Flutter Impeller
skia_conversions_unittests.cc
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1 // Copyright 2013 The Flutter 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 #include "display_list/dl_color.h"
6 #include "display_list/dl_tile_mode.h"
7 #include "flutter/testing/testing.h"
8 #include "impeller/display_list/skia_conversions.h"
9 #include "impeller/geometry/scalar.h"
10 
11 namespace impeller {
12 namespace testing {
13 
14 TEST(SkiaConversionsTest, ToColor) {
15  // Create a color with alpha, red, green, and blue values that are all
16  // trivially divisible by 255 so that we can test the conversion results in
17  // correct scalar values.
18  // AARRGGBB
19  const flutter::DlColor color = flutter::DlColor(0x8040C020);
20  auto converted_color = skia_conversions::ToColor(color);
21 
22  ASSERT_TRUE(ScalarNearlyEqual(converted_color.alpha, 0x80 * (1.0f / 255)));
23  ASSERT_TRUE(ScalarNearlyEqual(converted_color.red, 0x40 * (1.0f / 255)));
24  ASSERT_TRUE(ScalarNearlyEqual(converted_color.green, 0xC0 * (1.0f / 255)));
25  ASSERT_TRUE(ScalarNearlyEqual(converted_color.blue, 0x20 * (1.0f / 255)));
26 }
27 
28 TEST(SkiaConversionsTest, GradientStopConversion) {
29  // Typical gradient.
30  std::vector<flutter::DlColor> colors = {flutter::DlColor::kBlue(),
31  flutter::DlColor::kRed(),
32  flutter::DlColor::kGreen()};
33  std::vector<float> stops = {0.0, 0.5, 1.0};
34  const auto gradient =
35  flutter::DlColorSource::MakeLinear(SkPoint::Make(0, 0), //
36  SkPoint::Make(1.0, 1.0), //
37  3, //
38  colors.data(), //
39  stops.data(), //
40  flutter::DlTileMode::kClamp, //
41  nullptr //
42  );
43 
44  std::vector<Color> converted_colors;
45  std::vector<Scalar> converted_stops;
46  skia_conversions::ConvertStops(gradient.get(), converted_colors,
47  converted_stops);
48 
49  ASSERT_TRUE(ScalarNearlyEqual(converted_stops[0], 0.0f));
50  ASSERT_TRUE(ScalarNearlyEqual(converted_stops[1], 0.5f));
51  ASSERT_TRUE(ScalarNearlyEqual(converted_stops[2], 1.0f));
52 }
53 
54 TEST(SkiaConversionsTest, GradientMissing0) {
55  std::vector<flutter::DlColor> colors = {flutter::DlColor::kBlue(),
56  flutter::DlColor::kRed()};
57  std::vector<float> stops = {0.5, 1.0};
58  const auto gradient =
59  flutter::DlColorSource::MakeLinear(SkPoint::Make(0, 0), //
60  SkPoint::Make(1.0, 1.0), //
61  2, //
62  colors.data(), //
63  stops.data(), //
64  flutter::DlTileMode::kClamp, //
65  nullptr //
66  );
67 
68  std::vector<Color> converted_colors;
69  std::vector<Scalar> converted_stops;
70  skia_conversions::ConvertStops(gradient.get(), converted_colors,
71  converted_stops);
72 
73  // First color is inserted as blue.
74  ASSERT_TRUE(ScalarNearlyEqual(converted_colors[0].blue, 1.0f));
75  ASSERT_TRUE(ScalarNearlyEqual(converted_stops[0], 0.0f));
76  ASSERT_TRUE(ScalarNearlyEqual(converted_stops[1], 0.5f));
77  ASSERT_TRUE(ScalarNearlyEqual(converted_stops[2], 1.0f));
78 }
79 
80 TEST(SkiaConversionsTest, GradientMissingLastValue) {
81  std::vector<flutter::DlColor> colors = {flutter::DlColor::kBlue(),
82  flutter::DlColor::kRed()};
83  std::vector<float> stops = {0.0, .5};
84  const auto gradient =
85  flutter::DlColorSource::MakeLinear(SkPoint::Make(0, 0), //
86  SkPoint::Make(1.0, 1.0), //
87  2, //
88  colors.data(), //
89  stops.data(), //
90  flutter::DlTileMode::kClamp, //
91  nullptr //
92  );
93 
94  std::vector<Color> converted_colors;
95  std::vector<Scalar> converted_stops;
96  skia_conversions::ConvertStops(gradient.get(), converted_colors,
97  converted_stops);
98 
99  // Last color is inserted as red.
