#ifdef HAVE_CONFIG_H

# include "config.h"

#endif

#ifndef PANGO_ENABLE_ENGINE

#define PANGO_ENABLE_ENGINE

#endif

#include <ft2build.h>

#include FT_OUTLINE_H

#include FT_BBOX_H

#include FT_TRUETYPE_TAGS_H

#include FT_TRUETYPE_TABLES_H

#include FT_GLYPH_H

#include <pango/pangoft2.h>

#include <2geom/pathvector.h>

#include <2geom/path-sink.h>

#include "libnrtype/font-glyph.h"

#include "libnrtype/font-instance.h"

#include "livarot/Path.h"

#include "util/unordered-containers.h"

struct font_style_hash : public std::unary_function<font_style, size_t> {

size_t operator()(font_style const &x) const;

};

struct font_style_equal : public std::binary_function<font_style, font_style, bool> {

bool operator()(font_style const &a, font_style const &b) const;

};

static const double STROKE_WIDTH_THREASHOLD = 0.01;

size_t font_style_hash::operator()(const font_style &x) const {

int h = 0;

int n = static_cast<int>(floor(100 * x.stroke_width));

h *= 12186;

h += n;

n = (x.vertical) ? 1:0;

h *= 12186;

h += n;

if ( x.stroke_width >= STROKE_WIDTH_THREASHOLD ) {

n = x.stroke_cap * 10 + x.stroke_join + static_cast<int>(x.stroke_miter_limit * 100);

h *= 12186;

h += n;

if ( x.nbDash > 0 ) {

n = x.nbDash;

h *= 12186;

h += n;

n = static_cast<int>(floor(100 * x.dash_offset));

h *= 12186;

h += n;

for (int i = 0; i < x.nbDash; i++) {

n = static_cast<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) const {

bool same = true;

for (int i = 0; (i < 6) && same; i++) {

same = ( static_cast<int>(100 * a.transform[i]) == static_cast<int>(100 * b.transform[i]) );

}

same &= ( a.vertical == b.vertical )

&& ( a.stroke_width > STROKE_WIDTH_THREASHOLD ) == ( b.stroke_width > STROKE_WIDTH_THREASHOLD );

if ( same && ( a.stroke_width > STROKE_WIDTH_THREASHOLD ) ) {

same = ( a.stroke_cap == b.stroke_cap )

&& ( a.stroke_join == b.stroke_join )

&& ( static_cast<int>(a.stroke_miter_limit * 100) == static_cast<int>(b.stroke_miter_limit * 100) )

&& ( a.nbDash == b.nbDash );

if ( same && ( a.nbDash > 0 ) ) {

same = ( static_cast<int>(floor(100 * a.dash_offset)) == static_cast<int>(floor(100 * b.dash_offset)) );

for (int i = 0; (i < a.nbDash) && same; i++) {

same = ( static_cast<int>(floor(100 * a.dashes[i])) == static_cast<int>(floor(100 * b.dashes[i])) );

}

}

}

return same;

}

#ifndef USE_PANGO_WIN32

struct FT2GeomData {

FT2GeomData(Geom::PathBuilder &b, double s)

: builder(b)

, last(0, 0)

, scale(s)

{}

Geom::PathBuilder &builder;

Geom::Point last;

double scale;

};

#if FREETYPE_MAJOR == 2 && FREETYPE_MINOR >= 2

typedef FT_Vector const FREETYPE_VECTOR;

#else

typedef FT_Vector FREETYPE_VECTOR;

#endif

static int ft2_move_to(FREETYPE_VECTOR *to, void * i_user)

{

FT2GeomData *user = (FT2GeomData*)i_user;

Geom::Point p(to->x, to->y);

// printf("m t=%f %f\n",p[0],p[1]);

user->builder.moveTo(p * user->scale);

user->last = p;

return 0;

}

static int ft2_line_to(FREETYPE_VECTOR *to, void *i_user)

{

FT2GeomData *user = (FT2GeomData*)i_user;

Geom::Point p(to->x, to->y);

// printf("l t=%f %f\n",p[0],p[1]);

user->builder.lineTo(p * user->scale);

user->last = p;

return 0;

}

static int ft2_conic_to(FREETYPE_VECTOR *control, FREETYPE_VECTOR *to, void *i_user)

{

FT2GeomData *user = (FT2GeomData*)i_user;

