Fixed bug #15 SDL_blit_A.mmx-speed.patch.txt -- Speed improvements and a bugfix for the current GCC inline mmx asm code: - Changed some ops and removed some resulting useless ones. - Added some instruction parallelism (some gain) The resulting speed on my Xeon improved upto 35% depending on the function (measured in fps). - Fixed a bug where BlitRGBtoRGBSurfaceAlphaMMX() was setting the alpha component on the destination surfaces (to opaque-alpha) even when the surface had none. SDL_blit_A.mmx-msvc.patch.txt -- MSVC mmx intrinsics version of the same GCC asm code. MSVC compiler tries to parallelize the code and to avoid register stalls, but does not always do a very good job. Per-surface blending MSVC functions run quite a bit faster than their pure-asm counterparts (upto 55% faster for 16bit ones), but the per-pixel blending runs somewhat slower than asm. - BlitRGBtoRGBSurfaceAlphaMMX and BlitRGBtoRGBPixelAlphaMMX (and all variants) can now also handle formats other than (A)RGB8888. Formats like RGBA8888 and some quite exotic ones are allowed -- like RAGB8888, or actually anything having channels aligned on 8bit boundary and full 8bit alpha (for per-pixel alpha blending). The performance cost of this change is virtually 0 for per-surface alpha blending (no extra ops inside the loop) and a single non-MMX op inside the loop for per-pixel blending. In testing, the per-pixel alpha blending takes a ~2% performance hit, but it still runs much faster than the current code in CVS. If necessary, a separate function with this functionality can be made. This code requires Processor Pack for VC6.

/*
 * Copyright 1993-2001 by Xi Graphics, Inc.
 * All Rights Reserved.
 *
 * Please see the LICENSE file accompanying this distribution for licensing 
 * information. 
 *
 * Please send any bug fixes and modifications to src@xig.com.
 *
 * $XiGId: xme.h,v 1.1.1.1 2001/11/19 19:01:10 jon Exp $
 *
 */


#ifndef _XME_H_INCLUDED 
#define _XME_H_INCLUDED

typedef struct {        
  short		        x;
  short		        y;
  unsigned short	w;
  unsigned short	h;
} XiGMiscViewInfo;

typedef struct {        
  unsigned short        width;
  unsigned short        height;
  int                   refresh;
} XiGMiscResolutionInfo;

extern Bool XiGMiscQueryVersion(Display *dpy, int *major, int *minor);
extern int XiGMiscQueryViews(Display *dpy, int screen, 
			     XiGMiscViewInfo **pviews);
extern int XiGMiscQueryResolutions(Display *dpy, int screen, int view, 
			    int *pactive, 
			    XiGMiscResolutionInfo **presolutions);
extern void XiGMiscChangeResolution(Display *dpy, int screen, int view, 
			     int width, int height, int refresh);
#endif /* _XME_H_INCLUDED */