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#pragma once
#include <mbgl/map/change.hpp>
#include <mbgl/util/chrono.hpp>
#include <mbgl/util/image.hpp>
#include <functional>
#include <memory>
namespace mbgl {
class Map;
class View {
public:
virtual ~View() = default;
// Called directly after initialization. Must always return the same value, i.e. it may
// not change over time.
virtual float getPixelRatio() const = 0;
// Called when the View signaled a dimension change. Must return the logical dimension
// of this map in pixels.
virtual std::array<uint16_t, 2> getSize() const = 0;
// Called for every frame that is being rendered. Must return the absolute dimensions of
// the current framebuffer. Typically, this is the logical width scaled by the pixel ratio,
// but in case the view was moved to display with a different pixel ratio, it can also be
// different from that rule.
virtual std::array<uint16_t, 2> getFramebufferSize() const = 0;
// Called when this View is associated with a Map object.
virtual void initialize(Map*);
// Called when the view's GL context needs to be made active or inactive. These are called,
// as a matched pair, in four situations:
//
// 1. When releasing GL resources during Map destruction
// 2. When calling a CustomLayerInitializeFunction, during Map::addCustomLayer
// 3. When calling a CustomLayerDeinitializeFunction, during Map::removeCustomLayer
// 4. When rendering for Map::renderStill
//
// They are *not* called for Map::render; it is assumed that the correct context is already
// activated prior to calling Map::render.
virtual void activate() = 0;
virtual void deactivate() = 0;
// Called when the map needs to be rendered; the view should call Map::render() at some point
// in the near future. (Not called for Map::renderStill() mode.)
virtual void invalidate() = 0;
// Reads the pixel data from the current framebuffer. If your View implementation
// doesn't support reading from the framebuffer, return a null pointer.
virtual PremultipliedImage readStillImage();
// Notifies a watcher of map x/y/scale/rotation changes.
virtual void notifyMapChange(MapChange change);
protected:
mbgl::Map *map = nullptr;
};
} // namespace mbgl
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