Fixed rendering of grayscale images with alpha channel on unaccelerated machines. Thanks, Sanel (STR #1703)

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@5888 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

2 files changed, 3 insertions, 1 deletions

diff --git a/CHANGES b/CHANGES
index ab3c6056b..280e7d1c3 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3,6 +3,8 @@ CHANGES IN FLTK 1.1.8
 	- Documentation fixes (STR #1454, STR #1455, STR #1456,
 	  STR #1457, STR #1458, STR #1460, STR #1481, STR #1578,
 	  STR #1639, STR #1645, STR #1644)
+	- Fixed rendering of grayscale images with alpha
+	  channel (STR #1703)
 	- Fixed occasional incomplete refresh (STR #1681)
 	- Improved fl_down, fl_frame, added fl_box (STR #1678)
 	- Fixed selection of submenu items in 
diff --git a/src/Fl_Image.cxx b/src/Fl_Image.cxx
index b243eb274..553000fa8 100644
--- a/src/Fl_Image.cxx
+++ b/src/Fl_Image.cxx
@@ -344,7 +344,7 @@ static void alpha_blend(Fl_RGB_Image *img, int X, int Y, int W, int H, int cx, i
     // Composite grayscale + alpha over RGB...
     // Composite RGBA over RGB...
     for (int y = H; y > 0; y--, srcptr+=srcskip)
-      for (int x = W; x > 0; x--, dstptr+=3) {
+      for (int x = W; x > 0; x--) {
 	srcg = *srcptr++;
 	srca = *srcptr++;