Attachment 2985 Details for Bug 4188 – remove cairo_matrix_compute_eigenvalues

[patch] remove cairo_matrix_compute_eigenvalues

cairo-remove-cairo-matrix-compute-eigen-values.diff (text/plain), 1.89 KB, created by Bertram Felgenhauer on 2005-08-22 11:25:19 UTC

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Creator: Bertram Felgenhauer

Created: 2005-08-22 11:25:19 UTC

Size: 1.89 KB

patch

obsolete

>Index: src/cairo-matrix.c
>===================================================================
>RCS file: /cvs/cairo/cairo/src/cairo-matrix.c,v
>retrieving revision 1.30
>diff -u -r1.30 cairo-matrix.c
>--- src/cairo-matrix.c	5 Aug 2005 17:05:29 -0000	1.30
>+++ src/cairo-matrix.c	22 Aug 2005 17:51:09 -0000
>@@ -484,37 +484,6 @@
>     *det = a*d - b*c;
> }
> 
>-void
>-_cairo_matrix_compute_eigen_values (const cairo_matrix_t *matrix,
>-				    double *lambda1, double *lambda2)
>-{
>-    /* The eigenvalues of an NxN matrix M are found by solving the polynomial:
>-
>-       det (M - lI) = 0
>-
>-       The zeros in our homogeneous 3x3 matrix make this equation equal
>-       to that formed by the sub-matrix:
>-
>-       M = a b 
>-           c d
>-
>-       by which:
>-
>-       l^2 - (a+d)l + (ad - bc) = 0
>-
>-       l = (a+d +/- sqrt (a^2 + 2ad + d^2 - 4 (ad-bc))) / 2;
>-    */
>-
>-    double a, b, c, d, rad;
>-
>-    a = matrix->xx; b = matrix->yx;
>-    c = matrix->xy; d = matrix->yy;
>-
>-    rad = sqrt (a*a + 2*a*d + d*d - 4*(a*d - b*c));
>-    *lambda1 = (a + d + rad) / 2.0;
>-    *lambda2 = (a + d - rad) / 2.0;
>-}
>-
> /* Compute the amount that each basis vector is scaled by. */
> cairo_status_t
> _cairo_matrix_compute_scale_factors (const cairo_matrix_t *matrix,
>Index: src/cairoint.h
>===================================================================
>RCS file: /cvs/cairo/cairo/src/cairoint.h,v
>retrieving revision 1.202
>diff -u -r1.202 cairoint.h
>--- src/cairoint.h	22 Aug 2005 04:04:52 -0000	1.202
>+++ src/cairoint.h	22 Aug 2005 17:51:10 -0000
>@@ -1854,10 +1854,6 @@
> cairo_private void
> _cairo_matrix_compute_determinant (const cairo_matrix_t *matrix, double *det);
> 
>-cairo_private void
>-_cairo_matrix_compute_eigen_values (const cairo_matrix_t *matrix,
>-				    double *lambda1, double *lambda2);
>-
> cairo_private cairo_status_t
> _cairo_matrix_compute_scale_factors (const cairo_matrix_t *matrix,
> 				     double *sx, double *sy, int x_major);

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