+++ /dev/null
-
-/*
- *
- * (C) Copyright IBM Corp. 1998-2014 - All Rights Reserved
- *
- */
-
-#ifndef __ARABICLAYOUTENGINE_H
-#define __ARABICLAYOUTENGINE_H
-
-#include "LETypes.h"
-#include "LEFontInstance.h"
-#include "LEGlyphFilter.h"
-#include "LayoutEngine.h"
-#include "OpenTypeLayoutEngine.h"
-
-#include "GlyphSubstitutionTables.h"
-#include "GlyphDefinitionTables.h"
-#include "GlyphPositioningTables.h"
-
-U_NAMESPACE_BEGIN
-
-/**
- * This class implements OpenType layout for Arabic fonts. It overrides
- * the characerProcessing method to assign the correct OpenType feature
- * tags for the Arabic contextual forms. It also overrides the adjustGlyphPositions
- * method to guarantee that all vowel and accent glyphs have zero advance width.
- *
- * @internal
- */
-class ArabicOpenTypeLayoutEngine : public OpenTypeLayoutEngine
-{
-public:
- /**
- * This is the main constructor. It constructs an instance of ArabicOpenTypeLayoutEngine for
- * a particular font, script and language. It takes the GSUB table as a parameter since
- * LayoutEngine::layoutEngineFactory has to read the GSUB table to know that it has an
- * Indic OpenType font.
- *
- * @param fontInstance - the font
- * @param scriptCode - the script
- * @param langaugeCode - the language
- * @param gsubTable - the GSUB table
- * @param success - set to an error code if the operation fails
- *
- * @see LayoutEngine::layoutEngineFactory
- * @see OpenTypeLayoutEngine
- * @see ScriptAndLanguageTags.h for script and language codes
- *
- * @internal
- */
- ArabicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
- le_int32 typoFlags, const LEReferenceTo<GlyphSubstitutionTableHeader> &gsubTable, LEErrorCode &success);
-
- /**
- * This constructor is used when the font requires a "canned" GSUB table which can't be known
- * until after this constructor has been invoked.
- *
- * @param fontInstance - the font
- * @param scriptCode - the script
- * @param langaugeCode - the language
- * @param success - set to an error code if the operation fails
- *
- * @see OpenTypeLayoutEngine
- * @see ScriptAndLanguageTags.h for script and language codes
- *
- * @internal
- */
- ArabicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
- le_int32 typoFlags, LEErrorCode &success);
-
- /**
- * The destructor, virtual for correct polymorphic invocation.
- *
- * @internal
- */
- virtual ~ArabicOpenTypeLayoutEngine();
-
- /**
- * ICU "poor man's RTTI", returns a UClassID for the actual class.
- *
- * @deprecated ICU 54. See {@link icu::LayoutEngine}
- */
- virtual UClassID getDynamicClassID() const;
-
- /**
- * ICU "poor man's RTTI", returns a UClassID for this class.
- *
- * @deprecated ICU 54. See {@link icu::LayoutEngine}
- */
- static UClassID getStaticClassID();
-
-protected:
-
- /**
- * This method does Arabic OpenType character processing. It assigns the OpenType feature
- * tags to the characters to generate the correct contextual forms and ligatures.
- *
- * Input parameters:
- * @param chars - the input character context
- * @param offset - the index 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 - <code>TRUE</code> if the characters are in a right to left directional run
- *
- * Output parameters:
- * @param outChars - the output character arrayt
- * @param charIndices - the output character index array
- * @param featureTags - the output feature tag array
- * @param success - set to an error code if the operation fails
- *
- * @return the output character count
- *
- * @internal
- */
- virtual le_int32 characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
- LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success);
-
- /**
- * This method applies the GPOS table if it is present, otherwise it ensures that all vowel
- * and accent glyphs have a zero advance width by calling the adjustMarkGlyphs method.
- * If the font contains a GDEF table, that is used to identify voewls and accents. Otherwise
- * the character codes are used.
