2 files changed, 111 insertions, 0 deletions
diff --git a/platform/default/include/mbgl/gl/headless_backend.hpp b/platform/default/include/mbgl/gl/headless_backend.hpp
new file mode 100644
index 0000000000..7757037533
--- /dev/null
+++ b/platform/default/include/mbgl/gl/headless_backend.hpp
@@ -0,0 +1,50 @@
+#pragma once
+
+#include <mbgl/renderer/renderer_backend.hpp>
+
+#include <memory>
+#include <functional>
+
+namespace mbgl {
+
+class HeadlessBackend : public RendererBackend {
+public:
+    HeadlessBackend(Size = { 256, 256 });
+    ~HeadlessBackend() override;
+
+    void bind() override;
+    Size getFramebufferSize() const override;
+    void updateAssumedState() override;
+
+    void setSize(Size);
+    PremultipliedImage readStillImage();
+
+    class Impl {
+    public:
+        virtual ~Impl() = default;
+        virtual gl::ProcAddress getExtensionFunctionPointer(const char*) = 0;
+        virtual void activateContext() = 0;
+        virtual void deactivateContext() {}
+    };
+
+private:
+    // Implementation specific functions
+    gl::ProcAddress getExtensionFunctionPointer(const char*) override;
+
+    void activate() override;
+    void deactivate() override;
+
+    void createImpl();
+
+private:
+    std::unique_ptr<Impl> impl;
+
+    Size size;
+    float pixelRatio;
+    bool active = false;
+
+    class View;
+    std::unique_ptr<View> view;
+};
+
+} // namespace mbgl
diff --git a/platform/default/include/mbgl/gl/headless_frontend.hpp b/platform/default/include/mbgl/gl/headless_frontend.hpp
new file mode 100644
index 0000000000..18f0cfa537
--- /dev/null
+++ b/platform/default/include/mbgl/gl/headless_frontend.hpp
@@ -0,0 +1,61 @@
+#pragma once
+
+#include <mbgl/map/camera.hpp>
+#include <mbgl/renderer/mode.hpp>
+#include <mbgl/renderer/renderer_frontend.hpp>
+#include <mbgl/gl/headless_backend.hpp>
+#include <mbgl/util/async_task.hpp>
+#include <mbgl/util/optional.hpp>
+
+#include <memory>
+
+namespace mbgl {
+
+class FileSource;
+class Scheduler;
+class Renderer;
+class RendererBackend;
+class Map;
+class TransformState;
+
+class HeadlessFrontend : public RendererFrontend {
+public:
+    HeadlessFrontend(float pixelRatio_, FileSource&, Scheduler&, const optional<std::string> programCacheDir = {}, GLContextMode mode = GLContextMode::Unique, const optional<std::string> localFontFamily = {});
+    HeadlessFrontend(Size, float pixelRatio_, FileSource&, Scheduler&, const optional<std::string> programCacheDir = {}, GLContextMode mode = GLContextMode::Unique, const optional<std::string> localFontFamily = {});
+    ~HeadlessFrontend() override;
+
+    void reset() override;
+    void update(std::shared_ptr<UpdateParameters>) override;
+    void setObserver(RendererObserver&) override;
+
+    Size getSize() const;
+    void setSize(Size);
+
+    Renderer* getRenderer();
+    RendererBackend* getBackend();
+    CameraOptions getCameraOptions();
+
+    bool hasImage(const std::string&);
+    bool hasLayer(const std::string&);
+    bool hasSource(const std::string&);
+
+    ScreenCoordinate pixelForLatLng(const LatLng&);
+    LatLng latLngForPixel(const ScreenCoordinate&);
+
+    PremultipliedImage readStillImage();
+    PremultipliedImage render(Map&);
+
+    optional<TransformState> getTransformState() const;
+
+private:
+    Size size;
+    float pixelRatio;
+
+    HeadlessBackend backend;
+    util::AsyncTask asyncInvalidate;
+
+    std::unique_ptr<Renderer> renderer;
+    std::shared_ptr<UpdateParameters> updateParameters;
+};
+
+} // namespace mbgl