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POReplacing SDL with GTK+ for mouse and keyboard and displaying a frame buffer
 

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  1. POReplacing SDL with GTK+ for mouse and keyboard and displaying a frame buffer
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    <p>I started building my program with SDL. I am using SDL to render a frame buffer live on the screen and also looking for user input from the keyboard and the mouse.</p> <p>I have been using the following code to display a 5-6-5 RGB frame buffer on the screen.</p> <pre><code>SDL_Surface* screen = SDL_SetVideoMode(width, height, bitsPerPixel, SDL_SWSURFACE); SDL_Surface* surface = SDL_CreateRGBSurfaceFrom(frameBuffer, width, height, depth, lineWidth, Rmask, Gmask, Bmask, Amask); SDL_BlitSurface(surface, NULL, screen, NULL); SDL_Flip(screen); </code></pre> <p>Note that Rmask, Gmask and Bmask and Amask are all 0. I am using SDL's default masking.</p> <p>For the keyboard and mouse, I have been using the following code:</p> <pre><code>while (run) { SDL_WaitEvent(&amp;event); switch (event.type) { // Key is pressed case SDL_KEYDOWN: map&lt;int, int&gt;::iterator it = SDLToAndroid.find(event.key.keysym.sym); if (it != SDLToAndroid.end()) { /* ... */ } break; case SDL_MOUSEBUTTONDOWN: // Left click if (event.button.button == SDL_BUTTON_LEFT) { /* ... */ } break; </code></pre> <p>Where for keypresses I look them up in map to convert them to some other keys.</p> <p>This works great, but I would like to use the capabilities of GTK (in terms of UI). I started including SDL into my GTK+ window using putenv environment (<a href="http://sdl.beuc.net/sdl.wiki/FAQ_GUI" rel="nofollow">The SDL_WINDOWID hack</a>) but I have two problems:</p> <p>a) SDL events are not received with this solution. b) The frame buffer display is always put on the top left of the window (0,0) but I would actually like this display to show up somewhere in the middle on my window, with some buttons above and below.</p> <p>I am thinking of getting rid of SDL and just use GTK+ itself. There are a few things that I would please like to ask you, as I am very new with GTK+.</p> <p>Could you please tell me what kind of GtkWidget should be used to display my frame buffer inside a window? Does anyone also please know what function I could use in GTK to perform the same task as SDL_CreateRGBSurfaceFrom() (if it is even possible)? And finally, would you please link me to a way to get the x and y coordinates in the GtkWidget that gets clicked or moved in, and not the coordinates of the whole window, as well as keyboards input?</p> <p>(I have found some solution for the mouse and keyboard. I've seen the "configure-event" used to get the x and y values, but I am not sure if this event works on any GtkWidget. Also for keyboard, what I have found is to use "activate", but I'd like to be confirmed this is the right approach.)</p>
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    1. CO`GtkPixmap` is the widget I'd use; in many cases, it's backed by a `GdkPixmap` which you'd write to as an offscreen buffer and display in the widget. As for the mouse control, perhaps the Scribble tutorial can provide some insight: http://www.gtk.org/tutorial1.2/gtk_tut-23.html
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    2. COThanks a lot. this should be very helpful!
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    3. COSide note: `GTK 3 will remove GdkPixmap and GdkBitmap. You should use cairo surfaces instead. However, because a lot of functions still use these types, they are not deprecated.` - from [the developer page](http://developer.gnome.org/gdk/stable/gdk-Bitmaps-and-Pixmaps.html#gdk-Bitmaps-and-Pixmaps.description)
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