Simple example for SDL_CreateWindowFrom

SDL Development
1

Hi All

I am looking for simple example to use SDL_CreateWindowFrom() , I have
found testnativex11.c,
Is there simple example that uses SDL_CreateWindowFrom with testnativex11.c
and can save it to BMP? Also Do I need to use OpenGL?

here is testnativex11.c code:

/*
Copyright © 1997-2011 Sam Lantinga

This software is provided ‘as-is’, without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely.
*/

#include “testnative.h”

#ifdef TEST_NATIVE_X11

static void *CreateWindowX11(int w, int h);
static void DestroyWindowX11(void *window);

NativeWindowFactory X11WindowFactory = {
“x11”,
CreateWindowX11,
DestroyWindowX11
};

static Display *dpy;

static void *
CreateWindowX11(int w, int h)
{
Window window = 0;

dpy = XOpenDisplay(NULL);
if (dpy) {
    window =
        XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 0, 0, w, h, 0,

0,
0);
XMapRaised(dpy, window);
XSync(dpy, False);
}
return (void *) window;
}

static void
DestroyWindowX11(void *window)
{
if (dpy) {
XDestroyWindow(dpy, (Window) window);
XCloseDisplay(dpy);
}
}

#endif

ThankYou

2

What exactly are you trying to do? SDL_CreateWindowFrom() is for creating
an SDL window from a native window, so you would need a program that is
already using the platform-specific windowing APIs (and then I don’t see
why you’re using SDL…). testnativex11.c is exactly what it says: a test
to make sure native x11 calls work. To create an SDL window from this,
pass the “window” variable to SDL_CreateWindowFrom().

What is it that you want to save to BMP? It almost sounds like you’re
trying to do a window/screen grab. OpenGL is not really related to all
this, as far as I can see.

Jonny DOn Thu, Jan 24, 2013 at 4:19 AM, Gadi Dor wrote:

Hi All

I am looking for simple example to use SDL_CreateWindowFrom() , I have
found testnativex11.c,
Is there simple example that uses SDL_CreateWindowFrom with
testnativex11.c and can save it to BMP? Also Do I need to use OpenGL?

here is testnativex11.c code:

/*
Copyright © 1997-2011 Sam Lantinga

This software is provided ‘as-is’, without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely.
*/

#include “testnative.h”

#ifdef TEST_NATIVE_X11

static void *CreateWindowX11(int w, int h);
static void DestroyWindowX11(void *window);

NativeWindowFactory X11WindowFactory = {
“x11”,
CreateWindowX11,
DestroyWindowX11
};

static Display *dpy;

static void *
CreateWindowX11(int w, int h)
{
Window window = 0;

dpy = XOpenDisplay(NULL);
if (dpy) {
    window =
        XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 0, 0, w, h,

0, 0,
0);
XMapRaised(dpy, window);
XSync(dpy, False);
}
return (void *) window;
}

static void
DestroyWindowX11(void *window)
{
if (dpy) {
XDestroyWindow(dpy, (Window) window);
XCloseDisplay(dpy);
}
}

#endif

ThankYou

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

3

Dear Jonny,

I am trying to make screen grab software with SDL , I want to capture
desktop and add it into SDL Surface, is it possible?

Best Regards
GadiOn Thu, Jan 24, 2013 at 4:30 PM, Jonathan Dearborn wrote:

What exactly are you trying to do? SDL_CreateWindowFrom() is for creating
an SDL window from a native window, so you would need a program that is
already using the platform-specific windowing APIs (and then I don’t see
why you’re using SDL…). testnativex11.c is exactly what it says: a test
to make sure native x11 calls work. To create an SDL window from this,
pass the “window” variable to SDL_CreateWindowFrom().

What is it that you want to save to BMP? It almost sounds like you’re
trying to do a window/screen grab. OpenGL is not really related to all
this, as far as I can see.

Jonny D

On Thu, Jan 24, 2013 at 4:19 AM, Gadi Dor <@Gadi_Dor> wrote:

Hi All

I am looking for simple example to use SDL_CreateWindowFrom() , I have
found testnativex11.c,
Is there simple example that uses SDL_CreateWindowFrom with
testnativex11.c and can save it to BMP? Also Do I need to use OpenGL?

here is testnativex11.c code:

/*
Copyright © 1997-2011 Sam Lantinga

This software is provided ‘as-is’, without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely.
*/

#include “testnative.h”

#ifdef TEST_NATIVE_X11

static void *CreateWindowX11(int w, int h);
static void DestroyWindowX11(void *window);

