Again add ability to change tint/shade of a color + unit test

Change-Id: I4c06290f09e5bfecd2c1de896e19cb5036a3a0e9

2 files changed, 86 insertions, 0 deletions

diff --git a/tools/qa/cppunit/test_color.cxx b/tools/qa/cppunit/test_color.cxx
index 99f311fc5a4c..aeab12a1adb1 100644
--- a/tools/qa/cppunit/test_color.cxx
+++ b/tools/qa/cppunit/test_color.cxx
@@ -23,10 +23,12 @@ class Test: public CppUnit::TestFixture
 public:
     void test_asRGBColor();
     void test_readAndWriteStream();
+    void test_ApplyTintOrShade();
 
     CPPUNIT_TEST_SUITE(Test);
     CPPUNIT_TEST(test_asRGBColor);
     CPPUNIT_TEST(test_readAndWriteStream);
+    CPPUNIT_TEST(test_ApplyTintOrShade);
     CPPUNIT_TEST_SUITE_END();
 };
 
@@ -76,6 +78,64 @@ void Test::test_readAndWriteStream()
     }
 }
 
+bool checkTintShade(sal_uInt8 nR, sal_uInt8 nG, sal_uInt8 nB, OUString sReference, sal_Int16 nTintShade, OUString sExpected)
+{
+    Color aColor(nR, nG, nB);
+    if (sReference != aColor.AsRGBHexString())
+        return false;
+    aColor.ApplyTintOrShade(nTintShade);
+    return sExpected == aColor.AsRGBHexString();
+}
+
+void Test::test_ApplyTintOrShade()
+{
+    // BLACK reference
+
+    // 5% tint
+    CPPUNIT_ASSERT(checkTintShade(0x00, 0x00, 0x00, "000000",  500, "0d0d0d"));
+    // 15% tint
+    CPPUNIT_ASSERT(checkTintShade(0x00, 0x00, 0x00, "000000",  1500, "262626"));
+    // 25% tint
+    CPPUNIT_ASSERT(checkTintShade(0x00, 0x00, 0x00, "000000",  2500, "404040"));
+    // 50% tint
+    CPPUNIT_ASSERT(checkTintShade(0x00, 0x00, 0x00, "000000",  5000, "808080"));
+    // 100% tint
+    CPPUNIT_ASSERT(checkTintShade(0x00, 0x00, 0x00, "000000", 10000, "ffffff"));
+
+    // WHITE reference
+
+    // 5% shade
+    CPPUNIT_ASSERT(checkTintShade(0xff, 0xff, 0xff, "ffffff",   -500, "f2f2f2"));
+    // 15% shade
+    CPPUNIT_ASSERT(checkTintShade(0xff, 0xff, 0xff, "ffffff",  -1500, "d9d9d9"));
+    // 25% shade
+    CPPUNIT_ASSERT(checkTintShade(0xff, 0xff, 0xff, "ffffff",  -2500, "bfbfbf"));
+    // 50% shade
+    CPPUNIT_ASSERT(checkTintShade(0xff, 0xff, 0xff, "ffffff",  -5000, "808080"));
+    // 100% shade
+    CPPUNIT_ASSERT(checkTintShade(0xff, 0xff, 0xff, "ffffff", -10000, "000000"));
+
+    // GREY reference
+
+    // 0% - no change
+    CPPUNIT_ASSERT(checkTintShade(0x80, 0x80, 0x80, "808080",      0, "808080"));
+
+    // 25% tint
+    CPPUNIT_ASSERT(checkTintShade(0x80, 0x80, 0x80, "808080",   2500, "a0a0a0"));
+    // 50% tint
+    CPPUNIT_ASSERT(checkTintShade(0x80, 0x80, 0x80, "808080",   5000, "c0c0c0"));
+    // 100% tint
+    CPPUNIT_ASSERT(checkTintShade(0x80, 0x80, 0x80, "808080",  10000, "ffffff"));
+
+    // 25% shade
+    CPPUNIT_ASSERT(checkTintShade(0x80, 0x80, 0x80, "808080",  -2500, "606060"));
+    // 50% shade
+    CPPUNIT_ASSERT(checkTintShade(0x80, 0x80, 0x80, "808080",  -5000, "404040"));
+    // 100% shade
+    CPPUNIT_ASSERT(checkTintShade(0x80, 0x80, 0x80, "808080", -10000, "000000"));
+
+}
+
 CPPUNIT_TEST_SUITE_REGISTRATION(Test);
 
 }
diff --git a/tools/source/generic/color.cxx b/tools/source/generic/color.cxx
index 07fdd00fd7c4..4ab32d471ea1 100644
--- a/tools/source/generic/color.cxx
+++ b/tools/source/generic/color.cxx
@@ -312,6 +312,32 @@ SvStream& ReadColor( SvStream& rIStream, Color& rColor )
     return rIStream;
 }
 
+void Color::ApplyTintOrShade(sal_Int16 n100thPercent)
+{
+    if (n100thPercent == 0)
+        return;
+
+    basegfx::BColor aBColor = basegfx::tools::rgb2hsl(getBColor());
+    double fFactor = 1.0 - (std::abs(double(n100thPercent)) / 10000.0);
+    double fResult;
+
+    if (n100thPercent > 0) // tint
+    {
+        fResult = aBColor.getBlue() * fFactor + (1.0 - fFactor);
+    }
+    else if (n100thPercent < 0) // shade
+    {
+        fResult = aBColor.getBlue() * fFactor;
+    }
+
+    aBColor.setBlue(fResult);
+    aBColor = basegfx::tools::hsl2rgb(aBColor);
+
+    SetRed(sal_uInt8((  aBColor.getRed()   * 255.0) + 0.5));
+    SetGreen(sal_uInt8((aBColor.getGreen() * 255.0) + 0.5));
+    SetBlue(sal_uInt8(( aBColor.getBlue()  * 255.0) + 0.5));
+}
+
 SvStream& WriteColor( SvStream& rOStream, const Color& rColor )
 {
     DBG_ASSERTWARNING( rOStream.GetVersion(), "Color::<< - Solar-Version not set on rOStream" );