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[cairo-traps] Add _cairo_traps_path()

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It appends path for each trap to the path.
This commit is contained in:
Behdad Esfahbod 2008-05-09 15:31:45 +02:00
parent af1e168bbb
commit 674cba89fe
2 changed files with 50 additions and 0 deletions
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46
src/cairo-traps.c
View file

@ -657,3 +657,49 @@ _cairo_traps_extract_region (const cairo_traps_t *traps,
return status;
}
/* moves trap points such that they become the actual corners of the trapezoid */
static void
_sanitize_trap (cairo_trapezoid_t *trap)
{
/* XXX the math here is fragile. can overflow in extreme cases */
#define FIX(t, lr, tb, p) \
if (t->lr.p.y != t->tb) { \
t->lr.p.x = t->lr.p2.x + (t->lr.p1.x - t->lr.p2.x) * (t->tb - t->lr.p2.y) / (t->lr.p1.y - t->lr.p2.y); \
t->lr.p.y = t->tb; \
}
FIX (trap, left, top, p1);
FIX (trap, left, bottom, p2);
FIX (trap, right, top, p1);
FIX (trap, right, bottom, p2);
}
cairo_private cairo_status_t
_cairo_traps_path (const cairo_traps_t *traps,
cairo_path_fixed_t *path)
{
int i;
for (i = 0; i < traps->num_traps; i++) {
cairo_status_t status;
cairo_trapezoid_t trap = traps->traps[i];
if (trap.top == trap.bottom)
continue;
_sanitize_trap (&trap);
status = _cairo_path_fixed_move_to (path, trap.left.p1.x, trap.top);
if (status) return status;
status = _cairo_path_fixed_line_to (path, trap.right.p1.x, trap.top);
if (status) return status;
status = _cairo_path_fixed_line_to (path, trap.right.p2.x, trap.bottom);
if (status) return status;
status = _cairo_path_fixed_line_to (path, trap.left.p2.x, trap.bottom);
if (status) return status;
status = _cairo_path_fixed_close_path (path);
if (status) return status;
}
return CAIRO_STATUS_SUCCESS;
}

4
src/cairoint.h
View file

@ -2140,6 +2140,10 @@ cairo_private cairo_int_status_t
_cairo_traps_extract_region (const cairo_traps_t *tr,
cairo_region_t *region);
cairo_private cairo_status_t
_cairo_traps_path (const cairo_traps_t *traps,
cairo_path_fixed_t *path);
cairo_private void
_cairo_trapezoid_array_translate_and_scale (cairo_trapezoid_t *offset_traps,
cairo_trapezoid_t *src_traps,