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1717 lines
51 KiB
1717 lines
51 KiB
#include "precomp.h"
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#pragma hdrstop
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#include <math.h>
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#include <GL\glu.h>
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#include "batchinf.h"
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#include "glteb.h"
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#include "glapi.h"
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#include "glsbcltu.h"
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#include "fontoutl.h"
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static OFContext* CreateOFContext( HDC hdc,
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FLOAT chordalDeviation,
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FLOAT extrusion,
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int type,
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BOOL bUnicode );
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static BOOL ScaleFont( HDC hdc,
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OFContext* ofc,
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BOOL bUnicode );
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static void DestroyOFContext( HDC hdc,
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OFContext* ofc );
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static BOOL DrawGlyph( OFContext* ofc );
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static BOOL MakeDisplayListFromGlyph( OFContext* ofc,
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DWORD listName,
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LPGLYPHMETRICS glyphMetrics );
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static BOOL MakeLinesFromArc( OFContext* ofc,
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LOOP* pLoop,
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PRIM* pPrim,
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POINT2D p0,
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POINT2D p1,
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POINT2D p2,
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FLOAT chordalDeviationSquared);
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static LOOP_LIST* MakeLinesFromGlyph( OFContext* ofc );
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static BOOL MakeLinesFromTTLine( OFContext* ofc,
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LOOP* pLoop,
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PRIM* pPrim,
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UCHAR** pp,
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WORD pointCount );
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static BOOL MakeLinesFromTTPolycurve( OFContext* ofc,
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LOOP* pLoop,
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UCHAR** pp );
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static BOOL MakeLinesFromTTPolygon( OFContext* ofc,
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LOOP_LIST* pLoopList,
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UCHAR** pp );
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static BOOL MakeLinesFromTTQSpline( OFContext* ofc,
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LOOP* pLoop,
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PRIM* pPrim,
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UCHAR** pp,
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WORD pointCount );
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static void CALLBACK TessError( GLenum error,
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void *data);
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static void CALLBACK TessCombine( GLdouble coord[3],
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POINT2D* data[4],
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GLfloat w[4],
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POINT2D** dataOut,
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void *userData);
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static void FreeCombinePool( MEM_POOL *combinePool );
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static void ApplyVertexFilter( LOOP_LIST *pLoopList );
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static void CheckRedundantVertices( LOOP* pLoop );
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static BOOL PointsColinear( POINT2D *p1,
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POINT2D *p2,
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POINT2D *p3 );
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static FLOAT GetFixed( UCHAR** p );
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static LOOP_LIST* InitLoopBuf( void );
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static LOOP* NewLoop( LOOP_LIST *Loops,
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POINT2D *pFirstPoint );
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static void FreeLoopList( LOOP_LIST *pLoopList );
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static PRIM* NewPrim( LOOP *pLoop,
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DWORD primType );
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static void CalcVertPtrs( LOOP *pLoop );
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static BOOL AppendToVertBuf( LOOP* pLoop,
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PRIM* pPrim,
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POINT2D *p );
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// macros to access data from byte streams:
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// get WORD from byte stream, increment stream ptr by WORD
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#define GetWord( p ) \
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( *( ((UNALIGNED WORD *) *p)++ ) )
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// get DWORD from byte stream, increment stream ptr by DWORD
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#define GetDWord( p ) \
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( *( ((UNALIGNED DWORD *) *p)++ ) )
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// get signed word (SHORT) from byte stream, increment stream ptr by SHORT
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#define GetSignedWord( p ) \
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( *( ((UNALIGNED SHORT *) *p)++ ) )
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#define POINT2DEQUAL( p1, p2 ) \
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( (p1->x == p2->x) && (p1->y == p2->y) )
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/******************************Public*Routine******************************\
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* wglUseFontOutlinesA
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* wglUseFontOutlinesW
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*
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* Stubs that call wglUseFontOutlinesAW with the bUnicode flag set
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* appropriately.
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*
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\**************************************************************************/
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BOOL WINAPI
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wglUseFontOutlinesAW( HDC hDC,
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DWORD first,
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DWORD count,
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DWORD listBase,
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FLOAT chordalDeviation,
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FLOAT extrusion,
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int format,
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LPGLYPHMETRICSFLOAT lpgmf,
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BOOL bUnicode );
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BOOL WINAPI
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wglUseFontOutlinesA( HDC hDC,
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DWORD first,
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DWORD count,
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DWORD listBase,
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FLOAT chordalDeviation,
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FLOAT extrusion,
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int format,
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LPGLYPHMETRICSFLOAT lpgmf )
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{
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return wglUseFontOutlinesAW( hDC, first, count, listBase, chordalDeviation,
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extrusion, format, lpgmf, FALSE );
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}
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BOOL WINAPI
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wglUseFontOutlinesW( HDC hDC,
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DWORD first,
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DWORD count,
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DWORD listBase,
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FLOAT chordalDeviation,
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FLOAT extrusion,
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int format,
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LPGLYPHMETRICSFLOAT lpgmf )
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{
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return wglUseFontOutlinesAW( hDC, first, count, listBase, chordalDeviation,
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extrusion, format, lpgmf, TRUE );
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}
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/*****************************************************************************
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* wglUseFontOutlinesAW
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*
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* Converts a subrange of the glyphs in a TrueType font to OpenGL display
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* lists.
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*
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* History:
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* 15-Dec-1994 -by- Marc Fortier [marcfo]
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* Wrote it.
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*****************************************************************************/
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BOOL WINAPI
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wglUseFontOutlinesAW( HDC hDC,
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DWORD first,
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DWORD count,
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DWORD listBase,
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FLOAT chordalDeviation,
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FLOAT extrusion,
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int format,
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LPGLYPHMETRICSFLOAT lpgmf,
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BOOL bUnicode
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)
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{
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DWORD glyphIndex;
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DWORD listIndex = listBase;
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UCHAR* glyphBuf;
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DWORD glyphBufSize, error;
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OFContext* ofc;
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BOOL status=WFO_FAILURE;
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// Return error if there is no current RC.
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if (!GLTEB_CLTCURRENTRC())
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{
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WARNING("wglUseFontOutlines: no current RC\n");
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SetLastError(ERROR_INVALID_HANDLE);
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return status;
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}
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/*
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* Flush any previous OpenGL errors. This allows us to check for
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* new errors so they can be reported.
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*/
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while (glGetError() != GL_NO_ERROR)
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;
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/*
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* Preallocate a buffer for the outline data, and track its size:
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*/
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// XXX: do we need to start with such a big size for this buffer ?
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glyphBuf = (UCHAR*) ALLOC(glyphBufSize = 10240);
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if (!glyphBuf) {
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WARNING("Alloc of glyphBuf failed\n");
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return status;
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}
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/*
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* Create font outline context
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*/
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ofc = CreateOFContext( hDC, chordalDeviation, extrusion, format,
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bUnicode );
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if( !ofc ) {
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WARNING("CreateOFContext failed\n");
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goto exit;
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}
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/*
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* Process each glyph in the given range:
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*/
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for (glyphIndex = first; glyphIndex - first < count; ++glyphIndex)
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{
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GLYPHMETRICS glyphMetrics;
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DWORD glyphSize;
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static MAT2 matrix =
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{
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{0, 1}, {0, 0},
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{0, 0}, {0, 1}
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};
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/*
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* Determine how much space is needed to store the glyph's
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* outlines. If our glyph buffer isn't large enough,
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* resize it.
