嵌入式 hi3518cSDL_tff库做bmp实现osd

配置freetype:

xy@xy-pc:~/aaa/freetype-2.4.10$CC=arm-hisiv200-linux-gcc ./configure --prefix=/home/xy/aaa/bin--host=arm-linux

编译安装：make ,makeinstall。

配置SDL:

xy@xy-pc:~/aaa/SDL-1.2.15$CC=arm-hisiv200-linux-gcc CXX=arm-hisiv200-linux-cpp ./configure--prefix=/home/xy/aaa/bin --host=arm-linux --disable-alsa--disable-pulseaudio

编译安装。

make

make install

配置SDL_tff:

xy@xy-pc:~/aaa/SDL_ttf-2.0.11$CC=arm-hisiv200-linux-gcc./configure --with-freetype-prefix=/home/xy/aaa/bin--host=arm-linux

编译安装.

[cpp] viewplaincopyprint?

2. #include
3. #include
4. #include "SDL/SDL.h"
5. #include"SDL/SDL_ttf.h"
6. int main(int argc,char**argv)
7. {
8. TTF_Font *font;
9. SDL_Surface *text, *temp;
11. if ( TTF_Init() < 0 ){
12. fprintf(stderr, "Couldn't initialize TTF:%s\n",SDL_GetError());
13. SDL_Quit();
14. return(2);
15. }
16. font = TTF_OpenFont("cu.ttf", 48);
17. if ( font == NULL ){
18. fprintf(stderr, "Couldn't load %d pt font from %s:%s\n",
19. "ptsize", 18,SDL_GetError());
20. }
21. //TTF_SetFontStyle(font, 0);
22. // TTF_SetFontOutline(font, 0);
23. //TTF_SetFontKerning(font, 1);
24. // TTF_SetFontHinting(font, 0);
25. //SDL_Color forecol= { 0xFF, 0xFF, 0xFF, 0};
26. SDL_Color forecol= { 0x00, 0x00, 0x00, 0 };
27. char*string="你好啊";
28. text = TTF_RenderUTF8_Solid(font, string,forecol);
29. //SDL_LoadBMP
30. SDL_SaveBMP(text, "1.bmp");
31. SDL_FreeSurface(text);
32. TTF_CloseFont(font);
33. TTF_Quit();
34. }

#include #include #include "SDL/SDL.h"#include "SDL/SDL_ttf.h"int main(int argc,char **argv){        TTF_Font *font;        SDL_Surface *text, *temp;                  if ( TTF_Init() < 0 ) {                 fprintf(stderr, "Couldn't initialize TTF: %s\n",SDL_GetError());                 SDL_Quit();                 return(2);         }        font = TTF_OpenFont("cu.ttf", 48);        if ( font == NULL ) {                fprintf(stderr, "Couldn't load %d pt font from %s: %s\n",                                        "ptsize", 18, SDL_GetError());        }//      TTF_SetFontStyle(font, 0);//      TTF_SetFontOutline(font, 0);//      TTF_SetFontKerning(font, 1);//      TTF_SetFontHinting(font, 0);        //SDL_Color forecol=     { 0xFF, 0xFF, 0xFF, 0 };        SDL_Color forecol=       { 0x00, 0x00, 0x00, 0 };        char *string="你好啊";        text = TTF_RenderUTF8_Solid(font, string, forecol);        //SDL_LoadBMP        SDL_SaveBMP(text, "1.bmp");        SDL_FreeSurface(text);        TTF_CloseFont(font);        TTF_Quit();}

就可以保存成1.bmp了。输入了汉字。代码保存的文本格式应该utf-8.

对于海思3520a用的是rgb1555格式，所以应该转成那种格式：

[cpp] viewplaincopyprint?

2. SDL_Surface *temp =SDL_CreateRGBSurface(SDL_SWSURFACE,
3. text->w, text->h, 16,\
4. 0x00FF0000, 0x0000FF00, 0x000000FF,
5. 0);
6. SDL_Rect bounds;
7. if (temp !=NULL)
8. {
9. bounds.x = 0;
10. bounds.y = 0;
11. bounds.w = text->w;
12. bounds.h = text->h;
13. if (SDL_LowerBlit(text,&bounds, temp, &bounds) < 0) {
14. SDL_FreeSurface(text);
15. SDL_SetError("Couldn't convert image to 16bpp");
16. text = NULL;
17. }
18. }
19. stBitmap.u32Width = temp->w;
20. stBitmap.u32Height = temp->h;
21. stBitmap.pData= temp->pixels;
22. stBitmap.enPixelFormat= PIXEL_FORMAT_RGB_1555;
23. SDL_FreeSurface(text);
24. SDL_FreeSurface(temp);

               SDL_Surface *temp = SDL_CreateRGBSurface(SDL_SWSURFACE,                        text->w, text->h, 16,\                                                0x00FF0000, 0x0000FF00, 0x000000FF,                                                0);        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;                }        }        stBitmap.u32Width = temp->w;        stBitmap.u32Height = temp->h;        stBitmap.pData= temp->pixels;        stBitmap.enPixelFormat= PIXEL_FORMAT_RGB_1555 ;        SDL_FreeSurface(text);        SDL_FreeSurface(temp);

添加以上代码，基本就可以达到了。