeOutset = offset - SK_ScalarHalf*radius; |
| 180 | // Make sure we'll have a radius of at least 0.5 after xform |
| 181 | if (strokeOutset*scaleFactors[0] < 0.5f) { |
| 182 | strokeOutset = 0.5f / scaleFactors[0]; |
| 183 | } |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 184 | if (path.isOval(nullptr)) { |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 185 | pathRect.outset(strokeOutset, strokeOutset); |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 186 | pathRRect = SkRRect::MakeOval(pathRect); |
| 187 | } else if (path.isRect(nullptr)) { |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 188 | pathRect.outset(strokeOutset, strokeOutset); |
| 189 | pathRRect = SkRRect::MakeRectXY(pathRect, strokeOutset, strokeOutset); |
jvanverth | 6c177a1 | 2016-08-17 07:59:41 -0700 | [diff] [blame] | 190 | } else { |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 191 | pathRRect.outset(strokeOutset, strokeOutset); |
jvanverth | 6c177a1 | 2016-08-17 07:59:41 -0700 | [diff] [blame] | 192 | } |
| 193 | |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 194 | SkPaint paint; |
| 195 | paint.setAntiAlias(true); |
jvanverth | a4f1af8 | 2016-08-29 07:17:47 -0700 | [diff] [blame] | 196 | paint.setStyle(SkPaint::kStroke_Style); |
| 197 | // we outset the stroke a little to cover up AA on the interior edge |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 198 | SkScalar pad = 0.5f; |
| 199 | paint.setStrokeWidth(radius + 2*pad); |
| 200 | // handle scale of radius and pad due to CTM |
| 201 | radius *= scaleFactors[0]; |
| 202 | pad *= scaleFactors[0]; |
| 203 | SkASSERT(radius < 16384); |
| 204 | SkASSERT(pad < 64); |
| 205 | // Convert radius to 14.2 fixed point and place in the R & G components. |
| 206 | // Convert pad to 6.2 fixed point and place in the B component. |
| 207 | uint16_t iRadius = (uint16_t)(radius*4.0f); |
| 208 | unsigned char alpha = (unsigned char)(ambientAlpha*255.999f); |
Robert Phillips | 95304e3 | 2016-10-07 14:44:07 -0400 | [diff] [blame] | 209 | paint.setColor(SkColorSetARGB(fIgnoreShadowAlpha ? 255 : alpha, |
| 210 | iRadius >> 8, iRadius & 0xff, |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 211 | (unsigned char)(4.0f*pad))); |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 212 | |
jvanverth | c20c0c0 | 2016-09-14 07:04:49 -0700 | [diff] [blame] | 213 | paint.setShader(SkGaussianEdgeShader::Make()); |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 214 | canvas->drawRRect(pathRRect, paint); |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 215 | } |
| 216 | |
| 217 | void drawSpotShadow(SkCanvas* canvas, const SkPath& path, SkScalar zValue, |
| 218 | SkPoint3 lightPos, SkScalar lightWidth, SkScalar spotAlpha) { |
| 219 | if (spotAlpha <= 0) { |
| 220 | return; |
| 221 | } |
| 222 | |
| 223 | SkScalar zRatio = zValue / (lightPos.fZ - zValue); |
| 224 | if (zRatio < 0.0f) { |
| 225 | zRatio = 0.0f; |
| 226 | } else if (zRatio > 0.95f) { |
| 227 | zRatio = 0.95f; |
| 228 | } |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 229 | SkScalar blurRadius = lightWidth*zRatio; |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 230 | |
| 231 | // compute the transformation params |
| 232 | SkPoint center = SkPoint::Make(path.getBounds().centerX(), path.getBounds().centerY()); |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 233 | SkMatrix ctmInverse; |
| 234 | if (!canvas->getTotalMatrix().invert(&ctmInverse)) { |
| 235 | return; |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 236 | } |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 237 | SkPoint lightPos2D = SkPoint::Make(lightPos.fX, lightPos.fY); |
| 238 | ctmInverse.mapPoints(&lightPos2D, 1); |
