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580 lines
14 KiB
580 lines
14 KiB
/**************************************************************************\
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*
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* Copyright (c) 1998-1999 Microsoft Corporation
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*
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* Module Name:
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*
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* path.hpp
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*
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* Abstract:
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*
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* Path related declarations
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*
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* Revision History:
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*
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* 12/06/1998 davidx
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* Created it.
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*
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* 06/16/1999 t-wehunt
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* Added RemoveSelfIntersections().
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*
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\**************************************************************************/
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#ifndef _PATH_HPP
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#define _PATH_HPP
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// This is used by the widener as an internal flag and as a deletion mask for
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// the endcap placement code. These two usages do not overlap.
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const INT PathPointTypeInternalUse = 0x40;
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/*
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// PathPointType is defined in GdiplusEnums.h.
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// Internally, we can use 0x40 for the internal use.
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//--------------------------------------------------------------------------
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// Path point types (only the lowest 8 bits are used.)
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// The lowest 3 bits are interpreted as point type
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// The higher 5 bits are reserved for flags.
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//--------------------------------------------------------------------------
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enum PathPointType
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{
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PathPointTypeStart = 0, // move
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PathPointTypeLine = 1, // line
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PathPointTypeBezier = 3, // default Beizer (= cubic Bezier)
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PathPointTypePathTypeMask = 0x07, // type mask (lowest 3 bits).
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PathPointTypeDashMode = 0x10, // currently in dash mode.
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PathPointTypePathMarker = 0x20, // a marker for the path.
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PathPointTypeCloseSubpath = 0x80, // closed flag
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// Path types used for advanced path.
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PathPointTypeBezier2 = 2, // quadratic Beizer
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PathPointTypeBezier3 = 3, // cubic Bezier
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PathPointTypeBezier4 = 4, // quartic (4th order) Beizer
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PathPointTypeBezier5 = 5, // quintic (5th order) Bezier
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PathPointTypeBezier6 = 6 // hexaic (6th order) Bezier
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};
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*/
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class GpGlyphPath;
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inline BOOL IsStartType(BYTE type)
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{
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return ((type & PathPointTypePathTypeMask) ==
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PathPointTypeStart);
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}
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inline BOOL IsClosedType(BYTE type)
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{
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return ((type & PathPointTypeCloseSubpath) ==
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PathPointTypeCloseSubpath);
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}
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inline BOOL IsDashType(BYTE type)
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{
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return ((type & PathPointTypeDashMode) ==
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PathPointTypeDashMode);
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}
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class GpPath : public DpPath
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{
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friend class GpGraphics;
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friend class GpPathGradient;
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public:
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// Path constructors
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GpPath(GpFillMode fillMode = FillModeAlternate)
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{
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InitDefaultState(fillMode);
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SetValid(TRUE);
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}
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GpPath(const GpPointF* points,
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const BYTE* types,
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INT count,
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GpFillMode fillMode = FillModeAlternate);
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GpPath(
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const GpPointF *points,
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INT count,
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GpPointF *stackPoints,
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BYTE *stackTypes,
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INT stackCount,
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GpFillMode fillMode = FillModeAlternate,
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DpPathFlags flags = PossiblyNonConvex
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);
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GpPath(HRGN hRgn); // create a path from a GDI region handle
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GpPath(const DpRegion* region); // create a path from a GDI+ region
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// Get the lock object
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GpLockable *GetObjectLock()
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{
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return &Lockable;
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}
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GpPath* Clone() const
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{
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ASSERT(IsValid())
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GpPath* path = new GpPath(this);
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CheckValid(path);
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return path;
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}
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GpStatus Reset(GpFillMode fillMode = FillModeAlternate)
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{
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// !!! bhouse We should allow reseting invalid paths
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ASSERT(IsValid());
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InitDefaultState(fillMode);
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return Ok;
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}
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virtual GpStatus
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GetBounds(
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GpRect *bounds,
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const GpMatrix *matrix = NULL,
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const DpPen* pen = NULL,
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REAL dpiX = 0,
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REAL dpiY = 0
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) const;
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virtual GpStatus
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GetBounds(
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GpRectF *bounds,
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const GpMatrix *matrix = NULL,
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const DpPen* pen = NULL,
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REAL dpiX = 0,
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REAL dpiY = 0
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) const;
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REAL GetSharpestAngle() const
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{
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if(!(CacheFlags & kSharpestAngleValid))
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CalcSharpestAngle();
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return SharpestAngle;
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}
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// Set a marker at the current location.
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GpStatus SetMarker();
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// Clear all markers.
