Added definitions of the 1-D filters and routines using

for the image scaling.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@2108 3789f03b-4d11-0410-bbf8-ca57d06f2519

diff --git a/common/rfb/ScaleFilters.h b/common/rfb/ScaleFilters.h
new file mode 100644 (file)
index 0000000..950838a
--- /dev/null
+++ b/common/rfb/ScaleFilters.h
@@ -0,0 +1,79 @@
+/* Copyright (C) 2006 TightVNC Team.  All Rights Reserved.\r
+ *    \r
+ * This is free software; you can redistribute it and/or modify\r
+ * it under the terms of the GNU General Public License as published by\r
+ * the Free Software Foundation; either version 2 of the License, or\r
+ * (at your option) any later version.\r
+ * \r
+ * This software is distributed in the hope that it will be useful,\r
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
+ * GNU General Public License for more details.\r
+ * \r
+ * You should have received a copy of the GNU General Public License\r
+ * along with this software; if not, write to the Free Software\r
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,\r
+ * USA.\r
+ */\r
+\r
+// -=- ScaleFilters.h\r
+//\r
+// Definitions of the 1-D filters and routines using for the image scaling.\r
+//  \r
+// \r
+\r
+#include <math.h>\r
+\r
+namespace rfb {\r
+\r
+  typedef double (*filter_func)(double x);\r
+\r
+  const double pi = 3.14159265358979;\r
+\r
+  const unsigned int scaleFilterNearestNeighbor = 0;\r
+  const unsigned int scaleFilterBilinear = 1;\r
+  const unsigned int scaleFilterBicubic = 2;\r
+  const unsigned int scaleFilterSinc = 3;\r
+\r
+  const unsigned int scaleFiltersMax = 10;\r
+\r
+  // Nearest neighbor filter function\r
+  double nearest_neighbor(double x) {\r
+    if (x < -0.5) return 0.0;\r
+    if (x < 0.5) return 1.0;\r
+    return 0.0;\r
+  }\r
+\r
+  // Linear filter function\r
+  double linear(double x) {\r
+    if (x < -1.0) return 0.0;\r
+    if (x < 0.0) return 1.0+x;\r
+    if (x < 1.0) return 1.0-x;\r
+    return 0.0;\r
+  }\r
+\r
+  // Cubic filter functions\r
+  double cubic(double x) {\r
+    double t;\r
+    if (x < -2.0) return 0.0;\r
+    if (x < -1.0) {t = 2.0+x; return t*t*t/6.0;}\r
+    if (x < 0.0) return (4.0+x*x*(-6.0+x*-3.0))/6.0;\r
+    if (x < 1.0) return (4.0+x*x*(-6.0+x*3.0))/6.0;\r
+    if (x < 2.0) {t = 2.0-x; return t*t*t/6.0;}\r
+    return 0.0;\r
+  }\r
+\r
+  // Sinc filter function\r
+  double sinc(double x) {\r
+    if (x == 0.0) return 1.0;\r
+    else return sin(pi*x)/(pi*x);\r
+  }\r
+\r
+  class ScaleFilter {\r
+  public:\r
+    char name[30];\r
+    int radius;\r
+    filter_func func;\r
+  };\r
+\r
+};\r

diff --git a/common/rfb/rfb.dsp b/common/rfb/rfb.dsp
index f24563e067b6c1dc97d30ad02b85c6cb8e713d11..b8f6e47baade13d17d0b249ff92e088787a5d9fb 100644 (file)
--- a/common/rfb/rfb.dsp
+++ b/common/rfb/rfb.dsp
@@ -629,6 +629,10 @@ SOURCE=.\ScaledPixelBuffer.h
 # End Source File\r
 # Begin Source File\r
 \r
+SOURCE=.\ScaleFilters.h\r
+# End Source File\r
+# Begin Source File\r
+\r
 SOURCE=.\SConnection.h\r
 # End Source File\r
 # Begin Source File\r