improved file chooser dialog

image_read.cpp

@@ -62,6 +62,8 @@ unsigned char *FileRead::read_image(const char *new_image,int *width,int *height
     return NULL;
 }
 
+const char *FileRead::image_types="All images (*.png *.jpg *.jpeg *.pnm *.pbm *.pgm *.ppm);;PNG images (*.png);;JPG images (*.jpg *.jpeg);;PBM images (*.pnm *.pbm *.pgm *.ppm);;All files (*)";
+
 unsigned char *FileRead::jpgRead(const char *texturePath,
                                  int *outImageWidth,
                                  int *outImageHeight){

image_read.h

@@ -28,6 +28,7 @@ class FileRead{
         static enum FileType get_file_type(const char*);
     protected:
         static unsigned char *read_image(const char*,int*,int*);
+        static const char *image_types;
     private:
         static unsigned char *jpgRead(const char*,int*,int*);
         static unsigned char *pngRead(const char*,int*,int*);

openglcanvas.cpp

@@ -279,8 +279,11 @@ void OpenGLCanvas::load_image(const char *new_image){
 }
 
 void OpenGLCanvas::change_input_image(){
-    load_image(QFileDialog::getOpenFileName(this,tr("Choose Panorama File")).toStdString().c_str());
-    updateGL();
+        const char *fname=QFileDialog::getOpenFileName(this,tr("Choose Panorama File"),"",FileRead::image_types).toStdString().c_str();
+        if(strlen(fname)>0){
+                load_image(fname);
+                updateGL();
+        }
 }
 
 void OpenGLCanvas::initializeGL(){
@@ -305,7 +308,7 @@ void OpenGLCanvas::initializeGL(){
     // If the input file does not exist or was not specified.
     struct stat testbuf;
     if(stat(input_image_file,&testbuf)||!strcmp(input_image_file,"")){
-        load_image(QFileDialog::getOpenFileName(this,tr("Choose Panorama File")).toStdString().c_str());
+        load_image(QFileDialog::getOpenFileName(this,tr("Choose Panorama File"),"",FileRead::image_types).toStdString().c_str());
     }else{
         load_image(input_image_file);
     }