WSL/SLF GitLab Repository

PNGIO.cc 19.4 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
/***********************************************************************************/
/*  Copyright 2009 WSL Institute for Snow and Avalanche Research    SLF-DAVOS      */
/***********************************************************************************/
/* This file is part of MeteoIO.
    MeteoIO is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    MeteoIO 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with MeteoIO.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "PNGIO.h"
#include <meteoio/ResamplingAlgorithms2D.h>
20
#include <meteoio/Graphics.h>
21
22
23
24
25
26
27

#include <algorithm>

using namespace std;

namespace mio {
/**
28
 * @page pngio PNGIO
29
30
 * @section template_format Format
 * *Put here the informations about the standard format that is implemented*
31
 * No data read, only write (because of gradients)
32
 * Finally, the naming scheme for meteo grids should be: YYYYMMDDHHmm_{MeteoGrids::Parameters}.png
33
34
 *
 * @section template_units Units
35
 * All units are MKSA except temperatures that are expressed in celcius.
36
37
38
 *
 * @section template_keywords Keywords
 * This plugin uses the following keywords:
39
40
 * - COORDSYS: input coordinate system (see Coords) specified in the [Output] section
 * - COORDPARAM: extra input coordinates parameters (see Coords) specified in the [Output] section
41
42
43
 * - png_legend: plot legend on the side of the graph? (default: true)
 * - png_min_size: guarantee that a 2D plot will have at least the given size
 * - png_max_size: guarantee that a 2D plot will have at most the given size
44
 * - png_scaling: scaling algorithm, either nearest or bilinear (default=bilinear)
45
46
 * - png_autoscale: autoscale for the color gradient? (default=true)
 * - png_world_file: create world file with each file? (default=false)
47
48
 *
 * The size are specified as width followed by height, with the separator being either a space, 'x' or '*'. If a minimum and a maximum size are given, the average of the smallest and largest permissible sizes will be used.
49
50
51
52
53
54
55
56
57
58
59
 * The world file is used for geolocalization and goes alongside the graphics output. By convention,
 * the file has the same name as the image file, with the third letter of the extension jammed with a w: tif->tfw, jpg->jqw.
 * The format is the following:
 * @code
 *    5.000000000000 (size of pixel in x direction)
 *    0.000000000000 (rotation term for row)
 *    0.000000000000 (rotation term for column)
 *    -5.000000000000 (size of pixel in y direction)
 *    492169.690845528910 (x coordinate of centre of upper left pixel in map units)
 *    5426523.318065105000 (y coordinate of centre of upper left pixel in map units)
 * @endcode
60
 *
61
 * @section example Example use
62
63
64
65
66
67
 * @code
 * GRID2D = PNG
 * png_legend = false
 * png_min_size = 400x400
 * png_max_size = 1366*768
 * @endcode
68
69
70
71
72
73
 */

const double PNGIO::plugin_nodata = -999.; //plugin specific nodata value. It can also be read by the plugin (depending on what is appropriate)

PNGIO::PNGIO(void (*delObj)(void*), const Config& i_cfg) : IOInterface(delObj), cfg(i_cfg)
{
74
	setOptions();
75
76
77
78
}

PNGIO::PNGIO(const std::string& configfile) : IOInterface(NULL), cfg(configfile)
{
79
	setOptions();
80
81
82
83
}

PNGIO::PNGIO(const Config& cfgreader) : IOInterface(NULL), cfg(cfgreader)
{
84
85
86
87
88
	setOptions();
}

void PNGIO::setOptions()
{
89
90
91
92
	cfg.getValue("COORDSYS", "Output", coordout);
	cfg.getValue("COORDPARAM", "Output", coordoutparam, Config::nothrow);
	//cfg.getValue("TIME_ZONE", "Output", tz_out, Config::nothrow);

93
94
95
96
97
98
99
	//get size specifications
	std::string min_size, max_size;
	min_w = min_h = max_w = max_h = IOUtils::unodata;
	cfg.getValue("png_min_size", "Output", min_size, Config::nothrow);
	if(min_size!="") parse_size(min_size, min_w, min_h);
	cfg.getValue("png_max_size", "Output", max_size, Config::nothrow);
	if(max_size!="") parse_size(max_size, max_w, max_h);
100

