static void
_tiling_surface_finish (cairo_surface_t *observer,
cairo_surface_t *target,
void *closure)
{
struct trace *args = closure;
cairo_surface_t *surface;
cairo_content_t content;
cairo_rectangle_t r;
int width, height;
int x, y, w, h;
cairo_recording_surface_get_extents (target, &r);
w = r.width;
h = r.height;
content = cairo_surface_get_content (target);
for (y = 0; y < h; y += args->tile_size) {
height = args->tile_size;
if (y + height > h)
height = h - y;
for (x = 0; x < w; x += args->tile_size) {
cairo_t *cr;
width = args->tile_size;
if (x + width > w)
width = w - x;
/* XXX to correctly observe the playback we would need
* to replay the target onto the observer directly.
*/
surface = args->target->create_similar (args->surface,
content, width, height);
cr = cairo_create (surface);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_surface (cr, target, -x, -y);
cairo_paint (cr);
cairo_destroy (cr);
cairo_surface_destroy (surface);
}
}
}
void render(cairo_fill_rule_t fill_rule, cairo_context & context)
{
value_double opacity = get<value_double, keys::opacity>(sym_, feature_, common_.vars_);
agg::trans_affine image_tr = agg::trans_affine_scaling(common_.scale_factor_);
auto image_transform = get_optional<transform_type>(sym_, keys::image_transform);
if (image_transform)
{
evaluate_transform(image_tr, feature_, common_.vars_, *image_transform, common_.scale_factor_);
}
composite_mode_e comp_op = get<composite_mode_e, keys::comp_op>(sym_, feature_, common_.vars_);
cairo_save_restore guard(context);
context.set_operator(comp_op);
cairo_renderer_process_visitor_p visitor(image_tr, opacity);
cairo_surface_ptr surface(util::apply_visitor(visitor, this->marker_));
coord<double, 2> offset(0, 0);
cairo_rectangle_t pattern_surface_extent;
if (cairo_recording_surface_get_extents(surface.get(), &pattern_surface_extent))
{
offset = pattern_offset(sym_, feature_, prj_trans_, common_,
pattern_surface_extent.width, pattern_surface_extent.height);
}
cairo_pattern pattern(surface);
pattern.set_extend(CAIRO_EXTEND_REPEAT);
pattern.set_origin(-offset.x, -offset.y);
context.set_pattern(pattern);
using apply_vertex_converter_type = detail::apply_vertex_converter<VertexConverter, cairo_context>;
using vertex_processor_type = geometry::vertex_processor<apply_vertex_converter_type>;
apply_vertex_converter_type apply(converter_, context);
mapnik::util::apply_visitor(vertex_processor_type(apply),feature_.get_geometry());
// fill polygon
context.set_fill_rule(fill_rule);
context.fill();
}
