[Plplot-cvs] SF.net SVN: plplot:[10866] trunk/drivers/cairo.c

[<hez...@us...>]

Revision: 10866
          http://plplot.svn.sourceforge.net/plplot/?rev=10866&view=rev
Author:   hezekiahcarty
Date:     2010-03-14 15:44:48 +0000 (Sun, 14 Mar 2010)

Log Message:
-----------
If the background is transparent, use a white under-layer

This fixes the "bleeding through" of previous plot pages when using the
xcairo driver.

Modified Paths:
--------------
    trunk/drivers/cairo.c

Modified: trunk/drivers/cairo.c
===================================================================
--- trunk/drivers/cairo.c	2010-03-14 06:55:16 UTC (rev 10865)
+++ trunk/drivers/cairo.c	2010-03-14 15:44:48 UTC (rev 10866)
@@ -376,6 +376,11 @@
 
     /* Fill in the window with the background color. */
     cairo_rectangle( aStream->cairoContext, 0.0, 0.0, pls->xlength, pls->ylength );
+    if ( (double) pls->cmap0[0].a < 1.0 )
+    {
+        cairo_set_source_rgba( aStream->cairoContext, 1.0, 1.0, 1.0, 1.0 );
+        cairo_fill_preserve( aStream->cairoContext );
+    }
     cairo_set_source_rgba( aStream->cairoContext,
         (double) pls->cmap0[0].r / 255.0,
         (double) pls->cmap0[0].g / 255.0,


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