A little screenshot program with FLTK & libpng
Tested with FLWM & JWM
flshot.cpp (or any name you like)
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/fl_draw.H>
//#include <FL/x.H>
#include <X11/extensions/shape.h>
#include <png.h>
XRectangle rect;
unsigned char *p;
char fname[128];
void save_png(const char *dst,unsigned char* pixels,int w,int h){
FILE *fp;
fp = fl_fopen(dst, "wb");
png_structp png = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
png_infop info = png_create_info_struct(png);
png_bytep ptr = (png_bytep)pixels;
png_init_io(png, fp);
png_set_IHDR(png, info, w, h, 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
png_write_info(png, info);
for (int i = h; i > 0; i--, ptr += w * 3) {
png_write_row(png,ptr);
}
png_write_end(png,info);
png_destroy_write_struct(&png, &info);
fclose(fp);
}
class WIN : public Fl_Window {
public:
WIN(int w, int h, const char*l = 0):Fl_Window(w,h,l){}
void draw(){
Fl::wait(10);
p = fl_read_image(0,0,0,w(),h());
if(p){
save_png(fname,p,w(),h());
delete[]p;
}
hide();
}
};
int main(int argc, char *argv[]) {
WIN *win = new WIN(30,30);
win->border(0);
win->fullscreen();
win->show();
XShapeCombineRectangles(fl_display,fl_xid(win),0,0,0,&rect,0,ShapeSet,0);
strcpy(fname,argc>1 ? argv[1] : "screenshot.png");
return Fl::run();
}
build
#!/bin/sh
prog='flshot'
echo 'Compiling ...'
g++ $prog.cpp -o $prog `fltk-config --cxxflags --use-images --ldflags`
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