test/testalpha.c
changeset 1895 c121d94672cb
parent 1779 67fc81efcfc3
child 2267 c785543d1843
--- a/test/testalpha.c	Thu Jul 06 18:01:37 2006 +0000
+++ b/test/testalpha.c	Mon Jul 10 21:04:37 2006 +0000
@@ -10,523 +10,527 @@
 
 #include "SDL.h"
 
-#define FRAME_TICKS	(1000/30)		/* 30 frames/second */
+#define FRAME_TICKS	(1000/30)       /* 30 frames/second */
 
 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
-static void quit(int rc)
+static void
+quit(int rc)
 {
-	SDL_Quit();
-	exit(rc);
+    SDL_Quit();
+    exit(rc);
 }
 
 /* Fill the screen with a gradient */
-static void FillBackground(SDL_Surface *screen)
+static void
+FillBackground(SDL_Surface * screen)
 {
-	Uint8 *buffer;
-	Uint16 *buffer16;
-        Uint16 color;
-        Uint8  gradient;
-	int    i, k;
+    Uint8 *buffer;
+    Uint16 *buffer16;
+    Uint16 color;
+    Uint8 gradient;
+    int i, k;
 
-	/* Set the surface pixels and refresh! */
-	if ( SDL_LockSurface(screen) < 0 ) {
-		fprintf(stderr, "Couldn't lock the display surface: %s\n",
-							SDL_GetError());
-		quit(2);
-	}
-	buffer=(Uint8 *)screen->pixels;
-	if (screen->format->BytesPerPixel!=2) {
-		for ( i=0; i<screen->h; ++i ) {
-			memset(buffer,(i*255)/screen->h, screen->w*screen->format->BytesPerPixel);
-			buffer += screen->pitch;
-		}
-	}
-        else
-        {
-		for ( i=0; i<screen->h; ++i ) {
-			gradient=((i*255)/screen->h);
-                        color = (Uint16)SDL_MapRGB(screen->format, gradient, gradient, gradient);
-                        buffer16=(Uint16*)buffer;
-                        for (k=0; k<screen->w; k++)
-                        {
-                            *(buffer16+k)=color;
-                        }
-			buffer += screen->pitch;
-		}
+    /* Set the surface pixels and refresh! */
+    if (SDL_LockSurface(screen) < 0) {
+        fprintf(stderr, "Couldn't lock the display surface: %s\n",
+                SDL_GetError());
+        quit(2);
+    }
+    buffer = (Uint8 *) screen->pixels;
+    if (screen->format->BytesPerPixel != 2) {
+        for (i = 0; i < screen->h; ++i) {
+            memset(buffer, (i * 255) / screen->h,
+                   screen->w * screen->format->BytesPerPixel);
+            buffer += screen->pitch;
         }
+    } else {
+        for (i = 0; i < screen->h; ++i) {
+            gradient = ((i * 255) / screen->h);
+            color =
+                (Uint16) SDL_MapRGB(screen->format, gradient, gradient,
+                                    gradient);
+            buffer16 = (Uint16 *) buffer;
+            for (k = 0; k < screen->w; k++) {
+                *(buffer16 + k) = color;
+            }
+            buffer += screen->pitch;
+        }
+    }
 
-	SDL_UnlockSurface(screen);
-	SDL_UpdateRect(screen, 0, 0, 0, 0);
+    SDL_UnlockSurface(screen);
+    SDL_UpdateRect(screen, 0, 0, 0, 0);
 }
 
 /* Create a "light" -- a yellowish surface with variable alpha */
-SDL_Surface *CreateLight(int radius)
+SDL_Surface *
+CreateLight(int radius)
 {
-	Uint8  trans, alphamask;
-	int    range, addition;
-	int    xdist, ydist;
-	Uint16 x, y;
-	Uint16 skip;
-	Uint32 pixel;
-	SDL_Surface *light;
+    Uint8 trans, alphamask;
+    int range, addition;
+    int xdist, ydist;
+    Uint16 x, y;
+    Uint16 skip;
+    Uint32 pixel;
+    SDL_Surface *light;
 
 #ifdef LIGHT_16BIT
-	Uint16 *buf;
+    Uint16 *buf;
 
