testrotozoom.c

sdl的gfx开发包

/* 

    SDL_rotozoom - test program 

    Copyright (C) A. Schiffler, July 2001

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

#ifdef WIN32
 #include <windows.h>
#endif

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <SDL/SDL.h>

#include "SDL/SDL_rotozoom.h"

void HandleEvent()
{
	SDL_Event event; 

	/* Check for events */
        while ( SDL_PollEvent(&event) ) {
                        switch (event.type) {
			 case SDL_KEYDOWN:
			 case SDL_QUIT:
                                        exit(0);
                                        break;
			}
	}
}

void ClearScreen(SDL_Surface *screen)
{
	int i;
	/* Set the screen to black */
	if ( SDL_LockSurface(screen) == 0 ) {
		Uint8 *pixels;
		pixels = (Uint8 *)screen->pixels;
		for ( i=0; i<screen->h; ++i ) {
			memset(pixels, 0,
				screen->w*screen->format->BytesPerPixel);
			pixels += screen->pitch;
		}
		SDL_UnlockSurface(screen);
	}
}

void RotatePicture (SDL_Surface *screen, SDL_Surface *picture, int rotate, int smooth) 
{
	SDL_Surface *rotozoom_picture;
	SDL_Rect dest;
	int framecount, framemax, frameinc;
	float zoomf;

	/* Rotate and display the picture */
	framemax=4*360; frameinc=1;
	for (framecount=360; framecount<framemax; framecount += frameinc) {
		if ((framecount % 360)==0) frameinc++;
		HandleEvent();
		ClearScreen(screen);
                zoomf=(float)framecount/(float)framemax;
                zoomf=1.5*zoomf*zoomf;
		if ((rotozoom_picture=rotozoomSurface (picture, framecount*rotate, zoomf, smooth))!=NULL) {
			dest.x = (screen->w - rotozoom_picture->w)/2;;
			dest.y = (screen->h - rotozoom_picture->h)/2;
			dest.w = rotozoom_picture->w;
			dest.h = rotozoom_picture->h;
			if ( SDL_BlitSurface(rotozoom_picture, NULL, screen, &dest) < 0 ) {
				fprintf(stderr, "Blit failed: %s\n", SDL_GetError());
				break;
			}
			SDL_FreeSurface(rotozoom_picture);
		}

		/* Display by flipping screens */
		SDL_UpdateRect(screen,0,0,0,0);
	}
	
	if (rotate) {
		/* Final display with angle=0 */
		HandleEvent();
		ClearScreen(screen);
		if ((rotozoom_picture=rotozoomSurface (picture, 0.01, zoomf, smooth))!=NULL) {
			dest.x = (screen->w - rotozoom_picture->w)/2;;
			dest.y = (screen->h - rotozoom_picture->h)/2;
			dest.w = rotozoom_picture->w;
			dest.h = rotozoom_picture->h;
			if ( SDL_BlitSurface(rotozoom_picture, NULL, screen, &dest) < 0 ) {
				fprintf(stderr, "Blit failed: %s\n", SDL_GetError());
				return;
			}
			SDL_FreeSurface(rotozoom_picture);
		}		
	
		/* Display by flipping screens */
		SDL_UpdateRect(screen,0,0,0,0);
	}

	/* Pause for a sec */
	SDL_Delay(1000);
}

void ZoomPicture (SDL_Surface *screen, SDL_Surface *picture, int smooth) 
{
	SDL_Surface *rotozoom_picture;
	SDL_Rect dest;
	int framecount, framemax, frameinc;
	float zoomxf,zoomyf;

	/* Zoom and display the picture */
	framemax=4*360; frameinc=1;
	for (framecount=360; framecount<framemax; framecount += frameinc) {
		if ((framecount % 360)==0) frameinc++;
		HandleEvent();
		ClearScreen(screen);
                zoomxf=(float)framecount/(float)framemax;
                zoomxf=1.5*zoomxf*zoomxf;
                zoomyf=0.5+fabs(1.0*sin((double)framecount/80.0));
		if ((rotozoom_picture=zoomSurface (picture, zoomxf, zoomyf, smooth))!=NULL) {
			dest.x = (screen->w - rotozoom_picture->w)/2;;
			dest.y = (screen->h - rotozoom_picture->h)/2;
			dest.w = rotozoom_picture->w;
			dest.h = rotozoom_picture->h;
			if ( SDL_BlitSurface(rotozoom_picture, NULL, screen, &dest) < 0 ) {
				fprintf(stderr, "Blit failed: %s\n", SDL_GetError());
				break;
			}
			SDL_FreeSurface(rotozoom_picture);
		}

		/* Display by flipping screens */
		SDL_UpdateRect(screen,0,0,0,0);
	}
	
	/* Pause for a sec */
	SDL_Delay(1000);
}

void Draw (SDL_Surface *screen)
{
	SDL_Surface *picture, *picture_again;
	char *bmpfile;

	/* --------- 8 bit test -------- */

	/* Message */
        fprintf (stderr,"Loading 8bit image\n");

