Chris Dalton | a6fcb76 | 2019-05-13 08:57:53 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2019 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 "include/utils/SkRandom.h" |
| 9 | #include "src/gpu/ccpr/GrOctoBounds.h" |
| 10 | #include "tests/Test.h" |
| 11 | |
| 12 | using namespace skiatest; |
| 13 | |
| 14 | constexpr static float kEpsilon = 1e-3f; |
| 15 | |
| 16 | static int numClipsOut = 0; |
| 17 | static int numIntersectClips = 0; |
| 18 | |
| 19 | // Ensures devBounds and devBounds45 are valid. Namely, that they are both tight bounding boxes |
| 20 | // around a valid octagon. |
| 21 | static void validate_octo_bounds( |
| 22 | Reporter* reporter, const SkIRect& clipRect, const GrOctoBounds& octoBounds) { |
| 23 | // Verify dev bounds are inside the clip rect. |
| 24 | REPORTER_ASSERT(reporter, octoBounds.left() >= (float)clipRect.left() - kEpsilon); |
| 25 | REPORTER_ASSERT(reporter, octoBounds.top() >= (float)clipRect.top() - kEpsilon); |
| 26 | REPORTER_ASSERT(reporter, octoBounds.right() <= (float)clipRect.right() + kEpsilon); |
| 27 | REPORTER_ASSERT(reporter, octoBounds.bottom() <= (float)clipRect.bottom() + kEpsilon); |
| 28 | |
| 29 | octoBounds.validateBoundsAreTight([reporter]( |
| 30 | bool cond, const char* file, int line, const char* code) { |
| 31 | if (!cond) { |
| 32 | reporter->reportFailedWithContext(skiatest::Failure(file, line, code, SkString())); |
| 33 | } |
| 34 | }); |
| 35 | } |
| 36 | |
| 37 | // This is a variant of SkRandom::nextRangeU that can handle negative numbers. As currently written, |
| 38 | // and assuming two's compliment, it would probably work to just call the existing nextRangeU |
| 39 | // implementation with negative value(s), but we go through this method as an extra precaution. |
| 40 | static int next_range_i(SkRandom* rand, int min, int max) { |
| 41 | int u = rand->nextRangeU(0, max - min); |
| 42 | return u + min; |
| 43 | } |
| 44 | |
| 45 | static void test_octagon(Reporter* reporter, SkRandom* rand, float l, float t, float r, float b) { |
| 46 | for (int i = 0; i < 20; ++i) { |
| 47 | float minL45 = GrOctoBounds::Get_x45(l,b); |
| 48 | float maxL45 = std::min(GrOctoBounds::Get_x45(r,b), GrOctoBounds::Get_x45(l,t)); |
| 49 | float minT45 = GrOctoBounds::Get_y45(l,t); |
| 50 | float maxT45 = std::min(GrOctoBounds::Get_y45(l,b), GrOctoBounds::Get_y45(r,t)); |
| 51 | float minR45 = std::max(GrOctoBounds::Get_x45(l,t), GrOctoBounds::Get_x45(r,b)); |
| 52 | float maxR45 = GrOctoBounds::Get_x45(r,t); |
| 53 | float minB45 = std::max(GrOctoBounds::Get_y45(r,t), GrOctoBounds::Get_y45(l,b)); |
| 54 | float maxB45 = GrOctoBounds::Get_y45(r,b); |
| 55 | |
| 56 | // Pick somewhat valid 45 degree bounds. |
| 57 | float l45 = rand->nextRangeF(minL45, maxL45); |
| 58 | float t45 = rand->nextRangeF(minT45, maxT45); |
| 59 | float r45 = rand->nextRangeF(minR45, maxR45); |
| 60 | float b45 = rand->nextRangeF(minB45, maxB45); |
| 61 | |
| 62 | // Grow out diagonal corners if too tight, making 45 bounds valid. |
| 63 | std::function<void()> growOutDiagonals[4] = { |
| 64 | [&]() { // Push top-left diagonal corner outside left edge. |
| 65 | float miss = GrOctoBounds::Get_x(l45,t45) - l; |
| 66 | if (miss > 0) { |
| 67 | // x = (x45 + y45)/2 |
| 68 | l45 -= miss; |
| 69 | if (l45 < minL45) { |
| 70 | t45 -= minL45 - l45; |
| 71 | l45 = minL45; |
| 72 | } |
| 73 | t45 -= miss; |
| 74 | if (t45 < minT45) { |
| 75 | l45 -= minT45 - t45; |
| 76 | t45 = minT45; |
| 77 | } |
| 78 | } |
| 79 | }, |
| 80 | [&]() { // Push top-right diagonal corner outside top edge. |
| 81 | float miss = GrOctoBounds::Get_y(r45,t45) - t; |
| 82 | if (miss > 0) { |
| 83 | // y = (y45 - x45)/2 |
| 84 | r45 += miss; |
| 85 | if (r45 > maxR45) { |
| 86 | t45 -= r45 - maxR45; |
| 87 | r45 = maxR45; |
| 88 | } |
| 89 | t45 -= miss; |
| 90 | if (t45 < minT45) { |
| 91 | r45 += minT45 - t45; |
