fix roundoff error in fill()

panda/src/pnmimage/pnmImage.I

@@ -116,9 +116,7 @@ from_val(xelval input_value) const {
 ////////////////////////////////////////////////////////////////////
 INLINE void PNMImage::
 fill(double red, double green, double blue) {
-  fill_val((xelval)(red * get_maxval()),
-           (xelval)(green * get_maxval()),
-           (xelval)(blue * get_maxval()));
+  fill_val(to_val(red), to_val(green), to_val(blue));
 }
 
 ////////////////////////////////////////////////////////////////////
@@ -150,7 +148,7 @@ fill_val(xelval gray) {
 ////////////////////////////////////////////////////////////////////
 INLINE void PNMImage::
 alpha_fill(double alpha) {
-  alpha_fill_val((xelval)(alpha * get_maxval()));
+  alpha_fill_val(to_val(alpha));
 }
 
 ////////////////////////////////////////////////////////////////////

panda/src/pnmimage/pnmImageHeader.cxx

@@ -542,3 +542,18 @@ output(ostream &out) const {
   out << "(" << _red << ", " << _green << ", " << _blue << ", " << _alpha << ")";
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: PNMImageHeader::Histogram::write
+//       Access: Public
+//  Description: 
+////////////////////////////////////////////////////////////////////
+void PNMImageHeader::Histogram::
+write(ostream &out) const {
+  out << "Histogram: {\n";
+  PixelCount::const_iterator pi;
+  for (pi = _pixels.begin(); pi != _pixels.end(); ++pi) {
+    out << "  " << (*pi)._pixel << ": " << (*pi)._count << ",\n";
+  }
+  out << "}\n";
+}
+

panda/src/pnmimage/pnmImageHeader.h

@@ -167,6 +167,8 @@ PUBLISHED:
     INLINE int get_count(const PixelSpec &pixel) const;
     MAKE_SEQ(get_pixels, get_num_pixels, get_pixel);
 
+    void write(ostream &out) const;
+
   public:
     INLINE void swap(PixelCount &pixels, HistMap &hist_map);