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*/
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if( bUnicode )
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glyphSize = GetGlyphOutlineW( hDC, glyphIndex, GGO_NATIVE,
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&glyphMetrics, 0, NULL, &matrix );
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else
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glyphSize = GetGlyphOutlineA( hDC, glyphIndex, GGO_NATIVE,
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&glyphMetrics, 0, NULL, &matrix );
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if( glyphSize == GDI_ERROR ) {
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WARNING("GetGlyphOutline() failed\n");
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goto exit;
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}
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if (glyphSize > glyphBufSize)
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{
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FREE(glyphBuf);
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glyphBuf = (UCHAR*) ALLOC(glyphBufSize = glyphSize);
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if (!glyphBuf) {
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WARNING("Alloc of glyphBuf failed\n");
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goto exit;
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}
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}
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/*
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* Get the glyph's outlines.
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*/
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if( bUnicode )
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error = GetGlyphOutlineW( hDC, glyphIndex, GGO_NATIVE,
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&glyphMetrics, glyphBufSize, glyphBuf, &matrix );
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else
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error = GetGlyphOutlineA( hDC, glyphIndex, GGO_NATIVE,
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&glyphMetrics, glyphBufSize, glyphBuf, &matrix );
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if( error == GDI_ERROR ) {
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WARNING("GetGlyphOutline() failed\n");
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goto exit;
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}
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/*
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* Turn the glyph into a display list:
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*/
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ofc->glyphBuf = glyphBuf;
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ofc->glyphSize = glyphSize;
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if (!MakeDisplayListFromGlyph( ofc,
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listIndex,
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&glyphMetrics)) {
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WARNING("MakeDisplayListFromGlyph() failed\n");
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listIndex++; // so it will be deleted
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goto exit;
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}
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/*
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* Supply scaled glyphMetrics if requested
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*/
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if( lpgmf ) {
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lpgmf->gmfBlackBoxX =
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ofc->scale * (FLOAT) glyphMetrics.gmBlackBoxX;
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lpgmf->gmfBlackBoxY =
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ofc->scale * (FLOAT) glyphMetrics.gmBlackBoxY;
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lpgmf->gmfptGlyphOrigin.x =
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ofc->scale * (FLOAT) glyphMetrics.gmptGlyphOrigin.x;
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lpgmf->gmfptGlyphOrigin.y =
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ofc->scale * (FLOAT) glyphMetrics.gmptGlyphOrigin.y;
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lpgmf->gmfCellIncX =
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ofc->scale * (FLOAT) glyphMetrics.gmCellIncX;
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lpgmf->gmfCellIncY =
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ofc->scale * (FLOAT) glyphMetrics.gmCellIncY;
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lpgmf++;
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}
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listIndex++;
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}
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// Set status to SUCCESS if we get this far
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status = WFO_SUCCESS;
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/*
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* Clean up temporary storage and return. If an error occurred,
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* set error flags and return FAILURE status;
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* otherwise just return SUCCESS.
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*/
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exit:
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if( glyphBuf )
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FREE(glyphBuf);
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if( ofc )
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DestroyOFContext( hDC, ofc);
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if( !status )
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{
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// assume memory error
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WARNING("wglUseFontOutlines: not enough memory\n");
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SetLastError(ERROR_NOT_ENOUGH_MEMORY);
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// free up display lists
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glDeleteLists( listBase, listIndex-listBase );
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}
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return status;
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}
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/*****************************************************************************
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* MakeDisplayListFromGlyph
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*
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* Converts the outline of a glyph to an OpenGL display list.
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*
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* Return value is nonzero for success, zero for failure.
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*
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* Does not check for OpenGL errors, so if the caller needs to know about them,
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* it should call glGetError().
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*****************************************************************************/
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static BOOL
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MakeDisplayListFromGlyph( IN OFContext* ofc,
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IN DWORD listName,
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IN LPGLYPHMETRICS glyphMetrics )
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{
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BOOL status;
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glNewList(listName, GL_COMPILE);
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/*
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* Set normal and orientation for front face of glyph
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*/
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glNormal3f( 0.0f, 0.0f, 1.0f );
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glFrontFace( GL_CCW );
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status = DrawGlyph( ofc );
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/*
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* Translate by gmCellIncX, gmCellIncY
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*/
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glTranslatef( ofc->scale * (FLOAT) glyphMetrics->gmCellIncX,
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ofc->scale * (FLOAT) glyphMetrics->gmCellIncY,
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0.0f );
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glEndList();
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// Check for GL errors occuring during processing of the glyph
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while( glGetError() != GL_NO_ERROR )
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status = WFO_FAILURE;
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return status;
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}
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/*****************************************************************************
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* DrawGlyph
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*
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* Converts the outline of a glyph to OpenGL drawing primitives, tessellating
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* as needed, and then draws the glyph. Tessellation of the quadratic splines
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* in the outline is controlled by "chordalDeviation", and the drawing
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* primitives (lines or polygons) are selected by "format".
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*
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* Return value is nonzero for success, zero for failure.
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*
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* Does not check for OpenGL errors, so if the caller needs to know about them,
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* it should call glGetError().
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* History:
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* 26-Sep-1995 -by- Marc Fortier [marcfo]
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* Use extrusioniser to draw polygonal faces with extrusion=0
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*****************************************************************************/
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static BOOL
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DrawGlyph( IN OFContext *ofc )
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{
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BOOL status = WFO_FAILURE;
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DWORD nLoops;
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DWORD point;
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DWORD nVerts;
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LOOP_LIST *pLoopList;
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LOOP *pLoop;
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POINT2D *p;
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MEM_POOL *mp = NULL;
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/*
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* Convert the glyph outlines to a set of polyline loops.
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* (See MakeLinesFromGlyph() for the format of the loop data
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* structure.)
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*/
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if( !(pLoopList = MakeLinesFromGlyph(ofc)) )
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goto exit;
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/*
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* Filter out unnecessary vertices
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*/
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ApplyVertexFilter( pLoopList );
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|
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/*
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* Now draw the loops in the appropriate format:
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*/
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if( ofc->format == WGL_FONT_LINES )
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{
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/*
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* This is the easy case. Just draw the outlines.
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*/
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nLoops = pLoopList->nLoops;
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pLoop = pLoopList->LoopBuf;
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#ifndef FONT_DEBUG
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for( ; nLoops; nLoops--, pLoop++ )
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{
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glBegin(GL_LINE_LOOP);
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nVerts = pLoop->nVerts;
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p = pLoop->VertBuf;
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for( ; nVerts; nVerts--, p++ ) {
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glVertex2fv( (FLOAT*) p );
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}
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glEnd();
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}
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#else
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// color code the primitives
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for( ; nLoops; nLoops--, pLoop++ )
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{
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DrawColorCodedLineLoop( pLoop, 0.0f );
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}
|
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#endif
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if( ofc->ec )
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extr_DrawLines( ofc->ec, pLoopList );
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status = WFO_SUCCESS;
|
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}
|
|
|
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else if (ofc->format == WGL_FONT_POLYGONS)
|
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{
|
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GLdouble v[3];
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|
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/*
|
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* This is the hard case. We have to set up a tessellator
|
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* to convert the outlines into a set of polygonal
|
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* primitives, which the tessellator passes to some
|
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* auxiliary routines for drawing.
