def test_outside(self):
     sub_img = create_image((50, 50), color=[100, 120, 130, 140])
     img = SubImageSource(sub_img, size=(100, 100), offset=(200, 0), image_opts=ImageOptions(transparent=True)).as_image()
     eq_(img.getcolors(), [(100*100, (255, 255, 255, 0))])

 def test_negative_offset(self):
     sub_img = create_image((150, 150), color=[100, 120, 130, 140])
     img = SubImageSource(sub_img, size=(100, 100), offset=(-50, 0), image_opts=ImageOptions()).as_image()
     eq_(img.getcolors(), [(100*100, (100, 120, 130, 140))])

 def test_overlap_right(self):
     sub_img = create_image((50, 50), color=[100, 120, 130, 140])
     img = SubImageSource(sub_img, size=(100, 100), offset=(75, 25), image_opts=ImageOptions(transparent=True)).as_image()
     eq_(sorted(img.getcolors()), [(25*50, (100, 120, 130, 140)), (100*100-25*50, (255, 255, 255, 0))])

    def map(self, map_request):
        self.check_map_request(map_request)

        params = map_request.params
        query = MapQuery(params.bbox, params.size, SRS(params.srs), params.format)

        if map_request.params.get('tiled', 'false').lower() == 'true':
            query.tiled_only = True
        orig_query = query

        if self.srs_extents and params.srs in self.srs_extents:
            # limit query to srs_extent if query is larger
            query_extent = MapExtent(params.bbox, SRS(params.srs))
            if not self.srs_extents[params.srs].contains(query_extent):
                limited_extent = self.srs_extents[params.srs].intersection(query_extent)
                if not limited_extent:
                    img_opts = self.image_formats[params.format_mime_type].copy()
                    img_opts.bgcolor = params.bgcolor
                    img_opts.transparent = params.transparent
                    img = BlankImageSource(size=params.size, image_opts=img_opts, cacheable=True)
                    return Response(img.as_buffer(), content_type=img_opts.format.mime_type)
                sub_size, offset, sub_bbox = bbox_position_in_image(params.bbox, params.size, limited_extent.bbox)
                query = MapQuery(sub_bbox, sub_size, SRS(params.srs), params.format)

        actual_layers = odict()
        for layer_name in map_request.params.layers:
            layer = self.layers[layer_name]
            # only add if layer renders the query
            if layer.renders_query(query):
                # if layer is not transparent and will be rendered,
                # remove already added (then hidden) layers
                if not layer.transparent:
                    actual_layers = odict()
                for layer_name, map_layers in layer.map_layers_for_query(query):
                    actual_layers[layer_name] = map_layers

        authorized_layers, coverage = self.authorized_layers('map', actual_layers.keys(),
            map_request.http.environ, query_extent=(query.srs.srs_code, query.bbox))

        self.filter_actual_layers(actual_layers, map_request.params.layers, authorized_layers)

        render_layers = []
        for layers in actual_layers.values():
            render_layers.extend(layers)

        self.update_query_with_fwd_params(query, params=params,
            layers=render_layers)

        raise_source_errors =  True if self.on_error == 'raise' else False
        renderer = LayerRenderer(render_layers, query, map_request,
                                 raise_source_errors=raise_source_errors,
                                 concurrent_rendering=self.concurrent_layer_renderer)

        merger = LayerMerger()
        renderer.render(merger)

        if self.attribution and not query.tiled_only:
            merger.add(attribution_image(self.attribution['text'], query.size))
        img_opts = self.image_formats[params.format_mime_type].copy()
        img_opts.bgcolor = params.bgcolor
        img_opts.transparent = params.transparent
        result = merger.merge(size=query.size, image_opts=img_opts,
            bbox=query.bbox, bbox_srs=params.srs, coverage=coverage)

        if query != orig_query:
            result = SubImageSource(result, size=orig_query.size, offset=offset, image_opts=img_opts)

        # Provide the wrapping WSGI app or filter the opportunity to process the
        # image before it's wrapped up in a response
        result = self.decorate_img(result, 'wms.map', actual_layers.keys(),
            map_request.http.environ, (query.srs.srs_code, query.bbox))

        try:
            result_buf = result.as_buffer(img_opts)
        except IOError, ex:
            raise RequestError('error while processing image file: %s' % ex,
                request=map_request)