src/libnrtype/FontInstance.cpp

	FontInstance.cpp revision 762dce10221fb58420527d8554cd5960c03e0eda
/*
 *  FontInstance.cpp
 *  testICU
 *
 *   Authors:
 *     fred
 *     bulia byak <buliabyak@users.sf.net>
 *
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <libnr/nr-rect.h>
#include <libnrtype/font-glyph.h>
#include <libnrtype/font-instance.h>

#include <livarot/Path.h>

#include "RasterFont.h"

/* Freetype 2 */
# include <ft2build.h>
# include FT_OUTLINE_H
# include FT_BBOX_H
# include FT_TRUETYPE_TAGS_H
# include FT_TRUETYPE_TABLES_H
# include <pango/pangoft2.h>


size_t  font_style_hash::operator()(const font_style &x) const {
    int      h=0,n;
    n=(int)floor(100*x.stroke_width);
    h*=12186;
    h+=n;
    n=(x.vertical)?1:0;
    h*=12186;
    h+=n;
    if ( x.stroke_width >= 0.01 ) {
        n=x.stroke_cap*10+x.stroke_join+(int)(x.stroke_miter_limit*100);
        h*=12186;
        h+=n;
        if ( x.nbDash > 0 ) {
            n=x.nbDash;
            h*=12186;
            h+=n;
            n=(int)floor(100*x.dash_offset);
            h*=12186;
            h+=n;
            for (int i=0;i<x.nbDash;i++) {
                n=(int)floor(100*x.dashes[i]);
                h*=12186;
                h+=n;
            }
        }
    }
    return h;
}

bool  font_style_equal::operator()(const font_style &a,const font_style &b) {
    for (int i=0;i<6;i++) {
        if ( (int)(100*a.transform[i]) != (int)(100*b.transform[i]) ) return false;
    }
    if ( a.vertical && b.vertical == false ) return false;
    if ( a.vertical == false && b.vertical ) return false;
    if ( a.stroke_width > 0.01 && b.stroke_width <= 0.01 ) return false;
    if ( a.stroke_width <= 0.01 && b.stroke_width > 0.01 ) return false;
    if ( a.stroke_width <= 0.01 && b.stroke_width <= 0.01 ) return true;

    if ( a.stroke_cap != b.stroke_cap ) return false;
    if ( a.stroke_join != b.stroke_join ) return false;
    if ( (int)(a.stroke_miter_limit*100) != (int)(b.stroke_miter_limit*100) ) return false;
    if ( a.nbDash != b.nbDash ) return false;
    if ( a.nbDash <= 0 ) return true;
    if ( (int)floor(100*a.dash_offset) != (int)floor(100*b.dash_offset) ) return false;
    for (int i=0;i<a.nbDash;i++) {
        if ( (int)floor(100*a.dashes[i]) != (int)floor(100*b.dashes[i]) ) return false;
    }
    return true;
}

#ifndef USE_PANGO_WIN32
/*
 * Outline extraction
 */
typedef struct ft2_to_liv {
    Path*        theP;
    double       scale;
    NR::Point    last;
} ft2_to_liv;

// Note: Freetype 2.2.1 redefined function signatures for functions to be placed in an
// FT_Outline_Funcs structure.  This is needed to keep backwards compatibility with the
// 2.1.x series.

/* *** BEGIN #if HACK *** */
#if FREETYPE_MAJOR == 2 && FREETYPE_MINOR >= 2
typedef FT_Vector const FREETYPE_VECTOR;
#else
typedef FT_Vector FREETYPE_VECTOR;
#endif

