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I am a beginner in SDL graphics. I am trying to copy a certain portion of the screen to SDL_Surface. And I tried using this code but it didn't work out
SDL_Surface* original=NULL;
SDL_Rect rct;
rct.x=90;
rct.y=70;
rct.w=100;
rct.h=100;
SDL_BlitSurface(screen,&rct,original,NULL);
//It should blit the area of the screen bounded by rct at 0,0 of the original
apply_surface(500,100,original,screen);
//now it should blit the original at 500,100 of the screen
SDL_Flip(screen);
but nothing was blitted on the screen.
but the same code worked out well when it was written this way
SDL_Surface* original=NULL;
SDL_Rect rct;
rct.x=90;
rct.y=70;
rct.w=100;
rct.h=100;
original=IMG_Load("pics/picture1.png"); //I loaded a picture in the original
SDL_BlitSurface(screen,&rct,original,NULL);
apply_surface(500,100,original,screen);
SDL_Flip(screen);
And it worked out very well. It blitted a small part of my window i.e. screen to 500,100 of the screen
So I think there must be something wrong with my understanding about surface blitting function.
I am using SDL 1.2.14 and Code::Blocks for IDE.
And if there is a better way to do what I am trying to do, then please suggest
Thank you in advance.