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/***************************************************************************
* data_png.cpp is part of Math Graphic Library
* Copyright (C) 2007-2016 Alexey Balakin <mathgl.abalakin@gmail.ru> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Library General Public License as *
* published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* This program 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 General Public License for more details. *
* *
* You should have received a copy of the GNU Library General Public *
* License along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include "mgl2/base.h"
#include "mgl2/data.h"
#if MGL_HAVE_PNG
#include <png.h>
#endif
#if MGL_HAVE_JPEG
#include <jpeglib.h>
#endif
//-----------------------------------------------------------------------------
unsigned MGL_LOCAL_PURE mgl_col_dif(unsigned char *c1,unsigned char *c2)
{
unsigned d1=abs(int(c1[0])-c2[0]), d2=abs(int(c1[1])-c2[1]), d3=abs(int(c1[2])-c2[2]);
d2 = d2>d3?d2:d3; d2 = d2>d1?d2:d1; return d2;
}
//-----------------------------------------------------------------------------
MGL_NO_EXPORT unsigned char *mgl_create_scheme(const char *scheme,long &num)
{
unsigned char *c=0,*cc=new unsigned char[3*strlen(scheme)+3],*c1,*c2;
size_t nc=1,np=0,l=strlen(scheme);
mglColor col;
for(size_t i=0;i<l;i++)
{
col.Set(scheme[i]);
if(col.Valid())
{ cc[3*np]=255*col.r; cc[3*np+1]=255*col.g; cc[3*np+2]=255*col.b; np++; }
}
if(np<2) { num=0; delete []cc; return 0; }
for(size_t i=0;i<np-1;i++) nc+=mgl_col_dif(cc+3*i,cc+3*i+3);
c = new unsigned char[3*nc+3];
size_t pos=0;
for(size_t i=0;i<np-1;i++)
{
size_t dd=mgl_col_dif(cc+3*i,cc+3*i+3);
for(size_t j=0;j<dd;j++)
{
c1 = c+3*(pos+j); c2 = cc+3*i;
c1[0] = c2[0]+(c2[3]-c2[0])*j/dd;
c1[1] = c2[1]+(c2[4]-c2[1])*j/dd;
c1[2] = c2[2]+(c2[5]-c2[2])*j/dd;
}
pos += dd;
}
memcpy(c+3*nc-3,cc+3*np-3,3); delete []cc;
num=nc; return c;
}
//-----------------------------------------------------------------------------
bool MGL_NO_EXPORT mgl_read_image(unsigned char **g, int &w, int &h, const char *fname)
{
const char *ext = fname+strlen(fname)-1; // rindex(fname,'.');
while(*ext!='.' && ext!=fname) ext--;
if(!strcmp(ext,".png"))
{
#if MGL_HAVE_PNG
FILE *fp = fopen(fname, "rb");
if(!fp) return false;
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
if (!png_ptr) { fclose(fp); return false; }
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{ png_destroy_read_struct(&png_ptr,0,0); fclose(fp); return false; }
png_infop end_info = png_create_info_struct(png_ptr);
if (!end_info)
{ png_destroy_read_struct(&png_ptr,&info_ptr,0); fclose(fp); return false; }
png_init_io(png_ptr, fp);
png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_PACKING|PNG_TRANSFORM_STRIP_16|PNG_TRANSFORM_EXPAND,0);
unsigned char **rows = png_get_rows(png_ptr, info_ptr);
long wi=png_get_image_width(png_ptr, info_ptr);
long hi=png_get_image_height(png_ptr, info_ptr);
int type = png_get_color_type(png_ptr, info_ptr);
if(*g)
{
if(wi>w) wi = w;
if(hi>h) hi = h;
}
else { w = wi; h = hi; *g = new unsigned char[4*w*h]; }
if(type==PNG_COLOR_TYPE_RGB_ALPHA)
#pragma omp parallel for