-	/* Create a 16 (4/4/4/4) bpp square with a full 4-bit alpha channel */
-	/* Note: this isn't any faster than a 32 bit alpha surface */
-	alphamask = 0x0000000F;
-	light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2*radius, 2*radius, 16,
-			0x0000F000, 0x00000F00, 0x000000F0, alphamask);
+    /* Create a 16 (4/4/4/4) bpp square with a full 4-bit alpha channel */
+    /* Note: this isn't any faster than a 32 bit alpha surface */
+    alphamask = 0x0000000F;
+    light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2 * radius, 2 * radius, 16,
+                                 0x0000F000, 0x00000F00, 0x000000F0,
+                                 alphamask);
 #else
-	Uint32 *buf;
+    Uint32 *buf;
 
-	/* Create a 32 (8/8/8/8) bpp square with a full 8-bit alpha channel */
-	alphamask = 0x000000FF;
-	light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2*radius, 2*radius, 32,
-			0xFF000000, 0x00FF0000, 0x0000FF00, alphamask);
-	if ( light == NULL ) {
-		fprintf(stderr, "Couldn't create light: %s\n", SDL_GetError());
-		return(NULL);
-	}
+    /* Create a 32 (8/8/8/8) bpp square with a full 8-bit alpha channel */
+    alphamask = 0x000000FF;
+    light = SDL_CreateRGBSurface(SDL_SWSURFACE, 2 * radius, 2 * radius, 32,
+                                 0xFF000000, 0x00FF0000, 0x0000FF00,
+                                 alphamask);
+    if (light == NULL) {
+        fprintf(stderr, "Couldn't create light: %s\n", SDL_GetError());
+        return (NULL);
+    }
 #endif
 
-	/* Fill with a light yellow-orange color */
-	skip = light->pitch-(light->w*light->format->BytesPerPixel);
+    /* Fill with a light yellow-orange color */
+    skip = light->pitch - (light->w * light->format->BytesPerPixel);
 #ifdef LIGHT_16BIT
-	buf = (Uint16 *)light->pixels;
+    buf = (Uint16 *) light->pixels;
 #else
-	buf = (Uint32 *)light->pixels;
+    buf = (Uint32 *) light->pixels;
 #endif
-        /* Get a tranparent pixel value - we'll add alpha later */
-	pixel = SDL_MapRGBA(light->format, 0xFF, 0xDD, 0x88, 0);
-	for ( y=0; y<light->h; ++y ) {
-		for ( x=0; x<light->w; ++x ) {
-			*buf++ = pixel;
-		}
-		buf += skip;	/* Almost always 0, but just in case... */
-	}
+    /* Get a tranparent pixel value - we'll add alpha later */
+    pixel = SDL_MapRGBA(light->format, 0xFF, 0xDD, 0x88, 0);
+    for (y = 0; y < light->h; ++y) {
+        for (x = 0; x < light->w; ++x) {
+            *buf++ = pixel;
+        }
+        buf += skip;            /* Almost always 0, but just in case... */
+    }
 
-	/* Calculate alpha values for the surface. */
+    /* Calculate alpha values for the surface. */
 #ifdef LIGHT_16BIT
-	buf = (Uint16 *)light->pixels;
+    buf = (Uint16 *) light->pixels;
 #else
-	buf = (Uint32 *)light->pixels;
+    buf = (Uint32 *) light->pixels;
 #endif
-	for ( y=0; y<light->h; ++y ) {
-		for ( x=0; x<light->w; ++x ) {
-			/* Slow distance formula (from center of light) */
-			xdist = x-(light->w/2);
-			ydist = y-(light->h/2);
-			range = (int)sqrt(xdist*xdist+ydist*ydist);
+    for (y = 0; y < light->h; ++y) {
+        for (x = 0; x < light->w; ++x) {
+            /* Slow distance formula (from center of light) */
+            xdist = x - (light->w / 2);
+            ydist = y - (light->h / 2);
+            range = (int) sqrt(xdist * xdist + ydist * ydist);
 
-			/* Scale distance to range of transparency (0-255) */
-			if ( range > radius ) {
-				trans = alphamask;
-			} else {
-				/* Increasing transparency with distance */
-				trans = (Uint8)((range*alphamask)/radius);
+            /* Scale distance to range of transparency (0-255) */
+            if (range > radius) {
+                trans = alphamask;
+            } else {
+                /* Increasing transparency with distance */
+                trans = (Uint8) ((range * alphamask) / radius);
 