- *
- * @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 reverse - <code>TRUE</code> if the glyphs in the glyph array have been reordered
- * @param glyphs - the input glyph array
- * @param glyphCount - the number of glyphs
- * @param positions - the position array, will be updated as needed
- * @param success - output parameter set to an error code if the operation fails
- *
- * @internal
- */
- virtual void adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, LEGlyphStorage &glyphStorage, LEErrorCode &success);
-
- // static void adjustMarkGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool rightToLeft, LEGlyphStorage &glyphStorage, LEErrorCode &success);
-
-};
-
-/**
- * The class implements OpenType layout for Arabic fonts which don't
- * contain a GSUB table, using a canned GSUB table based on Unicode
- * Arabic Presentation Forms. It overrides the mapCharsToGlyphs method
- * to use the Presentation Forms as logical glyph indices. It overrides the
- * glyphPostProcessing method to convert the Presentation Forms to actual
- * glyph indices.
- *
- * @see ArabicOpenTypeLayoutEngine
- *
- * @internal
- */
-class UnicodeArabicOpenTypeLayoutEngine : public ArabicOpenTypeLayoutEngine
-{
-public:
- /**
- * This constructs an instance of UnicodeArabicOpenTypeLayoutEngine for a specific font,
- * script and language.
- *
- * @param fontInstance - the font
- * @param scriptCode - the script
- * @param languageCode - the language
- * @param success - set to an error code if the operation fails
- *
- * @see LEFontInstance
- * @see ScriptAndLanguageTags.h for script and language codes
- *
- * @internal
- */
- UnicodeArabicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
- le_int32 typoFlags, LEErrorCode &success);
-
- /**
- * The destructor, virtual for correct polymorphic invocation.
- *
- * @internal
- */
- virtual ~UnicodeArabicOpenTypeLayoutEngine();
-
-protected:
-
- /**
- * This method converts the Arabic Presentation Forms in the temp glyph array
- * into actual glyph indices using ArabicOpenTypeLayoutEngine::mapCharsToGlyps.
- *
- * Input paramters:
- * @param tempGlyphs - the input presentation forms
- * @param tempCharIndices - the input character index array
- * @param tempGlyphCount - the number of Presentation Froms
- *
- * Output parameters:
- * @param glyphs - the output glyph index array
- * @param charIndices - the output character index array
- * @param success - set to an error code if the operation fails
- *
- * @return the number of glyph indices in the output glyph index array
- *
- * @internal
- */
- virtual le_int32 glyphPostProcessing(LEGlyphStorage &tempGlyphStorage, LEGlyphStorage &glyphStorage, LEErrorCode &success);
-
- /**
- * This method copies the input characters into the output glyph index array,
- * for use by the canned GSUB table. It also generates the character index array.
- *
- * Input parameters:
- * @param chars - the input character context
- * @param offset - the offset of the first character to be mapped
- * @param count - the number of characters to be mapped
- * @param reverse - if <code>TRUE</code>, the output will be in reverse order
- * @param mirror - if <code>TRUE</code>, do character mirroring
- * @param glyphStorage - the glyph storage object. Glyph and char index arrays will be updated.
- *
- * @param success - set to an error code if the operation fails
- *
- * @internal
- */
- virtual void mapCharsToGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, le_bool mirror,
- LEGlyphStorage &glyphStorage, LEErrorCode &success);
-
- /**
- * This method ensures that all vowel and accent glyphs have a zero advance width by calling
- * the adjustMarkGlyphs method. The character codes are used to identify the vowel and mark
- * glyphs.
- *
- * @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 reverse - <code>TRUE</code> if the glyphs in the glyph array have been reordered
- * @param glyphStorage - the glyph storage object. The glyph positions will be updated as needed.
- * @param success - output parameter set to an error code if the operation fails
- *
- * @internal
- */
- virtual void adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, LEGlyphStorage &glyphStorage, LEErrorCode &success);
-};
-
-U_NAMESPACE_END
-#endif
-
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