Change to things to make performance testing easier

[ipdf/code.git] / src / tests / bmpdiff.cpp

diff --git a/src/tests/bmpdiff.cpp b/src/tests/bmpdiff.cpp
new file mode 100644 (file)
index 0000000..02ab568
--- /dev/null
+++ b/src/tests/bmpdiff.cpp
@@ -0,0 +1,75 @@
+/**
+ * Get diff of bmps
+ */
+
+#include <SDL.h>
+#include <cassert>
+#include "ipdf.h"
+
+using namespace std;
+using namespace IPDF;
+
+
+int main(int argc, char ** argv)
+{
+       SDL_Surface * orig = SDL_LoadBMP(argv[1]);
+       SDL_Surface * diff = SDL_LoadBMP(argv[2]);
+       
+       assert(orig->w == diff->w && orig->h == diff->h);
+       int w = diff->w;
+       int h = diff->h;
+       
+       uint8_t * a = (uint8_t*)orig->pixels;
+       uint8_t * b = (uint8_t*)diff->pixels;
+       
+       int total_diff = 0;
+
+       int mean_dist = 0;
+       int count_a = 0;
+       int count_b = 0;
+       for (int x = 0; x < w; ++x)
+       {
+               for (int y = 0; y < h; ++y)
+               {
+                       if (a[4*(x + w*y)] == 0)
+                               ++count_a;
+                       if (b[4*(x + w*y)] == 0)
+                               ++count_b;
+                       
+                       if (a[4*(x + w*y)] != b[4*(x + w*y)] && b[4*(x+w*y)] == 0)                              
+                       {
+                               total_diff++;
+                               // 
+
+                               int r = 1;
+                               for (r=1; r+x < w; ++r)
+                               {
+                                       if (a[4*(x+r + w*y)] == 0)
+                                               break;
+                               }
+                               int l = 1;
+                               for (l=1; x-l >= 0; ++l)
+                               {
+                                       if (a[4*(x-l + w*y)] == 0)
+                                               break;
+                               }
+                               int u = 1;
+                               for (u=1; y-u >= 0; ++u)
+                               {
+                                       if (a[4*(x + w*(y-u))] == 0)
+                                               break;
+                               }
+                               
+                               int d = 1;
+                               for (d=1; y+d < h; ++d)
+                               {
+                                       if (a[4*(x + w*(y+d))] == 0)
+                                               break;
+                               }
+                               
+                               mean_dist += min(min(d,u), min(r,l));
+                       }
+               }
+       }
+       printf("%d\t%d\t%d\t%lf\n", count_a, count_b, total_diff, (double)mean_dist / (double)count_b);
+}