/*
 * Schism Tracker - a cross-platform Impulse Tracker clone
 * copyright (c) 2003-2005 Storlek <storlek@rigelseven.com>
 * copyright (c) 2005-2008 Mrs. Brisby <mrs.brisby@nimh.org>
 * copyright (c) 2009 Storlek & Mrs. Brisby
 * copyright (c) 2010-2012 Storlek
 * URL: http://schismtracker.org/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include "headers.h"

#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/extensions/Xvlib.h>

#ifndef HAVE_X11_EXTENSIONS_XVLIB_H
# error what
#endif

#include "sdlmain.h"
#include "video.h"
#include "osdefs.h"

unsigned int xv_yuvlayout(void)
{
        unsigned int ver, rev, eventB, reqB, errorB;
        XvImageFormatValues *formats;
        XvAdaptorInfo *ainfo;
        XvEncodingInfo *encodings;
        SDL_SysWMinfo info;
        Display *dpy;
        unsigned int nencode, nadaptors;
        unsigned int fmt = VIDEO_YUV_NONE;
        int numImages;
        int screen, nscreens, img;
        unsigned int adaptor, enc;
        unsigned int w, h;
        unsigned int best;

        memset(&info, 0, sizeof(info));
        SDL_VERSION(&info.version);
        if (SDL_GetWMInfo(&info)) {
                dpy = info.info.x11.display;
        } else {
                dpy = NULL;
                printf("sdl_getwminfo?\n");
        }

        if (!dpy) {
#if 0
                /* this never closes the display, thus causing a memleak
                (and we can't reasonably call XCloseDisplay ourselves) */
                dpy = XOpenDisplay(NULL);
                if (!dpy)
                        return VIDEO_YUV_NONE;
#else
                return VIDEO_YUV_NONE;
#endif
        }


        ver = rev = reqB = eventB = errorB = 0;
        if (XvQueryExtension(dpy, &ver, &rev, &reqB, &eventB, &errorB) != Success) {
                /* no XV support */
                return VIDEO_YUV_NONE;
        }

        nscreens = ScreenCount(dpy);
        w = h = 0;
        for (screen = 0; screen < nscreens; screen++) {
                XvQueryAdaptors(dpy, RootWindow(dpy, screen), &nadaptors, &ainfo);
                for (adaptor = 0; adaptor < nadaptors; adaptor++) {
                        XvQueryEncodings(dpy, ainfo[adaptor].base_id, &nencode, &encodings);
                        best = nencode; // impossible value
                        for (enc = 0; enc < nencode; enc++) {
                                if (strcmp(encodings[enc].name, "XV_IMAGE") != 0)
                                        continue;
                                if (encodings[enc].width > w || encodings[enc].height > h) {
                                        w = encodings[enc].width;
                                        h = encodings[enc].height;
                                        best = enc;
                                }
                        }
                        XvFreeEncodingInfo(encodings);

                        if (best == nencode || w < 640 || h < 400)
                                continue;

                        formats = XvListImageFormats(dpy, ainfo[adaptor].base_id, &numImages);
                        for (img = 0; img < numImages; img++) {
                                if (formats[img].type == XvRGB) continue;
                                if (w < 1280 || h < 400) {
                                        /* not enough xv memory for packed */
                                        switch (formats[img].id) {
                                        case VIDEO_YUV_YV12:
                                                fmt = VIDEO_YUV_YV12_TV;
                                                break;
                                        case VIDEO_YUV_IYUV:
                                                fmt = VIDEO_YUV_IYUV_TV;
                                                break;
                                        }
                                        continue;
                                }
                                switch (formats[img].id) {
                                case VIDEO_YUV_UYVY:
                                case VIDEO_YUV_YUY2:
                                case VIDEO_YUV_YVYU:
                                        /* a packed format, and we have enough memory... */
                                        fmt = formats[img].id;
                                        XFree(formats);
                                        XvFreeAdaptorInfo(ainfo);
                                        return fmt;

                                case VIDEO_YUV_YV12:
                                case VIDEO_YUV_IYUV:
                                        fmt = formats[img].id;
                                        break;
                                }
                        }
                        XFree(formats);
                }
                XvFreeAdaptorInfo(ainfo);
        }
        return fmt;
}