| 239 | SkPoint offset = SkPoint::Make(zRatio*(center.fX - lightPos2D.fX), |
| 240 | zRatio*(center.fY - lightPos2D.fY)); |
| 241 | SkScalar scale = lightPos.fZ / (lightPos.fZ - zValue); |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 242 | |
| 243 | SkAutoCanvasRestore acr(canvas, true); |
| 244 | |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 245 | sk_sp<SkMaskFilter> mf = SkBlurMaskFilter::Make(kNormal_SkBlurStyle, |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 246 | SkBlurMask::ConvertRadiusToSigma(blurRadius), |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 247 | SkBlurMaskFilter::kNone_BlurFlag); |
| 248 | |
| 249 | SkPaint paint; |
| 250 | paint.setAntiAlias(true); |
| 251 | paint.setMaskFilter(std::move(mf)); |
Robert Phillips | 95304e3 | 2016-10-07 14:44:07 -0400 | [diff] [blame] | 252 | paint.setColor(SkColorSetARGB(fIgnoreShadowAlpha |
| 253 | ? 255 |
| 254 | : (unsigned char)(spotAlpha*255.999f), 0, 0, 0)); |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 255 | |
| 256 | // apply transformation to shadow |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 257 | canvas->scale(scale, scale); |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 258 | canvas->translate(offset.fX, offset.fY); |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 259 | canvas->drawPath(path, paint); |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 260 | } |
| 261 | |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 262 | void drawSpotShadowAlt(SkCanvas* canvas, const SkPath& path, SkScalar zValue, |
| 263 | SkPoint3 lightPos, SkScalar lightWidth, SkScalar spotAlpha) { |
| 264 | if (spotAlpha <= 0) { |
| 265 | return; |
| 266 | } |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 267 | |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 268 | SkScalar zRatio = zValue / (lightPos.fZ - zValue); |
| 269 | if (zRatio < 0.0f) { |
| 270 | zRatio = 0.0f; |
| 271 | } else if (zRatio > 0.95f) { |
| 272 | zRatio = 0.95f; |
| 273 | } |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 274 | SkScalar radius = 2.0f*lightWidth*zRatio; |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 275 | |
jvanverth | a4f1af8 | 2016-08-29 07:17:47 -0700 | [diff] [blame] | 276 | SkRect pathRect; |
| 277 | SkRRect pathRRect; |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 278 | SkScalar scaleFactors[2]; |
| 279 | if (!canvas->getTotalMatrix().getMinMaxScales(scaleFactors)) { |
| 280 | return; |
| 281 | } |
| 282 | if (scaleFactors[0] != scaleFactors[1] || radius*scaleFactors[0] >= 16384 || |
jvanverth | a4f1af8 | 2016-08-29 07:17:47 -0700 | [diff] [blame] | 283 | !((path.isOval(&pathRect) && pathRect.width() == pathRect.height()) || |
| 284 | (path.isRRect(&pathRRect) && pathRRect.allCornersCircular()) || |
| 285 | path.isRect(&pathRect))) { |
| 286 | this->drawSpotShadow(canvas, path, zValue, lightPos, lightWidth, spotAlpha); |
| 287 | return; |
| 288 | } |
| 289 | |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 290 | // For all of these, we need to ensure we have a rrect with radius >= 0.5f in device space |
Robert Phillips | 95304e3 | 2016-10-07 14:44:07 -0400 | [diff] [blame] | 291 | const SkScalar minRadius = SK_ScalarHalf/scaleFactors[0]; |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 292 | if (path.isOval(nullptr)) { |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 293 | pathRRect = SkRRect::MakeOval(pathRect); |
| 294 | } else if (path.isRect(nullptr)) { |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 295 | pathRRect = SkRRect::MakeRectXY(pathRect, minRadius, minRadius); |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 296 | } else { |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 297 | if (pathRRect.getSimpleRadii().fX < minRadius) { |
