FVWM full screen SDL

thomasadam · 25 January 2021 20:16

Ah – I do remember this, and apologies this fell through the cracks. I’ve just taken a look…

Thanks to your instructions, I installed SDL2 and compiled the example program:

// Modification History
// Created on 04/09/20 by Dan Espen:
// - Demo fullscreen with SDL2
// - Full screen 640x480 window,
//   terminate with escape,
//   times out after a few secs.
#include <SDL2/SDL.h>

int main(int argc, char *argv[]) {
	SDL_Window* window = NULL;
	SDL_Renderer* renderer;
	if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_EVENTS) != 0) {
		SDL_Log("Failed to initialize SDL: %s", SDL_GetError());
		return 1;
	}
	// fixme, the WM is adding titlebar and borders,
	// To remove decoration, Run:
	// FvwmCommand 'Style "mywind" NoTitle, BorderWidth 0, HandleWidth 0'
	window = SDL_CreateWindow("mywind",
			SDL_WINDOWPOS_UNDEFINED,
			SDL_WINDOWPOS_UNDEFINED,
			640, 480,
			SDL_WINDOW_FULLSCREEN_DESKTOP
			|SDL_WINDOW_BORDERLESS);
	renderer = SDL_CreateRenderer(window, -1, 0);
	SDL_SetRenderDrawColor(renderer,
			0x80, 0x80, 0xFF, 0xFF); // RGBA
	SDL_RenderClear(renderer);
	SDL_RenderPresent(renderer);

	bool quitting = false;
	int how_long = 0;
	while(!quitting) {
		SDL_Event event;
		while( SDL_PollEvent(&event) ) {
			switch (event.type) {
				case SDL_QUIT:
					quitting = true;
					break;
				case SDL_KEYDOWN:
					switch (event.key.keysym.scancode) { 
						case SDL_SCANCODE_Q:
						case SDL_SCANCODE_ESCAPE:
							quitting = true;
							printf("quit on key\n");
							break;
					}
			}
		}
		SDL_Delay(300);
		if (how_long++ > 500) {
			quitting = true;
			printf("quit on count\n");
		}
	}
	SDL_DestroyWindow(window);
	SDL_Quit();
	exit(0);
}

But, when I run it, I get a fullscreened window (a nice blue colour, I must say!) without a border.

When I look at xprop(1) on this window, I see this:

_MOTIF_WM_HINTS(_MOTIF_WM_HINTS) = 0x2, 0x0, 0x0, 0x0, 0x0

I assume therefore this is what will fix things for you:

Style mywind MwmDecor

I have MwmDecor set globally, which is why things worked fine for me to begin with.

Kindly,
Thomas