add -2

pandatool/src/imageprogs/imageInfo.cxx

@@ -30,6 +30,13 @@ ImageInfo() {
   set_program_description
     ("This program reads the headers of a series of one or more "
      "image files and reports the image sizes to standard output.");
+
+  add_option
+    ("2", "", 0,
+     "Report only images that have a non-power-of-two size in either "
+     "dimension.  Images whose dimensions are both a power of two will "
+     "not be mentioned.",
+     &ImageInfo::dispatch_none, &_report_power_2, NULL);
 }
 
 ////////////////////////////////////////////////////////////////////
@@ -52,12 +59,16 @@ run() {
       }
     } else {
       // Successfully read the image header.
+      if (!_report_power_2 || 
+          !is_power_2(header.get_x_size()) ||
+          !is_power_2(header.get_y_size())) {
         nout << filename << ": " << header.get_x_size() << " x "
              << header.get_y_size() << " x " << header.get_num_channels()
              << " (maxval = " << header.get_maxval() << ")\n";
       }
     }
   }
+}
 
 ////////////////////////////////////////////////////////////////////
 //     Function: ImageInfo::handle_args
@@ -78,6 +89,17 @@ handle_args(ProgramBase::Args &args) {
   return true;
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: ImageInfo::is_power_2
+//       Access: Private
+//  Description: Returns true if the indicated value is a power of 2,
+//               false otherwise.
+////////////////////////////////////////////////////////////////////
+bool ImageInfo::
+is_power_2(int value) const {
+  return (value & (value - 1)) == 0;
+}
+
 
 int main(int argc, char *argv[]) {
   // A call to pystub() to force libpystub.so to be linked in.

pandatool/src/imageprogs/imageInfo.h

@@ -38,7 +38,11 @@ public:
 protected:
   virtual bool handle_args(Args &args);
 
+private:
+  bool is_power_2(int value) const;
+
   Args _filenames;
+  bool _report_power_2;
 };
 
 #endif