| 298 | pathRRect.setRectXY(pathRRect.rect(), minRadius, minRadius); |
| 299 | } |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 300 | } |
| 301 | |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 302 | // compute the scale and translation for the shadow |
| 303 | SkScalar scale = lightPos.fZ / (lightPos.fZ - zValue); |
| 304 | SkRRect shadowRRect; |
| 305 | pathRRect.transform(SkMatrix::MakeScale(scale, scale), &shadowRRect); |
| 306 | SkPoint center = SkPoint::Make(shadowRRect.rect().centerX(), shadowRRect.rect().centerY()); |
| 307 | SkMatrix ctmInverse; |
| 308 | if (!canvas->getTotalMatrix().invert(&ctmInverse)) { |
| 309 | return; |
| 310 | } |
| 311 | SkPoint lightPos2D = SkPoint::Make(lightPos.fX, lightPos.fY); |
| 312 | ctmInverse.mapPoints(&lightPos2D, 1); |
| 313 | SkPoint offset = SkPoint::Make(zRatio*(center.fX - lightPos2D.fX), |
| 314 | zRatio*(center.fY - lightPos2D.fY)); |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 315 | SkAutoCanvasRestore acr(canvas, true); |
| 316 | |
| 317 | SkPaint paint; |
| 318 | paint.setAntiAlias(true); |
Robert Phillips | 95304e3 | 2016-10-07 14:44:07 -0400 | [diff] [blame] | 319 | // We want to extend the stroked area in so that it meets up with the caster |
| 320 | // geometry. The stroked geometry will, by definition already be inset half the |
| 321 | // stroke width but we also have to account for the scaling. |
| 322 | // We also add 1/2 to cover up AA on the interior edge. |
| 323 | SkScalar scaleOffset = (scale - 1.0f) * SkTMax(SkTMax(SkTAbs(pathRect.fLeft), |
| 324 | SkTAbs(pathRect.fRight)), |
| 325 | SkTMax(SkTAbs(pathRect.fTop), |
| 326 | SkTAbs(pathRect.fBottom))); |
| 327 | SkScalar insetAmount = offset.length() - (0.5f * radius) + scaleOffset + 0.5f; |
| 328 | |
jvanverth | a4f1af8 | 2016-08-29 07:17:47 -0700 | [diff] [blame] | 329 | // compute area |
Robert Phillips | 95304e3 | 2016-10-07 14:44:07 -0400 | [diff] [blame] | 330 | SkScalar strokeWidth = radius + insetAmount; |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 331 | SkScalar strokedArea = 2.0f*strokeWidth*(shadowRRect.width() + shadowRRect.height()); |
| 332 | SkScalar filledArea = (shadowRRect.height() + radius)*(shadowRRect.width() + radius); |
jvanverth | a4f1af8 | 2016-08-29 07:17:47 -0700 | [diff] [blame] | 333 | // If the area of the stroked geometry is larger than the fill geometry, or |
| 334 | // if our pad is too big to convert to 6.2 fixed point, just fill it. |
Robert Phillips | 95304e3 | 2016-10-07 14:44:07 -0400 | [diff] [blame] | 335 | if (strokedArea > filledArea) { |
jvanverth | a4f1af8 | 2016-08-29 07:17:47 -0700 | [diff] [blame] | 336 | paint.setStyle(SkPaint::kStrokeAndFill_Style); |
| 337 | paint.setStrokeWidth(radius); |
| 338 | } else { |
Robert Phillips | 95304e3 | 2016-10-07 14:44:07 -0400 | [diff] [blame] | 339 | // Since we can't have unequal strokes, inset the shadow rect so the inner |
| 340 | // and outer edges of the stroke will land where we want. |
| 341 | SkRect insetRect = shadowRRect.rect().makeInset(insetAmount/2.0f, insetAmount/2.0f); |
| 342 | SkScalar insetRad = SkTMax(shadowRRect.getSimpleRadii().fX - insetAmount/2.0f, |
| 343 | minRadius); |
| 344 | |
| 345 | shadowRRect = SkRRect::MakeRectXY(insetRect, insetRad, insetRad); |
jvanverth | a4f1af8 | 2016-08-29 07:17:47 -0700 | [diff] [blame] | 346 | paint.setStyle(SkPaint::kStroke_Style); |
| 347 | paint.setStrokeWidth(strokeWidth); |
| 348 | } |
jvanverth | c20c0c0 | 2016-09-14 07:04:49 -0700 | [diff] [blame] | 349 | paint.setShader(SkGaussianEdgeShader::Make()); |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 350 | // handle scale of radius due to CTM |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 351 | radius *= scaleFactors[0]; |
