/******************************************************************************
*                            recordMyDesktop                                  *
*******************************************************************************
*                                                                             *
*            Copyright (C) 2006,2007,2008 John Varouhakis                     *
*                                                                             *
*                                                                             *
*   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  *
*                                                                             *
*                                                                             *
*                                                                             *
*   For further information contact me at johnvarouhakis@gmail.com            *
******************************************************************************/

#include "config.h"
#include "rmd_setbrwindow.h"

#include "rmd_types.h"


/**
*Align the recording window to a divisible by 2 pixel start and
*and a size divisible by 16.
*
* \param start x or y of the recording window
*
* \param size  width or height of the recording window
*
* \param limit  width or height of the Display
*
* \note This is called separately for width and height.
*/
static void rmdSizePack2_8_16(short *start, unsigned short *size, unsigned short limit) {
	int octoffset,hexoffset;

	//align in two
	//an odd x can always go down and still be in recording area.
	//Resolutions come in even numbers
	//so if x is an odd numer, width max is an odd number, too
	//thus since x will go down one then width can go up one too and still
	//be inbounds
	(*size)+=((*size)%2)|((*start)%2);
	//but if x goes down 1 and width is already even,it becomes odd so:
	(*size)+=((*size)%2);
	(*start)-=(*start)%2;

	//32 bit pack align
	//we already have disible by two width,so
	//it's 2, 4 or 6
	octoffset=((*size)%8);
	if (octoffset==2) {
		(*size)-=2;
	} else if (octoffset==6) {
		if ((*size)+(*start)+2<=limit)
			(*size)+=2;
		else if ((*start)>=2) {
			(*start)-=2;
			(*size)+=2;
		} else{
			(*start)+=2;
			(*size)-=4;
		}
	} else if (octoffset==4) {
		if (((*size)+(*start)+2<=limit)&&((*start)>=2)) {
			(*start)-=2;
			(*size)+=4;
		} else if ((*size)+(*start)+4<=limit) {
			(*size)+=4;
		} else if ((*start)>=4) {
			(*start)-=4;
			(*size)+=4;
		} else {
			(*start)+=2;
			(*size)-=4;
		}
	}

	//16 divisble width(needed for shared memory only,
	//but applied anyway since theora wants it, too)
	//we already have divisibility by 8 so module
	//by 16 is euther 8 or 0
	hexoffset=((*size)%16);
	if (hexoffset) {
		if (((*size)+(*start)+4<=limit)&&((*start)>=4)) {
			(*start)-=4;
			(*size)+=8;
		} else if ((*size)+(*start)+8<=limit) {
			(*size)+=8;
		} else if ((*start)>=8) {
			(*start)-=8;
			(*size)+=8;
		} else {
			(*start)+=4;
			(*size)-=8;
		}
	}
}

boolean rmdSetBRWindow(	Display *dpy,
			BRWindow *brwin,
			DisplaySpecs *specs,
			ProgArgs *args) {

	//before we start recording we have to make sure the ranges are valid
	if (args->windowid==0) {//root window
		//first set it up
		brwin->windowid=specs->root;
		brwin->winrect.x=brwin->winrect.y=0;
		brwin->winrect.width=specs->width;
		brwin->winrect.height=specs->height;
		brwin->rrect.x=args->x;
		brwin->rrect.y=args->y;
		brwin->rrect.width=((args->width)? args->width:specs->width-brwin->rrect.x);
		brwin->rrect.height=((args->height)? args->height:specs->height-brwin->rrect.y);
		//and then check validity
		if ((brwin->rrect.x+brwin->rrect.width>specs->width)||
			(brwin->rrect.y+brwin->rrect.height>specs->height)) {
			fprintf(stderr,	"Window size specification out of bounds!"
					"(current resolution:%dx%d)\n",
					specs->width,specs->height);
			return FALSE;
		}
	} else {
		Window wchid;
		int transl_x,transl_y;

		XWindowAttributes attribs;
		XGetWindowAttributes(dpy,args->windowid,&attribs);

		if ((attribs.map_state==IsUnviewable)||(attribs.map_state==IsUnmapped)) {
			fprintf(stderr,"Window must be mapped and visible!\n");
			return FALSE;
		}

		XTranslateCoordinates(	dpy,
					specs->root,
					args->windowid,
					attribs.x,
					attribs.y,
					&transl_x,
					&transl_y,
					&wchid);

		brwin->winrect.x=attribs.x-transl_x;
		brwin->winrect.y=attribs.y-transl_y;
		brwin->winrect.width=attribs.width;
		brwin->winrect.height=attribs.height;

		if ((brwin->winrect.x+brwin->winrect.width>specs->width)||
			(brwin->winrect.y+brwin->winrect.height>specs->height)) {
			fprintf(stderr,"Window must be on visible screen area!\n");
			return FALSE;
		}

		brwin->rrect.x=brwin->winrect.x+args->x;
		brwin->rrect.y=brwin->winrect.y+args->y;
		brwin->rrect.width=((args->width)? args->width:brwin->winrect.width-args->x);
		brwin->rrect.height=((args->height)? args->height:brwin->winrect.height-args->y);

		if ((args->x+brwin->rrect.width>brwin->winrect.width)||
			(args->y+brwin->rrect.height>brwin->winrect.height)) {
			fprintf(stderr,"Specified Area is larger than window!\n");
			return FALSE;
		}
	}

	fprintf(stderr,	"Initial recording window is set to:\n"
			"X:%d   Y:%d	Width:%d	Height:%d\n",
			brwin->rrect.x,brwin->rrect.y,
			brwin->rrect.width,brwin->rrect.height);

	rmdSizePack2_8_16(&brwin->rrect.x,&brwin->rrect.width,specs->width);
	rmdSizePack2_8_16(&brwin->rrect.y,&brwin->rrect.height,specs->height);

	fprintf(stderr,	"Adjusted recording window is set to:\n"
			"X:%d   Y:%d	Width:%d	Height:%d\n",
			brwin->rrect.x,brwin->rrect.y,
			brwin->rrect.width,brwin->rrect.height);

	return TRUE;
}