[Qemu-devel] [PATCH] Embed QEmu screen on a custom window

[Miguel Angel Fraile <mianfrar@gmail.com>]

Hi,

I'm the author of QGui, a windows frontend for QEmu available at
http://perso.wanadoo.es/comike.

I've been trying to attach the QEmu screen to my frontend, but I
finally realized I needed to modify QEmu source to get it.

So I've attached a patch that adds a "-hwnd <handle>" argument to QEmu.

<handle> refers to the window handle where QEmu should be embedded (it
can be any control like a groupbox, form, etc).

Then, QEmu creates a new window that has the window specified at
command-line as parent. If QEmu screen size changes, parent and child
windows are resized automatically.

I hope the patch can be applied to CVS, as it would be very useful for
frontend authors.

PS: Please, add my mail address on CC, as I'm not subscribed to this list.

------------------------------------
--- vl.c Thu May 26 11:04:04 2005
+++ vl.c.new Thu May 26 11:03:34 2005
@@ -150,6 +150,9 @@
#ifdef TARGET_I386
int win2k_install_hack = 0;
#endif
+#ifdef _WIN32
+HWND fend_hwnd, qemu_hwnd;
+#endif

/***********************************************************/
/* x86 ISA bus support */
@@ -2785,6 +2788,9 @@
            "-serial dev     redirect the serial port to char device 'dev'\n"
            "-parallel dev   redirect the parallel port to char device 'dev'\n"
            "-pidfile file   Write PID to 'file'\n"
+#ifdef _WIN32
+           "-hwnd handle embed QEmu inside a custom window"
+#endif
            "-S              freeze CPU at startup (use 'c' to start
execution)\n"
            "-s              wait gdb connection to port %d\n"
            "-p port         change gdb connection port\n"
@@ -2883,6 +2889,7 @@
     QEMU_OPTION_loadvm,
     QEMU_OPTION_full_screen,
     QEMU_OPTION_pidfile,
+ QEMU_OPTION_hwnd,
     QEMU_OPTION_no_kqemu,
     QEMU_OPTION_win2k_hack,
};
@@ -2953,6 +2960,9 @@
     { "loadvm", HAS_ARG, QEMU_OPTION_loadvm },
     { "full-screen", 0, QEMU_OPTION_full_screen },
     { "pidfile", HAS_ARG, QEMU_OPTION_pidfile },
+#ifdef _WIN32
+ { "hwnd", HAS_ARG, QEMU_OPTION_hwnd },
+#endif
     { "win2k-hack", 0, QEMU_OPTION_win2k_hack },
     
     /* temporary options */
@@ -3036,7 +3046,13 @@
     char parallel_devices[MAX_PARALLEL_PORTS][128];
     int parallel_device_index;
     const char *loadvm = NULL;
-    
+
+#ifdef _WIN32
+ char widbuf[24];
+ fend_hwnd=NULL;
+ qemu_hwnd=NULL;
+#endif
+
#if !defined(CONFIG_SOFTMMU)
     /* we never want that malloc() uses mmap() */
     mallopt(M_MMAP_THRESHOLD, 4096 * 1024);
@@ -3405,6 +3421,16 @@
             case QEMU_OPTION_pidfile:
                 create_pidfile(optarg);
                 break;
+#ifdef _WIN32
+ case QEMU_OPTION_hwnd:
+ fend_hwnd=(HWND)atoi(optarg);
+ qemu_hwnd=CreateWindow("BUTTON",NULL,BS_OWNERDRAW | WS_CHILD |
+ WS_VISIBLE,0,0,700,420,fend_hwnd,NULL,
+ GetModuleHandle(NULL),NULL);
+ sprintf(widbuf,"SDL_WINDOWID=%#x",(long)qemu_hwnd);
+ putenv(widbuf);
+ break;
+#endif
#ifdef TARGET_I386
             case QEMU_OPTION_win2k_hack:
                 win2k_install_hack = 1;
--- sdl.c Thu May 26 11:03:50 2005
+++ sdl.c.new Thu May 26 11:03:44 2005
@@ -27,6 +27,9 @@

#ifndef _WIN32
#include <signal.h>
+#else
+#include <windows.h>
+extern HWND fend_hwnd,qemu_hwnd;
#endif

static SDL_Surface *screen;
@@ -66,6 +69,12 @@
     ds->depth = screen->format->BitsPerPixel;
     ds->width = w;
     ds->height = h;
+#ifdef _WIN32
+ SetWindowPos(qemu_hwnd,NULL,0,0,w,h,SWP_NOMOVE |
+ SWP_NOREPOSITION | SWP_NOZORDER);
+ SetWindowPos(fend_hwnd,NULL,0,0,w,h,SWP_NOMOVE |
+ SWP_NOREPOSITION | SWP_NOZORDER);
+#endif
}

/* generic keyboard conversion */
@@ -258,6 +267,9 @@
     if (gui_grab) {
         strcat(buf, " - Press Ctrl-Alt to exit grab");
     }
+#ifdef _WIN32
+ if (qemu_hwnd!=NULL)
+#endif
     SDL_WM_SetCaption(buf, "QEMU");
} 
-----------------------------------

Best regards.
Míguel