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lbb resampler tweaks

This commit is contained in:
Nicolas Robidoux 2010-03-28 01:22:23 +00:00
parent e0aa8bf0cb
commit 9e04103bc4
1 changed files with 16 additions and 17 deletions
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33
libvips/resample/lbb.cpp
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@ -295,14 +295,13 @@ lbbicubic( const double c00,
* in later:
*/
const double dble_dzdx00i = dos_thr - dos_one;
const double dble_dzdx10i = dos_fou - dos_two;
const double dble_dzdx01i = tre_thr - tre_one;
const double dble_dzdx11i = tre_fou - tre_two;
const double dble_dzdy00i = tre_two - uno_two;
const double dble_dzdy10i = tre_thr - uno_thr;
const double dble_dzdy01i = qua_two - dos_two;
const double dble_dzdy11i = qua_thr - dos_thr;
const double dble_dzdx10i = dos_fou - dos_two;
const double dble_dzdy01i = qua_two - dos_two;
const double dble_dzdx01i = tre_thr - tre_one;
const double dble_dzdy10i = tre_thr - uno_thr;
const double dble_dzdx11i = tre_fou - tre_two;
const double dble_dzdy00i = tre_two - uno_two;
/*
* Signs of the derivatives. The upcoming clamping does not change
@ -343,24 +342,24 @@ lbbicubic( const double c00,
const double dble_dzdx00 =
( sign_dzdx00 * dble_dzdx00i <= dble_slopelimit_00 )
? dble_dzdx00i : sign_dzdx00 * dble_slopelimit_00;
const double dble_dzdx10 =
( sign_dzdx10 * dble_dzdx10i <= dble_slopelimit_10 )
? dble_dzdx10i : sign_dzdx10 * dble_slopelimit_10;
const double dble_dzdx01 =
( sign_dzdx01 * dble_dzdx01i <= dble_slopelimit_01 )
? dble_dzdx01i : sign_dzdx01 * dble_slopelimit_01;
const double dble_dzdx11 =
( sign_dzdx11 * dble_dzdx11i <= dble_slopelimit_11 )
? dble_dzdx11i : sign_dzdx11 * dble_slopelimit_11;
const double dble_dzdy00 =
( sign_dzdy00 * dble_dzdy00i <= dble_slopelimit_00 )
? dble_dzdy00i : sign_dzdy00 * dble_slopelimit_00;
const double dble_dzdx10 =
( sign_dzdx10 * dble_dzdx10i <= dble_slopelimit_10 )
? dble_dzdx10i : sign_dzdx10 * dble_slopelimit_10;
const double dble_dzdy10 =
( sign_dzdy10 * dble_dzdy10i <= dble_slopelimit_10 )
? dble_dzdy10i : sign_dzdy10 * dble_slopelimit_10;
const double dble_dzdx01 =
( sign_dzdx01 * dble_dzdx01i <= dble_slopelimit_01 )
? dble_dzdx01i : sign_dzdx01 * dble_slopelimit_01;
const double dble_dzdy01 =
( sign_dzdy01 * dble_dzdy01i <= dble_slopelimit_01 )
? dble_dzdy01i : sign_dzdy01 * dble_slopelimit_01;
const double dble_dzdx11 =
( sign_dzdx11 * dble_dzdx11i <= dble_slopelimit_11 )
? dble_dzdx11i : sign_dzdx11 * dble_slopelimit_11;
const double dble_dzdy11 =
( sign_dzdy11 * dble_dzdy11i <= dble_slopelimit_11 )
? dble_dzdy11i : sign_dzdy11 * dble_slopelimit_11;
@ -474,7 +473,7 @@ lbbicubic( const double c00,
c11dxdy * quad_d2zdxdy11;
/*
* Part of the result which only needs first derivatives.
* Twice the part of the result which only needs first derivatives.
*/
const double newval2 = c00dx * dble_dzdx00
+