view src/video/cybergfx/SDL_cgxyuv.c @ 1050:8e1815fd9777

Holding down shift while moving the mouse's scrollwheel on MacOS X makes the OS report these are "horizontal scrollwheel" events, which confuses gaming apps in several legitimate conditions. Now all scrollwheel events are made to look vertical when passed to the app. Patch by John Knottenbelt. http://www.libsdl.org/pipermail/sdl/2005-March/067978.html
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 17 Apr 2005 10:32:41 +0000
parents b8d311d90021
children c9b51268668f
line wrap: on
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/*
    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

/* This is the XFree86 Xv extension implementation of YUV video overlays */

#ifdef XFREE86_XV

#include <stdlib.h>
#include <string.h>
#include <X11/Xlib.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <X11/extensions/XShm.h>
#include <X11/extensions/Xvlib.h>

#include "SDL_error.h"
#include "SDL_video.h"
#include "SDL_x11yuv_c.h"
#include "SDL_yuvfuncs.h"

/* The functions used to manipulate software video overlays */
static struct private_yuvhwfuncs x11_yuvfuncs = {
	X11_LockYUVOverlay,
	X11_UnlockYUVOverlay,
	X11_DisplayYUVOverlay,
	X11_FreeYUVOverlay
};

struct private_yuvhwdata {
	int port;
	XShmSegmentInfo yuvshm;
	XvImage *image;
};


SDL_Overlay *X11_CreateYUVOverlay(_THIS, int width, int height, Uint32 format, SDL_Surface *display)
{
	SDL_Overlay *overlay;
	struct private_yuvhwdata *hwdata;
	int xv_port;
	int i, j;
	int adaptors;
	XvAdaptorInfo *ainfo;
	XShmSegmentInfo *yuvshm;

	xv_port = -1;
	if ( (Success == XvQueryExtension(GFX_Display, &j, &j, &j, &j, &j)) &&
	     (Success == XvQueryAdaptors(GFX_Display,
	                                 RootWindow(GFX_Display, SDL_Screen),
	                                 &adaptors, &ainfo)) ) {
		for ( i=0; (i<adaptors) && (xv_port == -1); ++i ) {
			if ( (ainfo[i].type & XvInputMask) &&
			     (ainfo[i].type & XvImageMask) ) {
				int num_formats;
				XvImageFormatValues *formats;
				formats = XvListImageFormats(GFX_Display,
				              ainfo[i].base_id, &num_formats);
				for ( j=0; j<num_formats; ++j ) {
					if ( (Uint32)formats[j].id == format ) {
						xv_port = ainfo[i].base_id;
						break;
					}
				}
			}
		}
	}
	if ( xv_port == -1 ) {
		SDL_SetError("No available video ports for requested format");
		return(NULL);
	}

	/* Create the overlay structure */
	overlay = (SDL_Overlay *)malloc(sizeof *overlay);
	if ( overlay == NULL ) {
		SDL_OutOfMemory();
		return(NULL);
	}
	memset(overlay, 0, (sizeof *overlay));

	/* Fill in the basic members */
	overlay->format = format;
	overlay->w = width;
	overlay->h = height;

	/* Set up the YUV surface function structure */
	overlay->hwfuncs = &x11_yuvfuncs;

	/* Create the pixel data and lookup tables */
	hwdata = (struct private_yuvhwdata *)malloc(sizeof *hwdata);
	overlay->hwdata = hwdata;
	if ( hwdata == NULL ) {
		SDL_OutOfMemory();
		SDL_FreeYUVOverlay(overlay);
		return(NULL);
	}
	yuvshm = &hwdata->yuvshm;
	memset(yuvshm, 0, sizeof(*yuvshm));
	hwdata->port = xv_port;
	hwdata->image = XvShmCreateImage(GFX_Display, xv_port, format,
	                                 0, width, height, yuvshm);
	if ( hwdata->image == NULL ) {
		SDL_OutOfMemory();
		SDL_FreeYUVOverlay(overlay);
		return(NULL);
	}
	yuvshm->shmid = shmget(IPC_PRIVATE, hwdata->image->data_size,
	                       IPC_CREAT | 0777);
	if ( yuvshm->shmid < 0 ) {
		SDL_SetError("Unable to get %d bytes shared memory",
		             hwdata->image->data_size);
		SDL_FreeYUVOverlay(overlay);
		return(NULL);
	}
	yuvshm->shmaddr  = (caddr_t) shmat(yuvshm->shmid, 0, 0);
	yuvshm->readOnly = False;
	hwdata->image->data = yuvshm->shmaddr;

	XShmAttach(GFX_Display, yuvshm);
	XSync(GFX_Display, False);
	shmctl(yuvshm->shmid, IPC_RMID, 0);

	/* We're all done.. */
	return(overlay);
}

int X11_LockYUVOverlay(_THIS, SDL_Overlay *overlay)
{
	overlay->pixels = overlay->hwdata->image->data;
	/* What should the pitch be set to? */
	return(0);
}

void X11_UnlockYUVOverlay(_THIS, SDL_Overlay *overlay)
{
	overlay->pixels = NULL;
}

int X11_DisplayYUVOverlay(_THIS, SDL_Overlay *overlay, SDL_Rect *dstrect)
{
	struct private_yuvhwdata *hwdata;

	hwdata = overlay->hwdata;
	XvShmPutImage(GFX_Display, hwdata->port, SDL_Window, SDL_GC,
	              hwdata->image, 0, 0, overlay->w, overlay->h,
	              dstrect->x, dstrect->y, dstrect->w, dstrect->h, False);
	XSync(GFX_Display, False);
	return(0);
}

void X11_FreeYUVOverlay(_THIS, SDL_Overlay *overlay)
{
	struct private_yuvhwdata *hwdata;

	hwdata = overlay->hwdata;
	if ( hwdata ) {
		if ( hwdata->yuvshm.shmaddr ) {
			XShmDetach(GFX_Display, &hwdata->yuvshm);
			shmdt(hwdata->yuvshm.shmaddr);
		}
		if ( hwdata->image ) {
			XFree(hwdata->image);
		}
		free(hwdata);
	}
}

#endif /* XFREE86_XV */