/** Perform a stretch blit between two surfaces of the same format. * NOTE: This function is not safe to call from multiple threads! * * This function will stretch a srcrect smoothly to the full area of * the dst surface. If no srcrect is given then the full area of the * src surface is stretched smoothly to the full dst surface. The * dstrect is ignored always. * * This function will also watch for a clip rectangle on the src * surface. This may speed up handling in your programs by creating * a larger src surface with an associated viewframe, and the srcrect * argument needs not be recomputed. */extern int SDL_StretchSurfaceRect(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect);/** Perform a stretch blit between two surfaces of the same format. * NOTE: This function is not safe to call from multiple threads! * * This function will stretch a srcrect smoothly to the full area of * the dst surface. If no srcrect is given then the full area of the * src surface is stretched smoothly to the full dst surface. The * dstrect is ignored always. * * Remember that this is the inverse meaning, the main SDL lib will * ignore the srcrect and only watch for the dstrect if any. */extern int SDL_StretchSurfaceBlit(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect);/** * This function will stretch to 150%. This is not only a fast function * but it is also safe to call from multiple threads. If the srcrect * is given then only that rect is copied. Otherwise the full src * surface is copied to the full dst surface. The dstrect is ignored. */extern int SDL_StretchSurface_23(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect);
[isbear:~] cat i.c#include <stdio.h>#include <stdlib.h>#include <SDL/SDL.h>#include <SDL/SDL_image.h>#include <SDL_stretch/SDL_stretch.h>/* first arg - n, r, b or 2 - method of stretching, * sechond arg - image to show. * should stretch center of image x2 * ( with method '2' - x1.5) */int main ( int argc, char **argv ){ SDL_Surface *s; SDL_Surface *i; SDL_Surface *i1; SDL_Rect sr; SDL_Rect ir; SDL_Rect i1r; SDL_Init ( SDL_INIT_VIDEO ); s = SDL_SetVideoMode ( 1024, 768, 16, SDL_FULLSCREEN|SDL_ANYFORMAT ); sr.x = 0; sr.y = 0; sr.w = s->w; sr.h = s->h; fprintf ( stderr, "Screen: %d, %d, %d, %d\n", sr.x, sr.y, sr.w, sr.h ); i = IMG_Load ( argv[2] ); ir.x = 0; ir.y = 0; ir.w = i->w; ir.h = i->h; fprintf ( stderr, "Image: %d, %d, %d, %d\n", ir.x, ir.y, ir.w, ir.h ); /* Easy way to get surface with the same format as i :) */ i1 = IMG_Load ( argv[2] ); i1r.x = i1->w / 4; i1r.y = i1->h / 4; i1r.w = i1->w / 2; i1r.h = i1->h / 2; fprintf ( stderr, "Stretch area: %d, %d, %d, %d\n", i1r.x, i1r.y, i1r.w, i1r.h ); switch ( *argv[1] ) { case 'n': break; case 'r': SDL_StretchSurfaceRect ( i1, &i1r, i, &ir ); break; case 'b': SDL_StretchSurfaceBlit ( i1, &i1r, i, &ir ); break; case '2': SDL_StretchSurface_23 ( i1, &i1r, i, &ir ); break; } fprintf ( stderr, "Stretced image: %d, %d\n", i->w, i->h ); SDL_BlitSurface ( i, &ir, s, &sr ); SDL_UpdateRect ( s, sr.x, sr.y, sr.w, sr.h ); sleep ( 6 ); SDL_Quit ();}/* The End. */[isbear:~] gcc -I/usr/include/SDL -lSDL -lSDL_image -lSDL_stretch i.c[isbear:~] ./a.out r picts/24-05-08_1136.jpg Screen: 0, 0, 1024, 768Image: 0, 0, 1200, 1600Stretch area: 300, 400, 600, 800Stretced image: 1200, 1600[isbear:~] ./a.out b picts/24-05-08_1136.jpg Screen: 0, 0, 1024, 768Image: 0, 0, 1200, 1600Stretch area: 300, 400, 600, 800Stretced image: 1200, 1600[isbear:~] ./a.out 2 picts/24-05-08_1136.jpg Screen: 0, 0, 1024, 768Image: 0, 0, 1200, 1600Stretch area: 300, 400, 600, 800Stretced image: 1200, 1600[isbear:~] ./a.out n picts/24-05-08_1136.jpg Screen: 0, 0, 1024, 768Image: 0, 0, 1200, 1600Stretch area: 300, 400, 600, 800Stretced image: 1200, 1600[isbear:~]