// outline as returned by freetype -> livarot Path
// see nr-type-ft2.cpp for the freetype -> artBPath on which this code is based
static int ft2_move_to(FREETYPE_VECTOR *to, void * i_user) {
    ft2_to_liv* user=(ft2_to_liv*)i_user;
    NR::Point   p(user->scale*to->x,user->scale*to->y);
    //  printf("m  t=%f %f\n",p[0],p[1]);
    user->theP->MoveTo(p);
    user->last=p;
    return 0;
}

static int ft2_line_to(FREETYPE_VECTOR *to, void *i_user)
{
    ft2_to_liv* user=(ft2_to_liv*)i_user;
    NR::Point   p(user->scale*to->x,user->scale*to->y);
    //  printf("l  t=%f %f\n",p[0],p[1]);
    user->theP->LineTo(p);
    user->last=p;
    return 0;
}

static int ft2_conic_to(FREETYPE_VECTOR *control, FREETYPE_VECTOR *to, void *i_user)
{
    ft2_to_liv* user=(ft2_to_liv*)i_user;
    NR::Point   p(user->scale*to->x,user->scale*to->y),c(user->scale*control->x,user->scale*control->y);
    //  printf("b c=%f %f  t=%f %f\n",c[0],c[1],p[0],p[1]);
    user->theP->BezierTo(p);
    user->theP->IntermBezierTo(c);
    user->theP->EndBezierTo();
    user->last=p;
    return 0;
}

static int ft2_cubic_to(FREETYPE_VECTOR *control1, FREETYPE_VECTOR *control2, FREETYPE_VECTOR *to, void *i_user)
{
    ft2_to_liv* user=(ft2_to_liv*)i_user;
    NR::Point   p(user->scale*to->x,user->scale*to->y),
    c1(user->scale*control1->x,user->scale*control1->y),
    c2(user->scale*control2->x,user->scale*control2->y);
    //  printf("c c1=%f %f  c2=%f %f   t=%f %f\n",c1[0],c1[1],c2[0],c2[1],p[0],p[1]);
    user->theP->CubicTo(p,3*(c1-user->last),3*(p-c2));
    user->last=p;
    return 0;
}
#endif

/* *** END #if HACK *** */

/*
 *
 */

font_instance::font_instance(void)
{
    //printf("font instance born\n");
    descr=NULL;
    pFont=NULL;
    refCount=0;
    daddy=NULL;
    nbGlyph=maxGlyph=0;
    glyphs=NULL;
    theFace=NULL;
}

font_instance::~font_instance(void)
{
    if ( daddy ) daddy->UnrefFace(this);
    //printf("font instance death\n");
    if ( pFont ) g_object_unref(pFont);
    pFont=NULL;
    if ( descr ) pango_font_description_free(descr);
    descr=NULL;
    //  if ( theFace ) FT_Done_Face(theFace); // owned by pFont. don't touch
    theFace=NULL;

    for (int i=0;i<nbGlyph;i++) {
        if ( glyphs[i].outline ) delete glyphs[i].outline;
        if ( glyphs[i].artbpath ) free(glyphs[i].artbpath);
    }
    if ( glyphs ) free(glyphs);
    nbGlyph=maxGlyph=0;
    glyphs=NULL;
}

void font_instance::Ref(void)
{
    refCount++;
    //char *tc=pango_font_description_to_string(descr);
    //printf("font %x %s ref'd %i\n",this,tc,refCount);
    //free(tc);
}

void font_instance::Unref(void)
{
    refCount--;
    //char *tc=pango_font_description_to_string(descr);
    //printf("font %x %s unref'd %i\n",this,tc,refCount);
    //free(tc);
    if ( refCount <= 0 ) {
        if ( daddy ) daddy->UnrefFace(this);
        daddy=NULL;
        delete this;
    }
}

unsigned int font_instance::Name(gchar *str, unsigned int size)
{
    return Attribute("name", str, size);
}

unsigned int font_instance::Family(gchar *str, unsigned int size)
{
    return Attribute("family", str, size);
}

unsigned int font_instance::PSName(gchar *str, unsigned int size)
{
    return Attribute("psname", str, size);
}

unsigned int font_instance::Attribute(const gchar *key, gchar *str, unsigned int size)
{
    if ( descr == NULL ) {
        if ( size > 0 ) str[0]=0;
        return 0;
    }
    char*   res=NULL;
    bool    free_res=false;