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GpStatus ClearMarkers();
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// Add lines to the path object
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GpStatus AddLine(const GpPointF& pt1, const GpPointF& pt2)
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{
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GpPointF points[2];
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points[0] = pt1;
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points[1] = pt2;
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return AddLines(points, 2);
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}
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GpStatus AddLine(REAL x1, REAL y1, REAL x2, REAL y2)
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{
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GpPointF points[2];
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points[0].X = x1;
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points[0].Y = y1;
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points[1].X = x2;
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points[1].Y = y2;
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return AddLines(points, 2);
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}
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GpStatus AddLines(const GpPointF* points, INT count);
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// Add an arc to the path object
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GpStatus AddArc(const GpRectF& rect, REAL startAngle, REAL sweepAngle);
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GpStatus AddArc(REAL x, REAL y, REAL width, REAL height,
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REAL startAngle, REAL sweepAngle)
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{
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GpRectF rect(x, y, width, height);
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return AddArc(rect, startAngle, sweepAngle);
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}
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// Add Bezier curves to the path object
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GpStatus AddBezier(const GpPointF& pt1, const GpPointF& pt2,
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const GpPointF& pt3, const GpPointF& pt4);
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GpStatus AddBezier(REAL x1, REAL y1, REAL x2, REAL y2,
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REAL x3, REAL y3, REAL x4, REAL y4);
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GpStatus AddBeziers(const GpPointF* points, INT count);
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// Add cardinal splines to the path object
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GpStatus AddCurve(const GpPointF* points, INT count);
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GpStatus AddCurve(const GpPointF* points, INT count, REAL tension,
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INT offset, INT numberOfSegments);
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GpStatus AddClosedCurve(const GpPointF* points, INT count);
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GpStatus AddClosedCurve(const GpPointF* points, INT count, REAL tension);
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// Add closed shapes to the path object
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GpStatus AddRects(const GpRectF* rects, INT count);
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GpStatus AddRects(const RECT* rects, INT count);
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GpStatus AddPolygon(const GpPointF* points, INT count);
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GpStatus AddEllipse(const GpRectF& rect);
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GpStatus AddPie(const GpRectF& rect, REAL startAngle, REAL sweepAngle);
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GpStatus AddRect(const GpRectF& rect)
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{
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return AddRects(&rect, 1);
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}
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GpStatus AddEllipse(REAL x, REAL y, REAL width, REAL height)
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{
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GpRectF rect(x, y, width, height);
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return AddEllipse(rect);
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}
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GpStatus AddPie(REAL x, REAL y, REAL width, REAL height,
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REAL startAngle, REAL sweepAngle)
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{
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GpRectF rect(x, y, width, height);
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return AddPie(rect, startAngle, sweepAngle);
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}
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// Add a path to the path object
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GpStatus AddPath(const GpPointF* points, const BYTE* types, INT count,
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BOOL connect);
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GpStatus AddPath(const GpPath* path, BOOL connect);
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// Reverse the direction of a path.
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GpStatus Reverse();
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GpStatus GetLastPoint(GpPointF* point);
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// used by font
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GpStatus MoveTo(const GpPointF point);
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GpStatus AddPoints(const GpPointF* points, ULONG count, PathPointType type);
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GpStatus AddGlyphPath(GpGlyphPath *glyphPath, REAL x, REAL y, const GpMatrix * matrix = 0);
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GpStatus AddString(
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const WCHAR *string,
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INT length,
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const GpFontFamily *family,
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INT style,
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REAL emSize,
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const RectF *layoutRect,
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const GpStringFormat *format
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);
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// Get the flatten data.
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virtual GpStatus Flatten(
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DynByteArray *flattenTypes,
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DynPointFArray *flattenPoints,
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const GpMatrix *matrix = NULL,
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const REAL flatness = FlatnessDefault
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) const;
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// Flatten this path.
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GpStatus Flatten(
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const GpMatrix *matrix = NULL,
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const REAL flatness = FlatnessDefault
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);
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// Get the morph and flatten data.
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GpStatus WarpAndFlatten(
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DynByteArray* flattenTypes,
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DynPointFArray* flattenPoints,
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const GpMatrix* matrix,
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const GpPointF* destPoint,
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INT count,
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const GpRectF& srcRect,
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WarpMode warpMode = WarpModePerspective
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);
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// Morph and flatten itself.
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GpStatus WarpAndFlattenSelf(
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GpMatrix* matrix,
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const GpPointF* destPoint,
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INT count,
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const GpRectF& srcRect,
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WarpMode warpMode = WarpModePerspective
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); // Morph to the flatten points.
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// Widen the path object
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GpPath*
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GetWidenedPath(
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const GpPen* pen,
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const GpMatrix* matrix = NULL,
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REAL flatness = FlatnessDefault
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) const;
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GpStatus
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Widen(
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GpPen* pen,
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GpMatrix* matrix = NULL,
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REAL flatness = FlatnessDefault
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);
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// Get the flattened path.
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virtual const DpPath *
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GetFlattenedPath(
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const GpMatrix* matrix,
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DpEnumerationType type,
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const DpPen* pen = NULL
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) const;
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// Dreate a dashed path. (override)
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GpPath*
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CreateDashedPath(
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const GpPen* pen,
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const GpMatrix* matrix,
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REAL dpiX,
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REAL dpiY,
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REAL dashScale = 1.0f,
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BOOL needDashCaps = TRUE
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) const;
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GpPath*
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CreateDashedPath(
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const DpPen* pen,
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const GpMatrix* matrix,
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REAL dpiX,
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REAL dpiY,
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REAL dashScale = 1.0f,
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BOOL needDashCaps = TRUE
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) const;
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// Get the open and closed portion of the current path.
