The new functions cDevice::CanScaleVideo() and cDevice::ScaleVideo() can be used by derived output devices to implement scaling the video to a given size and location

CONTRIBUTORS

@@ -1776,6 +1776,8 @@ Lucian Muresan <lucianm@users.sourceforge.net>
  for reporting duplicate texts in i18n.c
  for suggesting to use 'gettext' for internationalization
  for exporting some libsi functions
+ for suggesting to add functions to cDevice that allow derived output devices to
+ implement scaling the video to a given size and location
 
 Mattias Gr<47>nlund <Mattias@Gronlund.net>
  for pointing out a missing cleanup at program exit in case there is a problem

HISTORY

@@ -7375,3 +7375,6 @@ Video Disk Recorder Revision History
 - Now always setting the TDT EIT filter, because otherwise when turning on using the
   transponder time in the Setup menu, it would only be used after the next restart
   of VDR (thanks to Sundararaj Reel).
+- The new functions cDevice::CanScaleVideo() and cDevice::ScaleVideo() can be used by
+  derived output devices to implement scaling the video to a given size and location
+  (based on a suggestion by Lucian Muresan).

device.h

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: device.h 2.41 2012/08/26 13:25:44 kls Exp $
+ * $Id: device.h 2.42 2012/12/04 11:52:58 kls Exp $
  */
 
 #ifndef __DEVICE_H
@@ -655,6 +655,33 @@ public:
   virtual bool IsPlayingVideo(void) const { return isPlayingVideo; }
        ///< \return Returns true if the currently attached player has delivered
        ///< any video packets.
+  virtual cRect CanScaleVideo(const cRect &Rect, int Alignment = taCenter) { return cRect::Null; }
+       ///< Asks the output device whether it can scale the currently shown video in
+       ///< such a way that it fits into the given Rect, while retaining its proper
+       ///< aspect ratio. If the scaled video doesn't exactly fit into Rect, Alignment
+       ///< is used to determine how to align the actual rectangle with the requested
+       ///< one. The actual rectangle can be smaller, larger or the same size as the
+       ///< given Rect, and its location may differ, depending on the capabilities of
+       ///< the output device, which may not be able to display a scaled video at
+       ///< arbitrary sizes and locations. The device shall, however, do its best to
+       ///< match the requested Rect as closely as possible, preferring a size and
+       ///< location that fits completely into the requested Rect if possible.
+       ///< Returns the rectangle that can actually be used when scaling the video.
+       ///< A skin plugin using this function should rearrange its content according
+       ///< to the rectangle returned from calling this function, and should especially
+       ///< be prepared for cases where the returned rectangle is way off the requested
+       ///< Rect, or even Null. In such cases, the skin may want to fall back to
+       ///< working with full screen video.
+       ///< If this device can't scale the video, a Null rectangle is returned (this
+       ///< is also the default implementation).
+  virtual void ScaleVideo(const cRect &Rect = cRect::Null) {}
+       ///< Scales the currently shown video in such a way that it fits into the given
+       ///< Rect. Rect should be one retrieved through a previous call to
+       ///< CanScaleVideo() (otherwise results may be undefined).
+       ///< Even if video output is scaled, the functions GetVideoSize() and
+       ///< GetOsdSize() must still return the same values as if in full screen mode!
+       ///< If this device can't scale the video, nothing happens.
+       ///< To restore full screen video, call this function with a Null rectangle.
   virtual bool HasIBPTrickSpeed(void) { return false; }
        ///< Returns true if this device can handle all frames in 'fast forward'
        ///< trick speeds.