    if ( strcmp(key,"name") == 0 ) {
        PangoFontDescription* td=pango_font_description_copy(descr);
        pango_font_description_unset_fields (td, PANGO_FONT_MASK_SIZE);
        res=pango_font_description_to_string (td);
        pango_font_description_free(td);
        free_res=true;
    } else if ( strcmp(key,"psname") == 0 ) {
#ifndef USE_PANGO_WIN32
         res = (char *) FT_Get_Postscript_Name (theFace); // that's the main method, seems to always work
#endif
         free_res=false;
         if (res == NULL) { // a very limited workaround, only bold, italic, and oblique will work
             PangoStyle style=pango_font_description_get_style(descr);
             bool i = (style == PANGO_STYLE_ITALIC);
             bool o = (style == PANGO_STYLE_OBLIQUE);
             PangoWeight weight=pango_font_description_get_weight(descr);
             bool b = (weight >= PANGO_WEIGHT_BOLD);

             res = g_strdup_printf ("%s%s%s%s",
                                    pango_font_description_get_family(descr),
                                    (b || i || o) ? "-" : "",
                                    (b) ? "Bold" : "",
                                    (i) ? "Italic" : ((o) ? "Oblique" : "")  );
             free_res = true;
         }
    } else if ( strcmp(key,"family") == 0 ) {
        res=(char*)pango_font_description_get_family(descr);
        free_res=false;
    } else if ( strcmp(key,"style") == 0 ) {
        PangoStyle v=pango_font_description_get_style(descr);
        if ( v == PANGO_STYLE_ITALIC ) {
            res="italic";
        } else if ( v == PANGO_STYLE_OBLIQUE ) {
            res="oblique";
        } else {
            res="normal";
        }
        free_res=false;
    } else if ( strcmp(key,"weight") == 0 ) {
        PangoWeight v=pango_font_description_get_weight(descr);
        if ( v <= PANGO_WEIGHT_ULTRALIGHT ) {
            res="200";
        } else if ( v <= PANGO_WEIGHT_LIGHT ) {
            res="300";
        } else if ( v <= PANGO_WEIGHT_NORMAL ) {
            res="normal";
        } else if ( v <= PANGO_WEIGHT_BOLD ) {
            res="bold";
        } else {
            res="800";
        }
        free_res=false;
    } else if ( strcmp(key,"stretch") == 0 ) {
        PangoStretch v=pango_font_description_get_stretch(descr);
        if ( v <= PANGO_STRETCH_EXTRA_CONDENSED ) {
            res="extra-condensed";
        } else if ( v <= PANGO_STRETCH_CONDENSED ) {
            res="condensed";
        } else if ( v <= PANGO_STRETCH_SEMI_CONDENSED ) {
            res="semi-condensed";
        } else if ( v <= PANGO_STRETCH_NORMAL ) {
            res="normal";
        } else if ( v <= PANGO_STRETCH_SEMI_EXPANDED ) {
            res="semi-expanded";
        } else if ( v <= PANGO_STRETCH_EXPANDED ) {
            res="expanded";
        } else {
            res="extra-expanded";
        }
        free_res=false;
    } else if ( strcmp(key,"variant") == 0 ) {
        PangoVariant v=pango_font_description_get_variant(descr);
        if ( v == PANGO_VARIANT_SMALL_CAPS ) {
            res="small-caps";
        } else {
            res="normal";
        }
        free_res=false;
    } else {
        res = NULL;
        free_res=false;
    }
    if ( res == NULL ) {
        if ( size > 0 ) str[0]=0;
        return 0;
    }

    if (res) {
        unsigned int len=strlen(res);
        unsigned int rlen=(size-1<len)?size-1:len;
        if ( str ) {
            if ( rlen > 0 ) memcpy(str,res,rlen);
            if ( size > 0 ) str[rlen]=0;
        }
        if (free_res) free(res);
        return len;
    }
    return 0;
}

