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PlayswithSquirrels

Allegro bitmap problems

5 posts in this topic

New at programming. Trying to create a 16-puzzle on allegro. I'm still at the stage of trying to make an image show up on the screen, but when I compile, the screen goes black and no image is shown. No error messages or warnings pop up.

 

#include <allegro.h>

void init();
void deinit();

int main() {
	init();
	
	BITMAP *my_pic;
	PALETTE palette;
	my_pic = load_bitmap("chihuahua.bmp", palette);
	
	if(my_pic==NULL)
	{
		set_gfx_mode(GFX_TEXT, 0,0,0,0);
		allegro_message("Can't load chihuahua.bmp");
		return 1;
	}

	while (!key[KEY_ESC]) {
		blit(my_pic, screen, 0,0,0,0,50,50);
		blit(my_pic, screen, 50,50,100,100,150,150);
		clear(my_pic);
	}
	
	destroy_bitmap(my_pic);
	deinit();
	return 0;
}
END_OF_MAIN()

void init() {
	int depth, res;
	allegro_init();
	depth = desktop_color_depth();
	if (depth == 0) depth = 32;
	set_color_depth(depth);
	res = set_gfx_mode(GFX_AUTODETECT_WINDOWED, 640, 480, 0, 0);
	if (res != 0) {
		allegro_message(allegro_error);
		exit(-1);
	}

	install_timer();
	install_keyboard();
	install_mouse();
}

void deinit() {
	clear_keybuf();
}

 

I'm really frustrated, I've been at this for 3 days, to no avail. I'm on a time crunch, I still have alot to do with the code, and can't do any of it if the bitmap refuses to open. Any and all help is welcome.

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I have a question: what exactly does clear(my_pic); do? If it clears the loaded image you probably want clear(screen); or whatever clears the screen instead.

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Thanks for the tip, the image now shows up. But now it keeps flickering. When I take out clear(screen) the image still shows up and doesn't flicker. Do you think the clear(screen) would make too much of a difference if I just don't use it?

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If you redraw the entire screen (or at least all parts of the screen that change) every frame then removing clear(screen) won't make any difference otherwise part of the old frame will still be on the screen.

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