101
102
103
104
	autoscale = true;
	cfg.getValue("png_autoscale", "Output", autoscale, Config::nothrow);
	has_legend = true;
	cfg.getValue("png_legend", "Output", has_legend, Config::nothrow);
105
106
	scaling = "bilinear";
	cfg.getValue("png_scaling", "Output", scaling, Config::nothrow);
107
108
	has_world_file=false;
	cfg.getValue("png_world_file", "Output", has_world_file, Config::nothrow);
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146

	if(has_legend) { //we need to save room for the legend
		if(min_w!=IOUtils::unodata) min_w -= legend::getLegendWidth();
		if(max_w!=IOUtils::unodata) max_w -= legend::getLegendWidth();
	}
}

void PNGIO::parse_size(const std::string& size_spec, unsigned int& width, unsigned int& height)
{
	char rest[32] = "";
	if(sscanf(size_spec.c_str(), "%u %u%31s", &width, &height, rest) < 2)
	if(sscanf(size_spec.c_str(), "%u*%u%31s", &width, &height, rest) < 2)
	if(sscanf(size_spec.c_str(), "%ux%u%31s", &width, &height, rest) < 2) {
		std::stringstream ss;
		ss << "Can not parse PNGIO size specification \"" << size_spec << "\"";
		throw InvalidFormatException(ss.str(), AT);
	}
	std::string tmp(rest);
	IOUtils::trim(tmp);
	if ((tmp.length() > 0) && tmp[0] != '#' && tmp[0] != ';') {//if line holds more than one value it's invalid
		std::stringstream ss;
		ss << "Invalid PNGIO size specification \"" << size_spec << "\"";
		throw InvalidFormatException(ss.str(), AT);
	}
}

double PNGIO::getScaleFactor(const double& grid_w, const double& grid_h)
{
	if(grid_w==0 || grid_h==0) {
		return 1.;
	}

	double min_factor = IOUtils::nodata;
	if(min_w!=IOUtils::unodata) { //min_w & min_w are read together
		const double min_w_factor = (double)min_w / (double)grid_w;
		const double min_h_factor = (double)min_h / (double)grid_h;
		min_factor = std::max(min_w_factor, min_h_factor);
	}
147

148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
	double max_factor = IOUtils::nodata;
	if(max_w!=IOUtils::unodata) { //max_w & max_h are read together
		const double max_w_factor = (double)max_w / (double)grid_w;
		const double max_h_factor = (double)max_h / (double)grid_h;
		max_factor = std::min(max_w_factor, max_h_factor);
	}

	if(min_factor==IOUtils::nodata && max_factor==IOUtils::nodata)
		return 1.; //no user given specification
	if(min_factor!=IOUtils::nodata && max_factor!=IOUtils::nodata)
		return (min_factor+max_factor)/2.; //both min & max -> average

	//only one size specification provided -> return its matching factor
	if(min_factor!=IOUtils::nodata)
		return min_factor;
	else
		return max_factor;
165
166
167
168
169
170
171
}

PNGIO::~PNGIO() throw()
{

}

172
173
174
175
176
177
178
void PNGIO::read2DGrid(Grid2DObject&, const std::string&)
{
	//Nothing so far
	throw IOException("Nothing implemented here", AT);
}

void PNGIO::read2DGrid(Grid2DObject&, const MeteoGrids::Parameters& , const Date&)
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
{
	//Nothing so far
	throw IOException("Nothing implemented here", AT);
}

void PNGIO::readDEM(DEMObject& /*dem_out*/)
{
	//Nothing so far
	throw IOException("Nothing implemented here", AT);
}

void PNGIO::readLanduse(Grid2DObject& /*landuse_out*/)
{
	//Nothing so far
	throw IOException("Nothing implemented here", AT);
}

