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.h" 9 #include "SkCanvas.h" 10 #include "SkPath.h" 11 12 namespace skiagm { 13 14 // This GM tests a grab-bag of non-closed paths. All these paths look like 15 // closed rects, but they don't call path.close(). Depending on the stroke 16 // settings these slightly different paths give widely different results. 17 class NonClosedPathsGM: public GM { 18 public: 19 NonClosedPathsGM() {} 20 21 enum ClosureType { 22 TotallyNonClosed, // The last point doesn't coincide with the first one in the contour. 23 // The path looks not closed at all. 24 25 FakeCloseCorner, // The last point coincides with the first one at a corner. 26 // The path looks closed, but final rendering has 2 ends with cap. 27 28 FakeCloseMiddle, // The last point coincides with the first one in the middle of a line. 29 // The path looks closed, and the final rendering looks closed too. 30 31 kClosureTypeCount 32 }; 33 34 protected: 35 virtual uint32_t onGetFlags() const SK_OVERRIDE { 36 return kSkipTiled_Flag; 37 } 38 39 virtual SkString onShortName() SK_OVERRIDE { 40 return SkString("nonclosedpaths"); 41 } 42 43 // 12 * 18 + 3 cases, every case is 100 * 100 pixels. 44 virtual SkISize onISize() SK_OVERRIDE { 45 return SkISize::Make(1220, 1920); 46 } 47 48 // Use rect-like geometry for non-closed path, for right angles make it 49 // easier to show the visual difference of lineCap and lineJoin. 50 static void MakePath(SkPath* path, ClosureType type) { 51 if (FakeCloseMiddle == type) { 52 path->moveTo(30, 50); 53 path->lineTo(30, 30); 54 } else { 55 path->moveTo(30, 30); 56 } 57 path->lineTo(70, 30); 58 path->lineTo(70, 70); 59 path->lineTo(30, 70); 60 path->lineTo(30, 50); 61 if (FakeCloseCorner == type) { 62 path->lineTo(30, 30); 63 } 64 } 65 66 // Set the location for the current test on the canvas 67 static void SetLocation(SkCanvas* canvas, int counter, int lineNum) { 68 SkScalar x = SK_Scalar1 * 100 * (counter % lineNum) + 10 + SK_Scalar1 / 4; 69 SkScalar y = SK_Scalar1 * 100 * (counter / lineNum) + 10 + 3 * SK_Scalar1 / 4; 70 canvas->translate(x, y); 71 } 72 73 virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE { 74 // Stroke widths are: 75 // 0(may use hairline rendering), 10(common case for stroke-style) 76 // 40 and 50(>= geometry width/height, make the contour filled in fact) 77 static const int kStrokeWidth[] = {0, 10, 40, 50}; 78 int numWidths = SK_ARRAY_COUNT(kStrokeWidth); 79 80 static const SkPaint::Style kStyle[] = { 81 SkPaint::kStroke_Style, SkPaint::kStrokeAndFill_Style 82 }; 83 84 static const SkPaint::Cap kCap[] = { 85 SkPaint::kButt_Cap, SkPaint::kRound_Cap, SkPaint::kSquare_Cap 86 }; 87 88 static const SkPaint::Join kJoin[] = { 89 SkPaint::kMiter_Join, SkPaint::kRound_Join, SkPaint::kBevel_Join 90 }; 91 92 static const ClosureType kType[] = { 93 TotallyNonClosed, FakeCloseCorner, FakeCloseMiddle 94 }; 95 96 int counter = 0; 97 SkPaint paint; 98 paint.setAntiAlias(true); 99 100 // For stroke style painter and fill-and-stroke style painter 101 for (size_t type = 0; type < kClosureTypeCount; ++type) { 102 for (size_t style = 0; style < SK_ARRAY_COUNT(kStyle); ++style) { 103 for (size_t cap = 0; cap < SK_ARRAY_COUNT(kCap); ++cap) { 104 for (size_t join = 0; join < SK_ARRAY_COUNT(kJoin); ++join) { 105 for (int width = 0; width < numWidths; ++width) { 106 canvas->save(); 107 SetLocation(canvas, counter, SkPaint::kJoinCount * numWidths); 108 109 SkPath path; 110 MakePath(&path, kType[type]); 111 112 paint.setStyle(kStyle[style]); 113 paint.setStrokeCap(kCap[cap]); 114 paint.setStrokeJoin(kJoin[join]); 115 paint.setStrokeWidth(SkIntToScalar(kStrokeWidth[width])); 116 117 canvas->drawPath(path, paint); 118 canvas->restore(); 119 ++counter; 120 } 121 } 122 } 123 } 124 } 125 126 // For fill style painter 127 paint.setStyle(SkPaint::kFill_Style); 128 for (size_t type = 0; type < kClosureTypeCount; ++type) { 129 canvas->save(); 130 SetLocation(canvas, counter, SkPaint::kJoinCount * numWidths); 131 132 SkPath path; 133 MakePath(&path, kType[type]); 134 135 canvas->drawPath(path, paint); 136 canvas->restore(); 137 ++counter; 138 } 139 } 140 141 private: 142 typedef GM INHERITED; 143 }; 144 145 ////////////////////////////////////////////////////////////////////////////// 146 147 DEF_GM(return new NonClosedPathsGM;) 148 149 } 150