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Fixed bug #38 I'm using SDL 1.2.9 with Visual C++ 7.0 on Windows 2000. Here's the setup: my game starts in a window, with SDL_WM_GrabInput(SDL_GRAB_ON) to constrain the cursor to the game window. The mouse cursor is outside of the window when the game launches, and when the window appears the cursor is grabbed and placed at the top left corner of the inside of the game window. At this point, if I click the mouse without moving it, the SDL_MOUSEBUTTONDOWN event's mouse coordinates are (65535,65535).
author Sam Lantinga <slouken@libsdl.org>
date Tue, 14 Mar 2006 06:00:30 +0000
parents 4d3bb026cd16
children 782fd950bd46 c121d94672cb
line wrap: on
line source


/* 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);

#define WINDOW_WIDTH  640
#define WINDOW_HEIGHT 480

#include "SDL.h"

SDL_Surface *screen, *pic;
SDL_Overlay *overlay;
int scale;
int monochrome;
int luminance;
int w, h;

/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void quit(int rc)
{
	SDL_Quit();
	exit(rc);
}

/* NOTE: These RGB conversion functions are not intended for speed,
         only as examples.
*/

void RGBtoYUV(Uint8 *rgb, int *yuv, int monochrome, int luminance)
{
    if (monochrome)
    {
#if 1 /* these are the two formulas that I found on the FourCC site... */
        yuv[0] = 0.299*rgb[0] + 0.587*rgb[1] + 0.114*rgb[2];
        yuv[1] = 128;
        yuv[2] = 128;
#else
        yuv[0] = (0.257 * rgb[0]) + (0.504 * rgb[1]) + (0.098 * rgb[2]) + 16;
        yuv[1] = 128;
        yuv[2] = 128;
#endif
    }
    else
    {
#if 1 /* these are the two formulas that I found on the FourCC site... */
        yuv[0] = 0.299*rgb[0] + 0.587*rgb[1] + 0.114*rgb[2];
        yuv[1] = (rgb[2]-yuv[0])*0.565 + 128;
        yuv[2] = (rgb[0]-yuv[0])*0.713 + 128;
#else
        yuv[0] = (0.257 * rgb[0]) + (0.504 * rgb[1]) + (0.098 * rgb[2]) + 16;
        yuv[1] = 128 - (0.148 * rgb[0]) - (0.291 * rgb[1]) + (0.439 * rgb[2]);
        yuv[2] = 128 + (0.439 * rgb[0]) - (0.368 * rgb[1]) - (0.071 * rgb[2]);
#endif
    }

    if (luminance!=100)
    {
        yuv[0]=yuv[0]*luminance/100;
        if (yuv[0]>255)
            yuv[0]=255;
    }

    /* clamp values...if you need to, we don't seem to have a need */
    /*
    for(i=0;i<3;i++)
    {
        if(yuv[i]<0)
            yuv[i]=0;
        if(yuv[i]>255)
            yuv[i]=255;
    }
    */
}

void ConvertRGBtoYV12(SDL_Surface *s, SDL_Overlay *o, int monochrome, int luminance)
{
	int x,y;
	int yuv[3];
	Uint8 *p,*op[3];

	SDL_LockSurface(s);
	SDL_LockYUVOverlay(o);

	/* Black initialization */
	/*
	memset(o->pixels[0],0,o->pitches[0]*o->h);
	memset(o->pixels[1],128,o->pitches[1]*((o->h+1)/2));
	memset(o->pixels[2],128,o->pitches[2]*((o->h+1)/2));
	*/

	/* Convert */
	for(y=0; y<s->h && y<o->h; y++)
	{
		p=((Uint8 *) s->pixels)+s->pitch*y;
		op[0]=o->pixels[0]+o->pitches[0]*y;
		op[1]=o->pixels[1]+o->pitches[1]*(y/2);
		op[2]=o->pixels[2]+o->pitches[2]*(y/2);
		for(x=0; x<s->w && x<o->w; x++)
		{
			RGBtoYUV(p, yuv, monochrome, luminance);
			*(op[0]++)=yuv[0];
			if(x%2==0 && y%2==0)
			{
				*(op[1]++)=yuv[2];
				*(op[2]++)=yuv[1];
			}
			p+=s->format->BytesPerPixel;
		}
	}

