Removed blur.cc since it is currently not used

src/blur.cc

@@ -1,72 +0,0 @@
-
-#include <math.h>
-#include <memory.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <cairo.h>
-#include "canvas.h"
-
-void
-Canvas::blur(cairo_surface_t *surface, int radius) {
-  // Steve Hanov, 2009
-  // Released into the public domain.
-  
-  // get width, height
-  int width = cairo_image_surface_get_width( surface );
-  int height = cairo_image_surface_get_height( surface );
-  unsigned char* dst = (unsigned char*)malloc(width*height*4);
-  unsigned* precalc = 
-      (unsigned*)malloc(width*height*sizeof(unsigned));
-  unsigned char* src = cairo_image_surface_get_data( surface );
-  double mul=1.f/((radius*2)*(radius*2));
-  int channel;
-  
-  // The number of times to perform the averaging. According to wikipedia,
-  // three iterations is good enough to pass for a gaussian.
-  const int MAX_ITERATIONS = 3; 
-  int iteration;
-
-  memcpy( dst, src, width*height*4 );
-
-  for ( iteration = 0; iteration < MAX_ITERATIONS; iteration++ ) {
-      for( channel = 0; channel < 4; channel++ ) {
-          int x,y;
-
-          // precomputation step.
-          unsigned char* pix = src;
-          unsigned* pre = precalc;
-
-          pix += channel;
-          for (y=0;y<height;y++) {
-              for (x=0;x<width;x++) {
-                  int tot=pix[0];
-                  if (x>0) tot+=pre[-1];
-                  if (y>0) tot+=pre[-width];
-                  if (x>0 && y>0) tot-=pre[-width-1];
-                  *pre++=tot;
-                  pix += 4;
-              }
-          }
-
-          // blur step.
-          pix = dst + (int)radius * width * 4 + (int)radius * 4 + channel;
-          for (y=radius;y<height-radius;y++) {
-              for (x=radius;x<width-radius;x++) {
-                  int l = x < radius ? 0 : x - radius;
-                  int t = y < radius ? 0 : y - radius;
-                  int r = x + radius >= width ? width - 1 : x + radius;
-                  int b = y + radius >= height ? height - 1 : y + radius;
-                  int tot = precalc[r+b*width] + precalc[l+t*width] - 
-                      precalc[l+b*width] - precalc[r+t*width];
-                  *pix=(unsigned char)(tot*mul);
-                  pix += 4;
-              }
-              pix += (int)radius * 2 * 4;
-          }
-      }
-      memcpy( src, dst, width*height*4 );
-  }
-
-  free( dst );
-  free( precalc );
-}