From: Sasha Levin <levinsasha928@gmail.com>
Date: Thu, 9 Jun 2011 20:48:17 +0000 (-0400)
Subject: kvm tools: Use double buffering with SDL
X-Git-Tag: next-20110824~3^2~209
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7ae6095e5c1b28b4efc88056fea7fdd75e1fd82b;p=karo-tx-linux.git

kvm tools: Use double buffering with SDL

Page flip every time we copy the buffer over instead of invalidating
rects.
This should improve performance by letting hardware do the page
flipping.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---

diff --git a/tools/kvm/ui/sdl.c b/tools/kvm/ui/sdl.c
index bf2f7c9888ff..aa3eff910267 100644
--- a/tools/kvm/ui/sdl.c
+++ b/tools/kvm/ui/sdl.c
@@ -91,7 +91,7 @@ static void *sdl__thread(void *p)
 	if (!guest_screen)
 		die("Unable to create SDL RBG surface");
 
-	flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL;
+	flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL | SDL_DOUBLEBUF;
 
 	screen = SDL_SetVideoMode(fb->width, fb->height, fb->depth, flags);
 	if (!screen)
@@ -99,7 +99,7 @@ static void *sdl__thread(void *p)
 
 	for (;;) {
 		SDL_BlitSurface(guest_screen, NULL, screen, NULL);
-		SDL_UpdateRect(screen, 0, 0, 0, 0);
+		SDL_Flip(screen);
 
 		while (SDL_PollEvent(&ev)) {
 			switch (ev.type) {