view src/video/SDL_blit.c @ 1192:54aa9aa32327

To: sdl@libsdl.org From: Christian Walther <cwalther@gmx.ch> Date: Fri, 18 Nov 2005 23:39:02 +0100 Subject: [SDL] Mouse position bugs on Mac OS X The attached patch fixes a few bugs in SDL related to the mouse position in windowed mode on Mac OS X, reproduced using the attached minimal test program - at least here on 10.3.9, with SDL CVS from today. Could anyone test whether the bugs exist and are fixed by the patch on 10.2 and 10.4? 1. When using OpenGL, the vertical mouse positions obtained through events or SDL_GetMouseState() are off by one. 2. When using OpenGL, SDL_WarpMouse() inverts the y coordinate. 3. Clicks on the topmost pixel row of the window are not recognized. 1 and 2 do not occur in non-OpenGL mode, while 3 does. All three only occur in windowed mode, not in fullscreen. The cause for 1 and 3 is that in Cocoa, "the location of the mouse" seems to be defined as "the location of the top left corner of the mouse pointer's hot pixel" (this is not documented, it's just what I found out here), which together with the fact that Cocoa's usual y coordinates start at the bottom and increase upwards means that the y coordinate of the mouse runs from 1 to h, not from 0 to h-1, in a window of height h. If it does work on 10.2 and 10.4 (I'll try to test it as soon as I can, but at the moment all I have at hand is 10.3.9), can this be applied to the CVS? -Christian To: sdl@libsdl.org From: Christian Walther <cwalther@gmx.ch> Date: Mon, 28 Nov 2005 10:41:51 +0100 Subject: [SDL] Re: Mouse position bugs on Mac OS X I wrote: > I'll try to test it as soon as I can, but at the moment all I have at hand is 10.3.9 So, here are the results of my tests (with patched and unpatched frameworks compiled with Xcode 1.5 (gcc 3.3) on 10.3.9): On 10.1.5, my test program doesn't run because of "Undefined symbols: SDL undefined reference to _CGMainDisplayID expected to be defined in Carbon". I guess not supporting 10.1 was a deliberate decision then and that's OK with me. On 10.2.8, 10.3.9, and 10.4.0, the bugs exist as described in my original post and are fixed by my patch. That is, there is no difference between pre/post 10.3 and the patched version works correctly in all combinations of GL/non-GL and windowed/fullscreen. I therefore recommend the patch for inclusion. -Christian
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 28 Nov 2005 13:58:26 +0000
parents 68f607298ca9
children b81f54c3963f
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "SDL_error.h"
#include "SDL_video.h"
#include "SDL_sysvideo.h"
#include "SDL_blit.h"
#include "SDL_RLEaccel_c.h"
#include "SDL_pixels_c.h"
#include "SDL_memops.h"

#if (defined(i386) || defined(__x86_64__)) && defined(__GNUC__) && defined(USE_ASMBLIT)
#define MMX_ASMBLIT
#endif

#if defined(MMX_ASMBLIT)
#include "SDL_cpuinfo.h"
#include "mmx.h"
#endif

/* The general purpose software blit routine */
static int SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect,
			SDL_Surface *dst, SDL_Rect *dstrect)
{
	int okay;
	int src_locked;
	int dst_locked;

	/* Everything is okay at the beginning...  */
	okay = 1;

	/* Lock the destination if it's in hardware */
	dst_locked = 0;
	if ( SDL_MUSTLOCK(dst) ) {
		if ( SDL_LockSurface(dst) < 0 ) {
			okay = 0;
		} else {
			dst_locked = 1;
		}
	}
	/* Lock the source if it's in hardware */
	src_locked = 0;
	if ( SDL_MUSTLOCK(src) ) {
		if ( SDL_LockSurface(src) < 0 ) {
			okay = 0;
		} else {
			src_locked = 1;
		}
	}

	/* Set up source and destination buffer pointers, and BLIT! */
	if ( okay  && srcrect->w && srcrect->h ) {
		SDL_BlitInfo info;
		SDL_loblit RunBlit;

