SDL库无法生成ARGB1555的图片是怎么回事？

参考了本论坛关于海思OSD的方法 http://bbs.ebaina.com/forum.php?mod=viewthread&tid=10879&extra=&page=2

http://bbs.ebaina.com/forum.php?mod=viewthread&tid=11772&highlight=SDL

写了代码测试将时间字符串转为ARGB1555；

[code]#include

include "SDL.h"

include "SDL_ttf.h"

include

int main(int argc, const char argv[]) { char pstr[18]; SDL_PixelFormat fmt; TTF_Font font; SDL_Surface text, *temp; time_t time_seconds = time(NULL); struct tm now_time; localtime_r(&time_seconds, &now_time); sprintf(pstr,"%04d-%02d-%02d %02d:%02d:%02d", now_time.tm_year + 1900, now_time.tm_mon + 1, now_time.tm_mday, now_time.tm_hour, now_time.tm_min, now_time.tm_sec); if (TTF_Init() < 0 ) { fprintf(stderr, "Couldn't initialize TTF: %s\n", SDL_GetError()); SDL_Quit(); }

font = TTF_OpenFont("./simhei.ttf", 48);
if ( font == NULL )
{
    fprintf(stderr, "Couldn't load %d pt font from %s: %s\n", 18, "ptsize", SDL_GetError());
} 
  SDL_Color forecol= { 0xff, 0xff, 0xff, 0 };
  text = TTF_RenderUTF8_Solid(font, pstr, forecol);
  temp = SDL_CreateRGBSurface(SDL_SWSURFACE,text->w, text->h, 16 ,0x00000000, 0x00000000, 0x00000000,0x00000000);
  SDL_Rect bounds;
    if (temp != NULL)
    {
            bounds.x = 0;
            bounds.y = 0;
            bounds.w = text->w;
            bounds.h = text->h;
            if (SDL_LowerBlit(text, &bounds, temp, &bounds) < 0)
            {
                    SDL_FreeSurface(text);
                    SDL_SetError("Couldn't convert image to 16 bpp");
                    text = NULL;
                    return -1;
            }
    }
    else
    {
            printf("sdl  failed\n");
            return -1;
    }

SDL_SaveBMP(temp, "save.bmp");
SDL_FreeSurface(text);
SDL_FreeSurface(temp);
TTF_CloseFont(font);
TTF_Quit();

return 0;

} [/code]

以上代码依然只能生成24位的图像，不知道是否参数设置有问题？