third_party/WebKit/Source/platform/LayoutUnitTest.cpp

   1 /*
   2  * Copyright (c) 2012, Google Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
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   9  * notice, this list of conditions and the following disclaimer.
  10  *     * Redistributions in binary form must reproduce the above
  11  * copyright notice, this list of conditions and the following disclaimer
  12  * in the documentation and/or other materials provided with the
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  14  *     * Neither the name of Google Inc. nor the names of its
  15  * contributors may be used to endorse or promote products derived from
  16  * this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include "config.h"
  32 #include "platform/LayoutUnit.h"
  33
  34 #include <gtest/gtest.h>
  35 #include <limits.h>
  36
  37 namespace blink {
  38
  39 TEST(LayoutUnitTest, LayoutUnitInt)
  40 {
  41     EXPECT_EQ(intMinForLayoutUnit, LayoutUnit(INT_MIN).toInt());
  42     EXPECT_EQ(intMinForLayoutUnit, LayoutUnit(INT_MIN / 2).toInt());
  43     EXPECT_EQ(intMinForLayoutUnit, LayoutUnit(intMinForLayoutUnit - 1).toInt());
  44     EXPECT_EQ(intMinForLayoutUnit, LayoutUnit(intMinForLayoutUnit).toInt());
  45     EXPECT_EQ(intMinForLayoutUnit + 1, LayoutUnit(intMinForLayoutUnit + 1).toInt());
  46     EXPECT_EQ(intMinForLayoutUnit / 2, LayoutUnit(intMinForLayoutUnit / 2).toInt());
  47     EXPECT_EQ(-10000, LayoutUnit(-10000).toInt());
  48     EXPECT_EQ(-1000, LayoutUnit(-1000).toInt());
  49     EXPECT_EQ(-100, LayoutUnit(-100).toInt());
  50     EXPECT_EQ(-10, LayoutUnit(-10).toInt());
  51     EXPECT_EQ(-1, LayoutUnit(-1).toInt());
  52     EXPECT_EQ(0, LayoutUnit(0).toInt());
  53     EXPECT_EQ(1, LayoutUnit(1).toInt());
  54     EXPECT_EQ(100, LayoutUnit(100).toInt());
  55     EXPECT_EQ(1000, LayoutUnit(1000).toInt());
  56     EXPECT_EQ(10000, LayoutUnit(10000).toInt());
  57     EXPECT_EQ(intMaxForLayoutUnit / 2, LayoutUnit(intMaxForLayoutUnit / 2).toInt());
  58     EXPECT_EQ(intMaxForLayoutUnit - 1, LayoutUnit(intMaxForLayoutUnit - 1).toInt());
  59     EXPECT_EQ(intMaxForLayoutUnit, LayoutUnit(intMaxForLayoutUnit).toInt());
  60     EXPECT_EQ(intMaxForLayoutUnit, LayoutUnit(intMaxForLayoutUnit + 1).toInt());
  61     EXPECT_EQ(intMaxForLayoutUnit, LayoutUnit(INT_MAX / 2).toInt());
  62     EXPECT_EQ(intMaxForLayoutUnit, LayoutUnit(INT_MAX).toInt());
  63 }
  64
  65 TEST(LayoutUnitTest, LayoutUnitFloat)
  66 {
  67     const float tolerance = 1.0f / kFixedPointDenominator;