void PNGIO::readAssimilationData(const Date& /*date_in*/, Grid2DObject& /*da_out*/)
{
	//Nothing so far
	throw IOException("Nothing implemented here", AT);
}

void PNGIO::readStationData(const Date&, std::vector<StationData>& /*vecStation*/)
{
	//Nothing so far
	throw IOException("Nothing implemented here", AT);
}

void PNGIO::readMeteoData(const Date& /*dateStart*/, const Date& /*dateEnd*/,
                             std::vector< std::vector<MeteoData> >& /*vecMeteo*/,
                             const size_t&)
{
	//Nothing so far
	throw IOException("Nothing implemented here", AT);
}

void PNGIO::writeMeteoData(const std::vector< std::vector<MeteoData> >& /*vecMeteo*/,
                              const std::string&)
{
	//Nothing so far
	throw IOException("Nothing implemented here", AT);
}

void PNGIO::readSpecialPoints(std::vector<Coords>&)
{
	//Nothing so far
	throw IOException("Nothing implemented here", AT);
}

229
230
Grid2DObject PNGIO::scaleGrid(const Grid2DObject& grid_in)
{ //scale input image
231
	const double factor = getScaleFactor(grid_in.ncols, grid_in.nrows);
232
	if(scaling=="nearest")
233
		return ResamplingAlgorithms2D::NearestNeighbour(grid_in, factor);
234
	else if(scaling=="bilinear")
235
		return ResamplingAlgorithms2D::BilinearResampling(grid_in, factor);
236
237
238
239
240
	else {
		stringstream ss;
		ss << "Grid scaling algorithm \"" << scaling << "\" unknown";
		throw UnknownValueException(ss.str(), AT);
	}
241
}
242

243
244
void PNGIO::setFile(const std::string& filename, FILE *fp, png_structp& png_ptr, png_infop& info_ptr, const unsigned int &width, const unsigned int &height)
{
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
	// Open file for writing (binary mode)
	if (!IOUtils::validFileName(filename)) {
		throw InvalidFileNameException(filename, AT);
	}
	fp = fopen(filename.c_str(), "wb");
	if (fp == NULL) {
		throw FileAccessException(filename, AT);
	}

	// Initialize write structure
	png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
	if (png_ptr == NULL) {
		fclose(fp);
		throw IOException("Could not allocate write structure", AT);
	}

	// Initialize info structure
	info_ptr = png_create_info_struct(png_ptr);
	if (info_ptr == NULL) {
		fclose(fp);
		png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
		throw IOException("Could not allocate info structure", AT);
	}

	// Setup Exception handling
	if (setjmp(png_jmpbuf(png_ptr))) {
271
		cleanup(fp, png_ptr, info_ptr);
272
273
274
275
276
		throw IOException("Error during png creation", AT);
	}

	png_init_io(png_ptr, fp);

277
278
279
280
281
282
283
284
	// Write header (8 bit colour depth)
	png_set_IHDR(png_ptr, info_ptr, width, height,
	             8, PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
	             PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
}

unsigned int PNGIO::setLegend(const unsigned int &ncols, const unsigned int &nrows, const double &min, const double &max, Array2D<double> &legend_array)
{
285
286
287
288
289
	if(has_legend) {
		legend leg(nrows, min, max);
		legend_array = leg.getLegend();
		unsigned int nx, ny;
		legend_array.size(nx,ny);
290
291
292
		return (ncols+nx);
	} else {
		return ncols;
293
	}
294
295
296
297
298
}

void PNGIO::writeDataSection(const Grid2DObject &grid, const Array2D<double> &legend_array, const Gradient &gradient, const unsigned int &full_width, png_structp &png_ptr)
{
	const double ncols = grid.ncols, nrows = grid.nrows;
299
300

	// Allocate memory for one row (4 bytes per pixel - RGBA)
301
	png_bytep row=NULL;
302
	row = (png_bytep) malloc(4 * full_width * sizeof(png_byte));
303
304

