lokdialog: Implement hi-dpi support for the routed dialogs.

Change-Id: I770c605a049b7ac9c26c2773414eef8b6fc093a2

1 files changed, 22 insertions, 2 deletions

diff --git a/desktop/source/lib/init.cxx b/desktop/source/lib/init.cxx
index 5b5381c002fa..a8d5e87eed08 100644
--- a/desktop/source/lib/init.cxx
+++ b/desktop/source/lib/init.cxx
@@ -678,6 +678,11 @@ static void doc_paintWindow(LibreOfficeKitDocument* pThis, unsigned nLOKWindowId
                             const int nX, const int nY,
                             const int nWidth, const int nHeight);
 
+static void doc_paintWindowDPI(LibreOfficeKitDocument* pThis, unsigned nLOKWindowId, unsigned char* pBuffer,
+                               const int nX, const int nY,
+                               const int nWidth, const int nHeight,
+                               const double fDPIScale);
+
 static void doc_postWindow(LibreOfficeKitDocument* pThis, unsigned nLOKWindowId, int nAction);
 
 static char* doc_getPartInfo(LibreOfficeKitDocument* pThis, int nPart);
@@ -733,6 +738,7 @@ LibLODocument_Impl::LibLODocument_Impl(const uno::Reference <css::lang::XCompone
         m_pDocumentClass->getPartHash = doc_getPartHash;
 
         m_pDocumentClass->paintWindow = doc_paintWindow;
+        m_pDocumentClass->paintWindowDPI = doc_paintWindowDPI;
         m_pDocumentClass->postWindow = doc_postWindow;
 
         m_pDocumentClass->setViewLanguage = doc_setViewLanguage;
@@ -3566,11 +3572,20 @@ unsigned char* doc_renderFont(SAL_UNUSED_PARAMETER LibreOfficeKitDocument* /*pTh
     return nullptr;
 }
 
-static void doc_paintWindow(LibreOfficeKitDocument* /*pThis*/, unsigned nLOKWindowId,
+static void doc_paintWindow(LibreOfficeKitDocument* pThis, unsigned nLOKWindowId,
                             unsigned char* pBuffer,
                             const int nX, const int nY,
                             const int nWidth, const int nHeight)
 {
+    doc_paintWindowDPI(pThis, nLOKWindowId, pBuffer, nX, nY, nWidth, nHeight, 1.0);
+}
+
+static void doc_paintWindowDPI(LibreOfficeKitDocument* /*pThis*/, unsigned nLOKWindowId,
+                               unsigned char* pBuffer,
+                               const int nX, const int nY,
+                               const int nWidth, const int nHeight,
+                               const double fDPIScale)
+{
     SolarMutexGuard aGuard;
     if (gImpl)
         gImpl->maLastExceptionMsg.clear();
@@ -3582,6 +3597,11 @@ static void doc_paintWindow(LibreOfficeKitDocument* /*pThis*/, unsigned nLOKWind
         return;
     }
 
+    // Setup cairo to draw with the changed DPI scale (and return back to 1.0
+    // when the painting finishes)
+    comphelper::ScopeGuard dpiScaleGuard([]() { comphelper::LibreOfficeKit::setDPIScale(1.0); });
+    comphelper::LibreOfficeKit::setDPIScale(fDPIScale);
+
 #if defined(IOS)
 
     CGContextRef cgc = CGBitmapContextCreate(pBuffer, nWidth, nHeight, 8, nWidth*4, CGColorSpaceCreateDeviceRGB(), kCGImageAlphaNoneSkipFirst | kCGImageByteOrder32Little);
@@ -3615,7 +3635,7 @@ static void doc_paintWindow(LibreOfficeKitDocument* /*pThis*/, unsigned nLOKWind
     pDevice->SetOutputSizePixelScaleOffsetAndBuffer(Size(nWidth, nHeight), Fraction(1.0), Point(), pBuffer);
 
     MapMode aMapMode(pDevice->GetMapMode());
-    aMapMode.SetOrigin(Point(-nX, -nY));
+    aMapMode.SetOrigin(Point(-(nX / fDPIScale), -(nY / fDPIScale)));
     pDevice->SetMapMode(aMapMode);
 
     comphelper::LibreOfficeKit::setDialogPainting(true);