void font_instance::InitTheFace()
{
#ifdef USE_PANGO_WIN32
    if ( !theFace ) {
        LOGFONT *lf=pango_win32_font_logfont(pFont);
        g_assert(lf != NULL);
        theFace=pango_win32_font_cache_load(daddy->pangoFontCache,lf);
        g_free(lf);
    }
    XFORM identity = {1.0, 0.0, 0.0, 1.0, 0.0, 0.0};
    SetWorldTransform(daddy->hScreenDC, &identity);
    SetGraphicsMode(daddy->hScreenDC, GM_COMPATIBLE);
    SelectObject(daddy->hScreenDC,theFace);
#else
    theFace=pango_ft2_font_get_face(pFont);
    if ( theFace )
        FT_Select_Charmap(theFace,ft_encoding_unicode) && FT_Select_Charmap(theFace,ft_encoding_symbol);
#endif
}

void font_instance::FreeTheFace()
{
#ifdef USE_PANGO_WIN32
    SelectObject(daddy->hScreenDC,GetStockObject(SYSTEM_FONT));
    pango_win32_font_cache_unload(daddy->pangoFontCache,theFace);
#endif
    theFace=NULL;
}

void font_instance::InstallFace(PangoFont* iFace)
{
        if ( !iFace )
            return;
    pFont=iFace;

    InitTheFace();

    if ( pFont && IsOutlineFont() == false ) {
        FreeTheFace();
        if ( pFont ) g_object_unref(pFont);
        pFont=NULL;
    }
}

bool    font_instance::IsOutlineFont(void)
{
    if ( pFont == NULL ) return false;
    InitTheFace();
#ifdef USE_PANGO_WIN32
    TEXTMETRIC tm;
    return GetTextMetrics(daddy->hScreenDC,&tm) && tm.tmPitchAndFamily&(TMPF_TRUETYPE|TMPF_DEVICE);
#else
    return FT_IS_SCALABLE(theFace);
#endif
}

int font_instance::MapUnicodeChar(gunichar c)
{
    if ( pFont == NULL ) return 0;
#ifdef USE_PANGO_WIN32
    return pango_win32_font_get_glyph_index(pFont,c);
#else
    int res=0;
    theFace=pango_ft2_font_get_face(pFont);
    if ( c > 0xf0000 ) {
        res=CLAMP(c,0xf0000,0x1fffff)-0xf0000;
    } else {
        res=FT_Get_Char_Index(theFace, c);
    }
    return res;
#endif
}


#ifdef USE_PANGO_WIN32
static inline NR::Point pointfx_to_nrpoint(const POINTFX &p, double scale)
{
    return NR::Point(*(long*)&p.x / 65536.0 * scale,
                     *(long*)&p.y / 65536.0 * scale);
}
#endif

void font_instance::LoadGlyph(int glyph_id)
{
    if ( pFont == NULL ) return;
    InitTheFace();
#ifndef USE_PANGO_WIN32
    if ( !FT_IS_SCALABLE(theFace) ) return; // bitmap font
#endif

    if ( id_to_no.find(glyph_id) == id_to_no.end() ) {
        if ( nbGlyph >= maxGlyph ) {
            maxGlyph=2*nbGlyph+1;
            glyphs=(font_glyph*)realloc(glyphs,maxGlyph*sizeof(font_glyph));
        }
        font_glyph  n_g;
        n_g.outline=NULL;
        n_g.artbpath=NULL;
        n_g.bbox[0]=n_g.bbox[1]=n_g.bbox[2]=n_g.bbox[3]=0;
        bool   doAdd=false;

#ifdef USE_PANGO_WIN32

#ifndef GGO_UNHINTED         // For compatibility with old SDKs.
#define GGO_UNHINTED 0x0100
#endif

