/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  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 <XFree86/extensions/Xvlib.h>

#include "SDL_error.h"

#include "SDL_video.h"

#include "SDL_x11yuv_c.h"

#include "SDL_yuvfuncs.h"

#define XFREE86_REFRESH_HACK

#ifdef XFREE86_REFRESH_HACK

#include "SDL_x11image_c.h"

#endif

/* Workaround when pitch != width */

#define PITCH_WORKAROUND

/* Fix for the NVidia GeForce 2 - use the last available adaptor */

#define USE_LAST_ADAPTOR

/* 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;

	SDL_NAME(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, k;

	int adaptors;

	SDL_NAME(XvAdaptorInfo) *ainfo;

	XShmSegmentInfo *yuvshm;

	/* Look for the XVideo extension with a valid port for this format */

	xv_port = -1;

	if ( (Success == SDL_NAME(XvQueryExtension)(GFX_Display, &j, &j, &j, &j, &j)) &&

	     (Success == SDL_NAME(XvQueryAdaptors)(GFX_Display,

	                                 RootWindow(GFX_Display, SDL_Screen),

	                                 &adaptors, &ainfo)) ) {

#ifdef USE_LAST_ADAPTOR

		for ( i=0; i < adaptors; ++i ) {

#else

		for ( i=0; (i < adaptors) && (xv_port == -1); ++i ) {

#endif /* USE_LAST_ADAPTOR */

			/* Check to see if the visual can be used */

			if ( BUGGY_XFREE86(<=, 4001) ) {

				int visual_ok = 0;

				for ( j=0; j<ainfo[i].num_formats; ++j ) {

					if ( ainfo[i].formats[j].visual_id ==

							SDL_Visual->visualid ) {

						visual_ok = 1;

						break;

					}

				}

				if ( ! visual_ok ) {

					continue;

				}

			}

			if ( (ainfo[i].type & XvInputMask) &&

			     (ainfo[i].type & XvImageMask) ) {

				int num_formats;

				SDL_NAME(XvImageFormatValues) *formats;

				formats = SDL_NAME(XvListImageFormats)(GFX_Display,

				              ainfo[i].base_id, &num_formats);

#ifdef USE_LAST_ADAPTOR

				for ( j=0; j < num_formats; ++j ) {

#else

				for ( j=0; (j < num_formats) && (xv_port == -1); ++j ) {

#endif /* USE_LAST_ADAPTOR */

					if ( (Uint32)formats[j].id == format ) {

						for ( k=0; k < ainfo[i].num_ports; ++k ) {

							if ( Success == SDL_NAME(XvGrabPort)(GFX_Display, ainfo[i].base_id+k, CurrentTime) ) {

								xv_port = ainfo[i].base_id+k;

								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_NAME(XvUngrabPort)(GFX_Display, xv_port, CurrentTime);

		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;

	overlay->hw_overlay = 1;

	/* Create the pixel data and lookup tables */

	hwdata = (struct private_yuvhwdata *)malloc(sizeof *hwdata);

	overlay->hwdata = hwdata;

	if ( hwdata == NULL ) {

		SDL_NAME(XvUngrabPort)(GFX_Display, xv_port, CurrentTime);

		SDL_OutOfMemory();

		SDL_FreeYUVOverlay(overlay);

		return(NULL);

	}

	yuvshm = &hwdata->yuvshm;

	memset(yuvshm, 0, sizeof(*yuvshm));

	hwdata->port = xv_port;

	hwdata->image = SDL_NAME(XvShmCreateImage)(GFX_Display, xv_port, format,

	                                 0, width, height, yuvshm);

#ifdef PITCH_WORKAROUND

	if ( hwdata->image != NULL && hwdata->image->pitches[0] != width )

	{

	  /* Ajust overlay width according to pitch */ 

	  switch (format) {

	    case SDL_YV12_OVERLAY:

	    case SDL_IYUV_OVERLAY:

	        width = hwdata->image->pitches[0];

		break;

	    case SDL_YUY2_OVERLAY:

	    case SDL_UYVY_OVERLAY:

	    case SDL_YVYU_OVERLAY:

	        width = hwdata->image->pitches[0] / 2;

		break;

	    default:

		/* We should never get here (caught above) */

		return(NULL);

	  }

	  XFree(hwdata->image);

	  hwdata->image = SDL_NAME(XvShmCreateImage)(GFX_Display, xv_port, format,

					   0, width, height, yuvshm);

	}

#endif

	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  = (char *) 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);

	/* Find the pitch and offset values for the overlay */

	overlay->planes = hwdata->image->num_planes;

	overlay->pitches = (Uint16 *)malloc(overlay->planes * sizeof(Uint16));

	overlay->pixels = (Uint8 **)malloc(overlay->planes * sizeof(Uint8 *));

	if ( !overlay->pitches || !overlay->pixels ) {

		SDL_OutOfMemory();

		SDL_FreeYUVOverlay(overlay);

		return(NULL);

	}

	for ( i=0; i<overlay->planes; ++i ) {

		overlay->pitches[i] = hwdata->image->pitches[i];

		overlay->pixels[i] = (Uint8 *)hwdata->image->data +

		                              hwdata->image->offsets[i];

	}

#ifdef XFREE86_REFRESH_HACK

	/* Work around an XFree86 X server bug (?)

	   We can't perform normal updates in windows that have video

	   being output to them.  See SDL_x11image.c for more details.

	 */

	X11_DisableAutoRefresh(this);

#endif

	/* We're all done.. */

	return(overlay);

}

int X11_LockYUVOverlay(_THIS, SDL_Overlay *overlay)

{

	return(0);

}

void X11_UnlockYUVOverlay(_THIS, SDL_Overlay *overlay)

{

	return;

}

int X11_DisplayYUVOverlay(_THIS, SDL_Overlay *overlay, SDL_Rect *dstrect)

{

	struct private_yuvhwdata *hwdata;

	hwdata = overlay->hwdata;

	SDL_NAME(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 ) {

		SDL_NAME(XvUngrabPort)(GFX_Display, hwdata->port, CurrentTime);

		if ( hwdata->yuvshm.shmaddr ) {

			XShmDetach(GFX_Display, &hwdata->yuvshm);

			shmdt(hwdata->yuvshm.shmaddr);

		}

		if ( hwdata->image ) {

			XFree(hwdata->image);

		}

		free(hwdata);

	}

	if ( overlay->pitches ) {

		free(overlay->pitches);

		overlay->pitches = NULL;

	}

	if ( overlay->pixels ) {

		free(overlay->pixels);

		overlay->pixels = NULL;

	}

#ifdef XFREE86_REFRESH_HACK

	X11_EnableAutoRefresh(this);

#endif

}

#endif /* XFREE86_XV */