1 /* 2 * Copyright 2013 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/gm.h" 9 #include "include/core/SkCanvas.h" 10 #include "include/core/SkPaint.h" 11 #include "include/core/SkPathBuilder.h" 12 #include "include/core/SkScalar.h" 13 #include "include/core/SkSize.h" 14 #include "include/core/SkString.h" 15 #include "include/core/SkTypes.h" 16 17 namespace skiagm { 18 19 // This GM tests a grab-bag of non-closed paths. All these paths look like 20 // closed rects, but they don't call path.close(). Depending on the stroke 21 // settings these slightly different paths give widely different results. 22 class NonClosedPathsGM: public GM { 23 public: NonClosedPathsGM()24 NonClosedPathsGM() {} 25 26 enum ClosureType { 27 TotallyNonClosed, // The last point doesn't coincide with the first one in the contour. 28 // The path looks not closed at all. 29 30 FakeCloseCorner, // The last point coincides with the first one at a corner. 31 // The path looks closed, but final rendering has 2 ends with cap. 32 33 FakeCloseMiddle, // The last point coincides with the first one in the middle of a line. 34 // The path looks closed, and the final rendering looks closed too. 35 36 kClosureTypeCount 37 }; 38 39 protected: getName() const40 SkString getName() const override { return SkString("nonclosedpaths"); } 41 42 // 12 * 18 + 3 cases, every case is 100 * 100 pixels. getISize()43 SkISize getISize() override { return SkISize::Make(1220, 1920); } 44 45 // Use rect-like geometry for non-closed path, for right angles make it 46 // easier to show the visual difference of lineCap and lineJoin. MakePath(ClosureType type)47 static SkPath MakePath(ClosureType type) { 48 SkPathBuilder path; 49 if (FakeCloseMiddle == type) { 50 path.moveTo(30, 50); 51 path.lineTo(30, 30); 52 } else { 53 path.moveTo(30, 30); 54 } 55 path.lineTo(70, 30); 56 path.lineTo(70, 70); 57 path.lineTo(30, 70); 58 path.lineTo(30, 50); 59 if (FakeCloseCorner == type) { 60 path.lineTo(30, 30); 61 } 62 return path.detach(); 63 } 64 65 // Set the location for the current test on the canvas SetLocation(SkCanvas * canvas,int counter,int lineNum)66 static void SetLocation(SkCanvas* canvas, int counter, int lineNum) { 67 SkScalar x = SK_Scalar1 * 100 * (counter % lineNum) + 10 + SK_Scalar1 / 4; 68 SkScalar y = SK_Scalar1 * 100 * (counter / lineNum) + 10 + 3 * SK_Scalar1 / 4; 69 canvas->translate(x, y); 70 } 71 onDraw(SkCanvas * canvas)72 void onDraw(SkCanvas* canvas) override { 73 // Stroke widths are: 74 // 0(may use hairline rendering), 10(common case for stroke-style) 75 // 40 and 50(>= geometry width/height, make the contour filled in fact) 76 constexpr int kStrokeWidth[] = {0, 10, 40, 50}; 77 int numWidths = std::size(kStrokeWidth); 78 79 constexpr SkPaint::Style kStyle[] = { 80 SkPaint::kStroke_Style, SkPaint::kStrokeAndFill_Style 81 }; 82 83 constexpr SkPaint::Cap kCap[] = { 84 SkPaint::kButt_Cap, SkPaint::kRound_Cap, SkPaint::kSquare_Cap 85 }; 86 87 constexpr SkPaint::Join kJoin[] = { 88 SkPaint::kMiter_Join, SkPaint::kRound_Join, SkPaint::kBevel_Join 89 }; 90 91 constexpr ClosureType kType[] = { 92 TotallyNonClosed, FakeCloseCorner, FakeCloseMiddle 93 }; 94 95 int counter = 0; 96 SkPaint paint; 97 paint.setAntiAlias(true); 98 99 // For stroke style painter and fill-and-stroke style painter 100 for (size_t type = 0; type < kClosureTypeCount; ++type) { 101 for (size_t style = 0; style < std::size(kStyle); ++style) { 102 for (size_t cap = 0; cap < std::size(kCap); ++cap) { 103 for (size_t join = 0; join < std::size(kJoin); ++join) { 104 for (int width = 0; width < numWidths; ++width) { 105 canvas->save(); 106 SetLocation(canvas, counter, SkPaint::kJoinCount * numWidths); 107 108 SkPath path = MakePath(kType[type]); 109 110 paint.setStyle(kStyle[style]); 111 paint.setStrokeCap(kCap[cap]); 112 paint.setStrokeJoin(kJoin[join]); 113 paint.setStrokeWidth(SkIntToScalar(kStrokeWidth[width])); 114 115 canvas->drawPath(path, paint); 116 canvas->restore(); 117 ++counter; 118 } 119 } 120 } 121 } 122 } 123 124 // For fill style painter 125 paint.setStyle(SkPaint::kFill_Style); 126 for (size_t type = 0; type < kClosureTypeCount; ++type) { 127 canvas->save(); 128 SetLocation(canvas, counter, SkPaint::kJoinCount * numWidths); 129 130 SkPath path = MakePath(kType[type]); 131 132 canvas->drawPath(path, paint); 133 canvas->restore(); 134 ++counter; 135 } 136 } 137 138 private: 139 using INHERITED = GM; 140 }; 141 142 ////////////////////////////////////////////////////////////////////////////// 143 144 DEF_GM(return new NonClosedPathsGM;) 145 146 } // namespace skiagm 147