100  ASSERT_TRUE(ScalarNearlyEqual(converted_colors[2].red, 1.0f));
101  ASSERT_TRUE(ScalarNearlyEqual(converted_stops[0], 0.0f));
102  ASSERT_TRUE(ScalarNearlyEqual(converted_stops[1], 0.5f));
103  ASSERT_TRUE(ScalarNearlyEqual(converted_stops[2], 1.0f));
104 }
105 
106 TEST(SkiaConversionsTest, GradientStopGreaterThan1) {
107  std::vector<flutter::DlColor> colors = {flutter::DlColor::kBlue(),
108  flutter::DlColor::kGreen(),
109  flutter::DlColor::kRed()};
110  std::vector<float> stops = {0.0, 100, 1.0};
111  const auto gradient =
112  flutter::DlColorSource::MakeLinear(SkPoint::Make(0, 0), //
113  SkPoint::Make(1.0, 1.0), //
114  3, //
115  colors.data(), //
116  stops.data(), //
117  flutter::DlTileMode::kClamp, //
118  nullptr //
119  );
120 
121  std::vector<Color> converted_colors;
122  std::vector<Scalar> converted_stops;
123  skia_conversions::ConvertStops(gradient.get(), converted_colors,
124  converted_stops);
125 
126  // Value is clamped to 1.0
127  ASSERT_TRUE(ScalarNearlyEqual(converted_stops[0], 0.0f));
128  ASSERT_TRUE(ScalarNearlyEqual(converted_stops[1], 1.0f));
129  ASSERT_TRUE(ScalarNearlyEqual(converted_stops[2], 1.0f));
130 }
131 
132 TEST(SkiaConversionsTest, GradientConversionNonMonotonic) {
133  std::vector<flutter::DlColor> colors = {
134  flutter::DlColor::kBlue(), flutter::DlColor::kGreen(),
135  flutter::DlColor::kGreen(), flutter::DlColor::kRed()};
136  std::vector<float> stops = {0.0, 0.5, 0.4, 1.0};
137  const auto gradient =
138  flutter::DlColorSource::MakeLinear(SkPoint::Make(0, 0), //
139  SkPoint::Make(1.0, 1.0), //
140  4, //
141  colors.data(), //
142  stops.data(), //
143  flutter::DlTileMode::kClamp, //
144  nullptr //
145  );
146 
147  std::vector<Color> converted_colors;
148  std::vector<Scalar> converted_stops;
149  skia_conversions::ConvertStops(gradient.get(), converted_colors,
150  converted_stops);
151 
152  // Value is clamped to 0.5
153  ASSERT_TRUE(ScalarNearlyEqual(converted_stops[0], 0.0f));
154  ASSERT_TRUE(ScalarNearlyEqual(converted_stops[1], 0.5f));
155  ASSERT_TRUE(ScalarNearlyEqual(converted_stops[2], 0.5f));
156  ASSERT_TRUE(ScalarNearlyEqual(converted_stops[3], 1.0f));
157 }
158 
159 } // namespace testing
160 } // namespace impeller
impeller::skia_conversions::ConvertStops
void ConvertStops(const flutter::DlGradientColorSourceBase *gradient, std::vector< Color > &colors, std::vector< float > &stops)
Convert display list colors + stops into impeller colors and stops, taking care to ensure that the st...
Definition: skia_conversions.cc:192
impeller::testing::TEST
TEST(AiksCanvasTest, EmptyCullRect)
Definition: canvas_unittests.cc:17
impeller::skia_conversions::ToColor
Color ToColor(const flutter::DlColor &color)
Definition: skia_conversions.cc:142
skia_conversions.h
scalar.h
impeller::ScalarNearlyEqual
constexpr bool ScalarNearlyEqual(Scalar x, Scalar y, Scalar tolerance=kEhCloseEnough)
Definition: scalar.h:27
impeller
Definition: aiks_context.cc:10