151 lines
3.7 KiB
C++
151 lines
3.7 KiB
C++
/*
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* %W% %E%
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*
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* (C) Copyright IBM Corp. 1998 - 2003 - All Rights Reserved
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*
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*/
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#ifndef __SCRIPTCOMPOSITEFONTINSTANCE_H
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#define __SCRIPTCOMPOSITEFONTINSTANCE_H
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#include "layout/LETypes.h"
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#include "layout/LEFontInstance.h"
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#include "FontMap.h"
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// U_NAMESPACE_BEGIN
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class ScriptCompositeFontInstance : public LEFontInstance
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{
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public:
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ScriptCompositeFontInstance(FontMap *fontMap);
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virtual ~ScriptCompositeFontInstance();
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/**
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* This method is provided so that clients can tell if
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* a given LEFontInstance is an instance of a composite
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* font.
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*
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* @return <code>true</code> if the instance represents a composite font, <code>false</code> otherwise.
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*
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* @draft ICU 2.6
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*/
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virtual le_bool isComposite() const;
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/**
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* Get a sub-font for a run of text from a composite font. This method examines the
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* given text, finding a run of text which can all be rendered
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* using the same sub-font. Subclassers should try to keep all the text in a single
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* sub-font if they can.
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*
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* @param chars - the array of unicode characters
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* @param offset - a pointer to the starting offset in the text. This will be
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* set to the limit offset of the run on exit.
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* @param count - the number of characters in the array. Can be used as a hint for selecting a sub-font.
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* @param script - the script of the characters.
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*
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* @return an <code>LEFontInstance</code> for the sub font which can render the characters.
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*
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* @draft ICU 2.6
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*/
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const LEFontInstance *getSubFont(const LEUnicode chars[], le_int32 *offset, le_int32 count, le_int32 script) const;
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/**
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* This method maps a single character to a glyph index, using the
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* font's charcter to glyph map.
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*
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* @param ch - the character
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*
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* @return the glyph index
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*
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* @draft ICU 2.6
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*/
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virtual LEGlyphID mapCharToGlyph(LEUnicode32 ch) const;
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virtual const void *getFontTable(LETag tableTag) const;
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virtual le_int32 getUnitsPerEM() const;
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virtual le_int32 getAscent() const;
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virtual le_int32 getDescent() const;
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virtual le_int32 getLeading() const;
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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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float getYPixelsPerEm() const;
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float getScaleFactorX() const;
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float getScaleFactorY() const;
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protected:
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FontMap *fFontMap;
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};
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inline le_bool ScriptCompositeFontInstance::isComposite() const
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{
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return true;
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}
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inline const void *ScriptCompositeFontInstance::getFontTable(LETag tableTag) const
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{
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return NULL;
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}
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// Can't get units per EM without knowing which sub-font, so
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// return a value that will make units == points
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inline le_int32 ScriptCompositeFontInstance::getUnitsPerEM() const
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{
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return 1;
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}
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inline le_int32 ScriptCompositeFontInstance::getAscent() const
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{
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return fFontMap->getAscent();
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}
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inline le_int32 ScriptCompositeFontInstance::getDescent() const
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{
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return fFontMap->getDescent();
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}
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inline le_int32 ScriptCompositeFontInstance::getLeading() const
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{
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return fFontMap->getLeading();
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}
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inline float ScriptCompositeFontInstance::getXPixelsPerEm() const
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{
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return fFontMap->getPointSize();
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}
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inline float ScriptCompositeFontInstance::getYPixelsPerEm() const
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{
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return fFontMap->getPointSize();
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}
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// Can't get a scale factor without knowing the sub-font, so
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// return 1.0.
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inline float ScriptCompositeFontInstance::getScaleFactorX() const
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{
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return 1.0;
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}
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// Can't get a scale factor without knowing the sub-font, so
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// return 1.0
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inline float ScriptCompositeFontInstance::getScaleFactorY() const
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{
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return 1.0;
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}
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// U_NAMESPACE_END
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#endif
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