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[matrix] Impose a maximum number of refinement iterations

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Ensure we do not loop forever trying to minimise the error between the
pixman and cairo matrices - for instance when the FPU is not running at
full precision.
This commit is contained in:
Chris Wilson 2008-11-26 13:26:40 +00:00
parent 4218699642
commit 8a5b55ca6c
1 changed files with 3 additions and 1 deletions
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4
src/cairo-matrix.c
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@ -879,6 +879,7 @@ _cairo_matrix_to_pixman_matrix (const cairo_matrix_t *matrix,
*pixman_transform = pixman_identity_transform;
} else {
cairo_matrix_t inv;
unsigned max_iterations;
pixman_transform->matrix[0][0] = _cairo_fixed_16_16_from_double (matrix->xx);
pixman_transform->matrix[0][1] = _cairo_fixed_16_16_from_double (matrix->xy);
@ -913,6 +914,7 @@ _cairo_matrix_to_pixman_matrix (const cairo_matrix_t *matrix,
/* find the pattern space coordinate that maps to (xc, yc) */
xc += .5; yc += .5; /* offset for the pixel centre */
max_iterations = 5;
do {
double x,y;
pixman_vector_t vector;
@ -942,6 +944,6 @@ _cairo_matrix_to_pixman_matrix (const cairo_matrix_t *matrix,
if (dx == 0 && dy == 0)
break;
} while (TRUE);
} while (--max_iterations);
}
}