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SDL_RenderCopy: no scaling unless bigger destination

--- a/libnpe_sdl2/sdl2.c

+++ b/libnpe_sdl2/sdl2.c

@@ -825,7 +825,7 @@

 		backcopy = malloc(logiw*logih*4);

 	}

-	if(dre == nil && (Dx(sr) != logiw || Dy(sr) != logih))

+	if(Dx(dr)/Dx(sr) > 1 || Dy(dr)/Dy(sr) > 1)

 		npe_sdl_scale((u32int*)byteaddr(t->m, ZP), Dx(sr), Dy(sr), (u32int*)byteaddr(back, ZP), logiw, logih);

 	else

 		memimagedraw(back, dr, t->m, sr.min, nil, ZP, duff(t->blend));