tdf#92194 - fix headless masking operations in vcl.

These were causing horrible rendering artifacts for all manner of
headless rendering across Android & Online.

A very simple fix in vcl, plus a set of tests.

Change-Id: Ib261c0ea29d79ee6415e164c0b9b098efb52458b

1 files changed, 64 insertions, 2 deletions

diff --git a/basebmp/test/bmpmasktest.cxx b/basebmp/test/bmpmasktest.cxx
index f123823cd78a..4b643072f7ec 100644
--- a/basebmp/test/bmpmasktest.cxx
+++ b/basebmp/test/bmpmasktest.cxx
@@ -17,8 +17,6 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
-// autogenerated file with codegen.pl
-
 #include <cppunit/TestAssert.h>
 #include <cppunit/TestFixture.h>
 #include <cppunit/extensions/HelperMacros.h>
@@ -142,6 +140,7 @@ public:
 
     void testBmpBasics()
     {
+        // mpDevice1bpp has a black rect. 0x0 -> 6x10
         implTestBmpBasics( mpDevice1bpp, mpBmp1bpp );
         implTestBmpBasics( mpDevice32bpp, mpBmp32bpp );
     }
@@ -152,11 +151,74 @@ public:
         implTestBmpScaledClip( mpDevice32bpp, mpBmp32bpp );
     }
 
+    void testMasking()
+    {
+        BitmapDeviceSharedPtr xOutput;
+        BitmapDeviceSharedPtr xBitmap;
+        BitmapDeviceSharedPtr xMask;
+
+        { // mpMask & mpBitmap
+            const basegfx::B2ISize aSize(5, 5);
+            std::vector< basebmp::Color > aDevPal;
+            aDevPal.push_back( basebmp::Color( 0, 0, 0 ) );
+            aDevPal.push_back( basebmp::Color( 0xff, 0xff, 0xff ) );
+
+            basebmp::Format nFormat;
+
+            nFormat = Format::OneBitMsbPal;
+//            nFormat = Format::OneBitMsbGrey; // FIXME - un-comment me to crash hard.
+            xMask = createBitmapDevice( aSize, false /* bTopDown */,
+                                        nFormat,
+                                         basebmp::getBitmapDeviceStrideForWidth( nFormat, aSize.getX()),
+                                         PaletteMemorySharedVector(
+                                                new std::vector< basebmp::Color >(aDevPal) ) );
+            // wipe to copy everything.
+            xMask->clear( basebmp::Color( 0x00, 0x00, 0x00 ) );
+
+            // punch out another piece not to copy
+            basegfx::B2DPolyPolygon aPoly;
+            basegfx::tools::importFromSvgD( aPoly, "m 2 2 h4 v8 h-4z",
+                                            false, NULL );
+            xMask->fillPolyPolygon( aPoly, basebmp::Color( 0xff, 0xff, 0xff ),
+                                    DrawMode::Paint );
+
+            xBitmap = createBitmapDevice( aSize, false,
+                                          Format::ThirtyTwoBitTcMaskBGRX,
+                                          basebmp::getBitmapDeviceStrideForWidth(
+                                                Format::ThirtyTwoBitTcMaskBGRX, aSize.getX()) );
+            xBitmap->clear(Color(0x80808080));
+        }
+        { // mpOutput & mpBitmap
+            const basegfx::B2ISize aSize(9, 9);
+            xOutput = createBitmapDevice( aSize, false,
+                                          Format::ThirtyTwoBitTcMaskBGRX,
+                                          basebmp::getBitmapDeviceStrideForWidth(
+                                                Format::ThirtyTwoBitTcMaskBGRX, aSize.getX()) );
+            xOutput->clear(Color(0xffffffff));
+        }
+
+        const basegfx::B2IBox aSourceRect(0,0,4,4);
+        const basegfx::B2IBox aDestAll(2,2,7,7);
+
+        xOutput->drawMaskedBitmap(
+            xBitmap, xMask,
+            aSourceRect, aDestAll,
+            DrawMode::Paint );
+
+        CPPUNIT_ASSERT_MESSAGE( "output not cleared to white",
+                                xOutput->getPixelData( basegfx::B2IPoint( 0, 0 ) ) == 0xffffff );
+        CPPUNIT_ASSERT_MESSAGE( "bitmap not drawn",
+                                xOutput->getPixelData( basegfx::B2IPoint( 2, 2 ) ) == 0x808080 );
+        CPPUNIT_ASSERT_MESSAGE( "mask not applied",
+                                xOutput->getPixelData( basegfx::B2IPoint( 6, 6 ) ) == 0xffffff );
+    }
+
     // Change the following lines only, if you add, remove or rename
     // member functions of the current class,
     // because these macros are need by auto register mechanism.
 
     CPPUNIT_TEST_SUITE(BmpMaskTest);
+    CPPUNIT_TEST(testMasking);
     CPPUNIT_TEST(testBmpBasics);
     CPPUNIT_TEST(testBmpClip);
     CPPUNIT_TEST_SUITE_END();