	SDL_UnlockYUVOverlay(o);
	SDL_UnlockSurface(s);
}

void ConvertRGBtoIYUV(SDL_Surface *s, SDL_Overlay *o, int monochrome, int luminance)
{
	int x,y;
	int yuv[3];
	Uint8 *p,*op[3];

	SDL_LockSurface(s);
	SDL_LockYUVOverlay(o);

	/* Black initialization */
	/*
	memset(o->pixels[0],0,o->pitches[0]*o->h);
	memset(o->pixels[1],128,o->pitches[1]*((o->h+1)/2));
	memset(o->pixels[2],128,o->pitches[2]*((o->h+1)/2));
	*/

	/* Convert */
	for(y=0; y<s->h && y<o->h; y++)
	{
		p=((Uint8 *) s->pixels)+s->pitch*y;
		op[0]=o->pixels[0]+o->pitches[0]*y;
		op[1]=o->pixels[1]+o->pitches[1]*(y/2);
		op[2]=o->pixels[2]+o->pitches[2]*(y/2);
		for(x=0; x<s->w && x<o->w; x++)
		{
			RGBtoYUV(p,yuv, monochrome, luminance);
			*(op[0]++)=yuv[0];
			if(x%2==0 && y%2==0)
			{
				*(op[1]++)=yuv[1];
				*(op[2]++)=yuv[2];
			}
			p+=s->format->BytesPerPixel;
		}
	}

	SDL_UnlockYUVOverlay(o);
	SDL_UnlockSurface(s);
}

void ConvertRGBtoUYVY(SDL_Surface *s, SDL_Overlay *o, int monochrome, int luminance)
{
	int x,y;
	int yuv[3];
	Uint8 *p,*op;

	SDL_LockSurface(s);
	SDL_LockYUVOverlay(o);

	for(y=0; y<s->h && y<o->h; y++)
	{
		p=((Uint8 *) s->pixels)+s->pitch*y;
		op=o->pixels[0]+o->pitches[0]*y;
		for(x=0; x<s->w && x<o->w; x++)
		{
			RGBtoYUV(p, yuv, monochrome, luminance);
			if(x%2==0)
			{
				*(op++)=yuv[1];
				*(op++)=yuv[0];
				*(op++)=yuv[2];
			}
			else
				*(op++)=yuv[0];

			p+=s->format->BytesPerPixel;
		}
	}

	SDL_UnlockYUVOverlay(o);
	SDL_UnlockSurface(s);
}

void ConvertRGBtoYVYU(SDL_Surface *s, SDL_Overlay *o, int monochrome, int luminance)
{
	int x,y;
	int yuv[3];
	Uint8 *p,*op;

	SDL_LockSurface(s);
	SDL_LockYUVOverlay(o);

	for(y=0; y<s->h && y<o->h; y++)
	{
		p=((Uint8 *) s->pixels)+s->pitch*y;
		op=o->pixels[0]+o->pitches[0]*y;
		for(x=0; x<s->w && x<o->w; x++)
		{
			RGBtoYUV(p,yuv, monochrome, luminance);
			if(x%2==0)
			{
				*(op++)=yuv[0];
				*(op++)=yuv[2];
				op[1]=yuv[1];
			}
			else
			{
				*op=yuv[0];
				op+=2;
			}

			p+=s->format->BytesPerPixel;
		}
	}

	SDL_UnlockYUVOverlay(o);
	SDL_UnlockSurface(s);
}

void ConvertRGBtoYUY2(SDL_Surface *s, SDL_Overlay *o, int monochrome, int luminance)
{
	int x,y;
	int yuv[3];
	Uint8 *p,*op;

	SDL_LockSurface(s);
	SDL_LockYUVOverlay(o);

	for(y=0; y<s->h && y<o->h; y++)
	{
		p=((Uint8 *) s->pixels)+s->pitch*y;
		op=o->pixels[0]+o->pitches[0]*y;
		for(x=0; x<s->w && x<o->w; x++)
		{
			RGBtoYUV(p,yuv, monochrome, luminance);
			if(x%2==0)
			{
				*(op++)=yuv[0];
				*(op++)=yuv[1];
				op[1]=yuv[2];
			}
			else
			{
				*op=yuv[0];
				op+=2;
			}

			p+=s->format->BytesPerPixel;
		}
	}

	SDL_UnlockYUVOverlay(o);
	SDL_UnlockSurface(s);
}

void Draw()
{
	SDL_Rect rect;
	int i;
        int disp;

