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traps: The CompositeTrapezoids requires the unbounded fixup for clipping

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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2012-03-06 21:03:02 +00:00
parent 753007ea00
commit ad758280b6
1 changed files with 69 additions and 1 deletions
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70
src/cairo-traps-compositor.c
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@ -153,6 +153,21 @@ static void blt_in(void *closure,
&info->boxes);
}
static void
add_rect_with_offset (cairo_boxes_t *boxes, int x1, int y1, int x2, int y2, int dx, int dy)
{
cairo_box_t box;
cairo_int_status_t status;
box.p1.x = _cairo_fixed_from_int (x1 - dx);
box.p1.y = _cairo_fixed_from_int (y1 - dy);
box.p2.x = _cairo_fixed_from_int (x2 - dx);
box.p2.y = _cairo_fixed_from_int (y2 - dy);
status = _cairo_boxes_add (boxes, CAIRO_ANTIALIAS_DEFAULT, &box);
assert (status == CAIRO_INT_STATUS_SUCCESS);
}
static cairo_int_status_t
combine_clip_as_traps (const cairo_traps_compositor_t *compositor,
cairo_surface_t *mask,
@ -164,6 +179,8 @@ combine_clip_as_traps (const cairo_traps_compositor_t *compositor,
cairo_antialias_t antialias;
cairo_traps_t traps;
cairo_surface_t *src;
cairo_box_t box;
cairo_rectangle_int_t fixup;
int src_x, src_y;
cairo_int_status_t status;
@ -196,8 +213,59 @@ combine_clip_as_traps (const cairo_traps_compositor_t *compositor,
extents,
antialias, &traps);
cairo_surface_destroy (src);
_cairo_traps_extents (&traps, &box);
_cairo_box_round_to_rectangle (&box, &fixup);
_cairo_traps_fini (&traps);
cairo_surface_destroy (src);
if (status == CAIRO_INT_STATUS_SUCCESS &&
(fixup.width < extents->width || fixup.height < extents->height)) {
cairo_boxes_t clear;
_cairo_boxes_init (&clear);
/* top */
if (fixup.y != extents->y) {
add_rect_with_offset (&clear,
extents->x, extents->y,
extents->x + extents->width,
fixup.y,
extents->x, extents->y);
}
/* left */
if (fixup.x != extents->x) {
add_rect_with_offset (&clear,
extents->x, fixup.y,
fixup.x,
fixup.y + fixup.height,
extents->x, extents->y);
}
/* right */
if (fixup.x + fixup.width != extents->x + extents->width) {
add_rect_with_offset (&clear,
fixup.x + fixup.width,
fixup.y,
extents->x + extents->width,
fixup.y + fixup.height,
extents->x, extents->y);
}
/* bottom */
if (fixup.y + fixup.height != extents->y + extents->height) {
add_rect_with_offset (&clear,
extents->x,
fixup.y + fixup.height,
extents->x + extents->width,
extents->y + extents->height,
extents->x, extents->y);
}
status = compositor->fill_boxes (mask,
CAIRO_OPERATOR_CLEAR,
CAIRO_COLOR_TRANSPARENT,
&clear);
_cairo_boxes_fini (&clear);
}
return status;
}