|
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*/
|
|
|
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/* Initialize polygon extrusion for the glyph.
|
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* This prepares for tracking of the tesselation in order to
|
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* build the Back-facing polygons.
|
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*/
|
|
|
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mp = &ofc->combinePool;
|
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ofc->curCombinePool = mp;
|
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mp->index = 0;
|
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mp->next = NULL;
|
|
|
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if( ofc->ec ) {
|
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if( !extr_PolyInit( ofc->ec ) )
|
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goto exit;
|
|
|
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}
|
|
|
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ofc->TessErrorOccurred = 0;
|
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v[2] = 0.0;
|
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gluTessBeginPolygon( ofc->tess, ofc );
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|
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/*
|
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* Each loop returned from MakeLinesFromGlyph is closed (first and
|
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* last points are the same). The old tesselator had trouble with
|
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* this. Since the tesselator automatically closes all loops,
|
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* we skip the last point to be on the safe side.
|
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*/
|
|
|
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nLoops = pLoopList->nLoops;
|
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pLoop = pLoopList->LoopBuf;
|
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for( ; nLoops; nLoops--, pLoop++ )
|
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{
|
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gluTessBeginContour( ofc->tess );
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|
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nVerts = pLoop->nVerts - 1; // skip last point
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|
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p = pLoop->VertBuf;
|
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for( ; nVerts; nVerts--, p++ )
|
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{
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v[0] = p->x;
|
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v[1] = p->y;
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gluTessVertex(ofc->tess, v, p);
|
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}
|
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gluTessEndContour( ofc->tess );
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}
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|
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gluTessEndPolygon( ofc->tess );
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|
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if (ofc->TessErrorOccurred)
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goto exit;
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|
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if( ofc->ec ) {
|
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/* check for OUT_OF_MEMORY_ERROR in extrusion lib, that might
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* have occured during tesselation tracking.
|
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*/
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if( ofc->ec->TessErrorOccurred )
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goto exit;
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#ifdef VARRAY
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if( ofc->ec->zExtrusion == 0.0f )
|
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DrawFacePolygons( ofc->ec, 0.0f );
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else if( !extr_DrawPolygons( ofc->ec, pLoopList ) )
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goto exit;
|
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#else
|
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if( !extr_DrawPolygons( ofc->ec, pLoopList ) )
|
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goto exit;
|
|
#endif
|
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}
|
|
status = WFO_SUCCESS;
|
|
}
|
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|
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exit:
|
|
/*
|
|
* Putting PolyFinish here means PolyInit may not have been called.
|
|
* This is ok.
|
|
*/
|
|
if( mp )
|
|
FreeCombinePool( mp );
|
|
if( pLoopList )
|
|
FreeLoopList( pLoopList );
|
|
if( ofc->ec )
|
|
extr_PolyFinish( ofc->ec );
|
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|
|
return status;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* TessCombine
|
|
*
|
|
* Tesselation callback for loop intersection. We have to allocate a vertex
|
|
* and return it to tesselator. Allocation is from the context's static pool.
|
|
* If this runs dry, then a linked list of MEM_POOL blocks is used.
|
|
|
|
*****************************************************************************/
|
|
|
|
static void CALLBACK
|
|
TessCombine( GLdouble coord[3], POINT2D *data[4], GLfloat w[4],
|
|
POINT2D **dataOut, void *userData )
|
|
{
|
|
OFContext *ofc = (OFContext *) userData;
|
|
MEM_POOL *mp = ofc->curCombinePool;
|
|
POINT2D *p;
|
|
|
|
// make sure there's room available in the current pool block
|
|
if( mp->index >= POOL_SIZE )
|
|
{
|
|
// we need to allocate another MEM_POOL block
|
|
MEM_POOL *newPool;
|
|
|
|
newPool = (MEM_POOL *) ALLOC( sizeof(MEM_POOL) );
|
|
if( !newPool )
|
|
// tesselator will handle any problem with this
|
|
return;
|
|
|
|
newPool->index = 0;
|
|
newPool->next = NULL;
|
|
mp->next = newPool;
|
|
mp = newPool;
|
|
ofc->curCombinePool = mp; // new pool becomes the current pool
|
|
}
|
|
|
|
p = mp->pool + mp->index;
|
|
p->x = (GLfloat) coord[0];
|
|
p->y = (GLfloat) coord[1];
|
|
mp->index ++;
|
|
|
|
*dataOut = p;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* FreeCombinePool
|
|
*
|
|
* Frees any pools of memory allocated by TessCombine callback
|
|
|
|
*****************************************************************************/
|
|
static void
|
|
FreeCombinePool( MEM_POOL *memPool )
|
|
{
|
|
MEM_POOL *nextPool;
|
|
|
|
memPool = memPool->next; // first pool in list is static part of context
|
|
while( memPool ) {
|
|
nextPool = memPool->next;
|
|
FREE( memPool );
|
|
memPool = nextPool;
|
|
}
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* TessError
|
|
*
|
|
* Saves the last tessellator error code in ofc->TessErrorOccurred.
|
|
|
|
*****************************************************************************/
|
|
|
|
static void CALLBACK
|
|
TessError(GLenum error, void *data)
|
|
{
|
|
OFContext *ofc = (OFContext *) data;
|
|
|
|
// Only some of these errors are fatal:
|
|
switch( error ) {
|
|
case GLU_TESS_COORD_TOO_LARGE:
|
|
case GLU_TESS_NEED_COMBINE_CALLBACK:
|
|
ofc->TessErrorOccurred = error;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*****************************************************************************
|
|
* MakeLinesFromGlyph
|
|
*
|
|
* Converts the outline of a glyph from the TTPOLYGON format into
|
|
* structures of Loops, Primitives and Vertices.
|
|
*
|
|
* Line segments from the TTPOLYGON are transferred to the output array in
|
|
* the obvious way. Quadratic splines in the TTPOLYGON are converted to
|
|
* collections of line segments
|
|
|
|
*****************************************************************************/
|
|
|
|
|
|
static LOOP_LIST*
|
|
MakeLinesFromGlyph( IN OFContext* ofc )
|
|
{
|
|
UCHAR* p;
|
|
BOOL status = WFO_FAILURE;
|
|
LOOP_LIST *pLoopList;
|
|
|
|
/*
|
|
* Initialize the buffer into which we place the loop data:
|
|
*/
|
|
if( !(pLoopList = InitLoopBuf()) )
|
|
return NULL;
|
|
|
|
p = ofc->glyphBuf;
|
|
while (p < ofc->glyphBuf + ofc->glyphSize)
|
|
{
|
|
if( !MakeLinesFromTTPolygon( ofc, pLoopList, &p) )
|
|
goto exit;
|
|
}
|
|
|
|
status = WFO_SUCCESS;
|
|
|
|
exit:
|
|
if (!status) {
|
|
FreeLoopList( pLoopList );
|
|
pLoopList = (LOOP_LIST *) NULL;
|
|
}
|
|
|
|
return pLoopList;
|
|
}
|
|
|
|
|
|
|
|
/*****************************************************************************
|
|
* MakeLinesFromTTPolygon
|
|
*
|
|
* Converts a TTPOLYGONHEADER and its associated curve structures into a
|
|
* LOOP structure.