	if(!scale)
	{
		rect.w=overlay->w;
		rect.h=overlay->h;
		for(i=0; i<h-rect.h && i<w-rect.w; i++)
		{
			rect.x=i;
			rect.y=i;
			SDL_DisplayYUVOverlay(overlay,&rect);
		}
	}
	else
	{
		rect.w=overlay->w/2;
		rect.h=overlay->h/2;
		rect.x=(w-rect.w)/2;
		rect.y=(h-rect.h)/2;
                disp=rect.y-1;
		for(i=0; i<disp; i++)
		{
                        rect.w+=2;
                        rect.h+=2;
                        rect.x--;
                        rect.y--;
			SDL_DisplayYUVOverlay(overlay,&rect);
		}
	}
	printf("Displayed %d times.\n",i);
}

static void PrintUsage(char *argv0)
{
	fprintf(stderr, "Usage: %s [arg] [arg] [arg] ...\n", argv0);
	fprintf(stderr, "Where 'arg' is one of:\n");
	fprintf(stderr, "	-delay <seconds>\n");
	fprintf(stderr, "	-width <pixels>\n");
	fprintf(stderr, "	-height <pixels>\n");
	fprintf(stderr, "	-bpp <bits>\n");
	fprintf(stderr, "	-format <fmt> (one of the: YV12, IYUV, YUY2, UYVY, YVYU)\n");
	fprintf(stderr, "	-hw\n");
	fprintf(stderr, "	-flip\n");
	fprintf(stderr, "	-scale (test scaling features, from 50%% upto window size)\n");
	fprintf(stderr, "	-mono (use monochromatic RGB2YUV conversion)\n");
	fprintf(stderr, "	-lum <perc> (use luminance correction during RGB2YUV conversion,\n");
	fprintf(stderr, "	             from 0%% to unlimited, normal is 100%%)\n");
	fprintf(stderr, "	-help (shows this help)\n");
	fprintf(stderr, "	-fullscreen (test overlay in fullscreen mode)\n");
}

int main(int argc, char **argv)
{
	char *argv0 = argv[0];
	int flip;
	int delay;
	int desired_bpp;
	Uint32 video_flags, overlay_format;
	char *bmpfile;
#ifdef BENCHMARK_SDL
	Uint32 then, now;
#endif
	int i;

	/* Set default options and check command-line */
	flip = 0;
	scale=0;
        monochrome=0;
        luminance=100;
	delay = 1;
	w = WINDOW_WIDTH;
	h = WINDOW_HEIGHT;
	desired_bpp = 0;
	video_flags = 0;
	overlay_format = SDL_YV12_OVERLAY;

	while ( argc > 1 ) {
		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");
				return(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");
				return(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");
				return(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");
				return(1);
			}
		} else
		if ( strcmp(argv[1], "-lum") == 0 ) {
			if ( argv[2] ) {
				luminance = atoi(argv[2]);
				argv += 2;
				argc -= 2;
			} else {
				fprintf(stderr,
				"The -lum option requires an argument\n");
				return(1);
			}
		} else
		if ( strcmp(argv[1], "-format") == 0 ) {
			if ( argv[2] ) {
				if(!strcmp(argv[2],"YV12"))
					overlay_format = SDL_YV12_OVERLAY;
				else if(!strcmp(argv[2],"IYUV"))
					overlay_format = SDL_IYUV_OVERLAY;
				else if(!strcmp(argv[2],"YUY2"))
					overlay_format = SDL_YUY2_OVERLAY;
				else if(!strcmp(argv[2],"UYVY"))
					overlay_format = SDL_UYVY_OVERLAY;
				else if(!strcmp(argv[2],"YVYU"))
					overlay_format = SDL_YVYU_OVERLAY;
				else
				{
					fprintf(stderr, "The -format option %s is not recognized\n",argv[2]);
					return(1);
				}
				argv += 2;
				argc -= 2;
			} else {
				fprintf(stderr,
				"The -format option requires an argument\n");
				return(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], "-scale") == 0 ) {
			scale = 1;
			argv += 1;
			argc -= 1;
		} else
		if ( strcmp(argv[1], "-mono") == 0 ) {
			monochrome = 1;
			argv += 1;
			argc -= 1;
		} else
		if (( strcmp(argv[1], "-help") == 0 ) || (strcmp(argv[1], "-h") == 0)) {
                        PrintUsage(argv0);
                        return(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());
		return(1);
	}

