/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 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

    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public

    License along with this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

#include <X11/Xlib.h>

#include <X11/Xutil.h>

#include "SDL_version.h"

#include "SDL_timer.h"

#include "SDL_video.h"

#include "SDL_syswm.h"

#include "../SDL_pixels_c.h"

#include "../../events/SDL_events_c.h"

#include "SDL_x11modes_c.h"

#include "SDL_x11wm_c.h"

static Uint8 reverse_byte(Uint8 x)

{

	x = (x & 0xaa) >> 1 | (x & 0x55) << 1;

	x = (x & 0xcc) >> 2 | (x & 0x33) << 2;

	x = (x & 0xf0) >> 4 | (x & 0x0f) << 4;

	return x;

}

void X11_SetIcon(_THIS, SDL_Surface *icon, Uint8 *mask)

{

	SDL_Surface *sicon;

	XWMHints *wmhints;

	XImage *icon_image;

	Pixmap icon_pixmap;

	Pixmap mask_pixmap;

	Window icon_window = None;

	GC gc;

	XGCValues GCvalues;

	int i, dbpp;

	SDL_Rect bounds;

	Uint8 *LSBmask;

	Visual *dvis;

	char *p;

	int masksize;

	SDL_Lock_EventThread();

	/* The icon must use the default visual, depth and colormap of the

	   screen, so it might need a conversion */

	dvis = DefaultVisual(SDL_Display, SDL_Screen);

	dbpp = DefaultDepth(SDL_Display, SDL_Screen);

	for(i = 0; i < this->hidden->nvisuals; i++) {

		if(this->hidden->visuals[i].visual == dvis) {

			dbpp = this->hidden->visuals[i].bpp;

			break;

		}

	}

	/* The Visual struct is supposed to be opaque but we cheat a little */

	sicon = SDL_CreateRGBSurface(SDL_SWSURFACE, icon->w, icon->h,

				     dbpp,

				     dvis->red_mask, dvis->green_mask,

				     dvis->blue_mask, 0);

	if ( sicon == NULL )

		goto done;

	if(dbpp == 8) {

		/* Default visual is 8bit; we need to allocate colours from

		   the default colormap */

		SDL_Color want[256], got[256];

		int nwant;

		Colormap dcmap;

		int missing;

		dcmap = DefaultColormap(SDL_Display, SDL_Screen);

		if(icon->format->palette) {

			/* The icon has a palette as well - we just have to

			   find those colours */

			nwant = icon->format->palette->ncolors;

			SDL_memcpy(want, icon->format->palette->colors,

			       nwant * sizeof want[0]);

		} else {

			/* try the standard 6x6x6 cube for lack of better

			   ideas */

			int r, g, b, i;

			for(r = i = 0; r < 256; r += 0x33)

				for(g = 0; g < 256; g += 0x33)

					for(b = 0; b < 256; b += 0x33, i++) {

						want[i].r = r;

						want[i].g = g;

						want[i].b = b;

					}

			nwant = 216;

		}

		if(SDL_iconcolors) {

			/* free already allocated colours first */

			unsigned long freelist[512];

			int nfree = 0;

			for(i = 0; i < 256; i++) {

				while(SDL_iconcolors[i]) {

					freelist[nfree++] = i;

					SDL_iconcolors[i]--;

				}

			}

			XFreeColors(GFX_Display, dcmap, freelist, nfree, 0);

		}

		if(!SDL_iconcolors)

			SDL_iconcolors = SDL_malloc(256 * sizeof *SDL_iconcolors);

		SDL_memset(SDL_iconcolors, 0, 256 * sizeof *SDL_iconcolors);

		/* try to allocate the colours */

		SDL_memset(got, 0, sizeof got);

		missing = 0;

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

			XColor c;

			c.red = want[i].r << 8;

			c.green = want[i].g << 8;

			c.blue = want[i].b << 8;

			c.flags = DoRed | DoGreen | DoBlue;

			if(XAllocColor(GFX_Display, dcmap, &c)) {

				/* got the colour */

				SDL_iconcolors[c.pixel]++;

				got[c.pixel] = want[i];

			} else {

				missing = 1;

			}

		}

		if(missing) {

			/* Some colours were apparently missing, so we just

			   allocate all the rest as well */

			XColor cols[256];

			for(i = 0; i < 256; i++)

				cols[i].pixel = i;

			XQueryColors(GFX_Display, dcmap, cols, 256);

			for(i = 0; i < 256; i++) {

				got[i].r = cols[i].red >> 8;

				got[i].g = cols[i].green >> 8;

				got[i].b = cols[i].blue >> 8;

				if(!SDL_iconcolors[i]) {

					if(XAllocColor(GFX_Display, dcmap,

							cols + i)) {

						SDL_iconcolors[i] = 1;

					} else {

						/* index not available */

						got[i].r = 0;

						got[i].g = 0;

						got[i].b = 0;

					}

				}

			}

		}

		SDL_SetColors(sicon, got, 0, 256);

