1 /*****************************************************************************
5 ** Purpose: Imagefile classes
6 ** Programmer: Kevin Rosenberg
7 ** Date Started: June 2000
9 ** This is part of the CTSim program
10 ** Copyright (C) 1983-2000 Kevin Rosenberg
12 ** $Id: imagefile.cpp,v 1.26 2000/12/29 19:30:08 kevin Exp $
14 ** This program is free software; you can redistribute it and/or modify
15 ** it under the terms of the GNU General Public License (version 2) as
16 ** published by the Free Software Foundation.
18 ** This program is distributed in the hope that it will be useful,
19 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
20 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 ** GNU General Public License for more details.
23 ** You should have received a copy of the GNU General Public License
24 ** along with this program; if not, write to the Free Software
25 ** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 ******************************************************************************/
31 F32Image::F32Image (int nx, int ny, int dataType)
\r
32 : Array2dFile (nx, ny, sizeof(kfloat32), Array2dFile::PIXEL_FLOAT32, dataType)
\r
36 F32Image::F32Image (void)
\r
39 setPixelFormat (Array2dFile::PIXEL_FLOAT32);
\r
40 setPixelSize (sizeof(kfloat32));
\r
41 setDataType (Array2dFile::DATA_TYPE_REAL);
\r
44 F64Image::F64Image (int nx, int ny, int dataType)
\r
45 : Array2dFile (nx, ny, sizeof(kfloat64), Array2dFile::PIXEL_FLOAT64, dataType)
\r
49 F64Image::F64Image (void)
\r
52 setPixelFormat (PIXEL_FLOAT64);
\r
53 setPixelSize (sizeof(kfloat64));
\r
54 setDataType (Array2dFile::DATA_TYPE_REAL);
\r
58 ImageFile::filterResponse (const char* const domainName, double bw, const char* const filterName, double filt_param)
60 int hx = (m_nx - 1) / 2;
61 int hy = (m_ny - 1) / 2;
62 ImageFileArray v = getArray();
63 SignalFilter filter (filterName, domainName, bw, filt_param);
65 for (int i = -hx; i <= hx; i++) {
66 for (int j = -hy; j <= hy; j++) {
67 double r = ::sqrt (i * i + j * j);
69 v[i+hx][j+hy] = filter.response (r);
75 ImageFile::display (void) const
79 getMinMax (pmin, pmax);
81 return (displayScaling (1, pmin, pmax));
85 ImageFile::displayScaling (const int scale, const ImageFileValue pmin, const ImageFileValue pmax) const
89 ImageFileArrayConst v = getArray();
90 if (v == NULL || nx == 0 || ny == 0)
94 int* pPens = new int [nx * ny * scale * scale ];
96 double view_scale = 255 / (pmax - pmin);
97 int id_X11 = g2_open_X11 (nx * scale, ny * scale);
99 for (int i = 0; i < 256; i++) {
100 double cval = i / 255.;
101 grayscale[i] = g2_ink (id_X11, cval, cval, cval);
104 for (int iy = ny - 1; iy >= 0; iy--) {
105 int iRowPos = ((ny - 1 - iy) * scale) * (nx * scale);
106 for (int ix = 0; ix < nx; ix++) {
107 int cval = static_cast<int>((v[ix][iy] - pmin) * view_scale);
112 for (int sy = 0; sy < scale; sy++)
113 for (int sx = 0; sx < scale; sx++)
114 pPens[iRowPos+(sy * nx * scale)+(sx + (ix * scale))] = grayscale[cval];
118 g2_image (id_X11, 0., 0., nx * scale, ny * scale, pPens);
129 // ImageFile::comparativeStatistics Calculate comparative stats
132 // d Normalized root mean squared distance measure
133 // r Normalized mean absolute distance measure
134 // e Worst case distance measure
137 // G.T. Herman, Image Reconstruction From Projections, 1980
140 ImageFile::comparativeStatistics (const ImageFile& imComp, double& d, double& r, double& e) const
142 if (imComp.nx() != m_nx && imComp.ny() != m_ny) {
