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Draw.cpp fix and optimisations

For whatever reason, alpha blending is enabled by default on surfaces.
Disabling it should result in faster blits, and also follow DirectDraw's
behaviour more closely.

--- a/src/Draw.cpp

+++ b/src/Draw.cpp

@@ -155,6 +155,7 @@

 		{

 			//Create surface

 			surf[surf_no].surface = SDL_CreateRGBSurfaceWithFormat(0, bxsize * magnification, bysize * magnification, 0, SDL_PIXELFORMAT_RGBA32);

+			SDL_SetSurfaceBlendMode(surf[surf_no].surface, SDL_BLENDMODE_NONE);

 			if (surf[surf_no].surface == NULL)

 			{

@@ -224,7 +225,7 @@

 		}

 		else

 		{

-			SDL_Surface *surface = SDL_LoadBMP_RW(fp, 1);

+			SDL_Surface *surface = SDL_LoadBMP_RW(fp, 0);

 			if (surface == NULL)

 			{

@@ -238,7 +239,6 @@

 					{

 						SDL_Rect dst_rect = {0, 0, surface->w, surface->h};

 						SDL_BlitSurface(surface, NULL, surf[surf_no].surface, &dst_rect);

-						SDL_FreeSurface(surface);

 						surf[surf_no].needs_updating = true;

 						printf(" ^ Successfully loaded\n");

 						success = true;

@@ -287,6 +287,8 @@

 		}

 	}

+	fp->close(fp);

+

 	return success;

 }

@@ -379,6 +381,7 @@

 	//Get texture of what's currently rendered on screen

 	SDL_Surface *surface = SDL_CreateRGBSurfaceWithFormat(0, w, h, 0, SDL_PIXELFORMAT_RGBA32);

+	SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_NONE);

 	SDL_RenderReadPixels(gRenderer, NULL, SDL_PIXELFORMAT_RGBA32, surface->pixels, surface->pitch);

 	//Get rects

-- 

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