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#include <mbgl/gfx/backend_scope.hpp>
#include <mbgl/gfx/context.hpp>
#include <mbgl/gfx/headless_frontend.hpp>
#include <mbgl/map/map.hpp>
#include <mbgl/map/transform_state.hpp>
#include <mbgl/renderer/renderer.hpp>
#include <mbgl/renderer/renderer_state.hpp>
#include <mbgl/renderer/update_parameters.hpp>
#include <mbgl/util/monotonic_timer.hpp>
#include <mbgl/util/run_loop.hpp>
namespace mbgl {
HeadlessFrontend::HeadlessFrontend(float pixelRatio_,
gfx::HeadlessBackend::SwapBehaviour swapBehavior,
const gfx::ContextMode contextMode,
const optional<std::string> localFontFamily)
: HeadlessFrontend({256, 256}, pixelRatio_, swapBehavior, contextMode, localFontFamily) {}
HeadlessFrontend::HeadlessFrontend(Size size_,
float pixelRatio_,
gfx::HeadlessBackend::SwapBehaviour swapBehavior,
const gfx::ContextMode contextMode,
const optional<std::string> localFontFamily)
: size(size_),
pixelRatio(pixelRatio_),
frameTime(0),
backend(gfx::HeadlessBackend::Create(
{static_cast<uint32_t>(size.width * pixelRatio), static_cast<uint32_t>(size.height * pixelRatio)},
swapBehavior,
contextMode)),
asyncInvalidate([this] {
if (renderer && updateParameters) {
auto startTime = mbgl::util::MonotonicTimer::now();
gfx::BackendScope guard{*getBackend()};
// onStyleImageMissing might be called during a render. The user implemented method
// could trigger a call to MGLRenderFrontend#update which overwrites `updateParameters`.
// Copy the shared pointer here so that the parameters aren't destroyed while `render(...)` is
// still using them.
auto updateParameters_ = updateParameters;
renderer->render(*updateParameters_);
auto endTime = mbgl::util::MonotonicTimer::now();
frameTime = (endTime - startTime).count();
}
}),
renderer(std::make_unique<Renderer>(*getBackend(), pixelRatio, localFontFamily)) {}
HeadlessFrontend::~HeadlessFrontend() = default;
void HeadlessFrontend::reset() {
assert(renderer);
renderer.reset();
}
void HeadlessFrontend::update(std::shared_ptr<UpdateParameters> updateParameters_) {
updateParameters = updateParameters_;
asyncInvalidate.send();
}
void HeadlessFrontend::setObserver(RendererObserver& observer_) {
assert(renderer);
renderer->setObserver(&observer_);
}
double HeadlessFrontend::getFrameTime() const {
return frameTime;
}
Size HeadlessFrontend::getSize() const {
return size;
}
Renderer* HeadlessFrontend::getRenderer() {
assert(renderer);
return renderer.get();
}
gfx::RendererBackend* HeadlessFrontend::getBackend() {
return backend->getRendererBackend();
}
CameraOptions HeadlessFrontend::getCameraOptions() {
if (updateParameters)
return RendererState::getCameraOptions(*updateParameters);
static CameraOptions nullCamera;
return nullCamera;
}
bool HeadlessFrontend::hasImage(const std::string& id) {
if (updateParameters) {
return RendererState::hasImage(*updateParameters, id);
}
return false;
}
bool HeadlessFrontend::hasLayer(const std::string& id) {
if (updateParameters) {
return RendererState::hasLayer(*updateParameters, id);
}
return false;
}
bool HeadlessFrontend::hasSource(const std::string& id) {
if (updateParameters) {
return RendererState::hasSource(*updateParameters, id);
}
return false;
}
ScreenCoordinate HeadlessFrontend::pixelForLatLng(const LatLng& coordinate) {
if (updateParameters) {
return RendererState::pixelForLatLng(*updateParameters, coordinate);
}
return ScreenCoordinate {};
}
LatLng HeadlessFrontend::latLngForPixel(const ScreenCoordinate& point) {
if (updateParameters) {
return RendererState::latLngForPixel(*updateParameters, point);
}
return LatLng {};
}
void HeadlessFrontend::setSize(Size size_) {
if (size != size_) {
size = size_;
backend->setSize({ static_cast<uint32_t>(size_.width * pixelRatio),
static_cast<uint32_t>(size_.height * pixelRatio) });
}
}
PremultipliedImage HeadlessFrontend::readStillImage() {
return backend->readStillImage();
}
HeadlessFrontend::RenderResult HeadlessFrontend::render(Map& map) {
HeadlessFrontend::RenderResult result;
std::exception_ptr error;
map.renderStill([&](std::exception_ptr e) {
if (e) {
error = e;
} else {
result.image = backend->readStillImage();
result.stats = getBackend()->getContext().renderingStats();
}
});
while (!result.image.valid() && !error) {
util::RunLoop::Get()->runOnce();
}
if (error) {
std::rethrow_exception(error);
}
return result;
}
void HeadlessFrontend::renderOnce(Map&) {
util::RunLoop::Get()->runOnce();
}
optional<TransformState> HeadlessFrontend::getTransformState() const {
if (updateParameters) {
return updateParameters->transformState;
} else {
return {};
}
}
} // namespace mbgl
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