        MAT2 identity = {{0,1},{0,0},{0,0},{0,1}};
        OUTLINETEXTMETRIC otm;
        GetOutlineTextMetrics(daddy->hScreenDC, sizeof(otm), &otm);
        GLYPHMETRICS metrics;
        DWORD bufferSize=GetGlyphOutline (daddy->hScreenDC, glyph_id, GGO_GLYPH_INDEX | GGO_NATIVE | GGO_UNHINTED, &metrics, 0, NULL, &identity);
        double scale=1.0/daddy->fontSize;
        n_g.h_advance=metrics.gmCellIncX*scale;
        n_g.v_advance=otm.otmTextMetrics.tmHeight*scale;
        n_g.h_width=metrics.gmBlackBoxX*scale;
        n_g.v_width=metrics.gmBlackBoxY*scale;
        n_g.outline=NULL;
        if ( bufferSize == GDI_ERROR) {
            // shit happened
        } else if ( bufferSize == 0) {
            // character has no visual representation, but is valid (eg whitespace)
            doAdd=true;
        } else {
            std::auto_ptr<char> buffer(new char[bufferSize]);
            if ( GetGlyphOutline (daddy->hScreenDC, glyph_id, GGO_GLYPH_INDEX | GGO_NATIVE | GGO_UNHINTED, &metrics, bufferSize, buffer.get(), &identity) <= 0 ) {
                // shit happened
            } else {
                // Platform SDK is rubbish, read KB87115 instead
                n_g.outline=new Path;
                DWORD polyOffset=0;
                while ( polyOffset < bufferSize ) {
                    TTPOLYGONHEADER const *polyHeader=(TTPOLYGONHEADER const *)(buffer.get()+polyOffset);
                    if (polyOffset+polyHeader->cb > bufferSize) break;

                    if (polyHeader->dwType == TT_POLYGON_TYPE) {
                        n_g.outline->MoveTo(pointfx_to_nrpoint(polyHeader->pfxStart, scale));
                        DWORD curveOffset=polyOffset+sizeof(TTPOLYGONHEADER);

                        while ( curveOffset < polyOffset+polyHeader->cb ) {
                            TTPOLYCURVE const *polyCurve=(TTPOLYCURVE const *)(buffer.get()+curveOffset);
                            POINTFX const *p=polyCurve->apfx;
                            POINTFX const *endp=p+polyCurve->cpfx;

                            switch (polyCurve->wType) {
                                case TT_PRIM_LINE:
                                    while ( p != endp )
                                        n_g.outline->LineTo(pointfx_to_nrpoint(*p++, scale));
                                    break;

                                case TT_PRIM_QSPLINE:
                                {
                                    g_assert(polyCurve->cpfx >= 2);
                                    endp -= 2;
                                    NR::Point this_mid=pointfx_to_nrpoint(p[0], scale);
                                    while ( p != endp ) {
                                        NR::Point next_mid=pointfx_to_nrpoint(p[1], scale);
                                        n_g.outline->BezierTo((next_mid+this_mid)/2);
                                        n_g.outline->IntermBezierTo(this_mid);
                                        n_g.outline->EndBezierTo();
                                        ++p;
                                        this_mid=next_mid;
                                    }
                                    n_g.outline->BezierTo(pointfx_to_nrpoint(p[1], scale));
                                    n_g.outline->IntermBezierTo(this_mid);
                                    n_g.outline->EndBezierTo();
                                    break;
                                }

                                case 3:  // TT_PRIM_CSPLINE
                                    g_assert(polyCurve->cpfx % 3 == 0);
                                    while ( p != endp ) {
                                        n_g.outline->CubicTo(pointfx_to_nrpoint(p[2], scale), pointfx_to_nrpoint(p[0], scale), pointfx_to_nrpoint(p[1], scale));
                                        p += 3;
                                    }
                                    break;
                            }
                            curveOffset += sizeof(TTPOLYCURVE)+sizeof(POINTFX)*(polyCurve->cpfx-1);
                        }
                        n_g.outline->Close();
                    }
                    polyOffset += polyHeader->cb;
                }
                doAdd=true;
            }
        }
#else
        if (FT_Load_Glyph (theFace, glyph_id, FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP)) {
            // shit happened
        } else {
            if ( FT_HAS_HORIZONTAL(theFace) ) {
                n_g.h_advance=((double)theFace->glyph->metrics.horiAdvance)/((double)theFace->units_per_EM);
                n_g.h_width=((double)theFace->glyph->metrics.width)/((double)theFace->units_per_EM);
            } else {
                n_g.h_width=n_g.h_advance=((double)(theFace->bbox.xMax-theFace->bbox.xMin))/((double)theFace->units_per_EM);
            }
            if ( FT_HAS_VERTICAL(theFace) ) {
                n_g.v_advance=((double)theFace->glyph->metrics.vertAdvance)/((double)theFace->units_per_EM);
                n_g.v_width=((double)theFace->glyph->metrics.height)/((double)theFace->units_per_EM);
            } else {
                n_g.v_width=n_g.v_advance=((double)theFace->height)/((double)theFace->units_per_EM);
            }
            if ( theFace->glyph->format == ft_glyph_format_outline ) {
                FT_Outline_Funcs ft2_outline_funcs = {
                    ft2_move_to,
                    ft2_line_to,
                    ft2_conic_to,
                    ft2_cubic_to,
                    0, 0
                };
                n_g.outline=new Path;
                ft2_to_liv   tData;
                tData.theP=n_g.outline;
                tData.scale=1.0/((double)theFace->units_per_EM);
                tData.last=NR::Point(0,0);
                FT_Outline_Decompose (&theFace->glyph->outline, &ft2_outline_funcs, &tData);
            }
            doAdd=true;
        }
#endif

