VisualScriptEngine/Sources/WindowsAppSupport/WAS_GdiOffscreenContext.hpp at 7fb6958c7a7d48087919d86a4a7820c32173a9fe · kovacsv/VisualScriptEngine · GitHub

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#ifndef WAS_GDIOFFSCREENCONTEXT_HPP
#define WAS_GDIOFFSCREENCONTEXT_HPP

#include <unordered_map>

#include "NUIE_DrawingContext.hpp"
#include "NUIE_Drawing.hpp"
#include "NUIE_DrawingCacheKeys.hpp"
#include "WAS_IncludeWindowsHeaders.hpp"
#include "WAS_OffscreenBitmap.hpp"

namespace WAS
{

#ifdef _MSC_VER
template <typename KeyType>
HANDLE CreateHandle (const KeyType& key);
#else
HANDLE CreateHandle (const NUIE::PenCacheKey& key);
HANDLE CreateHandle (const NUIE::ColorCacheKey& key);
HANDLE CreateHandle (const NUIE::FontCacheKey& key);
#endif

template <typename KeyType>
class HandleCache
{
public:
	HandleCache ()
	{

	}

	~HandleCache ()
	{
		for (auto& it: cache) {
			DeleteObject (it.second);
		}
	}

	HANDLE Get (const KeyType& key)
	{
		KeyType cacheKey (key);
		auto found = cache.find (cacheKey);
		if (found != cache.end ()) {
			return found->second;
		}
		HANDLE keyHandle = CreateHandle (cacheKey);
		cache.insert ({ cacheKey, keyHandle });
		return keyHandle;
	}

private:
	std::unordered_map<KeyType, HANDLE> cache;
};

class GdiOffscreenContext : public NUIE::NativeDrawingContext
{
public:
	GdiOffscreenContext ();
	GdiOffscreenContext (const GdiOffscreenContext& rhs) = delete;
	virtual ~GdiOffscreenContext ();

	virtual void				Init (void* nativeHandle) override;
	virtual void				BlitToWindow (void* nativeHandle) override;
	virtual void				BlitToContext (void* nativeContext) override;

	virtual void				Resize (int newWidth, int newHeight) override;

	virtual int					GetWidth () const override;
	virtual int					GetHeight () const override;

	virtual void				BeginDraw () override;
	virtual void				EndDraw () override;

	virtual bool				NeedToDraw (ItemPreviewMode mode) override;

	virtual void				DrawLine (const NUIE::Point& beg, const NUIE::Point& end, const NUIE::Pen& pen) override;
	virtual void				DrawBezier (const NUIE::Point& p1, const NUIE::Point& p2, const NUIE::Point& p3, const NUIE::Point& p4, const NUIE::Pen& pen) override;

	virtual void				DrawRect (const NUIE::Rect& rect, const NUIE::Pen& pen) override;
	virtual void				FillRect (const NUIE::Rect& rect, const NUIE::Color& color) override;

	virtual void				DrawEllipse (const NUIE::Rect& rect, const NUIE::Pen& pen) override;
	virtual void				FillEllipse (const NUIE::Rect& rect, const NUIE::Color& color) override;

	virtual void				DrawFormattedText (const NUIE::Rect& rect, const NUIE::Font& font, const std::wstring& text, NUIE::HorizontalAnchor hAnchor, NUIE::VerticalAnchor vAnchor, const NUIE::Color& textColor) override;
	virtual NUIE::Size			MeasureText (const NUIE::Font& font, const std::wstring& text) override;

	virtual bool				CanDrawIcon () override;
	virtual void				DrawIcon (const NUIE::Rect& rect, const NUIE::IconId& iconId) override;

private:
	void						CreateOffscreenContext ();
	POINT						CreatePoint (const NUIE::Point& point) const;
	RECT						CreateRect (const NUIE::Rect& rect) const;
	RECT						CreateRect (const NUIE::Rect& rect, const NUIE::Pen& pen) const;

	int									width;
	int									height;
	OffscreenBitmap						bitmap;

	HandleCache<NUIE::PenCacheKey>		penCache;
	HandleCache<NUIE::ColorCacheKey>	brushCache;
	HandleCache<NUIE::FontCacheKey>		fontCache;
};

}

#endif