-				/* Lights are very transparent */
-				addition = (alphamask+1)/8;
-				if ( (int)trans+addition > alphamask ) {
-					trans = alphamask;
-				} else {
-					trans += addition;
-				}
-			}
-			/* We set the alpha component as the right N bits */
-			*buf++ |= (255-trans);
-		}
-		buf += skip;	/* Almost always 0, but just in case... */
-	}
-	/* Enable RLE acceleration of this alpha surface */
-	SDL_SetAlpha(light, SDL_SRCALPHA|SDL_RLEACCEL, 0);
+                /* Lights are very transparent */
+                addition = (alphamask + 1) / 8;
+                if ((int) trans + addition > alphamask) {
+                    trans = alphamask;
+                } else {
+                    trans += addition;
+                }
+            }
+            /* We set the alpha component as the right N bits */
+            *buf++ |= (255 - trans);
+        }
+        buf += skip;            /* Almost always 0, but just in case... */
+    }
+    /* Enable RLE acceleration of this alpha surface */
+    SDL_SetAlpha(light, SDL_SRCALPHA | SDL_RLEACCEL, 0);
 
-	/* We're done! */
-	return(light);
+    /* We're done! */
+    return (light);
 }
 
 static Uint32 flashes = 0;
 static Uint32 flashtime = 0;
 
-void FlashLight(SDL_Surface *screen, SDL_Surface *light, int x, int y)
+void
+FlashLight(SDL_Surface * screen, SDL_Surface * light, int x, int y)
 {
-	SDL_Rect position;
-	Uint32   ticks1;
-	Uint32   ticks2;
+    SDL_Rect position;
+    Uint32 ticks1;
+    Uint32 ticks2;
 
-	/* Easy, center light */
-	position.x = x-(light->w/2);
-	position.y = y-(light->h/2);
-	position.w = light->w;
-	position.h = light->h;
-	ticks1 = SDL_GetTicks();
-	SDL_BlitSurface(light, NULL, screen, &position);
-	ticks2 = SDL_GetTicks();
-	SDL_UpdateRects(screen, 1, &position);
-	++flashes;
+    /* Easy, center light */
+    position.x = x - (light->w / 2);
+    position.y = y - (light->h / 2);
+    position.w = light->w;
+    position.h = light->h;
+    ticks1 = SDL_GetTicks();
+    SDL_BlitSurface(light, NULL, screen, &position);
+    ticks2 = SDL_GetTicks();
+    SDL_UpdateRects(screen, 1, &position);
+    ++flashes;
 
-	/* Update time spend doing alpha blitting */
-	flashtime += (ticks2-ticks1);
+    /* Update time spend doing alpha blitting */
+    flashtime += (ticks2 - ticks1);
 }
 
 static int sprite_visible = 0;
 static SDL_Surface *sprite;
 static SDL_Surface *backing;
-static SDL_Rect    position;
-static int         x_vel, y_vel;
-static int	   alpha_vel;
+static SDL_Rect position;
+static int x_vel, y_vel;
+static int alpha_vel;
 
-int LoadSprite(SDL_Surface *screen, char *file)
+int
+LoadSprite(SDL_Surface * screen, char *file)
 {
-	SDL_Surface *converted;
-
-	/* Load the sprite image */
-	sprite = SDL_LoadBMP(file);
-	if ( sprite == NULL ) {
-		fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError());
-		return(-1);
-	}
+    SDL_Surface *converted;
 
-	/* Set transparent pixel as the pixel at (0,0) */
-	if ( sprite->format->palette ) {
-		SDL_SetColorKey(sprite, SDL_SRCCOLORKEY,
-						*(Uint8 *)sprite->pixels);
-	}
+    /* Load the sprite image */
+    sprite = SDL_LoadBMP(file);
+    if (sprite == NULL) {
+        fprintf(stderr, "Couldn't load %s: %s", file, SDL_GetError());
+        return (-1);
+    }
 
-	/* Convert sprite to video format */
-	converted = SDL_DisplayFormat(sprite);
-	SDL_FreeSurface(sprite);
-	if ( converted == NULL ) {
-		fprintf(stderr, "Couldn't convert background: %s\n",
-							SDL_GetError());
-		return(-1);
-	}
-	sprite = converted;
+    /* Set transparent pixel as the pixel at (0,0) */
+    if (sprite->format->palette) {
+        SDL_SetColorKey(sprite, SDL_SRCCOLORKEY, *(Uint8 *) sprite->pixels);
+    }
+
+    /* Convert sprite to video format */
+    converted = SDL_DisplayFormat(sprite);
+    SDL_FreeSurface(sprite);
+    if (converted == NULL) {
+        fprintf(stderr, "Couldn't convert background: %s\n", SDL_GetError());
+        return (-1);
+    }
+    sprite = converted;
 
