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do not invoke supersampling for linear, bicubic and lanczos until the

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* app/core/gimp-transform-region.c: (supersample_dtest): do not invoke
supersampling for linear, bicubic and lanczos until the largest
horizontal/vertical difference between transformed pixel corners goes
above sqrt(2) (this ensures interpolation instead of supersampling is
used for rotation.)

svn path=/trunk/; revision=23509
This commit is contained in:
Øyvind Kolås
2007-09-12 15:36:15 +00:00
parent c39dd1a5b7
commit eaf6052df1
2 changed files with 24 additions and 12 deletions
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28
app/core/gimp-transform-region.c
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@ -897,8 +897,9 @@ sample_bi (TileManager *tm,
/*
* Returns TRUE if one of the deltas of the
* quad edge is > 1.0 (16.16 fixed values).
* Returns TRUE if one of the deltas of the quad edge is > 1.0 (16.16 fixed
* values). This is the condition used on whether additional recursive
* subdivision should be used.
*/
static inline gboolean
supersample_test (gint x0, gint y0,
@ -918,8 +919,10 @@ supersample_test (gint x0, gint y0,
}
/*
* Returns TRUE if one of the deltas of the
* quad edge is > 1.0 (double values).
* Returns TRUE if one of the deltas of the quad edge is > sqrt(2) (double
* values). This is the condition used on whether supersampling should be used
* or not. By making this sqrt(2) supersampling will not be triggered by
* rotations.
*/
static inline gboolean
supersample_dtest (gdouble x0, gdouble y0,
@ -927,15 +930,16 @@ supersample_dtest (gdouble x0, gdouble y0,
gdouble x2, gdouble y2,
gdouble x3, gdouble y3)
{
return (fabs (x0 - x1) > 1.0 ||
fabs (x1 - x2) > 1.0 ||
fabs (x2 - x3) > 1.0 ||
fabs (x3 - x0) > 1.0 ||
#define SQRT2 1.414213562373095
return (fabs (x0 - x1) > SQRT2 ||
fabs (x1 - x2) > SQRT2 ||
fabs (x2 - x3) > SQRT2 ||
fabs (x3 - x0) > SQRT2 ||
fabs (y0 - y1) > 1.0 ||
fabs (y1 - y2) > 1.0 ||
fabs (y2 - y3) > 1.0 ||
fabs (y3 - y0) > 1.0);
fabs (y0 - y1) > SQRT2 ||
fabs (y1 - y2) > SQRT2 ||
fabs (y2 - y3) > SQRT2 ||
fabs (y3 - y0) > SQRT2);
}
/*