vcl: test greyscale bitmap conversion functions

Change-Id: I9a71bcbc0bac0bdd4a401b129a7abd55eb43c910
Reviewed-on: https://gerrit.libreoffice.org/50399
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

1 files changed, 96 insertions, 1 deletions

diff --git a/vcl/qa/cppunit/BitmapTest.cxx b/vcl/qa/cppunit/BitmapTest.cxx
index 726ce8bf524e..5af967052326 100644
--- a/vcl/qa/cppunit/BitmapTest.cxx
+++ b/vcl/qa/cppunit/BitmapTest.cxx
@@ -35,6 +35,8 @@ class BitmapTest : public CppUnit::TestFixture
     void testCreation();
     void testEmpty();
     void testMonochrome();
+    void testN4Greyscale();
+    void testN8Greyscale();
     void testConvert();
     void testScale();
     void testCRC();
@@ -45,6 +47,8 @@ class BitmapTest : public CppUnit::TestFixture
     CPPUNIT_TEST(testEmpty);
     CPPUNIT_TEST(testMonochrome);
     CPPUNIT_TEST(testConvert);
+    CPPUNIT_TEST(testN4Greyscale);
+    CPPUNIT_TEST(testN8Greyscale);
     CPPUNIT_TEST(testScale);
     CPPUNIT_TEST(testCRC);
     CPPUNIT_TEST(testGreyPalette);
@@ -170,7 +174,7 @@ void BitmapTest::testEmpty()
     CPPUNIT_ASSERT(aBitmap.IsEmpty());
 }
 
-void BitmapTest::testMonochrome()
+const Bitmap createTestBitmap()
 {
     Bitmap aBmp(Size(4, 4), 24);
     BitmapWriteAccess aBmpAccess(aBmp);
@@ -199,6 +203,13 @@ void BitmapTest::testMonochrome()
     aBmpAccess.SetPixel(3, 2, BitmapColor(COL_YELLOW));
     aBmpAccess.SetPixel(3, 3, BitmapColor(COL_WHITE));
 
+    return aBmp;
+}
+
+void BitmapTest::testMonochrome()
+{
+    Bitmap aBmp = createTestBitmap();
+
     aBmp.MakeMonochrome(63);
     BitmapReadAccess aBmpReadAccess(aBmp);
 
@@ -236,6 +247,90 @@ void BitmapTest::testMonochrome()
                                  aBmpReadAccess.GetColor(3, 3));
 }
 