        if ( doAdd ) {
            if ( n_g.outline ) {
                n_g.outline->FastBBox(n_g.bbox[0],n_g.bbox[1],n_g.bbox[2],n_g.bbox[3]);
                n_g.artbpath=n_g.outline->MakeArtBPath();
            }
            glyphs[nbGlyph]=n_g;
            id_to_no[glyph_id]=nbGlyph;
            nbGlyph++;
        }
    } else {
    }
}

bool font_instance::FontMetrics(double &ascent,double &descent,double &leading)
{
    if ( pFont == NULL ) return false;
    InitTheFace();
    if ( theFace == NULL ) return false;
#ifdef USE_PANGO_WIN32
    OUTLINETEXTMETRIC otm;
    if ( !GetOutlineTextMetrics(daddy->hScreenDC,sizeof(otm),&otm) ) return false;
    double scale=1.0/daddy->fontSize;
    ascent=fabs(otm.otmAscent*scale);
    descent=fabs(otm.otmDescent*scale);
    leading=fabs(otm.otmLineGap*scale);
#else
    if ( theFace->units_per_EM == 0 ) return false; // bitmap font
    ascent=fabs(((double)theFace->ascender)/((double)theFace->units_per_EM));
    descent=fabs(((double)theFace->descender)/((double)theFace->units_per_EM));
    leading=fabs(((double)theFace->height)/((double)theFace->units_per_EM));
    leading-=ascent+descent;
#endif
    return true;
}

bool font_instance::FontSlope(double &run, double &rise)
{
    run = 0.0;
    rise = 1.0;

    if ( pFont == NULL ) return false;
    InitTheFace();
    if ( theFace == NULL ) return false;

#ifdef USE_PANGO_WIN32
    OUTLINETEXTMETRIC otm;
    if ( !GetOutlineTextMetrics(daddy->hScreenDC,sizeof(otm),&otm) ) return false;
    run=otm.otmsCharSlopeRun;
    rise=otm.otmsCharSlopeRise;
#else
    if ( !FT_IS_SCALABLE(theFace) ) return false; // bitmap font

    TT_HoriHeader *hhea = (TT_HoriHeader*)FT_Get_Sfnt_Table(theFace, ft_sfnt_hhea);
    if (hhea == NULL) return false;
    run = hhea->caret_Slope_Run;
    rise = hhea->caret_Slope_Rise;
#endif
    return true;
}

NR::Rect font_instance::BBox(int glyph_id)
{
    int no=-1;
    if ( id_to_no.find(glyph_id) == id_to_no.end() ) {
        LoadGlyph(glyph_id);
        if ( id_to_no.find(glyph_id) == id_to_no.end() ) {
            // didn't load
        } else {
            no=id_to_no[glyph_id];
        }
    } else {
        no=id_to_no[glyph_id];
    }
    if ( no < 0 ) return NR::Rect(NR::Point(0,0),NR::Point(0,0));
    NR::Point rmin(glyphs[no].bbox[0],glyphs[no].bbox[1]);
    NR::Point rmax(glyphs[no].bbox[2],glyphs[no].bbox[3]);
    NR::Rect  res(rmin,rmax);
    return res;
}

