From: george82 <george82@3789f03b-4d11-0410-bbf8-ca57d06f2519>
Date: Tue, 14 Nov 2006 15:59:25 +0000 (+0000)
Subject: Added the new method makeWeightTabs to the ScaleFilters
X-Git-Tag: v0.0.90~384^2~197
X-Git-Url: https://source.dussan.org/?a=commitdiff_plain;h=67e3f57ed23a4530536c44f45ee1bd0d8eab3e3a;p=tigervnc.git

Added the new method makeWeightTabs to the ScaleFilters
class. It's used to calculate weight coeffs on the scale
filter interval.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@2114 3789f03b-4d11-0410-bbf8-ca57d06f2519
---

diff --git a/common/rfb/ScaleFilters.cxx b/common/rfb/ScaleFilters.cxx
index d5530b72..28fa24f9 100644
--- a/common/rfb/ScaleFilters.cxx
+++ b/common/rfb/ScaleFilters.cxx
@@ -20,6 +20,7 @@
 #include <assert.h>
 #include <math.h>
 
+#include <rfb/Rect.h>
 #include <rfb/ScaleFilters.h>
 
 using namespace rfb;
@@ -84,4 +85,28 @@ SFilter ScaleFilters::create(char *name_, double radius_, filter_func func_) {
   filter.radius = radius_;
   filter.func = func_;
   return filter;
-}
\ No newline at end of file
+}
+
+void ScaleFilters::makeWeightTabs(int filter_id, int src_x, int dst_x, SFilterWeightTab *weightTabs) {
+  double sx;
+  double ratio = dst_x / src_x;
+  SFilter sFilter = filters[filter_id];
+
+  weightTabs = new SFilterWeightTab[dst_x];
+
+  // Make the weight tab for the each dest x position
+  for (int x = 0; x < dst_x; x++) {
+    sx = double(x) / ratio;
+
+    // Calculate the scale filter interval, [i0, i1)
+    int i0 = int(__rfbmin(ceil(sx-sFilter.radius), 0));
+    int i1 = int(__rfbmax(ceil(sx+sFilter.radius), src_x));
+    weightTabs[x].i0 = i0; weightTabs[x].i1 = i1;
+    weightTabs[x].weight = new float[i1-i0];
+
+    // Calculate the weight coeffs on the scale filter interval
+    for (int ci = 0, i = i0; i < i1; i++) {
+      weightTabs[x].weight[ci++] = (float)sFilter.func(float(i)-sx);
+    }
+  }
+}
diff --git a/common/rfb/ScaleFilters.h b/common/rfb/ScaleFilters.h
index 0ec0730d..317d0b41 100644
--- a/common/rfb/ScaleFilters.h
+++ b/common/rfb/ScaleFilters.h
@@ -60,6 +60,8 @@ namespace rfb {
 
     SFilter &operator[](unsigned int filter_id);
 
+    void makeWeightTabs(int filter, int src_x, int dst_x, SFilterWeightTab *weightTabs);
+
   protected:
     void initFilters();