Add tests

Author: bdero

impeller/aiks/aiks_unittests.cc

@@ -18,7 +18,9 @@
 #include "impeller/aiks/paint_pass_delegate.h"
 #include "impeller/aiks/testing/context_spy.h"
 #include "impeller/entity/contents/color_source_contents.h"
+#include "impeller/entity/contents/conical_gradient_contents.h"
 #include "impeller/entity/contents/filters/inputs/filter_input.h"
+#include "impeller/entity/contents/linear_gradient_contents.h"
 #include "impeller/entity/contents/scene_contents.h"
 #include "impeller/entity/contents/solid_color_contents.h"
 #include "impeller/entity/contents/tiled_texture_contents.h"
@@ -2851,5 +2853,35 @@ TEST_P(AiksTest, CanCanvasDrawPicture) {
   ASSERT_TRUE(OpenPlaygroundHere(canvas.EndRecordingAsPicture()));
 }
 
+TEST_P(AiksTest, SolidColorApplyColorFilter) {
+  auto contents = SolidColorContents();
+  contents.SetColor(Color::CornflowerBlue().WithAlpha(0.75));
+  auto result = contents.ApplyColorFilter([](const Color& color) {
+    return color.Blend(Color::LimeGreen().WithAlpha(0.75), BlendMode::kScreen);
+  });
+  ASSERT_TRUE(result);
+  ASSERT_COLOR_NEAR(contents.GetColor(),
+                    Color(0.433247, 0.879523, 0.825324, 0.75));
+}
+
+#define APPLY_COLOR_FILTER_GRADIENT_TEST(name)                                 \
+  TEST_P(AiksTest, name##GradientApplyColorFilter) {                           \
+    auto contents = name##GradientContents();                                  \
+    contents.SetColors({Color::CornflowerBlue().WithAlpha(0.75)});             \
+    auto result = contents.ApplyColorFilter([](const Color& color) {           \
+      return color.Blend(Color::LimeGreen().WithAlpha(0.75),                   \
+                         BlendMode::kScreen);                                  \
+    });                                                                        \
+    ASSERT_TRUE(result);                                                       \
+                                                                               \
+    std::vector<Color> expected = {Color(0.433247, 0.879523, 0.825324, 0.75)}; \
+    ASSERT_COLORS_NEAR(contents.GetColors(), expected);                        \
+  }
+
+APPLY_COLOR_FILTER_GRADIENT_TEST(Linear);
+APPLY_COLOR_FILTER_GRADIENT_TEST(Radial);
+APPLY_COLOR_FILTER_GRADIENT_TEST(Conical);
+APPLY_COLOR_FILTER_GRADIENT_TEST(Sweep);
+
 }  // namespace testing
 }  // namespace impeller