- screenshot: allow screenshots using external utility; most code is taken from TangoCash

Signed-off-by: Thilo Graf <dbt@novatux.de>

src/driver/screenshot.h

@@ -23,6 +23,14 @@
 #ifndef __screenshot_h_
 #define __screenshot_h_
 
+#ifdef SCREENSHOT
+  #if BOXMODEL_VUPLUS
+    #define SCREENSHOT_EXTERNAL 1
+  #else
+    #define SCREENSHOT_INTERNAL 1
+  #endif
+#endif
+
 #include <pthread.h>
 
 class CScreenShot
@@ -37,13 +45,15 @@ class CScreenShot
 	private:
 		screenshot_format_t format;
 		std::string filename;
-		unsigned char * pixel_data;
 		int xres;
 		int yres;
 		bool extra_osd;
 		bool get_osd;
 		bool get_video;
 		bool scale_to_video;
+
+#if SCREENSHOT_INTERNAL
+		unsigned char * pixel_data;
 		FILE *fd;
 		pthread_t  scs_thread;
 		pthread_mutex_t thread_mutex;
@@ -65,6 +75,7 @@ class CScreenShot
 #ifdef BOXMODEL_CS_HD2
 		bool mergeOsdScreen(uint32_t dx, uint32_t dy, fb_pixel_t* osdData);
 #endif
+#endif // SCREENSHOT_INTERNAL
 
 	public:
 		CScreenShot(const std::string fname = "", screenshot_format_t fmt = CScreenShot::FORMAT_JPG);