+void BitmapTest::testN4Greyscale()
+{
+    Bitmap aBmp = createTestBitmap();
+    BitmapPalette aGreyscalePalette = Bitmap::GetGreyPalette(16);
+
+    aBmp.Convert(BmpConversion::N4BitGreys);
+    BitmapReadAccess aBmpReadAccess(aBmp);
+
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Black pixel wrong 8-bit greyscale value", aGreyscalePalette[0],
+                                 aBmpReadAccess.GetColor(0, 0));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Blue pixel wrong 8-bit greyscale value", aGreyscalePalette[0],
+                                 aBmpReadAccess.GetColor(0, 1));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Green pixel wrong 8-bit greyscale value", aGreyscalePalette[4],
+                                 aBmpReadAccess.GetColor(0, 2));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Cyan pixel wrong 8-bit greyscale value", aGreyscalePalette[5],
+                                 aBmpReadAccess.GetColor(0, 3));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Red pixel wrong 8-bit greyscale value", aGreyscalePalette[2],
+                                 aBmpReadAccess.GetColor(1, 0));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Magenta pixel wrong 8-bit greyscale value", aGreyscalePalette[3],
+                                 aBmpReadAccess.GetColor(1, 1));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Brown pixel wrong 8-bit greyscale value", aGreyscalePalette[7],
+                                 aBmpReadAccess.GetColor(1, 2));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Gray pixel wrong 8-bit greyscale value", aGreyscalePalette[8],
+                                 aBmpReadAccess.GetColor(1, 3));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Light gray pixel wrong 8-bit greyscale value",
+                                 aGreyscalePalette[12], aBmpReadAccess.GetColor(2, 0));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Light blue pixel wrong 8-bit greyscale value",
+                                 aGreyscalePalette[1], aBmpReadAccess.GetColor(2, 1));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Light green pixel wrong 8-bit greyscale value",
+                                 aGreyscalePalette[9], aBmpReadAccess.GetColor(2, 2));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Light cyan pixel wrong 8-bit greyscale value",
+                                 aGreyscalePalette[11], aBmpReadAccess.GetColor(2, 3));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Light red pixel wrong 8-bit greyscale value",
+                                 aGreyscalePalette[4], aBmpReadAccess.GetColor(3, 0));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Light magenta pixel wrong 8-bit greyscale value",
+                                 aGreyscalePalette[6], aBmpReadAccess.GetColor(3, 1));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Yellow pixel wrong 8-bit greyscale value", aGreyscalePalette[14],
+                                 aBmpReadAccess.GetColor(3, 2));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("White pixel wrong 8-bit greyscale value", aGreyscalePalette[15],
+                                 aBmpReadAccess.GetColor(3, 3));
+}
+
+void BitmapTest::testN8Greyscale()
+{
+    Bitmap aBmp = createTestBitmap();
+    BitmapPalette aGreyscalePalette = Bitmap::GetGreyPalette(256);
+
+    aBmp.Convert(BmpConversion::N8BitGreys);
+    BitmapReadAccess aBmpReadAccess(aBmp);
+
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Black pixel wrong 8-bit greyscale value", aGreyscalePalette[0],
+                                 aBmpReadAccess.GetColor(0, 0));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Blue pixel wrong 8-bit greyscale value", aGreyscalePalette[14],
+                                 aBmpReadAccess.GetColor(0, 1));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Green pixel wrong 8-bit greyscale value", aGreyscalePalette[75],
+                                 aBmpReadAccess.GetColor(0, 2));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Cyan pixel wrong 8-bit greyscale value", aGreyscalePalette[89],
+                                 aBmpReadAccess.GetColor(0, 3));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Red pixel wrong 8-bit greyscale value", aGreyscalePalette[38],
+                                 aBmpReadAccess.GetColor(1, 0));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Magenta pixel wrong 8-bit greyscale value", aGreyscalePalette[52],
+                                 aBmpReadAccess.GetColor(1, 1));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Brown pixel wrong 8-bit greyscale value", aGreyscalePalette[114],
+                                 aBmpReadAccess.GetColor(1, 2));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Gray pixel wrong 8-bit greyscale value", aGreyscalePalette[128],
+                                 aBmpReadAccess.GetColor(1, 3));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Light gray pixel wrong 8-bit greyscale value",
+                                 aGreyscalePalette[192], aBmpReadAccess.GetColor(2, 0));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Light blue pixel wrong 8-bit greyscale value",
+                                 aGreyscalePalette[27], aBmpReadAccess.GetColor(2, 1));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Light green pixel wrong 8-bit greyscale value",
+                                 aGreyscalePalette[150], aBmpReadAccess.GetColor(2, 2));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Light cyan pixel wrong 8-bit greyscale value",
+                                 aGreyscalePalette[178], aBmpReadAccess.GetColor(2, 3));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Light red pixel wrong 8-bit greyscale value",
+                                 aGreyscalePalette[76], aBmpReadAccess.GetColor(3, 0));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Light magenta pixel wrong 8-bit greyscale value",
+                                 aGreyscalePalette[104], aBmpReadAccess.GetColor(3, 1));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Yellow pixel wrong 8-bit greyscale value", aGreyscalePalette[227],
+                                 aBmpReadAccess.GetColor(3, 2));
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("White pixel wrong 8-bit greyscale value", aGreyscalePalette[255],
+                                 aBmpReadAccess.GetColor(3, 3));
+}
+
 void BitmapTest::testConvert()
 {
     Bitmap aBitmap(Size(10, 10), 8);