Attached is a simple image viewer for SharedImage.
The test files are the files in test/images:
coucou.gif coucou.png coucou.xpm testimg.jpg ulon.bmp
JPG image: normal draw().
XPM image: excessive draw().
PNG image: excessive draw().
BMP image: normal draw().
GIF image: excessive draw().
Some other PNG images (mostly without transparency) behave normal.
But when I move the mouse within the window or within the file_chooser, the
image is redrawn.
The same happens with ulon.bmp : moving the mouse within the file_chooser
triggers a draw().
Current version:fltk-2.0.x-r6970
Re-Installing fltk-2.0.x-r6671: same behaviour.
I have converted the viewer to fltk-1.3. No excessive draw(). No draw()
during mouse move.
winfried
=================== FLTK 20 ===================
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fltk/run.h>
#include <fltk/draw.h>
#include <fltk/filename.h>
#include <fltk/Widget.h>
#include <fltk/Window.h>
#include <fltk/Button.h>
#include <fltk/SharedImage.h>
#include <fltk/file_chooser.h>
#include <fltk/ask.h>
#define HEADER_H 45
#define WINMIN_W 210
using namespace fltk;
static Window *main_win;
static SharedImage *sim;
class Canvas: public Widget
{
void draw();
public:
Canvas(int x,int y,int w,int h)
: Widget(x,y,w,h)
{
}
};
static Canvas *canvas;
static int draw_count;
void Canvas::draw()
{
printf("DRAW %d\n",++draw_count);
if(sim)
{
int ww, iw, ih;
sim->measure(iw, ih);
if((ww = iw) < WINMIN_W) ww = WINMIN_W;
main_win->resize(ww, HEADER_H + ih);
resize(iw, ih);
sim->draw(0, 0);
return;
}
}
void get_image(const char *name)
{
sim = SharedImage::get(name);
if(sim == NULL)
{
alert("No SharedImage possible for\n%s",name);
return;
}
canvas->redraw();
}
static char name[1024];
static void file_cb(const char *n)
{
if( !filename_exist(n)) return;
if(filename_isdir(n)) return;
strcpy(name, n);
main_win->label(filename_name(name));
get_image(name);
}
static void cancel_cb(Widget *, void *)
{
exit(0);
}
static void load_cb(Widget *,void *)
{
file_chooser_callback(file_cb);
file_chooser("Image File","*.{xpm,png,jpg,gif,bmp}", ".");
file_chooser_callback(NULL);
}
int main(int argc, char **argv)
{
register_images();
main_win = new Window(400,HEADER_H+400);
main_win->label("Pixmap Browser");
main_win->begin();
{
Button *b = new Button(5,5,100,35,"Load");
b->callback(load_cb);
}
{
Button *b = new Button(105,5,100,35,"Cancel");
b->callback(cancel_cb);
}
canvas = new Canvas(0,HEADER_H,400,400);
main_win->end();
main_win->resizable(canvas);
main_win->show();
if (argv[1]) file_cb(argv[1]);
return run();
}
=================== FLTK 13 ===================
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <FL/Fl.H>
#include <FL/fl_draw.H>
#include <FL/filename.H>
#include <FL/Fl_Widget.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Shared_Image.H>
#include <FL/Fl_File_Chooser.H>
#include <FL/fl_ask.H>
#define HEADER_H 45
#define WINMIN_W 210
static Fl_Window *main_win;
static Fl_Shared_Image *sim;
class Canvas: public Fl_Widget
{
void draw();
public:
Canvas(int x,int y,int w,int h)
: Fl_Widget(x,y,w,h)
{
}
};
static Canvas *canvas;
static int draw_count;
void Canvas::draw()
{
printf("DRAW(%p) %d\n",(void*)sim,++draw_count);
if(sim)
{
int ww, iw, ih;
iw = sim->w(); ih = sim->h();
if((ww = iw) < WINMIN_W) ww = WINMIN_W;
main_win->resize(main_win->x(), main_win->y(), ww, HEADER_H + ih);
resize(x(), y(),iw, ih);
sim->draw(x(), y());
return;
}
}
void get_image(const char *name)
{
sim = Fl_Shared_Image::get(name);
if(sim == NULL)
{
fl_alert("No SharedImage possible for\n%s",name);
return;
}
canvas->redraw();
}
static char name[1024];
static void file_cb(const char *n)
{
if(fl_filename_isdir(n)) return;
strcpy(name, n);
main_win->label(fl_filename_name(name));
get_image(name);
}
static void cancel_cb(Fl_Widget *, void *)
{
exit(0);
}
static void load_cb(Fl_Widget *,void *)
{
fl_file_chooser_callback(file_cb);
fl_file_chooser("Image File","*.{xpm,png,jpg,gif,bmp}", ".");
fl_file_chooser_callback(NULL);
}
int main(int argc, char **argv)
{
fl_register_images();
main_win = new Fl_Window(200,200,400,HEADER_H+400);
main_win->label("Pixmap Browser");
main_win->begin();
{
Fl_Button *b = new Fl_Button(5,5,100,35,"Load");
b->callback(load_cb);
}
{
Fl_Button *b = new Fl_Button(105,5,100,35,"Cancel");
b->callback(cancel_cb);
}
canvas = new Canvas(0,HEADER_H,400,400);
main_win->end();
main_win->resizable(canvas);
main_win->show();
if (argv[1]) file_cb(argv[1]);
return Fl::run();
}
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