-	/* Create the background */
-	backing = SDL_CreateRGBSurface(SDL_SWSURFACE, sprite->w, sprite->h, 8,
-								0, 0, 0, 0);
-	if ( backing == NULL ) {
-		fprintf(stderr, "Couldn't create background: %s\n",
-							SDL_GetError());
-		SDL_FreeSurface(sprite);
-		return(-1);
-	}
+    /* Create the background */
+    backing = SDL_CreateRGBSurface(SDL_SWSURFACE, sprite->w, sprite->h, 8,
+                                   0, 0, 0, 0);
+    if (backing == NULL) {
+        fprintf(stderr, "Couldn't create background: %s\n", SDL_GetError());
+        SDL_FreeSurface(sprite);
+        return (-1);
+    }
 
-	/* Convert background to video format */
-	converted = SDL_DisplayFormat(backing);
-	SDL_FreeSurface(backing);
-	if ( converted == NULL ) {
-		fprintf(stderr, "Couldn't convert background: %s\n",
-							SDL_GetError());
-		SDL_FreeSurface(sprite);
-		return(-1);
-	}
-	backing = converted;
+    /* Convert background to video format */
+    converted = SDL_DisplayFormat(backing);
+    SDL_FreeSurface(backing);
+    if (converted == NULL) {
+        fprintf(stderr, "Couldn't convert background: %s\n", SDL_GetError());
+        SDL_FreeSurface(sprite);
+        return (-1);
+    }
+    backing = converted;
 
-	/* Set the initial position of the sprite */
-	position.x = (screen->w-sprite->w)/2;
-	position.y = (screen->h-sprite->h)/2;
-	position.w = sprite->w;
-	position.h = sprite->h;
-	x_vel = 0; y_vel = 0;
-	alpha_vel = 1;
+    /* Set the initial position of the sprite */
+    position.x = (screen->w - sprite->w) / 2;
+    position.y = (screen->h - sprite->h) / 2;
+    position.w = sprite->w;
+    position.h = sprite->h;
+    x_vel = 0;
+    y_vel = 0;
+    alpha_vel = 1;
 
-	/* We're ready to roll. :) */
-	return(0);
+    /* We're ready to roll. :) */
+    return (0);
 }
 
-void AttractSprite(Uint16 x, Uint16 y)
+void
+AttractSprite(Uint16 x, Uint16 y)
 {
-	x_vel = ((int)x-position.x)/10;
-	y_vel = ((int)y-position.y)/10;
+    x_vel = ((int) x - position.x) / 10;
+    y_vel = ((int) y - position.y) / 10;
 }
 
-void MoveSprite(SDL_Surface *screen, SDL_Surface *light)
+void
+MoveSprite(SDL_Surface * screen, SDL_Surface * light)
 {
-	SDL_Rect updates[2];
-	int alpha;
+    SDL_Rect updates[2];
+    int alpha;
 
-	/* Erase the sprite if it was visible */
-	if ( sprite_visible ) {
-		updates[0] = position;
-		SDL_BlitSurface(backing, NULL, screen, &updates[0]);
-	} else {
-		updates[0].x = 0; updates[0].y = 0;
-		updates[0].w = 0; updates[0].h = 0;
-		sprite_visible = 1;
-	}
+    /* Erase the sprite if it was visible */
+    if (sprite_visible) {
+        updates[0] = position;
+        SDL_BlitSurface(backing, NULL, screen, &updates[0]);
+    } else {
+        updates[0].x = 0;
+        updates[0].y = 0;
+        updates[0].w = 0;
+        updates[0].h = 0;
+        sprite_visible = 1;
+    }
 
-	/* Since the sprite is off the screen, we can do other drawing
-	   without being overwritten by the saved area behind the sprite.
-	 */
-	if ( light != NULL ) {
-		int x, y;
+    /* Since the sprite is off the screen, we can do other drawing
+       without being overwritten by the saved area behind the sprite.
+     */
+    if (light != NULL) {
+        int x, y;
+
+        SDL_GetMouseState(&x, &y);
+        FlashLight(screen, light, x, y);
+    }
 
