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//
// "$Id: fltk.cpp,v 1.1 2002-01-30 23:51:19 edgomez Exp $"
//
// fl_draw_image test program for the Fast Light Tool Kit (FLTK).
//
// Be sure to try every visual with the -v switch and try -m (monochrome)
// on each of them.
//
// This program requires either the libjpeg.a library or an internal DD
// library to read images (this is chosen by the presence of the "DD"
// #define).
//
// To get the jpeg library:
//
// The "official" archive site for this software is ftp.uu.net (Internet
// address 192.48.96.9). The most recent released version can always be
// found there in directory graphics/jpeg. This particular version will
// be archived as graphics/jpeg/jpegsrc.v6a.tar.gz.
//
// The makefile assummes you decompressed and build these in a directory
// called "jpeg-6a" in the same location as the "FL" directory.
//
// Copyright 1998-2000 by Bill Spitzak and others.
//
// This library 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 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems to "fltk-bugs@fltk.org".
//
#include <FL/Fl.H>
#include <FL/fl_draw.H>
#include <stdio.h>
#include <stdlib.h>
void readtheimage(const char *name); // below
int width;
int height;
int depth;
int linedelta;
uchar *ibuffer;
#pragma comment(lib, "libjpeg.lib")
////////////////////////////////////////////////////////////////
#include <FL/Fl_Window.H>
int mono;
class image_window : public Fl_Window {
void draw();
public:
image_window(int w,int h) : Fl_Window(w,h) {box(FL_NO_BOX);}
};
void image_window::draw() {
if (mono)
fl_draw_image_mono(ibuffer+1,0,0,width,height,depth,linedelta);
else
fl_draw_image(ibuffer,0,0,width,height,depth,linedelta);
}
////////////////////////////////////////////////////////////////
#include <FL/x.H>
#include "list_visuals.cxx"
////////////////////////////////////////////////////////////////
int visid = -1;
int arg(int argc, char **argv, int &i) {
if (argv[i][1] == 'm') {mono = 1; i++; return 1;}
if (argv[i][1] == 'v') {
if (i+1 >= argc) return 0;
visid = atoi(argv[i+1]);
i += 2;
return 2;
}
return 0;
}
int main(int argc, char ** argv) {
int i = 1;
if (!Fl::args(argc,argv,i,arg) || i != argc-1) {
fprintf(stderr,"usage: %s <switches> image_file\n"
" -v # : use visual\n"
" -m : monochrome\n"
"%s\n",
argv[0],Fl::help);
exit(1);
}
readtheimage(argv[i]);
image_window *window = new image_window(width,height);
if (visid>=0) {
/*fl_open_display();
XVisualInfo templt; int num;
templt.visualid = visid;
fl_visual = XGetVisualInfo(fl_display, VisualIDMask, &templt, &num);
if (!fl_visual) {
fprintf(stderr, "No visual with id %d, use one of:\n",visid);
//list_visuals();
exit(1);
}
fl_colormap = XCreateColormap(fl_display, RootWindow(fl_display,fl_screen),
fl_visual->visual, AllocNone);
fl_xpixel(FL_BLACK); // make sure black is allocated*/
}
window->show(argc,argv);
return Fl::run();
}
////////////////////////////////////////////////////////////////
extern "C" {
#include "jpeglib.h"
}
void readtheimage(const char *name) {
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
FILE * infile = fopen(name, "rb");
if (!infile) {
fprintf(stderr, "can't open %s\n", name);
exit(1);
}
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
jpeg_stdio_src(&cinfo, infile);
jpeg_read_header(&cinfo, TRUE);
jpeg_start_decompress(&cinfo);
width = cinfo.output_width;
height = cinfo.output_height;
depth = cinfo.output_components;
ibuffer = new uchar[width*height*depth];
uchar *rp = ibuffer;
// for (int i=0; i<height; i++) {
for (int i=height; i--; ) {
jpeg_read_scanlines(&cinfo, &rp, 1);
rp += width*depth;
}
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
fclose(infile);
}
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