diff options
author | marha <marha@users.sourceforge.net> | 2012-06-08 09:33:13 +0200 |
---|---|---|
committer | marha <marha@users.sourceforge.net> | 2012-06-08 09:33:13 +0200 |
commit | 990bc3f015a4f8fce2eb918375defcd44980a845 (patch) | |
tree | 8e8301f19482b52cc00bd95b4593522cc93267af /libX11/src/xcms/cmsMath.c | |
parent | 1af6fc1b5d93e54d6674de8b5870448b29f139a7 (diff) | |
download | vcxsrv-990bc3f015a4f8fce2eb918375defcd44980a845.tar.gz vcxsrv-990bc3f015a4f8fce2eb918375defcd44980a845.tar.bz2 vcxsrv-990bc3f015a4f8fce2eb918375defcd44980a845.zip |
Used synchronise script to update files
Diffstat (limited to 'libX11/src/xcms/cmsMath.c')
-rw-r--r-- | libX11/src/xcms/cmsMath.c | 272 |
1 files changed, 136 insertions, 136 deletions
diff --git a/libX11/src/xcms/cmsMath.c b/libX11/src/xcms/cmsMath.c index 70b067587..009a623b4 100644 --- a/libX11/src/xcms/cmsMath.c +++ b/libX11/src/xcms/cmsMath.c @@ -1,136 +1,136 @@ - -/* - -Copyright 1990, 1998 The Open Group - -Permission to use, copy, modify, distribute, and sell this software and its -documentation for any purpose is hereby granted without fee, provided that -the above copyright notice appear in all copies and that both that -copyright notice and this permission notice appear in supporting -documentation. - -The above copyright notice and this permission notice shall be included in -all copies or substantial portions of the Software. - -THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR -IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, -FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE -OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN -AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN -CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. - -Except as contained in this notice, the name of The Open Group shall not be -used in advertising or otherwise to promote the sale, use or other dealings -in this Software without prior written authorization from The Open Group. - -*/ - -/* - * Stephen Gildea, MIT X Consortium, January 1991 - */ - -#ifdef HAVE_CONFIG_H -#include <config.h> -#endif -#include "Xlibint.h" -#include "Xcmsint.h" - -#include <float.h> -#ifndef DBL_EPSILON -#define DBL_EPSILON 1e-6 -#endif - -#ifdef _X_ROOT_STATS -int cbrt_loopcount; -int sqrt_loopcount; -#endif - -/* Newton's Method: x_n+1 = x_n - ( f(x_n) / f'(x_n) ) */ - - -/* for cube roots, x^3 - a = 0, x_new = x - 1/3 (x - a/x^2) */ - -double -_XcmsCubeRoot(double a) -{ - register double abs_a, cur_guess, delta; - -#ifdef DEBUG - printf("_XcmsCubeRoot passed in %g\n", a); -#endif -#ifdef _X_ROOT_STATS - cbrt_loopcount = 0; -#endif - if (a == 0.) - return 0.; - - abs_a = a<0. ? -a : a; /* convert to positive to speed loop tests */ - - /* arbitrary first guess */ - if (abs_a > 1.) - cur_guess = abs_a/8.; - else - cur_guess = abs_a*8.; - - do { -#ifdef _X_ROOT_STATS - cbrt_loopcount++; -#endif - delta = (cur_guess - abs_a/(cur_guess*cur_guess))/3.; - cur_guess -= delta; - if (delta < 