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| 1 /* |
| 2 * Copyright 2016 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 "gm.h" |
| 9 |
| 10 #include "SkBitmapProcShader.h" |
| 11 #include "SkLightingShader.h" |
| 12 #include "SkNormalSource.h" |
| 13 #include "SkPath.h" |
| 14 #include "SkPoint3.h" |
| 15 #include "SkShader.h" |
| 16 |
| 17 |
| 18 namespace skiagm { |
| 19 |
| 20 // This GM exercises lighting shaders when used with bevel SkNormalSource object
s. |
| 21 class LightingShaderBevelGM : public GM { |
| 22 public: |
| 23 LightingShaderBevelGM() { |
| 24 this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC)); |
| 25 } |
| 26 |
| 27 protected: |
| 28 SkString onShortName() override { |
| 29 return SkString("lightingshaderbevel"); |
| 30 } |
| 31 |
| 32 SkISize onISize() override { |
| 33 return SkISize::Make(SkScalarCeilToInt(GRID_NUM_COLUMNS * GRID_CELL_WIDT
H), |
| 34 SkScalarCeilToInt(GRID_NUM_ROWS * GRID_CELL_WIDT
H)); |
| 35 } |
| 36 |
| 37 void onOnceBeforeDraw() override { |
| 38 SkLights::Builder builder; |
| 39 const SkVector3 kLightFromUpperRight = SkVector3::Make(0.788f, 0.394f, 0
.473f); |
| 40 |
| 41 builder.add(SkLights::Light(SkColor3f::Make(1.0f, 1.0f, 1.0f), |
| 42 kLightFromUpperRight)); |
| 43 builder.add(SkLights::Light(SkColor3f::Make(0.2f, 0.2f, 0.2f))); |
| 44 fLights = builder.finish(); |
| 45 |
| 46 // fRect is assumed to be square throughout this file |
| 47 fRect = SkRect::MakeIWH(kTexSize, kTexSize); |
| 48 SkMatrix matrix; |
| 49 SkRect bitmapBounds = SkRect::MakeIWH(kTexSize, kTexSize); |
| 50 matrix.setRectToRect(bitmapBounds, fRect, SkMatrix::kFill_ScaleToFit); |
| 51 |
| 52 SkBitmap diffuseMap = sk_tool_utils::create_checkerboard_bitmap( |
| 53 kTexSize, kTexSize, |
| 54 sk_tool_utils::color_to_565(0x0), |
| 55 sk_tool_utils::color_to_565(0xFF804020), |
| 56 8); |
| 57 fDiffuse = SkMakeBitmapShader(diffuseMap, SkShader::kClamp_TileMode, |
| 58 SkShader::kClamp_TileMode, &matrix, nullpt
r); |
| 59 |
| 60 fConvexPath.moveTo(fRect.width() / 2.0f, 0.0f); |
| 61 fConvexPath.lineTo(0.0f, fRect.height()); |
| 62 fConvexPath.lineTo(fRect.width(), fRect.height()); |
| 63 fConvexPath.close(); |
| 64 |
| 65 // Creating concave path |
| 66 { |
| 67 SkScalar x = 0.0f; |
| 68 SkScalar y = fRect.height() / 2.0f; |
| 69 |
| 70 const int NUM_SPIKES = 8; |
| 71 |
| 72 const SkScalar x0 = x; |
| 73 const SkScalar dx = fRect.width() / (NUM_SPIKES * 2); |
| 74 const SkScalar dy = SK_Scalar1 * 10; |
| 75 |
| 76 |
| 77 fConcavePath.moveTo(x, y + dy); |
| 78 for (int i = 0; i < NUM_SPIKES; i++) { |
| 79 x += dx; |
| 80 fConcavePath.lineTo(x, y - dy); |
| 81 x += dx; |
| 82 fConcavePath.lineTo(x, y + dy); |
| 83 } |
| 84 fConcavePath.lineTo(x, y + (2 * dy)); |
| 85 fConcavePath.lineTo(x0, y + (2 * dy)); |
| 86 fConcavePath.close(); |
| 87 } |
| 88 } |
| 89 |
| 90 // Scales shape around origin, rotates shape around origin, then translates
shape to origin |
| 91 void positionCTM(SkCanvas *canvas, SkScalar scaleX, SkScalar scaleY, SkScala
r rotate) const { |
