sd: slideshow render interface and implementation

Interface and implementation to expose the ability to render
the slide's layers to a bitmap.

Change-Id: I3da48585e498354592e163d84bd29659b233c255
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/170214
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/include/vcl/ITiledRenderable.hxx b/include/vcl/ITiledRenderable.hxx
index 483176aca3b8..05db0bad6db0 100644
--- a/include/vcl/ITiledRenderable.hxx
+++ b/include/vcl/ITiledRenderable.hxx
@@ -390,6 +390,24 @@ public:
     {
         return {};
     }
+    /** Creates a slide show renderer (Impress only function) */
+    virtual bool createSlideRenderer(
+        sal_Int32 /*nSlideNumber*/, sal_Int32& /*nViewWidth*/, sal_Int32& /*nViewHeight*/,
+        bool /*bRenderBackground*/, bool /*bRenderMasterPage*/)
+   {
+        return false;
+   }
+
+    /** Clean-up slideshow */
+    virtual void postSlideshowCleanup()
+    {
+    }
+
+    /** render slideshow layer*/
+    virtual bool renderNextSlideLayer(unsigned char* /*pBuffer*/, bool& /*bIsBitmapLayer*/, OUString& /*rJsonMsg*/)
+    {
+        return true;
+    }
 };
 } // namespace vcl