[cairo-commit] cairo ChangeLog,1.290,1.291 TODO,1.26,1.27

[Carl Worth]

Committed by: cworth

Update of /cvs/cairo/cairo
In directory gabe:/tmp/cvs-serv11898

Modified Files:
	ChangeLog TODO 
Log Message:

        * TODO: Add Owen's new equation to fix clipping:
        ((src Op dest) In clip) Add (dest Out clip)


Index: ChangeLog
===================================================================
RCS file: /cvs/cairo/cairo/ChangeLog,v
retrieving revision 1.290
retrieving revision 1.291
diff -u -d -r1.290 -r1.291
--- ChangeLog	6 Jan 2005 18:28:10 -0000	1.290
+++ ChangeLog	7 Jan 2005 05:28:07 -0000	1.291
@@ -1,3 +1,8 @@
+2005-01-07  Carl Worth  <cworth at cworth.org>
+
+	* TODO: Add Owen's new equation to fix clipping:
+	((src Op dest) In clip) Add (dest Out clip)
+
 2005-01-06  Carl Worth  <cworth at cworth.org>
 
 	* TODO: Added some TODO items from mailing list traffic.

Index: TODO
===================================================================
RCS file: /cvs/cairo/cairo/TODO,v
retrieving revision 1.26
retrieving revision 1.27
diff -u -d -r1.26 -r1.27
--- TODO	6 Jan 2005 18:28:10 -0000	1.26
+++ TODO	7 Jan 2005 05:28:07 -0000	1.27
@@ -1,13 +1,19 @@
-* Add cairo_show_surface_mask, and make everything respect current
-  alpha. This means the equation should be something like:
+* Fix clipping to work for all operators. The equation we have come up
+  with is:
 
-	((PATTERN IN ALPHA) IN (SHAPE IN CLIP)) OP DEST
+	((src Op dest) In clip) Add (dest Out clip)
 
-  Except where IN may not be the right operator for clipping for some
-  choices of OP.
+* Resolve the rest of the rendering equation. We need a fundamental
+  equation upon which more convenient operations are based, (at least
+  formally). Some of the common operations that should be convenient:
 
-* Fix the rendering equation (or implementation) so that clipping
-  works as expected.
+	* display surface
+	* display surface multiplied by constant alpha
+	* display pattern masked by surface
+
+  So this involves deciding whether to expose a new mask object in the
+  graphics state, and deciding exactly what set_alpha means. It almost
+  certainly means adding cairo_show_surface_mask.
 
 * Implement a hidden transform, (as per the result of the hidden
   offset thread on the mailing list).