|
|
|
|
*****************************************************************************/
|
|
|
|
static BOOL
|
|
MakeLinesFromTTPolygon( IN OFContext* ofc,
|
|
IN LOOP_LIST* pLoopList,
|
|
IN OUT UCHAR** pp)
|
|
{
|
|
DWORD polySize;
|
|
UCHAR* polyStart;
|
|
POINT2D *pFirstP, *pLastP, firstPoint;
|
|
LOOP *pLoop;
|
|
PRIM *pPrim;
|
|
|
|
/*
|
|
* Record where the polygon data begins.
|
|
*/
|
|
polyStart = *pp;
|
|
|
|
/*
|
|
* Extract relevant data from the TTPOLYGONHEADER:
|
|
*/
|
|
polySize = GetDWord(pp);
|
|
if( GetDWord(pp) != TT_POLYGON_TYPE ) /* polygon type */
|
|
return WFO_FAILURE;
|
|
firstPoint.x = ofc->scale * GetFixed(pp); // 1st X coord
|
|
firstPoint.y = ofc->scale * GetFixed(pp); // 1st Y coord
|
|
|
|
/*
|
|
* Initialize a new LOOP struct in the LoopBuf, with the first point
|
|
*/
|
|
if( !(pLoop = NewLoop( pLoopList, &firstPoint )) )
|
|
return WFO_FAILURE;
|
|
|
|
/*
|
|
* Process each of the TTPOLYCURVE structures in the polygon:
|
|
*/
|
|
|
|
while (*pp < polyStart + polySize) {
|
|
if( !MakeLinesFromTTPolycurve( ofc, pLoop, pp ) )
|
|
return WFO_FAILURE;
|
|
}
|
|
|
|
/* Now have to fix up end of loop : after studying the chars, it
|
|
* was determined that if a curve started with a line, and ended with
|
|
* a qspline, AND the first and last point were not the same, then there
|
|
* is an implied line joining the two.
|
|
* In any case, we also make sure here that first and last points are
|
|
* coincident.
|
|
*/
|
|
|
|
pLastP = (POINT2D *) (pLoop->VertBuf+pLoop->nVerts-1);
|
|
pFirstP = &firstPoint;
|
|
|
|
if( !POINT2DEQUAL( pLastP, pFirstP ) ) {
|
|
// add 1-vertex line prim at the end
|
|
|
|
if( !(pPrim = NewPrim( pLoop, TT_PRIM_LINE)) )
|
|
return WFO_FAILURE;
|
|
|
|
if ( !AppendToVertBuf( pLoop, pPrim, pFirstP) )
|
|
return WFO_FAILURE;
|
|
}
|
|
|
|
/* At end of each loop, calculate pVert for each PRIM from its
|
|
* VertIndex value (for convenience later).
|
|
*/
|
|
CalcVertPtrs( pLoop );
|
|
|
|
return WFO_SUCCESS;
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
* MakeLinesFromTTPolyCurve
|
|
*
|
|
* Converts the lines and splines in a single TTPOLYCURVE structure to points
|
|
* in the Loop.
|
|
|
|
*****************************************************************************/
|
|
|
|
static BOOL
|
|
MakeLinesFromTTPolycurve( IN OFContext* ofc,
|
|
IN LOOP* pLoop,
|
|
IN OUT UCHAR** pp )
|
|
{
|
|
WORD type;
|
|
WORD pointCount;
|
|
PRIM *pPrim;
|
|
|
|
/*
|
|
* Pick up the relevant fields of the TTPOLYCURVE structure:
|
|
*/
|
|
type = GetWord(pp);
|
|
pointCount = GetWord(pp);
|
|
|
|
if( !(pPrim = NewPrim( pLoop, type )) )
|
|
return WFO_FAILURE;
|
|
|
|
/*
|
|
* Convert the "curve" to line segments:
|
|
*/
|
|
if (type == TT_PRIM_LINE) {
|
|
return MakeLinesFromTTLine( ofc, pLoop, pPrim, pp, pointCount);
|
|
|
|
} else if (type == TT_PRIM_QSPLINE) {
|
|
return MakeLinesFromTTQSpline( ofc, pLoop, pPrim, pp, pointCount );
|
|
|
|
} else
|
|
return WFO_FAILURE;
|
|
}
|
|
|
|
|
|
|
|
/*****************************************************************************
|
|
* MakeLinesFromTTLine
|
|
*
|
|
* Converts points from the polyline in a TT_PRIM_LINE structure to
|
|
* equivalent points in the Loop.
|
|
|
|
*****************************************************************************/
|
|
static BOOL
|
|
MakeLinesFromTTLine( IN OFContext* ofc,
|
|
IN LOOP* pLoop,
|
|
IN PRIM* pPrim,
|
|
IN OUT UCHAR** pp,
|
|
IN WORD pointCount)
|
|
{
|
|
POINT2D p;
|
|
|
|
/*
|
|
* Just copy the line segments into the vertex buffer (converting
|
|
* type as we go):
|
|
*/
|
|
|
|
while (pointCount--)
|
|
{
|
|
p.x = ofc->scale * GetFixed(pp); // X coord
|
|
p.y = ofc->scale * GetFixed(pp); // Y coord
|
|
if( !AppendToVertBuf( pLoop, pPrim, &p ) )
|
|
return WFO_FAILURE;
|
|
}
|
|
|
|
return WFO_SUCCESS;
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
* MakeLinesFromTTQSpline
|
|
*
|
|
* Converts points from the poly quadratic spline in a TT_PRIM_QSPLINE
|
|
* structure to polyline points in the Loop.
|
|
|
|
*****************************************************************************/
|
|
|
|
static BOOL
|
|
MakeLinesFromTTQSpline( IN OFContext* ofc,
|
|
IN LOOP* pLoop,
|
|
IN PRIM* pPrim,
|
|
IN OUT UCHAR** pp,
|
|
IN WORD pointCount )
|
|
{
|
|
POINT2D p0, p1, p2;
|
|
WORD point;
|
|
POINT2D p, *pLastP;
|
|
|
|
/*
|
|
* Process each of the non-interpolated points in the outline.
|
|
* To do this, we need to generate two interpolated points (the
|
|
* start and end of the arc) for each non-interpolated point.
|
|
* The first interpolated point is always the one most recently
|
|
* stored in VertBuf, so we just extract it from there. The
|
|
* second interpolated point is either the average of the next
|
|
* two points in the QSpline, or the last point in the QSpline
|
|
* if only one remains.
|
|
*/
|
|
|
|
// Start with last generated point in VertBuf
|
|
p0 = *(pLoop->VertBuf + pLoop->nVerts - 1);
|
|
|
|
// pointCount should be >=2, but in case it's not...
|
|
p1 = p2 = p0;
|
|
|
|
for (point = 0; point < pointCount - 1; ++point)
|
|
{
|
|
p1.x = ofc->scale * GetFixed(pp);
|
|
p1.y = ofc->scale * GetFixed(pp);
|
|
|
|
if (point == pointCount - 2)
|
|
{
|
|
/*
|
|
* This is the last arc in the QSpline. The final
|
|
* point is the end of the arc.