NativeWindowFactory X11WindowFactory = {
“x11”,
CreateWindowX11,
DestroyWindowX11
};

static Display *dpy;

static void *
CreateWindowX11(int w, int h)
{
Window window = 0;

dpy = XOpenDisplay(NULL);
if (dpy) {
    window =
        XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 0, 0, w, h,

0, 0,
0);
XMapRaised(dpy, window);
XSync(dpy, False);
}
return (void *) window;
}

static void
DestroyWindowX11(void *window)
{
if (dpy) {
XDestroyWindow(dpy, (Window) window);
XCloseDisplay(dpy);
}
}

#endif

ThankYou

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SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

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4

I’m sure it’s possible with SDL, but it will require some platform-specific
code to get any sort of desktop surface/window handle. I can’t personally
help any further to get you there, though. You’ll have to look through
some X-Windows or windows manager documentation or some open-source code.
Once you get the window handle and get the SDL_Window from it, you might
be able to use SDL_GetWindowSurface() and save that to a file.

Jonny DOn Sat, Jan 26, 2013 at 3:22 AM, Gadi Dor wrote:

Dear Jonny,

I am trying to make screen grab software with SDL , I want to capture
desktop and add it into SDL Surface, is it possible?

Best Regards
Gadi

On Thu, Jan 24, 2013 at 4:30 PM, Jonathan Dearborn <@Jonathan_Dearborn>wrote:

What exactly are you trying to do? SDL_CreateWindowFrom() is for
creating an SDL window from a native window, so you would need a program
that is already using the platform-specific windowing APIs (and then I
don’t see why you’re using SDL…). testnativex11.c is exactly what it
says: a test to make sure native x11 calls work. To create an SDL window
from this, pass the “window” variable to SDL_CreateWindowFrom().

What is it that you want to save to BMP? It almost sounds like you’re
trying to do a window/screen grab. OpenGL is not really related to all
this, as far as I can see.

Jonny D

On Thu, Jan 24, 2013 at 4:19 AM, Gadi Dor wrote:

Hi All

I am looking for simple example to use SDL_CreateWindowFrom() , I have
found testnativex11.c,
Is there simple example that uses SDL_CreateWindowFrom with
testnativex11.c and can save it to BMP? Also Do I need to use OpenGL?

here is testnativex11.c code:

/*
Copyright © 1997-2011 Sam Lantinga

This software is provided ‘as-is’, without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely.
*/

#include “testnative.h”

#ifdef TEST_NATIVE_X11

static void *CreateWindowX11(int w, int h);
static void DestroyWindowX11(void *window);

NativeWindowFactory X11WindowFactory = {
“x11”,
CreateWindowX11,
DestroyWindowX11
};

static Display *dpy;

static void *
CreateWindowX11(int w, int h)
{
Window window = 0;

dpy = XOpenDisplay(NULL);
if (dpy) {
    window =
        XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 0, 0, w, h,

0, 0,
0);
XMapRaised(dpy, window);
XSync(dpy, False);
}
return (void *) window;
}

static void
DestroyWindowX11(void *window)
{
if (dpy) {
XDestroyWindow(dpy, (Window) window);
XCloseDisplay(dpy);
}
}

#endif

ThankYou

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

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5

No, that’s not what SDL_CreateWindowFrom does.

SDL_CreateWindowFrom allows you to take a native window and turn it into a SDL rendering context that you can render SDL_Surfaces to.? It does not turn the existing window into an SDL_Surface.? I use it to embed a rendering area into a normal GUI app, for example.

If you’re looking to make screen grab software, this isn’t the way to do it.? Try looking at the OS’s APIs. I’m sure there’s something that already exists for that purpose.________________________________
From: Gadi Dor
To: SDL Development List
Sent: Saturday, January 26, 2013 12:22 AM
Subject: Re: [SDL] simple example for SDL_CreateWindowFrom

Dear Jonny,

I am trying to make screen grab software with SDL , I want to capture desktop and add it into SDL Surface, is it possible?

Best Regards
Gadi

On Thu, Jan 24, 2013 at 4:30 PM, Jonathan Dearborn wrote:

What exactly are you trying to do? ?SDL_CreateWindowFrom() is for creating an SDL window from a native window, so you would need a program that is already using the platform-specific windowing APIs (and then I don’t see why you’re using SDL…). ?testnativex11.c is exactly what it says: a test to make sure native x11 calls work. ?To create an SDL window from this, pass the “window” variable to SDL_CreateWindowFrom().

What is it that you want to save to BMP? ?It almost sounds like you’re trying to do a window/screen grab. ?OpenGL is not really related to all this, as far as I can see.