	}

	bounds.x = 0;

	bounds.y = 0;

	bounds.w = icon->w;

	bounds.h = icon->h;

	if ( SDL_LowerBlit(icon, &bounds, sicon, &bounds) < 0 )

		goto done;

	/* We need the mask as given, except in LSBfirst format instead of

	   MSBfirst. Reverse the bits in each byte. */

	masksize = ((sicon->w + 7) >> 3) * sicon->h;

	LSBmask = SDL_malloc(masksize);

	if ( LSBmask == NULL ) {

		goto done;

	}

	SDL_memset(LSBmask, 0, masksize);

	for(i = 0; i < masksize; i++)

		LSBmask[i] = reverse_byte(mask[i]);

	mask_pixmap = XCreatePixmapFromBitmapData(SDL_Display, WMwindow,

						  (char *)LSBmask,

						  sicon->w, sicon->h,

						  1L, 0L, 1);

	/* Transfer the image to an X11 pixmap */

	icon_image = XCreateImage(SDL_Display,

				  DefaultVisual(SDL_Display, SDL_Screen),

				  DefaultDepth(SDL_Display, SDL_Screen),

				  ZPixmap, 0, sicon->pixels,

				  sicon->w, sicon->h,

				  32, 0);

	icon_image->byte_order = (SDL_BYTEORDER == SDL_BIG_ENDIAN)

		                 ? MSBFirst : LSBFirst;

	icon_pixmap = XCreatePixmap(SDL_Display, SDL_Root, sicon->w, sicon->h,

				    DefaultDepth(SDL_Display, SDL_Screen));

	gc = XCreateGC(SDL_Display, icon_pixmap, 0, &GCvalues);

	XPutImage(SDL_Display, icon_pixmap, gc, icon_image,

		  0, 0, 0, 0, sicon->w, sicon->h);

	XFreeGC(SDL_Display, gc);

	XDestroyImage(icon_image);

	SDL_free(LSBmask);

	sicon->pixels = NULL;

	/* Some buggy window managers (some versions of Enlightenment, it

	   seems) need an icon window *and* icon pixmap to work properly, while

	   it screws up others. The default is only to use a pixmap. */

	p = SDL_getenv("SDL_VIDEO_X11_ICONWIN");

	if(p && *p) {

		icon_window = XCreateSimpleWindow(SDL_Display, SDL_Root,

						  0, 0, sicon->w, sicon->h, 0,

						  CopyFromParent,

						  CopyFromParent);

		XSetWindowBackgroundPixmap(SDL_Display, icon_window,

					   icon_pixmap);

		XClearWindow(SDL_Display, icon_window);

	}

	/* Set the window icon to the icon pixmap (and icon window) */

	wmhints = XAllocWMHints();

	wmhints->flags = (IconPixmapHint | IconMaskHint);

	wmhints->icon_pixmap = icon_pixmap;

	wmhints->icon_mask = mask_pixmap;

	if(icon_window != None) {

		wmhints->flags |= IconWindowHint;

		wmhints->icon_window = icon_window;

	}

	XSetWMHints(SDL_Display, WMwindow, wmhints);

	XFree(wmhints);

	XSync(SDL_Display, False);

  done:

	SDL_Unlock_EventThread();

	SDL_FreeSurface(sicon);

}

void X11_SetCaptionNoLock(_THIS, const char *title, const char *icon)

{

	XTextProperty titleprop, iconprop;

	Status status;

#ifdef X_HAVE_UTF8_STRING

	Atom _NET_WM_NAME = 0;

	Atom _NET_WM_ICON_NAME = 0;

	/* Look up some useful Atoms */

	if (SDL_X11_HAVE_UTF8) {

		_NET_WM_NAME = XInternAtom(SDL_Display, "_NET_WM_NAME", False);

		_NET_WM_ICON_NAME = XInternAtom(SDL_Display, "_NET_WM_ICON_NAME", False);

	}

#endif

	if ( title != NULL ) {

		char *title_locale = SDL_iconv_utf8_locale(title);

		if ( !title_locale ) {

			SDL_OutOfMemory();

			return;

		}

		status = XStringListToTextProperty(&title_locale, 1, &titleprop);

		SDL_free(title_locale);

		if ( status ) {

			XSetTextProperty(SDL_Display, WMwindow, &titleprop, XA_WM_NAME);

			XFree(titleprop.value);

		}

#ifdef X_HAVE_UTF8_STRING

		if (SDL_X11_HAVE_UTF8) {

			status = Xutf8TextListToTextProperty(SDL_Display,

					(char **)&title, 1, XUTF8StringStyle, &titleprop);

			if ( status == Success ) {

				XSetTextProperty(SDL_Display, WMwindow, &titleprop, _NET_WM_NAME);

				XFree(titleprop.value);

			}

		}

#endif

	}

	if ( icon != NULL ) {

		char *icon_locale = SDL_iconv_utf8_locale(icon);

		if ( !icon_locale ) {

			SDL_OutOfMemory();

			return;

		}

		status = XStringListToTextProperty(&icon_locale, 1, &iconprop);