| 92 | t45 = minT45; |
| 93 | } |
| 94 | } |
| 95 | }, |
| 96 | [&]() { // Push bottom-right diagonal corner outside right edge. |
| 97 | float miss = r - GrOctoBounds::Get_x(r45,b45); |
| 98 | if (miss > 0) { |
| 99 | // x = (x45 + y45)/2 |
| 100 | r45 += miss; |
| 101 | if (r45 > maxR45) { |
| 102 | b45 += r45 - maxR45; |
| 103 | r45 = maxR45; |
| 104 | } |
| 105 | b45 += miss; |
| 106 | if (b45 > maxB45) { |
| 107 | r45 += b45 - maxB45; |
| 108 | b45 = maxB45; |
| 109 | } |
| 110 | } |
| 111 | }, |
| 112 | [&]() { // Push bottom-left diagonal corner outside bottom edge. |
| 113 | float miss = b - GrOctoBounds::Get_y(l45,b45); |
| 114 | if (miss > 0) { |
| 115 | // y = (y45 - x45)/2 |
| 116 | l45 -= miss; |
| 117 | if (l45 < minL45) { |
| 118 | b45 += minL45 - l45; |
| 119 | l45 = minL45; |
| 120 | } |
| 121 | b45 += miss; |
| 122 | if (b45 > maxB45) { |
| 123 | l45 -= b45 - maxB45; |
| 124 | b45 = maxB45; |
| 125 | } |
| 126 | } |
| 127 | }, |
| 128 | }; |
| 129 | // Shuffle. |
| 130 | for (int i = 0; i < 10; ++i) { |
| 131 | std::swap(growOutDiagonals[rand->nextRangeU(0, 3)], |
| 132 | growOutDiagonals[rand->nextRangeU(0, 3)]); |
| 133 | } |
| 134 | for (const auto& f : growOutDiagonals) { |
| 135 | f(); |
| 136 | } |
| 137 | |
| 138 | GrOctoBounds octoBounds(SkRect::MakeLTRB(l,t,r,b), SkRect::MakeLTRB(l45,t45,r45,b45)); |
| 139 | |
| 140 | SkIRect devIBounds; |
| 141 | octoBounds.roundOut(&devIBounds); |
| 142 | |
| 143 | // Test a clip rect that completely encloses the octagon. |
| 144 | bool clipSuccess = octoBounds.clip(devIBounds); |
| 145 | REPORTER_ASSERT(reporter, clipSuccess); |
| 146 | // Should not have clipped anything. |
| 147 | REPORTER_ASSERT(reporter, octoBounds == GrOctoBounds({l,t,r,b}, {l45,t45,r45,b45})); |
| 148 | validate_octo_bounds(reporter, devIBounds, octoBounds); |
| 149 | |
| 150 | // Test a bunch of random clip rects. |
| 151 | for (int j = 0; j < 20; ++j) { |
| 152 | SkIRect clipRect; |
| 153 | do { |
| 154 | clipRect.fLeft = next_range_i(rand, devIBounds.left(), devIBounds.right() - 1); |
| 155 | clipRect.fTop = next_range_i(rand, devIBounds.top(), devIBounds.bottom() - 1); |
| 156 | clipRect.fRight = next_range_i(rand, clipRect.left() + 1, devIBounds.right()); |
| 157 | clipRect.fBottom = next_range_i(rand, clipRect.top() + 1, devIBounds.bottom()); |
| 158 | } while (clipRect == devIBounds); |
| 159 | |
| 160 | GrOctoBounds octoBoundsClipped = octoBounds; |
| 161 | if (!octoBoundsClipped.clip(clipRect)) { |
| 162 | // Ensure clipRect is completely outside one of the diagonals. |
| 163 | float il = (float)clipRect.left(); |
| 164 | float it = (float)clipRect.top(); |
| 165 | float ir = (float)clipRect.right(); |
| 166 | float ib = (float)clipRect.bottom(); |
| 167 | REPORTER_ASSERT(reporter, |
| 168 | GrOctoBounds::Get_x45(ir,it) <= l45 + kEpsilon || |
| 169 | GrOctoBounds::Get_y45(ir,ib) <= t45 + kEpsilon || |
| 170 | GrOctoBounds::Get_x45(il,ib) >= r45 - kEpsilon || |
| 171 | GrOctoBounds::Get_y45(il,it) >= b45 - kEpsilon); |
| 172 | ++numClipsOut; |
| 173 | } else { |
| 174 | validate_octo_bounds(reporter, clipRect, octoBoundsClipped); |
| 175 | ++numIntersectClips; |
| 176 | } |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | } |
| 181 | |
| 182 | DEF_TEST(OctoBounds, reporter) { |
| 183 | numClipsOut = 0; |
| 184 | numIntersectClips = 0; |
| 185 | |
| 186 | SkRandom rand; |
| 187 | test_octagon(reporter, &rand, 0, 0, 100, 100); |
| 188 | test_octagon(reporter, &rand, -2, 0, 2, 100); |
| 189 | test_octagon(reporter, &rand, 0, -10, 100, 0); |
| 190 | // We can't test Infs or NaNs because they trigger internal asserts when setting GrOctoBounds. |
| 191 | |
| 192 | // Sanity check on our random clip testing.. Just make we hit both types of clip. |
| 193 | REPORTER_ASSERT(reporter, numClipsOut > 0); |
| 194 | REPORTER_ASSERT(reporter, numIntersectClips > 0); |
| 195 | } |