Geom::Point p(to->x, to->y), c(control->x, control->y);

user->builder.quadTo(c * user->scale, p * user->scale);

// printf("b c=%f %f t=%f %f\n",c[0],c[1],p[0],p[1]);

user->last = p;

return 0;

}

static int ft2_cubic_to(FREETYPE_VECTOR *control1, FREETYPE_VECTOR *control2, FREETYPE_VECTOR *to, void *i_user)

{

FT2GeomData *user = (FT2GeomData*)i_user;

Geom::Point p(to->x, to->y);

Geom::Point c1(control1->x, control1->y);

Geom::Point c2(control2->x, 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->builder.curveTo(c1 * user->scale, c2 * user->scale, p * user->scale);

user->last = p;

return 0;

}

#endif

font_instance::font_instance(void) :

pFont(0),

descr(0),

refCount(0),

parent(0),

nbGlyph(0),

maxGlyph(0),

glyphs(0),

theFace(0)

{

//printf("font instance born\n");

_ascent = _ascent_max = 0.8;

_descent = _descent_max = 0.2;

_xheight = 0.5;

// Default baseline values, alphabetic is reference

_baselines[ SP_CSS_BASELINE_AUTO ] = 0.0;

_baselines[ SP_CSS_BASELINE_ALPHABETIC ] = 0.0;

_baselines[ SP_CSS_BASELINE_IDEOGRAPHIC ] = -_descent;

_baselines[ SP_CSS_BASELINE_HANGING ] = 0.8 * _ascent;

_baselines[ SP_CSS_BASELINE_MATHEMATICAL ] = 0.8 * _xheight;

_baselines[ SP_CSS_BASELINE_CENTRAL ] = 0.5 - _descent;

_baselines[ SP_CSS_BASELINE_MIDDLE ] = 0.5 * _xheight;

_baselines[ SP_CSS_BASELINE_TEXT_BEFORE_EDGE ] = _ascent;

_baselines[ SP_CSS_BASELINE_TEXT_AFTER_EDGE ] = -_descent;

}

font_instance::~font_instance(void)

{

if ( parent ) {

parent->UnrefFace(this);

parent = 0;

}

//printf("font instance death\n");

if ( pFont ) {

FreeTheFace();

g_object_unref(pFont);

pFont = 0;

}

if ( descr ) {

pango_font_description_free(descr);

descr = 0;

}

// if ( theFace ) FT_Done_Face(theFace); // owned by pFont. don't touch

theFace = 0;

for (int i=0;i<nbGlyph;i++) {

if ( glyphs[i].pathvector ) {

delete glyphs[i].pathvector;

}

}

if ( glyphs ) {

free(glyphs);

glyphs = 0;

}

nbGlyph = 0;

maxGlyph = 0;

}

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 ) {

delete this;

}

}

void font_instance::InitTheFace()

{

if (theFace == NULL && pFont != NULL) {

#ifdef USE_PANGO_WIN32

if ( !theFace ) {

LOGFONT *lf=pango_win32_font_logfont(pFont);

g_assert(lf != NULL);

theFace=pango_win32_font_cache_load(parent->pangoFontCache,lf);

g_free(lf);

}

XFORM identity = {1.0, 0.0, 0.0, 1.0, 0.0, 0.0};

SetWorldTransform(parent->hScreenDC, &identity);

SetGraphicsMode(parent->hScreenDC, GM_COMPATIBLE);

SelectObject(parent->hScreenDC,theFace);

#else

theFace=pango_fc_font_lock_face(PANGO_FC_FONT(pFont));

if ( theFace ) {

FT_Select_Charmap(theFace,ft_encoding_unicode) && FT_Select_Charmap(theFace,ft_encoding_symbol);

}

#endif

FindFontMetrics();

}

}

void font_instance::FreeTheFace()

{

#ifdef USE_PANGO_WIN32

SelectObject(parent->hScreenDC,GetStockObject(SYSTEM_FONT));

pango_win32_font_cache_unload(parent->pangoFontCache,theFace);

#else

pango_fc_font_unlock_face(PANGO_FC_FONT(pFont));

#endif

theFace=NULL;

}

void font_instance::InstallFace(PangoFont* iFace)

{

if ( !iFace ) {

return;

}

pFont=iFace;

iFace = NULL;

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(parent->hScreenDC,&tm) && tm.tmPitchAndFamily&(TMPF_TRUETYPE|TMPF_DEVICE);

