ios/chrome/browser/ui/ui_util_unittest.mm

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #import "ios/chrome/browser/ui/ui_util.h"
   6
   7 #import <UIKit/UIKit.h>
   8
   9 #include "base/basictypes.h"
  10 #include "testing/gtest/include/gtest/gtest.h"
  11 #include "testing/gtest_mac.h"
  12
  13 TEST(UIUtilTest, AlignToPixel) {
  14   CGFloat scale = [[UIScreen mainScreen] scale];
  15   // Pick a few interesting values: already aligned, aligned on retina, and
  16   // some unaligned values that would round differently. Ensure that all are
  17   // "integer" values within <1 of the original value in the scaled space.
  18   CGFloat test_values[] = {10.0, 55.5, 3.14159, 2.71828};
  19   const CGFloat kMaxAlignDelta = 0.9999;
  20   size_t value_count = arraysize(test_values);
  21   for (unsigned int i = 0; i < value_count; ++i) {
  22     CGFloat aligned = AlignValueToPixel(test_values[i]);
  23     EXPECT_FLOAT_EQ(aligned * scale, floor(aligned * scale));
  24     EXPECT_NEAR(aligned * scale, test_values[i] * scale, kMaxAlignDelta);
  25
  26     CGFloat x = test_values[i];
  27     CGFloat y = test_values[(i + 1) % value_count];
  28     CGPoint alignedPoint = AlignPointToPixel(CGPointMake(x, y));
  29     EXPECT_FLOAT_EQ(floor(alignedPoint.x * scale), alignedPoint.x * scale);
  30     EXPECT_FLOAT_EQ(floor(alignedPoint.y * scale), alignedPoint.y * scale);
  31     EXPECT_NEAR(x * scale, alignedPoint.x * scale, kMaxAlignDelta);
  32     EXPECT_NEAR(y * scale, alignedPoint.y * scale, kMaxAlignDelta);
  33   }
  34 }
  35
  36 #define EXPECT_EQ_RECT(a, b) \
  37   EXPECT_NSEQ(NSStringFromCGRect(a), NSStringFromCGRect(b))
  38 #define EXPECT_EQ_SIZE(a, b) \
  39   EXPECT_NSEQ(NSStringFromCGSize(a), NSStringFromCGSize(b))
  40
  41 TEST(UIUtilTest, TestProjectionWithoutPreservingAspectRatio) {
  42   CGSize originalSize, targetSize, expectedRevisedSize, revisedSize;
  43   CGRect expectedProjection, projection;
  44
  45   // Resize with same aspect ratio.
  46   originalSize = CGSizeMake(100, 100);
  47   targetSize = CGSizeMake(50, 50);
  48   expectedRevisedSize = targetSize;
  49   expectedProjection = CGRectMake(0, 0, 50, 50);
  50   CalculateProjection(originalSize, targetSize, NO, NO, revisedSize,
  51                       projection);
  52   EXPECT_EQ_RECT(expectedProjection, projection);
  53   EXPECT_EQ_SIZE(expectedRevisedSize, revisedSize);
  54
  55   // Resize with different aspect ratio.
  56   originalSize = CGSizeMake(100, 100);
  57   targetSize = CGSizeMake(60, 40);
  58   expectedRevisedSize = targetSize;
  59   expectedProjection = CGRectMake(0, 0, 60, 40);
  60   CalculateProjection(originalSize, targetSize, NO, NO, revisedSize,
  61                       projection);
  62   EXPECT_EQ_RECT(expectedProjection, projection);
  63   EXPECT_EQ_SIZE(expectedRevisedSize, revisedSize);
  64
  65   // Stretch the other way.
