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/************************************************************************
This is a very simplistic image viewer. It uses libgfx routines to
read a set of image files specified on the command line. These images
are then displayed in a window using OpenGL image operations.
by Michael Garland, 2000.
$Id: t-glimg.cxx 426 2004-09-27 04:34:55Z garland $
************************************************************************/
#include <gfx/gfx.h>
#include <gfx/gui.h>
#include <gfx/raster.h>
#include <string>
#include <vector>
#include <FL/filename.H>
class GUI : public MxGUI
{
public:
std::vector<ByteRaster *> images;
std::vector<std::string> image_names;
int current_image;
virtual ~GUI();
virtual void update_animation();
virtual void cmdline_file(const char *file);
virtual void setup_for_drawing();
virtual void draw_contents();
void set_image(int i);
};
GUI gui;
GUI::~GUI()
{
for(int i=0; i<images.size(); i++)
if( images[i] )
delete images[i];
}
static void cb_image(Fl_Widget *, long i)
{ gui.set_image(i); gui.canvas->redraw(); }
void GUI::set_image(int i)
{
current_image = i;
if(current_image<0 || current_image>=images.size()) return;
ByteRaster *img = images[current_image];
int width = img->width();
int height = img->height();
gui.status(image_names[current_image].c_str());
if( width!=canvas->w() || height!=canvas->h() )
{
unlock_size();
resize_canvas(width, height);
lock_size();
}
}
void GUI::cmdline_file(const char *namestring)
{
if(!namestring) return; // Don't support reading from stdin
static std::string img_menu("&Images/");
std::string filename(fl_filename_name(namestring)); // Strip directories
ByteRaster *img = read_image(namestring);
if( img )
{
int id = images.size();
images.push_back(img);
image_names.push_back(namestring);
int key = id<9 ? FL_CTRL+'1'+id : 0;
gui.menu_bar->add((img_menu+filename).c_str(), key,
(Fl_Callback *)cb_image, (void *)id, FL_MENU_RADIO);
}
}
void GUI::update_animation()
{
set_image((current_image+1) % images.size());
}
void GUI::setup_for_drawing()
{
glClearColor(0.9f, 0.0f, 0.0f, 0.0f);
glDisable(GL_DEPTH_TEST);
glDisable(GL_LIGHTING);
glPixelZoom(1.0f, -1.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
static void draw_image(const ByteRaster *img)
{
GLenum format;
if(img->channels()==1) format = GL_LUMINANCE;
else if(img->channels()==3) format = GL_RGB;
else if(img->channels()==4) format = GL_RGBA;
else return; // Don't draw unsupported formats
glPushAttrib(GL_PIXEL_MODE_BIT);
glRasterPos2f(0, img->height());
glDrawPixels(img->width(), img->height(),
format, GL_UNSIGNED_BYTE, img->head());
glPopAttrib();
}
void GUI::draw_contents()
{
glClear(GL_COLOR_BUFFER_BIT);
if(current_image<0 || current_image>=images.size()) return;
ByteRaster *img = images[current_image];
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0, img->width(), 0, img->height());
draw_image(img);
}
int main(int argc, char **argv)
{
gui.initialize(argc, argv);
if(gui.images.size() == 0) return 0; // Exit if no images read
gui.title("OpenGL Image Viewer");
gui.default_fps = 1.0f;
gui.set_image(0);
return gui.run();
}
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