		/* Set up the blit information */
		info.s_pixels = (Uint8 *)src->pixels +
				(Uint16)srcrect->y*src->pitch +
				(Uint16)srcrect->x*src->format->BytesPerPixel;
		info.s_width = srcrect->w;
		info.s_height = srcrect->h;
		info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel;
		info.d_pixels = (Uint8 *)dst->pixels +
				(Uint16)dstrect->y*dst->pitch +
				(Uint16)dstrect->x*dst->format->BytesPerPixel;
		info.d_width = dstrect->w;
		info.d_height = dstrect->h;
		info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel;
		info.aux_data = src->map->sw_data->aux_data;
		info.src = src->format;
		info.table = src->map->table;
		info.dst = dst->format;
		RunBlit = src->map->sw_data->blit;

		/* Run the actual software blit */
		RunBlit(&info);
	}

	/* We need to unlock the surfaces if they're locked */
	if ( dst_locked ) {
		SDL_UnlockSurface(dst);
	}
	if ( src_locked ) {
		SDL_UnlockSurface(src);
	}
	/* Blit is done! */
	return(okay ? 0 : -1);
}

#ifdef MMX_ASMBLIT
static __inline__ void SDL_memcpyMMX(char* to,char* from,int len)
{
	int i;

	for(i=0; i<len/8; i++) {
		__asm__ __volatile__ (
		"	movq (%0), %%mm0\n"
		"	movq %%mm0, (%1)\n"
		: : "r" (from), "r" (to) : "memory");
		from+=8;
		to+=8;
	}
	if (len&7)
		SDL_memcpy(to, from, len&7);
}

static __inline__ void SDL_memcpySSE(char* to,char* from,int len)
{
	int i;

	__asm__ __volatile__ (
	"	prefetchnta (%0)\n"
	"	prefetchnta 64(%0)\n"
	"	prefetchnta 128(%0)\n"
	"	prefetchnta 192(%0)\n"
	: : "r" (from) );

	for(i=0; i<len/8; i++) {
		__asm__ __volatile__ (
		"	prefetchnta 256(%0)\n"
		"	movq (%0), %%mm0\n"
		"	movntq %%mm0, (%1)\n"
		: : "r" (from), "r" (to) : "memory");
		from+=8;
		to+=8;
	}
	if (len&7)
		SDL_memcpy(to, from, len&7);
}
#endif

static void SDL_BlitCopy(SDL_BlitInfo *info)
{
	Uint8 *src, *dst;
	int w, h;
	int srcskip, dstskip;

	w = info->d_width*info->dst->BytesPerPixel;
	h = info->d_height;
	src = info->s_pixels;
	dst = info->d_pixels;
	srcskip = w+info->s_skip;
	dstskip = w+info->d_skip;
#ifdef MMX_ASMBLIT
	if(SDL_HasSSE())
	{
		while ( h-- ) {
			SDL_memcpySSE(dst, src, w);
			src += srcskip;
			dst += dstskip;
		}
		__asm__ __volatile__ (
		"	emms\n"
		::);
	}
	else
	if(SDL_HasMMX())
	{
		while ( h-- ) {
			SDL_memcpyMMX(dst, src, w);
			src += srcskip;
			dst += dstskip;
		}
		__asm__ __volatile__ (
		"	emms\n"
		::);
	}
	else
#endif
	while ( h-- ) {
		SDL_memcpy(dst, src, w);
		src += srcskip;
		dst += dstskip;
	}
}

static void SDL_BlitCopyOverlap(SDL_BlitInfo *info)
{
	Uint8 *src, *dst;
	int w, h;
	int srcskip, dstskip;

	w = info->d_width*info->dst->BytesPerPixel;
	h = info->d_height;
	src = info->s_pixels;
	dst = info->d_pixels;
	srcskip = w+info->s_skip;
	dstskip = w+info->d_skip;
	if ( dst < src ) {
		while ( h-- ) {
			SDL_memcpy(dst, src, w);
			src += srcskip;
			dst += dstskip;
		}
	} else {
		src += ((h-1) * srcskip);
		dst += ((h-1) * dstskip);
		while ( h-- ) {
			SDL_revcpy(dst, src, w);
			src -= srcskip;
			dst -= dstskip;
		}
	}
}

