halcanary | 8b2bc25 | 2015-10-06 09:41:47 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 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 "SkPath.h" |
| 9 | #include "SkStream.h" |
| 10 | #include "gm.h" |
| 11 | |
caryclark | 1f17ab5 | 2015-12-16 08:53:41 -0800 | [diff] [blame] | 12 | |
halcanary | 8b2bc25 | 2015-10-06 09:41:47 -0700 | [diff] [blame] | 13 | // Test how short paths are stroked with various caps |
caryclark | 1f17ab5 | 2015-12-16 08:53:41 -0800 | [diff] [blame] | 14 | class StrokeZeroGM : public skiagm::GM { |
| 15 | SkPath fPaths[8]; |
| 16 | SkPath fClipL, fClipR, fClipS; |
halcanary | 8b2bc25 | 2015-10-06 09:41:47 -0700 | [diff] [blame] | 17 | |
caryclark | 1f17ab5 | 2015-12-16 08:53:41 -0800 | [diff] [blame] | 18 | protected: |
| 19 | void onOnceBeforeDraw() override { |
| 20 | fClipL.moveTo(0, 0); |
| 21 | fClipL.lineTo(3, 0); |
| 22 | fClipL.lineTo(2.5f, 1); |
| 23 | fClipL.lineTo(3.5f, 2.5f); |
| 24 | fClipL.lineTo(2.5f, 4); |
| 25 | fClipL.lineTo(3, 5); |
| 26 | fClipL.lineTo(0, 5); |
| 27 | fClipL.close(); |
halcanary | 8b2bc25 | 2015-10-06 09:41:47 -0700 | [diff] [blame] | 28 | |
caryclark | 1f17ab5 | 2015-12-16 08:53:41 -0800 | [diff] [blame] | 29 | fClipR.moveTo(34, 0); |
| 30 | fClipR.lineTo(34, 5); |
| 31 | fClipR.lineTo(31, 5); |
| 32 | fClipR.lineTo(30.5, 4); |
| 33 | fClipR.lineTo(31.5, 2.5); |
| 34 | fClipR.lineTo(30.5, 1); |
| 35 | fClipR.lineTo(31, 0); |
| 36 | fClipR.close(); |
halcanary | 8b2bc25 | 2015-10-06 09:41:47 -0700 | [diff] [blame] | 37 | |
caryclark | 1f17ab5 | 2015-12-16 08:53:41 -0800 | [diff] [blame] | 38 | fClipS.addRect(SkRect::MakeIWH(4, 5)); |
halcanary | 8b2bc25 | 2015-10-06 09:41:47 -0700 | [diff] [blame] | 39 | |
caryclark | 1f17ab5 | 2015-12-16 08:53:41 -0800 | [diff] [blame] | 40 | fPaths[0].moveTo(30, 0); // single line segment |
| 41 | fPaths[0].rLineTo(30, 0); |
halcanary | 8b2bc25 | 2015-10-06 09:41:47 -0700 | [diff] [blame] | 42 | |
caryclark | 1f17ab5 | 2015-12-16 08:53:41 -0800 | [diff] [blame] | 43 | fPaths[1].moveTo(90, 0); // single line segment with close (does not draw caps) |
| 44 | fPaths[1].rLineTo(30, 0); |
| 45 | fPaths[1].close(); |
| 46 | |
| 47 | fPaths[2].moveTo(150, 0); // zero-length line |
| 48 | fPaths[2].rLineTo(0, 0); |
| 49 | |
| 50 | fPaths[3].moveTo(180, 0); // zero-length line with close (expected not to draw) |
| 51 | fPaths[3].rLineTo(0, 0); |
| 52 | fPaths[3].close(); |
| 53 | |
| 54 | fPaths[4].moveTo(210, 0); // close only, no line |
| 55 | fPaths[4].close(); |
| 56 | |
| 57 | fPaths[5].moveTo(30, 90); // all combos below should draw two caps |
| 58 | fPaths[5].rLineTo(0, 0); |
| 59 | fPaths[5].moveTo(60, 90); |
| 60 | fPaths[5].rLineTo(0, 0); |
| 61 | |
| 62 | fPaths[6].moveTo(90, 90); |
| 63 | fPaths[6].close(); |
| 64 | fPaths[6].moveTo(120, 90); |