|
|
*/
|
|
p2.x = ofc->scale * GetFixed(pp);
|
|
p2.y = ofc->scale * GetFixed(pp);
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* Peek at the next point in the input to compute
|
|
* the end of the arc:
|
|
*/
|
|
p.x = ofc->scale * GetFixed(pp);
|
|
p.y = ofc->scale * GetFixed(pp);
|
|
p2.x = 0.5f * (p1.x + p.x);
|
|
p2.y = 0.5f * (p1.y + p.y);
|
|
/*
|
|
* Push the point back onto the input so it will
|
|
* be reused as the next off-curve point:
|
|
*/
|
|
*pp -= 2*sizeof(FIXED); // x and y
|
|
}
|
|
|
|
if( !MakeLinesFromArc( ofc,
|
|
pLoop,
|
|
pPrim,
|
|
p0,
|
|
p1,
|
|
p2,
|
|
ofc->chordalDeviation * ofc->chordalDeviation))
|
|
return WFO_FAILURE;
|
|
|
|
// p0 is now the last interpolated point (p2)
|
|
p0 = p2;
|
|
}
|
|
|
|
// put in last point in arc
|
|
if( !AppendToVertBuf( pLoop, pPrim, &p2 ) )
|
|
return WFO_FAILURE;
|
|
|
|
return WFO_SUCCESS;
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
* MakeLinesFromArc
|
|
*
|
|
* Subdivides one arc of a quadratic spline until the chordal deviation
|
|
* tolerance requirement is met, then places the resulting set of line
|
|
* segments in the Loop.
|
|
|
|
*****************************************************************************/
|
|
|
|
static BOOL
|
|
MakeLinesFromArc( IN OFContext *ofc,
|
|
IN LOOP* pLoop,
|
|
IN PRIM* pPrim,
|
|
IN POINT2D p0,
|
|
IN POINT2D p1,
|
|
IN POINT2D p2,
|
|
IN FLOAT chordalDeviationSquared)
|
|
{
|
|
POINT2D p01;
|
|
POINT2D p12;
|
|
POINT2D midPoint;
|
|
FLOAT deltaX;
|
|
FLOAT deltaY;
|
|
|
|
/*
|
|
* Calculate midpoint of the curve by de Casteljau:
|
|
*/
|
|
p01.x = 0.5f * (p0.x + p1.x);
|
|
p01.y = 0.5f * (p0.y + p1.y);
|
|
p12.x = 0.5f * (p1.x + p2.x);
|
|
p12.y = 0.5f * (p1.y + p2.y);
|
|
midPoint.x = 0.5f * (p01.x + p12.x);
|
|
midPoint.y = 0.5f * (p01.y + p12.y);
|
|
|
|
|
|
/*
|
|
* Estimate chordal deviation by the distance from the midpoint
|
|
* of the curve to its non-interpolated control point. If this
|
|
* distance is greater than the specified chordal deviation
|
|
* constraint, then subdivide. Otherwise, generate polylines
|
|
* from the three control points.
|
|
*/
|
|
deltaX = midPoint.x - p1.x;
|
|
deltaY = midPoint.y - p1.y;
|
|
if (deltaX * deltaX + deltaY * deltaY > chordalDeviationSquared)
|
|
{
|
|
if( !MakeLinesFromArc( ofc, pLoop, pPrim,
|
|
p0,
|
|
p01,
|
|
midPoint,
|
|
chordalDeviationSquared) )
|
|
return WFO_FAILURE;
|
|
|
|
if( !MakeLinesFromArc( ofc, pLoop, pPrim,
|
|
midPoint,
|
|
p12,
|
|
p2,
|
|
chordalDeviationSquared) )
|
|
return WFO_FAILURE;
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* The "pen" is already at (x0, y0), so we don't need to
|
|
* add that point to the LineBuf.
|
|
*/
|
|
if( !AppendToVertBuf( pLoop, pPrim, &p1 ) )
|
|
return WFO_FAILURE;
|
|
}
|
|
|
|
return WFO_SUCCESS;
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
* ApplyVertexFilter
|
|
*
|
|
* Filter the vertex buffer to get rid of redundant vertices.
|
|
* These can occur on Primitive boundaries.
|
|
|
|
*****************************************************************************/
|
|
static void ApplyVertexFilter( LOOP_LIST *pLoopList )
|
|
{
|
|
DWORD nLoops;
|
|
LOOP *pLoop;
|
|
|
|
nLoops = pLoopList->nLoops;
|
|
pLoop = pLoopList->LoopBuf;
|
|
|
|
for( ; nLoops; nLoops--, pLoop++ ) {
|
|
CheckRedundantVertices( pLoop );
|
|
}
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* CheckRedundantVertices
|
|
*
|
|
* Check for redundant vertices on Curve-Curve boundaries (including loop
|
|
* closure), and get rid of them, using in-place algorithm.
|
|
|
|
*****************************************************************************/
|
|
|
|
static void CheckRedundantVertices( LOOP *pLoop )
|
|
{
|
|
PRIM *pPrim, *pNextPrim;
|
|
DWORD primType, nextPrimType, nVerts;
|
|
BOOL bEliminate, bLastEliminate;
|
|
DWORD nEliminated=0, nPrims;
|
|
POINT2D *pVert, *pVert2ndToLast;
|
|
|
|
nPrims = pLoop->nPrims;
|
|
if( nPrims < 2 )
|
|
return;
|
|
|
|
pPrim = pLoop->PrimBuf;
|
|
pNextPrim = pPrim + 1;
|
|
|
|
nPrims--; // the last prim is dealt with afterwards
|
|
for( ; nPrims; nPrims--, pPrim = pNextPrim++ ) {
|
|
bEliminate = FALSE;
|
|
nVerts = pPrim->nVerts;
|
|
|
|
// check spline<->* boundaries
|
|
if( (pPrim->nVerts >= 2) &&
|
|
((pPrim->primType == PRIM_CURVE ) ||
|
|
(pNextPrim->primType == PRIM_CURVE )) ) {
|
|
|
|
/* get ptr to 2nd-to-last vertex in current prim
|
|
* !! Note that last vertex in current prim and first vertex in
|
|
* next prim are the same.
|
|
*/
|
|
pVert2ndToLast = pPrim->pVert + pPrim->nVerts - 2;
|
|
if( PointsColinear( pVert2ndToLast,
|
|
pVert2ndToLast+1,
|
|
pNextPrim->pVert+1 ) ) {
|
|
// we eliminate last vertex in current prim
|
|
bEliminate = TRUE;
|
|
pPrim->nVerts--;
|
|
nVerts--;
|
|
}
|
|
}
|
|
|
|
/* move vertices up in vertBuf if necessary (if any vertices
|
|
* were PREVIOUSLY eliminated)
|
|
*/
|
|
if( nEliminated ) {
|
|
pVert = pPrim->pVert - nEliminated; // new pVert
|
|
memcpy( pVert+1, pPrim->pVert+1, (nVerts-1)*sizeof(POINT2D));
|
|
pPrim->pVert = pVert;
|
|
}
|
|
if( bEliminate ) {
|
|
nEliminated += 1;
|
|
}
|
|
}
|
|
|
|
/* also check for redundancy at closure:
|
|
* - replace firstPrim's first vertex with 2nd-to-last of last prim
|
|
* - eliminate last vertex in last prim
|
|
*/
|
|
bLastEliminate = bEliminate;
|
|
bEliminate = FALSE;
|
|
nVerts = pPrim->nVerts;
|
|
pNextPrim = pLoop->PrimBuf; // first prim in loop
|
|
|
|
if( (pPrim->nVerts >= 2) &&
|
|
((pPrim->primType == PRIM_CURVE ) ||
|
|
(pNextPrim->primType == PRIM_CURVE )) ) {
|
|
|
|
POINT2D *pVertLast;
|
|
|
|
pVert2ndToLast = pPrim->pVert + pPrim->nVerts - 2; // always >=2 verts
|
|
pVertLast = pVert2ndToLast + 1;
|
|
|
|
if( (pPrim->nVerts == 2) && bLastEliminate )
|
|
/* 2ndToLast vert (same as first vert) of this prim has
|
|
* been eliminated. Deal with it by backing up the ptr.
