本文整理汇总了C++中mapnik::feature_impl::get_raster方法的典型用法代码示例。如果您正苦于以下问题：C++ feature_impl::get_raster方法的具体用法？C++ feature_impl::get_raster怎么用？C++ feature_impl::get_raster使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类mapnik::feature_impl的用法示例。
在下文中一共展示了feature_impl::get_raster方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: target_data
void agg_renderer<T>::process(raster_symbolizer const& sym,
mapnik::feature_impl & feature,
proj_transform const& prj_trans)
{
raster_ptr const& source = feature.get_raster();
if (source)
{
// If there's a colorizer defined, use it to color the raster in-place
raster_colorizer_ptr colorizer = sym.get_colorizer();
if (colorizer)
colorizer->colorize(source,feature);
box2d<double> target_ext = box2d<double>(source->ext_);
prj_trans.backward(target_ext, PROJ_ENVELOPE_POINTS);
box2d<double> ext = t_.forward(target_ext);
int start_x = static_cast<int>(ext.minx());
int start_y = static_cast<int>(ext.miny());
int end_x = static_cast<int>(ceil(ext.maxx()));
int end_y = static_cast<int>(ceil(ext.maxy()));
int raster_width = end_x - start_x;
int raster_height = end_y - start_y;
if (raster_width > 0 && raster_height > 0)
{
image_data_32 target_data(raster_width,raster_height);
raster target(target_ext, target_data);
scaling_method_e scaling_method = sym.get_scaling_method();
double filter_radius = sym.calculate_filter_factor();
double offset_x = ext.minx() - start_x;
double offset_y = ext.miny() - start_y;
if (!prj_trans.equal())
{
reproject_and_scale_raster(target, *source, prj_trans,
offset_x, offset_y,
sym.get_mesh_size(),
filter_radius,
scaling_method);
}
else
{
if (scaling_method == SCALING_BILINEAR8){
scale_image_bilinear8<image_data_32>(target.data_,source->data_, offset_x, offset_y);
} else {
double scaling_ratio = ext.width() / source->data_.width();
scale_image_agg<image_data_32>(target.data_,
source->data_,
scaling_method,
scaling_ratio,
offset_x,
offset_y,
filter_radius);
}
}
composite(current_buffer_->data(), target.data_, sym.comp_op(), sym.get_opacity(), start_x, start_y, true);
}
}
}示例2: target
void agg_renderer<T>::process(raster_symbolizer const& sym,
mapnik::feature_impl & feature,
proj_transform const& prj_trans)
{
raster_ptr const& source = feature.get_raster();
if (source)
{
// If there's a colorizer defined, use it to color the raster in-place
raster_colorizer_ptr colorizer = sym.get_colorizer();
if (colorizer)
colorizer->colorize(source,feature);
box2d<double> target_ext = box2d<double>(source->ext_);
prj_trans.backward(target_ext, PROJ_ENVELOPE_POINTS);
box2d<double> ext = t_.forward(target_ext);
int start_x = static_cast<int>(std::floor(ext.minx()+.5));
int start_y = static_cast<int>(std::floor(ext.miny()+.5));
int end_x = static_cast<int>(std::floor(ext.maxx()+.5));
int end_y = static_cast<int>(std::floor(ext.maxy()+.5));
int raster_width = end_x - start_x;
int raster_height = end_y - start_y;
if (raster_width > 0 && raster_height > 0)
{
raster target(target_ext, raster_width,raster_height);
scaling_method_e scaling_method = sym.get_scaling_method();
double filter_radius = sym.calculate_filter_factor();
bool premultiply_source = !source->premultiplied_alpha_;
boost::optional<bool> is_premultiplied = sym.premultiplied();
if (is_premultiplied)
{
if (*is_premultiplied) premultiply_source = false;
else premultiply_source = true;
}
if (premultiply_source)
{
agg::rendering_buffer buffer(source->data_.getBytes(),
source->data_.width(),
source->data_.height(),
source->data_.width() * 4);
agg::pixfmt_rgba32 pixf(buffer);
pixf.premultiply();
}
if (!prj_trans.equal())
{
double offset_x = ext.minx() - start_x;
double offset_y = ext.miny() - start_y;
reproject_and_scale_raster(target, *source, prj_trans,
offset_x, offset_y,
sym.get_mesh_size(),
filter_radius,
scaling_method);
}
else
{
if (scaling_method == SCALING_BILINEAR8)
{
scale_image_bilinear8<image_data_32>(target.data_,
source->data_,
0.0,
0.0);
}
else
{
double image_ratio_x = ext.width() / source->data_.width();
double image_ratio_y = ext.height() / source->data_.height();
scale_image_agg<image_data_32>(target.data_,
source->data_,
scaling_method,
image_ratio_x,
image_ratio_y,
0.0,
0.0,
filter_radius);
}
}
composite(current_buffer_->data(), target.data_,
sym.comp_op(), sym.get_opacity(),
start_x, start_y, false);
}
}
}