#else

return FT_IS_SCALABLE(theFace);

#endif

}

int font_instance::MapUnicodeChar(gunichar c)

{

int res = 0;

if ( pFont ) {

#ifdef USE_PANGO_WIN32

res = pango_win32_font_get_glyph_index(pFont, c);

#else

theFace = pango_fc_font_lock_face(PANGO_FC_FONT(pFont));

if ( c > 0xf0000 ) {

res = CLAMP(c, 0xf0000, 0x1fffff) - 0xf0000;

} else {

res = FT_Get_Char_Index(theFace, c);

}

pango_fc_font_unlock_face(PANGO_FC_FONT(pFont));

#endif

}

return res;

}

#ifdef USE_PANGO_WIN32

static inline Geom::Point pointfx_to_nrpoint(const POINTFX &p, double scale)

{

return Geom::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() ) {

Geom::PathBuilder path_builder;

if ( nbGlyph >= maxGlyph ) {

maxGlyph=2*nbGlyph+1;

glyphs=(font_glyph*)realloc(glyphs,maxGlyph*sizeof(font_glyph));

}

font_glyph n_g;

n_g.pathvector=NULL;

n_g.bbox[0]=n_g.bbox[1]=n_g.bbox[2]=n_g.bbox[3]=0;

n_g.h_advance = 0;

n_g.v_advance = 0;

n_g.h_width = 0;

n_g.v_width = 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(parent->hScreenDC, sizeof(otm), &otm);

GLYPHMETRICS metrics;

DWORD bufferSize=GetGlyphOutline (parent->hScreenDC, glyph_id, GGO_GLYPH_INDEX | GGO_NATIVE | GGO_UNHINTED, &metrics, 0, NULL, &identity);

double scale=1.0/parent->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;

if ( bufferSize == GDI_ERROR) {

// shit happened

} else if ( bufferSize == 0) {

// character has no visual representation, but is valid (eg whitespace)

doAdd=true;

} else {

char *buffer = new char[bufferSize];

if ( GetGlyphOutline (parent->hScreenDC, glyph_id, GGO_GLYPH_INDEX | GGO_NATIVE | GGO_UNHINTED, &metrics, bufferSize, buffer, &identity) <= 0 ) {

// shit happened

} else {

// Platform SDK is rubbish, read KB87115 instead

DWORD polyOffset=0;

while ( polyOffset < bufferSize ) {

TTPOLYGONHEADER const *polyHeader=(TTPOLYGONHEADER const *)(buffer+polyOffset);

if (polyOffset+polyHeader->cb > bufferSize) break;

if (polyHeader->dwType == TT_POLYGON_TYPE) {

path_builder.moveTo(pointfx_to_nrpoint(polyHeader->pfxStart, scale));

DWORD curveOffset=polyOffset+sizeof(TTPOLYGONHEADER);

while ( curveOffset < polyOffset+polyHeader->cb ) {

TTPOLYCURVE const *polyCurve=(TTPOLYCURVE const *)(buffer+curveOffset);

POINTFX const *p=polyCurve->apfx;

POINTFX const *endp=p+polyCurve->cpfx;

switch (polyCurve->wType) {

case TT_PRIM_LINE:

while ( p != endp )

path_builder.lineTo(pointfx_to_nrpoint(*p++, scale));

break;

case TT_PRIM_QSPLINE:

{

g_assert(polyCurve->cpfx >= 2);

// The list of points specifies one or more control points and ends with the end point.

// The intermediate points (on the curve) are the points between the control points.

Geom::Point this_control = pointfx_to_nrpoint(*p++, scale);

while ( p+1 != endp ) { // Process all "midpoints" (all points except the last)

Geom::Point new_control = pointfx_to_nrpoint(*p++, scale);

path_builder.quadTo(this_control, (new_control+this_control)/2);

this_control = new_control;

}

Geom::Point end = pointfx_to_nrpoint(*p++, scale);

path_builder.quadTo(this_control, end);

}

break;

case 3: // TT_PRIM_CSPLINE

g_assert(polyCurve->cpfx % 3 == 0);

while ( p != endp ) {

path_builder.curveTo(pointfx_to_nrpoint(p[0], scale),

pointfx_to_nrpoint(p[1], scale),

pointfx_to_nrpoint(p[2], scale));

p += 3;

}

break;