| 92 canvas->translate(kTexSize/2.0f, kTexSize/2.0f); |
| 93 canvas->scale(scaleX, scaleY); |
| 94 canvas->rotate(rotate); |
| 95 canvas->translate(-kTexSize/2.0f, -kTexSize/2.0f); |
| 96 } |
| 97 |
| 98 enum Shape { |
| 99 kCircle_Shape, |
| 100 kRect_Shape, |
| 101 kRRect_Shape, |
| 102 kConvexPath_Shape, |
| 103 kConcavePath_Shape, |
| 104 |
| 105 kLast_Shape = kConcavePath_Shape |
| 106 }; |
| 107 void drawShape(enum Shape shape, SkCanvas* canvas, SkScalar scaleX, SkScalar
scaleY, |
| 108 SkScalar rotate, SkNormalSource::BevelType bevelType, SkScala
r bevelHeight) { |
| 109 canvas->save(); |
| 110 |
| 111 this->positionCTM(canvas, scaleX, scaleY, rotate); |
| 112 |
| 113 SkPaint paint; |
| 114 |
| 115 SkScalar bevelWidth = 10.0f; |
| 116 sk_sp<SkNormalSource> normalSource = SkNormalSource::MakeBevel(bevelType
, bevelWidth, |
| 117 bevelHeig
ht); |
| 118 |
| 119 paint.setShader(SkLightingShader::Make(fDiffuse, std::move(normalSource)
, fLights)); |
| 120 paint.setAntiAlias(true); |
| 121 switch(shape) { |
| 122 case kCircle_Shape: |
| 123 canvas->drawCircle(fRect.centerX(), fRect.centerY(), fRect.width
()/2.0f, paint); |
| 124 break; |
| 125 case kRect_Shape: |
| 126 canvas->drawRect(fRect, paint); |
| 127 break; |
| 128 case kRRect_Shape: |
| 129 canvas->drawRoundRect(fRect, 5.0f, 5.0f, paint); |
| 130 break; |
| 131 case kConvexPath_Shape: |
| 132 canvas->drawPath(fConvexPath, paint); |
| 133 break; |
| 134 case kConcavePath_Shape: |
| 135 canvas->drawPath(fConcavePath, paint); |
| 136 break; |
| 137 default: |
| 138 SkDEBUGFAIL("Invalid shape enum for drawShape"); |
| 139 } |
| 140 |
| 141 canvas->restore(); |
| 142 } |
| 143 |
| 144 void onDraw(SkCanvas* canvas) override { |
| 145 SkPaint labelPaint; |
| 146 labelPaint.setTypeface(sk_tool_utils::create_portable_typeface("sans-ser
if", |
| 147 SkFontSty
le())); |
| 148 labelPaint.setAntiAlias(true); |
| 149 labelPaint.setTextSize(LABEL_SIZE); |
| 150 |
| 151 int gridNum = 0; |
| 152 |
| 153 // Running through all possible parameter combinations |
| 154 for (auto bevelType : {SkNormalSource::BevelType::kLinear, |
| 155 SkNormalSource::BevelType::kRoundedIn, |
| 156 SkNormalSource::BevelType::kRoundedOut}) { |
| 157 for (SkScalar bevelHeight: {-7.0f, 7.0f}) { |
| 158 for (int shapeInt = 0; shapeInt < NUM_SHAPES; shapeInt++) { |
| 159 Shape shape = (Shape)shapeInt; |
| 160 |
| 161 // Determining position |
| 162 SkScalar xPos = (gridNum / GRID_NUM_ROWS) * GRID_CELL_WIDTH; |
| 163 SkScalar yPos = (gridNum % GRID_NUM_ROWS) * GRID_CELL_WIDTH; |
| 164 |
| 165 canvas->save(); |
| 166 |
| 167 canvas->translate(xPos, yPos); |
| 168 this->drawShape(shape, canvas, 1.0f, 1.0f, 0.f, bevelType, b
evelHeight); |
| 169 // Drawing labels |
| 170 canvas->translate(0.0f, SkIntToScalar(kTexSize)); |
| 171 { |
| 172 canvas->translate(0.0f, LABEL_SIZE); |
| 173 SkString label; |
| 174 label.append("bevelType: "); |
| 175 switch (bevelType) { |
| 176 case SkNormalSource::BevelType::kLinear: |
| 177 label.append("linear"); |
| 178 break; |
| 179 case SkNormalSource::BevelType::kRoundedIn: |
