test/checkkeys.c
author Patrice Mandin <patmandin@gmail.com>
Thu, 19 Jan 2006 21:28:52 +0000
changeset 1257 448a9a64537b
parent 1253 7c7ddaf195bf
child 1662 782fd950bd46
child 1895 c121d94672cb
permissions -rw-r--r--
[PATCH] SDL_GetVideoMode() does not find best mode, part 2

Following commit 1.51, I come accross a problem when SDL must choose between
several video modes that could suit the one asked.

If I ask 320x240 with this list:
768x480 768x240 640x400 640x200 384x480 384x240 320x400 320x200

The smallest selectables modes are 384x240 and 320x400. And SDL choose the later
in this list, but 384x240 is more suitable. So I added a check to compare
the pixel count (surface) of modes, and select the one which has the smallest
pixel count.

In my example, 384x240 has 92160 pixels, and 320x400 has 128000 pixels. So now
SDL will choose 384x240 for the asked 320x240 mode.
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/* Simple program:  Loop, watching keystrokes
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   Note that you need to call SDL_PollEvent() or SDL_WaitEvent() to 
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   pump the event loop and catch keystrokes.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "SDL.h"
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/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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static void quit(int rc)
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{
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	SDL_Quit();
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	exit(rc);
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}
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static void print_modifiers(void)
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{
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	int mod;
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	printf(" modifiers:");
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	mod = SDL_GetModState();
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	if(!mod) {
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		printf(" (none)");
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		return;
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	}
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	if(mod & KMOD_LSHIFT)
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		printf(" LSHIFT");
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	if(mod & KMOD_RSHIFT)
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		printf(" RSHIFT");
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	if(mod & KMOD_LCTRL)
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		printf(" LCTRL");
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	if(mod & KMOD_RCTRL)
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		printf(" RCTRL");
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	if(mod & KMOD_LALT)
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		printf(" LALT");
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	if(mod & KMOD_RALT)
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		printf(" RALT");
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	if(mod & KMOD_LMETA)
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		printf(" LMETA");
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	if(mod & KMOD_RMETA)
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		printf(" RMETA");
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	if(mod & KMOD_NUM)
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		printf(" NUM");
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	if(mod & KMOD_CAPS)
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		printf(" CAPS");
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	if(mod & KMOD_MODE)
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		printf(" MODE");
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}
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static void PrintKey(SDL_keysym *sym, int pressed)
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{
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	/* Print the keycode, name and state */
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	if ( sym->sym ) {
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		printf("Key %s:  %d-%s ", pressed ?  "pressed" : "released",
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					sym->sym, SDL_GetKeyName(sym->sym));
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	} else {
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		printf("Unknown Key (scancode = %d) %s ", sym->scancode,
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					pressed ?  "pressed" : "released");
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	}
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	/* Print the translated character, if one exists */
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	if ( sym->unicode ) {
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		/* Is it a control-character? */
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		if ( sym->unicode < ' ' ) {
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			printf(" (^%c)", sym->unicode+'@');
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		} else {
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#ifdef UNICODE
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			printf(" (%c)", sym->unicode);
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#else
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			/* This is a Latin-1 program, so only show 8-bits */
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			if ( !(sym->unicode & 0xFF00) )
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				printf(" (%c)", sym->unicode);
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			else
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				printf(" (0x%X)", sym->unicode);
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#endif
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		}
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	}
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	print_modifiers();
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	printf("\n");
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}
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int main(int argc, char *argv[])
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{
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	SDL_Event event;
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	int done;
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	Uint32 videoflags;
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	/* Initialize SDL */
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	if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
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		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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		return(1);
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	}
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	videoflags = SDL_SWSURFACE;
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	while( argc > 1 ) {
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		--argc;
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		if ( argv[argc] && !strcmp(argv[argc], "-fullscreen") ) {
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			videoflags |= SDL_FULLSCREEN;
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		} else {
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			fprintf(stderr, "Usage: %s [-fullscreen]\n", argv[0]);
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			quit(1);
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		}
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	}
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	/* Set 640x480 video mode */
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	if ( SDL_SetVideoMode(640, 480, 0, videoflags) == NULL ) {
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		fprintf(stderr, "Couldn't set 640x480 video mode: %s\n",
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							SDL_GetError());
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		quit(2);
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	}
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	/* Enable UNICODE translation for keyboard input */
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	SDL_EnableUNICODE(1);
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	/* Enable auto repeat for keyboard input */
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	SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY,
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	                    SDL_DEFAULT_REPEAT_INTERVAL);
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	/* Watch keystrokes */
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	done = 0;
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	while ( !done ) {
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		/* Check for events */
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		SDL_WaitEvent(&event);
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		switch (event.type) {
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			case SDL_KEYDOWN:
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				PrintKey(&event.key.keysym, 1);
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				break;
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			case SDL_KEYUP:
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				PrintKey(&event.key.keysym, 0);
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				break;
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			case SDL_MOUSEBUTTONDOWN:
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				/* Any button press quits the app... */
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			case SDL_QUIT:
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				done = 1;
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				break;
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			default:
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				break;
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		}
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	}
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	SDL_Quit();
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	return(0);
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}