/* Figure out which of many blit routines to set up on a surface */
int SDL_CalculateBlit(SDL_Surface *surface)
{
	int blit_index;

	/* Clean everything out to start */
	if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
		SDL_UnRLESurface(surface, 1);
	}
	surface->map->sw_blit = NULL;

	/* Figure out if an accelerated hardware blit is possible */
	surface->flags &= ~SDL_HWACCEL;
	if ( surface->map->identity ) {
		int hw_blit_ok;

		if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
			/* We only support accelerated blitting to hardware */
			if ( surface->map->dst->flags & SDL_HWSURFACE ) {
				hw_blit_ok = current_video->info.blit_hw;
			} else {
				hw_blit_ok = 0;
			}
			if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
				hw_blit_ok = current_video->info.blit_hw_CC;
			}
			if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
				hw_blit_ok = current_video->info.blit_hw_A;
			}
		} else {
			/* We only support accelerated blitting to hardware */
			if ( surface->map->dst->flags & SDL_HWSURFACE ) {
				hw_blit_ok = current_video->info.blit_sw;
			} else {
				hw_blit_ok = 0;
			}
			if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
				hw_blit_ok = current_video->info.blit_sw_CC;
			}
			if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
				hw_blit_ok = current_video->info.blit_sw_A;
			}
		}
		if ( hw_blit_ok ) {
			SDL_VideoDevice *video = current_video;
			SDL_VideoDevice *this  = current_video;
			video->CheckHWBlit(this, surface, surface->map->dst);
		}
	}
	
	/* if an alpha pixel format is specified, we can accelerate alpha blits */
	if (((surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE )&&(current_video->displayformatalphapixel)) 
	{
		if ( (surface->flags & SDL_SRCALPHA) ) 
			if ( current_video->info.blit_hw_A ) {
				SDL_VideoDevice *video = current_video;
				SDL_VideoDevice *this  = current_video;
				video->CheckHWBlit(this, surface, surface->map->dst);
			}
	}

	/* Get the blit function index, based on surface mode */
	/* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */
	blit_index = 0;
	blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY))      << 0;
	if ( surface->flags & SDL_SRCALPHA
	     && (surface->format->alpha != SDL_ALPHA_OPAQUE
		 || surface->format->Amask) ) {
	        blit_index |= 2;
	}

	/* Check for special "identity" case -- copy blit */
	if ( surface->map->identity && blit_index == 0 ) {
	        surface->map->sw_data->blit = SDL_BlitCopy;

		/* Handle overlapping blits on the same surface */
		if ( surface == surface->map->dst ) {
		        surface->map->sw_data->blit = SDL_BlitCopyOverlap;
		}
	} else {
		if ( surface->format->BitsPerPixel < 8 ) {
			surface->map->sw_data->blit =
			    SDL_CalculateBlit0(surface, blit_index);
		} else {
			switch ( surface->format->BytesPerPixel ) {
			    case 1:
				surface->map->sw_data->blit =
				    SDL_CalculateBlit1(surface, blit_index);
				break;
			    case 2:
			    case 3:
			    case 4:
				surface->map->sw_data->blit =
				    SDL_CalculateBlitN(surface, blit_index);
				break;
			    default:
				surface->map->sw_data->blit = NULL;
				break;
			}
		}
	}
	/* Make sure we have a blit function */
	if ( surface->map->sw_data->blit == NULL ) {
		SDL_InvalidateMap(surface->map);
		SDL_SetError("Blit combination not supported");
		return(-1);
	}

	/* Choose software blitting function */
	if(surface->flags & SDL_RLEACCELOK
	   && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) {

	        if(surface->map->identity
		   && (blit_index == 1
		       || (blit_index == 3 && !surface->format->Amask))) {
		        if ( SDL_RLESurface(surface) == 0 )
			        surface->map->sw_blit = SDL_RLEBlit;
		} else if(blit_index == 2 && surface->format->Amask) {
		        if ( SDL_RLESurface(surface) == 0 )
			        surface->map->sw_blit = SDL_RLEAlphaBlit;
		}
	}
	
	if ( surface->map->sw_blit == NULL ) {
		surface->map->sw_blit = SDL_SoftBlit;
	}
	return(0);
}