|
|
* This didn't matter in above loop, because there wasn't the
|
|
* possibility of munging the first vertex in the loop
|
|
*/
|
|
pVert2ndToLast--;
|
|
|
|
// point to 2nd-to-last vertex in prim
|
|
if( PointsColinear( pVert2ndToLast,
|
|
pVertLast,
|
|
pNextPrim->pVert+1 ) ) {
|
|
bEliminate = TRUE;
|
|
pPrim->nVerts--;
|
|
// munge first prim's first vertex
|
|
/* problem here if have 2 eliminations in a row, and pPrim was
|
|
* a 2 vertex prim - then pVert2ndToLast is pointing to an
|
|
* eliminated vertex
|
|
*/
|
|
*(pNextPrim->pVert) = *(pVert2ndToLast);
|
|
nVerts--;
|
|
}
|
|
}
|
|
|
|
// move up last prim's vertices if necessary
|
|
if( nEliminated ) {
|
|
pVert = pPrim->pVert - nEliminated; // new pVert
|
|
memcpy( pVert+1, pPrim->pVert+1, (nVerts-1)*sizeof(POINT2D) );
|
|
// This misses copying one vertex
|
|
pPrim->pVert = pVert;
|
|
}
|
|
|
|
if( bEliminate ) {
|
|
nEliminated += 1;
|
|
}
|
|
|
|
// now update vertex count in Loop
|
|
pLoop->nVerts -= nEliminated;
|
|
|
|
// Check for prims with nVerts=1 (invalidated), and remove them
|
|
|
|
nPrims = pLoop->nPrims;
|
|
pPrim = pLoop->PrimBuf;
|
|
nEliminated = 0;
|
|
for( ; nPrims; nPrims--, pPrim++ ) {
|
|
if( pPrim->nVerts == 1 ) {
|
|
nEliminated++;
|
|
continue;
|
|
}
|
|
*(pPrim-nEliminated) = *pPrim;
|
|
}
|
|
pLoop->nPrims -= nEliminated;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* PointsColinear
|
|
*
|
|
* Returns TRUE if the 3 points are colinear enough.
|
|
|
|
*****************************************************************************/
|
|
|
|
static BOOL PointsColinear( POINT2D *p1,
|
|
POINT2D *p2,
|
|
POINT2D *p3 )
|
|
{
|
|
POINT2D v1, v2;
|
|
|
|
// compare slopes of the 2 vectors? - optimize later
|
|
if( POINT2DEQUAL( p1, p2 ) || POINT2DEQUAL( p2, p3 ) )
|
|
// avoid sending 0 vector to CalcAngle (generates FPE)
|
|
return TRUE;
|
|
|
|
v1.x = p2->x - p1->x;
|
|
v1.y = p2->y - p1->y;
|
|
v2.x = p3->x - p2->x;
|
|
v2.y = p3->y - p2->y;
|
|
if( fabs(CalcAngle( &v1, &v2 )) < CoplanarThresholdAngle )
|
|
return TRUE;
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
* CreateOFContext
|
|
*
|
|
* Create and initialize the outline font context.
|
|
*
|
|
* History:
|
|
* 26-Sep-1995 -by- Marc Fortier [marcfo]
|
|
* Use extrusioniser to draw polygonal faces with extrusion=0
|
|
|
|
*****************************************************************************/
|
|
|
|
static OFContext* CreateOFContext( HDC hdc,
|
|
FLOAT chordalDeviation,
|
|
FLOAT extrusion,
|
|
INT format,
|
|
BOOL bUnicode )
|
|
{
|
|
OFContext *ofc = (OFContext *) NULL;
|
|
BOOL status = WFO_FAILURE;
|
|
|
|
// validate parameters
|
|
|
|
if( (format != WGL_FONT_LINES) && (format != WGL_FONT_POLYGONS) ) {
|
|
WARNING("wglUseFontOutlines: invalid format parameter\n");
|
|
SetLastError(ERROR_INVALID_PARAMETER);
|
|
return NULL;
|
|
}
|
|
|
|
if( chordalDeviation < 0.0f ) {
|
|
WARNING("wglUseFontOutlines: invalid deviation parameter\n");
|
|
SetLastError(ERROR_INVALID_PARAMETER);
|
|
return NULL;
|
|
}
|
|
|
|
if( extrusion < 0.0f ) {
|
|
WARNING("wglUseFontOutlines: invalid extrusion parameter\n");
|
|
SetLastError(ERROR_INVALID_PARAMETER);
|
|
return NULL;
|
|
}
|
|
|
|
ofc = (OFContext *) ALLOCZ( sizeof(OFContext) );
|
|
|
|
if( !ofc )
|
|
return NULL;
|
|
|
|
ofc->format = format;
|
|
ofc->chordalDeviation = chordalDeviation;
|
|
|
|
if( !ScaleFont( hdc, ofc, bUnicode ) )
|
|
goto exit;
|
|
|
|
// handle extrusion
|
|
#ifdef VARRAY
|
|
if( !((format == WGL_FONT_LINES) && (extrusion == 0.0f)) ) {
|
|
#else
|
|
if( extrusion != 0.0f ) {
|
|
#endif
|
|
ofc->ec = extr_Init( extrusion, format );
|
|
if( !ofc->ec ) {
|
|
goto exit;
|
|
}
|
|
} else {
|
|
ofc->ec = (EXTRContext *) NULL;
|
|
}
|
|
|
|
// init a tess obj
|
|
ofc->tess = NULL;
|
|
if( ofc->format == WGL_FONT_POLYGONS ) {
|
|
GLUtesselator *tess;
|
|
|
|
if (!(tess = gluNewTess()))
|
|
goto exit;
|
|
|
|
if( ofc->ec ) {
|
|
gluTessCallback(tess, GLU_TESS_BEGIN_DATA,
|
|
(void(CALLBACK*)()) extr_glBegin);
|
|
gluTessCallback(tess, GLU_TESS_END,
|
|
(void(CALLBACK*)()) extr_glEnd);
|
|
gluTessCallback(tess, GLU_TESS_VERTEX_DATA,
|
|
(void(CALLBACK*)()) extr_glVertex);
|
|
} else {
|
|
gluTessCallback(tess, GLU_BEGIN, (void(CALLBACK*)()) glBegin);
|
|
gluTessCallback(tess, GLU_END, (void(CALLBACK*)()) glEnd);
|
|
gluTessCallback(tess, GLU_VERTEX, (void(CALLBACK*)()) glVertex2fv);
|
|
}
|
|
gluTessCallback(tess, GLU_TESS_ERROR_DATA,
|
|
(void(CALLBACK*)()) TessError);
|
|
gluTessCallback(tess, GLU_TESS_COMBINE_DATA,
|
|
(void(CALLBACK*)()) TessCombine);
|
|
|
|
// set tesselator normal and winding rule
|
|
|
|
gluTessNormal( tess, 0.0, 0.0, 1.0 );
|
|
gluTessProperty( tess, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_NONZERO);
|
|
|
|
ofc->tess = tess;
|
|
}
|
|
|
|
status = WFO_SUCCESS;
|
|
|
|
exit:
|
|
if( !status ) {
|
|
DestroyOFContext( hdc, ofc );
|
|
return NULL;
|
|
}
|
|
return ofc;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* ScaleFont
|
|
*
|
|
* To get the best representation of the font, we use its design height, or
|
|
* the emSquare size. We then scale emSquare to 1.0.