		SDL_free(icon_locale);

		if ( status ) {

			XSetTextProperty(SDL_Display, WMwindow, &iconprop, XA_WM_ICON_NAME);

			XFree(iconprop.value);

		}

#ifdef X_HAVE_UTF8_STRING

		if (SDL_X11_HAVE_UTF8) {

			status = Xutf8TextListToTextProperty(SDL_Display,

					(char **)&icon, 1, XUTF8StringStyle, &iconprop);

			if ( status == Success ) {

				XSetTextProperty(SDL_Display, WMwindow, &iconprop, _NET_WM_ICON_NAME);

				XFree(iconprop.value);

			}

		}

#endif

	}

	XSync(SDL_Display, False);

}

void X11_SetCaption(_THIS, const char *title, const char *icon)

{

	SDL_Lock_EventThread();

	X11_SetCaptionNoLock(this, title, icon);

	SDL_Unlock_EventThread();

}

/* Iconify the window */

int X11_IconifyWindow(_THIS)

{

	int result;

	SDL_Lock_EventThread();

	result = XIconifyWindow(SDL_Display, WMwindow, SDL_Screen);

	XSync(SDL_Display, False);

	SDL_Unlock_EventThread();

	return(result);

}

SDL_GrabMode X11_GrabInputNoLock(_THIS, SDL_GrabMode mode)

{

	int result;

	if ( this->screen == NULL ) {

		return(SDL_GRAB_OFF);

	}

	if ( ! SDL_Window ) {

		return(mode);	/* Will be set later on mode switch */

	}

	if ( mode == SDL_GRAB_OFF ) {

		XUngrabPointer(SDL_Display, CurrentTime);

		XUngrabKeyboard(SDL_Display, CurrentTime);

	} else {

		if ( this->screen->flags & SDL_FULLSCREEN ) {

			/* Unbind the mouse from the fullscreen window */

			XUngrabPointer(SDL_Display, CurrentTime);

		}

		/* Try to grab the mouse */

#if 0 /* We'll wait here until we actually grab, otherwise behavior undefined */

		for ( numtries = 0; numtries < 10; ++numtries ) {

#else

		for ( ; ; ) {

#endif

			result = XGrabPointer(SDL_Display, SDL_Window, True, 0,

						GrabModeAsync, GrabModeAsync,

						SDL_Window, None, CurrentTime);

			if ( result == GrabSuccess ) {

				break;

			}

			SDL_Delay(100);

		}

		if ( result != GrabSuccess ) {

			/* Uh, oh, what do we do here? */ ;

		}

		/* Now grab the keyboard */

		XGrabKeyboard(SDL_Display, WMwindow, True,

				GrabModeAsync, GrabModeAsync, CurrentTime);

		/* Raise the window if we grab the mouse */

		if ( !(this->screen->flags & SDL_FULLSCREEN) )

			XRaiseWindow(SDL_Display, WMwindow);

		/* Make sure we register input focus */

		SDL_PrivateAppActive(1, SDL_APPINPUTFOCUS);

		/* Since we grabbed the pointer, we have mouse focus, too. */

		SDL_PrivateAppActive(1, SDL_APPMOUSEFOCUS);

	}

	XSync(SDL_Display, False);

	return(mode);

}

SDL_GrabMode X11_GrabInput(_THIS, SDL_GrabMode mode)

{

	SDL_Lock_EventThread();

	mode = X11_GrabInputNoLock(this, mode);

	SDL_Unlock_EventThread();

	return(mode);

}

/* If 'info' is the right version, this function fills it and returns 1.

   Otherwise, in case of a version mismatch, it returns -1.

*/

static void lock_display(void)

{

	SDL_Lock_EventThread();

}

static void unlock_display(void)

{

	/* Make sure any X11 transactions are completed */

	SDL_VideoDevice *this = current_video;

	XSync(SDL_Display, False);

	SDL_Unlock_EventThread();

}

#include <stdio.h>

int X11_GetWMInfo(_THIS, SDL_SysWMinfo *info)

{

	if ( info->version.major <= SDL_MAJOR_VERSION ) {

		info->subsystem = SDL_SYSWM_X11;

		info->info.x11.display = SDL_Display;

		info->info.x11.window = SDL_Window;

		if ( SDL_VERSIONNUM(info->version.major,

		                    info->version.minor,

		                    info->version.patch) >= 1002 ) {

			info->info.x11.fswindow = FSwindow;

			info->info.x11.wmwindow = WMwindow;

		}

		if ( SDL_VERSIONNUM(info->version.major,

		                    info->version.minor,

		                    info->version.patch) >= 1212 ) {

			info->info.x11.gfxdisplay = GFX_Display;

		}

		info->info.x11.lock_func = lock_display;

		info->info.x11.unlock_func = unlock_display;

		return(1);

	} else {

		SDL_SetError("Application not compiled with SDL %d.%d\n",

					SDL_MAJOR_VERSION, SDL_MINOR_VERSION);

		return(-1);

	}

}