| 65 | fPaths[6].close(); |
| 66 | |
| 67 | fPaths[7].moveTo(150, 90); |
| 68 | fPaths[7].rLineTo(0, 0); |
| 69 | fPaths[7].moveTo(180, 90); |
| 70 | fPaths[7].close(); |
| 71 | } |
| 72 | |
| 73 | |
| 74 | SkString onShortName() override { |
| 75 | return SkString("path_stroke_with_zero_length"); |
| 76 | } |
| 77 | |
| 78 | SkISize onISize() override { |
| 79 | return SkISize::Make(1120, 840); |
| 80 | } |
| 81 | |
| 82 | void onDraw(SkCanvas* canvas) override { |
| 83 | SkPaint bkgrnd; |
| 84 | bkgrnd.setColor(SK_ColorWHITE); |
| 85 | canvas->drawRect(SkRect::MakeIWH(onISize().fWidth, onISize().fHeight), bkgrnd); |
| 86 | |
| 87 | auto drawPaths = [&](SkPaint& paint, int indexMask) { |
| 88 | canvas->translate(0, 30.0f); |
| 89 | int index = 0; |
| 90 | for (const SkPath& path : fPaths) { |
| 91 | if (indexMask & (1 << index)) { |
| 92 | canvas->drawPath(path, paint); |
| 93 | } |
mtklein | 48156ed | 2016-04-06 14:25:35 -0700 | [diff] [blame] | 94 | if (this->getMode() == skiagm::GM::kSample_Mode && paint.getStrokeWidth() < 2) { |
caryclark | 1f17ab5 | 2015-12-16 08:53:41 -0800 | [diff] [blame] | 95 | drawFat(canvas, path, paint, index); |
| 96 | } |
| 97 | ++index; |
| 98 | } |
| 99 | }; |
| 100 | |
| 101 | if (false) { // debugging variant that draws a single element |
| 102 | SkScalar width = 0; |
| 103 | bool antialias = true; |
| 104 | |
| 105 | SkPaint butt; |
| 106 | butt.setAntiAlias(antialias); |
| 107 | butt.setStyle(SkPaint::kStroke_Style); |
| 108 | butt.setStrokeWidth(width); |
| 109 | |
| 110 | SkPaint round(butt); |
| 111 | round.setStrokeCap(SkPaint::kRound_Cap); |
| 112 | drawPaths(round, 1 << 7); |
| 113 | return; |
halcanary | 8b2bc25 | 2015-10-06 09:41:47 -0700 | [diff] [blame] | 114 | } |
halcanary | 8b2bc25 | 2015-10-06 09:41:47 -0700 | [diff] [blame] | 115 | |
caryclark | 1f17ab5 | 2015-12-16 08:53:41 -0800 | [diff] [blame] | 116 | SkScalar widths[] = { 0, .999f, 1, 1.001f, 20 }; |
| 117 | bool aliases[] = { false, true }; |
| 118 | for (bool antialias : aliases) { |
| 119 | canvas->save(); |
mtklein | 6362702 | 2015-12-28 11:15:46 -0800 | [diff] [blame] | 120 | for (SkScalar width : widths) { |
caryclark | 1f17ab5 | 2015-12-16 08:53:41 -0800 | [diff] [blame] | 121 | canvas->save(); |
| 122 | SkPaint butt; |
| 123 | butt.setAntiAlias(antialias); |
| 124 | butt.setStyle(SkPaint::kStroke_Style); |
| 125 | butt.setStrokeWidth(width); |
| 126 | drawPaths(butt, -1); |
halcanary | 8b2bc25 | 2015-10-06 09:41:47 -0700 | [diff] [blame] | 127 | |
caryclark | 1f17ab5 | 2015-12-16 08:53:41 -0800 | [diff] [blame] | 128 | SkPaint round(butt); |
| 129 | round.setStrokeCap(SkPaint::kRound_Cap); |
| 130 | drawPaths(round, -1); |
halcanary | 8b2bc25 | 2015-10-06 09:41:47 -0700 | [diff] [blame] | 131 | |