|
|
* A maxChordTolerance value is set, otherwise it was found that some
|
|
* glyphs displayed ugly loop intersections. The value .035f was chosen
|
|
* after cursory examination of the glyphs.
|
|
*
|
|
* History:
|
|
* 31-Jul-1995 -by- [marcfo]
|
|
* Get rid of unicode functions - since we're just accessing text metrics,
|
|
* the default 'string' functions should work on all platforms.
|
|
*****************************************************************************/
|
|
|
|
static BOOL
|
|
ScaleFont( HDC hdc, OFContext *ofc, BOOL bUnicode )
|
|
{
|
|
OUTLINETEXTMETRIC otm;
|
|
HFONT hfont;
|
|
LOGFONT lf;
|
|
DWORD textMetricsSize;
|
|
FLOAT scale, maxChordTolerance=0.035f;
|
|
UINT otmEMSquare;
|
|
|
|
// Query font metrics
|
|
|
|
if( GetOutlineTextMetrics( hdc, sizeof(otm), &otm) <= 0 )
|
|
// cmd failed, or buffer size=0
|
|
return WFO_FAILURE;
|
|
|
|
otmEMSquare = otm.otmEMSquare;
|
|
|
|
/*
|
|
* The font data is scaled, so that 1.0 maps to the font's em square
|
|
* size. Note that it is still possible for glyphs to extend beyond
|
|
* this square.
|
|
*/
|
|
scale = 1.0f / (FLOAT) otmEMSquare;
|
|
|
|
// create new font object, using largest size
|
|
|
|
hfont = GetCurrentObject( hdc, OBJ_FONT );
|
|
GetObject( hfont, sizeof(LOGFONT), &lf );
|
|
lf.lfHeight = otmEMSquare;
|
|
lf.lfWidth = 0; // this will choose default width for the height
|
|
hfont = CreateFontIndirect(&lf);
|
|
|
|
// select new font into DC, and save current font
|
|
ofc->hfontOld = SelectObject( hdc, hfont );
|
|
|
|
// set ofc values
|
|
|
|
ofc->scale = scale;
|
|
|
|
/* check chord tolerance: in design space, minimum chord tolerance is
|
|
* ~1 logical unit, = ofc->scale.
|
|
*/
|
|
if( ofc->chordalDeviation == 0.0f ) {
|
|
// select minimum tolerance in this case
|
|
ofc->chordalDeviation = ofc->scale;
|
|
}
|
|
/* also impose a maximum, or things can get ugly */
|
|
else if( ofc->chordalDeviation > maxChordTolerance ) {
|
|
// XXX might want to change maxChordTolerance based on scale ?
|
|
ofc->chordalDeviation = maxChordTolerance;
|
|
}
|
|
|
|
return WFO_SUCCESS;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* DestroyOFContext
|
|
*
|
|
*****************************************************************************/
|
|
|
|
static void
|
|
DestroyOFContext( HDC hdc, OFContext* ofc )
|
|
{
|
|
HFONT hfont;
|
|
|
|
if( ofc->ec ) {
|
|
extr_Finish( ofc->ec );
|
|
}
|
|
|
|
// put back original font object
|
|
if( ofc->hfontOld ) {
|
|
hfont = SelectObject( hdc, ofc->hfontOld );
|
|
DeleteObject( hfont );
|
|
}
|
|
|
|
if( ofc->format == WGL_FONT_POLYGONS ) {
|
|
if( ofc->tess )
|
|
gluDeleteTess( ofc->tess );
|
|
}
|
|
|
|
FREE( ofc );
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* InitLoopBuf
|
|
*
|
|
* Initializes a LOOP_LIST structure for the Loops of each glyph.
|
|
|
|
*****************************************************************************/
|
|
|
|
static LOOP_LIST*
|
|
InitLoopBuf( void )
|
|
{
|
|
LOOP *pLoop;
|
|
LOOP_LIST *pLoopList;
|
|
DWORD initSize = 10;
|
|
|
|
pLoopList = (LOOP_LIST*) ALLOC( sizeof(LOOP_LIST) );
|
|
if( !pLoopList )
|
|
return( (LOOP_LIST *) NULL );
|
|
|
|
pLoop = (LOOP*) ALLOC( initSize * sizeof(LOOP) );
|
|
if( !pLoop ) {
|
|
FREE( pLoopList );
|
|
return( (LOOP_LIST *) NULL );
|
|
}
|
|
|
|
pLoopList->LoopBuf = pLoop;
|
|
pLoopList->nLoops = 0;
|
|
pLoopList->LoopBufSize = initSize;
|
|
|
|
return pLoopList;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* NewLoop
|
|
*
|
|
* Create a new LOOP structure. The first point in the loop is supplied.
|
|
|
|
*****************************************************************************/
|
|
|
|
static LOOP*
|
|
NewLoop( LOOP_LIST *pLoopList, POINT2D *pFirstPoint )
|
|
{
|
|
LOOP *pNewLoop;
|
|
PRIM *pPrim;
|
|
POINT2D *pVert;
|
|
DWORD size = 50;
|
|
|
|
if( pLoopList->nLoops >= pLoopList->LoopBufSize)
|
|
{
|
|
// need to increase size of LoopBuf
|
|
LOOP *pLoop;
|
|
|
|
pLoop = (LOOP*) REALLOC(pLoopList->LoopBuf,
|
|
(pLoopList->LoopBufSize += size) *
|
|
sizeof(LOOP));
|
|
if( !pLoop )
|
|
return (LOOP *) NULL;
|
|
pLoopList->LoopBuf = pLoop;
|
|
}
|
|
|
|
pNewLoop = pLoopList->LoopBuf + pLoopList->nLoops;
|
|
|
|
// give the loop a block of prims to work with
|
|
pPrim = (PRIM *) ALLOC( size * sizeof(PRIM) );
|
|
if( !pPrim )
|
|
return (LOOP *) NULL;
|
|
pNewLoop->PrimBuf = pPrim;
|
|
pNewLoop->nPrims = 0;
|
|
pNewLoop->PrimBufSize = size;
|
|
|
|
// give the loop a block of vertices to work with
|
|
pVert = (POINT2D*) ALLOC( size * sizeof(POINT2D) );
|
|
if( !pVert ) {
|
|
FREE( pPrim );
|
|
return (LOOP *) NULL;
|
|
}
|
|
pNewLoop->VertBuf = pVert;
|
|
pNewLoop->nVerts = 0;
|
|
pNewLoop->VertBufSize = size;
|
|
|
|
// stick that first point in
|
|
pVert->x = pFirstPoint->x;
|
|
pVert->y = pFirstPoint->y;
|
|
pNewLoop->nVerts++;
|
|
|
|
// normal buffers - used by extrusion
|
|
pNewLoop->FNormBuf = (POINT3D *) NULL;
|
|
pNewLoop->VNormBuf = (POINT3D *) NULL;
|
|
|
|
pLoopList->nLoops++; // increment loop count
|
|
|
|
return pNewLoop;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* NewPrim
|
|
*
|
|
* Create a new PRIM structure. The primType is supplied.
