third_party/WebKit/Source/platform/transforms/TransformTestHelper.h

   1 // Copyright 2015 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 #ifndef TransformTestHelper_h
   6 #define TransformTestHelper_h
   7
   8 #include "platform/PlatformExport.h"
   9 #include "platform/transforms/TransformationMatrix.h"
  10 #include "wtf/text/WTFString.h"
  11
  12 #include <gtest/gtest.h>
  13
  14 // This file should only be included in test source files.
  15
  16 #define EXPECT_TRANSFORMS_ALMOST_EQ(a, b) \
  17     EXPECT_PRED_FORMAT2(::blink::TransformTestHelper::transformsAreAlmostEqual, a, b)
  18 #define ASSERT_TRANSFORMS_ALMOST_EQ(a, b) \
  19     ASSERT_PRED_FORMAT2(::blink::TransformTestHelper::transformsAreAlmostEqual, a, b)
  20
  21 namespace blink {
  22 namespace TransformTestHelper {
  23
  24 // These are helpers for the macros above.
  25
  26 bool floatsAreAlmostEqual(float a, float b)
  27 {
  28     // This trick was taken from ui/gfx/test/gfx_util.cc.
  29     return ::testing::FloatLE("a", "b", a, b) && ::testing::FloatLE("b", "a", b, a);
  30 }
  31
  32 String transformationMatrixToString(const TransformationMatrix& matrix)
  33 {
  34     return String::format(
  35         "(row-major) [ [ %.2f %.2f %.2f %.2f ] [ %.2f %.2f %.2f %.2f ] [ %.2f %.2f %.2f %.2f ] [ %.2f %.2f %.2f %.2f ] ]",
  36         matrix.m11(), matrix.m21(), matrix.m31(), matrix.m41(),
  37         matrix.m12(), matrix.m22(), matrix.m32(), matrix.m42(),
  38         matrix.m13(), matrix.m23(), matrix.m33(), matrix.m43(),
  39         matrix.m14(), matrix.m24(), matrix.m34(), matrix.m44());
  40 }
  41
  42 const TransformationMatrix& toTransformationMatrix(const TransformationMatrix& matrix) { return matrix; }
  43
  44 TransformationMatrix toTransformationMatrix(const SkMatrix44& skMatrix44)
  45 {
  46     TransformationMatrix matrix;
  47     matrix.setMatrix(
  48         skMatrix44.getDouble(0, 0),
  49         skMatrix44.getDouble(1, 0),
  50         skMatrix44.getDouble(2, 0),
  51         skMatrix44.getDouble(3, 0),
  52         skMatrix44.getDouble(0, 1),
  53         skMatrix44.getDouble(1, 1),
  54         skMatrix44.getDouble(2, 1),
  55         skMatrix44.getDouble(3, 1),
  56         skMatrix44.getDouble(0, 2),
  57         skMatrix44.getDouble(1, 2),
  58         skMatrix44.getDouble(2, 2),
  59         skMatrix44.getDouble(3, 2),
  60         skMatrix44.getDouble(0, 3),
  61         skMatrix44.getDouble(1, 3),
  62         skMatrix44.getDouble(2, 3),
  63         skMatrix44.getDouble(3, 3));
  64     return matrix;
  65 }
  66
  67 template <typename T1, typename T2>
  68 ::testing::AssertionResult transformsAreAlmostEqual(
  69     const char* lhsExpr, const char* rhsExpr,
  70     const T1& lhs, const T2& rhs)
  71 {
  72     return transformsAreAlmostEqual(lhsExpr, rhsExpr, toTransformationMatrix(lhs), toTransformationMatrix(rhs));
  73 }
  74
  75 template <>
  76 ::testing::AssertionResult transformsAreAlmostEqual(
  77     const char* lhsExpr, const char* rhsExpr,
  78     const TransformationMatrix& lhs, const TransformationMatrix& rhs)
  79 {
  80     if (lhs == rhs)
  81         return ::testing::AssertionSuccess();
  82
  83     if (floatsAreAlmostEqual(lhs.m11(), rhs.m11())
  84         && floatsAreAlmostEqual(lhs.m12(), rhs.m12())
  85         && floatsAreAlmostEqual(lhs.m13(), rhs.m13())
  86         && floatsAreAlmostEqual(lhs.m14(), rhs.m14())
  87         && floatsAreAlmostEqual(lhs.m21(), rhs.m21())
  88         && floatsAreAlmostEqual(lhs.m22(), rhs.m22())
  89         && floatsAreAlmostEqual(lhs.m23(), rhs.m23())
  90         && floatsAreAlmostEqual(lhs.m24(), rhs.m24())
  91         && floatsAreAlmostEqual(lhs.m31(), rhs.m31())
  92         && floatsAreAlmostEqual(lhs.m32(), rhs.m32())
  93         && floatsAreAlmostEqual(lhs.m33(), rhs.m33())
  94         && floatsAreAlmostEqual(lhs.m34(), rhs.m34())
  95         && floatsAreAlmostEqual(lhs.m41(), rhs.m41())
  96         && floatsAreAlmostEqual(lhs.m42(), rhs.m42())
  97         && floatsAreAlmostEqual(lhs.m43(), rhs.m43())
  98         && floatsAreAlmostEqual(lhs.m44(), rhs.m44()))
  99         return ::testing::AssertionSuccess();
 100
 101     return ::testing::AssertionFailure()
 102         << "Value of: " << rhsExpr
 103         << "\n  Actual: " << transformationMatrixToString(rhs).ascii().data()
 104         << "\nExpected: " << lhsExpr
 105         << "\nWhich is: " << transformationMatrixToString(lhs).ascii().data();
 106 }
 107
 108 } // namespace TransformTestHelper
 109 } // namespace blink
 110
 111 #endif // TransformTestHelper_h