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#include <mbgl/map/map_snapshotter.hpp>
#include <mbgl/actor/actor_ref.hpp>
#include <mbgl/gl/headless_frontend.hpp>
#include <mbgl/map/map.hpp>
#include <mbgl/map/transform_state.hpp>
#include <mbgl/storage/file_source.hpp>
#include <mbgl/style/style.hpp>
#include <mbgl/util/event.hpp>
#include <mbgl/map/transform.hpp>
namespace mbgl {
class MapSnapshotter::Impl {
public:
Impl(FileSource&,
Scheduler&,
const std::string& styleURL,
const Size&,
const float pixelRatio,
const CameraOptions&,
const optional<LatLngBounds> region,
const optional<std::string> programCacheDir);
void setStyleURL(std::string styleURL);
std::string getStyleURL() const;
void setSize(Size);
Size getSize() const;
void setCameraOptions(CameraOptions);
CameraOptions getCameraOptions() const;
void setRegion(LatLngBounds);
LatLngBounds getRegion() const;
void snapshot(ActorRef<MapSnapshotter::Callback>);
private:
HeadlessFrontend frontend;
Map map;
};
MapSnapshotter::Impl::Impl(FileSource& fileSource,
Scheduler& scheduler,
const std::string& styleURL,
const Size& size,
const float pixelRatio,
const CameraOptions& cameraOptions,
const optional<LatLngBounds> region,
const optional<std::string> programCacheDir)
: frontend(size, pixelRatio, fileSource, scheduler, programCacheDir)
, map(frontend, MapObserver::nullObserver(), size, pixelRatio, fileSource, scheduler, MapMode::Still) {
map.getStyle().loadURL(styleURL);
map.jumpTo(cameraOptions);
// Set region, if specified
if (region) {
this->setRegion(*region);
}
}
void MapSnapshotter::Impl::snapshot(ActorRef<MapSnapshotter::Callback> callback) {
map.renderStill([this, callback = std::move(callback)] (std::exception_ptr error) mutable {
// Create lambda that captures the current transform state
// and can be used to translate for geographic to screen
// coordinates
assert (frontend.getTransformState());
PointForFn pointForFn { [=, center=map.getLatLng(), transformState = *frontend.getTransformState()] (const LatLng& latLng) {
LatLng unwrappedLatLng = latLng.wrapped();
unwrappedLatLng.unwrapForShortestPath(center);
Transform transform { transformState };
return transform.latLngToScreenCoordinate(unwrappedLatLng);
}};
// Collect all source attributions
std::vector<std::string> attributions;
for (auto source : map.getStyle().getSources()) {
auto attribution = source->getAttribution();
if (attribution) {
attributions.push_back(*attribution);
}
}
// Invoke callback
callback.invoke(
&MapSnapshotter::Callback::operator(),
error,
error ? PremultipliedImage() : frontend.readStillImage(),
std::move(attributions),
std::move(pointForFn)
);
});
}
void MapSnapshotter::Impl::setStyleURL(std::string styleURL) {
map.getStyle().loadURL(styleURL);
}
std::string MapSnapshotter::Impl::getStyleURL() const {
return map.getStyle().getURL();
}
void MapSnapshotter::Impl::setSize(Size size) {
map.setSize(size);
frontend.setSize(size);
}
Size MapSnapshotter::Impl::getSize() const {
return map.getSize();
}
void MapSnapshotter::Impl::setCameraOptions(CameraOptions cameraOptions) {
map.jumpTo(cameraOptions);
}
CameraOptions MapSnapshotter::Impl::getCameraOptions() const {
EdgeInsets insets;
return map.getCameraOptions(insets);
}
void MapSnapshotter::Impl::setRegion(LatLngBounds region) {
mbgl::EdgeInsets insets = { 0, 0, 0, 0 };
std::vector<LatLng> latLngs = { region.southwest(), region.northeast() };
map.jumpTo(map.cameraForLatLngs(latLngs, insets));
}
LatLngBounds MapSnapshotter::Impl::getRegion() const {
return map.latLngBoundsForCamera(getCameraOptions());
}
MapSnapshotter::MapSnapshotter(FileSource& fileSource,
Scheduler& scheduler,
const std::string& styleURL,
const Size& size,
const float pixelRatio,
const CameraOptions& cameraOptions,
const optional<LatLngBounds> region,
const optional<std::string> programCacheDir)
: impl(std::make_unique<util::Thread<MapSnapshotter::Impl>>("Map Snapshotter", fileSource, scheduler, styleURL, size, pixelRatio, cameraOptions, region, programCacheDir)) {
}
MapSnapshotter::~MapSnapshotter() = default;
void MapSnapshotter::snapshot(ActorRef<MapSnapshotter::Callback> callback) {
impl->actor().invoke(&Impl::snapshot, std::move(callback));
}
void MapSnapshotter::setStyleURL(const std::string& styleURL) {
impl->actor().invoke(&Impl::setStyleURL, styleURL);
}
std::string MapSnapshotter::getStyleURL() const {
return impl->actor().ask(&Impl::getStyleURL).get();
}
void MapSnapshotter::setSize(const Size& size) {
impl->actor().invoke(&Impl::setSize, size);
}
Size MapSnapshotter::getSize() const {
return impl->actor().ask(&Impl::getSize).get();
}
void MapSnapshotter::setCameraOptions(const CameraOptions& options) {
impl->actor().invoke(&Impl::setCameraOptions, options);
}
CameraOptions MapSnapshotter::getCameraOptions() const {
return impl->actor().ask(&Impl::getCameraOptions).get();
}
void MapSnapshotter::setRegion(const LatLngBounds& bounds) {
impl->actor().invoke(&Impl::setRegion, std::move(bounds));
}
LatLngBounds MapSnapshotter::getRegion() const {
return impl->actor().ask(&Impl::getRegion).get();
}
} // namespace mbgl
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