| 180 label.append("roundedIn"); |
| 181 break; |
| 182 case SkNormalSource::BevelType::kRoundedOut: |
| 183 label.append("roundedOut"); |
| 184 break; |
| 185 } |
| 186 canvas->drawText(label.c_str(), label.size(), 0.0f, 0.0f
, labelPaint); |
| 187 } |
| 188 { |
| 189 canvas->translate(0.0f, LABEL_SIZE); |
| 190 SkString label; |
| 191 label.appendf("bevelHeight: %.1f", bevelHeight); |
| 192 canvas->drawText(label.c_str(), label.size(), 0.0f, 0.0f
, labelPaint); |
| 193 } |
| 194 |
| 195 canvas->restore(); |
| 196 |
| 197 gridNum++; |
| 198 } |
| 199 } |
| 200 } |
| 201 |
| 202 // Testing rotation |
| 203 for (int shapeInt = 0; shapeInt < NUM_SHAPES; shapeInt++) { |
| 204 Shape shape = (Shape)shapeInt; |
| 205 |
| 206 // Determining position |
| 207 SkScalar xPos = (gridNum / GRID_NUM_ROWS) * GRID_CELL_WIDTH; |
| 208 SkScalar yPos = (gridNum % GRID_NUM_ROWS) * GRID_CELL_WIDTH; |
| 209 |
| 210 canvas->save(); |
| 211 |
| 212 canvas->translate(xPos, yPos); |
| 213 this->drawShape(shape, canvas, SK_ScalarRoot2Over2, SK_ScalarRoot2Ov
er2, 45.0f, |
| 214 SkNormalSource::BevelType::kLinear, 7.0f); |
| 215 |
| 216 // Drawing labels |
| 217 canvas->translate(0.0f, SkIntToScalar(kTexSize)); |
| 218 { |
| 219 canvas->translate(0.0f, LABEL_SIZE); |
| 220 SkString label; |
| 221 label.appendf("bevelType: linear"); |
| 222 canvas->drawText(label.c_str(), label.size(), 0.0f, 0.0f, labelP
aint); |
| 223 } |
| 224 { |
| 225 canvas->translate(0.0f, LABEL_SIZE); |
| 226 SkString label; |
| 227 label.appendf("bevelHeight: %.1f", 7.0f); |
| 228 canvas->drawText(label.c_str(), label.size(), 0.0f, 0.0f, labelP
aint); |
| 229 } |
| 230 { |
| 231 canvas->translate(0.0f, LABEL_SIZE); |
| 232 SkString label; |
| 233 label.appendf("rotated"); |
| 234 canvas->drawText(label.c_str(), label.size(), 0.0f, 0.0f, labelP
aint); |
| 235 } |
| 236 |
| 237 canvas->restore(); |
| 238 |
| 239 gridNum++; |
| 240 } |
| 241 |
| 242 // Making sure NUM_COMBINATIONS_PER_SHAPE is set correctly |
| 243 SkASSERT(gridNum == (NUM_COMBINATIONS_PER_SHAPE*NUM_SHAPES)); |
| 244 } |
| 245 |
| 246 private: |
| 247 static constexpr int kTexSize = 96; |
| 248 static constexpr int NUM_SHAPES = kLast_Shape + 1; |
| 249 static constexpr int NUM_COMBINATIONS_PER_SHAPE = 7; |
| 250 static constexpr int GRID_NUM_ROWS = NUM_SHAPES; |
| 251 static constexpr int GRID_NUM_COLUMNS = NUM_COMBINATIONS_PER_SHAPE; |
| 252 static constexpr SkScalar LABEL_SIZE = 10.0f; |
| 253 static constexpr int NUM_LABELS_PER_CELL = 3; |
| 254 static constexpr SkScalar GRID_CELL_WIDTH = kTexSize + 10.0f + NUM_LABELS_PE
R_CELL * LABEL_SIZE; |
| 255 |
| 256 sk_sp<SkShader> fDiffuse; |
| 257 |
| 258 SkRect fRect; |
| 259 SkPath fConvexPath; |
| 260 SkPath fConcavePath; |
| 261 sk_sp<SkLights> fLights; |
| 262 |
| 263 typedef GM INHERITED; |
| 264 }; |
| 265 |
| 266 ////////////////////////////////////////////////////////////////////////////// |
| 267 |
| 268 DEF_GM(return new LightingShaderBevelGM;) |
| 269 } |
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