	/* 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());
		quit(1);
	}
	printf("Set%s %dx%dx%d mode\n",
			screen->flags & SDL_FULLSCREEN ? " fullscreen" : "",
			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 overlay", "testoverlay");

	/* Load picture */
	bmpfile=(argv[1]?argv[1]:"sample.bmp");
	pic = SDL_LoadBMP(bmpfile);
	if ( pic == NULL ) {
		fprintf(stderr, "Couldn't load %s: %s\n", bmpfile,
							SDL_GetError());
		quit(1);
	}

	/* Convert the picture to 32bits, for easy conversion */
	{
		SDL_Surface *newsurf;
		SDL_PixelFormat format;

		format.palette=NULL;
		format.BitsPerPixel=32;
		format.BytesPerPixel=4;
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
		format.Rshift=0;
		format.Gshift=8;
		format.Bshift=16;
#else
		format.Rshift=24;
		format.Gshift=16;
		format.Bshift=8;
#endif
		format.Ashift=0;
		format.Rmask=0xff<<format.Rshift;
		format.Gmask=0xff<<format.Gshift;
		format.Bmask=0xff<<format.Bshift;
		format.Amask=0;
		format.Rloss=0;
		format.Gloss=0;
		format.Bloss=0;
		format.Aloss=8;
		format.colorkey=0;
		format.alpha=0;

		newsurf=SDL_ConvertSurface(pic, &format, SDL_SWSURFACE);
		if(!newsurf)
		{
			fprintf(stderr, "Couldn't convert picture to 32bits RGB: %s\n",
							SDL_GetError());
			quit(1);
		}
		SDL_FreeSurface(pic);
		pic=newsurf;
	}
	
	/* Create the overlay */
	overlay = SDL_CreateYUVOverlay(pic->w, pic->h, overlay_format, screen);
	if ( overlay == NULL ) {
		fprintf(stderr, "Couldn't create overlay: %s\n", SDL_GetError());
		quit(1);
	}
	printf("Created %dx%dx%d %s %s overlay\n",overlay->w,overlay->h,overlay->planes,
			overlay->hw_overlay?"hardware":"software",
			overlay->format==SDL_YV12_OVERLAY?"YV12":
			overlay->format==SDL_IYUV_OVERLAY?"IYUV":
			overlay->format==SDL_YUY2_OVERLAY?"YUY2":
			overlay->format==SDL_UYVY_OVERLAY?"UYVY":
			overlay->format==SDL_YVYU_OVERLAY?"YVYU":
			"Unknown");
	for(i=0; i<overlay->planes; i++)
	{
		printf("  plane %d: pitch=%d\n", i, overlay->pitches[i]);
	}
	
	/* Convert to YUV, and draw to the overlay */
#ifdef BENCHMARK_SDL
	then = SDL_GetTicks();
#endif
	switch(overlay->format)
	{
		case SDL_YV12_OVERLAY:
			ConvertRGBtoYV12(pic,overlay,monochrome,luminance);
			break;
		case SDL_UYVY_OVERLAY:
			ConvertRGBtoUYVY(pic,overlay,monochrome,luminance);
			break;
		case SDL_YVYU_OVERLAY:
			ConvertRGBtoYVYU(pic,overlay,monochrome,luminance);
			break;
		case SDL_YUY2_OVERLAY:
			ConvertRGBtoYUY2(pic,overlay,monochrome,luminance);
			break;
		case SDL_IYUV_OVERLAY:
			ConvertRGBtoIYUV(pic,overlay,monochrome,luminance);
			break;
		default:
			printf("cannot convert RGB picture to obtained YUV format!\n");
			quit(1);
			break;
	}
#ifdef BENCHMARK_SDL
	now = SDL_GetTicks();
	printf("Conversion Time: %d milliseconds\n", now-then);
#endif
	
	/* Do all the drawing work */
#ifdef BENCHMARK_SDL
	then = SDL_GetTicks();
#endif
	Draw();
#ifdef BENCHMARK_SDL
	now = SDL_GetTicks();
	printf("Time: %d milliseconds\n", now-then);
#endif
	SDL_Delay(delay*1000);
	SDL_Quit();
	return(0);
}