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10/28/2024 06:50:30 AM
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LEFontInstance.h
18.6 KB
12/09/2017 04:08:16 PM
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LEGlyphFilter.h
883 bytes
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LEGlyphStorage.h
16.66 KB
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LEInsertionList.h
4.53 KB
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LELanguages.h
2.47 KB
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LEScripts.h
5.11 KB
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LESwaps.h
2.63 KB
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LETypes.h
22.35 KB
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LayoutEngine.h
9.45 KB
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loengine.h
6.33 KB
12/09/2017 04:08:16 PM
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Editing: LayoutEngine.h
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/* * (C) Copyright IBM Corp. and others 1998-2013 - All Rights Reserved * (C) Copyright Google, Inc. 2012-2013 - All Rights Reserved */ #ifndef __LAYOUTENGINE_H #define __LAYOUTENGINE_H #include "LETypes.h" struct hb_font_t; struct hb_buffer_t; U_NAMESPACE_BEGIN class LEFontInstance; class LEGlyphStorage; /** * This is a class used to do complex text layout. The text must all * be in a single font, script, and language. An instance of a LayoutEngine can be * created by calling the layoutEngineFactory method. Fonts are identified by * instances of the LEFontInstance class. Script and language codes are identified * by integer codes, which are defined in ScriptAndLanuageTags.h. * * Note that this class is not public API. It is declared public so that it can be * exported from the library that it is a part of. * * The input to the layout process is an array of characters in logical order, * and a starting X, Y position for the text. The output is an array of glyph indices, * an array of character indices for the glyphs, and an array of glyph positions. * These arrays are protected members of LayoutEngine which can be retreived by a * public method. The reset method can be called to free these arrays so that the * LayoutEngine can be reused. * * @see LEFontInstance * @see ScriptAndLanguageTags.h * * @stable ICU 2.8 */ class U_LAYOUT_API LayoutEngine : public UObject { public: #ifndef U_HIDE_INTERNAL_API /** @internal Flag to request kerning. */ static const le_int32 kTypoFlagKern; /** @internal Flag to request ligatures. */ static const le_int32 kTypoFlagLiga; #endif /* U_HIDE_INTERNAL_API */ private: hb_font_t *fHbFont; hb_buffer_t *fHbBuffer; LEGlyphStorage *fGlyphStorage; le_int32 fTypoFlags; #ifndef U_HIDE_INTERNAL_API /** * This constructs an instance for a given font, script and language. Subclass constructors * must call this constructor. * * @param fontInstance - the font for the text * @param scriptCode - the script for the text * @param languageCode - the language for the text * @param typoFlags - the typographic control flags for the text (a bitfield). Use kTypoFlagKern * if kerning is desired, kTypoFlagLiga if ligature formation is desired. Others are reserved. * @param success - set to an error code if the operation fails * * @see LEFontInstance * @see ScriptAndLanguageTags.h * * @internal */ LayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags, LEErrorCode &success); #endif /* U_HIDE_INTERNAL_API */ // Do not enclose the protected default constructor with #ifndef U_HIDE_INTERNAL_API // or else the compiler will create a public default constructor. /** * This overrides the default no argument constructor to make it * difficult for clients to call it. Clients are expected to call * layoutEngineFactory. * * @internal */ LayoutEngine(); public: /** * The destructor. It will free any storage allocated for the * glyph, character index and position arrays by calling the reset * method. * * @stable ICU 2.8 */ ~LayoutEngine(); /** * This method will invoke the layout steps in their correct order by calling * the computeGlyphs, positionGlyphs and adjustGlyphPosition methods. It will * compute the glyph, character index and position arrays. * * @param chars - the input character context * @param offset - the offset of the first character to process * @param count - the number of characters to process * @param max - the number of characters in the input context * @param rightToLeft - TRUE if the characers are in a right to left directional run * @param x - the initial X position * @param y - the initial Y position * @param success - output parameter set to an error code if the operation fails * * @return the number of glyphs in the glyph array * * Note: The