add ipi9

2020-01-09 23:12:12 +01:00
parent 7d6da47892
commit 4bc1110dd1
7 changed files with 548 additions and 0 deletions
@@ -0,0 +1,64 @@
+#include <string>
+#include <fstream>
+#include <cmath>
+
+void write_pgm(int* pixels, int horPixels, int vertPixels, std::string filename)
+{
+  if(horPixels == 0 || vertPixels == 0)
+  {
+    std::cerr << "Leeres Pixel Array" << std::endl;
+    return;
+  }
+
+  // write file
+  // unfortunately we cannot use C++-11 which would simplify our life in that case
+  std::ofstream outfile;
+  outfile.open(filename.c_str());
+
+  outfile << "P2" << std::endl
+          << horPixels << " " << vertPixels << std::endl;
+
+  // renormalize if necessary
+  int maxVal = 0;
+  for(int entry=0; entry<horPixels*vertPixels; entry++)
+    maxVal = std::max(pixels[entry],maxVal);
+
+  // renormalizing output
+  if(maxVal > 65535)
+  {
+    outfile << 65535 << std::endl;
+    for(int j=0, entry=0; j<vertPixels; j++)
+    {
+      for(int i=0; i<horPixels; i++, entry++)
+      {
+        if(pixels[entry] < 0)
+        {
+          std::cerr << "Negativer Eintrag bei (" << i << ", " << j << ")" << std::endl;
+          return;
+        }
+        outfile << std::floor(pixels[entry] * (65535./maxVal)) << " ";
+      }
+      outfile << std::endl;
+    }
+  }
+  // normal output
+  else
+  {
+    outfile << maxVal << std::endl;
+    for(int j=0; j<vertPixels; j++)
+    {
+      for(int i=0; i<horPixels; i++)
+      {
+        int entry = i + horPixels*(vertPixels-1-j);
+        if(pixels[entry] < 0)
+        {
+          std::cerr << "Negativer Eintrag bei (" << i << ", " << j << ")" << std::endl;
+          return;
+        }
+        outfile << pixels[entry] << " ";
+      }
+      outfile << std::endl;
+    }
+  }
+  outfile.close();
+}