third_party/WebKit/Source/core/style/FilterOperationsTest.cpp

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
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#include "core/style/FilterOperations.h"

#include "platform/geometry/IntRect.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace blink {

TEST(FilterOperationsTest, mapRectNoFilter) {
  FilterOperations ops;
  EXPECT_FALSE(ops.HasFilterThatMovesPixels());
  EXPECT_EQ(FloatRect(0, 0, 10, 10), ops.MapRect(FloatRect(0, 0, 10, 10)));
}

TEST(FilterOperationsTest, mapRectBlur) {
  FilterOperations ops;
  ops.Operations().push_back(BlurFilterOperation::Create(Length(20.0, kFixed)));
  EXPECT_TRUE(ops.HasFilterThatMovesPixels());
  EXPECT_EQ(IntRect(-57, -57, 124, 124),
            EnclosingIntRect(ops.MapRect(FloatRect(0, 0, 10, 10))));
}

TEST(FilterOperationsTest, mapRectDropShadow) {
  FilterOperations ops;
  ops.Operations().push_back(DropShadowFilterOperation::Create(ShadowData(
      FloatPoint(3, 8), 20, 0, kNormal, StyleColor(Color(1, 2, 3)))));
  EXPECT_TRUE(ops.HasFilterThatMovesPixels());
  EXPECT_EQ(IntRect(-54, -49, 124, 124),
            EnclosingIntRect(ops.MapRect(FloatRect(0, 0, 10, 10))));
}

TEST(FilterOperationsTest, mapRectBoxReflect) {
  FilterOperations ops;
  ops.Operations().push_back(BoxReflectFilterOperation::Create(
      BoxReflection(BoxReflection::kVerticalReflection, 100)));
  EXPECT_TRUE(ops.HasFilterThatMovesPixels());

  // original IntRect(0, 0, 10, 10) + reflection IntRect(90, 90, 10, 10)
  EXPECT_EQ(FloatRect(0, 0, 10, 100), ops.MapRect(FloatRect(0, 0, 10, 10)));
}

TEST(FilterOperationsTest, mapRectDropShadowAndBoxReflect) {
  // This is a case where the order of filter operations matters, and it's
  // important that the bounds be filtered in the correct order.
  FilterOperations ops;
  ops.Operations().push_back(DropShadowFilterOperation::Create(ShadowData(
      FloatPoint(100, 200), 0, 0, kNormal, StyleColor(Color::kBlack))));
  ops.Operations().push_back(BoxReflectFilterOperation::Create(
      BoxReflection(BoxReflection::kVerticalReflection, 50)));
  EXPECT_TRUE(ops.HasFilterThatMovesPixels());
  EXPECT_EQ(FloatRect(0, -160, 110, 370), ops.MapRect(FloatRect(0, 0, 10, 10)));
}

}  // namespace blink