-		SDL_GetMouseState(&x, &y);
-		FlashLight(screen, light, x, y);
-	}
-	   
-	/* Move the sprite, bounce at the wall */
-	position.x += x_vel;
-	if ( (position.x < 0) || (position.x >= screen->w) ) {
-		x_vel = -x_vel;
-		position.x += x_vel;
-	}
-	position.y += y_vel;
-	if ( (position.y < 0) || (position.y >= screen->h) ) {
-		y_vel = -y_vel;
-		position.y += y_vel;
-	}
+    /* Move the sprite, bounce at the wall */
+    position.x += x_vel;
+    if ((position.x < 0) || (position.x >= screen->w)) {
+        x_vel = -x_vel;
+        position.x += x_vel;
+    }
+    position.y += y_vel;
+    if ((position.y < 0) || (position.y >= screen->h)) {
+        y_vel = -y_vel;
+        position.y += y_vel;
+    }
 
-	/* Update transparency (fade in and out) */
-	alpha = sprite->format->alpha;
-	if ( (alpha+alpha_vel) < 0 ) {
-		alpha_vel = -alpha_vel;
-	} else
-	if ( (alpha+alpha_vel) > 255 ) {
-		alpha_vel = -alpha_vel;
-	}
-	SDL_SetAlpha(sprite, SDL_SRCALPHA, (Uint8)(alpha+alpha_vel));
+    /* Update transparency (fade in and out) */
+    alpha = sprite->format->alpha;
+    if ((alpha + alpha_vel) < 0) {
+        alpha_vel = -alpha_vel;
+    } else if ((alpha + alpha_vel) > 255) {
+        alpha_vel = -alpha_vel;
+    }
+    SDL_SetAlpha(sprite, SDL_SRCALPHA, (Uint8) (alpha + alpha_vel));
 
-	/* Save the area behind the sprite */
-	updates[1] = position;
-	SDL_BlitSurface(screen, &updates[1], backing, NULL);
-	
-	/* Blit the sprite onto the screen */
-	updates[1] = position;
-	SDL_BlitSurface(sprite, NULL, screen, &updates[1]);
+    /* Save the area behind the sprite */
+    updates[1] = position;
+    SDL_BlitSurface(screen, &updates[1], backing, NULL);
 
-	/* Make it so! */
-	SDL_UpdateRects(screen, 2, updates);
+    /* Blit the sprite onto the screen */
+    updates[1] = position;
+    SDL_BlitSurface(sprite, NULL, screen, &updates[1]);
+
+    /* Make it so! */
+    SDL_UpdateRects(screen, 2, updates);
 }
 
-void WarpSprite(SDL_Surface *screen, int x, int y)
+void
+WarpSprite(SDL_Surface * screen, int x, int y)
 {
-	SDL_Rect updates[2];
+    SDL_Rect updates[2];
 
-	/* Erase, move, Draw, update */
-	updates[0] = position;
-	SDL_BlitSurface(backing, NULL, screen, &updates[0]);
-	position.x = x-sprite->w/2;	/* Center about X */
-	position.y = y-sprite->h/2;	/* Center about Y */
-	updates[1] = position;
-	SDL_BlitSurface(screen, &updates[1], backing, NULL);
-	updates[1] = position;
-	SDL_BlitSurface(sprite, NULL, screen, &updates[1]);
-	SDL_UpdateRects(screen, 2, updates);
+    /* Erase, move, Draw, update */
+    updates[0] = position;
+    SDL_BlitSurface(backing, NULL, screen, &updates[0]);
+    position.x = x - sprite->w / 2;     /* Center about X */
+    position.y = y - sprite->h / 2;     /* Center about Y */
+    updates[1] = position;
+    SDL_BlitSurface(screen, &updates[1], backing, NULL);
+    updates[1] = position;
+    SDL_BlitSurface(sprite, NULL, screen, &updates[1]);
+    SDL_UpdateRects(screen, 2, updates);
 }
 
-int main(int argc, char *argv[])
+int
+main(int argc, char *argv[])
 {
-	const SDL_VideoInfo *info;
-	SDL_Surface *screen;
-	int    w, h;
-	Uint8  video_bpp;
-	Uint32 videoflags;
-	int    i, done;
-	SDL_Event event;
-	SDL_Surface *light;
-	int mouse_pressed;
-	Uint32 ticks, lastticks;
+    const SDL_VideoInfo *info;
+    SDL_Surface *screen;
+    int w, h;
+    Uint8 video_bpp;
+    Uint32 videoflags;
+    int i, done;
+    SDL_Event event;
+    SDL_Surface *light;
+    int mouse_pressed;
+    Uint32 ticks, lastticks;
 