  68     EXPECT_FLOAT_EQ(1.0f, LayoutUnit(1.0f).toFloat());
  69     EXPECT_FLOAT_EQ(1.25f, LayoutUnit(1.25f).toFloat());
  70     EXPECT_NEAR(LayoutUnit(1.1f).toFloat(), 1.1f, tolerance);
  71     EXPECT_NEAR(LayoutUnit(1.33f).toFloat(), 1.33f, tolerance);
  72     EXPECT_NEAR(LayoutUnit(1.3333f).toFloat(), 1.3333f, tolerance);
  73     EXPECT_NEAR(LayoutUnit(1.53434f).toFloat(), 1.53434f, tolerance);
  74     EXPECT_NEAR(LayoutUnit(345634).toFloat(), 345634.0f, tolerance);
  75     EXPECT_NEAR(LayoutUnit(345634.12335f).toFloat(), 345634.12335f, tolerance);
  76     EXPECT_NEAR(LayoutUnit(-345634.12335f).toFloat(), -345634.12335f, tolerance);
  77     EXPECT_NEAR(LayoutUnit(-345634).toFloat(), -345634.0f, tolerance);
  78 }
  79
  80 TEST(LayoutUnitTest, LayoutUnitRounding)
  81 {
  82     EXPECT_EQ(-2, LayoutUnit(-1.9f).round());
  83     EXPECT_EQ(-2, LayoutUnit(-1.6f).round());
  84     EXPECT_EQ(-2, LayoutUnit::fromFloatRound(-1.51f).round());
  85     EXPECT_EQ(-1, LayoutUnit::fromFloatRound(-1.5f).round());
  86     EXPECT_EQ(-1, LayoutUnit::fromFloatRound(-1.49f).round());
  87     EXPECT_EQ(-1, LayoutUnit(-1.0f).round());
  88     EXPECT_EQ(-1, LayoutUnit::fromFloatRound(-0.99f).round());
  89     EXPECT_EQ(-1, LayoutUnit::fromFloatRound(-0.51f).round());
  90     EXPECT_EQ(0, LayoutUnit::fromFloatRound(-0.50f).round());
  91     EXPECT_EQ(0, LayoutUnit::fromFloatRound(-0.49f).round());
  92     EXPECT_EQ(0, LayoutUnit(-0.1f).round());
  93     EXPECT_EQ(0, LayoutUnit(0.0f).round());
  94     EXPECT_EQ(0, LayoutUnit(0.1f).round());
  95     EXPECT_EQ(0, LayoutUnit::fromFloatRound(0.49f).round());
  96     EXPECT_EQ(1, LayoutUnit::fromFloatRound(0.50f).round());
  97     EXPECT_EQ(1, LayoutUnit::fromFloatRound(0.51f).round());
  98     EXPECT_EQ(1, LayoutUnit(0.99f).round());
  99     EXPECT_EQ(1, LayoutUnit(1.0f).round());
 100     EXPECT_EQ(1, LayoutUnit::fromFloatRound(1.49f).round());
 101     EXPECT_EQ(2, LayoutUnit::fromFloatRound(1.5f).round());
 102     EXPECT_EQ(2, LayoutUnit::fromFloatRound(1.51f).round());
 103 }
 104
 105 TEST(LayoutUnitTest, LayoutUnitSnapSizeToPixel)
 106 {
 107     EXPECT_EQ(1, snapSizeToPixel(LayoutUnit(1), LayoutUnit(0)));
 108     EXPECT_EQ(1, snapSizeToPixel(LayoutUnit(1), LayoutUnit(0.5)));
 109     EXPECT_EQ(2, snapSizeToPixel(LayoutUnit(1.5), LayoutUnit(0)));
 110     EXPECT_EQ(2, snapSizeToPixel(LayoutUnit(1.5), LayoutUnit(0.49)));
 111     EXPECT_EQ(1, snapSizeToPixel(LayoutUnit(1.5), LayoutUnit(0.5)));
 112     EXPECT_EQ(1, snapSizeToPixel(LayoutUnit(1.5), LayoutUnit(0.75)));
 113     EXPECT_EQ(1, snapSizeToPixel(LayoutUnit(1.5), LayoutUnit(0.99)));
