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Diffstat (limited to 'src/vg/Path.h')
| -rw-r--r-- | src/vg/Path.h | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/src/vg/Path.h b/src/vg/Path.h new file mode 100644 index 0000000..d92cb17 --- /dev/null +++ b/src/vg/Path.h @@ -0,0 +1,177 @@ +#ifndef __PATH_H +#define __PATH_H + +/*------------------------------------------------------------------------ + * + * OpenVG 1.1 Reference Implementation + * ----------------------------------- + * + * Copyright (c) 2007 The Khronos Group Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and /or associated documentation files + * (the "Materials "), to deal in the Materials without restriction, + * including without limitation the rights to use, copy, modify, merge, + * publish, distribute, sublicense, and/or sell copies of the Materials, + * and to permit persons to whom the Materials are furnished to do so, + * subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Materials. + * + * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR + * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE MATERIALS OR + * THE USE OR OTHER DEALINGS IN THE MATERIALS. + * + *//** + * \file + * \brief Path class. + * \note + *//*-------------------------------------------------------------------*/ + +#include "VG/openvg.h" +#include "Math.h" +#include "Array.h" +#include "Rasterizer.h" + +//============================================================================================== + +namespace tgOpenVG +{ + +/*-------------------------------------------------------------------*//*! +* \brief Storage and operations for VGPath. +* \param +* \return +* \note +*//*-------------------------------------------------------------------*/ + +class Path +{ +public: + Path(VGint format, VGPathDatatype datatype, RIfloat scale, RIfloat bias, int segmentCapacityHint, int coordCapacityHint, VGbitfield caps); //throws bad_alloc + ~Path(); + + VGint getFormat() const { return m_format; } + VGPathDatatype getDatatype() const { return m_datatype; } + RIfloat getScale() const { return m_scale; } + RIfloat getBias() const { return m_bias; } + VGbitfield getCapabilities() const { return m_capabilities; } + void setCapabilities(VGbitfield caps) { m_capabilities = caps; } + int getNumSegments() const { return m_segments.size(); } + int getNumCoordinates() const { return m_data.size() / getBytesPerCoordinate(m_datatype); } + void addReference() { m_referenceCount++; } + int removeReference() { m_referenceCount--; RI_ASSERT(m_referenceCount >= 0); return m_referenceCount; } + + void clear(VGbitfield capabilities); + void appendData(const RIuint8* segments, int numSegments, const RIuint8* data); //throws bad_alloc + void append(const Path* srcPath); //throws bad_alloc + void modifyCoords(int startIndex, int numSegments, const RIuint8* data); + void transform(const Path* srcPath, const Matrix3x3& matrix); //throws bad_alloc + //returns true if interpolation succeeds, false if start and end paths are not compatible + bool interpolate(const Path* startPath, const Path* endPath, RIfloat amount); //throws bad_alloc + void fill(const Matrix3x3& pathToSurface, Rasterizer& rasterizer); //throws bad_alloc + void stroke(const Matrix3x3& pathToSurface, Rasterizer& rasterizer, const Array<RIfloat>& dashPattern, RIfloat dashPhase, bool dashPhaseReset, RIfloat strokeWidth, VGCapStyle capStyle, VGJoinStyle joinStyle, RIfloat miterLimit); //throws bad_alloc + + void getPointAlong(int startIndex, int numSegments, RIfloat distance, Vector2& p, Vector2& t); //throws bad_alloc + RIfloat getPathLength(int startIndex, int numSegments); //throws bad_alloc + void getPathBounds(RIfloat& minx, RIfloat& miny, RIfloat& maxx, RIfloat& maxy); //throws bad_alloc + void getPathTransformedBounds(const Matrix3x3& pathToSurface, RIfloat& minx, RIfloat& miny, RIfloat& maxx, RIfloat& maxy); //throws bad_alloc + +private: + enum VertexFlags + { + START_SUBPATH = (1<<0), + END_SUBPATH = (1<<1), + START_SEGMENT = (1<<2), + END_SEGMENT = (1<<3), + CLOSE_SUBPATH = (1<<4), + IMPLICIT_CLOSE_SUBPATH = (1<<5) + }; + struct Vertex + { + Vertex() : userPosition(), userTangent(), pathLength(0.0f), flags(0) {} + Vector2 userPosition; + Vector2 userTangent; + RIfloat pathLength; + unsigned int flags; + }; + struct StrokeVertex + { + StrokeVertex() : p(), t(), ccw(), cw(), pathLength(0.0f), flags(0), inDash(false) {} + Vector2 p; + Vector2 t; + Vector2 ccw; + Vector2 cw; + RIfloat pathLength; + unsigned int flags; + bool inDash; + }; + + Path(const Path&); //!< Not allowed. + const Path& operator=(const Path&); //!< Not allowed. + + static VGPathSegment getPathSegment(RIuint8 data) { return (VGPathSegment)(data & 0x1e); } + static VGPathAbsRel getPathAbsRel(RIuint8 data) { return (VGPathAbsRel)(data & 0x1); } + static int segmentToNumCoordinates(VGPathSegment segment); + static int countNumCoordinates(const RIuint8* segments, int numSegments); + static int getBytesPerCoordinate(VGPathDatatype datatype); + + static void setCoordinate(Array<RIuint8>& data, VGPathDatatype datatype, RIfloat scale, RIfloat bias, int i, RIfloat c); + + RIfloat getCoordinate(int i) const; + void setCoordinate(int i, RIfloat c) { setCoordinate(m_data, m_datatype, m_scale, m_bias, i, c); } + + void addVertex(const Vector2& p, const Vector2& t, RIfloat pathLength, unsigned int flags); //throws bad_alloc + void addEdge(const Vector2& p0, const Vector2& p1, const Vector2& t0, const Vector2& t1, unsigned int startFlags, unsigned int endFlags); //throws bad_alloc + + void addEndPath(const Matrix3x3& pathToSurface, const Vector2& p0, const Vector2& p1, bool subpathHasGeometry, unsigned int flags); //throws bad_alloc + bool addLineTo(const Matrix3x3& pathToSurface, const Vector2& p0, const Vector2& p1, bool subpathHasGeometry); //throws bad_alloc + bool addQuadTo(const Matrix3x3& pathToSurface, const Vector2& p0, const Vector2& p1, const Vector2& p2, bool subpathHasGeometry, float strokeWidth); //throws bad_alloc + bool addCubicTo(const Matrix3x3& pathToSurface, const Vector2& p0, const Vector2& p1, const Vector2& p2, const Vector2& p3, bool subpathHasGeometry, float strokeWidth); //throws bad_alloc + bool addArcTo(const Matrix3x3& pathToSurface, const Vector2& p0, RIfloat rh, RIfloat rv, RIfloat rot, const Vector2& p1, const Vector2& p1r, VGPathSegment segment, bool subpathHasGeometry, float strokeWidth); //throws bad_alloc + + void tessellate(const Matrix3x3& pathToSurface, float strokeWidth); //throws bad_alloc + + void normalizeForInterpolation(const Path* srcPath); //throws bad_alloc + + void interpolateStroke(const Matrix3x3& pathToSurface, Rasterizer& rasterizer, const StrokeVertex& v0, const StrokeVertex& v1, RIfloat strokeWidth) const; //throws bad_alloc + void doCap(const Matrix3x3& pathToSurface, Rasterizer& rasterizer, const StrokeVertex& v, RIfloat strokeWidth, VGCapStyle capStyle) const; //throws bad_alloc + void doJoin(const Matrix3x3& pathToSurface, Rasterizer& rasterizer, const StrokeVertex& v0, const StrokeVertex& v1, RIfloat strokeWidth, VGJoinStyle joinStyle, RIfloat miterLimit) const; //throws bad_alloc + + //input data + VGint m_format; + VGPathDatatype m_datatype; + RIfloat m_scale; + RIfloat m_bias; + VGbitfield m_capabilities; + int m_referenceCount; + Array<RIuint8> m_segments; + Array<RIuint8> m_data; + + //data produced by tessellation + struct VertexIndex + { + int start; + int end; + }; + Array<Vertex> m_vertices; + int m_numTessVertices; + Array<VertexIndex> m_segmentToVertex; + RIfloat m_userMinx; + RIfloat m_userMiny; + RIfloat m_userMaxx; + RIfloat m_userMaxy; +}; + +//============================================================================================== + +} //namespace tgOpenVG + +//============================================================================================== + +#endif /* __PATH_H */ |