1 /* 2 * Copyright 2011 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 "Test.h" 9 #include "SkPath.h" 10 #include "SkCanvas.h" 11 12 static void appendStr(SkString* str, const SkPaint& paint) { 13 str->appendf(" style[%d] cap[%d] join[%d] antialias[%d]", 14 paint.getStyle(), paint.getStrokeCap(), 15 paint.getStrokeJoin(), paint.isAntiAlias()); 16 } 17 18 static void appendStr(SkString* str, const SkPath& path) { 19 str->appendf(" filltype[%d] ptcount[%d]", 20 path.getFillType(), path.countPoints()); 21 } 22 23 #define DIMENSION 32 24 25 static void drawAndTest(skiatest::Reporter* reporter, const SkPath& path, 26 const SkPaint& paint, bool shouldDraw) { 27 SkBitmap bm; 28 // explicitly specify a trim rowbytes, so we have no padding on each row 29 bm.setConfig(SkBitmap::kARGB_8888_Config, DIMENSION, DIMENSION, DIMENSION*4); 30 bm.allocPixels(); 31 bm.eraseColor(SK_ColorTRANSPARENT); 32 33 SkCanvas canvas(bm); 34 SkPaint p(paint); 35 p.setColor(SK_ColorWHITE); 36 37 canvas.drawPath(path, p); 38 39 size_t count = DIMENSION * DIMENSION; 40 const SkPMColor* ptr = bm.getAddr32(0, 0); 41 42 SkPMColor andValue = ~0U; 43 SkPMColor orValue = 0; 44 for (size_t i = 0; i < count; ++i) { 45 SkPMColor c = ptr[i]; 46 andValue &= c; 47 orValue |= c; 48 } 49 50 // success means we drew everywhere or nowhere (depending on shouldDraw) 51 bool success = shouldDraw ? (~0U == andValue) : (0 == orValue); 52 53 if (!success) { 54 SkString str; 55 if (shouldDraw) { 56 str.set("Path expected to draw everywhere, but didn't. "); 57 } else { 58 str.set("Path expected to draw nowhere, but did. "); 59 } 60 appendStr(&str, paint); 61 appendStr(&str, path); 62 reporter->report(str.c_str(), skiatest::Reporter::kFailed); 63 64 // uncomment this if you want to step in to see the failure 65 // canvas.drawPath(path, p); 66 } 67 } 68 69 static void iter_paint(skiatest::Reporter* reporter, const SkPath& path, bool shouldDraw) { 70 static const SkPaint::Cap gCaps[] = { 71 SkPaint::kButt_Cap, 72 SkPaint::kRound_Cap, 73 SkPaint::kSquare_Cap 74 }; 75 static const SkPaint::Join gJoins[] = { 76 SkPaint::kMiter_Join, 77 SkPaint::kRound_Join, 78 SkPaint::kBevel_Join 79 }; 80 static const SkPaint::Style gStyles[] = { 81 SkPaint::kFill_Style, 82 SkPaint::kStroke_Style, 83 SkPaint::kStrokeAndFill_Style 84 }; 85 for (size_t cap = 0; cap < SK_ARRAY_COUNT(gCaps); ++cap) { 86 for (size_t join = 0; join < SK_ARRAY_COUNT(gJoins); ++join) { 87 for (size_t style = 0; style < SK_ARRAY_COUNT(gStyles); ++style) { 88 SkPaint paint; 89 paint.setStrokeWidth(SkIntToScalar(10)); 90 91 paint.setStrokeCap(gCaps[cap]); 92 paint.setStrokeJoin(gJoins[join]); 93 paint.setStyle(gStyles[style]); 94 95 paint.setAntiAlias(false); 96 drawAndTest(reporter, path, paint, shouldDraw); 97 paint.setAntiAlias(true); 98 drawAndTest(reporter, path, paint, shouldDraw); 99 } 100 } 101 } 102 } 103 104 #define CX (SkIntToScalar(DIMENSION) / 2) 105 #define CY (SkIntToScalar(DIMENSION) / 2) 106 107 static void make_empty(SkPath* path) {} 108 static void make_M(SkPath* path) { path->moveTo(CX, CY); } 109 static void make_MM(SkPath* path) { path->moveTo(CX, CY); path->moveTo(CX, CY); } 110 static void make_MZM(SkPath* path) { path->moveTo(CX, CY); path->close(); path->moveTo(CX, CY); } 111 static void make_L(SkPath* path) { path->moveTo(CX, CY); path->lineTo(CX, CY); } 112 static void make_Q(SkPath* path) { path->moveTo(CX, CY); path->quadTo(CX, CY, CX, CY); } 113 static void make_C(SkPath* path) { path->moveTo(CX, CY); path->cubicTo(CX, CY, CX, CY, CX, CY); } 114 115 /* Two invariants are tested: How does an empty/degenerate path draw? 116 * - if the path is drawn inverse, it should draw everywhere 117 * - if the path is drawn non-inverse, it should draw nowhere 118 * 119 * Things to iterate on: 120 * - path (empty, degenerate line/quad/cubic w/ and w/o close 121 * - paint style 122 * - path filltype 123 * - path stroke variants (e.g. caps, joins, width) 124 */ 125 static void test_emptydrawing(skiatest::Reporter* reporter) { 126 static void (*gMakeProc[])(SkPath*) = { 127 make_empty, make_M, make_MM, make_MZM, make_L, make_Q, make_C 128 }; 129 static SkPath::FillType gFills[] = { 130 SkPath::kWinding_FillType, 131 SkPath::kEvenOdd_FillType, 132 SkPath::kInverseWinding_FillType, 133 SkPath::kInverseEvenOdd_FillType 134 }; 135 for (int doClose = 0; doClose < 2; ++doClose) { 136 for (size_t i = 0; i < SK_ARRAY_COUNT(gMakeProc); ++i) { 137 SkPath path; 138 gMakeProc[i](&path); 139 if (doClose) { 140 path.close(); 141 } 142 for (size_t fill = 0; fill < SK_ARRAY_COUNT(gFills); ++fill) { 143 path.setFillType(gFills[fill]); 144 bool shouldDraw = path.isInverseFillType(); 145 iter_paint(reporter, path, shouldDraw); 146 } 147 } 148 } 149 } 150 151 static void TestEmptyPath(skiatest::Reporter* reporter) { 152 test_emptydrawing(reporter); 153 } 154 155 #include "TestClassDef.h" 156 DEFINE_TESTCLASS("EmptyPath", TestEmptyPathClass, TestEmptyPath) 157