143 sys_error (ERR_WARNING, "Image sizes differ [ImageFile::comparativeStatistics]");
146 ImageFileArrayConst v = getArray();
147 if (v == NULL || m_nx == 0 || m_ny == 0)
150 ImageFileArrayConst vComp = imComp.getArray();
153 for (unsigned int ix = 0; ix < m_nx; ix++) {
154 for (unsigned int iy = 0; iy < m_ny; iy++) {
158 myMean /= (m_nx * m_ny);
160 double sqErrorSum = 0.;
161 double absErrorSum = 0.;
162 double sqDiffFromMeanSum = 0.;
163 double absValueSum = 0.;
164 for (unsigned int ix2 = 0; ix2 < m_nx; ix2++) {
165 for (unsigned int iy = 0; iy < m_ny; iy++) {
166 double diff = v[ix2][iy] - vComp[ix2][iy];
167 sqErrorSum += diff * diff;
168 absErrorSum += fabs(diff);
169 double diffFromMean = v[ix2][iy] - myMean;
170 sqDiffFromMeanSum += diffFromMean * diffFromMean;
171 absValueSum += fabs(v[ix2][iy]);
175 d = ::sqrt (sqErrorSum / sqDiffFromMeanSum);
176 r = absErrorSum / absValueSum;
181 for (int ix3 = 0; ix3 < hx; ix3++) {
182 for (int iy = 0; iy < hy; iy++) {
183 double avgPixel = 0.25 * (v[2*ix3][2*iy] + v[2*ix3+1][2*iy] + v[2*ix3][2*iy+1] + v[2*ix3+1][2*iy+1]);
184 double avgPixelComp = 0.25 * (vComp[2*ix3][2*iy] + vComp[2*ix3+1][2*iy] + vComp[2*ix3][2*iy+1] + vComp[2*ix3+1][2*iy+1]);
185 double error = fabs (avgPixel - avgPixelComp);
198 ImageFile::printComparativeStatistics (const ImageFile& imComp, std::ostream& os) const
202 if (comparativeStatistics (imComp, d, r, e)) {
203 os << " Normalized root mean squared distance (d): " << d << std::endl;
204 os << " Normalized mean absolute distance (r): " << r << std::endl;
205 os << "Worst case distance (2x2 pixel average) (e): " << e << std::endl;
213 ImageFile::printStatistics (std::ostream& os) const
215 double min, max, mean, mode, median, stddev;
217 statistics (min, max, mean, mode, median, stddev);
\r
218 if (dataType() == Array2dFile::DATA_TYPE_COMPLEX)
\r
219 os << "Real Component Statistics" << std::endl;
\r
221 os << " min: " << min << std::endl;
222 os << " max: " << max << std::endl;
223 os << " mean: " << mean << std::endl;
224 os << " mode: " << mode << std::endl;
225 os << "median: " << median << std::endl;
226 os << "stddev: " << stddev << std::endl;
\r
228 if (dataType() == Array2dFile::DATA_TYPE_COMPLEX) {
\r
229 statistics (getImaginaryArray(), min, max, mean, mode, median, stddev);
\r
230 os << std::endl << "Imaginary Component Statistics" << std::endl;
231 os << " min: " << min << std::endl;
\r
232 os << " max: " << max << std::endl;
\r
233 os << " mean: " << mean << std::endl;
\r
234 os << " mode: " << mode << std::endl;
\r
235 os << "median: " << median << std::endl;
\r
236 os << "stddev: " << stddev << std::endl;
\r
242 ImageFile::statistics (double& min, double& max, double& mean, double& mode, double& median, double& stddev) const
244 ImageFileArrayConst v = getArray();
\r
245 statistics (v, min, max, mean, mode, median, stddev);
\r
250 ImageFile::statistics (ImageFileArrayConst& v, double& min, double& max, double& mean, double& mode, double& median, double& stddev) const
\r
255 if (v == NULL || nx == 0 || ny == 0)
\r
258 std::vector<double> vecImage;
\r
260 vecImage.resize (nx * ny);
\r
261 for (int ix = 0; ix < nx; ix++) {
\r
262 for (int iy = 0; iy < ny; iy++)
\r
263 vecImage[iVec++] = v[ix][iy];
\r
266 vectorNumericStatistics (vecImage, nx * ny, min, max, mean, mode, median, stddev);
\r
270 ImageFile::getMinMax (double& min, double& max) const
274 ImageFileArrayConst v = getArray();