}

curveOffset += sizeof(TTPOLYCURVE)+sizeof(POINTFX)*(polyCurve->cpfx-1);

}

}

polyOffset += polyHeader->cb;

}

doAdd=true;

}

delete [] buffer;

}

#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 {

// CSS3 Writing modes dictates that if vertical font metrics are missing we must

// synthisize them. No method is specified. The SVG 1.1 spec suggests using the em

// height (which is not theFace->height as that includes leading). The em height

// is ascender + descender (descender positive). Note: The "Requirements for

// Japanese Text Layout" W3C document says that Japanese kanji should be "set

// solid" which implies that vertical (and horizontal) advance should be 1em.

n_g.v_width=n_g.v_advance= 1.0;

}

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

};

FT2GeomData user(path_builder, 1.0/((double)theFace->units_per_EM));

FT_Outline_Decompose (&theFace->glyph->outline, &ft2_outline_funcs, &user);

}

doAdd=true;

}

#endif

path_builder.flush();

if ( doAdd ) {

Geom::PathVector pv = path_builder.peek();

// close all paths

for (Geom::PathVector::iterator i = pv.begin(); i != pv.end(); ++i) {

i->close();

}

if ( !pv.empty() ) {

n_g.pathvector = new Geom::PathVector(pv);

Geom::OptRect bounds = bounds_exact(*n_g.pathvector);

if (bounds) {

n_g.bbox[0] = bounds->left();

n_g.bbox[1] = bounds->top();

n_g.bbox[2] = bounds->right();

n_g.bbox[3] = bounds->bottom();

}

}

glyphs[nbGlyph]=n_g;

id_to_no[glyph_id]=nbGlyph;

nbGlyph++;

}

} else {

}

}

bool font_instance::FontMetrics(double &ascent,double &descent,double &xheight)

{

if ( pFont == NULL ) {

return false;

}

InitTheFace();

if ( theFace == NULL ) {

return false;

}

ascent = _ascent;

descent = _descent;

xheight = _xheight;

return true;

}

bool font_instance::FontDecoration( double &underline_position, double &underline_thickness,

double &linethrough_position, double &linethrough_thickness)

{

if ( pFont == NULL ) {

return false;

}

InitTheFace();

if ( theFace == NULL ) {

return false;

}

#ifdef USE_PANGO_WIN32

OUTLINETEXTMETRIC otm;

if ( !GetOutlineTextMetrics(parent->hScreenDC,sizeof(otm),&otm) ) {

return false;

}

double scale=1.0/parent->fontSize;

underline_position = fabs(otm.otmUnderscorePosition *scale);

underline_thickness = fabs(otm.otmUnderscoreSize *scale);

linethrough_position = fabs(otm.otmStrikeoutPosition *scale);

linethrough_thickness = fabs(otm.otmStrikeoutSize *scale);

#else

if ( theFace->units_per_EM == 0 ) {

return false; // bitmap font

}

underline_position = fabs(((double)theFace->underline_position )/((double)theFace->units_per_EM));

underline_thickness = fabs(((double)theFace->underline_thickness)/((double)theFace->units_per_EM));

// there is no specific linethrough information, mock it up from other font fields

linethrough_position = fabs(((double)theFace->ascender / 3.0 )/((double)theFace->units_per_EM));

linethrough_thickness = fabs(((double)theFace->underline_thickness)/((double)theFace->units_per_EM));

#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(parent->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;

}

Geom::OptRect 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 Geom::OptRect();

} else {

Geom::Point rmin(glyphs[no].bbox[0],glyphs[no].bbox[1]);

Geom::Point rmax(glyphs[no].bbox[2],glyphs[no].bbox[3]);

return Geom::Rect(rmin, rmax);

}

}

Geom::PathVector* font_instance::PathVector(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].pathvector;

}

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;

}

void font_instance::FindFontMetrics() {

// CSS2 recommends using the OS/2 values sTypoAscender and sTypoDescender for the Typographic

// ascender and descender values:

// http://www.w3.org/TR/CSS2/visudet.html#sTypoAscender

// On Windows, the typographic ascender and descender are taken from the otmMacAscent and

// otmMacDescent values:

// http://microsoft.public.win32.programmer.gdi.narkive.com/LV6k4BDh/msdn-documentation-outlinetextmetrics-clarification

// The otmAscent and otmDescent values are the maxiumum ascent and maxiumum descent of all the

// glyphs in a font.

