diff options
Diffstat (limited to 'src/cairo_traps.c')
| -rw-r--r-- | src/cairo_traps.c | 41 |
1 files changed, 39 insertions, 2 deletions
diff --git a/src/cairo_traps.c b/src/cairo_traps.c index 63df3ea4..9b44d38e 100644 --- a/src/cairo_traps.c +++ b/src/cairo_traps.c @@ -58,7 +58,7 @@ _compute_inverse_slope (cairo_line_t *l); static double _compute_x_intercept (cairo_line_t *l, double inverse_slope); -static cairo_fixed_t +static int _line_segs_intersect_ceil (cairo_line_t *left, cairo_line_t *right, cairo_fixed_t *y_ret); void @@ -490,7 +490,7 @@ _line_segs_intersect_ceil (cairo_line_t *l1, cairo_line_t *l2, cairo_fixed_t *y_ */ cairo_status_t _cairo_traps_tessellate_polygon (cairo_traps_t *traps, - cairo_polygon_t *poly, + cairo_polygon_t *poly, cairo_fill_rule_t fill_rule) { cairo_status_t status; @@ -608,3 +608,40 @@ _cairo_traps_contain (cairo_traps_t *traps, double x, double y) return 0; } + +#define MIN(a,b) ((a) < (b) ? (a) : (b)) +#define MAX(a,b) ((a) > (b) ? (a) : (b)) + +static void +_cairo_trap_extents (cairo_trapezoid_t *t, cairo_box_t *extents) +{ + cairo_fixed_t x; + + if (t->top < extents->p1.y) + extents->p1.y = t->top; + + if (t->bottom > extents->p2.y) + extents->p2.y = t->bottom; + + x = MIN (_compute_x (&t->left, t->top), + _compute_x (&t->left, t->bottom)); + if (x < extents->p1.x) + extents->p1.x = x; + + x = MAX (_compute_x (&t->right, t->top), + _compute_x (&t->right, t->bottom)); + if (x > extents->p2.x) + extents->p2.x = x; +} + +void +_cairo_traps_extents (cairo_traps_t *traps, cairo_box_t *extents) +{ + int i; + + extents->p1.x = extents->p1.y = SHRT_MAX << 16; + extents->p2.x = extents->p2.y = SHRT_MIN << 16; + + for (i = 0; i < traps->num_traps; i++) + _cairo_trap_extents (&traps->traps[i], extents); +} |