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#include <stdlib.h>
#include <stdio.h>
#include <SDL/SDL.h>
void pause();
Uint32 obtenirPixel(SDL_Surface *, int , int );
void definirPixel(SDL_Surface *, int , int , Uint32 );
int main(int argc, char *argv[])
{
SDL_Surface *ecran = NULL, *imageDeFond = NULL,*imagetransf = NULL;
SDL_Rect positionFond;
SDL_Rect positiontransf;
int x,y,h,w;
Uint32 pixel;
positionFond.x = 0;
positionFond.y = 0;
positiontransf.x = 500;
positiontransf.y = 0;
SDL_Init(SDL_INIT_VIDEO);
ecran = SDL_SetVideoMode(1000, 600, 32, SDL_HWSURFACE);
SDL_WM_SetCaption("Chargement d'images en SDL", NULL);
imageDeFond = SDL_LoadBMP("rec1.bmp");
SDL_BlitSurface(imageDeFond, NULL, ecran, &positionFond);
SDL_LockSurface(imageDeFond);
for (y=0;y<imageDeFond->h;y++)
{
for (x=0;x<imageDeFond->w;x++)
{
pixel=obtenirPixel(imageDeFond,x,y);
/*et là le traitement*/
definirPixel(imagetransf,x,y,pixel);
}
}
SDL_UnlockSurface(imageDeFond);
SDL_BlitSurface(imagetransf, NULL, ecran, &positionFond);
SDL_Flip(ecran);
pause();
SDL_FreeSurface(imageDeFond);
SDL_Quit();
return EXIT_SUCCESS;
}
void pause()
{
int continuer = 1;
SDL_Event event;
while (continuer)
{
SDL_WaitEvent(&event);
switch(event.type)
{
case SDL_QUIT:
continuer = 0;
}
}
}
Uint32 obtenirPixel(SDL_Surface *surface, int x, int y)
{
int nbOctetsParPixel = surface->format->BytesPerPixel;
Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * nbOctetsParPixel;
switch(nbOctetsParPixel)
{
case 1:
return *p;
case 2:
return *(Uint16 *)p;
case 3:
if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
return p[0] << 16 | p[1] << 8 | p[2];
else
return p[0] | p[1] << 8 | p[2] << 16;
case 4:
return *(Uint32 *)p;
default:
return 0;
}
}
void definirPixel(SDL_Surface *surface, int x, int y, Uint32 pixel)
{
int nbOctetsParPixel = surface->format->BytesPerPixel;
Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * nbOctetsParPixel;
switch(nbOctetsParPixel)
{
case 1:
*p = pixel;
break;
case 2:
*(Uint16 *)p = pixel;
break;
case 3:
if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
{
p[0] = (pixel >> 16) & 0xff;
p[1] = (pixel >> 8) & 0xff;
p[2] = pixel & 0xff;
}
else
{
p[0] = pixel & 0xff;
p[1] = (pixel >> 8) & 0xff;
p[2] = (pixel >> 16) & 0xff;
}
break;
case 4:
*(Uint32 *)p = pixel;
break;
}
} |
