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#ifndef MBGL_MAP_VIEW
#define MBGL_MAP_VIEW
#include <mbgl/util/chrono.hpp>
#include <mbgl/util/image.hpp>
#include <functional>
#include <memory>
namespace mbgl {
class Map;
enum MapChange : uint8_t {
MapChangeRegionWillChange = 0,
MapChangeRegionWillChangeAnimated = 1,
MapChangeRegionIsChanging = 2,
MapChangeRegionDidChange = 3,
MapChangeRegionDidChangeAnimated = 4,
MapChangeWillStartLoadingMap = 5,
MapChangeDidFinishLoadingMap = 6,
MapChangeDidFailLoadingMap = 7,
MapChangeWillStartRenderingFrame = 8,
MapChangeDidFinishRenderingFrame = 9,
MapChangeDidFinishRenderingFrameFullyRendered = 10,
MapChangeWillStartRenderingMap = 11,
MapChangeDidFinishRenderingMap = 12,
MapChangeDidFinishRenderingMapFullyRendered = 13,
};
class View {
public:
// Called from the main thread directly after initialization. Must always return the same value,
// i.e. it may not change over time.
virtual float getPixelRatio() const = 0;
// Called from the main thread 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 from the main thread 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 from the main thread when this View is associated with a Map object.
virtual void initialize(Map *map_);
// Called from the render thread. Makes the GL context active in the current
// thread. This is typically just called once at the beginning of the
// renderer setup since the render thread doesn't switch the contexts.
virtual void activate() = 0;
// Called from the render thread. Makes the GL context inactive in the current
// thread. This is called once just before the rendering thread terminates.
virtual void deactivate() = 0;
virtual void notify() = 0;
// Called from the render thread. The implementation must trigger a rerender.
// (map->renderSync() from the main thread must be called as a result of this)
virtual void invalidate() = 0;
// Called from the render thread before the render begins.
virtual void beforeRender() = 0;
// Called from the render thread after the render is complete.
virtual void afterRender() = 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.
// Must only be called from the same thread that caused the change.
// Must not be called from the render thread.
virtual void notifyMapChange(MapChange change);
protected:
mbgl::Map *map = nullptr;
};
} // namespace mbgl
#endif
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