Jonny D

On Thu, Jan 24, 2013 at 4:19 AM, Gadi Dor wrote:

Hi All

I am looking for simple example to use SDL_CreateWindowFrom() , I have found? testnativex11.c,
Is
there simple example that uses SDL_CreateWindowFrom with
testnativex11.c and can save it to BMP? Also Do I need to use OpenGL?

here is testnativex11.c code:

/*
? Copyright © 1997-2011 Sam Lantinga

? This software is provided ‘as-is’, without any express or implied
? warranty.? In no event will the authors be held liable for any damages
? arising from the use of this software.

? Permission is granted to anyone to use this software for any purpose,
? including commercial applications, and to alter it and redistribute it
? freely.
*/

#include “testnative.h”

#ifdef TEST_NATIVE_X11

static void *CreateWindowX11(int w, int h);
static void DestroyWindowX11(void *window);

NativeWindowFactory X11WindowFactory = {
??? “x11”,
??? CreateWindowX11,
??? DestroyWindowX11
};

static Display *dpy;

static void *
CreateWindowX11(int w, int h)
{
??? Window window = 0;

??? dpy = XOpenDisplay(NULL);
??? if (dpy) {
??? window =
??? XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 0, 0, w, h, 0, 0,
??? 0);
??? XMapRaised(dpy, window);
??? XSync(dpy, False);
??? }
??? return (void *) window;
}

static void
DestroyWindowX11(void *window)
{
??? if (dpy) {
??? XDestroyWindow(dpy, (Window) window);
??? XCloseDisplay(dpy);
??? }
}

#endif

ThankYou

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

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SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

6

Hi All,

Thank you again,

Well I *want to use *DefaultRootWindow in linux and GetDesktop or bitbit
in windows , can I add it into SDL_Surface?

I don’t know if I can use SDL (what I would prefer) or better to use QT or
Gdk?

Best Regards
GadiOn Sat, Jan 26, 2013 at 5:59 PM, Mason Wheeler wrote:

No, that’s not what SDL_CreateWindowFrom does.

SDL_CreateWindowFrom allows you to take a native window and turn it into a
SDL rendering context that you can render SDL_Surfaces to. It does not
turn the existing window into an SDL_Surface. I use it to embed a
rendering area into a normal GUI app, for example.

If you’re looking to make screen grab software, this isn’t the way to do
it. Try looking at the OS’s APIs. I’m sure there’s something that already
exists for that purpose.

From: Gadi Dor <@Gadi_Dor>
To: SDL Development List
Sent: Saturday, January 26, 2013 12:22 AM
Subject: Re: [SDL] simple example for SDL_CreateWindowFrom

Dear Jonny,

I am trying to make screen grab software with SDL , I want to capture
desktop and add it into SDL Surface, is it possible?

Best Regards
Gadi

On Thu, Jan 24, 2013 at 4:30 PM, Jonathan Dearborn wrote:

What exactly are you trying to do? SDL_CreateWindowFrom() is for creating
an SDL window from a native window, so you would need a program that is
already using the platform-specific windowing APIs (and then I don’t see
why you’re using SDL…). testnativex11.c is exactly what it says: a test
to make sure native x11 calls work. To create an SDL window from this,
pass the “window” variable to SDL_CreateWindowFrom().

What is it that you want to save to BMP? It almost sounds like you’re
trying to do a window/screen grab. OpenGL is not really related to all
this, as far as I can see.

Jonny D

On Thu, Jan 24, 2013 at 4:19 AM, Gadi Dor <@Gadi_Dor> wrote:

Hi All

I am looking for simple example to use SDL_CreateWindowFrom() , I have
found testnativex11.c,
Is there simple example that uses SDL_CreateWindowFrom with
testnativex11.c and can save it to BMP? Also Do I need to use OpenGL?

here is testnativex11.c code:

/*
Copyright © 1997-2011 Sam Lantinga

This software is provided ‘as-is’, without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely.
*/

#include “testnative.h”

#ifdef TEST_NATIVE_X11

static void *CreateWindowX11(int w, int h);
static void DestroyWindowX11(void *window);

NativeWindowFactory X11WindowFactory = {
“x11”,
CreateWindowX11,
DestroyWindowX11
};

static Display *dpy;

static void *
CreateWindowX11(int w, int h)
{
Window window = 0;

dpy = XOpenDisplay(NULL);
if (dpy) {
    window =
        XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 0, 0, w, h,

0, 0,
0);
XMapRaised(dpy, window);
XSync(dpy, False);
}
return (void *) window;
}

static void
DestroyWindowX11(void *window)
{
if (dpy) {
XDestroyWindow(dpy, (Window) window);
XCloseDisplay(dpy);
}
}

#endif

ThankYou

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

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