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/*
*******************************************************************************
*
* Copyright (C) 1999-2001, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: RenderingFontInstance.h
*
* created on: 10/23/2001
* created by: Eric R. Mader
*/
#ifndef __RENDERINGFONTINSTANCE_H
#define __RENDERINGFONTINSTANCE_H
#include "LETypes.h"
#include "LEFontInstance.h"
#include "cmaps.h"
#define TABLE_CACHE_INIT 5
#define TABLE_CACHE_GROW 5
struct TableCacheEntry
{
LETag tag;
void *table;
};
enum RFIErrorCode {
RFI_NO_ERROR = 0,
RFI_ILLEGAL_ARGUMENT_ERROR = 1,
RFI_FONT_FILE_NOT_FOUND_ERROR = 2,
RFI_MISSING_FONT_TABLE_ERROR = 3,
RFI_OUT_OF_MEMORY_ERROR = 4
};
class RenderingFontInstance : public LEFontInstance
{
protected:
void *fSurface;
le_int32 fPointSize;
le_int32 fUnitsPerEM;
le_int32 fAscent;
le_int32 fDescent;
le_int32 fLeading;
float fDeviceScaleX;
float fDeviceScaleY;
TableCacheEntry *fTableCache;
le_int32 fTableCacheCurr;
le_int32 fTableCacheSize;
CMAPMapper *fMapper;
virtual RFIErrorCode initMapper();
virtual RFIErrorCode initFontTableCache();
virtual void flushFontTableCache();
virtual const void *readFontTable(LETag tableTag) const = 0;
public:
RenderingFontInstance(void *surface, le_int16 pointSize);
virtual ~RenderingFontInstance();
virtual const void *getFontTable(LETag tableTag) const;
virtual le_bool canDisplay(LEUnicode32 ch) const
{
return fMapper->unicodeToGlyph(ch) != 0;
};
virtual le_int32 getUnitsPerEM() const
{
return fUnitsPerEM;
};
virtual le_int32 getLineHeight() const
{
return getAscent() + getDescent() + getLeading();
};
virtual le_int32 getAscent() const
{
return fAscent;
};
virtual le_int32 getDescent() const
{
return fDescent;
};
virtual le_int32 getLeading() const
{
return fLeading;
};
virtual void mapCharsToGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, const LECharMapper *mapper, LEGlyphID glyphs[]) const;
virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper) const;
virtual le_int32 getName(le_uint16 platformID, le_uint16 scriptID, le_uint16 languageID, le_uint16 nameID, LEUnicode *name) const
{
// This is only used for CDAC fonts, and we'll have to loose that support anyhow...
//return (le_int32) fFontObject->getName(platformID, scriptID, languageID, nameID, name);
if (name != NULL) {
*name = 0;
}
return 0;
};
virtual void getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const = 0;
virtual le_bool getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const = 0;
virtual const void setFont(void *surface) const
{
// default implementation is to ignore this
};
virtual void drawGlyphs(void *surface, LEGlyphID *glyphs, le_uint32 count, le_int32 *dx,
le_int32 x, le_int32 y, le_int32 width, le_int32 height) const = 0;
float getXPixelsPerEm() const
{
return (float) fPointSize;
};
float getYPixelsPerEm() const
{
return (float) fPointSize;
};
float xUnitsToPoints(float xUnits) const
{
return (xUnits * fPointSize) / (float) fUnitsPerEM;
};
float yUnitsToPoints(float yUnits) const
{
return (yUnits * fPointSize) / (float) fUnitsPerEM;
};
void unitsToPoints(LEPoint &units, LEPoint &points) const
{
points.fX = xUnitsToPoints(units.fX);
points.fY = yUnitsToPoints(units.fY);
}
float xPixelsToUnits(float xPixels) const
{
return (xPixels * fUnitsPerEM) / (float) fPointSize;
};
float yPixelsToUnits(float yPixels) const
{
return (yPixels * fUnitsPerEM) / (float) fPointSize;
};
void pixelsToUnits(LEPoint &pixels, LEPoint &units) const
{
units.fX = xPixelsToUnits(pixels.fX);
units.fY = yPixelsToUnits(pixels.fY);
};
void transformFunits(float xFunits, float yFunits, LEPoint &pixels) const
{
pixels.fX = xUnitsToPoints(xFunits) * fDeviceScaleX;
pixels.fY = yUnitsToPoints(yFunits) * fDeviceScaleY;
}
};
#endif
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