0.) delta = -delta; - } while (delta >= cur_guess*DBL_EPSILON); - - if (a < 0.) - cur_guess = -cur_guess; - -#ifdef DEBUG - printf("_XcmsCubeRoot returning %g\n", cur_guess); -#endif - return cur_guess; -} - - - -/* for square roots, x^2 - a = 0, x_new = x - 1/2 (x - a/x) */ - -double -_XcmsSquareRoot(double a) -{ - register double cur_guess, delta; - -#ifdef DEBUG - printf("_XcmsSquareRoot passed in %g\n", a); -#endif -#ifdef _X_ROOT_STATS - sqrt_loopcount = 0; -#endif - if (a == 0.) - return 0.; - - if (a < 0.) { - /* errno = EDOM; */ - return 0.; - } - - /* arbitrary first guess */ - if (a > 1.) - cur_guess = a/4.; - else - cur_guess = a*4.; - - do { -#ifdef _X_ROOT_STATS - sqrt_loopcount++; -#endif - delta = (cur_guess - a/cur_guess)/2.; - cur_guess -= delta; - if (delta < 0.) delta = -delta; - } while (delta >= cur_guess*DBL_EPSILON); - -#ifdef DEBUG - printf("_XcmsSquareRoot returning %g\n", cur_guess); -#endif - return cur_guess; -} - +
+/*
+
+Copyright 1990, 1998 The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+
+*/
+
+/*
+ * Stephen Gildea, MIT X Consortium, January 1991
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "Xlibint.h"
+#include "Xcmsint.h"
+
+#include <float.h>
+#ifndef DBL_EPSILON
+#define DBL_EPSILON 1e-6
+#endif
+
+#ifdef _X_ROOT_STATS
+int cbrt_loopcount;
+int sqrt_loopcount;
+#endif
+
+/* Newton's Method: x_n+1 = x_n - ( f(x_n) / f'(x_n) ) */
+
+
+/* for cube roots, x^3 - a = 0, x_new = x - 1/3 (x - a/x^2) */
+
+double
+_XcmsCubeRoot(double a)
+{
+ register double abs_a, cur_guess, delta;
+
+#ifdef DEBUG
+ printf("_XcmsCubeRoot passed in %g\n", a);
+#endif
+#ifdef _X_ROOT_STATS
+ cbrt_loopcount = 0;
+#endif
+ if (a == 0.)
+ return 0.;
+
+ abs_a = a<0. ? -a : a; /* convert to positive to speed loop tests */
+
+ /* arbitrary first guess */
+ if (abs_a > 1.)
+ cur_guess = abs_a/8.;
+ else
+ cur_guess = abs_a*8.;
+
+ do {
+#ifdef _X_ROOT_STATS
+ cbrt_loopcount++;
+#endif
+ delta = (cur_guess - abs_a/(cur_guess*cur_guess))/3.;
+ cur_guess -= delta;
+ if (delta < 0.) delta = -delta;
+ } while (delta >= cur_guess*DBL_EPSILON);
+
+ if (a < 0.)
+ cur_guess = -cur_guess;
+
+#ifdef DEBUG
+ printf("_XcmsCubeRoot returning %g\n", cur_guess);
+#endif
+ return cur_guess;
+}
+
+
+
+/* for square roots, x^2 - a = 0, x_new = x - 1/2 (x - a/x) */
+
+double
+_XcmsSquareRoot(double a)
+{
+ register double cur_guess, delta;
+
+#ifdef DEBUG
+ printf("_XcmsSquareRoot passed in %g\n", a);
+#endif
+#ifdef _X_ROOT_STATS
+ sqrt_loopcount = 0;
+#endif
+ if (a == 0.)
+ return 0.;
+
+ if (a < 0.) {
+ /* errno = EDOM; */
+ return 0.;
+ }
+
+ /* arbitrary first guess */
+ if (a > 1.)
+ cur_guess = a/4.;
+ else
+ cur_guess = a*4.;
+
+ do {
+#ifdef _X_ROOT_STATS
+ sqrt_loopcount++;
+#endif
+ delta = (cur_guess - a/cur_guess)/2.;
+ cur_guess -= delta;
+ if (delta < 0.) delta = -delta;
+ } while (delta >= cur_guess*DBL_EPSILON);
+
+#ifdef DEBUG
+ printf("_XcmsSquareRoot returning %g\n", cur_guess);
+#endif
+ return cur_guess;
+}
+
|