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[raster] Add undocumented drop-out rule to the other bbox side also.

* src/raster/ftraster.c (Vertical_Sweep_Drop,
Horizontal_Sweep_Drop): Implement it.

git/fs: mount .git/fs: mount/attach disallowed

--- a/ChangeLog

+++ b/ChangeLog

@@ -1,5 +1,12 @@

 2011-01-13  Werner Lemberg  <[email protected]>

+	[raster] Add undocumented drop-out rule to the other bbox side also.

+

+	* src/raster/ftraster.c (Vertical_Sweep_Drop,

+	Horizontal_Sweep_Drop): Implement it.

+

+2011-01-13  Werner Lemberg  <[email protected]>

+

 	[raster] Reduce jitter value.

 	This catches a rendering problem with glyph `x' from Tahoma at

--- a/src/raster/ftraster.c

+++ b/src/raster/ftraster.c

@@ -2426,9 +2426,12 @@

         }

         /* undocumented but confirmed: If the drop-out would result in a  */

-        /* pixel outside of the bounding box, use the right pixel instead */

+        /* pixel outside of the bounding box, use the pixel inside of the */

+        /* bounding box instead                                           */

         if ( pxl < 0 )

           pxl = e1;

+        else if ( TRUNC( pxl ) >= ras.bWidth )

+          pxl = e2;

         /* check that the other pixel isn't set */

         e1 = pxl == e1 ? e2 : e1;

@@ -2606,10 +2609,13 @@

           return;  /* no drop-out control */

         }

-        /* undocumented but confirmed: If the drop-out would result in a */

-        /* pixel outside of the bounding box, use the top pixel instead  */

+        /* undocumented but confirmed: If the drop-out would result in a  */

+        /* pixel outside of the bounding box, use the pixel inside of the */

+        /* bounding box instead                                           */

         if ( pxl < 0 )

           pxl = e1;

+        else if ( TRUNC( pxl ) >= ras.target.rows )

+          pxl = e2;

         /* check that the other pixel isn't set */

         e1 = pxl == e1 ? e2 : e1;