[gegl] index bounds for mipmap level 1
- From: Ãyvind KolÃs <ok src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gegl] index bounds for mipmap level 1
- Date: Fri, 1 Jul 2011 03:37:51 +0000 (UTC)
commit 5fbcbd046a7d2110b2fe2abded1e136d01012a63
Author: Nicolas Robidoux <nicolas robidoux gmail com>
Date: Thu Jun 23 16:23:52 2011 -0400
index bounds for mipmap level 1
gegl/buffer/gegl-sampler-lohalo.c | 98 ++++++++++++++++++++++---------------
1 files changed, 59 insertions(+), 39 deletions(-)
---
diff --git a/gegl/buffer/gegl-sampler-lohalo.c b/gegl/buffer/gegl-sampler-lohalo.c
index 362fe1d..5b5b04a 100644
--- a/gegl/buffer/gegl-sampler-lohalo.c
+++ b/gegl/buffer/gegl-sampler-lohalo.c
@@ -214,7 +214,7 @@
* the needed data has been reached:
*/
#define LOHALO_FUDGE ( (gdouble) 1.e-6 )
-#define LOHALO_FUDGE_F ( (gfloat) 1.e-6 )
+#define LOHALO_FUDGEF ( (gfloat) 1.e-6 )
enum
{
@@ -272,7 +272,7 @@ gegl_sampler_lohalo_class_init (GeglSamplerLohaloClass *klass)
* mipmap levels used. On the other hand, large context_rects slow
* things down, since they prevent "buffer reuse."
*/
-#define LOHALO_CONTEXT_RECT_SIZE_1 (5)
+#define LOHALO_CONTEXT_RECT_SIZE_1 (7)
#define LOHALO_CONTEXT_RECT_SHIFT_1 ( ( 1 - (LOHALO_CONTEXT_RECT_SIZE_1) ) / 2 )
static void
@@ -2091,9 +2091,9 @@ gegl_sampler_lohalo_get ( GeglSampler* restrict self,
* Versions which give a bit of wiggle room:
*/
const gfloat fudged_bounding_box_half_width =
- bounding_box_half_width - LOHALO_FUDGE_F;
+ bounding_box_half_width - LOHALO_FUDGEF;
const gfloat fudged_bounding_box_half_height =
- bounding_box_half_height - LOHALO_FUDGE_F;
+ bounding_box_half_height - LOHALO_FUDGEF;
/*
* In order to know whether we use higher mipmap level
@@ -2101,40 +2101,41 @@ gegl_sampler_lohalo_get ( GeglSampler* restrict self,
* mipmap location within the ellipse. So, we need to
* determine the alignment of the level 1 mipmap level
* w.r.t. the current level 0.
- */
-
- /*
+ *
* We use a 5x5 context_rect at level 0; consequently, we
* can access pixels which are 2 away from the anchor pixel
* location in box distance.
- *
+ */
+ /*
* Find the closest locations, on all four sides, of level 1
- * pixels which average data not found in the level 0 5x5:
+ * pixels which average data not found in the level 0 5x5.
*/
+ const gint odd_ix_0 = ix_0 % 2;
+ const gint odd_iy_0 = iy_0 % 2;
const gfloat closest_left_1 =
- (ix_0 % 2) ? (gfloat) -3.5 : (gfloat) -2.5;
+ odd_ix_0 ? (gfloat) -3.5 : (gfloat) -2.5;
const gfloat closest_rite_1 =
- (ix_0 % 2) ? (gfloat) 2.5 : (gfloat) 3.5;
+ odd_ix_0 ? (gfloat) 2.5 : (gfloat) 3.5;
const gfloat closest_top_1 =
- (iy_0 % 2) ? (gfloat) -3.5 : (gfloat) -2.5;
+ odd_iy_0 ? (gfloat) -3.5 : (gfloat) -2.5;
const gfloat closest_bot_1 =
- (iy_0 % 2) ? (gfloat) 2.5 : (gfloat) 3.5;
-
- const gfloat critical_distance = (gfloat) 2.5 + ;
+ odd_iy_0 ? (gfloat) 2.5 : (gfloat) 3.5;
if (
( x_0 - fudged_bounding_box_half_width > closest_left_1 )
&&
( x_0 + fudged_bounding_box_half_width < closest_rite_1 )
&&
- ( y_0 - fudged_bounding_box_half_height > closest_top_1 )
+ ( y_0 - fudged_bounding_box_half_height > closest_top_1 )
&&
- ( y_0 + fudged_bounding_box_half_height < closest_bot_1 )
+ ( y_0 + fudged_bounding_box_half_height < closest_bot_1 )
)
{
/*
- * We definitely don't need data outside of the mipmap
- * level 0 context_rect. Blend and ship out:
+ * We don't need data outside of the level 0
+ * context_rect.
