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diff a/src/cairo-matrix.c b/src/cairo-matrix.c
--- a/src/cairo-matrix.c
+++ b/src/cairo-matrix.c
@@ -653,16 +653,39 @@ _cairo_matrix_compute_basis_scale_factors (const cairo_matrix_t *matrix,
cairo_bool_t
_cairo_matrix_is_identity (const cairo_matrix_t *matrix)
{
+ static const cairo_matrix_t id = {
+ .xx = 1,
+ .xy = 0,
+ .yx = 0,
+ .yy = 1,
+ .x0 = 0,
+ .y0 = 0
+ };
+
+ return !memcmp(matrix, &id, sizeof(id));
+
+#if 0
return (matrix->xx == 1.0 && matrix->yx == 0.0 &&
matrix->xy == 0.0 && matrix->yy == 1.0 &&
matrix->x0 == 0.0 && matrix->y0 == 0.0);
+#endif
}
cairo_bool_t
_cairo_matrix_is_translation (const cairo_matrix_t *matrix)
{
+ cairo_matrix_t tmp;
+ tmp.xx = matrix->xx;
+ tmp.xy = matrix->xy;
+ tmp.yx = matrix->yx;
+ tmp.yy = matrix->yy;
+ tmp.x0 = tmp.y0 = 0;
+ return _cairo_matrix_is_identity(&tmp);
+
+#if 0
return (matrix->xx == 1.0 && matrix->yx == 0.0 &&
matrix->xy == 0.0 && matrix->yy == 1.0);
+#endif
}
cairo_bool_t
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