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1 files changed, 328 insertions, 0 deletions

diff --git a/src/ftgl/FTVectoriser.cpp b/src/ftgl/FTVectoriser.cpp
new file mode 100644
index 0000000..ea5c571
--- /dev/null
+++ b/src/ftgl/FTVectoriser.cpp
@@ -0,0 +1,328 @@
+/*
+ * FTGL - OpenGL font library
+ *
+ * Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz>
+ * Copyright (c) 2008 Éric Beets <ericbeets@free.fr>
+ * Copyright (c) 2008 Sam Hocevar <sam@zoy.org>
+ *
+ * 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.
+ */
+
+#include "config.h"
+
+#include "FTInternals.h"
+#include "FTVectoriser.h"
+
+#ifndef CALLBACK
+#define CALLBACK
+#endif
+
+#if defined __APPLE_CC__ && __APPLE_CC__ < 5465
+    typedef GLvoid (*GLUTesselatorFunction) (...);
+#elif defined WIN32 && !defined __CYGWIN__
+    typedef GLvoid (CALLBACK *GLUTesselatorFunction) ();
+#else
+    typedef GLvoid (*GLUTesselatorFunction) ();
+#endif
+
+
+void CALLBACK ftglError(GLenum errCode, FTMesh* mesh)
+{
+    mesh->Error(errCode);
+}
+
+
+void CALLBACK ftglVertex(void* data, FTMesh* mesh)
+{
+    FTGL_DOUBLE* vertex = static_cast<FTGL_DOUBLE*>(data);
+    mesh->AddPoint(vertex[0], vertex[1], vertex[2]);
+}
+
+
+void CALLBACK ftglCombine(FTGL_DOUBLE coords[3], void* vertex_data[4], GLfloat weight[4], void** outData, FTMesh* mesh)
+{
+    const FTGL_DOUBLE* vertex = static_cast<const FTGL_DOUBLE*>(coords);
+    *outData = const_cast<FTGL_DOUBLE*>(mesh->Combine(vertex[0], vertex[1], vertex[2]));
+}
+
+void CALLBACK ftglBegin(GLenum type, FTMesh* mesh)
+{
+    mesh->Begin(type);
+}
+
+
+void CALLBACK ftglEnd(FTMesh* mesh)
+{
+    mesh->End();
+}
+
+
+FTMesh::FTMesh()
+: currentTesselation(0),
+    err(0)
+{
+    tesselationList.reserve(16);
+}
+
+
+FTMesh::~FTMesh()
+{
+    for(size_t t = 0; t < tesselationList.size(); ++t)
+    {
+        delete tesselationList[t];
+    }
+
+    tesselationList.clear();
+}
+
+
+void FTMesh::AddPoint(const FTGL_DOUBLE x, const FTGL_DOUBLE y, const FTGL_DOUBLE z)
+{
+    currentTesselation->AddPoint(x, y, z);
+}
+
+
+const FTGL_DOUBLE* FTMesh::Combine(const FTGL_DOUBLE x, const FTGL_DOUBLE y, const FTGL_DOUBLE z)
+{
+    tempPointList.push_back(FTPoint(x, y,z));
+    return static_cast<const FTGL_DOUBLE*>(tempPointList.back());
+}
+
+
+void FTMesh::Begin(GLenum meshType)
+{
+    currentTesselation = new FTTesselation(meshType);
+}
+
+
+void FTMesh::End()
+{
+    tesselationList.push_back(currentTesselation);
+}
+
+
+const FTTesselation* const FTMesh::Tesselation(size_t index) const
+{
+    return (index < tesselationList.size()) ? tesselationList[index] : NULL;
+}
+
+
+FTVectoriser::FTVectoriser(const FT_GlyphSlot glyph)
+:   contourList(0),
+    mesh(0),
+    ftContourCount(0),
+    contourFlag(0)
+{
+    if(glyph)
+    {
+        outline = glyph->outline;
+
+        ftContourCount = outline.n_contours;
+        contourList = 0;
+        contourFlag = outline.flags;
+
+        ProcessContours();
+    }
+}
+
+
+FTVectoriser::~FTVectoriser()
+{
+    for(size_t c = 0; c < ContourCount(); ++c)
+    {
+        delete contourList[c];
+    }
+
+    delete [] contourList;
+    delete mesh;
+}
+
+
+void FTVectoriser::ProcessContours()
+{
+    short contourLength = 0;
+    short startIndex = 0;
+    short endIndex = 0;
+
+    contourList = new FTContour*[ftContourCount];
+
+    for(int i = 0; i < ftContourCount; ++i)
+    {
+        FT_Vector* pointList = &outline.points[startIndex];
+        char* tagList = &outline.tags[startIndex];
+
+        endIndex = outline.contours[i];
+        contourLength =  (endIndex - startIndex) + 1;
+
+        FTContour* contour = new FTContour(pointList, tagList, contourLength);
+
+        contourList[i] = contour;
+
+        startIndex = endIndex + 1;
+    }
+
+    // Compute each contour's parity. FIXME: see if FT_Outline_Get_Orientation
+    // can do it for us.
