- add scaleX/scaleY to the method index and gives them some examples

[imager.git] / conv.c

diff --git a/conv.c b/conv.c
index b69a05eec25bea4bc02ed5e356b70491a0b569b6..7e8513d0b8d2555f02e2609429559cdf358b25e2 100644 (file)
--- a/conv.c
+++ b/conv.c
@@ -19,23 +19,29 @@ i_conv(i_img *im,float *coeff,int len) {
   float res[11];
   i_img timg;
 
-  mm_log((1,"i_conv(im* 0x%x,coeff 0x%x,len %d)\n",im,coeff,len));
+  mm_log((1,"i_conv(im %p, coeff %p, len %d)\n",im,coeff,len));
  
   i_img_empty_ch(&timg,im->xsize,im->ysize,im->channels);
 
   center=(len-1)/2;
 
-
+  /* don't move the calculation of pc up here, it depends on which pixels
+     are readable */
   for(l=0;l<im->ysize;l++) {
     for(i=0;i<im->xsize;i++) {
       pc=0.0;
       for(ch=0;ch<im->channels;ch++) res[ch]=0;
       for(c=0;c<len;c++)
        if (i_gpix(im,i+c-center,l,&rcolor)!=-1) {
-         for(ch=0;ch<im->channels;ch++) res[ch]+=(float)(rcolor.channel[ch])*coeff[c];
+         for(ch=0;ch<im->channels;ch++) 
+            res[ch]+=(float)(rcolor.channel[ch])*coeff[c];
          pc+=coeff[c];
        }
-      for(ch=0;ch<im->channels;ch++) rcolor.channel[ch]=(unsigned char)(((res[ch]/pc>255.0)?255.0:res[ch]/pc));
+      for(ch=0;ch<im->channels;ch++) {
+        double temp = res[ch]/pc;
+        rcolor.channel[ch] = 
+          temp < 0 ? 0 : temp > 255 ? 255 : (unsigned char)temp;
+      }
       i_ppix(&timg,i,l,&rcolor);
     }
   }
@@ -49,13 +55,19 @@ i_conv(i_img *im,float *coeff,int len) {
          for(c=0;c<len;c++)
            if (i_gpix(&timg,l,i+c-center,&rcolor)!=-1)
              {
-               for(ch=0;ch<im->channels;ch++) res[ch]+=(float)(rcolor.channel[ch])*coeff[c];
+               for(ch=0;ch<im->channels;ch++) 
+                  res[ch]+=(float)(rcolor.channel[ch])*coeff[c];
                pc+=coeff[c];
              }
-         for(ch=0;ch<im->channels;ch++) rcolor.channel[ch]=(unsigned char)(((res[ch]/(float)(pc)>255.0)?255.0:res[ch]/(float)(pc)));
+         for(ch=0;ch<im->channels;ch++) {
+            double temp = res[ch]/pc;
+            rcolor.channel[ch]= 
+              temp < 0 ? 0 : temp > 255 ? 255 : (unsigned char)temp;
+          }
          i_ppix(im,l,i,&rcolor);
        }
     }
+  i_img_exorcise(&timg);
 }