/**
 * $Id$
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * Contributor(s): Blender Foundation, 2002-2009
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include <stdlib.h>
#include <stdio.h>

#include "DNA_screen_types.h"
#include "DNA_space_types.h"

#include "BKE_context.h"
#include "BKE_image.h"

#include "BIF_gl.h"
#include "BIF_glutil.h"


#include "RE_pipeline.h"


#define HEADER_HEIGHT 18

/* *********************** render callbacks ***************** */

/* set on initialize render, only one render output to imagewindow can exist, so the global isnt dangerous yet :) */
static ScrArea *image_area= NULL;

/* can get as well the full picture, as the parts while rendering */
/* XXX will be obsolete, here for reference now */
void imagewindow_progress(SpaceImage *sima, RenderResult *rr, volatile rcti *renrect)
{
	float x1, y1, *rectf= NULL;
	unsigned int *rect32= NULL;
	int ymin, ymax, xmin, xmax;
	
	/* if renrect argument, we only display scanlines */
	if(renrect) {
		/* if ymax==recty, rendering of layer is ready, we should not draw, other things happen... */
		if(rr->renlay==NULL || renrect->ymax>=rr->recty)
			return;
		
		/* xmin here is first subrect x coord, xmax defines subrect width */
		xmin = renrect->xmin;
		xmax = renrect->xmax - xmin;
		if (xmax<2) return;
		
		ymin= renrect->ymin;
		ymax= renrect->ymax - ymin;
		if(ymax<2)
			return;
		renrect->ymin= renrect->ymax;
	}
	else {
		xmin = ymin = 0;
		xmax = rr->rectx - 2*rr->crop;
		ymax = rr->recty - 2*rr->crop;
	}
	
	/* image window cruft */
	
	/* find current float rect for display, first case is after composit... still weak */
	if(rr->rectf)
		rectf= rr->rectf;
	else {
		if(rr->rect32)
			rect32= (unsigned int *)rr->rect32;
		else {
			if(rr->renlay==NULL || rr->renlay->rectf==NULL) return;
			rectf= rr->renlay->rectf;
		}
	}
	if(rectf) {
		/* if scanline updates... */
		rectf+= 4*(rr->rectx*ymin + xmin);
		
		/* when rendering more pixels than needed, we crop away cruft */
		if(rr->crop)
			rectf+= 4*(rr->crop*rr->rectx + rr->crop);
	}
	
	/* tilerect defines drawing offset from (0,0) */
	/* however, tilerect (xmin, ymin) is first pixel */
	x1 = sima->centx + (rr->tilerect.xmin + rr->crop + xmin)*sima->zoom;
	y1 = sima->centy + (rr->tilerect.ymin + rr->crop + ymin)*sima->zoom;
	
	/* needed for gla draw */
	// XXX { rcti rct= ar->winrct; rct.ymax-= HEADER_HEIGHT; glaDefine2DArea(&rct);}

	glPixelZoom(sima->zoom, sima->zoom);
	
	if(rect32)
		glaDrawPixelsSafe(x1, y1, xmax, ymax, rr->rectx, GL_RGBA, GL_UNSIGNED_BYTE, rect32);
	else
		glaDrawPixelsSafe_to32(x1, y1, xmax, ymax, rr->rectx, rectf, 0);
	
	glPixelZoom(1.0, 1.0);
	
}


/* coming from BIF_toggle_render_display() */
void imagewindow_toggle_render(bContext *C)
{
	bScreen *sc= CTX_wm_screen(C);
	ScrArea *sa;
	
	/* check if any imagewindow is showing temporal render output */
	for(sa=sc->areabase.first; sa; sa= sa->next) {
		if(sa->spacetype==SPACE_IMAGE) {
			SpaceImage *sima= sa->spacedata.first;
			
			if(sima->image && sima->image->type==IMA_TYPE_R_RESULT)
				if(sima->flag & (SI_PREVSPACE|SI_FULLWINDOW))
					break;
		}
	}

	if(sa) {
		// XXX addqueue(sa->win, ESCKEY, 1);	/* also returns from fullscreen */
	}
	else {
//		sa= imagewindow_set_render_display(C);
		// XXX scrarea_queue_headredraw(sa);
		// XXX scrarea_queue_winredraw(sa);
	}
}

/* NOTE: called while render, so no malloc allowed! */
static void imagewindow_renderinfo_cb(void *UNUSED(handle), RenderStats *UNUSED(rs))
{
	if(image_area) {
		// XXX BIF_make_render_text(rs);

		// XXX sima_draw_render_info(sima, ar);
		
		/* no screen_swapbuffers, prevent any other window to draw */
		// XXX myswapbuffers();
	}
}

void ED_space_image_render_callbacks(bContext *C, Render *re)
{
	
//	RE_display_init_cb(re, C, imagewindow_init_display_cb);
//	RE_display_draw_cb(re, C, imagewindow_progress_display_cb);
//	RE_display_clear_cb(re, C, imagewindow_clear_display_cb);
	RE_stats_draw_cb(re, C, imagewindow_renderinfo_cb);	
}