 114     EXPECT_EQ(2, snapSizeToPixel(LayoutUnit(1.5), LayoutUnit(1)));
 115
 116     EXPECT_EQ(0, snapSizeToPixel(LayoutUnit(0.5), LayoutUnit(1.5)));
 117     EXPECT_EQ(0, snapSizeToPixel(LayoutUnit(0.99), LayoutUnit(1.5)));
 118     EXPECT_EQ(1, snapSizeToPixel(LayoutUnit(1.0), LayoutUnit(1.5)));
 119     EXPECT_EQ(1, snapSizeToPixel(LayoutUnit(1.49), LayoutUnit(1.5)));
 120     EXPECT_EQ(1, snapSizeToPixel(LayoutUnit(1.5), LayoutUnit(1.5)));
 121
 122     EXPECT_EQ(101, snapSizeToPixel(LayoutUnit(100.5), LayoutUnit(100)));
 123     EXPECT_EQ(intMaxForLayoutUnit, snapSizeToPixel(LayoutUnit(intMaxForLayoutUnit), LayoutUnit(0.3)));
 124     EXPECT_EQ(intMinForLayoutUnit, snapSizeToPixel(LayoutUnit(intMinForLayoutUnit), LayoutUnit(-0.3)));
 125 }
 126
 127 TEST(LayoutUnitTest, LayoutUnitMultiplication)
 128 {
 129     EXPECT_EQ(1, (LayoutUnit(1) * LayoutUnit(1)).toInt());
 130     EXPECT_EQ(2, (LayoutUnit(1) * LayoutUnit(2)).toInt());
 131     EXPECT_EQ(2, (LayoutUnit(2) * LayoutUnit(1)).toInt());
 132     EXPECT_EQ(1, (LayoutUnit(2) * LayoutUnit(0.5)).toInt());
 133     EXPECT_EQ(1, (LayoutUnit(0.5) * LayoutUnit(2)).toInt());
 134     EXPECT_EQ(100, (LayoutUnit(100) * LayoutUnit(1)).toInt());
 135
 136     EXPECT_EQ(-1, (LayoutUnit(-1) * LayoutUnit(1)).toInt());
 137     EXPECT_EQ(-2, (LayoutUnit(-1) * LayoutUnit(2)).toInt());
 138     EXPECT_EQ(-2, (LayoutUnit(-2) * LayoutUnit(1)).toInt());
 139     EXPECT_EQ(-1, (LayoutUnit(-2) * LayoutUnit(0.5)).toInt());
 140     EXPECT_EQ(-1, (LayoutUnit(-0.5) * LayoutUnit(2)).toInt());
 141     EXPECT_EQ(-100, (LayoutUnit(-100) * LayoutUnit(1)).toInt());
 142
 143     EXPECT_EQ(1, (LayoutUnit(-1) * LayoutUnit(-1)).toInt());
 144     EXPECT_EQ(2, (LayoutUnit(-1) * LayoutUnit(-2)).toInt());
 145     EXPECT_EQ(2, (LayoutUnit(-2) * LayoutUnit(-1)).toInt());
 146     EXPECT_EQ(1, (LayoutUnit(-2) * LayoutUnit(-0.5)).toInt());
 147     EXPECT_EQ(1, (LayoutUnit(-0.5) * LayoutUnit(-2)).toInt());
 148     EXPECT_EQ(100, (LayoutUnit(-100) * LayoutUnit(-1)).toInt());
 149
 150     EXPECT_EQ(333, (LayoutUnit(100) * LayoutUnit(3.33)).round());
 151     EXPECT_EQ(-333, (LayoutUnit(-100) * LayoutUnit(3.33)).round());
 152     EXPECT_EQ(333, (LayoutUnit(-100) * LayoutUnit(-3.33)).round());
 153
 154     size_t aHundredSizeT = 100;
 155     EXPECT_EQ(100, (LayoutUnit(aHundredSizeT) * LayoutUnit(1)).toInt());
 156     EXPECT_EQ(400, (aHundredSizeT * LayoutUnit(4)).toInt());
 157     EXPECT_EQ(400, (LayoutUnit(4) * aHundredSizeT).toInt());
 158
 159     int quarterMax = intMaxForLayoutUnit / 4;