for(long i=0;i<hi;i++) memcpy(*g+4*w*i,rows[i],4*wi);
else if(type==PNG_COLOR_TYPE_RGB)
#pragma omp parallel for collapse(2)
for(long i=0;i<hi;i++) for(long j=0;j<wi;j++)
memcpy(*g+4*(w*i+j),rows[i]+3*j,3);
else if(type==PNG_COLOR_TYPE_GRAY)
#pragma omp parallel for collapse(2)
for(long i=0;i<hi;i++) for(long j=0;j<wi;j++)
(*g)[4*(w*i+j)] = (*g)[4*(w*i+j)+1] = (*g)[4*(w*i+j)+2] = rows[i][j];
else if(type==PNG_COLOR_TYPE_GRAY_ALPHA)
#pragma omp parallel for collapse(2)
for(long i=0;i<hi;i++) for(long j=0;j<wi;j++)
{
(*g)[4*(w*i+j)] = (*g)[4*(w*i+j)+1] = (*g)[4*(w*i+j)+2] = rows[i][2*j];
(*g)[4*(w*i+j)+3] = rows[i][2*j+1];
}
png_destroy_read_struct(&png_ptr, &info_ptr,&end_info);
fclose(fp);
#else
mgl_set_global_warn(_("PNG support was disabled. Please, enable it and rebuild MathGL."));
#endif
}
else if(!strcmp(ext,".jpg") || !strcmp(ext,".jpeg"))
{
#if MGL_HAVE_JPEG
FILE *fp = fopen(fname, "rb");
if(!fp) return false;
jpeg_decompress_struct info;
jpeg_error_mgr err;
info.err = jpeg_std_error(&err);
jpeg_create_decompress(&info);
jpeg_stdio_src(&info, fp);
jpeg_read_header(&info, TRUE); // read jpeg file header
jpeg_start_decompress(&info); // decompress the file
long wi = info.output_width; //set width and height
long hi = info.output_height;
int channels = info.num_components; // == 4 for RGBA else for RGB
unsigned char *buf = new unsigned char[(channels==4?4:3)*wi];
if(*g)
{
if(hi>h) hi = h;
if(wi>w) wi = w;
}
else { w = wi; h = hi; *g = new unsigned char[4*w*h]; }
for(long i=0;i<hi;i++)
{
jpeg_read_scanlines(&info, &buf, 1);
if(channels==4)
memcpy(*g+4*i*w,buf,4*wi);
else
#pragma omp parallel for
for(long j=0;j<wi;j++)
memcpy(*g+4*i*w+4*j,buf+3*j,3);
}
delete []buf;
#else
mgl_set_global_warn(_("JPEG support was disabled. Please, enable it and rebuild MathGL."));
#endif
}
return true;
}
//-----------------------------------------------------------------------------
void MGL_EXPORT mgl_data_import(HMDT d, const char *fname, const char *scheme,mreal v1,mreal v2)
{
if(v1>=v2) return;
unsigned char *g = 0;
int w=0, h=0;
if(!mgl_read_image(&g,w,h,fname)) return;
#ifdef OLD_IMPORT
const mglTexture c(scheme,1);
if(c.n<2) return;
d->Create(w,h,1);
float *ll = new float[3*c.n-1];
mglColor *lc = new mglColor[c.n-1];
const mglColor *c0=c.c0;
for(long i=0;i<c.n-1;i++)
{
lc[i] = c.c0[2*i+2]-c.c0[2*i];
float tmp = lc[i]*lc[i];
ll[3*i] = tmp?1/tmp:0;
ll[3*i+1] = c.val[i];
ll[3*i+2] = c.val[i+1]-c.val[i];
}
#pragma omp parallel for collapse(2)
for(long i=0;i<h;i++) for(long j=0;j<w;j++)
{
mglColor cc(g+4*w*(d->ny-i-1)+4*j);
float pos=NAN, mval=256;
for(long k=0;k<c.n-1;k++)
{
mglColor tc(cc-c0[2*k]);
float u = (tc*lc[k])*ll[3*k]; tc -= lc[k]*u;
float v = tc*tc, u0=ll[3*k+1], du=ll[3*k+2];
if(v==0)
{
if(u>=0 && u<=1) { pos=u*du+u0;mval=0; break; }
// else if(u>-v && u<0){ pos=u0; mval=0; break; }
// else if(u<1+v) { pos=du+u0; mval=0; break; }
}
else if(v<mval)
{
if(u>=0 && u<=1) { pos=u*du+u0; mval=v; }
// else if(u>-v && u<0){ pos=u0; mval=v; }
// else if(u<1+v) { pos=du+u0; mval=v; }
}
}
long K=c.n-2;
float uF = (mglColor(cc-c0[0])*lc[0])*ll[0];
float uL = (mglColor(cc-c0[2*K])*lc[K])*ll[3*K];
if(mgl_isnan(pos) && uF<0) pos = 0;