276 if (v == NULL || nx == 0 || ny == 0)
281 for (int ix = 0; ix < nx; ix++) {
282 for (int iy = 0; iy < ny; iy++) {
292 ImageFile::convertRealToComplex ()
\r
294 if (dataType() != Array2dFile::DATA_TYPE_REAL)
\r
297 if (! reallocRealToComplex())
\r
300 ImageFileArray vImag = getImaginaryArray();
\r
301 for (int ix = 0; ix < m_nx; ix++) {
\r
302 ImageFileColumn vCol = vImag[ix];
\r
303 for (int iy = 0; iy < m_ny; iy++)
\r
311 ImageFile::convertComplexToReal ()
\r
313 if (dataType() != Array2dFile::DATA_TYPE_COMPLEX)
\r
316 ImageFileArray vReal = getArray();
\r
317 ImageFileArray vImag = getImaginaryArray();
\r
318 for (int ix = 0; ix < m_nx; ix++) {
\r
319 ImageFileColumn vRealCol = vReal[ix];
\r
320 ImageFileColumn vImagCol = vImag[ix];
\r
321 for (int iy = 0; iy < m_ny; iy++) {
\r
322 std::complex<double> c (*vRealCol, *vImagCol);
\r
323 *vRealCol++ = std::abs (c);
\r
328 return reallocComplexToReal();
\r
332 ImageFile::subtractImages (const ImageFile& rRHS, ImageFile& result) const
\r
334 if (m_nx != rRHS.nx() || m_ny != rRHS.ny() || m_nx != result.nx() || m_ny != result.ny()) {
\r
335 sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::subtractImage]");
\r
339 ImageFileArrayConst vLHS = getArray();
\r
340 ImageFileArrayConst vRHS = rRHS.getArray();
\r
341 ImageFileArray vResult = result.getArray();
\r
343 for (int ix = 0; ix < m_nx; ix++) {
\r
344 ImageFileColumnConst in1 = vLHS[ix];
\r
345 ImageFileColumnConst in2 = vRHS[ix];
\r
346 ImageFileColumn out = vResult[ix];
\r
347 for (int iy = 0; iy < m_ny; iy++)
\r
348 *out++ = *in1++ - *in2++;
\r
355 ImageFile::addImages (const ImageFile& rRHS, ImageFile& result) const
\r
357 if (m_nx != rRHS.nx() || m_ny != rRHS.ny() || m_nx != result.nx() || m_ny != result.ny()) {
\r
358 sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::subtractImage]");
\r
362 ImageFileArrayConst vLHS = getArray();
\r
363 ImageFileArrayConst vRHS = rRHS.getArray();
\r
364 ImageFileArray vResult = result.getArray();
\r
366 for (int ix = 0; ix < m_nx; ix++) {
\r
367 ImageFileColumnConst in1 = vLHS[ix];
\r
368 ImageFileColumnConst in2 = vRHS[ix];
\r
369 ImageFileColumn out = vResult[ix];
\r
370 for (int iy = 0; iy < m_ny; iy++)
\r
371 *out++ = *in1++ + *in2++;
\r
378 ImageFile::multiplyImages (const ImageFile& rRHS, ImageFile& result) const
\r
380 if (m_nx != rRHS.nx() || m_ny != rRHS.ny() || m_nx != result.nx() || m_ny != result.ny()) {
\r
381 sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::subtractImage]");
\r
385 ImageFileArrayConst vLHS = getArray();
\r
386 ImageFileArrayConst vRHS = rRHS.getArray();
\r
387 ImageFileArray vResult = result.getArray();
\r
389 for (int ix = 0; ix < m_nx; ix++) {
\r
390 ImageFileColumnConst in1 = vLHS[ix];
\r
391 ImageFileColumnConst in2 = vRHS[ix];
\r
392 ImageFileColumn out = vResult[ix];
\r
393 for (int iy = 0; iy < m_ny; iy++)
\r
394 *out++ = *in1++ * *in2++;
\r
401 ImageFile::divideImages (const ImageFile& rRHS, ImageFile& result) const
\r
403 if (m_nx != rRHS.nx() || m_ny != rRHS.ny() || m_nx != result.nx() || m_ny != result.ny()) {
\r
404 sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::subtractImage]");
\r
408 ImageFileArrayConst vLHS = getArray();
\r
409 ImageFileArrayConst vRHS = rRHS.getArray();
\r
410 ImageFileArray vResult = result.getArray();
\r
412 for (int ix = 0; ix < m_nx; ix++) {
\r
413 ImageFileColumnConst in1 = vLHS[ix];
\r
414 ImageFileColumnConst in2 = vRHS[ix];
\r
415 ImageFileColumn out = vResult[ix];
\r