+ *
+ * Blend and ship out:
*/
const gfloat beta = ( (gfloat) 1. - theta ) / total_weight;
newval[0] = theta * newval[0] + beta * ewa_newval[0];
@@ -2148,8 +2149,14 @@ gegl_sampler_lohalo_get ( GeglSampler* restrict self,
{
/*
- * We need higher mipmap level(s) because the ellipse is
- * too big.
+ * We most likely need higher mipmap level(s) because the
+ * bounding box of the ellipse covers mipmap pixel
+ * locations which involve data not "covered" by the 5x5
+ * level 0 context_rect. (The ellipse may still fail to
+ * involve mipmap level 1 values--in which case all mipmap
+ * pixel values will get 0 coefficients--but we used a
+ * quick and dirty bounding box test which lets through
+ * false positives.)
*/
/*
@@ -2157,36 +2164,49 @@ gegl_sampler_lohalo_get ( GeglSampler* restrict self,
*/
const gint ix_1 = LOHALO_FLOORED_DIVISION_BY_2(ix_0);
const gint iy_1 = LOHALO_FLOORED_DIVISION_BY_2(iy_0);
+
/*
- * ADAM: THE POINTER GET NEEDS TO BE HERE.
+ * ADAM: THE POINTER get NEEDS TO BE HERE.
*/
/*
* Position of the sampling location in the coordinate
* system defined by the mipmap "pixel locations" relative
- * to the level 1 anchor pixel location, in "level 1
- * units":
+ * to the level 1 anchor pixel location:
*/
const gfloat x_1 =
- (gfloat) 0.5
- *
- ( (gfloat) ( ix_0 - 2 * ix_1 ) - (gfloat) 0.5 + x_0 );
+ x_0 + (gfloat) ( ix_0 - 2 * ix_1 ) - (gfloat) 0.5;
const gfloat y_1 =
- (gfloat) 0.5
- *
- ( (gfloat) ( iy_0 - 2 * iy_1 ) - (gfloat) 0.5 + y_0 );
+ y_0 + (gfloat) ( iy_0 - 2 * iy_1 ) - (gfloat) 0.5;
+
+ /*
+ * Key index ranges:
+ */
+ const gint in_left_ix_1 = -2 + odd_ix_0;
+ const gint in_rite_ix_1 = 2 - odd_ix_0;
+ const gint in_top_iy_1 = -2 + odd_iy_0;
+ const gint in_bot_iy_1 = 2 - odd_iy_0;
+ const gint out_left_ix_1 =
+ ceilf( ( x_1 - bounding_box_half_width ) * (gfloat) 0.5 );
+ const gint out_rite_ix_1 =
+ floorf( ( x_1 + bounding_box_half_width ) * (gfloat) 0.5 );
+ const gint out_top_iy_1 =
+ ceilf( ( y_1 - bounding_box_half_height ) * (gfloat) 0.5 );
+ const gint out_bot_iy_1 =
+ floorf( ( y_1 + bounding_box_half_height ) * (gfloat) 0.5 );
+
/*
- * The nearest included indices are those at "level 0
- * distance" 2.5 of the level 1 anchor pixel. These
- * correspond to ix_1 - 2
+ * This is where we update using mipmap level 1 values.
*/
- gint i_1 =
-
- /* do */
- /* { */
-
- /* } while */
+ gint i;
+ for ( i = out_top_iy_1; i < in_top_iy_1; i++ )
+ {
+ gint j;
+ for ( j = out_left_1; j <= out_rite_1; j++ )
+ {
+ }
+ }
}
}
}
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