/* Bring up a window and play with it */

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#define BENCHMARK_SDL

#define NOTICE(X)	printf("%s", X);

#include "SDL.h"

void DrawPict(SDL_Surface *screen, char *bmpfile,

					int speedy, int flip, int nofade)

{

	SDL_Surface *picture;

	SDL_Rect dest, update;

	int i, centered;

	int ncolors;

	SDL_Color *colors, *cmap;

	/* Load the image into a surface */

	if ( bmpfile == NULL ) {

		bmpfile = "sample.bmp";		/* Sample image */

	}

fprintf(stderr, "Loading picture: %s\n", bmpfile);

	picture = SDL_LoadBMP(bmpfile);

	if ( picture == NULL ) {

		fprintf(stderr, "Couldn't load %s: %s\n", bmpfile,

							SDL_GetError());

		return;

	}

	/* Set the display colors -- on a hicolor display this is a no-op */

	if ( picture->format->palette ) {

		ncolors = picture->format->palette->ncolors;

		colors  = (SDL_Color *)malloc(ncolors*sizeof(SDL_Color));

		cmap    = (SDL_Color *)malloc(ncolors*sizeof(SDL_Color));

		memcpy(colors, picture->format->palette->colors,

						ncolors*sizeof(SDL_Color));

	} else {

		int       r, g, b;

		/* Allocate 256 color palette */

		ncolors = 256;

		colors  = (SDL_Color *)malloc(ncolors*sizeof(SDL_Color));

		cmap    = (SDL_Color *)malloc(ncolors*sizeof(SDL_Color));

		/* Set a 3,3,2 color cube */

		for ( r=0; r<8; ++r ) {

			for ( g=0; g<8; ++g ) {

				for ( b=0; b<4; ++b ) {

					i = ((r<<5)|(g<<2)|b);

					colors[i].r = r<<5;

					colors[i].g = g<<5;

					colors[i].b = b<<6;

				}

			}

		}

	}

NOTICE("testwin: setting colors\n");

	if ( ! SDL_SetColors(screen, colors, 0, ncolors) &&

				(screen->format->palette != NULL) ) {

		fprintf(stderr,

"Warning: Couldn't set all of the colors, but SDL will map the image\n"

"         (colormap fading will suffer - try the -warp option)\n"

		);

	}

	/* Set the screen to black (not really necessary) */

	if ( SDL_LockSurface(screen) == 0 ) {

		Uint32 black;

		Uint8 *pixels;

		black = SDL_MapRGB(screen->format, 0, 0, 0);

		pixels = (Uint8 *)screen->pixels;

		for ( i=0; i<screen->h; ++i ) {

			memset(pixels, black,

				screen->w*screen->format->BytesPerPixel);

			pixels += screen->pitch;

		}

		SDL_UnlockSurface(screen);

		SDL_UpdateRect(screen, 0, 0, 0, 0);

	}

	/* Display the picture */

	if ( speedy ) {

		SDL_Surface *displayfmt;

fprintf(stderr, "Converting picture\n");

		displayfmt = SDL_DisplayFormat(picture);

		if ( displayfmt == NULL ) {

			fprintf(stderr,

				"Couldn't convert image: %s\n", SDL_GetError());

			goto done;

		}

		SDL_FreeSurface(picture);

		picture = displayfmt;

	}

	printf("(image surface located in %s memory)\n", 

			(picture->flags&SDL_HWSURFACE) ? "video" : "system");

	centered = (screen->w - picture->w)/2;

	if ( centered < 0 ) {

		centered = 0;

	}

	dest.y = (screen->h - picture->h)/2;

	dest.w = picture->w;

	dest.h = picture->h;

NOTICE("testwin: moving image\n");

	for ( i=0; i<=centered; ++i ) {

		dest.x = i;

		update = dest;

		if ( SDL_BlitSurface(picture, NULL, screen, &update) < 0 ) {

			fprintf(stderr, "Blit failed: %s\n", SDL_GetError());

			break;

		}

		if ( flip ) {

			SDL_Flip(screen);

		} else {

			SDL_UpdateRects(screen, 1, &update);