	/* Load the image into a surface */
	bmpfile = "sample8.bmp";
	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;
	}

	fprintf (stderr,"1.  rotozoom: Rotating and zooming\n");
	RotatePicture(screen,picture,1,SMOOTHING_OFF);

	fprintf (stderr,"2.  rotozoom: Just zooming (angle=0)\n");
	RotatePicture(screen,picture,0,SMOOTHING_OFF);

	fprintf (stderr,"3.  zoom: Just zooming\n");
	ZoomPicture(screen,picture,SMOOTHING_OFF);


	fprintf (stderr,"4.  rotozoom: Rotating and zooming, interpolation on but unused\n");
	RotatePicture(screen,picture,1,SMOOTHING_ON);

	fprintf (stderr,"5.  rotozoom: Just zooming (angle=0), interpolation on but unused\n");
	RotatePicture(screen,picture,0,SMOOTHING_ON);

	fprintf (stderr,"6.  zoom: Just zooming, interpolation on but unused\n");
	ZoomPicture(screen,picture,SMOOTHING_ON);

	/* Free the picture */
	SDL_FreeSurface(picture);

	/* -------- 24 bit test --------- */

	/* Message */
        fprintf (stderr,"Loading 24bit image\n");
	/* Load the image into a surface */
	bmpfile = "sample24.bmp";
	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;
	}

	fprintf (stderr,"7.  rotozoom: Rotating and zooming, no interpolation\n");
	RotatePicture(screen,picture,1,SMOOTHING_OFF);

	fprintf (stderr,"8.  rotozoom: Just zooming (angle=0), no interpolation\n");
	RotatePicture(screen,picture,0,SMOOTHING_OFF);

	fprintf (stderr,"9.  zoom: Just zooming, no interpolation\n");
	ZoomPicture(screen,picture,SMOOTHING_OFF);


	fprintf (stderr,"10. rotozoom: Rotating and zooming, with interpolation\n");
	RotatePicture(screen,picture,1,SMOOTHING_ON);

	fprintf (stderr,"11. rotozoom: Just zooming (angle=0), with interpolation\n");
	RotatePicture(screen,picture,0,SMOOTHING_ON);

	fprintf (stderr,"12. zoom: Just zooming, with interpolation\n");
	ZoomPicture(screen,picture,SMOOTHING_ON);


  	/* New source surface is 32bit with defined RGBA ordering */
	/* Much faster to do this once rather than the routine on the fly */
	fprintf (stderr,"Converting 24bit image into 32bit RGBA surface ...\n");
  	picture_again = SDL_CreateRGBSurface(SDL_SWSURFACE, picture->w, picture->h, 32, 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000);
	SDL_BlitSurface(picture,NULL,picture_again,NULL);

	/* Message */
	fprintf (stderr,"13. Rotating and zooming, with interpolation\n");
	RotatePicture(screen,picture_again,1,SMOOTHING_ON);

	/* Message */
	fprintf (stderr,"14. Just zooming (angle=0), with interpolation\n");
	RotatePicture(screen,picture_again,0,SMOOTHING_ON);

	SDL_FreeSurface(picture_again);

  	/* New source surface is 32bit with defined ABGR ordering */
	/* Much faster to do this once rather than the routine on the fly */
	fprintf (stderr,"Converting 24bit image into 32bit ABGR surface ...\n");
  	picture_again = SDL_CreateRGBSurface(SDL_SWSURFACE, picture->w, picture->h, 32, 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000);
	SDL_BlitSurface(picture,NULL,picture_again,NULL);

	/* Message */
	fprintf (stderr,"15. Rotating and zooming, with interpolation\n");
	RotatePicture(screen,picture_again,1,SMOOTHING_ON);

	/* Message */
	fprintf (stderr,"16. Just zooming (angle=0), with interpolation\n");
	RotatePicture(screen,picture_again,0,SMOOTHING_ON);

	SDL_FreeSurface(picture_again);

	/* Free the picture */
	SDL_FreeSurface(picture);
	
	return;
}

#ifdef WIN32
 extern char ** __argv;
 extern int __argc;
 int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
#else // non WIN32
 int main ( int argc, char *argv[] )
#endif
{
	SDL_Surface *screen;
	int w, h;
	int desired_bpp;
	Uint32 video_flags;
#ifdef WIN32
	int argc;
	char **argv;

	argv = __argv;
	argc = __argc;
#endif
	/* Title */
	fprintf (stderr,"SDL_rotozoom test\n");

	/* Set default options and check command-line */
	w = 640;
	h = 480;
	desired_bpp = 0;
	video_flags = 0;
	while ( argc > 1 ) {
		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], "-fullscreen") == 0 ) {
			video_flags |= SDL_FULLSCREEN;
			argv += 1;
			argc -= 1;
		} else
			break;
	}

	/* Force double buffering */
	video_flags |= SDL_DOUBLEBUF;

	/* Initialize SDL */
	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);
	}

	/* Show some info */
	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");
	
	/* Check for double buffering */
	if ( screen->flags & SDL_DOUBLEBUF ) {
		printf("Double-buffering enabled - good!\n");
	}

	/* Set the window manager title bar */
	SDL_WM_SetCaption("SDL_rotozoom test", "rotozoom");

	/* Do all the drawing work */
	Draw (screen);
	
	return(0);
}