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SDL游戲編程(3)使用SDL擴展類庫顯示PNG圖片和字體

SDL本身只支持加載BMP文件，如果你想顯示其他類型的圖像文件，就要用到擴展類庫，擴展類庫里面還有其他一些組件，你可以在這里下載到 http://www.libsdl.org/projects/SDL_image/
下載完以后，按照教程一配置，我們就可以顯示一張PNG圖片了。

以下是具體的代碼，與教程二很相似，如有疑問請參考教程二。

#include? " SDL.h "

#include? < SDL_image.h >

#include? < string >

SDL_Surface? * screen;

SDL_Surface? * background;

SDL_Surface? * load_image(?std:: string ?filename?)?

{

???? // The?image?that's?loaded

????SDL_Surface * ?loadedImage? = ?NULL;

???? // The?optimized?image?that?will?be?used

????SDL_Surface * ?optimizedImage? = ?NULL;

???? // Load?the?image?using?SDL_image

????loadedImage? = ?IMG_Load(?filename.c_str()?);

???? // If?the?image?loaded

???? if (?loadedImage? != ?NULL?)

???? {

???????? // Create?an?optimized?image

????????optimizedImage? = ?SDL_DisplayFormat(?loadedImage?);

???????? // Free?the?old?image

????????SDL_FreeSurface(?loadedImage?);

????}

???? // Return?the?optimized?image

???? return ?optimizedImage;

}

void ?apply_surface( int ?x, int ?y,SDL_Surface? * source?,SDL_Surface? * destinaion)

{

????SDL_Rect?rect;

????rect.x = x;

????rect.y = y;

????SDL_BlitSurface(source,NULL,destinaion, & rect);

}

int ?main(? int ?argc,? char * ?args[]?)

{

???? // Start?SDL

????SDL_Init(?SDL_INIT_EVERYTHING?);

???? // Quit?SDL

????screen = SDL_SetVideoMode( 640 , 480 , 32 ,SDL_SWSURFACE);

????background = load_image( " Dockxrt5.jpg " );

????apply_surface( 0 , 0 ,background,screen);

???? if (SDL_Flip(screen) ==- 1 )

???????? return ? - 1 ;

????SDL_FreeSurface(background);

????SDL_Delay( 2000 );

????SDL_FreeSurface(background);

????SDL_Quit();

???? return ? 0 ;????

}

以下代碼用SDL_TTF擴展類庫加載一個TTF字體文件，并用該字體顯示一段文字。

#include? " SDL.h "
?2

#include? < SDL_ttf.h >
?3

#include? < string >
?4

SDL_Surface? * screen;
?5

SDL_Surface? * background;
?6

void ?apply_surface( int ?x, int ?y,SDL_Surface? * source?,SDL_Surface? * destinaion)
?7

{
?8

????SDL_Rect?rect;
?9

????rect.x = x;
10

????rect.y = y;
11

????SDL_BlitSurface(source,NULL,destinaion, & rect);
12

}
14

int ?main(? int ?argc,? char * ?args[]?)
15

{
16

???? // Start?SDL
17

????SDL_Init(?SDL_INIT_EVERYTHING?);
19

???? if (TTF_Init() ==- 1 )
20

???????? return ? - 1 ;
21

????TTF_Font? * font = NULL;
22

????font = TTF_OpenFont( " verdana.ttf " , 14 );
23

???? if (font? == ?NULL)
24

???????? return ? - 1 ;
25

???? // Quit?SDL
27

????SDL_Color?textColor = { 255 , 255 , 255 } ;
28

????SDL_Color?textBgColor = { 0 , 0 , 0 ,} ;
29

????screen = SDL_SetVideoMode( 640 , 480 , 32 ,SDL_SWSURFACE);
30

????background = TTF_RenderText_Blended(?font,? " why?it?can?not?display?chinese " ,?textColor);
31

????apply_surface( 0 , 0 ,background,screen);
33

???? if (SDL_Flip(screen) ==- 1 )
35

???????? return ? - 1 ;
36

????SDL_Delay( 100000 );
38

????SDL_Quit();
39

???? return ? 0 ;????
41

}
42

posted on 2007-03-05 22:30 大熊貓閱讀(3454) 評論(4) 編輯收藏引用

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# re: SDL游戲編程(3)使用SDL擴展類庫顯示PNG圖片和字體 2007-05-06 21:54 bloodbao

請問在DEV_CPP或CODEBLOCKS下如何編譯SDL_IMAGE,
有沒有SDL_IMAGE.A 回復更多評論

# re: SDL游戲編程(3)使用SDL擴展類庫顯示PNG圖片和字體 2007-05-10 21:38 wqm

SDL_ttf.h在哪里可以找到? 回復更多評論

# re: SDL游戲編程(3)使用SDL擴展類庫顯示PNG圖片和字體 2007-05-21 11:06 阿丁

SDL_ttf.h在哪里可以找到?
能否發(fā)一份完整的SDL的包文件給我,
jacknes111@163.com
先謝謝哦回復更多評論

# re: SDL游戲編程(3)使用SDL擴展類庫顯示PNG圖片和字體 2008-11-18 10:29 dniit

@阿丁

到我的CSDN下載
http://dniit.download.csdn.net 回復更多評論

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