[gegl] removed arbitrary constants and reversed offset direction
- From: Øyvind Kolås <ok src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gegl] removed arbitrary constants and reversed offset direction
- Date: Thu, 13 Jan 2011 22:23:09 +0000 (UTC)
commit 76cb7e30934883229b97b8b599919aae6a61bba6
Author: Andy Gill <andyggill gmail com>
Date: Thu Jan 13 21:47:47 2011 +0000
removed arbitrary constants and reversed offset direction
operations/common/checkerboard.c | 10 ++++++----
1 files changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/operations/common/checkerboard.c b/operations/common/checkerboard.c
index fefc5fc..0896d0e 100644
--- a/operations/common/checkerboard.c
+++ b/operations/common/checkerboard.c
@@ -50,8 +50,7 @@ prepare (GeglOperation *operation)
static GeglRectangle
get_bounding_box (GeglOperation *operation)
{
- GeglRectangle result = {-10000000, -10000000, 20000000, 20000000};
- return result;
+ return gegl_rectangle_infinite_plane ();
}
static gboolean
@@ -74,8 +73,11 @@ process (GeglOperation *operation,
{
gint nx,ny;
- nx = ((x + o->x_offset + 100000 * o->x)/o->x) ;
- ny = ((y + o->y_offset + 100000 * o->y)/o->y) ;
+ nx = (x - o->x_offset)/o->x;
+ ny = (y - o->y_offset)/o->y;
+ /* shift negative cell indices, because / rounds towards zero. */
+ nx -= (x - o->x_offset) < 0 ? 1 : 0;
+ ny -= (y - o->y_offset) < 0 ? 1 : 0;
if ( (nx+ny) % 2 == 0)
{
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