Rasterizer.h from guliverkli at Krugle

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/* 
 *	Copyright (C) 2003-2006 Gabest
 *	http://www.gabest.org
 *
 *  This Program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *   
 *  This Program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *  GNU General Public License for more details.
 *   
 *  You should have received a copy of the GNU General Public License
 *  along with GNU Make; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
 *  http://www.gnu.org/copyleft/gpl.html
 *
 */

#pragma once

#include <atlcoll.h>
#include "SubtitleFile.h"
#include "Array.h"
#include "GlyphPath.h"
#include "..\..\SubPic\ISubPic.h"

namespace ssf
{
	class Rasterizer
	{
		bool fFirstSet;
		CPoint firstp, lastp;

	private:
		int mWidth, mHeight;

		union Span
		{
			struct {int x1, y1, x2, y2;};
			struct {unsigned __int64 first, second;};
			union Span() {}
			union Span(int _x1, int _y1, int _x2, int _y2) {x1 = _x1; y1 = _y1; x2 = _x2; y2 = _y2;}
			union Span(unsigned __int64 _first, unsigned __int64 _second) {first = _first; second = _second;}
		};

		Array<Span> mOutline, mWideOutline, mWideOutlineTmp;
		int mWideBorder;

		struct Edge {int next, posandflag;}* mpEdgeBuffer;
		unsigned int mEdgeHeapSize;
		unsigned int mEdgeNext;
		unsigned int* mpScanBuffer;

	protected:
		BYTE* mpOverlayBuffer;
		int mOverlayWidth, mOverlayHeight;
		int mPathOffsetX, mPathOffsetY;
		int mOffsetX, mOffsetY;

	private:
		void _TrashOverlay();
		void _ReallocEdgeBuffer(int edges);
		void _EvaluateBezier(const CPoint& p0, const CPoint& p1, const CPoint& p2, const CPoint& p3);
		void _EvaluateLine(CPoint p0, CPoint p1);
		void _OverlapRegion(Array<Span>& dst, Array<Span>& src, int dx, int dy);

	public:
		Rasterizer();
		virtual ~Rasterizer();

		bool ScanConvert(GlyphPath& path, const CRect& bbox);
		bool CreateWidenedRegion(int r);
		bool Rasterize(int xsub, int ysub);
		void Reuse(Rasterizer& r);

		void Blur(float n, int plane);
		CRect Draw(const SubPicDesc& spd, const CRect& clip, int xsub, int ysub, const DWORD* switchpts, int plane);
	};
}
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