mirror of https://github.com/fltk/fltk
142 lines
2.8 KiB
C++
142 lines
2.8 KiB
C++
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// More complex and hacked pixmap demo.
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// On purpose, I do NOT provide a fltk method to turn a file
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// into a pixmap. This program uses a rather simplistic one.
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#include <FL/Fl.H>
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#include <FL/Fl_Box.H>
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#include <FL/Fl_Window.H>
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#include <FL/Fl_Button.H>
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#include <FL/Fl_Pixmap.H>
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <FL/fl_file_chooser.H>
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#include <FL/fl_message.H>
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Fl_Box *b;
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Fl_Window *w;
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char **data;
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int sizeofdata;
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int numlines;
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static int hexdigit(int x) {
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if (isdigit(x)) return x-'0';
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if (isupper(x)) return x-'A'+10;
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if (islower(x)) return x-'a'+10;
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return 20;
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}
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int load_file(const char *name) {
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FILE *f = fopen(name,"r");
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if (!f) {
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fl_show_message("Can't open",name,strerror(errno));
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return 0;
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}
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if (data) {
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for (int i=numlines; i--;) delete[] data[i];
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}
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char buffer[1024];
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int i = 0;
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while (fgets(buffer,1024,f)) {
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if (buffer[0] != '\"') continue;
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char *p = buffer;
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char *q = buffer+1;
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while (*q != '\"') {
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if (*q == '\\') switch (*++q) {
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case '\n':
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fgets(q,(buffer+1024)-q,f); break;
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case 0:
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break;
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case 'x': {
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q++;
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int n = 0;
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for (int x = 0; x < 3; x++) {
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int d = hexdigit(*q);
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if (d > 15) break;
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n = (n<<4)+d;
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q++;
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}
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*p++ = n;
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} break;
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default: {
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int c = *q++;
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if (c>='0' && c<='7') {
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c -= '0';
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for (int x=0; x<2; x++) {
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int d = hexdigit(*q);
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if (d>7) break;
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c = (c<<3)+d;
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q++;
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}
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}
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*p++ = c;
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} break;
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} else {
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*p++ = *q++;
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}
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}
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*p++ = 0;
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if (i >= sizeofdata) {
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sizeofdata = 2*sizeofdata+100;
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char **newdata = new char *[sizeofdata];
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for (int j=0; j<i; j++) newdata[j] = data[j];
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delete[] data;
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data = newdata;
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}
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data[i] = new char[p-buffer];
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memcpy(data[i],buffer,p-buffer);
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i++;
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}
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numlines = i;
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fclose(f);
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return i;
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}
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Fl_Pixmap *pixmap;
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void newpixmap() {
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delete pixmap;
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pixmap = new Fl_Pixmap(data);
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pixmap->label(b);
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w->redraw();
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}
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static char name[1024];
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void file_cb(const char *n) {
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if (!strcmp(name,n)) return;
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if (!load_file(n)) return;
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strcpy(name,n);
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w->label(name);
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newpixmap();
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}
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void button_cb(Fl_Widget *,void *) {
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fl_file_chooser_callback(file_cb);
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fl_file_chooser("XPM file","*.xpm",name);
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fl_file_chooser_callback(0);
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}
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int dvisual = 0;
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int arg(int, char **argv, int &i) {
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if (argv[i][1] == '8') {dvisual = 1; i++; return 1;}
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return 0;
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}
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int main(int argc, char **argv) {
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int i = 1;
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if (Fl::args(argc,argv,i,arg) < argc)
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Fl::fatal(" -8 # : use default visual\n%s\n",Fl::help);
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Fl_Window window(400,400); ::w = &window;
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Fl_Box b(0,0,window.w(),window.h()); ::b = &b;
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Fl_Button button(5,5,100,35,"load");
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button.callback(button_cb);
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if (!dvisual) Fl::visual(FL_RGB);
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window.resizable(window);
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window.show(argc,argv);
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return Fl::run();
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}
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