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// Gmsh - Copyright (C) 1997-2020 C. Geuzaine, J.-F. Remacle
//
// See the LICENSE.txt file for license information. Please report all
// issues on https://gitlab.onelab.info/gmsh/gmsh/issues.
#include <string.h>
#include "ReadImg.h"
#include "GmshMessage.h"
#include "PView.h"
#include "PViewDataList.h"
#include "GmshConfig.h"
#if defined(HAVE_FLTK)
#include <FL/Fl_JPEG_Image.H>
#include <FL/Fl_PNM_Image.H>
#include <FL/Fl_PNG_Image.H>
#include <FL/Fl_BMP_Image.H>
// from an image, we create a post-procession view
static PViewDataList *Img2Data(Fl_RGB_Image &img_init, int quads = 1,
int resizex = 0, int resizey = 0)
{
img_init.desaturate(); // convert to grayscale
// resize if necessary
Fl_RGB_Image *img;
if(!resizex || !resizey)
img = (Fl_RGB_Image *)img_init.copy();
else
img = (Fl_RGB_Image *)img_init.copy(resizex, resizey);
const unsigned char *data = img->array;
int height = img->h();
int width = img->w();
int dim = img->d();
if(dim != 1 && dim != 2) {
Msg::Error("Unable to obtain one-channel image");
return 0;
}
PViewDataList *d = new PViewDataList();
double z = 0.;
for(int i = 0; i < height - 1; i++) {
const unsigned char *a = data + i * width * dim;
const unsigned char *a1 = data + (i + 1) * width * dim;
double y = height - i - 1;
double y1 = height - i - 2;
for(int j = 0; j < width - 1; j++) {
double x = j;
double x1 = j + 1;
double val1 = (double)a[j * dim] / 255.;
double val2 = (double)a1[j * dim] / 255.;
double val3 = (double)a1[(j + 1) * dim] / 255.;
double val4 = (double)a[(j + 1) * dim] / 255.;
if(quads) { // generate quads
d->SQ.push_back(x);
d->SQ.push_back(x);
d->SQ.push_back(x1);
d->SQ.push_back(x1);
d->SQ.push_back(y);
d->SQ.push_back(y1);
d->SQ.push_back(y1);
d->SQ.push_back(y);
d->SQ.push_back(z);
d->SQ.push_back(z);
d->SQ.push_back(z);
d->SQ.push_back(z);
d->SQ.push_back(val1);
d->SQ.push_back(val2);
d->SQ.push_back(val3);
d->SQ.push_back(val4);
d->NbSQ++;
}
else { // generate triangles
d->ST.push_back(x);
d->ST.push_back(x);
d->ST.push_back(x1);
d->ST.push_back(y);
d->ST.push_back(y1);
d->ST.push_back(y1);
d->ST.push_back(z);
d->ST.push_back(z);
d->ST.push_back(z);
d->ST.push_back(val1);
d->ST.push_back(val2);
d->ST.push_back(val3);
d->NbST++;
d->ST.push_back(x);
d->ST.push_back(x1);
d->ST.push_back(x1);
d->ST.push_back(y);
d->ST.push_back(y1);
d->ST.push_back(y);
d->ST.push_back(z);
d->ST.push_back(z);
d->ST.push_back(z);
d->ST.push_back(val1);
d->ST.push_back(val3);
d->ST.push_back(val4);
d->NbST++;
}
}
}
delete img;
return d;
}
static int EndPos(const char *name, PViewData *d)
{
if(!d) return 0;
char name_pos[256], title[256];
strcpy(name_pos, name);
strcat(name_pos, ".pos");
int i;
for(i = strlen(name) - 1; i >= 0; i--) {
if(name[i] == '/' || name[i] == '\\') break;
}
if(i <= 0)
strcpy(title, name);
else
strcpy(title, &name[i + 1]);
d->setName(title);
d->setFileName(name_pos);
if(d->finalize()) {
new PView(d);
return 1;
}
else {
delete d;
return 0;
}
}
int read_pnm(const std::string &fileName)
{
Fl_PNM_Image img(fileName.c_str());
return EndPos(fileName.c_str(), Img2Data(img));
}
int read_jpeg(const std::string &fileName)
{
Fl_JPEG_Image img(fileName.c_str());
return EndPos(fileName.c_str(), Img2Data(img));
}
int read_png(const std::string &fileName)
{
Fl_PNG_Image img(fileName.c_str());
return EndPos(fileName.c_str(), Img2Data(img));
}
int read_bmp(const std::string &fileName)
{
Fl_BMP_Image img(fileName.c_str());
return EndPos(fileName.c_str(), Img2Data(img));
}
#else
int read_pnm(std::string fileName) { return 0; }
int read_jpeg(std::string fileName) { return 0; }
int read_png(std::string fileName) { return 0; }
int read_bmp(std::string fileName) { return 0; }
#endif
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