416 for (int iy = 0; iy < m_ny; iy++) {
\r
418 *out++ = *in1++ / *in2++;
\r
429 ImageFile::invertPixelValues (ImageFile& result) const
\r
431 if (m_nx != result.nx() || m_ny != result.ny()) {
\r
432 sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
\r
436 ImageFileArrayConst vLHS = getArray();
\r
437 ImageFileArray vResult = result.getArray();
\r
439 for (int ix = 0; ix < m_nx; ix++) {
\r
440 ImageFileColumnConst in = vLHS[ix];
\r
441 ImageFileColumn out = vResult[ix];
\r
442 for (int iy = 0; iy < m_ny; iy++)
\r
450 ImageFile::sqrt (ImageFile& result) const
\r
452 if (m_nx != result.nx() || m_ny != result.ny()) {
\r
453 sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
\r
457 ImageFileArrayConst vLHS = getArray();
\r
458 ImageFileArray vResult = result.getArray();
\r
460 for (int ix = 0; ix < m_nx; ix++) {
\r
461 ImageFileColumnConst in = vLHS[ix];
\r
462 ImageFileColumn out = vResult[ix];
\r
463 for (int iy = 0; iy < m_ny; iy++)
\r
465 *out++ = -::sqrt(-*in++);
\r
467 *out++ = ::sqrt(*in++);
\r
474 ImageFile::log (ImageFile& result) const
\r
476 if (m_nx != result.nx() || m_ny != result.ny()) {
\r
477 sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
\r
481 ImageFileArrayConst vLHS = getArray();
\r
482 ImageFileArray vResult = result.getArray();
\r
484 for (int ix = 0; ix < m_nx; ix++) {
\r
485 ImageFileColumnConst in = vLHS[ix];
\r
486 ImageFileColumn out = vResult[ix];
\r
487 for (int iy = 0; iy < m_ny; iy++)
\r
491 *out++ = ::log(*in++);
\r
498 ImageFile::exp (ImageFile& result) const
\r
500 if (m_nx != result.nx() || m_ny != result.ny()) {
\r
501 sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
\r
505 ImageFileArrayConst vLHS = getArray();
\r
506 ImageFileArray vResult = result.getArray();
\r
508 for (int ix = 0; ix < m_nx; ix++) {
\r
509 ImageFileColumnConst in = vLHS[ix];
\r
510 ImageFileColumn out = vResult[ix];
\r
511 for (int iy = 0; iy < m_ny; iy++)
\r
512 *out++ = ::exp (*in++);
\r
519 ImageFile::inverseFourier (ImageFile& result) const
\r
521 if (m_nx != result.nx() || m_ny != result.ny()) {
\r
522 sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
\r
530 ImageFile::fourier (ImageFile& result) const
\r
532 if (m_nx != result.nx() || m_ny != result.ny()) {
\r
533 sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
\r
537 if (result.dataType() == Array2dFile::DATA_TYPE_REAL) {
\r
538 if (! result.reallocRealToComplex ())
\r
542 ImageFileArrayConst vLHS = getArray();
\r
543 ImageFileArray vRealResult = result.getArray();
\r
544 ImageFileArray vImagResult = result.getImaginaryArray();
\r
547 double* pY = new double [m_ny];
\r
548 std::complex<double>** complexOut = new std::complex<double>* [m_nx];
\r
549 for (ix = 0; ix < m_nx; ix++)
\r
550 complexOut[ix] = new std::complex<double> [m_ny];
\r
552 for (ix = 0; ix < m_nx; ix++) {
\r
553 for (iy = 0; iy < m_ny; iy++)
\r
554 pY[iy] = vLHS[ix][iy];
\r
555 ProcessSignal::finiteFourierTransform (pY, complexOut[ix], m_ny, ProcessSignal::FORWARD);
\r
559 std::complex<double>* pX = new std::complex<double> [m_nx];
\r
560 std::complex<double>* complexOutCol = new std::complex<double> [m_nx];
\r
561 for (iy = 0; iy < m_ny; iy++) {
\r
562 for (ix = 0; ix < m_nx; ix++)
\r
563 pX[ix] = complexOut[ix][iy];
\r
564 ProcessSignal::finiteFourierTransform (pX, complexOutCol, m_nx, ProcessSignal::FORWARD);
\r
565 for (ix = 0; ix < m_nx; ix++)
\r
566 complexOut[ix][iy] = complexOutCol[ix];
\r
570 for (ix = 0; ix < m_nx; ix++)
\r
