get color count from ComputeHistogram, use sprintf for hex conversion

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@47105 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/imagxpm.cpp

@@ -102,36 +102,20 @@ bool wxXPMHandler::LoadFile(wxImage *image,
     return true;
 }
 
-
-static char hexArray[] = "0123456789ABCDEF";
-
-static void DecToHex(int dec, char *buf)
-{
-    int firstDigit = (int)(dec/16.0);
-    int secondDigit = (int)(dec - (firstDigit*16.0));
-    buf[0] = hexArray[firstDigit];
-    buf[1] = hexArray[secondDigit];
-    buf[2] = 0;
-}
-
-
 bool wxXPMHandler::SaveFile(wxImage * image,
                             wxOutputStream& stream, bool WXUNUSED(verbose))
 {
-    wxString tmp;
-    char tmp_c;
-
     // 1. count colours:
     #define MaxCixels  92
     static const char Cixel[MaxCixels+1] =
                          " .XoO+@#$%&*=-;:>,<1234567890qwertyuipasdfghjk"
                          "lzxcvbnmMNBVCZASDFGHJKLPIUYTREWQ!~^/()_`'][{}|";
-    int chars_per_pixel;
-    int cols;
     int i, j, k;
 
-    cols = image->CountColours();
-    chars_per_pixel = 1;
+    wxImageHistogram histogram;
+    int cols = int(image->ComputeHistogram(histogram));
+
+    int chars_per_pixel = 1;
     for ( k = MaxCixels; cols > k; k *= MaxCixels)
         chars_per_pixel++;
 
@@ -161,9 +145,6 @@ bool wxXPMHandler::SaveFile(wxImage * image,
     stream.Write(tmpbuf, strlen(tmpbuf));
 
     // 3. create color symbols table:
-    wxImageHistogram histogram;
-    image->ComputeHistogram(histogram);
-
     char *symbols_data = new char[cols * (chars_per_pixel+1)];
     char **symbols = new char*[cols];
 
@@ -196,23 +177,20 @@ bool wxXPMHandler::SaveFile(wxImage * image,
             sprintf( tmpbuf, "\"%s c None\",\n", sym);
         else
         {
-            char rbuf[3];
-            DecToHex( (unsigned char)(key >> 16), rbuf );
-            char gbuf[3];
-            DecToHex( (unsigned char)(key >> 8), gbuf );
-            char bbuf[3];
-            DecToHex( (unsigned char)(key), bbuf );
-            sprintf( tmpbuf, "\"%s c #%s%s%s\",\n", sym, rbuf, gbuf, bbuf );
+            wxByte r = wxByte(key >> 16);
+            wxByte g = wxByte(key >> 8);
+            wxByte b = wxByte(key);
+            sprintf(tmpbuf, "\"%s c #%02X%02X%02X\",\n", sym, r, g, b);
         }
         stream.Write( tmpbuf, strlen(tmpbuf) );
     }
 
-    tmp = wxT("/* pixels */\n");
-    stream.Write( (const char*) tmp.ToAscii(), tmp.length() );
+    stream.Write("/* pixels */\n", 13);
 
     unsigned char *data = image->GetData();
     for (j = 0; j < image->GetHeight(); j++)
     {
+        char tmp_c;
         tmp_c = '\"'; stream.Write(&tmp_c, 1);
         for (i = 0; i < image->GetWidth(); i++, data += 3)
         {
@@ -226,8 +204,7 @@ bool wxXPMHandler::SaveFile(wxImage * image,
         }
         tmp_c = '\n'; stream.Write(&tmp_c, 1);
     }
-    tmp = wxT("};\n");
-    stream.Write( (const char*) tmp.ToAscii(), 3 );
+    stream.Write("};\n", 3 );
 
     // Clean up:
     delete[] symbols;