 160     EXPECT_EQ(quarterMax * 2, (LayoutUnit(quarterMax) * LayoutUnit(2)).toInt());
 161     EXPECT_EQ(quarterMax * 3, (LayoutUnit(quarterMax) * LayoutUnit(3)).toInt());
 162     EXPECT_EQ(quarterMax * 4, (LayoutUnit(quarterMax) * LayoutUnit(4)).toInt());
 163     EXPECT_EQ(intMaxForLayoutUnit, (LayoutUnit(quarterMax) * LayoutUnit(5)).toInt());
 164
 165     size_t overflowIntSizeT = intMaxForLayoutUnit * 4;
 166     EXPECT_EQ(intMaxForLayoutUnit, (LayoutUnit(overflowIntSizeT) * LayoutUnit(2)).toInt());
 167     EXPECT_EQ(intMaxForLayoutUnit, (overflowIntSizeT * LayoutUnit(4)).toInt());
 168     EXPECT_EQ(intMaxForLayoutUnit, (LayoutUnit(4) * overflowIntSizeT).toInt());
 169 }
 170
 171 TEST(LayoutUnitTest, LayoutUnitDivision)
 172 {
 173     EXPECT_EQ(1, (LayoutUnit(1) / LayoutUnit(1)).toInt());
 174     EXPECT_EQ(0, (LayoutUnit(1) / LayoutUnit(2)).toInt());
 175     EXPECT_EQ(2, (LayoutUnit(2) / LayoutUnit(1)).toInt());
 176     EXPECT_EQ(4, (LayoutUnit(2) / LayoutUnit(0.5)).toInt());
 177     EXPECT_EQ(0, (LayoutUnit(0.5) / LayoutUnit(2)).toInt());
 178     EXPECT_EQ(10, (LayoutUnit(100) / LayoutUnit(10)).toInt());
 179     EXPECT_FLOAT_EQ(0.5f, (LayoutUnit(1) / LayoutUnit(2)).toFloat());
 180     EXPECT_FLOAT_EQ(0.25f, (LayoutUnit(0.5) / LayoutUnit(2)).toFloat());
 181
 182     EXPECT_EQ(-1, (LayoutUnit(-1) / LayoutUnit(1)).toInt());
 183     EXPECT_EQ(0, (LayoutUnit(-1) / LayoutUnit(2)).toInt());
 184     EXPECT_EQ(-2, (LayoutUnit(-2) / LayoutUnit(1)).toInt());
 185     EXPECT_EQ(-4, (LayoutUnit(-2) / LayoutUnit(0.5)).toInt());
 186     EXPECT_EQ(0, (LayoutUnit(-0.5) / LayoutUnit(2)).toInt());
 187     EXPECT_EQ(-10, (LayoutUnit(-100) / LayoutUnit(10)).toInt());
 188     EXPECT_FLOAT_EQ(-0.5f, (LayoutUnit(-1) / LayoutUnit(2)).toFloat());
 189     EXPECT_FLOAT_EQ(-0.25f, (LayoutUnit(-0.5) / LayoutUnit(2)).toFloat());
 190
 191     EXPECT_EQ(1, (LayoutUnit(-1) / LayoutUnit(-1)).toInt());
 192     EXPECT_EQ(0, (LayoutUnit(-1) / LayoutUnit(-2)).toInt());
 193     EXPECT_EQ(2, (LayoutUnit(-2) / LayoutUnit(-1)).toInt());
 194     EXPECT_EQ(4, (LayoutUnit(-2) / LayoutUnit(-0.5)).toInt());
 195     EXPECT_EQ(0, (LayoutUnit(-0.5) / LayoutUnit(-2)).toInt());
 196     EXPECT_EQ(10, (LayoutUnit(-100) / LayoutUnit(-10)).toInt());
 197     EXPECT_FLOAT_EQ(0.5f, (LayoutUnit(-1) / LayoutUnit(-2)).toFloat());
 198     EXPECT_FLOAT_EQ(0.25f, (LayoutUnit(-0.5) / LayoutUnit(-2)).toFloat());
 199
 200     size_t aHundredSizeT = 100;
 201     EXPECT_EQ(50, (LayoutUnit(aHundredSizeT) / LayoutUnit(2)).toInt());
 202     EXPECT_EQ(25, (aHundredSizeT / LayoutUnit(4)).toInt());
