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#include "FTVectoriser.h"
#include "FTGL.h"
#ifndef CALLBACK
#define CALLBACK
#endif
#if defined(__APPLE_CC__)
#if __APPLE_CC__ >= 5465
typedef GLvoid (*GLUTesselatorFunction)();
#else
typedef GLvoid (*GLUTesselatorFunction)(...);
#endif
#elif defined( __mips ) || defined( __linux__ ) || defined( __FreeBSD__ ) || defined( __OpenBSD__ ) || defined( __sun ) || defined (__CYGWIN__)
typedef GLvoid (*GLUTesselatorFunction)();
#elif defined ( WIN32)
typedef GLvoid (CALLBACK *GLUTesselatorFunction)( );
#else
#error "Error - need to define type GLUTesselatorFunction for this platform/compiler"
#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)
{
FTGL_DOUBLE* vertex = static_cast<FTGL_DOUBLE*>(coords);
*outData = 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);
}
FTGL_DOUBLE* FTMesh::Combine( const FTGL_DOUBLE x, const FTGL_DOUBLE y, const FTGL_DOUBLE z)
{
tempPointList.push_back( FTPoint( x, y,z));
return &tempPointList.back().x;
}
void FTMesh::Begin( GLenum meshType)
{
currentTesselation = new FTTesselation( meshType);
}
void FTMesh::End()
{
tesselationList.push_back( currentTesselation);
}
const FTTesselation* const FTMesh::Tesselation( unsigned int 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( short contourIndex = 0; contourIndex < ftContourCount; ++contourIndex)
{
FT_Vector* pointList = &outline.points[startIndex];
char* tagList = &outline.tags[startIndex];
endIndex = outline.contours[contourIndex];
contourLength = ( endIndex - startIndex) + 1;
FTContour* contour = new FTContour( pointList, tagList, contourLength);
contourList[contourIndex] = contour;
startIndex = endIndex + 1;
}
}
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( unsigned int index) const
{
return ( index < ContourCount()) ? contourList[index] : NULL;
}
void FTVectoriser::MakeMesh( FTGL_DOUBLE zNormal)
{
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)
{
const FTContour* contour = contourList[c];
gluTessBeginContour( tobj);
for( size_t p = 0; p < contour->PointCount(); ++p)
{
FTGL_DOUBLE* d = const_cast<FTGL_DOUBLE*>(&contour->Point(p).x);
gluTessVertex( tobj, d, d);
}
gluTessEndContour( tobj);
}
gluTessEndPolygon( tobj);
gluDeleteTess( tobj);
}
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