  66   originalSize = CGSizeMake(100, 100);
  67   targetSize = CGSizeMake(40, 60);
  68   expectedRevisedSize = targetSize;
  69   expectedProjection = CGRectMake(0, 0, 40, 60);
  70   CalculateProjection(originalSize, targetSize, NO, NO, revisedSize,
  71                       projection);
  72   EXPECT_EQ_RECT(expectedProjection, projection);
  73   EXPECT_EQ_SIZE(expectedRevisedSize, revisedSize);
  74 }
  75
  76 TEST(UIUtilTest, TestProjectionPreservingAspectRatioWithoutClip) {
  77   CGSize originalSize, targetSize, expectedRevisedSize, revisedSize;
  78   CGRect expectedProjection, projection;
  79
  80   // Landscape resize to 50x50, but squeezed into 50x25.
  81   originalSize = CGSizeMake(100, 50);
  82   targetSize = CGSizeMake(50, 50);
  83   expectedRevisedSize = CGSizeMake(50, 25);
  84   expectedProjection = CGRectMake(0, 0, 50, 25);
  85   CalculateProjection(originalSize, targetSize, YES, NO, revisedSize,
  86                       projection);
  87   EXPECT_EQ_RECT(expectedProjection, projection);
  88   EXPECT_EQ_SIZE(expectedRevisedSize, revisedSize);
  89
  90   // Landscape resize to 60x40, but squeezed into 60x30.
  91   originalSize = CGSizeMake(100, 50);
  92   targetSize = CGSizeMake(60, 40);
  93   expectedRevisedSize = CGSizeMake(60, 30);
  94   expectedProjection = CGRectMake(0, 0, 60, 30);
  95   CalculateProjection(originalSize, targetSize, YES, NO, revisedSize,
  96                       projection);
  97   EXPECT_EQ_RECT(expectedProjection, projection);
  98   EXPECT_EQ_SIZE(expectedRevisedSize, revisedSize);
  99
 100   // Landscape resize to 40x60, but squeezed into 40x20.
 101   originalSize = CGSizeMake(100, 50);
 102   targetSize = CGSizeMake(40, 60);
 103   expectedRevisedSize = CGSizeMake(40, 20);
 104   expectedProjection = CGRectMake(0, 0, 40, 20);
 105   CalculateProjection(originalSize, targetSize, YES, NO, revisedSize,
 106                       projection);
 107   EXPECT_EQ_RECT(expectedProjection, projection);
 108   EXPECT_EQ_SIZE(expectedRevisedSize, revisedSize);
 109
 110   // Portrait resize to 50x50, but squeezed into 25x50.
 111   originalSize = CGSizeMake(50, 100);
 112   targetSize = CGSizeMake(50, 50);
 113   expectedRevisedSize = CGSizeMake(25, 50);
 114   expectedProjection = CGRectMake(0, 0, 25, 50);
 115   CalculateProjection(originalSize, targetSize, YES, NO, revisedSize,
 116                       projection);
 117   EXPECT_EQ_RECT(expectedProjection, projection);
 118   EXPECT_EQ_SIZE(expectedRevisedSize, revisedSize);
 119
 120   // Portrait resize to 60x40, but squeezed into 20x40.
 121   originalSize = CGSizeMake(50, 100);
 122   targetSize = CGSizeMake(60, 40);
 123   expectedRevisedSize = CGSizeMake(20, 40);
 124   expectedProjection = CGRectMake(0, 0, 20, 40);
 125   CalculateProjection(originalSize, targetSize, YES, NO, revisedSize,
 126                       projection);
 127   EXPECT_EQ_RECT(expectedProjection, projection);
 128   EXPECT_EQ_SIZE(expectedRevisedSize, revisedSize);
 129
 130   // Portrait resize to 40x60, but squeezed into 30x60.
