/*
 * Copyright 2011, Blender Foundation.
 *
 * 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.
 *
 * Contributor: 
 *		Jeroen Bakker 
 *		Monique Dewanchand
 */

#include "COM_PreviewOperation.h"
#include "COM_SocketConnection.h"
#include "BLI_listbase.h"
#include "DNA_scene_types.h"
#include "BKE_image.h"
#include "WM_api.h"
#include "WM_types.h"
#include "PIL_time.h"
#include "BLI_utildefines.h"
#include "BLI_math_color.h"
#include "COM_defines.h"
#include "BLI_math.h"
extern "C" {
	#include "MEM_guardedalloc.h"
	#include "IMB_imbuf.h"
	#include "IMB_imbuf_types.h"
}


PreviewOperation::PreviewOperation() : NodeOperation() {
	this->addInputSocket(COM_DT_COLOR, COM_SC_NO_RESIZE);
	this->outputBuffer = NULL;
	this->input = NULL;
	this->divider = 1.0f;
	this->node = NULL;
	this->priority = 0;
}

void PreviewOperation::initExecution() {
	this->input = getInputSocketReader(0);
	if (!this->node->preview) {
		this->node->preview = (bNodePreview*)MEM_callocN(sizeof(bNodePreview), "node preview");
	}
	else {
		if (this->getWidth() == (unsigned int)this->node->preview->xsize && this->getHeight() == (unsigned int)this->node->preview->ysize) {
			this->outputBuffer = this->node->preview->rect;
		}
	}

	if (this->outputBuffer == NULL) {
		this->outputBuffer = (unsigned char*)MEM_callocN(sizeof(unsigned char)*4*getWidth()*getHeight(), "PreviewOperation");
		if (this->node->preview->rect) {
				MEM_freeN(this->node->preview->rect);
		}
		this->node->preview->xsize= getWidth();
		this->node->preview->ysize= getHeight();
		this->node->preview->rect= outputBuffer;
	}
}

void PreviewOperation::deinitExecution() {
	this->outputBuffer = NULL;
	this->input = NULL;
}

void PreviewOperation::executeRegion(rcti *rect, unsigned int tileNumber, MemoryBuffer **memoryBuffers) {
	int offset;
	float color[4];
	for (int y = rect->ymin ; y < rect->ymax ; y++) {
		offset = (y * getWidth() + rect->xmin)*4;
		for (int x = rect->xmin ; x < rect->xmax ; x++) {
			float rx = floor(x/divider);
			float ry = floor(y/divider);
	
			color[0] = 0.0f;
			color[1] = 0.0f;
			color[2] = 0.0f;
			color[3] = 1.0f;
			input->read(color, rx, ry, COM_PS_NEAREST, memoryBuffers);
			/// @todo: linear conversion only when scene color management is selected, also check predivide.
			linearrgb_to_srgb_v4(color, color);
			F4TOCHAR4(color, outputBuffer+offset);
			offset +=4;
		}
	}
}
bool PreviewOperation::determineDependingAreaOfInterest(rcti *input, ReadBufferOperation *readOperation, rcti *output) {
	rcti newInput;

	newInput.xmin = input->xmin/divider;
	newInput.xmax = input->xmax/divider;
	newInput.ymin = input->ymin/divider;
	newInput.ymax = input->ymax/divider;

	return NodeOperation::determineDependingAreaOfInterest(&newInput, readOperation, output);
}
void PreviewOperation::determineResolution(unsigned int resolution[], unsigned int preferredResolution[]) {
	NodeOperation::determineResolution(resolution, preferredResolution);
	int width = resolution[0];
	int height = resolution[1];
	this->divider = 0.0f;
	if (width > height) {
		divider = COM_PREVIEW_SIZE / (width-1);
	}
	else {
		divider = COM_PREVIEW_SIZE / (height-1);
	}
	width = width * divider;
	height = height * divider;
	
	resolution[0] = width;
	resolution[1] = height;
}

const int PreviewOperation::getRenderPriority() const {
	return this->priority;
}