 203     EXPECT_EQ(4, (LayoutUnit(400) / aHundredSizeT).toInt());
 204
 205     EXPECT_EQ(intMaxForLayoutUnit / 2, (LayoutUnit(intMaxForLayoutUnit) / LayoutUnit(2)).toInt());
 206     EXPECT_EQ(intMaxForLayoutUnit, (LayoutUnit(intMaxForLayoutUnit) / LayoutUnit(0.5)).toInt());
 207 }
 208
 209 TEST(LayoutUnitTest, LayoutUnitCeil)
 210 {
 211     EXPECT_EQ(0, LayoutUnit(0).ceil());
 212     EXPECT_EQ(1, LayoutUnit(0.1).ceil());
 213     EXPECT_EQ(1, LayoutUnit(0.5).ceil());
 214     EXPECT_EQ(1, LayoutUnit(0.9).ceil());
 215     EXPECT_EQ(1, LayoutUnit(1.0).ceil());
 216     EXPECT_EQ(2, LayoutUnit(1.1).ceil());
 217
 218     EXPECT_EQ(0, LayoutUnit(-0.1).ceil());
 219     EXPECT_EQ(0, LayoutUnit(-0.5).ceil());
 220     EXPECT_EQ(0, LayoutUnit(-0.9).ceil());
 221     EXPECT_EQ(-1, LayoutUnit(-1.0).ceil());
 222
 223     EXPECT_EQ(intMaxForLayoutUnit, LayoutUnit(intMaxForLayoutUnit).ceil());
 224     EXPECT_EQ(intMaxForLayoutUnit, (LayoutUnit(intMaxForLayoutUnit) - LayoutUnit(0.5)).ceil());
 225     EXPECT_EQ(intMaxForLayoutUnit - 1, (LayoutUnit(intMaxForLayoutUnit) - LayoutUnit(1)).ceil());
 226
 227     EXPECT_EQ(intMinForLayoutUnit, LayoutUnit(intMinForLayoutUnit).ceil());
 228 }
 229
 230 TEST(LayoutUnitTest, LayoutUnitFloor)
 231 {
 232     EXPECT_EQ(0, LayoutUnit(0).floor());
 233     EXPECT_EQ(0, LayoutUnit(0.1).floor());
 234     EXPECT_EQ(0, LayoutUnit(0.5).floor());
 235     EXPECT_EQ(0, LayoutUnit(0.9).floor());
 236     EXPECT_EQ(1, LayoutUnit(1.0).floor());
 237     EXPECT_EQ(1, LayoutUnit(1.1).floor());
 238
 239     EXPECT_EQ(-1, LayoutUnit(-0.1).floor());
 240     EXPECT_EQ(-1, LayoutUnit(-0.5).floor());
 241     EXPECT_EQ(-1, LayoutUnit(-0.9).floor());
 242     EXPECT_EQ(-1, LayoutUnit(-1.0).floor());
 243
 244     EXPECT_EQ(intMaxForLayoutUnit, LayoutUnit(intMaxForLayoutUnit).floor());
 245
 246     EXPECT_EQ(intMinForLayoutUnit, LayoutUnit(intMinForLayoutUnit).floor());
 247     EXPECT_EQ(intMinForLayoutUnit, (LayoutUnit(intMinForLayoutUnit) + LayoutUnit(0.5)).floor());
 248     EXPECT_EQ(intMinForLayoutUnit + 1, (LayoutUnit(intMinForLayoutUnit) + LayoutUnit(1)).floor());
 249 }
 250
 251 TEST(LayoutUnitTest, LayoutUnitFloatOverflow)
 252 {
 253     // These should overflow to the max/min according to their sign.
 254     EXPECT_EQ(intMaxForLayoutUnit, LayoutUnit(176972000.0f).toInt());
 255     EXPECT_EQ(intMinForLayoutUnit, LayoutUnit(-176972000.0f).toInt());
 256     EXPECT_EQ(intMaxForLayoutUnit, LayoutUnit(176972000.0).toInt());
 257     EXPECT_EQ(intMinForLayoutUnit, LayoutUnit(-176972000.0).toInt());
 258 }
 259
 260 } // namespace blink