		}

	}

#ifdef SCREENSHOT

	if ( SDL_SaveBMP(screen, "screen.bmp") < 0 )

		printf("Couldn't save screen: %s\n", SDL_GetError());

#endif

#ifndef BENCHMARK_SDL

	/* Let it sit there for a while */

	SDL_Delay(5*1000);

#endif

	/* Fade the colormap */

	if ( ! nofade ) {

		int maxstep;

		SDL_Color final;

		SDL_Color palcolors[256];

		struct {

			Sint16 r, g, b;

		} cdist[256];

NOTICE("testwin: fading out...\n");

		memcpy(cmap, colors, ncolors*sizeof(SDL_Color));

		maxstep = 32-1;

		final.r = 0xFF;

		final.g = 0x00;

		final.b = 0x00;

		memcpy(palcolors, colors, ncolors*sizeof(SDL_Color));

		for ( i=0; i<ncolors; ++i ) {

			cdist[i].r = final.r-palcolors[i].r;

			cdist[i].g = final.g-palcolors[i].g;

			cdist[i].b = final.b-palcolors[i].b;

		}

		for ( i=0; i<=maxstep/2; ++i ) {	/* halfway fade */

			int c;

			for ( c=0; c<ncolors; ++c ) {

				colors[c].r =

					palcolors[c].r+((cdist[c].r*i))/maxstep;

				colors[c].g =

					palcolors[c].g+((cdist[c].g*i))/maxstep;

				colors[c].b =

					palcolors[c].b+((cdist[c].b*i))/maxstep;

			}

			SDL_SetColors(screen, colors, 0, ncolors);

			SDL_Delay(1);

		}

		final.r = 0x00;

		final.g = 0x00;

		final.b = 0x00;

		memcpy(palcolors, colors, ncolors*sizeof(SDL_Color));

		for ( i=0; i<ncolors; ++i ) {

			cdist[i].r = final.r-palcolors[i].r;

			cdist[i].g = final.g-palcolors[i].g;

			cdist[i].b = final.b-palcolors[i].b;

		}

		maxstep /= 2;

		for ( i=0; i<=maxstep; ++i ) {		/* finish fade out */

			int c;

			for ( c=0; c<ncolors; ++c ) {

				colors[c].r =

					palcolors[c].r+((cdist[c].r*i))/maxstep;

				colors[c].g =

					palcolors[c].g+((cdist[c].g*i))/maxstep;

				colors[c].b =

					palcolors[c].b+((cdist[c].b*i))/maxstep;

			}

			SDL_SetColors(screen, colors, 0, ncolors);

			SDL_Delay(1);

		}

		for ( i=0; i<ncolors; ++i ) {

			colors[i].r = final.r;

			colors[i].g = final.g;

			colors[i].b = final.b;

		}

		SDL_SetColors(screen, colors, 0, ncolors);

NOTICE("testwin: fading in...\n");

		memcpy(palcolors, colors, ncolors*sizeof(SDL_Color));

		for ( i=0; i<ncolors; ++i ) {

			cdist[i].r = cmap[i].r-palcolors[i].r;

			cdist[i].g = cmap[i].g-palcolors[i].g;

			cdist[i].b = cmap[i].b-palcolors[i].b;

		}

		for ( i=0; i<=maxstep; ++i ) {	/* 32 step fade in */

			int c;

			for ( c=0; c<ncolors; ++c ) {

				colors[c].r =

					palcolors[c].r+((cdist[c].r*i))/maxstep;

				colors[c].g =

					palcolors[c].g+((cdist[c].g*i))/maxstep;

				colors[c].b =

					palcolors[c].b+((cdist[c].b*i))/maxstep;

			}

			SDL_SetColors(screen, colors, 0, ncolors);

			SDL_Delay(1);

		}

NOTICE("testwin: fading over\n");

	}

done:

	/* Free the picture and return */

	SDL_FreeSurface(picture);

	free(colors); free(cmap);

	return;

}

int main(int argc, char *argv[])

{

	SDL_Surface *screen;

