tdf#127022 vcl: fix Windows RTL menu bar

Regression from commit e8d5b8beb5958147235ff955ed38c47b51d860ff
(tdf#113714 vcl menu bar window: avoid flicker, 2019-05-20), the problem
was that while the original render context has RTL set up correctly, the
intermediate virtual device had it disabled all the time.

Change-Id: Ic063c4a6c0537891c0bfceb8927edb97cf1c6e86
Reviewed-on: https://gerrit.libreoffice.org/85624
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins
Reviewed-on: https://gerrit.libreoffice.org/85636
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

4 files changed, 18 insertions, 1 deletions

diff --git a/vcl/CppunitTest_vcl_outdev.mk b/vcl/CppunitTest_vcl_outdev.mk
index f15d2e26d17d..65fd6b5fa17e 100644
--- a/vcl/CppunitTest_vcl_outdev.mk
+++ b/vcl/CppunitTest_vcl_outdev.mk
@@ -12,6 +12,7 @@ $(eval $(call gb_CppunitTest_CppunitTest,vcl_outdev))
 $(eval $(call gb_CppunitTest_set_include,vcl_outdev,\
     $$(INCLUDE) \
     -I$(SRCDIR)/vcl/inc \
+    -I$(SRCDIR)/vcl/source/window \
 ))
 
 $(eval $(call gb_CppunitTest_add_exception_objects,vcl_outdev, \
diff --git a/vcl/qa/cppunit/outdev.cxx b/vcl/qa/cppunit/outdev.cxx
index 8b2dd7c3a841..2f42412e75aa 100644
--- a/vcl/qa/cppunit/outdev.cxx
+++ b/vcl/qa/cppunit/outdev.cxx
@@ -16,6 +16,7 @@
 #include <vcl/gdimtf.hxx>
 #include <vcl/metaact.hxx>
 #include <bitmapwriteaccess.hxx>
+#include <bufferdevice.hxx>
 
 #include <basegfx/matrix/b2dhommatrix.hxx>
 
@@ -32,6 +33,7 @@ public:
     void testGetReadableFontColorWindow();
     void testDrawTransformedBitmapEx();
     void testDrawTransformedBitmapExFlip();
+    void testRTL();
 
     CPPUNIT_TEST_SUITE(VclOutdevTest);
     CPPUNIT_TEST(testVirtualDevice);
@@ -42,6 +44,7 @@ public:
     CPPUNIT_TEST(testGetReadableFontColorWindow);
     CPPUNIT_TEST(testDrawTransformedBitmapEx);
     CPPUNIT_TEST(testDrawTransformedBitmapExFlip);
+    CPPUNIT_TEST(testRTL);
     CPPUNIT_TEST_SUITE_END();
 };
 
@@ -254,6 +257,18 @@ void VclOutdevTest::testDrawTransformedBitmapExFlip()
     CPPUNIT_ASSERT_EQUAL_MESSAGE(ss.str(), COL_BLACK, Color(aColor));
 }
 
+void VclOutdevTest::testRTL()
+{
+    ScopedVclPtrInstance<vcl::Window> pWindow(nullptr, WB_APP | WB_STDWORK);
+    pWindow->EnableRTL();
+    vcl::RenderContext& rRenderContext = *pWindow;
+    vcl::BufferDevice pBuffer(pWindow, rRenderContext);
+
+    // Without the accompanying fix in place, this test would have failed, because the RTL status
+    // from pWindow was not propagated to pBuffer.
+    CPPUNIT_ASSERT(pBuffer->IsRTLEnabled());
+}
+
 CPPUNIT_TEST_SUITE_REGISTRATION(VclOutdevTest);
 
 CPPUNIT_PLUGIN_IMPLEMENT();
diff --git a/vcl/source/window/bufferdevice.cxx b/vcl/source/window/bufferdevice.cxx
index d1480588d48f..0092d1ab97e4 100644
--- a/vcl/source/window/bufferdevice.cxx
+++ b/vcl/source/window/bufferdevice.cxx
@@ -20,6 +20,7 @@ BufferDevice::BufferDevice(const VclPtr<vcl::Window>& pWindow, vcl::RenderContex
     m_pBuffer->SetTextColor(rRenderContext.GetTextColor());
     m_pBuffer->DrawOutDev(Point(0, 0), pWindow->GetOutputSizePixel(), Point(0, 0),
                           pWindow->GetOutputSizePixel(), rRenderContext);
+    m_pBuffer->EnableRTL(rRenderContext.IsRTLEnabled());
 }
 
 BufferDevice::~BufferDevice()
diff --git a/vcl/source/window/bufferdevice.hxx b/vcl/source/window/bufferdevice.hxx
index 26bf28e615fa..5f2471cd26d9 100644
--- a/vcl/source/window/bufferdevice.hxx
+++ b/vcl/source/window/bufferdevice.hxx
@@ -16,7 +16,7 @@
 namespace vcl
 {
 /// Buffers drawing on a vcl::RenderContext using a VirtualDevice.
-class BufferDevice
+class VCL_DLLPUBLIC BufferDevice
 {
     ScopedVclPtr<VirtualDevice> m_pBuffer;
     VclPtr<vcl::Window> m_pWindow;