#include "SDL/SDL.h"  
#include "SDL/SDL_image.h"  
  
void ShowPic(unsigned char *buf, int size, SDL_Surface *screen, int x, int y)  
{  
    SDL_RWops *src;  
    SDL_Surface *image;  
    SDL_Rect dest;  
  
    src = SDL_RWFromMem(buf, size);  
  
    /* 将BMP文件加载到一个surface*/  
    image = IMG_Load_RW(src, 1);  
    if ( image == NULL )  
    {  
        fprintf(stderr, "无法加载 %s\n", SDL_GetError());  
        return;  
    }  
  
    /* Blit到屏幕surface。onto the screen surface. 
       这时不能锁住surface。 
     */  
    dest.x = x;  
    dest.y = y;  
    dest.w = image->w;  
    dest.h = image->h;  
    SDL_BlitSurface(image, NULL, screen, &dest);  
  
    /* 刷新屏幕的变化部分 */  
    SDL_UpdateRects(screen, 1, &dest);  
}  
  
  
int main(int argc, char *argv[])  
{  
    unsigned char *buf;  
    FILE *fp;  
    int size, i;  
  
    if (argc != 2)  
    {  
        fprintf(stderr, "Usage:%s file_name\n", argv[0]);  
        exit(1);  
  
    }  
  
    if (SDL_Init(SDL_INIT_AUDIO|SDL_INIT_VIDEO) < 0)  
    {  
        fprintf(stderr, "无法初始化SDL: %s\n", SDL_GetError());  
        exit(1);  
    }  
    atexit(SDL_Quit);  
  
    SDL_Surface *screen;  
  
    screen = SDL_SetVideoMode(640, 480, 16, SDL_SWSURFACE);  
    if (screen == NULL)  
    {  
        fprintf(stderr, "无法设置640x480的视频模式：%s\n", SDL_GetError());  
        exit(1);  
    }  
  
    fp = fopen(argv[1], "r");  
    if (fp == NULL)  
    {  
        perror("fopen");  
        exit(1);  
    }  
  
    fseek(fp, 0L, SEEK_END);    
    size = ftell(fp);  
    printf("file size:%d\n", size);  
    rewind(fp);  
  
    buf = malloc(size);  
    if (buf == NULL)  
    {  
        perror("malloc");  
        exit(1);  
    }  
    memset(buf, 0, size);  
  
    i = fread(buf, size, 1, fp);  
    if (i < 0)  
    {  
        perror("fread");  
        exit(1);  
    }  
    fclose(fp);  
  
    printf("read:%d\n", i);  
  
#if 0  
    for (i = 0; i < 100; i++)  
    {  
        if (i % 10 == 0)  
            printf("\n");  
        printf("%02X ", buf[i]);  
    }  
    printf("\n");  
#endif  
    ShowPic(buf, size, screen, 0, 0);  
  
    printf("please enter Enter to exit....");  
    getchar();  
  
    return 0;  
}