 
-	/* Initialize SDL */
-	if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
-		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
-		return(1);
-	}
+    /* Initialize SDL */
+    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
+        fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
+        return (1);
+    }
 
-	/* Alpha blending doesn't work well at 8-bit color */
+    /* Alpha blending doesn't work well at 8-bit color */
 #ifdef _WIN32_WCE
-	/* Pocket PC */
-	w = 240;
-	h = 320;
+    /* Pocket PC */
+    w = 240;
+    h = 320;
 #else
-	w = 640;
-	h = 480;
+    w = 640;
+    h = 480;
 #endif
-	info = SDL_GetVideoInfo();
-	if ( info->vfmt->BitsPerPixel > 8 ) {
-		video_bpp = info->vfmt->BitsPerPixel;
-	} else {
-		video_bpp = 16;
+    info = SDL_GetVideoInfo();
+    if (info->vfmt->BitsPerPixel > 8) {
+        video_bpp = info->vfmt->BitsPerPixel;
+    } else {
+        video_bpp = 16;
+        fprintf(stderr, "forced 16 bpp mode\n");
+    }
+    videoflags = SDL_SWSURFACE;
+    for (i = 1; argv[i]; ++i) {
+        if (strcmp(argv[i], "-bpp") == 0) {
+            video_bpp = atoi(argv[++i]);
+            if (video_bpp <= 8) {
+                video_bpp = 16;
                 fprintf(stderr, "forced 16 bpp mode\n");
-	}
-	videoflags = SDL_SWSURFACE;
-	for ( i = 1; argv[i]; ++i ) {
-		if ( strcmp(argv[i], "-bpp") == 0 ) {
-			video_bpp = atoi(argv[++i]);
-                        if (video_bpp<=8) {
-                            video_bpp=16;
-                            fprintf(stderr, "forced 16 bpp mode\n");
-                        }
-		} else
-		if ( strcmp(argv[i], "-hw") == 0 ) {
-			videoflags |= SDL_HWSURFACE;
-		} else
-		if ( strcmp(argv[i], "-warp") == 0 ) {
-			videoflags |= SDL_HWPALETTE;
-		} else
-		if ( strcmp(argv[i], "-width") == 0 && argv[i+1] ) {
-			w = atoi(argv[++i]);
-		} else
-		if ( strcmp(argv[i], "-height") == 0 && argv[i+1] ) {
-			h = atoi(argv[++i]);
-		} else
-		if ( strcmp(argv[i], "-resize") == 0 ) {
-			videoflags |= SDL_RESIZABLE;
-		} else
-		if ( strcmp(argv[i], "-noframe") == 0 ) {
-			videoflags |= SDL_NOFRAME;
-		} else
-		if ( strcmp(argv[i], "-fullscreen") == 0 ) {
-			videoflags |= SDL_FULLSCREEN;
-		} else {
-			fprintf(stderr, 
-			"Usage: %s [-width N] [-height N] [-bpp N] [-warp] [-hw] [-fullscreen]\n",
-								argv[0]);
-			quit(1);
-		}
-	}
+            }
+        } else if (strcmp(argv[i], "-hw") == 0) {
+            videoflags |= SDL_HWSURFACE;
+        } else if (strcmp(argv[i], "-warp") == 0) {
+            videoflags |= SDL_HWPALETTE;
+        } else if (strcmp(argv[i], "-width") == 0 && argv[i + 1]) {
+            w = atoi(argv[++i]);
+        } else if (strcmp(argv[i], "-height") == 0 && argv[i + 1]) {
+            h = atoi(argv[++i]);
+        } else if (strcmp(argv[i], "-resize") == 0) {
+            videoflags |= SDL_RESIZABLE;
+        } else if (strcmp(argv[i], "-noframe") == 0) {
+            videoflags |= SDL_NOFRAME;
+        } else if (strcmp(argv[i], "-fullscreen") == 0) {
+            videoflags |= SDL_FULLSCREEN;
+        } else {
+            fprintf(stderr,
+                    "Usage: %s [-width N] [-height N] [-bpp N] [-warp] [-hw] [-fullscreen]\n",
+                    argv[0]);
+            quit(1);
+        }
+    }
+
+    /* Set video mode */
+    if ((screen = SDL_SetVideoMode(w, h, video_bpp, videoflags)) == NULL) {
+        fprintf(stderr, "Couldn't set %dx%dx%d video mode: %s\n",
+                w, h, video_bpp, SDL_GetError());
+        quit(2);
+    }
+    FillBackground(screen);
 
