static cairo_status_t
_combine_region (cairo_surface_t *surface,
const cairo_region_t *region,
const cairo_rectangle_int_t *extents)
{
cairo_region_t clear_region;
cairo_status_t status;
_cairo_region_init_rectangle (&clear_region, extents);
status = cairo_region_subtract (&clear_region, region);
if (unlikely (status))
return status;
if (! cairo_region_is_empty (&clear_region)) {
cairo_region_translate (&clear_region, -extents->x, -extents->y);
status = _cairo_surface_fill_region (surface,
CAIRO_OPERATOR_CLEAR,
CAIRO_COLOR_TRANSPARENT,
&clear_region);
}
_cairo_region_fini (&clear_region);
return status;
}
/* 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;
}
static cairo_surface_t *
_cairo_clip_path_get_surface (cairo_clip_path_t *clip_path,
cairo_surface_t *target)
{
cairo_surface_t *surface;
cairo_pattern_union_t pattern;
cairo_status_t status;
const cairo_rectangle_int_t *clip_extents = &clip_path->extents;
cairo_clip_path_t *prev;
cairo_bool_t need_translate;
if (clip_path->surface != NULL &&
clip_path->surface->backend == target->backend)
{
return cairo_surface_reference (clip_path->surface);
}
surface = _cairo_surface_create_similar_solid (target,
CAIRO_CONTENT_ALPHA,
clip_extents->width,
clip_extents->height,
CAIRO_COLOR_TRANSPARENT,
FALSE);
if (surface == NULL) {
if (clip_path->surface != NULL &&
clip_path->surface->backend == &_cairo_image_surface_backend)
{
return cairo_surface_reference (clip_path->surface);
}
surface =
_cairo_image_surface_create_with_content (CAIRO_CONTENT_ALPHA,
clip_extents->width,
clip_extents->height);
}
if (unlikely (surface->status))
return surface;
_cairo_pattern_init_solid (&pattern.solid,
CAIRO_COLOR_WHITE,
CAIRO_CONTENT_COLOR);
status = _cairo_clip_path_to_region (clip_path);
if (unlikely (_cairo_status_is_error (status)))
goto BAIL;
need_translate = clip_extents->x | clip_extents->y;
if (status == CAIRO_STATUS_SUCCESS) {
if (need_translate) {
cairo_region_translate (clip_path->region,
-clip_extents->x, -clip_extents->y);
}
status = _cairo_surface_fill_region (surface,
CAIRO_OPERATOR_SOURCE,
CAIRO_COLOR_WHITE,
clip_path->region);
if (need_translate) {
cairo_region_translate (clip_path->region,
clip_extents->x, clip_extents->y);
}
if (unlikely (status))
goto BAIL;
goto DONE;
} else {
if (need_translate) {
_cairo_path_fixed_translate (&clip_path->path,
_cairo_fixed_from_int (-clip_extents->x),
_cairo_fixed_from_int (-clip_extents->y));
}
status = _cairo_surface_fill (surface,
CAIRO_OPERATOR_OVER,
&pattern.base,
&clip_path->path,
clip_path->fill_rule,
clip_path->tolerance,
clip_path->antialias,
NULL);
if (need_translate) {
_cairo_path_fixed_translate (&clip_path->path,
_cairo_fixed_from_int (clip_extents->x),
_cairo_fixed_from_int (clip_extents->y));
}
if (unlikely (status))
goto BAIL;
}
prev = clip_path->prev;
NEXT_PATH:
if (prev != NULL) {
status = _cairo_clip_path_to_region (prev);
if (unlikely (_cairo_status_is_error (status)))
goto BAIL;
if (status == CAIRO_STATUS_SUCCESS) {
status = _combine_region (surface, prev->region, clip_extents);
if (unlikely (status))
goto BAIL;
} else if (prev->flags & CAIRO_CLIP_PATH_IS_BOX) {
/* a simple box only affects the extents */
} else if (prev->path.is_rectilinear) {
if (need_translate) {
_cairo_path_fixed_translate (&prev->path,
_cairo_fixed_from_int (-clip_extents->x),
_cairo_fixed_from_int (-clip_extents->y));
}
status = _cairo_surface_fill (surface,
CAIRO_OPERATOR_IN,
&pattern.base,
&prev->path,
prev->fill_rule,
prev->tolerance,
prev->antialias,
NULL);
if (need_translate) {
_cairo_path_fixed_translate (&prev->path,
_cairo_fixed_from_int (clip_extents->x),
_cairo_fixed_from_int (clip_extents->y));
}
if (unlikely (status))
goto BAIL;
prev = prev->prev;
goto NEXT_PATH;
} else {
cairo_surface_t *prev_surface;
prev_surface = _cairo_clip_path_get_surface (prev, target);
_cairo_pattern_init_for_surface (&pattern.surface, prev_surface);
cairo_surface_destroy (prev_surface);
cairo_matrix_init_translate (&pattern.base.matrix,
-prev->extents.x + clip_extents->x,
-prev->extents.y + clip_extents->y);
status = _cairo_surface_paint (surface,
CAIRO_OPERATOR_IN,
&pattern.base,
NULL);
_cairo_pattern_fini (&pattern.base);
if (unlikely (status))
goto BAIL;
}
}
DONE:
cairo_surface_destroy (clip_path->surface);
return clip_path->surface = cairo_surface_reference (surface);
BAIL:
cairo_surface_destroy (surface);
return _cairo_surface_create_in_error (status);
}