 131   originalSize = CGSizeMake(50, 100);
 132   targetSize = CGSizeMake(40, 60);
 133   expectedRevisedSize = CGSizeMake(30, 60);
 134   expectedProjection = CGRectMake(0, 0, 30, 60);
 135   CalculateProjection(originalSize, targetSize, YES, NO, revisedSize,
 136                       projection);
 137   EXPECT_EQ_RECT(expectedProjection, projection);
 138   EXPECT_EQ_SIZE(expectedRevisedSize, revisedSize);
 139 }
 140
 141 TEST(UIUtilTest, TestProjectionPreservingAspectRatioWithClip) {
 142   CGSize originalSize, targetSize, expectedRevisedSize, revisedSize;
 143   CGRect expectedProjection, projection;
 144
 145   // Landscape resize to 50x50
 146   originalSize = CGSizeMake(100, 50);
 147   targetSize = CGSizeMake(50, 50);
 148   expectedRevisedSize = targetSize;
 149   expectedProjection = CGRectMake(-25, 0, 100, 50);
 150   CalculateProjection(originalSize, targetSize, YES, YES, revisedSize,
 151                       projection);
 152   EXPECT_EQ_RECT(expectedProjection, projection);
 153   EXPECT_EQ_SIZE(expectedRevisedSize, revisedSize);
 154
 155   // Landscape resize to 60x40, but squeezed into 60x30.
 156   originalSize = CGSizeMake(100, 50);
 157   targetSize = CGSizeMake(60, 40);
 158   expectedRevisedSize = targetSize;
 159   expectedProjection = CGRectMake(-10, 0, 80, 40);
 160   CalculateProjection(originalSize, targetSize, YES, YES, revisedSize,
 161                       projection);
 162   EXPECT_EQ_RECT(expectedProjection, projection);
 163   EXPECT_EQ_SIZE(expectedRevisedSize, revisedSize);
 164
 165   // Landscape resize to 40x60, but squeezed into 40x20.
 166   originalSize = CGSizeMake(100, 50);
 167   targetSize = CGSizeMake(40, 60);
 168   expectedRevisedSize = targetSize;
 169   expectedProjection = CGRectMake(-40, 0, 120, 60);
 170   CalculateProjection(originalSize, targetSize, YES, YES, revisedSize,
 171                       projection);
 172   EXPECT_EQ_RECT(expectedProjection, projection);
 173   EXPECT_EQ_SIZE(expectedRevisedSize, revisedSize);
 174
 175   // Portrait resize to 50x50, but squeezed into 25x50.
 176   originalSize = CGSizeMake(50, 100);
 177   targetSize = CGSizeMake(50, 50);
 178   expectedRevisedSize = targetSize;
 179   expectedProjection = CGRectMake(0, -25, 50, 100);
 180   CalculateProjection(originalSize, targetSize, YES, YES, revisedSize,
 181                       projection);
 182   EXPECT_EQ_RECT(expectedProjection, projection);
 183   EXPECT_EQ_SIZE(expectedRevisedSize, revisedSize);
 184
 185   // Portrait resize to 60x40, but clipped to 20x40.
 186   originalSize = CGSizeMake(50, 100);
 187   targetSize = CGSizeMake(60, 40);
 188   expectedRevisedSize = targetSize;
 189   expectedProjection = CGRectMake(0, -40, 60, 120);
 190   CalculateProjection(originalSize, targetSize, YES, YES, revisedSize,
 191                       projection);
 192   EXPECT_EQ_RECT(expectedProjection, projection);
 193   EXPECT_EQ_SIZE(expectedRevisedSize, revisedSize);
 194
 195   // Portrait resize to 40x60, but clipped to 30x60.
 196   originalSize = CGSizeMake(50, 100);
 197   targetSize = CGSizeMake(40, 60);
 198   expectedRevisedSize = targetSize;
 199   expectedProjection = CGRectMake(0, -10, 40, 80);
 200   CalculateProjection(originalSize, targetSize, YES, YES, revisedSize,
 201                       projection);
 202   EXPECT_EQ_RECT(expectedProjection, projection);
 203   EXPECT_EQ_SIZE(expectedRevisedSize, revisedSize);
 204 }