-	/* Set video mode */
-	if ( (screen=SDL_SetVideoMode(w,h,video_bpp,videoflags)) == NULL ) {
-		fprintf(stderr, "Couldn't set %dx%dx%d video mode: %s\n",
-						w, h, video_bpp, SDL_GetError());
-		quit(2);
-	}
-	FillBackground(screen);
+    /* Create the light */
+    light = CreateLight(82);
+    if (light == NULL) {
+        quit(1);
+    }
 
-	/* Create the light */
-	light = CreateLight(82);
-	if ( light == NULL ) {
-		quit(1);
-	}
+    /* Load the sprite */
+    if (LoadSprite(screen, "icon.bmp") < 0) {
+        SDL_FreeSurface(light);
+        quit(1);
+    }
 
-	/* Load the sprite */
-	if ( LoadSprite(screen, "icon.bmp") < 0 ) {
-		SDL_FreeSurface(light);
-		quit(1);
-	}
+    /* Print out information about our surfaces */
+    printf("Screen is at %d bits per pixel\n", screen->format->BitsPerPixel);
+    if ((screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
+        printf("Screen is in video memory\n");
+    } else {
+        printf("Screen is in system memory\n");
+    }
+    if ((screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF) {
+        printf("Screen has double-buffering enabled\n");
+    }
+    if ((sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
+        printf("Sprite is in video memory\n");
+    } else {
+        printf("Sprite is in system memory\n");
+    }
 
-	/* Print out information about our surfaces */
-	printf("Screen is at %d bits per pixel\n",screen->format->BitsPerPixel);
-	if ( (screen->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
-		printf("Screen is in video memory\n");
-	} else {
-		printf("Screen is in system memory\n");
-	}
-	if ( (screen->flags & SDL_DOUBLEBUF) == SDL_DOUBLEBUF ) {
-		printf("Screen has double-buffering enabled\n");
-	}
-	if ( (sprite->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
-		printf("Sprite is in video memory\n");
-	} else {
-		printf("Sprite is in system memory\n");
-	}
+    /* Run a sample blit to trigger blit acceleration */
+    MoveSprite(screen, NULL);
+    if ((sprite->flags & SDL_HWACCEL) == SDL_HWACCEL) {
+        printf("Sprite blit uses hardware alpha acceleration\n");
+    } else {
+        printf("Sprite blit dosn't uses hardware alpha acceleration\n");
+    }
 
-	/* Run a sample blit to trigger blit acceleration */
-	MoveSprite(screen, NULL);
-	if ( (sprite->flags & SDL_HWACCEL) == SDL_HWACCEL ) {
-		printf("Sprite blit uses hardware alpha acceleration\n");
-	} else {
-		printf("Sprite blit dosn't uses hardware alpha acceleration\n");
-	}
-
-	/* Set a clipping rectangle to clip the outside edge of the screen */
-	{ SDL_Rect clip;
-		clip.x = 32;
-		clip.y = 32;
-		clip.w = screen->w-(2*32);
-		clip.h = screen->h-(2*32);
-		SDL_SetClipRect(screen, &clip);
-	}
+    /* Set a clipping rectangle to clip the outside edge of the screen */
+    {
+        SDL_Rect clip;
+        clip.x = 32;
+        clip.y = 32;
+        clip.w = screen->w - (2 * 32);
+        clip.h = screen->h - (2 * 32);
+        SDL_SetClipRect(screen, &clip);
+    }
 
-	/* Wait for a keystroke */
-	lastticks = SDL_GetTicks();
-	done = 0;
-	mouse_pressed = 0;
-	while ( !done ) {
-		/* Update the frame -- move the sprite */
-		if ( mouse_pressed ) {
-			MoveSprite(screen, light);
-			mouse_pressed = 0;
-		} else {
-			MoveSprite(screen, NULL);
-		}
+    /* Wait for a keystroke */
+    lastticks = SDL_GetTicks();
+    done = 0;
+    mouse_pressed = 0;
+    while (!done) {
+        /* Update the frame -- move the sprite */
+        if (mouse_pressed) {
+            MoveSprite(screen, light);
+            mouse_pressed = 0;
+        } else {
+            MoveSprite(screen, NULL);
+        }
 
