From 22e0bcc01fd84f0bd05a9ad2f15019314ed2679a Mon Sep 17 00:00:00 2001
From: Thomas Bernard <miniupnp@free.fr>
Date: Tue, 19 Jun 2018 12:14:33 +0200
Subject: [PATCH] introduce GFX2_UpdateScreen()

---
 src/input.c     |  8 +++++++-
 src/screen.h    |  4 ++++
 src/sdlscreen.c | 16 +++++++++++++---
 3 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/src/input.c b/src/input.c
index c7d15223..898820c4 100644
--- a/src/input.c
+++ b/src/input.c
@@ -1093,11 +1093,17 @@ int Get_input(int sleep_time)
     {
       Compute_paintbrush_coordinates();
       Display_cursor();
+#if defined(USE_SDL2)
+      //GFX2_UpdateScreen();
+#endif
       return 1;
     }
     if (user_feedback_required)
       return 1;
-    
+
+#if defined(USE_SDL2)
+    GFX2_UpdateScreen();
+#endif
     // Nothing significant happened
     if (sleep_time)
       SDL_Delay(sleep_time);
diff --git a/src/screen.h b/src/screen.h
index baffe2a4..6a04fbbf 100644
--- a/src/screen.h
+++ b/src/screen.h
@@ -57,4 +57,8 @@ extern volatile int Allow_colorcycling;
 /// Activates or desactivates file drag-dropping in program window.
 void Allow_drag_and_drop(int flag);
 
+#if defined(USE_SDL2)
+void GFX2_UpdateScreen(void);
+#endif
+
 #endif // SCREEN_H_INCLUDED
diff --git a/src/sdlscreen.c b/src/sdlscreen.c
index 29e6fed6..8d659f72 100644
--- a/src/sdlscreen.c
+++ b/src/sdlscreen.c
@@ -178,8 +178,13 @@ static void GFX2_UpdateRect(int x, int y, int width, int height)
 
   source_rect.x = x;
   source_rect.y = y;
-  source_rect.w = width;
-  source_rect.h = height;
+  if (width == 0 && height == 0) {
+    source_rect.w = Screen_SDL->w;
+    source_rect.h = Screen_SDL->h;
+  } else {
+    source_rect.w = width;
+    source_rect.h = height;
+  }
 
   if  (RGBcopy == NULL)
   {
@@ -196,7 +201,12 @@ static void GFX2_UpdateRect(int x, int y, int width, int height)
      memcpy(pixels + line * pitch, RGBcopy->pixels + source_rect.x * 4 + (source_rect.y+line)* RGBcopy->pitch, source_rect.w * 4 );
   }
   SDL_UnlockTexture(Texture_SDL);
-  SDL_RenderCopy(Renderer_SDL, Texture_SDL, &source_rect, &source_rect);
+  //SDL_RenderCopy(Renderer_SDL, Texture_SDL, &source_rect, &source_rect);
+}
+
+void GFX2_UpdateScreen(void)
+{
+  SDL_RenderCopy(Renderer_SDL, Texture_SDL, NULL, NULL);
   SDL_RenderPresent(Renderer_SDL);
 }
 #endif