caryclark | 1f17ab5 | 2015-12-16 08:53:41 -0800 | [diff] [blame] | 132 | SkPaint square(butt); |
| 133 | square.setStrokeCap(SkPaint::kSquare_Cap); |
| 134 | drawPaths(square, -1); |
| 135 | canvas->restore(); |
| 136 | canvas->translate(220, 0); |
| 137 | } |
| 138 | canvas->restore(); |
| 139 | canvas->translate(0, 210); |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | private: |
| 144 | void drawFat(SkCanvas* canvas, const SkPath& path, const SkPaint& paint, int index) { |
| 145 | const SkScalar scale = 10; |
| 146 | SkRect bounds = path.getBounds(); |
| 147 | SkBitmap offscreen; |
| 148 | offscreen.allocN32Pixels(SkScalarRoundToInt(bounds.width() + 4), |
| 149 | SkScalarRoundToInt(bounds.height() + 4)); |
mtklein | 6362702 | 2015-12-28 11:15:46 -0800 | [diff] [blame] | 150 | offscreen.eraseColor(SK_ColorWHITE); |
caryclark | 1f17ab5 | 2015-12-16 08:53:41 -0800 | [diff] [blame] | 151 | SkScalar pathX = bounds.fLeft - 2; |
| 152 | SkScalar pathY = bounds.fTop - 2; |
| 153 | SkMatrix cMatrix = canvas->getTotalMatrix(); |
| 154 | if (!canvas->readPixels(&offscreen, SkScalarRoundToInt(pathX + cMatrix.getTranslateX()), |
| 155 | SkScalarRoundToInt(pathY + cMatrix.getTranslateY()))) { |
| 156 | return; |
| 157 | } |
| 158 | |
| 159 | canvas->save(); |
| 160 | SkMatrix clipM; |
| 161 | clipM.reset(); |
| 162 | clipM.preScale(scale, scale); |
| 163 | clipM.postTranslate(bounds.fLeft - 17, bounds.fTop - 24.5f + 420); |
| 164 | SkPath clip; |
| 165 | if (index < 2) { |
| 166 | fClipL.transform(clipM, &clip); |
| 167 | } else { |
| 168 | fClipS.transform(clipM, &clip); |
| 169 | } |
reed | 6699838 | 2016-09-21 11:15:07 -0700 | [diff] [blame] | 170 | canvas->clipPath(clip, true); |
caryclark | 1f17ab5 | 2015-12-16 08:53:41 -0800 | [diff] [blame] | 171 | canvas->scale(scale, scale); |
| 172 | canvas->drawBitmap(offscreen, (bounds.fLeft - 17) / scale, |
| 173 | (bounds.fTop - 20 + 420) / scale); |
| 174 | canvas->restore(); |
| 175 | |
| 176 | if (bounds.width() > 20) { |
| 177 | canvas->save(); |
| 178 | clipM.reset(); |
| 179 | clipM.preScale(scale, scale); |
| 180 | clipM.postTranslate(bounds.fLeft - 17 - 275, bounds.fTop - 24.5f + 420); |
| 181 | SkPath clip; |
| 182 | fClipR.transform(clipM, &clip); |
reed | 6699838 | 2016-09-21 11:15:07 -0700 | [diff] [blame] | 183 | canvas->clipPath(clip, true); |
caryclark | 1f17ab5 | 2015-12-16 08:53:41 -0800 | [diff] [blame] | 184 | canvas->scale(10.f, 10.f); |
| 185 | canvas->drawBitmap(offscreen, (bounds.fLeft - 17 - 275 |
| 186 | + (index >= 5 ? 5 : 0)) / scale, (bounds.fTop - 20 + 420) / scale); |
| 187 | canvas->restore(); |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | }; |
| 192 | |
| 193 | /////////////////////////////////////////////////////////////////////////////// |
| 194 | |
| 195 | DEF_GM( return new StrokeZeroGM(); ) |