From d6a65ba333ce3af34721e1452a1206233ac2a3e5 Mon Sep 17 00:00:00 2001
From: Jan Kiszka <jan.kiszka@siemens.com>
Date: Sat, 30 Jul 2011 11:39:16 +0200
Subject: [PATCH] sdl: Add zoom hot keys
Allow to enlarge or shrink the screen via CTRL-ALT-+/-. In contrast to
scaling the window, these controls always preserve the aspect ratio of
the current console.
CC: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
qemu-doc.texi | 8 ++++++++
ui/sdl.c | 13 +++++++++++++
2 files changed, 21 insertions(+)
diff --git a/qemu-doc.texi b/qemu-doc.texi
index 47e1991712..31199f6004 100644
--- a/qemu-doc.texi
+++ b/qemu-doc.texi
@@ -288,6 +288,14 @@ then the modifier is Ctrl-Alt-Shift (instead of Ctrl-Alt) and if you use
@kindex Ctrl-Alt-f
Toggle full screen
+@item Ctrl-Alt-+
+@kindex Ctrl-Alt-+
+Enlarge the screen
+
+@item Ctrl-Alt--
+@kindex Ctrl-Alt--
+Shrink the screen
+
@item Ctrl-Alt-u
@kindex Ctrl-Alt-u
Restore the screen's un-scaled dimensions
diff --git a/ui/sdl.c b/ui/sdl.c
index e8ac3bb65b..fc63c8eec5 100644
--- a/ui/sdl.c
+++ b/ui/sdl.c
@@ -651,6 +651,19 @@ static void sdl_refresh(DisplayState *ds)
absolute_mouse_grab();
}
break;
+ case 0x1b: /* '+' */
+ case 0x35: /* '-' */
+ if (!gui_fullscreen) {
+ int width = MAX(real_screen->w +
+ (keycode == 0x1b ? 50 : -50), 160);
+ int height = (ds_get_height(ds) * width) /
+ ds_get_width(ds);
+
+ sdl_scale(ds, width, height);
+ vga_hw_invalidate();
+ vga_hw_update();
+ gui_keysym = 1;
+ }
default:
break;
}