if ( theFace ) {

#ifdef USE_PANGO_WIN32

if ( GetOutlineTextMetrics(parent->hScreenDC,sizeof(otm),&otm) ) {

double scale=1.0/parent->fontSize;

_ascent = fabs(otm.otmMacAscent * scale);

_descent = fabs(otm.otmMacDescent * scale);

_xheight = fabs(otm.otmXHeight * scale);

_ascent_max = fabs(otm.otmAscent * scale);

_descent_max = fabs(otm.otmDescent * scale);

// In CSS em size is ascent + descent... which should be 1. If not,

// adjust so it is.

double em = _ascent + _descent;

if( em > 0 ) {

_ascent /= em;

_descent /= em;

}

// May not be necessary but if OS/2 table missing or not version 2 or higher,

// xheight might be zero.

if( _xheight == 0.0 ) {

_xheight = 0.5;

}

// Baselines defined relative to alphabetic.

_baselines[ SP_CSS_BASELINE_IDEOGRAPHIC ] = -_descent; // Recommendation

_baselines[ SP_CSS_BASELINE_HANGING ] = 0.8 * _ascent; // Guess

_baselines[ SP_CSS_BASELINE_MATHEMATICAL ] = 0.8 * _xheight; // Guess

_baselines[ SP_CSS_BASELINE_CENTRAL ] = 0.5 - _descent; // Definition

_baselines[ SP_CSS_BASELINE_MIDDLE ] = 0.5 * _xheight; // Definition

_baselines[ SP_CSS_BASELINE_TEXT_BEFORE_EDGE ] = _ascent; // Definition

_baselines[ SP_CSS_BASELINE_TEXT_AFTER_EDGE ] = -_descent; // Definition

MAT2 identity = {{0,1},{0,0},{0,0},{0,1}};

GLYPHMETRICS metrics;

int retval;

// Better math baseline:

// Try center of minus sign

retval = GetGlyphOutline (parent->hScreenDC, 0x2212, GGO_NATIVE | GGO_UNHINTED, &metrics, 0, NULL, &identity);

// If no minus sign, try hyphen

if( retval <= 0 )

retval = GetGlyphOutline (parent->hScreenDC, '-', GGO_NATIVE | GGO_UNHINTED, &metrics, 0, NULL, &identity);

if( retval > 0 ) {

double math = (metrics.gmptGlyphOrigin.y + 0.5 * metrics.gmBlackBoxY) * scale;

_baselines[ SP_CSS_BASELINE_MATHEMATICAL ] = math;

}

// Find hanging baseline... assume it is at top of 'म'.

retval = GetGlyphOutline (parent->hScreenDC, 0x092E, GGO_NATIVE | GGO_UNHINTED, &metrics, 0, NULL, &identity);

if( retval > 0 ) {

double hanging = metrics.gmptGlyphOrigin.y * scale;

_baselines[ SP_CSS_BASELINE_MATHEMATICAL ] = hanging;

}

}

#else

if ( theFace->units_per_EM != 0 ) { // If zero then it's a bitmap font.

TT_OS2* os2 = (TT_OS2*)FT_Get_Sfnt_Table( theFace, FT_SFNT_OS2 );

if( os2 ) {

_ascent = fabs(((double)os2->sTypoAscender) / ((double)theFace->units_per_EM));

_descent = fabs(((double)os2->sTypoDescender)/ ((double)theFace->units_per_EM));

} else {

_ascent = fabs(((double)theFace->ascender) / ((double)theFace->units_per_EM));

_descent = fabs(((double)theFace->descender) / ((double)theFace->units_per_EM));

}

_ascent_max = fabs(((double)theFace->ascender) / ((double)theFace->units_per_EM));

_descent_max = fabs(((double)theFace->descender) / ((double)theFace->units_per_EM));

// In CSS em size is ascent + descent... which should be 1. If not,

// adjust so it is.

double em = _ascent + _descent;

if( em > 0 ) {

_ascent /= em;

_descent /= em;

}

// x-height

if( os2 && os2->version >= 0x0002 && os2->version != 0xffffu ) {

// Only os/2 version 2 and above have sxHeight, 0xffff marks "old Mac fonts" without table

_xheight = fabs(((double)os2->sxHeight) / ((double)theFace->units_per_EM));

} else {

// Measure 'x' height in font. Recommended option by XSL standard if no sxHeight.

