Image resampling for thumbnails

includes/graphics.h

@@ -52,6 +52,8 @@ void *ptif_pack(pixel *src, int w, int h, int *result_size);
 
 pixel *ptif_unpack(void *datain, int size, int *w, int *h);
 
+pixel *resample_img(pixel *src, int sw, int sh, int rw, int rh);
+
 pixel *rescale_img(pixel *src, int sw, int sh, int *qw, int *qh, int f);
 
 void sdl_blit_1(int x, int y, int w, int h, pixel *src, int pitch);

src/graphics.c

@@ -138,6 +138,23 @@ pixel *ptif_unpack(void *datain, int size, int *w, int *h){
 	return result;
 }
 
+pixel *resample_img(pixel *src, int sw, int sh, int rw, int rh)
+{
+	int y, x;
+	//int i,j,x,y,w,h,r,g,b,c;
+	pixel *q;
+	q = malloc(rw*rh*PIXELSIZE);
+	//TODO: Actual resampling, this is just cheap nearest pixel crap
+	for (y=0; y<rh; y++)
+		for (x=0; x<rw; x++)
+		{
+			q[rw*y+x] = src[sw*(y*sh/rh)+(x*sw/rw)];
+		}
+	//*qw = w;
+	//*qh = h;
+	return q;
+}
+
 pixel *rescale_img(pixel *src, int sw, int sh, int *qw, int *qh, int f)
 {
 	int i,j,x,y,w,h,r,g,b,c;

src/interface.c

@@ -2493,10 +2493,13 @@ int search_ui(pixel *vid_buf)
 				{
 					//render_thumb(search_thumbs[pos], search_thsizes[pos], 1, v_buf, gx, gy, GRID_S);
 					int finh, finw;
-					char *thumb_imgdata = ptif_unpack(search_thumbs[pos], search_thsizes[pos], &finw, &finh);
+					pixel *thumb_rsdata = NULL;
+					pixel *thumb_imgdata = ptif_unpack(search_thumbs[pos], search_thsizes[pos], &finw, &finh);
 					if(thumb_imgdata!=NULL){
-						draw_image(v_buf, thumb_imgdata, gx, gy, finw, finh, 255);					
+						thumb_rsdata = resample_img(thumb_imgdata, finw, finh, XRES/GRID_S, YRES/GRID_S);
+						draw_image(v_buf, thumb_rsdata, gx, gy, XRES/GRID_S, YRES/GRID_S, 255);					
 						free(thumb_imgdata);
+						free(thumb_rsdata);
 					}
 					thumb_drawn[pos] = 1;
 				}