571 ProcessSignal::shuffleFourierToNaturalOrder (complexOut[ix], m_ny);
\r
574 for (iy = 0; iy < m_ny; iy++) {
\r
575 for (ix = 0; ix < m_nx; ix++)
\r
576 complexOutCol[ix] = complexOut[ix][iy];
\r
577 ProcessSignal::shuffleFourierToNaturalOrder (complexOutCol, m_nx);;
\r
578 for (ix = 0; ix < m_nx; ix++)
\r
579 complexOut[ix][iy] = complexOutCol[ix];
\r
582 delete [] complexOutCol;
\r
584 for (ix = 0; ix < m_nx; ix++)
\r
585 for (iy = 0; iy < m_ny; iy++) {
\r
586 vRealResult[ix][iy] = complexOut[ix][iy].real();
\r
587 vImagResult[ix][iy] = complexOut[ix][iy].imag();
\r
590 for (ix = 0; ix < m_nx; ix++)
\r
591 delete [] complexOut[ix];
\r
593 delete [] complexOut;
\r
599 ImageFile::magnitude (ImageFile& result) const
\r
601 if (m_nx != result.nx() || m_ny != result.ny()) {
\r
602 sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
\r
606 ImageFileArray vReal = getArray();
\r
607 ImageFileArray vImag = NULL;
\r
608 if (dataType() == Array2dFile::DATA_TYPE_COMPLEX)
\r
609 vImag = getImaginaryArray();
\r
611 ImageFileArray vRealResult = result.getArray();
\r
612 if (result.dataType() == Array2dFile::DATA_TYPE_COMPLEX) {
\r
613 ImageFileArray vImagResult = result.getImaginaryArray();
\r
614 for (int ix = 0; ix < m_nx; ix++)
\r
615 for (int iy = 0; iy < m_ny; iy++)
\r
616 vImagResult[ix][iy] = 0;
\r
619 for (int ix = 0; ix < m_nx; ix++)
\r
620 for (int iy = 0; iy < m_ny; iy++) {
\r
621 if (dataType() == Array2dFile::DATA_TYPE_COMPLEX)
\r
622 vRealResult[ix][iy] = ::sqrt (vReal[ix][iy] * vReal[ix][iy] + vImag[ix][iy] * vImag[ix][iy]);
\r
624 vRealResult[ix][iy] = vReal[ix][iy];
\r
631 ImageFile::phase (ImageFile& result) const
\r
633 if (m_nx != result.nx() || m_ny != result.ny()) {
\r
634 sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
\r
638 ImageFileArray vReal = getArray();
\r
639 ImageFileArray vImag = NULL;
\r
640 if (dataType() == Array2dFile::DATA_TYPE_COMPLEX)
\r
641 vImag = getImaginaryArray();
\r
643 ImageFileArray vRealResult = result.getArray();
\r
644 if (result.dataType() == Array2dFile::DATA_TYPE_COMPLEX) {
\r
645 ImageFileArray vImagResult = result.getImaginaryArray();
\r
646 for (int ix = 0; ix < m_nx; ix++)
\r
647 for (int iy = 0; iy < m_ny; iy++)
\r
648 vImagResult[ix][iy] = 0;
\r
651 for (int ix = 0; ix < m_nx; ix++)
\r
652 for (int iy = 0; iy < m_ny; iy++) {
\r
653 if (dataType() == Array2dFile::DATA_TYPE_COMPLEX)
\r
654 vRealResult[ix][iy] = ::atan (vImag[ix][iy] / vReal[ix][iy]);
\r
656 vRealResult[ix][iy] = vReal[ix][iy];
\r
663 ImageFile::square (ImageFile& result) const
\r
665 if (m_nx != result.nx() || m_ny != result.ny()) {
\r
666 sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
\r
670 ImageFileArrayConst vLHS = getArray();
\r
671 ImageFileArray vResult = result.getArray();
\r
673 for (int ix = 0; ix < m_nx; ix++) {
\r
674 ImageFileColumnConst in = vLHS[ix];
\r
675 ImageFileColumn out = vResult[ix];
\r
676 for (int iy = 0; iy < m_ny; iy++) {
\r
677 *out++ = *in * *in;
\r
687 ImageFile::writeImagePGM (const char *outfile, int nxcell, int nycell, double densmin, double densmax)
692 ImageFileArray v = getArray();
694 unsigned char* rowp = new unsigned char [nx * nxcell];
696 if ((fp = fopen (outfile, "wb")) == NULL)
700 fprintf(fp, "%d %d\n", nx, ny);
701 fprintf(fp, "255\n");
703 for (int irow = ny - 1; irow >= 0; irow--) {
704 for (int icol = 0; icol < nx; icol++) {
705 int pos = icol * nxcell;
706 double dens = (v[icol][irow] - densmin) / (densmax - densmin);
707 dens = clamp (dens, 0., 1.);