+    for(int i = 0; i < ftContourCount; i++)
+    {
+        FTContour *c1 = contourList[i];
+
+        // 1. Find the leftmost point.
+        FTPoint leftmost(65536.0, 0.0);
+
+        for(size_t n = 0; n < c1->PointCount(); n++)
+        {
+            FTPoint p = c1->Point(n);
+            if(p.X() < leftmost.X())
+            {
+                leftmost = p;
+            }
+        }
+
+        // 2. Count how many other contours we cross when going further to
+        // the left.
+        int parity = 0;
+
+        for(int j = 0; j < ftContourCount; j++)
+        {
+            if(j == i)
+            {
+                continue;
+            }
+
+            FTContour *c2 = contourList[j];
+
+            for(size_t n = 0; n < c2->PointCount(); n++)
+            {
+                FTPoint p1 = c2->Point(n);
+                FTPoint p2 = c2->Point((n + 1) % c2->PointCount());
+
+                /* FIXME: combinations of >= > <= and < do not seem stable */
+                if((p1.Y() < leftmost.Y() && p2.Y() < leftmost.Y())
+                    || (p1.Y() >= leftmost.Y() && p2.Y() >= leftmost.Y())
+                    || (p1.X() > leftmost.X() && p2.X() > leftmost.X()))
+                {
+                    continue;
+                }
+                else if(p1.X() < leftmost.X() && p2.X() < leftmost.X())
+                {
+                    parity++;
+                }
+                else
+                {
+                    FTPoint a = p1 - leftmost;
+                    FTPoint b = p2 - leftmost;
+                    if(b.X() * a.Y() > b.Y() * a.X())
+                    {
+                        parity++;
+                    }
+                }
+            }
+        }
+
+        // 3. Make sure the glyph has the proper parity.
+        c1->SetParity(parity);
+    }
+}
+
+
+size_t FTVectoriser::PointCount()
+{
+    size_t s = 0;
+    for(size_t c = 0; c < ContourCount(); ++c)
+    {
+        s += contourList[c]->PointCount();
+    }
+
+    return s;
+}
+
+
+const FTContour* const FTVectoriser::Contour(size_t index) const
+{
+    return (index < ContourCount()) ? contourList[index] : NULL;
+}
+
+
+void FTVectoriser::MakeMesh(FTGL_DOUBLE zNormal, int outsetType, float outsetSize)
+{
+    if(mesh)
+    {
+        delete mesh;
+    }
+
+    mesh = new FTMesh;
+
+    GLUtesselator* tobj = gluNewTess();
+
+    gluTessCallback(tobj, GLU_TESS_BEGIN_DATA,     (GLUTesselatorFunction)ftglBegin);
+    gluTessCallback(tobj, GLU_TESS_VERTEX_DATA,    (GLUTesselatorFunction)ftglVertex);
+    gluTessCallback(tobj, GLU_TESS_COMBINE_DATA,   (GLUTesselatorFunction)ftglCombine);
+    gluTessCallback(tobj, GLU_TESS_END_DATA,       (GLUTesselatorFunction)ftglEnd);
+    gluTessCallback(tobj, GLU_TESS_ERROR_DATA,     (GLUTesselatorFunction)ftglError);
+
+    if(contourFlag & ft_outline_even_odd_fill) // ft_outline_reverse_fill
+    {
+        gluTessProperty(tobj, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_ODD);
+    }
+    else
+    {
+        gluTessProperty(tobj, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_NONZERO);
+    }
+
+
+    gluTessProperty(tobj, GLU_TESS_TOLERANCE, 0);
+    gluTessNormal(tobj, 0.0f, 0.0f, zNormal);
+    gluTessBeginPolygon(tobj, mesh);
+
+        for(size_t c = 0; c < ContourCount(); ++c)
+        {
+            /* Build the */
+            switch(outsetType)
+            {
+                case 1 : contourList[c]->buildFrontOutset(outsetSize); break;
+                case 2 : contourList[c]->buildBackOutset(outsetSize); break;
+            }
+            const FTContour* contour = contourList[c];
+
+
+            gluTessBeginContour(tobj);
+                for(size_t p = 0; p < contour->PointCount(); ++p)
+                {
+                    const FTGL_DOUBLE* d;
+                    switch(outsetType)
+                    {
+                        case 1: d = contour->FrontPoint(p); break;
+                        case 2: d = contour->BackPoint(p); break;
+                        case 0: default: d = contour->Point(p); break;
+                    }
+                    // XXX: gluTessVertex doesn't modify the data but does not
+                    // specify "const" in its prototype, so we cannot cast to
+                    // a const type.
+                    gluTessVertex(tobj, (GLdouble *)d, (GLvoid *)d);
+                }
+
+            gluTessEndContour(tobj);
+        }
+    gluTessEndPolygon(tobj);
+
+    gluDeleteTess(tobj);
+}
+