cairo_surface_t *input = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, (int)buf->rect.width(), (int)buf->rect.height());cairo_t *ct = cairo_create(input);cairo_set_source_rgba (ct, 1, 1, 1, 0);cairo_paint(ct);Geom::Rect area = buf->rect;//Gap translate to visual view is workingarea *= Geom::Translate(Geom::Point(20,10));//custom function that render Inkscape rect as cairo surface//Is working because I see the down image translated by area gapsp_canvas_arena_render_surface(SP_CANVAS_ARENA(SP_ACTIVE_DESKTOP->getDrawing()), input, area.roundOutwards());cairo_set_source_surface(ct, input, 0, 0);cairo_paint(ct);cairo_set_operator(ct, CAIRO_OPERATOR_XOR);cairo_rectangle (ct, 40, 30, 120, 90);cairo_set_source_rgba (ct, 0, 0, 0.9, 0.4);cairo_fill_preserve(ct);cairo_set_source_rgba (buf->ct, 1, 1, 1, 0);cairo_paint(buf->ct);cairo_set_source_surface(buf->ct, cairo_get_target(ct), 0, 0);cairo_paint(buf->ct);
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