708 for (int p = pos; p < pos + nxcell; p++) {
709 rowp[p] = static_cast<unsigned int> (dens * 255.);
712 for (int ir = 0; ir < nycell; ir++) {
713 for (int ic = 0; ic < nx * nxcell; ic++)
714 fputc( rowp[ic], fp );
723 ImageFile::writeImagePGMASCII (const char *outfile, int nxcell, int nycell, double densmin, double densmax)
728 ImageFileArray v = getArray();
730 unsigned char* rowp = new unsigned char [nx * nxcell];
732 if ((fp = fopen (outfile, "wb")) == NULL)
736 fprintf(fp, "%d %d\n", nx, ny);
737 fprintf(fp, "255\n");
739 for (int irow = ny - 1; irow >= 0; irow--) {
740 for (int icol = 0; icol < nx; icol++) {
741 int pos = icol * nxcell;
742 double dens = (v[icol][irow] - densmin) / (densmax - densmin);
743 dens = clamp (dens, 0., 1.);
744 for (int p = pos; p < pos + nxcell; p++) {
745 rowp[p] = static_cast<unsigned int> (dens * 255.);
748 for (int ir = 0; ir < nycell; ir++) {
749 for (int ic = 0; ic < nx * nxcell; ic++)
750 fprintf(fp, "%d ", rowp[ic]);
762 ImageFile::writeImagePNG (const char *outfile, int bitdepth, int nxcell, int nycell, double densmin, double densmax)
767 double max_out_level = (1 << bitdepth) - 1;
770 ImageFileArray v = getArray();
772 unsigned char* rowp = new unsigned char [nx * nxcell * (bitdepth / 8)];
774 if ((fp = fopen (outfile, "wb")) == NULL)
777 png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
781 info_ptr = png_create_info_struct(png_ptr);
783 png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
788 if (setjmp(png_ptr->jmpbuf)) {
789 png_destroy_write_struct(&png_ptr, &info_ptr);
794 png_init_io(png_ptr, fp);
796 png_set_IHDR(png_ptr, info_ptr, nx * nxcell, ny * nycell, bitdepth, PNG_COLOR_TYPE_GRAY, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_DEFAULT);
798 png_write_info(png_ptr, info_ptr);
799 for (int irow = ny - 1; irow >= 0; irow--) {
800 png_bytep row_pointer = rowp;
802 for (int icol = 0; icol < nx; icol++) {
803 int pos = icol * nxcell;
804 double dens = (v[icol][irow] - densmin) / (densmax - densmin);
805 dens = clamp (dens, 0., 1.);
806 unsigned int outval = static_cast<unsigned int> (dens * max_out_level);
808 for (int p = pos; p < pos + nxcell; p++) {
813 rowp[rowpos] = (outval >> 8) & 0xFF;
814 rowp[rowpos+1] = (outval & 0xFF);
818 for (int ir = 0; ir < nycell; ir++)
819 png_write_rows (png_ptr, &row_pointer, 1);
822 png_write_end(png_ptr, info_ptr);
823 png_destroy_write_struct(&png_ptr, &info_ptr);
832 static const int N_GRAYSCALE=256;
835 ImageFile::writeImageGIF (const char *outfile, int nxcell, int nycell, double densmin, double densmax)
839 int gs_indices[N_GRAYSCALE];
842 ImageFileArray v = getArray();
844 unsigned char rowp [nx * nxcell];
848 gif = gdImageCreate(nx * nxcell, ny * nycell);
849 for (int i = 0; i < N_GRAYSCALE; i++)
850 gs_indices[i] = gdImageColorAllocate(gif, i, i, i);
852 int lastrow = ny * nycell - 1;
853 for (int irow = 0; irow < ny; irow++) {
854 int rpos = irow * nycell;
855 for (int ir = rpos; ir < rpos + nycell; ir++) {
856 for (int icol = 0; icol < nx; icol++) {
857 int cpos = icol * nxcell;
858 double dens = (v[icol][irow] - densmin) / (densmax - densmin);
859 dens = clamp(dens, 0., 1.);
860 for (int ic = cpos; ic < cpos + nxcell; ic++) {
861 rowp[ic] = (unsigned int) (dens * (double) (N_GRAYSCALE - 1));
862 gdImageSetPixel(gif, ic, lastrow - ir, gs_indices[rowp[ic]]);
868 if ((out = fopen(outfile,"w")) == NULL) {
869 sys_error(ERR_FATAL, "Error opening output file %s for writing", outfile);