| 352 | // don't need to scale pad as it was computed from the transformed offset |
| 353 | SkASSERT(radius < 16384); |
Robert Phillips | 95304e3 | 2016-10-07 14:44:07 -0400 | [diff] [blame] | 354 | SkScalar pad = 0; |
jvanverth | a4f1af8 | 2016-08-29 07:17:47 -0700 | [diff] [blame] | 355 | SkASSERT(pad < 64); |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 356 | // Convert radius to 14.2 fixed point and place in the R & G components. |
| 357 | // Convert pad to 6.2 fixed point and place in the B component. |
| 358 | uint16_t iRadius = (uint16_t)(radius*4.0f); |
| 359 | unsigned char alpha = (unsigned char)(spotAlpha*255.999f); |
Robert Phillips | 95304e3 | 2016-10-07 14:44:07 -0400 | [diff] [blame] | 360 | paint.setColor(SkColorSetARGB(fIgnoreShadowAlpha ? 255 : alpha, |
| 361 | iRadius >> 8, iRadius & 0xff, |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 362 | (unsigned char)(4.0f*pad))); |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 363 | |
| 364 | // apply transformation to shadow |
| 365 | canvas->translate(offset.fX, offset.fY); |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 366 | canvas->drawRRect(shadowRRect, paint); |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 367 | } |
| 368 | |
| 369 | void drawShadowedPath(SkCanvas* canvas, const SkPath& path, SkScalar zValue, |
| 370 | const SkPaint& paint, SkScalar ambientAlpha, |
| 371 | const SkPoint3& lightPos, SkScalar lightWidth, SkScalar spotAlpha) { |
Jim Van Verth | 43475ad | 2017-01-13 14:37:37 -0500 | [diff] [blame] | 372 | #ifdef USE_SHADOW_UTILS |
Jim Van Verth | 3c1b7db | 2016-10-31 16:06:51 -0400 | [diff] [blame] | 373 | if (fUseAlt) { |
| 374 | if (fShowAmbient) { |
| 375 | this->drawAmbientShadowAlt(canvas, path, zValue, ambientAlpha); |
| 376 | } |
| 377 | if (fShowSpot) { |
| 378 | this->drawSpotShadowAlt(canvas, path, zValue, lightPos, lightWidth, spotAlpha); |
| 379 | } |
| 380 | } else { |
Jim Van Verth | 3c1b7db | 2016-10-31 16:06:51 -0400 | [diff] [blame] | 381 | if (!fShowAmbient) { |
| 382 | ambientAlpha = 0; |
| 383 | } |
| 384 | if (!fShowSpot) { |
| 385 | spotAlpha = 0; |
| 386 | } |
Jim Van Verth | 43475ad | 2017-01-13 14:37:37 -0500 | [diff] [blame] | 387 | SkShadowUtils::DrawShadow(canvas, path, zValue, lightPos, lightWidth, |
| 388 | ambientAlpha, spotAlpha, SK_ColorBLACK); |
Jim Van Verth | 3c1b7db | 2016-10-31 16:06:51 -0400 | [diff] [blame] | 389 | } |
| 390 | #else |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 391 | if (fShowAmbient) { |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 392 | if (fUseAlt) { |
| 393 | this->drawAmbientShadowAlt(canvas, path, zValue, ambientAlpha); |
jvanverth | 6c177a1 | 2016-08-17 07:59:41 -0700 | [diff] [blame] | 394 | } else { |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 395 | this->drawAmbientShadow(canvas, path, zValue, ambientAlpha); |
jvanverth | 6c177a1 | 2016-08-17 07:59:41 -0700 | [diff] [blame] | 396 | } |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 397 | } |
| 398 | if (fShowSpot) { |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 399 | if (fUseAlt) { |
| 400 | this->drawSpotShadowAlt(canvas, path, zValue, lightPos, lightWidth, spotAlpha); |
| 401 | } else { |
| 402 | this->drawSpotShadow(canvas, path, zValue, lightPos, lightWidth, spotAlpha); |
| 403 | } |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 404 | } |
Jim Van Verth | 3c1b7db | 2016-10-31 16:06:51 -0400 | [diff] [blame] | 405 | #endif |
| 406 | |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 407 | if (fShowObject) { |
| 408 | canvas->drawPath(path, paint); |
Robert Phillips | 95304e3 | 2016-10-07 14:44:07 -0400 | [diff] [blame] | 409 | } else { |
