168 lines
4.0 KiB
C++
168 lines
4.0 KiB
C++
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/*
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*******************************************************************************
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*
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* Copyright (C) 1999-2001, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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* file name: PortableFontInstance.h
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*
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* created on: 11/12/1999
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* created by: Eric R. Mader
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*/
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#ifndef __PORTABLEFONTINSTANCE_H
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#define __PORTABLEFONTINSTANCE_H
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#include <stdio.h>
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#include "LETypes.h"
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#include "LEFontInstance.h"
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#include "sfnt.h"
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#include "cmaps.h"
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#define TABLE_CACHE_INIT 5
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#define TABLE_CACHE_GROW 5
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struct TableCacheEntry
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{
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LETag tag;
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void *table;
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};
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enum PFIErrorCode {
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PFI_NO_ERROR = 0,
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PFI_FONT_FILE_NOT_FOUND_ERROR = 1,
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PFI_MISSING_FONT_TABLE_ERROR = 2,
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PFI_OUT_OF_MEMORY_ERROR = 3
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};
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#ifndef XP_CPLUSPLUS
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typedef enum PFIErrorCode PFIErrorCode;
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#endif
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class PortableFontInstance : public LEFontInstance
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{
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private:
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FILE *fFile;
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float fUnitsPerEM;
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float fPointSize;
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const SFNTDirectory *fDirectory;
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le_uint16 fDirPower;
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le_uint16 fDirExtra;
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TableCacheEntry *fTableCache;
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le_int32 fTableCacheCurr;
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le_int32 fTableCacheSize;
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CMAPMapper *fCMAPMapper;
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const HMTXTable *fHMTXTable;
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le_uint16 fNumGlyphs;
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le_uint16 fNumLongHorMetrics;
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static le_int8 highBit(le_int32 value);
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PFIErrorCode PortableFontInstance::initFontTableCache();
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void PortableFontInstance::flushFontTableCache();
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const DirectoryEntry *findTable(LETag tag) const;
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const void *readTable(LETag tag, le_uint32 *length) const;
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void deleteTable(const void *table) const;
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CMAPMapper *PortableFontInstance::findUnicodeMapper();
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public:
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PortableFontInstance(char *fileName, float pointSize, PFIErrorCode &status);
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virtual ~PortableFontInstance();
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virtual const void *getFontTable(LETag tableTag) const;
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virtual le_bool canDisplay(LEUnicode32 ch) const
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{
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return (le_bool) fCMAPMapper->unicodeToGlyph(ch) != 0;
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};
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virtual le_int32 getUnitsPerEM() const
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{
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return (le_int32) fUnitsPerEM;
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};
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virtual le_int32 getLineHeight() const
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{
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// this is a cheap hack!!
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return (le_int32) fPointSize;
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};
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virtual void mapCharsToGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, const LECharMapper *mapper, LEGlyphID glyphs[]) const;
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virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper) const;
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virtual le_int32 getName(le_uint16 platformID, le_uint16 scriptID, le_uint16 languageID, le_uint16 nameID, LEUnicode *name) const
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{
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// This is only used for CDAC fonts, and we'll have to loose that support anyhow...
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//return (le_int32) fFontObject->getName(platformID, scriptID, languageID, nameID, name);
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if (name != NULL) {
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*name = 0;
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}
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return 0;
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};
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virtual void getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const;
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virtual le_bool getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const;
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float getXPixelsPerEm() const
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{
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return fPointSize;
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};
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float getYPixelsPerEm() const
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{
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return fPointSize;
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};
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float xUnitsToPoints(float xUnits) const
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{
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return (xUnits * fPointSize) / fUnitsPerEM;
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};
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float yUnitsToPoints(float yUnits) const
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{
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return (yUnits * fPointSize) / fUnitsPerEM;
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};
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void unitsToPoints(LEPoint &units, LEPoint &points) const
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{
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points.fX = xUnitsToPoints(units.fX);
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points.fY = yUnitsToPoints(units.fY);
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}
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float xPixelsToUnits(float xPixels) const
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{
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return (xPixels * fUnitsPerEM) / fPointSize;
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};
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float yPixelsToUnits(float yPixels) const
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{
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return (yPixels * fUnitsPerEM) / fPointSize;
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};
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void pixelsToUnits(LEPoint &pixels, LEPoint &units) const
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{
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units.fX = xPixelsToUnits(pixels.fX);
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units.fY = yPixelsToUnits(pixels.fY);
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};
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void transformFunits(float xFunits, float yFunits, LEPoint &pixels) const;
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};
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#endif
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