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 Part of the XeTeX typesetting system
 copyright (c) 1994-2006 by SIL International
 written by Jonathan Kew

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/*
 *   file name:  XeTeXFontInst_FT2.cpp
 *
 *   created on: 2005-10-25
 *   created by: Jonathan Kew
 */


#include "XeTeXFontInst_FT2.h"

#include FT_TRUETYPE_TABLES_H
#include FT_TYPE1_TABLES_H
#include FT_GLYPH_H

#include <string.h>

FT_Library	gFreeTypeLibrary = 0;

XeTeXFontInst_FT2::XeTeXFontInst_FT2(const char* pathname, int index, float pointSize, LEErrorCode &status)
    : XeTeXFontInst(pointSize, status)
    , face(0)
    , fFreeTypeOnly(false)
{
    if (LE_FAILURE(status)) {
        return;
    }

	FT_Error	err;
	if (!gFreeTypeLibrary) {
		err = FT_Init_FreeType(&gFreeTypeLibrary);
		if (err != 0) {
			fprintf(stderr, "FreeType initialization failed! (%d)\n", err);
			exit(1);
		}
	}

	err = FT_New_Face(gFreeTypeLibrary, (char*)pathname, index, &face);

	if (err != 0) {
        status = LE_FONT_FILE_NOT_FOUND_ERROR;
        return;
    }

	/* for non-sfnt-packaged fonts (presumably Type 1), see if there is an AFM file we can attach */
	if (index == 0 && !FT_IS_SFNT(face)) {
		char*	afm = new char[strlen((const char*)pathname) + 5];	// room to append ".afm"
		strcpy(afm, (const char*)pathname);
		char*	p = strrchr(afm, '.');
		if (p == NULL || strlen(p) != 4 || tolower(*(p+1)) != 'p' || tolower(*(p+2)) != 'f')
			strcat(afm, ".afm");	// append .afm if the extension didn't seem to be .pf[ab]
		else
			strcpy(p, ".afm");		// else replace extension with .afm
		FT_Attach_File(face, afm);	// ignore error code; AFM might not exist
		delete[] afm;
		fFreeTypeOnly = true;
	}

	initialize(status);

	if (LE_FAILURE(status))
		return;
	
	char	buf[20];
	if (index > 0)
		sprintf(buf, ":%d", index);
	else
		buf[0] = 0;
	fFilename = new char[strlen(pathname) + 2 + strlen(buf) + 1];
	sprintf(fFilename, "[%s%s]", pathname, buf);
}

XeTeXFontInst_FT2::~XeTeXFontInst_FT2()
{
	if (face != 0) {
		FT_Done_Face(face);
		face = 0;
	}
}

void XeTeXFontInst_FT2::initialize(LEErrorCode &status)
{
    if (face == 0) {
        status = LE_FONT_FILE_NOT_FOUND_ERROR;
        return;
    }

	XeTeXFontInst::initialize(status);

	if (LE_FAILURE(status)) {
		/* font can ONLY be used via FreeType APIs, not direct table access */
		fFreeTypeOnly = true;
		status = LE_NO_ERROR;
		
		/* fill in fields that XeTeXFontInst::initialize failed to get for us */
		fUnitsPerEM = face->units_per_EM;
		fAscent = yUnitsToPoints(face->ascender);
		fDescent = yUnitsToPoints(face->descender);
//		fLeading = ;
		fItalicAngle = 0;
		PS_FontInfoRec	font_info;
		if (FT_Get_PS_Font_Info(face, &font_info) == 0) {
			// will return error if it wasn't a PS font
			fItalicAngle = font_info.italic_angle;
		}
	}
	
    return;
}

const void *XeTeXFontInst_FT2::readTable(LETag tag, le_uint32 *length) const
{
	*length = 0;
	FT_ULong	tmpLength = 0;
	FT_Error err = FT_Load_Sfnt_Table(face, tag, 0, NULL, &tmpLength);
	if (err != 0)
		return NULL;
	
	void*	table = LE_NEW_ARRAY(char, tmpLength);
	if (table != NULL) {
		err = FT_Load_Sfnt_Table(face, tag, 0, (FT_Byte*)table, &tmpLength);
		if (err != 0) {
			LE_DELETE_ARRAY(table);
			return NULL;
		}
		*length = tmpLength;
	}

    return table;
}

void
XeTeXFontInst_FT2::getGlyphBounds(LEGlyphID gid, GlyphBBox* bbox)
{
	bbox->xMin = bbox->yMin = bbox->xMax = bbox->yMax = 0.0;