if(mgl_isnan(pos) && uL>1) pos = 1;
d->a[j+d->nx*i] = v1 + pos*(v2-v1);
}
printf("\n");
delete []g; delete []ll; delete []lc;
#else
long num=0;
unsigned char *c = mgl_create_scheme(scheme,num);
if(num<2) return;
d->Create(w,h,1);
#pragma omp parallel for collapse(2)
for(long i=0;i<h;i++) for(long j=0;j<w;j++)
{
unsigned pos=0,mval=256*256;
const unsigned char *c2=g+4*w*(d->ny-i-1)+4*j;
for(long k=0;k<num;k++)
{
const unsigned char *c1=c+3*k;
int v0=int(c1[0])-c2[0];
int v1=int(c1[1])-c2[1];
int v2=int(c1[2])-c2[2];
unsigned val = v0*v0+v1*v1+v2*v2;
if(val==0) { pos=k; break; }
if(val<mval) { pos=k; mval=val; }
}
d->a[j+d->nx*i] = v1 + pos*(v2-v1)/(num-1);
}
delete []c; delete []g;
#endif
}
//-----------------------------------------------------------------------------
int MGL_NO_EXPORT mgl_png_save(const char *fname, int w, int h, unsigned char **p);
int MGL_NO_EXPORT mgl_bmp_save(const char *fname, int w, int h, unsigned char **p);
int MGL_NO_EXPORT mgl_tga_save(const char *fname, int w, int h, unsigned char **p);
int MGL_NO_EXPORT mgl_jpeg_save(const char *fname, int w, int h, unsigned char **p);
int MGL_NO_EXPORT mgl_bps_save(const char *fname, int w, int h, unsigned char **p);
void MGL_EXPORT mgl_data_export(HCDT dd, const char *fname, const char *scheme, double v1, double v2, long ns)
{
long nx=dd->GetNx(), ny=dd->GetNy(), nz=dd->GetNz();
if(v1>v2) return;
if(ns<0 || ns>=nz) ns=0;
if(v1==v2)
{
v1 = INFINITY; v2=-INFINITY;
for(long i=0;i<nx*ny*nz;i++)
{ mreal vv = dd->vthr(i); if(vv<v1) v1=vv; if(vv>v2) v2=vv; }
}
if(v1==v2) return;
long num=0;
unsigned char *c = mgl_create_scheme(scheme,num);
if(num<2) { delete []c; return; }
unsigned char **p = new unsigned char*[ny];
unsigned char *d = new unsigned char[3*nx*ny];
#pragma omp parallel for
for(long i=0;i<ny;i++) p[i] = d+3*nx*(ny-1-i);
#pragma omp parallel for collapse(2)
for(long i=0;i<ny;i++) for(long j=0;j<nx;j++)
{
long k = long(num*(dd->v(j,i,ns)-v1)/(v2-v1));
if(k<0) k=0;
if(k>=num) k=num-1;
memcpy(d+3*(j+i*nx),c+3*k,3);
}
delete []c;
int len=strlen(fname);
if(!strcmp(fname+len-4,".jpg") || !strcmp(fname+len-5,".jpeg")) mgl_jpeg_save(fname, nx,ny,p);
if(!strcmp(fname+len-4,".bmp")) mgl_bmp_save(fname, nx,ny,p);
if(!strcmp(fname+len-4,".png")) mgl_png_save(fname, nx,ny,p);
if(!strcmp(fname+len-4,".eps") || !strcmp(fname+len-4,".bps")) mgl_bps_save(fname, nx,ny,p);
delete []p; delete []d;
}
//-----------------------------------------------------------------------------
void MGL_EXPORT mgl_data_export_(uintptr_t *d, const char *fname, const char *scheme,mreal *v1,mreal *v2,int *ns,int l,int n)
{ char *s=new char[l+1]; memcpy(s,fname,l); s[l]=0;
char *f=new char[n+1]; memcpy(f,scheme,n); f[n]=0;
mgl_data_export(_DT_,s,f,*v1,*v2,*ns); delete []s; delete []f; }
void MGL_EXPORT mgl_data_import_(uintptr_t *d, const char *fname, const char *scheme,mreal *v1,mreal *v2,int l,int n)
{ char *s=new char[l+1]; memcpy(s,fname,l); s[l]=0;
char *f=new char[n+1]; memcpy(f,scheme,n); f[n]=0;
mgl_data_import(_DT_,s,f,*v1,*v2); delete []s; delete []f; }
//-----------------------------------------------------------------------------
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