testoverlay.c
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/* 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);
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#define WINDOW_WIDTH 640
#define WINDOW_HEIGHT 480
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#include "SDL.h"
SDL_Surface *screen, *pic;
SDL_Overlay *overlay;
int scale;
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int monochrome;
int luminance;
int w, h;
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/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void quit(int rc)
{
SDL_Quit();
exit(rc);
}
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/* NOTE: These RGB conversion functions are not intended for speed,
only as examples.
*/
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void RGBtoYUV(Uint8 *rgb, int *yuv, int monochrome, int luminance)
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if (monochrome)
{
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#if 1 /* these are the two formulas that I found on the FourCC site... */
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yuv[0] = 0.299*rgb[0] + 0.587*rgb[1] + 0.114*rgb[2];
yuv[1] = 128;
yuv[2] = 128;
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yuv[0] = (0.257 * rgb[0]) + (0.504 * rgb[1]) + (0.098 * rgb[2]) + 16;
yuv[1] = 128;
yuv[2] = 128;
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}
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;
}
*/
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void ConvertRGBtoYV12(SDL_Surface *s, SDL_Overlay *o, int monochrome, int luminance)
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{
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++)
{
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p=((Uint8 *) s->pixels)+s->pitch*y;
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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++)
{
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RGBtoYUV(p, yuv, monochrome, luminance);
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*(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);
}
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void ConvertRGBtoIYUV(SDL_Surface *s, SDL_Overlay *o, int monochrome, int luminance)
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{
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++)
{
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p=((Uint8 *) s->pixels)+s->pitch*y;
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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++)
{
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RGBtoYUV(p,yuv, monochrome, luminance);
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*(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);
}
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void ConvertRGBtoUYVY(SDL_Surface *s, SDL_Overlay *o, int monochrome, int luminance)
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{
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++)
{
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p=((Uint8 *) s->pixels)+s->pitch*y;
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op=o->pixels[0]+o->pitches[0]*y;
for(x=0; x<s->w && x<o->w; x++)
{
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RGBtoYUV(p, yuv, monochrome, luminance);
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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);
}
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void ConvertRGBtoYVYU(SDL_Surface *s, SDL_Overlay *o, int monochrome, int luminance)
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{
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++)
{
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p=((Uint8 *) s->pixels)+s->pitch*y;
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op=o->pixels[0]+o->pitches[0]*y;
for(x=0; x<s->w && x<o->w; x++)
{
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RGBtoYUV(p,yuv, monochrome, luminance);
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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);
}
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void ConvertRGBtoYUY2(SDL_Surface *s, SDL_Overlay *o, int monochrome, int luminance)
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{
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++)
{
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p=((Uint8 *) s->pixels)+s->pitch*y;
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op=o->pixels[0]+o->pitches[0]*y;
for(x=0; x<s->w && x<o->w; x++)
{
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RGBtoYUV(p,yuv, monochrome, luminance);
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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;
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int disp;
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if(!scale)
{
rect.w=overlay->w;
rect.h=overlay->h;
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for(i=0; i<h-rect.h && i<w-rect.w; i++)
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{
rect.x=i;
rect.y=i;
SDL_DisplayYUVOverlay(overlay,&rect);
}
}
else
{
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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++)
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rect.w+=2;
rect.h+=2;
rect.x--;
rect.y--;
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SDL_DisplayYUVOverlay(overlay,&rect);
}
}
printf("Displayed %d times.\n",i);
}
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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");
}
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int main(int argc, char **argv)
{
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char *argv0 = argv[0];
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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;
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monochrome=0;
luminance=100;
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delay = 1;
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w = WINDOW_WIDTH;
h = WINDOW_HEIGHT;
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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");
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}
} 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");
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}
} 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");
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}
} 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");
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}
} else
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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");
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}
} else
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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]);
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}
argv += 2;
argc -= 2;
} else {
fprintf(stderr,
"The -format option requires an argument\n");
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}
} 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
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if ( strcmp(argv[1], "-mono") == 0 ) {
monochrome = 1;
argv += 1;
argc -= 1;
} else
if (( strcmp(argv[1], "-help") == 0 ) || (strcmp(argv[1], "-h") == 0)) {
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PrintUsage(argv0);
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} else
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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());
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}
/* 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());
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}
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());
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}
/* 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());
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}
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());
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}
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:
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ConvertRGBtoYV12(pic,overlay,monochrome,luminance);
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break;
case SDL_UYVY_OVERLAY:
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ConvertRGBtoUYVY(pic,overlay,monochrome,luminance);
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break;
case SDL_YVYU_OVERLAY:
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ConvertRGBtoYVYU(pic,overlay,monochrome,luminance);
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break;
case SDL_YUY2_OVERLAY:
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ConvertRGBtoYUY2(pic,overlay,monochrome,luminance);
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break;
case SDL_IYUV_OVERLAY:
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ConvertRGBtoIYUV(pic,overlay,monochrome,luminance);
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break;
default:
printf("cannot convert RGB picture to obtained YUV format!\n");
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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);
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return(0);
}