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loengine.h
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/* * * (C) Copyright IBM Corp. 1998-2007 - All Rights Reserved * */ #ifndef __LOENGINE_H #define __LOENGINE_H #include "LETypes.h" /** * \file * \brief C API for complex text layout. * \internal * * This is a technology preview. The API may * change significantly. * */ /** * The opaque type for a LayoutEngine. * * @internal */ typedef void le_engine; /** * The opaque type for a font instance. * * @internal */ typedef void le_font; /** * This function returns an le_engine capable of laying out text * in the given font, script and langauge. Note that the LayoutEngine * returned may be a subclass of LayoutEngine. * * @param font - the font of the text * @param scriptCode - the script of the text * @param languageCode - the language of the text * @param typo_flags - flags that control layout features like kerning and ligatures. * @param success - output parameter set to an error code if the operation fails * * @return an le_engine which can layout text in the given font. * * @internal */ U_INTERNAL le_engine * U_EXPORT2 le_create(const le_font *font, le_int32 scriptCode, le_int32 languageCode, le_int32 typo_flags, LEErrorCode *success); /** * This function closes the given LayoutEngine. After * it returns, the le_engine is no longer valid. * * @param engine - the LayoutEngine to close. * * @internal */ U_INTERNAL void U_EXPORT2 le_close(le_engine *engine); /** * This routine will compute the glyph, character index and position arrays. * * @param engine - the LayoutEngine * @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 routines below. * * Note: If you call this function more than once, you must call the reset() * function first to free the glyph, character index and position arrays * allocated by the previous call. * * @internal */ U_INTERNAL le_int32 U_EXPORT2 le_layoutChars(le_engine *engine, const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, float x, float y, LEErrorCode *success); /** * This function 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. * * @param engine - the LayoutEngine * @param success - output parameter set to an error code if the operation fails. * * @return the number of glyphs in the glyph array * * @internal */ U_INTERNAL le_int32 U_EXPORT2 le_getGlyphCount(le_engine *engine, LEErrorCode *success); /** * This function 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 engine - the LayoutEngine * @param glyphs - the destiniation glyph array * @param success - set to an error code if the operation fails * * @internal */ U_INTERNAL void U_EXPORT2 le_getGlyphs(le_engine *engine, LEGlyphID glyphs[], LEErrorCode *success); /** * This function 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 engine - the LayoutEngine * @param charIndices - the destiniation character index array * @param success - set to an error code if the operation fails * * @internal */ U_INTERNAL void U_EXPORT2 le_getCharIndices(le_engine *engine, le_int32 charIndices[], LEErrorCode *success); /** * This function 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 engine - the LayoutEngine * @param charIndices - the destiniation character index array * @param indexBase - an offset that will be added to each index. * @param success - set to an error code if the operation fails * * @internal */ U_INTERNAL void U_EXPORT2 le_getCharIndicesWithBase(le_engine *engine, le_int32 charIndices[], le_int32 indexBase, LEErrorCode *success); /** * This function 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 engine - the LayoutEngine * @param positions - the destiniation position array * @param success - set to an error code if the operation fails * * @internal */ U_INTERNAL void U_EXPORT2 le_getGlyphPositions(le_engine *engine, float positions[], LEErrorCode *success); /** * This function returns the X and Y position of the glyph at * the given index. * * Input parameters: * @param engine - the LayoutEngine * @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 * * @internal */ U_INTERNAL void U_EXPORT2 le_getGlyphPosition(le_engine *engine, le_int32 glyphIndex, float *x, float *y, LEErrorCode *success); /** * This function frees the glyph, character index and position arrays * so that the LayoutEngine can be reused to layout a different * characer array. (This function is also called by le_close) * * @param engine - the LayoutEngine * @param success - set to an error code if the operation fails * * @internal */ U_INTERNAL void U_EXPORT2 le_reset(le_engine *engine, LEErrorCode *success); #endif