-		/* Slow down the loop to 30 frames/second */
-		ticks = SDL_GetTicks();
-		if ( (ticks-lastticks) < FRAME_TICKS ) {
+        /* Slow down the loop to 30 frames/second */
+        ticks = SDL_GetTicks();
+        if ((ticks - lastticks) < FRAME_TICKS) {
 #ifdef CHECK_SLEEP_GRANULARITY
-fprintf(stderr, "Sleeping %d ticks\n", FRAME_TICKS-(ticks-lastticks));
+            fprintf(stderr, "Sleeping %d ticks\n",
+                    FRAME_TICKS - (ticks - lastticks));
 #endif
-			SDL_Delay(FRAME_TICKS-(ticks-lastticks));
+            SDL_Delay(FRAME_TICKS - (ticks - lastticks));
 #ifdef CHECK_SLEEP_GRANULARITY
-fprintf(stderr, "Slept %d ticks\n", (SDL_GetTicks()-ticks));
+            fprintf(stderr, "Slept %d ticks\n", (SDL_GetTicks() - ticks));
 #endif
-		}
-		lastticks = ticks;
+        }
+        lastticks = ticks;
 
-		/* Check for events */
-		while ( SDL_PollEvent(&event) ) {
-			switch (event.type) {
-				case SDL_VIDEORESIZE:
-					screen = SDL_SetVideoMode(event.resize.w, event.resize.h, video_bpp, videoflags);
-					if ( screen ) {
-						FillBackground(screen);
-					}
-					break;
-				/* Attract sprite while mouse is held down */
-				case SDL_MOUSEMOTION:
-					if (event.motion.state != 0) {
-						AttractSprite(event.motion.x,
-								event.motion.y);
-						mouse_pressed = 1;
-					}
-					break;
-				case SDL_MOUSEBUTTONDOWN:
-					if ( event.button.button == 1 ) {
-						AttractSprite(event.button.x,
-						              event.button.y);
-						mouse_pressed = 1;
-					} else {
-						SDL_Rect area;
+        /* Check for events */
+        while (SDL_PollEvent(&event)) {
+            switch (event.type) {
+            case SDL_VIDEORESIZE:
+                screen =
+                    SDL_SetVideoMode(event.resize.w, event.resize.h,
+                                     video_bpp, videoflags);
+                if (screen) {
+                    FillBackground(screen);
+                }
+                break;
+                /* Attract sprite while mouse is held down */
+            case SDL_MOUSEMOTION:
+                if (event.motion.state != 0) {
+                    AttractSprite(event.motion.x, event.motion.y);
+                    mouse_pressed = 1;
+                }
+                break;
+            case SDL_MOUSEBUTTONDOWN:
+                if (event.button.button == 1) {
+                    AttractSprite(event.button.x, event.button.y);
+                    mouse_pressed = 1;
+                } else {
+                    SDL_Rect area;
 
-						area.x = event.button.x-16;
-						area.y = event.button.y-16;
-						area.w = 32;
-						area.h = 32;
-						SDL_FillRect(screen, &area, 0);
-						SDL_UpdateRects(screen,1,&area);
-					}
-					break;
-				case SDL_KEYDOWN:
-					if ( event.key.keysym.sym == SDLK_ESCAPE ) {
-						done = 1;
-					}
-					break;
-				case SDL_QUIT:
-					done = 1;
-					break;
-				default:
-					break;
-			}
-		}
-	}
-	SDL_FreeSurface(light);
-	SDL_FreeSurface(sprite);
-	SDL_FreeSurface(backing);
+                    area.x = event.button.x - 16;
+                    area.y = event.button.y - 16;
+                    area.w = 32;
+                    area.h = 32;
+                    SDL_FillRect(screen, &area, 0);
+                    SDL_UpdateRects(screen, 1, &area);
+                }
+                break;
+            case SDL_KEYDOWN:
+                if (event.key.keysym.sym == SDLK_ESCAPE) {
+                    done = 1;
+                }
+                break;
+            case SDL_QUIT:
+                done = 1;
+                break;
+            default:
+                break;
+            }
+        }
+    }
+    SDL_FreeSurface(light);
+    SDL_FreeSurface(sprite);
+    SDL_FreeSurface(backing);
 
-	/* Print out some timing information */
-	if ( flashes > 0 ) {
-		printf("%d alpha blits, ~%4.4f ms per blit\n", 
-			flashes, (float)flashtime/flashes);
-	}
+    /* Print out some timing information */
+    if (flashes > 0) {
+        printf("%d alpha blits, ~%4.4f ms per blit\n",
+               flashes, (float) flashtime / flashes);
+    }
 
-	SDL_Quit();
-	return(0);
+    SDL_Quit();
+    return (0);
 }