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/*
   render/screenshot.cc
   This file is part of the Osirion project and is distributed under 
   the terms of the GNU General Public License version 2 
*/

#include <iomanip>

#include "auxiliary/functions.h"
#include "core/core.h"
#include "filesystem/filesystem.h"
#include "render/state.h"
#include "render/screenshot.h"
#include "render/image.h"
#include "render/jpgfile.h"
#include "render/pngfile.h"
#include "render/tgafile.h"
#include "render/gl.h"

namespace render {

core::Cvar *Screenshot::screenshotformat = 0;
core::Cvar *Screenshot::screenshotquality = 0;


int Screenshot::number = 0;

void Screenshot::save()
{
        bool available = false;
	std::string filename;
	const int TYPETGA = 0;
	const int TYPEPNG = 1;
	const int TYPEJPG = 2;
	int filetype = TYPETGA;

	// make sure the screenshots folder exists
	filename.assign(filesystem::writedir());
	filename.append("screenshots");
	if (!sys::directory_exists(filename)) {
		sys::mkdir(filename);
	}
	filename += '/';

	aux::lowercase(screenshotformat->str());

	if ((screenshotformat->str().compare("jpg") == 0) || (screenshotformat->str().compare("jpeg") == 0)) {
		filetype = TYPEJPG;
		if (screenshotquality->value() == 0 ) {
			(*screenshotquality) = 85;
		} else if (screenshotquality->value() < 10) {
			(*screenshotquality) = 10;
		} else if (screenshotquality->value() > 100) {
			(*screenshotquality) = 100;
		}

	} else if (screenshotformat->str().compare("png") == 0) {
		filetype = TYPEPNG;

	} else if (screenshotformat->str().compare("tga") == 0) {
		filetype = TYPETGA;

	} else {
		filetype = TYPETGA;
		(*screenshotformat) = "tga";
	}

        // find the first available screenshots/osirion-yyyymmdd-hhmm-xxxx.ext
	std::stringstream filenamestr;
	int day, month, year, hour, min;
	
	sys::get_datetime(year, month, day, hour, min);
	
	filenamestr << filesystem::writedir() << "screenshots/osirion" << '-';
	// date
	filenamestr << std::setfill('0') << std::setw(4) << year << std::setw(2) << month << std::setw(2) << day << '-';
	// time 
	filenamestr << std::setfill('0') << std::setw(2) << hour << std::setw(2) << min << '-';

        do {
		std::stringstream nstr;
		nstr << std::setw(4) << std::setfill('0') << number;

		// sequence number
		filename.assign(filenamestr.str());
		filename.append(nstr.str());
		// extension
		filename.append(".");
		filename.append(screenshotformat->str());

                FILE *handle = fopen(filename.c_str(), "r");
                if (handle) {
                        fclose(handle);
                } else {
                        available = true;
                }
		number++;
        } while (!available);

	render::Image image(State::width(), State::height(), 3);

	glReadPixels(0, 0, (GLsizei) State::width(), (GLsizei) State::height(), 
		GL_RGB, GL_UNSIGNED_BYTE, (void *) image.data());

	image.flip();

	if (filetype == TYPEPNG) {
/*		if ((Camera::width() % 8 != 0 ) || (Camera::height() % 8 != 0 )) {
			image.pad();
		}*/
		render::PNG::save(filename.c_str(), image);
	} else if (filetype == TYPEJPG) {
/*		if ((Camera::width() % 8 != 0 ) || (Camera::height() % 8 != 0 )) {
			image.pad();
		}
*/
		render::JPG::save(filename.c_str(), image, (int) screenshotquality->value());
	} else if (filetype == TYPETGA) {
		render::TGA::save(filename.c_str(), image);
	}
}

} // namsepace render