	// Write image data
305
	for(int y=nrows-1 ; y>=0 ; y--) {
306
307
		//unsigned int x=0;
		for(unsigned int x=0; x<ncols ; x++) {
308
309
310
311
			const unsigned int i=x*4;
			unsigned char r,g,b,a;
			gradient.getColor(grid(x,y), r,g,b,a);
			row[i]=r; row[i+1]=g; row[i+2]=b; row[i+3]=a;
312
313
		}
		for(unsigned int x=ncols; x<full_width; x++) {
314
315
316
317
			const unsigned int i=x*4;
			unsigned char r,g,b,a;
			gradient.getColor(legend_array(x-ncols,y), r,g,b,a);
			row[i]=r; row[i+1]=g; row[i+2]=b; row[i+3]=a;
318
319
320
321
		}
		png_write_row(png_ptr, row);
	}

322
	free(row);
323
324
}

325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
void PNGIO::writeWorldFile(const Grid2DObject& grid_in, const std::string& filename)
{
	const string world_file = IOUtils::removeExtension(filename)+".pnw";
	const double cellsize = grid_in.cellsize;
	Coords world_ref=grid_in.llcorner;
	world_ref.setProj(coordout, coordoutparam);
	world_ref.moveByXY(0., grid_in.nrows*cellsize);

	std::ofstream fout;
	fout.open(world_file.c_str());
	if (fout.fail()) {
		throw FileAccessException(world_file, AT);
	}

	try {
		fout << std::setprecision(12) << cellsize << "\n";
		fout << "0.000000000000\n";
		fout << "0.000000000000\n";
		fout << std::setprecision(12) << -cellsize << "\n";
		fout << std::setprecision(12) << world_ref.getEasting() << "\n";
		fout << std::setprecision(12) << world_ref.getNorthing() << "\n";
	} catch(...) {
		fout.close();
		throw FileAccessException("Failed when writing to PNG world file \""+world_file+"\"", AT);
	}

	fout.close();
}

354
void PNGIO::write2DGrid(const Grid2DObject& grid_in, const std::string& filename)
355
{
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
	FILE *fp=NULL;
	png_structp png_ptr=NULL;
	png_infop info_ptr=NULL;

	//scale input image
	const Grid2DObject grid = scaleGrid(grid_in);
	const double ncols = grid.ncols, nrows = grid.nrows;
	const double min = grid.grid2D.getMin();
	const double max = grid.grid2D.getMax();

	Gradient gradient(Gradient::heat, min, max, autoscale);

	Array2D<double> legend_array; //it will remain empty if there is no legend
	const unsigned int full_width = setLegend(ncols, nrows, min, max, legend_array);

	setFile(filename, fp, png_ptr, info_ptr, full_width, nrows);
372
	if(has_world_file) writeWorldFile(grid, filename);
373
374
375
376
377
378
379
380
381
382

	createMetadata(grid);
	metadata_key.push_back("Title"); //adding generic title
	metadata_text.push_back("Unknown Gridded data");
	writeMetadata(png_ptr, info_ptr);

	writeDataSection(grid, legend_array, gradient, full_width, png_ptr);

	png_write_end(png_ptr, NULL);
	cleanup(fp, png_ptr, info_ptr);
383
384
}

385
void PNGIO::write2DGrid(const Grid2DObject& grid_in, const MeteoGrids::Parameters& parameter, const Date& date)
386
{
387
388
389
390
391
	std::string filename;
	if(parameter==MeteoGrids::DEM || parameter==MeteoGrids::SLOPE || parameter==MeteoGrids::AZI)
		filename = MeteoGrids::getParameterName(parameter) + ".png";
	else
		filename = date.toString(Date::NUM) + "_" + MeteoGrids::getParameterName(parameter) + ".png";
392

393
394
395
396
397
398
399
400
401
402
403
404
	FILE *fp=NULL;
	png_structp png_ptr=NULL;
	png_infop info_ptr=NULL;

	//scale input image
	Grid2DObject grid = scaleGrid(grid_in);
	const double ncols = grid.ncols, nrows = grid.nrows;
	double min = grid.grid2D.getMin();
	double max = grid.grid2D.getMax();

