1 2 /* 3 * Copyright 2011 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 #include "Test.h" 9 10 #include "SkCanvas.h" 11 #include "SkPaint.h" 12 #include "SkCubicClipper.h" 13 #include "SkGeometry.h" 14 15 // Currently the supersampler blitter uses int16_t for its index into an array 16 // the width of the clip. Test that we don't crash/assert if we try to draw 17 // with a device/clip that is larger. 18 static void test_giantClip() { 19 SkBitmap bm; 20 bm.setConfig(SkBitmap::kARGB_8888_Config, 64919, 1); 21 bm.allocPixels(); 22 SkCanvas canvas(bm); 23 canvas.clear(SK_ColorTRANSPARENT); 24 25 SkPath path; 26 path.moveTo(0, 0); path.lineTo(1, 0); path.lineTo(33, 1); 27 SkPaint paint; 28 paint.setAntiAlias(true); 29 canvas.drawPath(path, paint); 30 } 31 32 static void PrintCurve(const char *name, const SkPoint crv[4]) { 33 printf("%s: %.10g, %.10g, %.10g, %.10g, %.10g, %.10g, %.10g, %.10g\n", 34 name, 35 (float)crv[0].fX, (float)crv[0].fY, 36 (float)crv[1].fX, (float)crv[1].fY, 37 (float)crv[2].fX, (float)crv[2].fY, 38 (float)crv[3].fX, (float)crv[3].fY); 39 40 } 41 42 43 static bool CurvesAreEqual(const SkPoint c0[4], 44 const SkPoint c1[4], 45 float tol) { 46 for (int i = 0; i < 4; i++) { 47 if (SkScalarAbs(c0[i].fX - c1[i].fX) > SkFloatToScalar(tol) || 48 SkScalarAbs(c0[i].fY - c1[i].fY) > SkFloatToScalar(tol) 49 ) { 50 PrintCurve("c0", c0); 51 PrintCurve("c1", c1); 52 return false; 53 } 54 } 55 return true; 56 } 57 58 59 static SkPoint* SetCurve(float x0, float y0, 60 float x1, float y1, 61 float x2, float y2, 62 float x3, float y3, 63 SkPoint crv[4]) { 64 crv[0].fX = SkFloatToScalar(x0); crv[0].fY = SkFloatToScalar(y0); 65 crv[1].fX = SkFloatToScalar(x1); crv[1].fY = SkFloatToScalar(y1); 66 crv[2].fX = SkFloatToScalar(x2); crv[2].fY = SkFloatToScalar(y2); 67 crv[3].fX = SkFloatToScalar(x3); crv[3].fY = SkFloatToScalar(y3); 68 return crv; 69 } 70 71 72 static void TestCubicClipping(skiatest::Reporter* reporter) { 73 static SkPoint crv[4] = { 74 { SkIntToScalar(0), SkIntToScalar(0) }, 75 { SkIntToScalar(2), SkIntToScalar(3) }, 76 { SkIntToScalar(1), SkIntToScalar(10) }, 77 { SkIntToScalar(4), SkIntToScalar(12) } 78 }; 79 80 SkCubicClipper clipper; 81 SkPoint clipped[4], shouldbe[4]; 82 SkIRect clipRect; 83 bool success; 84 const float tol = SkFloatToScalar(1e-4f); 85 86 // Test no clip, with plenty of room. 87 clipRect.set(-2, -2, 6, 14); 88 clipper.setClip(clipRect); 89 success = clipper.clipCubic(crv, clipped); 90 REPORTER_ASSERT(reporter, success == true); 91 REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve( 92 0, 0, 2, 3, 1, 10, 4, 12, shouldbe), tol)); 93 94 // Test no clip, touching first point. 95 clipRect.set(-2, 0, 6, 14); 96 clipper.setClip(clipRect); 97 success = clipper.clipCubic(crv, clipped); 98 REPORTER_ASSERT(reporter, success == true); 99 REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve( 100 0, 0, 2, 3, 1, 10, 4, 12, shouldbe), tol)); 101 102 // Test no clip, touching last point. 103 clipRect.set(-2, -2, 6, 12); 104 clipper.setClip(clipRect); 105 success = clipper.clipCubic(crv, clipped); 106 REPORTER_ASSERT(reporter, success == true); 107 REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve( 108 0, 0, 2, 3, 1, 10, 4, 12, shouldbe), tol)); 109 110 // Test all clip. 111 clipRect.set(-2, 14, 6, 20); 112 clipper.setClip(clipRect); 113 success = clipper.clipCubic(crv, clipped); 114 REPORTER_ASSERT(reporter, success == false); 115 116 // Test clip at 1. 117 clipRect.set(-2, 1, 6, 14); 118 clipper.setClip(clipRect); 119 success = clipper.clipCubic(crv, clipped); 120 REPORTER_ASSERT(reporter, success == true); 121 REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve( 122 0.5126125216f, 1, 123 1.841195941f, 4.337081432f, 124 1.297019958f, 10.19801331f, 125 4, 12, 126 shouldbe), tol)); 127 128 // Test clip at 2. 129 clipRect.set(-2, 2, 6, 14); 130 clipper.setClip(clipRect); 131 success = clipper.clipCubic(crv, clipped); 132 REPORTER_ASSERT(reporter, success == true); 133 REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve( 134 00.8412352204f, 2, 135 1.767683744f, 5.400758266f, 136 1.55052948f, 10.36701965f, 137 4, 12, 138 shouldbe), tol)); 139 140 // Test clip at 11. 141 clipRect.set(-2, -2, 6, 11); 142 clipper.setClip(clipRect); 143 success = clipper.clipCubic(crv, clipped); 144 REPORTER_ASSERT(reporter, success == true); 145 REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve( 146 0, 0, 147 1.742904663f, 2.614356995f, 148 1.207521796f, 8.266430855f, 149 3.026495695f, 11, 150 shouldbe), tol)); 151 152 // Test clip at 10. 153 clipRect.set(-2, -2, 6, 10); 154 clipper.setClip(clipRect); 155 success = clipper.clipCubic(crv, clipped); 156 REPORTER_ASSERT(reporter, success == true); 157 REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve( 158 0, 0, 159 1.551193237f, 2.326789856f, 160 1.297736168f, 7.059780121f, 161 2.505550385f, 10, 162 shouldbe), tol)); 163 164 test_giantClip(); 165 } 166 167 168 169 170 #include "TestClassDef.h" 171 DEFINE_TESTCLASS("CubicClipper", CubicClippingTestClass, TestCubicClipping) 172