| 410 | SkPaint strokePaint; |
| 411 | |
| 412 | strokePaint.setColor(paint.getColor()); |
| 413 | strokePaint.setStyle(SkPaint::kStroke_Style); |
| 414 | |
| 415 | canvas->drawPath(path, strokePaint); |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 416 | } |
| 417 | } |
| 418 | |
| 419 | void onDrawContent(SkCanvas* canvas) override { |
| 420 | this->drawBG(canvas); |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 421 | const SkScalar kLightWidth = 2800; |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 422 | const SkScalar kAmbientAlpha = 0.25f; |
| 423 | const SkScalar kSpotAlpha = 0.25f; |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 424 | |
| 425 | SkPaint paint; |
| 426 | paint.setAntiAlias(true); |
| 427 | |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 428 | SkPoint3 lightPos = fLightPos; |
| 429 | |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 430 | paint.setColor(SK_ColorWHITE); |
| 431 | canvas->translate(200, 90); |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 432 | lightPos.fX += 200; |
| 433 | lightPos.fY += 90; |
Jim Van Verth | c590341 | 2016-11-17 15:27:09 -0500 | [diff] [blame] | 434 | this->drawShadowedPath(canvas, fRectPath, 2, paint, kAmbientAlpha, |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 435 | lightPos, kLightWidth, kSpotAlpha); |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 436 | |
| 437 | paint.setColor(SK_ColorRED); |
| 438 | canvas->translate(250, 0); |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 439 | lightPos.fX += 250; |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 440 | this->drawShadowedPath(canvas, fRRPath, 4, paint, kAmbientAlpha, |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 441 | lightPos, kLightWidth, kSpotAlpha); |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 442 | |
| 443 | paint.setColor(SK_ColorBLUE); |
| 444 | canvas->translate(-250, 110); |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 445 | lightPos.fX -= 250; |
| 446 | lightPos.fY += 110; |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 447 | this->drawShadowedPath(canvas, fCirclePath, 8, paint, 0.0f, |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 448 | lightPos, kLightWidth, 0.5f); |
jvanverth | 6c177a1 | 2016-08-17 07:59:41 -0700 | [diff] [blame] | 449 | |
| 450 | paint.setColor(SK_ColorGREEN); |
| 451 | canvas->translate(250, 0); |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 452 | lightPos.fX += 250; |
jvanverth | d99858a | 2016-09-12 07:51:04 -0700 | [diff] [blame] | 453 | this->drawShadowedPath(canvas, fRRPath, 64, paint, kAmbientAlpha, |
jvanverth | d7315f91 | 2016-08-17 10:06:18 -0700 | [diff] [blame] | 454 | lightPos, kLightWidth, kSpotAlpha); |
jvanverth | e1a3bc6 | 2016-08-12 10:40:38 -0700 | [diff] [blame] | 455 | } |
| 456 | |
| 457 | protected: |
| 458 | SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override { |
| 459 | return new SkView::Click(this); |
| 460 | } |
| 461 | |
| 462 | bool onClick(Click *click) override { |
| 463 | SkScalar x = click->fCurr.fX; |
| 464 | SkScalar y = click->fCurr.fY; |
| 465 | |
| 466 | SkScalar dx = x - click->fPrev.fX; |
| 467 | SkScalar dy = y - click->fPrev.fY; |
| 468 | |
| 469 | if (dx != 0 || dy != 0) { |
| 470 | fLightPos.fX += dx; |
| 471 | fLightPos.fY += dy; |
| 472 | this->inval(nullptr); |
| 473 | } |
| 474 | |
| 475 | return true; |
| 476 | } |
| 477 | |
| 478 | private: |
| 479 | typedef SkView INHERITED; |
| 480 | }; |
| 481 | |
| 482 | ////////////////////////////////////////////////////////////////////////////// |
| 483 | |
| 484 | static SkView* MyFactory() { return new ShadowsView; } |
| 485 | static SkViewRegister reg(MyFactory); |