	Gradient gradient;
	if(parameter==MeteoGrids::DEM) {
405
406
407
408
409
410
		if(!autoscale) {
			min = 0.; //we want a 3000 snow line with a full scale legend
			gradient.set(Gradient::terrain, min, 3000., autoscale); //max used as snow line reference
			max = 4000.;
		} else
			gradient.set(Gradient::terrain, min, max, autoscale);
411
412
413
	} else if(parameter==MeteoGrids::SLOPE) {
		gradient.set(Gradient::slope, min, max, autoscale);
	} else if(parameter==MeteoGrids::AZI) {
414
415
416
417
		if(!autoscale) {
			min = 0.;
			max = 360.;
		}
418
419
		gradient.set(Gradient::azi, min, max, autoscale);
	} else if(parameter==MeteoGrids::HS) {
420
421
422
423
		if(!autoscale) {
			min = 0.; max = 3.5;
		}
		gradient.set(Gradient::blue, min, max, autoscale);
424
425
	} else if(parameter==MeteoGrids::TA) {
		grid.grid2D -= Cst::t_water_freezing_pt; //convert to celsius
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
		if(!autoscale) {
			min = -10.; max = 10.;
		} else {
			min -= Cst::t_water_freezing_pt;
			max -= Cst::t_water_freezing_pt;
		}
		gradient.set(Gradient::freeze, min, max, autoscale);
	} else if(parameter==MeteoGrids::TSS) {
		grid.grid2D -= Cst::t_water_freezing_pt; //convert to celsius
		if(!autoscale) {
			min = -10.; max = 10.;
		} else {
			min -= Cst::t_water_freezing_pt;
			max -= Cst::t_water_freezing_pt;
		}
		gradient.set(Gradient::freeze, min, max, autoscale);
442
	} else if(parameter==MeteoGrids::RH) {
443
444
445
446
		if(!autoscale) {
			min = 0.; max = 1.;
		}
		gradient.set(Gradient::blue_pink, min, max, autoscale);
447
	} else if(parameter==MeteoGrids::SWE) {
448
449
450
451
		if(!autoscale) {
			min = 0.; max = 2000.;
		}
		gradient.set(Gradient::blue, min, max, autoscale);
452
453
454
455
456
	} else {
		gradient.set(Gradient::heat, min, max, autoscale);
	}

	Array2D<double> legend_array; //it will remain empty if there is no legend
457
	const unsigned int full_width = setLegend(ncols, nrows, min, max, legend_array);
458
459

	setFile(filename, fp, png_ptr, info_ptr, full_width, nrows);
460
	if(has_world_file) writeWorldFile(grid, filename);
461
462
463
464

	createMetadata(grid);
	metadata_key.push_back("Title"); //adding title
	metadata_text.push_back( MeteoGrids::getParameterName(parameter)+" on "+date.toString(Date::ISO) );
465
466
	metadata_key.push_back("Simulation Date");
	metadata_text.push_back( date.toString(Date::ISO) );
467
468
	metadata_key.push_back("Simulation Parameter");
	metadata_text.push_back( MeteoGrids::getParameterName(parameter) );
469
470
471
472
473
474
	writeMetadata(png_ptr, info_ptr);

	writeDataSection(grid, legend_array, gradient, full_width, png_ptr);

	png_write_end(png_ptr, NULL);
	cleanup(fp, png_ptr, info_ptr);
475
476
}

477
void PNGIO::createMetadata(const Grid2DObject& grid)
478
{
479
480
481
482
	const double lat = grid.llcorner.getLat();
	const double lon = grid.llcorner.getLon();
	stringstream ss;