	/* Options */

	int speedy, flip, nofade;

	int delay;

	int w, h;

	int desired_bpp;

	Uint32 video_flags;

#ifdef BENCHMARK_SDL

	Uint32 then, now;

#endif

	/* Set default options and check command-line */

	speedy = 0;

	flip = 0;

	nofade = 0;

	delay = 1;

	w = 640;

	h = 480;

	desired_bpp = 0;

	video_flags = 0;

	while ( argc > 1 ) {

		if ( strcmp(argv[1], "-speedy") == 0 ) {

			speedy = 1;

			argv += 1;

			argc -= 1;

		} else

		if ( strcmp(argv[1], "-nofade") == 0 ) {

			nofade = 1;

			argv += 1;

			argc -= 1;

		} else

		if ( strcmp(argv[1], "-delay") == 0 ) {

			if ( argv[2] ) {

				delay = atoi(argv[2]);

				argv += 2;

				argc -= 2;

			} else {

				fprintf(stderr,

				"The -delay option requires an argument\n");

				exit(1);

			}

		} else

		if ( strcmp(argv[1], "-width") == 0 ) {

			if ( argv[2] && ((w = atoi(argv[2])) > 0) ) {

				argv += 2;

				argc -= 2;

			} else {

				fprintf(stderr,

				"The -width option requires an argument\n");

				exit(1);

			}

		} else

		if ( strcmp(argv[1], "-height") == 0 ) {

			if ( argv[2] && ((h = atoi(argv[2])) > 0) ) {

				argv += 2;

				argc -= 2;

			} else {

				fprintf(stderr,

				"The -height option requires an argument\n");

				exit(1);

			}

		} else

		if ( strcmp(argv[1], "-bpp") == 0 ) {

			if ( argv[2] ) {

				desired_bpp = atoi(argv[2]);

				argv += 2;

				argc -= 2;

			} else {

				fprintf(stderr,

				"The -bpp option requires an argument\n");

				exit(1);

			}

		} else

		if ( strcmp(argv[1], "-warp") == 0 ) {

			video_flags |= SDL_HWPALETTE;

			argv += 1;

			argc -= 1;

		} else

		if ( strcmp(argv[1], "-hw") == 0 ) {

			video_flags |= SDL_HWSURFACE;

			argv += 1;

			argc -= 1;

		} else

		if ( strcmp(argv[1], "-flip") == 0 ) {

			video_flags |= SDL_DOUBLEBUF;

			argv += 1;

			argc -= 1;

		} else

		if ( strcmp(argv[1], "-fullscreen") == 0 ) {

			video_flags |= SDL_FULLSCREEN;

			argv += 1;

			argc -= 1;

		} else

			break;

	}

	if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {

		fprintf(stderr,

			"Couldn't initialize SDL: %s\n", SDL_GetError());

		exit(1);

	}

	atexit(SDL_Quit);			/* Clean up on exit */

	/* Initialize the display */

	screen = SDL_SetVideoMode(w, h, desired_bpp, video_flags);

	if ( screen == NULL ) {

		fprintf(stderr, "Couldn't set %dx%dx%d video mode: %s\n",

					w, h, desired_bpp, SDL_GetError());

		exit(1);

	}

	printf("Set %dx%dx%d mode\n",

			screen->w, screen->h, screen->format->BitsPerPixel);

	printf("(video surface located in %s memory)\n",

			(screen->flags&SDL_HWSURFACE) ? "video" : "system");

	if ( screen->flags & SDL_DOUBLEBUF ) {

		printf("Double-buffering enabled\n");

		flip = 1;

	}

	/* Set the window manager title bar */

	SDL_WM_SetCaption("SDL test window", "testwin");

	/* Do all the drawing work */

#ifdef BENCHMARK_SDL

	then = SDL_GetTicks();

	DrawPict(screen, argv[1], speedy, flip, nofade);

	now = SDL_GetTicks();

	printf("Time: %d milliseconds\n", now-then);

#else

	DrawPict(screen, argv[1], speedy, flip, nofade);

#endif

	SDL_Delay(delay*1000);

	return(0);

}