	FT_Error	err = FT_Load_Glyph(face, gid, FT_LOAD_NO_SCALE);
	if (err != 0)
		return;
    
    FT_Glyph	glyph;
    err = FT_Get_Glyph(face->glyph, &glyph);
	if (err == 0) {	    
		FT_BBox	ft_bbox;
		FT_Glyph_Get_CBox(glyph, FT_GLYPH_BBOX_UNSCALED, &ft_bbox);
		bbox->xMin = ft_bbox.xMin * fPointSize / fUnitsPerEM;
		bbox->yMin = ft_bbox.yMin * fPointSize / fUnitsPerEM;
		bbox->xMax = ft_bbox.xMax * fPointSize / fUnitsPerEM;
		bbox->yMax = ft_bbox.yMax * fPointSize / fUnitsPerEM;
		FT_Done_Glyph(glyph);
	}
}

LEGlyphID
XeTeXFontInst_FT2::mapCharToGlyph(LEUnicode32 ch) const
{
	if (!fFreeTypeOnly)
		return XeTeXFontInst::mapCharToGlyph(ch);

	return FT_Get_Char_Index(face, ch);
}

le_uint16
XeTeXFontInst_FT2::getNumGlyphs() const
{
	return face->num_glyphs;
}

void
XeTeXFontInst_FT2::getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const
{
	if (!fFreeTypeOnly)
		XeTeXFontInst::getGlyphAdvance(glyph, advance);
	else {
		FT_Error	err = FT_Load_Glyph(face, glyph, FT_LOAD_NO_SCALE);
		if (err != 0) {
			advance.fX = advance.fY = 0;
		}
		else {
			advance.fX = fVertical ? 0 : face->glyph->metrics.horiAdvance * fPointSize / fUnitsPerEM;
			advance.fY = fVertical ? face->glyph->metrics.vertAdvance * fPointSize / fUnitsPerEM : 0;
		}
	}
}

LEGlyphID
XeTeXFontInst_FT2::mapGlyphToIndex(const char* glyphName) const
{
	LEGlyphID	rval = FT_Get_Name_Index(face, const_cast<char*>(glyphName));
	if (rval == 0)
		rval = XeTeXFontInst::mapGlyphToIndex(glyphName);
	return rval;
}

void
XeTeXFontInst_FT2::getKernPair(LEGlyphID leftGlyph, LEGlyphID rightGlyph, LEPoint &kern) const
{
	FT_Vector	kerning;
	if (FT_Get_Kerning(face, leftGlyph, rightGlyph, FT_KERNING_UNSCALED, &kerning) == 0) {
		kern.fX = kerning.x;
		kern.fY = kerning.y;
	}
	else
		kern.fX = kern.fY = 0;
}

const char*
XeTeXFontInst_FT2::getGlyphName(LEGlyphID gid, int& nameLen)
{
	if (!fFreeTypeOnly)
		return XeTeXFontInst::getGlyphName(gid, nameLen);
	else if (FT_HAS_GLYPH_NAMES(face)) {
		static char	buffer[256];
		FT_Get_Glyph_Name(face, gid, buffer, 256);
		nameLen = strlen(buffer);
		return &buffer[0];
	}
	else {
		nameLen = 0;
		return NULL;
	}
}

LEUnicode32
XeTeXFontInst_FT2::getFirstCharCode()
{
	if (!fFreeTypeOnly)
		return XeTeXFontInst::getFirstCharCode();
	else {
		FT_UInt  gindex;
		return FT_Get_First_Char(face, &gindex);
	}
}

LEUnicode32
XeTeXFontInst_FT2::getLastCharCode()
{
	if (!fFreeTypeOnly)
		return XeTeXFontInst::getLastCharCode();
	else {
		FT_UInt  gindex;
		LEUnicode32	ch = FT_Get_First_Char(face, &gindex);
		LEUnicode32	prev = ch;
		while (gindex != 0) {
			prev = ch;
			ch = FT_Get_Next_Char(face, ch, &gindex);
		}
		return prev;
	}
}