/*

 * pixmap.cc: 2D image class

 *

 * This file is part of Pyrit Ray Tracer.

 *

 * Copyright 2008  Radek Brich

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include <stdio.h>

#ifdef HAVE_PNG

#	include <png.h>

#endif

#include "pixmap.h"

unsigned char *Pixmap::getCharData() const

{

	unsigned char *cdata = new unsigned char[w*h*3];

	Float *fd = fdata;

	for (unsigned char *cd = cdata; cd != cdata + w*h*3; cd++, fd++)

	{

		if (*fd > 1.0)

			*cd = 255;

		else

			*cd = (unsigned char)(*fd * 255.0);

	}

	return cdata;

}

int Pixmap::writePNG(const char *fname) const

{

#ifndef HAVE_PNG

	return -3;

#else

	int y;

	FILE *f;

	png_structp png;   /* PNG data */

	png_infop pnginfo; /* PNG info */

	unsigned char *cdata, *d;

	if ((f = fopen(fname, "wb")) == NULL)

		return -1;

	png = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);

	if (!png) {

		fclose(f);

		return -2;

	}

	pnginfo = png_create_info_struct(png);

	if (!pnginfo) {

		fclose(f);

		png_destroy_write_struct(&png, 0);

		return -2;

	}

	if (setjmp(png_jmpbuf(png))) {

		fclose(f);

		png_destroy_info_struct(png, &pnginfo);

		png_destroy_write_struct(&png, &pnginfo);

		return -2;

	}

	/* predat knihovne PNG ukazatel na soubor */

	png_init_io(png, f);

	/* parametry PNG */

	png_set_compression_level(png, Z_BEST_COMPRESSION);

	png_set_IHDR(png, pnginfo, w, h, 8, PNG_COLOR_TYPE_RGB,

		PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,

		PNG_FILTER_TYPE_DEFAULT);

	png_set_sRGB(png, pnginfo, PNG_sRGB_INTENT_PERCEPTUAL);

	png_set_sRGB_gAMA_and_cHRM(png, pnginfo, PNG_INFO_sRGB);

	/* zapsat hlavicku */

	png_write_info(png, pnginfo);

	/* zapsat data */

	d = cdata = getCharData();

	for (y = 0; y < h; y++, d += w * 3)

		png_write_row(png, (png_byte *) d);

	/* ukoncit soubor a uvolnit pomocne struktury */

	png_write_end(png, pnginfo);

	png_destroy_info_struct(png, &pnginfo);

	png_destroy_write_struct(&png, 0);

	fclose(f);

	delete[] cdata;

	return 0;

#endif

}