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sdl: Add zoom hot keys

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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>
This commit is contained in:
Jan Kiszka 2011-07-30 11:39:16 +02:00 committed by Anthony Liguori
parent 35b0f23720
commit d6a65ba333
2 changed files with 21 additions and 0 deletions
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8
qemu-doc.texi
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@ -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

13
ui/sdl.c
View File

@ -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;
}