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 "SkRandom.h" 9 #include "Test.h" 10 #include "gradients/SkClampRange.h" 11 12 static skiatest::Reporter* gReporter; 13 #define R_ASSERT(cond) if (!(cond)) { \ 14 SkDebugf("%d: %s\n", __LINE__, #cond); \ 15 REPORTER_ASSERT(gReporter, cond); \ 16 } 17 18 // Arbitrary sentinel values outside [0, 0xFFFF]. 19 static const int kV0 = -42, kV1 = -53, kRamp = -64; 20 21 static void check_value(int64_t bigfx, int expected) { 22 if (bigfx < 0) { 23 R_ASSERT(expected == kV0); 24 } else if (bigfx > kFracMax_SkGradFixed) { 25 R_ASSERT(expected == kV1); 26 } else if (bigfx == kFracMax_SkGradFixed) { 27 // Either one is fine (and we do see both). 28 R_ASSERT(expected == kV1 || expected == kRamp); 29 } else { 30 R_ASSERT(expected == kRamp); 31 } 32 } 33 34 static void slow_check(const SkClampRange& range, 35 const SkGradFixed fx, SkGradFixed dx, int count) { 36 SkASSERT(range.fCount0 + range.fCount1 + range.fCount2 == count); 37 38 // If dx is large, fx will overflow if updated naively. So we use more bits. 39 int64_t bigfx = fx; 40 41 for (int i = 0; i < range.fCount0; i++) { 42 check_value(bigfx, range.fV0); 43 bigfx += dx; 44 } 45 46 for (int i = 0; i < range.fCount1; i++) { 47 check_value(bigfx, kRamp); 48 bigfx += dx; 49 } 50 51 for (int i = 0; i < range.fCount2; i++) { 52 check_value(bigfx, range.fV1); 53 bigfx += dx; 54 } 55 } 56 57 58 static void test_range(SkFixed fx, SkFixed dx, int count) { 59 const SkGradFixed gfx = SkFixedToGradFixed(fx); 60 const SkGradFixed gdx = SkFixedToGradFixed(dx); 61 62 SkClampRange range; 63 range.init(gfx, gdx, count, kV0, kV1); 64 slow_check(range, gfx, gdx, count); 65 } 66 67 #define ff(x) SkIntToFixed(x) 68 69 DEF_TEST(ClampRange, reporter) { 70 gReporter = reporter; 71 72 test_range(0, 0, 20); 73 test_range(0xFFFF, 0, 20); 74 test_range(-ff(2), 0, 20); 75 test_range( ff(2), 0, 20); 76 77 test_range(-10, 1, 20); 78 test_range(10, -1, 20); 79 test_range(-10, 3, 20); 80 test_range(10, -3, 20); 81 82 test_range(ff(1), ff(16384), 100); 83 test_range(ff(-1), ff(-16384), 100); 84 test_range(ff(1)/2, ff(16384), 100); 85 test_range(ff(1)/2, ff(-16384), 100); 86 87 SkRandom rand; 88 89 // test non-overflow cases 90 for (int i = 0; i < 1000000; i++) { 91 SkFixed fx = rand.nextS() >> 1; 92 SkFixed sx = rand.nextS() >> 1; 93 int count = rand.nextU() % 1000 + 1; 94 SkFixed dx = (sx - fx) / count; 95 test_range(fx, dx, count); 96 } 97 98 // TODO(reed): skia:2481, fix whatever bug this is, then uncomment 99 /* 100 // test overflow cases 101 for (int i = 0; i < 100000; i++) { 102 SkFixed fx = rand.nextS(); 103 SkFixed dx = rand.nextS(); 104 int count = rand.nextU() % 1000 + 1; 105 test_range(fx, dx, count); 106 } 107 */ 108 } 109