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GpPath* GetOpenPath();
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GpPath* GetClosedPath();
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// Determine if the path is empty, i.e. with no points
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BOOL IsEmpty() const
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{
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return GetPointCount() == 0;
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}
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BOOL IsRectangle(
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const GpMatrix * matrix,
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GpRectF * transformedBounds = NULL
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) const;
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// Determine if path consists of a single polygon/polyline.
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BOOL IsPolygon() const
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{
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return (SubpathCount == 1) && !HasBezier;
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}
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// Return true if the two objects represent identical paths
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BOOL IsEqual(const GpPath* path) const;
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// Transform the path by the specified matrix
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VOID Transform(const GpMatrix * matrix);
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VOID SetHasBezier(BOOL _hasBezier) { HasBezier = _hasBezier; }
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// Hit testing
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GpStatus IsVisible(
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GpPointF* point,
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BOOL* isVisible,
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GpMatrix* matrix = NULL);
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GpStatus IsOutlineVisible(GpPointF* point, BOOL* isVisible, GpPen* pen,
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GpMatrix* matrix = NULL, REAL dpiX = 0, REAL dpiY = 0);
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// DDI entry point handlers for DpPath
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static GpPath* GetPath(const DpPath* path)
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{
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return (GpPath*)(path);
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}
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static DpPath* DriverCreateWidenedPath(
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const DpPath* path,
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const DpPen* pen,
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DpContext* context,
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BOOL outline
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);
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static VOID DriverDeletePath(DpPath* path);
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static DpPath* DriverClonePath(DpPath* path);
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static VOID DriverTransformPath(DpPath* path, GpMatrix* matrix);
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// Compute the winding mode outline.
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GpStatus ComputeWindingModeOutline(
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const GpMatrix *matrix,
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REAL flatness,
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BOOL *wereIntersectsRemoved = NULL
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);
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// Used for a mark-sweep point deletion algorithm in the path.
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VOID EraseMarkedSegments();
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virtual DynArray<SubpathInfo> *GetSubpathInformation() const;
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protected:
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VOID ComputeSubpathInformationCache() const;
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GpPath(const GpPath* path);
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GpPath *GetWidenedPathInternal(
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const DpPen *pen,
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const GpMatrix *matrix,
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REAL flatness = FlatnessDefault,
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BOOL insetPen = FALSE
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) const;
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protected:
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BYTE*
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AddPointHelper(
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const GpPointF* points,
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INT count,
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BOOL addClosedFigure
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);
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GpPath*
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GetOpenOrClosedPath(BOOL openPath);
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static GpPointF*
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ConvertSplineToBezierPoints(
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const GpPointF* points,
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INT count,
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INT offset,
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INT numberOfSegments,
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REAL tension,
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INT* bezierCount
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);
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static INT
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GetArcPoints(
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GpPointF* points,
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const GpRectF& rect,
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REAL startAngle,
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REAL sweepAngle
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);
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VOID InitDefaultState(GpFillMode fillMode);
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VOID ResetCacheBounds() const
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{
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CacheFlags = (kCacheBoundsValid | kSharpestAngleValid);
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SharpestAngle = 2;
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CacheBounds.X = 0;
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CacheBounds.Y = 0;
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CacheBounds.Width = 0;
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CacheBounds.Height = 0;
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}
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VOID InvalidateCache() const
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{
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CacheFlags = 0;
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}
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VOID UpdateCacheBounds() const
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{
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if(!(CacheFlags & kCacheBoundsValid))
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CalcCacheBounds();
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}
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VOID CalcCacheBounds() const;
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VOID CalcSharpestAngle() const;
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// Data Members:
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protected:
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GpLockable Lockable; // object lock
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enum {
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kCacheBoundsValid = 1,
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kSharpestAngleValid = 2,
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kSubpathInfoValid = 4
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};
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mutable ULONG CacheFlags;
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mutable GpRectF CacheBounds;
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mutable REAL SharpestAngle;
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// Some small number of subpaths for our initial allocation should suffice
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// for most usage scenarios.
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mutable DynArrayIA<SubpathInfo, 3> SubpathInfoCache;
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};
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class GpPathIterator : public DpPathIterator
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{
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public:
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GpPathIterator(GpPath* path) : DpPathIterator(path)
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{
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}
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virtual INT GetCount()
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{
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if(IsValid())
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return Count;
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else
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return 0;
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}
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virtual INT GetSubpathCount()
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{
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if(IsValid())
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return SubpathCount;
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else
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return 0;
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}
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// This iterator is not used for the extended path.
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virtual BOOL IsValid() {return (DpPathIterator::IsValid() && !ExtendedPath);}
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// Get the lock object
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GpLockable *GetObjectLock()
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{
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return &Lockable;
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}
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protected:
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GpLockable Lockable;
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};
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#endif // !_PATH_HPP
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