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kc3-lang/ftgl/src/FTVectoriser.h
sammy
- src/FTVectoriser.h
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/* * FTGL - OpenGL font library * * Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz> * Copyright (c) 2008 Sam Hocevar <sam@hocevar.net> * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is 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 Software. * * THE SOFTWARE IS 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 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #ifndef __FTVectoriser__ #define __FTVectoriser__ #include "FTGL/ftgl.h" #include "FTContour.h" #include "FTList.h" #include "FTVector.h" #ifndef CALLBACK #define CALLBACK #endif /** * FTTesselation captures points that are output by OpenGL's gluTesselator. */ class FTTesselation { public: /** * Default constructor */ FTTesselation(GLenum m) : meshType(m) { pointList.reserve(128); } /** * Destructor */ ~FTTesselation() { pointList.clear(); } /** * Add a point to the mesh. */ void AddPoint(const FTGL_DOUBLE x, const FTGL_DOUBLE y, const FTGL_DOUBLE z) { pointList.push_back(FTPoint(x, y, z)); } /** * The number of points in this mesh */ size_t PointCount() const { return pointList.size(); } /** * */ const FTPoint& Point(unsigned int index) const { return pointList[index]; } /** * Return the OpenGL polygon type. */ GLenum PolygonType() const { return meshType; } private: /** * Points generated by gluTesselator. */ typedef FTVector<FTPoint> PointVector; PointVector pointList; /** * OpenGL primitive type from gluTesselator. */ GLenum meshType; }; /** * FTMesh is a container of FTTesselation's that make up a polygon glyph */ class FTMesh { typedef FTVector<FTTesselation*> TesselationVector; typedef FTList<FTPoint> PointList; public: /** * Default constructor */ FTMesh(); /** * Destructor */ ~FTMesh(); /** * Add a point to the mesh */ void AddPoint(const FTGL_DOUBLE x, const FTGL_DOUBLE y, const FTGL_DOUBLE z); /** * Create a combine point for the gluTesselator */ const FTGL_DOUBLE* Combine(const FTGL_DOUBLE x, const FTGL_DOUBLE y, const FTGL_DOUBLE z); /** * Begin a new polygon */ void Begin(GLenum meshType); /** * End a polygon */ void End(); /** * Record a gluTesselation error */ void Error(GLenum e) { err = e; } /** * The number of tesselations in the mesh */ size_t TesselationCount() const { return tesselationList.size(); } /** * Get a tesselation by index */ FTTesselation const * Tesselation(size_t index) const; /** * Return the temporary point list. For testing only. */ const PointList& TempPointList() const { return tempPointList; } /** * Get the GL ERROR returned by the glu tesselator */ GLenum Error() const { return err; } private: /** * The current sub mesh that we are constructing. */ FTTesselation* currentTesselation; /** * Holds each sub mesh that comprises this glyph. */ TesselationVector tesselationList; /** * Holds extra points created by gluTesselator. See ftglCombine. */ PointList tempPointList; /** * GL ERROR returned by the glu tesselator */ GLenum err; }; const FTGL_DOUBLE FTGL_FRONT_FACING = 1.0; const FTGL_DOUBLE FTGL_BACK_FACING = -1.0; /** * FTVectoriser class is a helper class that converts font outlines into * point data. * * @see FTExtrudeGlyph * @see FTOutlineGlyph * @see FTPolygonGlyph * @see FTContour * @see FTPoint * */ class FTVectoriser { public: /** * Constructor * * @param glyph The freetype glyph to be processed */ FTVectoriser(const FT_GlyphSlot glyph); /** * Destructor */ virtual ~FTVectoriser(); /** * Build an FTMesh from the vector outline data. * * @param zNormal The direction of the z axis of the normal * for this mesh * FIXME: change the following for a constant * @param outsetType Specify the outset type contour * 0 : Original * 1 : Front * 2 : Back * @param outsetSize Specify the outset size contour */ void MakeMesh(FTGL_DOUBLE zNormal = FTGL_FRONT_FACING, int outsetType = 0, float outsetSize = 0.0f); /** * Get the current mesh. */ FTMesh const * GetMesh() const { return mesh; } /** * Get the total count of points in this outline * * @return the number of points */ size_t PointCount(); /** * Get the count of contours in this outline * * @return the number of contours */ size_t ContourCount() const { return ftContourCount; } /** * Return a contour at index * * @return the number of contours */ FTContour const * Contour(size_t index) const; /** * Get the number of points in a specific contour in this outline * * @param c The contour index * @return the number of points in contour[c] */ size_t ContourSize(int c) const { return contourList[c]->PointCount(); } /** * Get the flag for the tesselation rule for this outline * * @return The contour flag */ int ContourFlag() const { return contourFlag; } private: /** * Process the freetype outline data into contours of points * * @param front front outset distance * @param back back outset distance */ void ProcessContours(); /** * The list of contours in the glyph */ FTContour** contourList; /** * A Mesh for tesselations */ FTMesh* mesh; /** * The number of contours reported by Freetype */ short ftContourCount; /** * A flag indicating the tesselation rule for the glyph */ int contourFlag; /** * A Freetype outline */ FT_Outline outline; }; #endif // __FTVectoriser__