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

Change-Id: I770c605a049b7ac9c26c2773414eef8b6fc093a2
Reviewed-on: https://gerrit.libreoffice.org/63032
Tested-by: Jenkins
Reviewed-by: Jan Holesovsky <kendy@collabora.com>

2 files changed, 19 insertions, 3 deletions

diff --git a/include/LibreOfficeKit/LibreOfficeKit.h b/include/LibreOfficeKit/LibreOfficeKit.h
index e052765ac794..27d968c4a6b7 100644
--- a/include/LibreOfficeKit/LibreOfficeKit.h
+++ b/include/LibreOfficeKit/LibreOfficeKit.h
@@ -309,6 +309,15 @@ struct _LibreOfficeKitDocumentClass
     /// @see lok::Document::getPartInfo().
     char* (*getPartInfo) (LibreOfficeKitDocument* pThis, int nPart);
 
+    /// Paints window with given id to the buffer with the give DPI scale
+    /// (every pixel is dpiscale-times larger).
+    /// @see lok::Document::paintWindow().
+    void (*paintWindowDPI) (LibreOfficeKitDocument* pThis, unsigned nWindowId,
+                            unsigned char* pBuffer,
+                            const int x, const int y,
+                            const int width, const int height,
+                            const double dpiscale);
+
 #ifdef IOS
     /// @see lok::Document::paintTileToCGContext().
     void (*paintTileToCGContext) (LibreOfficeKitDocument* pThis,
diff --git a/include/LibreOfficeKit/LibreOfficeKit.hxx b/include/LibreOfficeKit/LibreOfficeKit.hxx
index c238d507c183..4a0ec6784b7b 100644
--- a/include/LibreOfficeKit/LibreOfficeKit.hxx
+++ b/include/LibreOfficeKit/LibreOfficeKit.hxx
@@ -164,16 +164,23 @@ public:
      * @param y y-coordinate from where the dialog should start painting
      * @param width The width of the dialog image to be painted
      * @param height The height of the dialog image to be painted
+     * @param dpiscale The dpi scale value used by the client.  Please note
+     *                 that the x, y, width, height are supposed to be the
+     *                 values with dpiscale applied (ie. dialog covering
+     *                 100x100 "normal" pixels with dpiscale '2' will have
+     *                 200x200 width x height), so that it is easy to compute
+     *                 the buffer sizes etc.
      */
     void paintWindow(unsigned nWindowId,
                      unsigned char* pBuffer,
                      const int x,
                      const int y,
                      const int width,
-                     const int height)
+                     const int height,
+                     const double dpiscale = 1.0)
     {
-        return mpDoc->pClass->paintWindow(mpDoc, nWindowId, pBuffer,
-                                          x, y, width, height);
+        return mpDoc->pClass->paintWindowDPI(mpDoc, nWindowId, pBuffer,
+                                             x, y, width, height, dpiscale);
     }
 
     /**