|
|
|
|
*****************************************************************************/
|
|
|
|
static PRIM*
|
|
NewPrim( LOOP *pLoop, DWORD primType )
|
|
{
|
|
PRIM *pNewPrim;
|
|
POINT2D *pVert;
|
|
DWORD size = 50;
|
|
|
|
if( pLoop->nPrims >= pLoop->PrimBufSize)
|
|
{
|
|
// need to increase size of PrimBuf
|
|
PRIM *pPrim;
|
|
|
|
pPrim = (PRIM *) REALLOC(pLoop->PrimBuf,
|
|
(pLoop->PrimBufSize += size) * sizeof(PRIM));
|
|
if( !pPrim )
|
|
return (PRIM *) NULL;
|
|
pLoop->PrimBuf = pPrim;
|
|
}
|
|
|
|
pNewPrim = pLoop->PrimBuf + pLoop->nPrims;
|
|
// translate primType to extrusion prim type
|
|
primType = (primType == TT_PRIM_LINE) ? PRIM_LINE : PRIM_CURVE;
|
|
pNewPrim->primType = primType;
|
|
pNewPrim->nVerts = 1; // since we include last point:
|
|
/*
|
|
* VertIndex must point to the last point of the previous prim
|
|
*/
|
|
pNewPrim->VertIndex = pLoop->nVerts - 1;
|
|
// normal pointers - used by extrusion
|
|
pNewPrim->pFNorm = (POINT3D *) NULL;
|
|
pNewPrim->pVNorm = (POINT3D *) NULL;
|
|
|
|
pLoop->nPrims++; // increment prim count
|
|
|
|
return pNewPrim;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* FreeLoopList
|
|
*
|
|
* Free up all memory associated with processing a glyph.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
static void
|
|
FreeLoopList( LOOP_LIST *pLoopList )
|
|
{
|
|
DWORD nLoops;
|
|
|
|
if( !pLoopList )
|
|
return;
|
|
|
|
if( pLoopList->LoopBuf ) {
|
|
// free up each loop
|
|
LOOP *pLoop = pLoopList->LoopBuf;
|
|
|
|
nLoops = pLoopList->nLoops;
|
|
for( ; nLoops; nLoops--, pLoop++ ) {
|
|
if( pLoop->PrimBuf )
|
|
FREE( pLoop->PrimBuf );
|
|
if( pLoop->VertBuf )
|
|
FREE( pLoop->VertBuf );
|
|
}
|
|
FREE( pLoopList->LoopBuf );
|
|
}
|
|
FREE( pLoopList );
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* AppendToVertBuf
|
|
*
|
|
* Append a vertex to the Loop's VertBuf
|
|
|
|
*****************************************************************************/
|
|
|
|
static BOOL
|
|
AppendToVertBuf( LOOP *pLoop,
|
|
PRIM *pPrim,
|
|
POINT2D *p )
|
|
{
|
|
if( pLoop->nVerts >= pLoop->VertBufSize)
|
|
{
|
|
POINT2D *vertBuf;
|
|
DWORD size = 100;
|
|
|
|
vertBuf = (POINT2D *) REALLOC(pLoop->VertBuf,
|
|
(pLoop->VertBufSize += size) *
|
|
sizeof(POINT2D));
|
|
if( !vertBuf )
|
|
return WFO_FAILURE;
|
|
pLoop->VertBuf = vertBuf;
|
|
}
|
|
pLoop->VertBuf[pLoop->nVerts] = *p;
|
|
pLoop->nVerts++;
|
|
pPrim->nVerts++;
|
|
return WFO_SUCCESS;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* CalcVertPtrs
|
|
*
|
|
* Calculate vertex ptrs from index values for the prims in a loop.
|
|
|
|
*****************************************************************************/
|
|
|
|
static void
|
|
CalcVertPtrs( LOOP *pLoop )
|
|
{
|
|
DWORD nPrims;
|
|
PRIM *pPrim;
|
|
|
|
nPrims = pLoop->nPrims;
|
|
pPrim = pLoop->PrimBuf;
|
|
|
|
for( ; nPrims; pPrim++, nPrims-- ) {
|
|
pPrim->pVert = pLoop->VertBuf + pPrim->VertIndex;
|
|
}
|
|
}
|
|
|
|
|
|
/*****************************************************************************
|
|
* GetFixed
|
|
*
|
|
* Fetch the next 32-bit fixed-point value from a little-endian byte stream,
|
|
* convert it to floating-point, and increment the stream pointer to the next
|
|
* unscanned byte.
|
|
|
|
*****************************************************************************/
|
|
|
|
static FLOAT GetFixed(UCHAR** p)
|
|
{
|
|
FLOAT value;
|
|
FLOAT fraction;
|
|
|
|
fraction = ((FLOAT) (UINT) GetWord(p)) / 65536.0f;
|
|
value = (FLOAT) GetSignedWord(p);
|
|
|
|
return value+fraction;
|
|
}
|
|
|
|
#ifdef FONT_DEBUG
|
|
void
|
|
DrawColorCodedLineLoop( LOOP *pLoop, FLOAT zextrusion )
|
|
{
|
|
POINT2D *p;
|
|
DWORD nPrims;
|
|
DWORD nVerts;
|
|
PRIM *pPrim;
|
|
|
|
nPrims = pLoop->nPrims;
|
|
pPrim = pLoop->PrimBuf;
|
|
for( ; nPrims; nPrims--, pPrim++ ) {
|
|
|
|
if( pPrim->primType == PRIM_LINE ) {
|
|
if( nPrims == pLoop->nPrims ) // first prim
|
|
glColor3d( 0.5, 0.0, 0.0 );
|
|
else
|
|
glColor3d( 1.0, 0.0, 0.0 );
|
|
} else {
|
|
if( nPrims == pLoop->nPrims ) // first prim
|
|
glColor3d( 0.5, 0.5, 0.0 );
|
|
else
|
|
glColor3d( 1.0, 1.0, 0.0 );
|
|
}
|
|
|
|
nVerts = pPrim->nVerts;
|
|
p = pPrim->pVert;
|
|
glBegin(GL_LINE_STRIP);
|
|
for( ; nVerts; nVerts--, p++ ) {
|
|
glVertex3f( p->x, p->y, zextrusion );
|
|
}
|
|
glEnd();
|
|
#define DRAW_POINTS 1
|
|
#ifdef DRAW_POINTS
|
|
glColor3d( 0.0, 0.5, 0.0 );
|
|
nVerts = pPrim->nVerts;
|
|
p = pPrim->pVert;
|
|
glPointSize( 4.0f );
|
|
glBegin( GL_POINTS );
|
|
for( ; nVerts; nVerts--, p++ ) {
|
|
glVertex3f( p->x, p->y, zextrusion );
|
|
}
|
|
glEnd();
|
|
#endif
|
|
}
|
|
|
|
// Draw bright green point at start of loop
|
|
if( pLoop->nVerts ) {
|
|
glColor3d( 0.0, 1.0, 0.0 );
|
|
glPointSize( 4.0f );
|
|
glBegin( GL_POINTS );
|
|
p = pLoop->VertBuf;
|
|
glVertex3f( p->x, p->y, zextrusion );
|
|
glEnd();
|
|
glPointSize( 1.0f );
|
|
}
|
|
|
|
}
|
|
#endif
|