glyph, character index and position array can be accessed * using the getter methods below. * * Note: If you call this method more than once, you must call the reset() * method first to free the glyph, character index and position arrays * allocated by the previous call. * * @stable ICU 2.8 */ le_int32 layoutChars(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, float x, float y, LEErrorCode &success); /** * This method returns the number of glyphs in the glyph array. Note * that the number of glyphs will be greater than or equal to the number * of characters used to create the LayoutEngine. * * @return the number of glyphs in the glyph array * * @stable ICU 2.8 */ le_int32 getGlyphCount() const; /** * This method copies the glyph array into a caller supplied array. * The caller must ensure that the array is large enough to hold all * the glyphs. * * @param glyphs - the destiniation glyph array * @param success - set to an error code if the operation fails * * @stable ICU 2.8 */ void getGlyphs(LEGlyphID glyphs[], LEErrorCode &success) const; /** * This method copies the glyph array into a caller supplied array, * ORing in extra bits. (This functionality is needed by the JDK, * which uses 32 bits pre glyph idex, with the high 16 bits encoding * the composite font slot number) * * @param glyphs - the destination (32 bit) glyph array * @param extraBits - this value will be ORed with each glyph index * @param success - set to an error code if the operation fails * * @stable ICU 2.8 */ void getGlyphs(le_uint32 glyphs[], le_uint32 extraBits, LEErrorCode &success) const; /** * This method copies the character index array into a caller supplied array. * The caller must ensure that the array is large enough to hold a * character index for each glyph. * * @param charIndices - the destiniation character index array * @param success - set to an error code if the operation fails * * @stable ICU 2.8 */ void getCharIndices(le_int32 charIndices[], LEErrorCode &success) const; /** * This method copies the character index array into a caller supplied array. * The caller must ensure that the array is large enough to hold a * character index for each glyph. * * @param charIndices - the destiniation character index array * @param indexBase - an offset which will be added to each index * @param success - set to an error code if the operation fails * * @stable ICU 2.8 */ void getCharIndices(le_int32 charIndices[], le_int32 indexBase, LEErrorCode &success) const; /** * This method copies the position array into a caller supplied array. * The caller must ensure that the array is large enough to hold an * X and Y position for each glyph, plus an extra X and Y for the * advance of the last glyph. * * @param positions - the destiniation position array * @param success - set to an error code if the operation fails * * @stable ICU 2.8 */ void getGlyphPositions(float positions[], LEErrorCode &success) const; /** * This method returns the X and Y position of the glyph at * the given index. * * Input parameters: * @param glyphIndex - the index of the glyph * * Output parameters: * @param x - the glyph's X position * @param y - the glyph's Y position * @param success - set to an error code if the operation fails * * @stable ICU 2.8 */ void getGlyphPosition(le_int32 glyphIndex, float &x, float &y, LEErrorCode &success) const; /** * This method frees the glyph, character index and position arrays * so that the LayoutEngine can be reused to layout a different * characer array. (This method is also called by the destructor) * * @stable ICU 2.8 */ void reset(); /** * This method returns a LayoutEngine capable of laying out text * in the given font, script and langauge. Note that the LayoutEngine * returned may be a subclass of LayoutEngine. * * @param fontInstance - the font of the text * @param scriptCode - the script of the text * @param languageCode - the language of the text * @param success - output parameter set to an error code if the operation fails * * @return a LayoutEngine which can layout text in the given font. * * @see LEFontInstance * * @stable ICU 2.8 */ static LayoutEngine *layoutEngineFactory(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, LEErrorCode &success); /** * Override of existing call that provides flags to control typography. * @stable ICU 3.4 */ static LayoutEngine *layoutEngineFactory(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typo_flags, LEErrorCode &success); /** * ICU "poor man's RTTI", returns a UClassID for the actual class. * * @stable ICU 2.8 */ virtual UClassID getDynamicClassID() const; /** * ICU "poor man's RTTI", returns a UClassID for this class. * * @stable ICU 2.8 */ static UClassID getStaticClassID(); }; U_NAMESPACE_END #endif