From 88254b03ccd351d5acc4ba582f0e9c092a60f433 Mon Sep 17 00:00:00 2001
From: scuri <scuri>
Date: Tue, 28 Sep 2010 17:32:52 +0000
Subject: Fixed: polygon filling in CD_IMAGERGB driver when there are many
 horizontal lines in sequence on the same polygon.

---
 html/en/history.html       |  4 ++++
 mak.vc9/cdcore.vcproj      |  4 ++++
 src/sim/sim_linepolyfill.c | 16 +++++++++++++---
 3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/html/en/history.html b/html/en/history.html
index 678a7b5..e5f073f 100644
--- a/html/en/history.html
+++ b/html/en/history.html
@@ -46,6 +46,10 @@
 		<span class="hist_fixed">Fixed:</span> background transparency was not 
 		being considered when backopacity was set to OPAQUE after the background 
 		color was set in the GDI+ base driver.</li>
+	<li>
+		<span class="hist_fixed">Fixed:</span> polygon filling in CD_IMAGERGB 
+		driver when there are many horizontal lines in sequence on the same 
+		polygon.</li>
 </ul>
 <h3><a href="http://sourceforge.net/projects/canvasdraw/files/5.4/">Version 5.4</a> (24/June/2010)</h3>
 <ul>
diff --git a/mak.vc9/cdcore.vcproj b/mak.vc9/cdcore.vcproj
index 93c3a77..919c9d8 100644
--- a/mak.vc9/cdcore.vcproj
+++ b/mak.vc9/cdcore.vcproj
@@ -468,6 +468,10 @@
 			RelativePath="..\src\cd.def"
 			>
 		</File>
+		<File
+			RelativePath=".\cd.vcproj"
+			>
+		</File>
 		<File
 			RelativePath="..\src\cd_active.c"
 			>
diff --git a/src/sim/sim_linepolyfill.c b/src/sim/sim_linepolyfill.c
index 745c70b..93758be 100644
--- a/src/sim/sim_linepolyfill.c
+++ b/src/sim/sim_linepolyfill.c
@@ -390,6 +390,8 @@ static void simAddHxx(int *hh, int *hh_count, int x1, int x2)
 
   int i, count = *hh_count;
 
+  assert(count%2==0);
+
   if (x1 > x2)
   {
     int t = x2;
@@ -423,6 +425,8 @@ static void simMergeHxx(int *xx, int *xx_count, int *hh, int hh_count)
 {
   int hh_i;
 
+  assert(hh_count%2==0);
+
   if (*xx_count == 0)
   {
     memcpy(xx, hh, hh_count*sizeof(int));
@@ -444,7 +448,7 @@ int simPolyFindHorizontalIntervals(simLineSegment *segments, int n_seg, int* xx,
   simLineSegment *seg_i;
   int i, hh_count = 0;
   int xx_count = 0;  /* count the number of points in the horizontal line,
-                       each pair will form an horizontal interval */
+                        each pair will form an horizontal interval */
 
   /* for all segments, calculates the intervals to be filled 
      from the intersection with the horizontal line y. */
@@ -481,10 +485,16 @@ int simPolyFindHorizontalIntervals(simLineSegment *segments, int n_seg, int* xx,
         simAddHxx(hh, &hh_count, seg_i_next->x1, seg_i_next->x2);
 
         i++;
-        i_next = (i==n_seg-1)? 0: i+1;
-        seg_i_next = segments + i_next;
+        if (i < n_seg)
+        {
+          i_next = (i==n_seg-1)? 0: i+1;
+          seg_i_next = segments + i_next;
+        }
       }
 
+      if (i == n_seg)
+        break;
+
       /* save the next y, not in the horizontal line */
       if (seg_i_next->y1 == y)
         next_y = seg_i_next->y2;
-- 
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