Path* font_instance::Outline(int glyph_id,Path* copyInto)
{
    int no=-1;
    if ( id_to_no.find(glyph_id) == id_to_no.end() ) {
        LoadGlyph(glyph_id);
        if ( id_to_no.find(glyph_id) == id_to_no.end() ) {
            // didn't load
        } else {
            no=id_to_no[glyph_id];
        }
    } else {
        no=id_to_no[glyph_id];
    }
    if ( no < 0 ) return NULL;
    Path*    src_o=glyphs[no].outline;
    if ( copyInto ) {
        copyInto->Reset();
        copyInto->Copy(src_o);
        return copyInto;
    }
    return src_o;
}

void* font_instance::ArtBPath(int glyph_id)
{
    int no=-1;
    if ( id_to_no.find(glyph_id) == id_to_no.end() ) {
        LoadGlyph(glyph_id);
        if ( id_to_no.find(glyph_id) == id_to_no.end() ) {
            // didn't load
        } else {
            no=id_to_no[glyph_id];
        }
    } else {
        no=id_to_no[glyph_id];
    }
    if ( no < 0 ) return NULL;
    return glyphs[no].artbpath;
}

double font_instance::Advance(int glyph_id,bool vertical)
{
    int no=-1;
    if ( id_to_no.find(glyph_id) == id_to_no.end() ) {
        LoadGlyph(glyph_id);
        if ( id_to_no.find(glyph_id) == id_to_no.end() ) {
            // didn't load
        } else {
            no=id_to_no[glyph_id];
        }
    } else {
        no=id_to_no[glyph_id];
    }
    if ( no >= 0 ) {
        if ( vertical ) {
            return glyphs[no].v_advance;
        } else {
            return glyphs[no].h_advance;
        }
    }
    return 0;
}


raster_font* font_instance::RasterFont(const NR::Matrix &trs,double stroke_width,bool vertical,JoinType stroke_join,ButtType stroke_cap,float miter_limit)
{
    font_style  nStyle;
    nStyle.transform=trs;
    nStyle.vertical=vertical;
    nStyle.stroke_width=stroke_width;
    nStyle.stroke_cap=stroke_cap;
    nStyle.stroke_join=stroke_join;
    nStyle.nbDash=0;
    nStyle.dash_offset=0;
    nStyle.dashes=NULL;
    return RasterFont(nStyle);
}

raster_font* font_instance::RasterFont(const font_style &inStyle)
{
    raster_font  *res=NULL;
    double *savDashes=NULL;
    font_style nStyle=inStyle;
    // for some evil reason font_style doesn't have a copy ctor, so the
    // stuff that should be done there is done here instead (because the
    // raster_font ctor copies nStyle).
    if ( nStyle.stroke_width > 0 && nStyle.nbDash > 0 && nStyle.dashes ) {
        savDashes=nStyle.dashes;
        nStyle.dashes=(double*)malloc(nStyle.nbDash*sizeof(double));
        memcpy(nStyle.dashes,savDashes,nStyle.nbDash*sizeof(double));
    }
    if ( loadedStyles.find(nStyle) == loadedStyles.end() ) {
                raster_font *nR = new raster_font(nStyle);
        nR->Ref();
        nR->daddy=this;
        loadedStyles[nStyle]=nR;
        res=nR;
        if ( res ) Ref();
    } else {
        res=loadedStyles[nStyle];
        res->Ref();
        if ( nStyle.dashes ) free(nStyle.dashes); // since they're not taken by a new rasterfont
    }
    nStyle.dashes=savDashes;
    return res;
}

void font_instance::RemoveRasterFont(raster_font* who)
{
    if ( who == NULL ) return;
    if ( loadedStyles.find(who->style) == loadedStyles.end() ) {
        //g_print("RemoveRasterFont failed \n");
        // not found
    } else {
        loadedStyles.erase(loadedStyles.find(who->style));
        //g_print("RemoveRasterFont\n");
        Unref();
    }
}


/*
 Local Variables:
 mode:c++
 c-file-style:"stroustrup"
 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 indent-tabs-mode:nil
 fill-column:99
 End:
 */
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :