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: 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>
---
 ui/sdl.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'ui/sdl.c')

diff --git a/ui/sdl.c b/ui/sdl.c
index e8ac3bb..fc63c8e 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;
                     }
-- 
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