cairo_status_t
_cairo_clip_intersect_to_rectangle (cairo_clip_t *clip,
cairo_rectangle_int_t *rectangle)
{
if (!clip)
return CAIRO_STATUS_SUCCESS;
if (clip->all_clipped) {
*rectangle = clip->surface_rect;
return CAIRO_STATUS_SUCCESS;
}
if (clip->path) {
cairo_status_t status;
status = _cairo_clip_path_intersect_to_rectangle (clip->path,
rectangle);
if (status)
return status;
}
if (clip->has_region) {
cairo_status_t status = CAIRO_STATUS_SUCCESS;
cairo_region_t intersection;
_cairo_region_init_rect (&intersection, rectangle);
status = _cairo_region_intersect (&intersection, &clip->region,
&intersection);
if (!status)
_cairo_region_get_extents (&intersection, rectangle);
_cairo_region_fini (&intersection);
if (status)
return status;
}
if (clip->surface)
_cairo_rectangle_intersect (rectangle, &clip->surface_rect);
return CAIRO_STATUS_SUCCESS;
}
cairo_status_t
_cairo_clip_intersect_to_rectangle (cairo_clip_t *clip,
cairo_rectangle_int_t *rectangle)
{
cairo_status_t status;
cairo_bool_t is_empty;
if (!clip)
return CAIRO_STATUS_SUCCESS;
if (clip->all_clipped) {
*rectangle = clip->surface_rect;
return CAIRO_STATUS_SUCCESS;
}
if (clip->path) {
status = _cairo_clip_path_intersect_to_rectangle (clip->path,
rectangle);
if (unlikely (status))
return status;
}
if (clip->has_region) {
cairo_rectangle_int_t extents;
_cairo_region_get_extents (&clip->region, &extents);
is_empty = _cairo_rectangle_intersect (rectangle, &extents);
if (is_empty)
return CAIRO_STATUS_SUCCESS;
}
if (clip->surface)
is_empty = _cairo_rectangle_intersect (rectangle, &clip->surface_rect);
return CAIRO_STATUS_SUCCESS;
}
/* Warning: This call modifies the coordinates of traps */
static cairo_status_t
_clip_and_composite_trapezoids (cairo_pattern_t *src,
cairo_operator_t op,
cairo_surface_t *dst,
cairo_traps_t *traps,
cairo_clip_t *clip,
cairo_antialias_t antialias)
{
cairo_status_t status;
cairo_region_t trap_region;
cairo_region_t clear_region;
cairo_bool_t has_trap_region = FALSE;
cairo_bool_t has_clear_region = FALSE;
cairo_rectangle_int_t extents;
cairo_composite_traps_info_t traps_info;
if (traps->num_traps == 0)
return CAIRO_STATUS_SUCCESS;
status = _cairo_surface_get_extents (dst, &extents);
if (status)
return status;
status = _cairo_traps_extract_region (traps, &trap_region);
if (CAIRO_INT_STATUS_UNSUPPORTED == status) {
has_trap_region = FALSE;
} else if (status) {
return status;
} else {
has_trap_region = TRUE;
}
if (_cairo_operator_bounded_by_mask (op)) {
cairo_rectangle_int_t trap_extents;
if (has_trap_region) {
status = _cairo_clip_intersect_to_region (clip, &trap_region);
if (status)
goto out;
_cairo_region_get_extents (&trap_region, &trap_extents);
} else {
cairo_box_t trap_box;
_cairo_traps_extents (traps, &trap_box);
_cairo_box_round_to_rectangle (&trap_box, &trap_extents);
}
_cairo_rectangle_intersect (&extents, &trap_extents);
status = _cairo_clip_intersect_to_rectangle (clip, &extents);
if (status)
goto out;
} else {
cairo_surface_t *clip_surface = clip ? clip->surface : NULL;
if (has_trap_region && !clip_surface) {
/* If we optimize drawing with an unbounded operator to
* _cairo_surface_fill_rectangles() or to drawing with a
* clip region, then we have an additional region to clear.
*/
_cairo_region_init_rect (&clear_region, &extents);
has_clear_region = TRUE;
status = _cairo_clip_intersect_to_region (clip, &clear_region);
if (status)
goto out;
_cairo_region_get_extents (&clear_region, &extents);
status = _cairo_region_subtract (&clear_region, &clear_region, &trap_region);
if (status)
goto out;
if (!_cairo_region_not_empty (&clear_region)) {
_cairo_region_fini (&clear_region);
has_clear_region = FALSE;
}
} else {
status = _cairo_clip_intersect_to_rectangle (clip, &extents);
}
}
if (status)
goto out;
if (has_trap_region) {
cairo_surface_t *clip_surface = clip ? clip->surface : NULL;
if ((src->type == CAIRO_PATTERN_TYPE_SOLID ||
op == CAIRO_OPERATOR_CLEAR) && !clip_surface) {
const cairo_color_t *color;
if (op == CAIRO_OPERATOR_CLEAR) {
color = CAIRO_COLOR_TRANSPARENT;
} else {
color = &((cairo_solid_pattern_t *)src)->color;
}
/* Solid rectangles special case */
status = _cairo_surface_fill_region (dst, op, color, &trap_region);
if (!status && has_clear_region)
status = _cairo_surface_fill_region (dst, CAIRO_OPERATOR_CLEAR,
CAIRO_COLOR_TRANSPARENT,
&clear_region);
goto out;
}
if ((_cairo_operator_bounded_by_mask (op) &&
op != CAIRO_OPERATOR_SOURCE) || !clip_surface) {
/* For a simple rectangle, we can just use composite(), for more
* rectangles, we have to set a clip region. The cost of rasterizing
* trapezoids is pretty high for most backends currently, so it's
* worthwhile even if a region is needed.
*
* If we have a clip surface, we set it as the mask; this only works
* for bounded operators other than SOURCE; for unbounded operators,
* clip and mask cannot be interchanged. For SOURCE, the operator
* as implemented by the backends is different in it's handling
* of the mask then what we want.
*
* CAIRO_INT_STATUS_UNSUPPORTED will be returned if the region has
* more than rectangle and the destination doesn't support clip
* regions. In that case, we fall through.
*/
status = _composite_trap_region (clip, src, op, dst,
&trap_region, &extents);
if (status != CAIRO_INT_STATUS_UNSUPPORTED) {
if (!status && has_clear_region)
status = _cairo_surface_fill_region (dst, CAIRO_OPERATOR_CLEAR,
CAIRO_COLOR_TRANSPARENT,
&clear_region);
goto out;
}
}
}
traps_info.traps = traps;
traps_info.antialias = antialias;
status = _clip_and_composite (clip, op, src,
_composite_traps_draw_func,
&traps_info, dst, &extents);
out:
if (has_trap_region)
_cairo_region_fini (&trap_region);
if (has_clear_region)
_cairo_region_fini (&clear_region);
return status;
}