FT_UInt index = FT_Get_Char_Index( theFace, 'x' );

if( index != 0 ) {

FT_Load_Glyph( theFace, index, FT_LOAD_NO_SCALE );

_xheight = (fabs)(((double)theFace->glyph->metrics.height/(double)theFace->units_per_EM));

} else {

// No 'x' in font!

_xheight = 0.5;

}

}

// Baselines defined relative to alphabetic.

_baselines[ SP_CSS_BASELINE_IDEOGRAPHIC ] = -_descent; // Recommendation

_baselines[ SP_CSS_BASELINE_HANGING ] = 0.8 * _ascent; // Guess

_baselines[ SP_CSS_BASELINE_MATHEMATICAL ] = 0.8 * _xheight; // Guess

_baselines[ SP_CSS_BASELINE_CENTRAL ] = 0.5 - _descent; // Definition

_baselines[ SP_CSS_BASELINE_MIDDLE ] = 0.5 * _xheight; // Definition

_baselines[ SP_CSS_BASELINE_TEXT_BEFORE_EDGE ] = _ascent; // Definition

_baselines[ SP_CSS_BASELINE_TEXT_AFTER_EDGE ] = -_descent; // Definition

// Better math baseline:

// Try center of minus sign

FT_UInt index = FT_Get_Char_Index( theFace, 0x2212 ); //'−'

// If no minus sign, try hyphen

if( index == 0 )

index = FT_Get_Char_Index( theFace, '-' );

if( index != 0 ) {

FT_Load_Glyph( theFace, index, FT_LOAD_NO_SCALE );

FT_Glyph aglyph;

FT_Get_Glyph( theFace->glyph, &aglyph );

FT_BBox acbox;

FT_Glyph_Get_CBox( aglyph, FT_GLYPH_BBOX_UNSCALED, &acbox );

double math = (acbox.yMin + acbox.yMax)/2.0/(double)theFace->units_per_EM;

_baselines[ SP_CSS_BASELINE_MATHEMATICAL ] = math;

// std::cout << "Math baseline: - bbox: y_min: " << acbox.yMin

// << " y_max: " << acbox.yMax

// << " math: " << math << std::endl;

}

// Find hanging baseline... assume it is at top of 'म'.

index = FT_Get_Char_Index( theFace, 0x092E ); // 'म'

if( index != 0 ) {

FT_Load_Glyph( theFace, index, FT_LOAD_NO_SCALE );

FT_Glyph aglyph;

FT_Get_Glyph( theFace->glyph, &aglyph );

FT_BBox acbox;

FT_Glyph_Get_CBox( aglyph, FT_GLYPH_BBOX_UNSCALED, &acbox );

double hanging = (double)acbox.yMax/(double)theFace->units_per_EM;

_baselines[ SP_CSS_BASELINE_HANGING ] = hanging;

// std::cout << "Hanging baseline: प: " << hanging << std::endl;

}

}

#endif

// const gchar *family = pango_font_description_get_family(descr);

// std::cout << "Font: " << (family?family:"null") << std::endl;

// std::cout << " ascent: " << _ascent << std::endl;

// std::cout << " descent: " << _descent << std::endl;

// std::cout << " x-height: " << _xheight << std::endl;

// std::cout << " max ascent: " << _ascent_max << std::endl;

// std::cout << " max descent: " << _descent_max << std::endl;

// std::cout << " Baselines:" << std::endl;

// std::cout << " alphabetic: " << _baselines[ SP_CSS_BASELINE_ALPHABETIC ] << std::endl;

// std::cout << " ideographic: " << _baselines[ SP_CSS_BASELINE_IDEOGRAPHIC ] << std::endl;

// std::cout << " hanging: " << _baselines[ SP_CSS_BASELINE_HANGING ] << std::endl;

// std::cout << " math: " << _baselines[ SP_CSS_BASELINE_MATHEMATICAL ] << std::endl;

// std::cout << " central: " << _baselines[ SP_CSS_BASELINE_CENTRAL ] << std::endl;

// std::cout << " middle: " << _baselines[ SP_CSS_BASELINE_MIDDLE ] << std::endl;

// std::cout << " text_before: " << _baselines[ SP_CSS_BASELINE_TEXT_BEFORE_EDGE ] << std::endl;

// std::cout << " text_after: " << _baselines[ SP_CSS_BASELINE_TEXT_AFTER_EDGE ] << std::endl;

}

}