483
484
485
486
	metadata_key.push_back("Creation Time");
	Date cr_date;
	cr_date.setFromSys();
	metadata_text.push_back( cr_date.toString(Date::ISO) );
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
	metadata_key.push_back("Author");
	metadata_text.push_back(IOUtils::getLogName());
	metadata_key.push_back("Software");
	metadata_text.push_back("MeteoIO "+getLibVersion());
	metadata_key.push_back("Position");
	metadata_text.push_back("llcorner");
	metadata_key.push_back("Cellsize");
	ss.str(""); ss << fixed << setprecision(2) << grid.cellsize;
	metadata_text.push_back(ss.str());
	metadata_key.push_back("Latitude");
	ss.str(""); ss << fixed << setprecision(6) << lat;
	metadata_text.push_back(ss.str());
	metadata_key.push_back("Longitude");
	ss.str(""); ss << fixed << setprecision(6) << lon;
	metadata_text.push_back(ss.str());
502

503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
	if(lat<0.) {
		metadata_key.push_back("LatitudeRef");
		metadata_text.push_back("S");
		metadata_key.push_back("GPSLatitude");
		metadata_text.push_back(decimal_to_dms(-lat));
	} else {
		metadata_key.push_back("LatitudeRef");
		metadata_text.push_back("N");
		metadata_key.push_back("GPSLatitude");
		metadata_text.push_back(decimal_to_dms(lat));
	}
	if(lon<0.) {
		metadata_key.push_back("LongitudeRef");
		metadata_text.push_back("W");
		metadata_key.push_back("GPSLongitude");
		metadata_text.push_back(decimal_to_dms(-lon));
	} else {
		metadata_key.push_back("LongitudeRef");
		metadata_text.push_back("E");
		metadata_key.push_back("GPSLongitude");
		metadata_text.push_back(decimal_to_dms(lon));
	}
525

526
	//add data set timestamp
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
}

void PNGIO::writeMetadata(png_structp &png_ptr, png_infop &info_ptr)
{
	const size_t nr = metadata_key.size();
	png_text *info_text;
	info_text = (png_text *)calloc(sizeof(png_text), nr);
	char **key, **text;
	key = (char**)calloc(sizeof(char)*80, nr);
	text = (char**)calloc(sizeof(char)*80, nr);

	for(size_t ii=0; ii<nr; ii++) {
		key[ii] = (char *)calloc(sizeof(char), 80);
		text[ii] = (char *)calloc(sizeof(char), 80);
		strncpy(key[ii], metadata_key[ii].c_str(), 80);
		strncpy(text[ii], metadata_text[ii].c_str(), 80);
		info_text[ii].key = key[ii];
		info_text[ii].text = text[ii];
		info_text[ii].compression = PNG_TEXT_COMPRESSION_NONE;
	}
547

548
549
550
551
552
553
554
555
	png_set_text(png_ptr, info_ptr, info_text, nr);
	free(info_text);
	for(size_t ii=0; ii<nr; ii++) {
		free(key[ii]);
		free(text[ii]);
	}
	free(key);
	free(text);
556
557

	png_write_info(png_ptr, info_ptr);
558
559
560
561
562
563
564
565
566
567
}

std::string PNGIO::decimal_to_dms(const double& decimal) {
	std::stringstream dms;
	const int d = static_cast<int>( floor(decimal) );
	const double m = floor( ((decimal - (double)d)*60.)*100. ) / 100.;
	const double s = 3600.*(decimal - (double)d) - 60.*m;

	dms << d << "/1 " << static_cast<int>(m*100) << "/100 " << fixed << setprecision(6) << s << "/1";
	return dms.str();
568
569
}

570
void PNGIO::cleanup(FILE *fp, png_structp png_ptr, png_infop info_ptr)
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
{
	if (fp != NULL) fclose(fp);
	if (info_ptr != NULL) png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
	if (png_ptr != NULL) png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
}

#ifndef _METEOIO_JNI
extern "C"
{
#define COMPILE_PLUGIN
#include "exports.h"

	METEOIO_EXPORT void deleteObject(void* obj) {
		delete reinterpret_cast<PluginObject*>(obj);
	}

	METEOIO_EXPORT void* loadObject(const string& classname, const Config& cfg) {
		if(classname == "PNGIO") {
			//cerr << "Creating dynamic handle for " << classname << endl;
			return new PNGIO(deleteObject, cfg);
		}
		//cerr << "Could not load " << classname << endl;
		return NULL;
	}
}
#endif

} //namespace