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/*
**********************************************************************
* Copyright (C) 1998-2010, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
*/
#ifndef __LEGLYPHSTORAGE_H
#define __LEGLYPHSTORAGE_H
#include "LETypes.h"
#include "LEInsertionList.h"
/**
* \file
* \brief C++ API: This class encapsulates the per-glyph storage used by the ICU LayoutEngine.
*/
U_NAMESPACE_BEGIN
/**
* This class encapsulates the per-glyph storage used by the ICU LayoutEngine.
* For each glyph it holds the glyph ID, the index of the backing store character
* which produced the glyph, the X and Y position of the glyph and an auxillary data
* pointer.
*
* The storage is growable using the <code>LEInsertionList</code> class.
*
*
* @see LEInsertionList.h
*
* @stable ICU 3.6
*/
class U_LAYOUT_API LEGlyphStorage : public UObject, protected LEInsertionCallback
{
private:
/**
* The number of entries in the per-glyph arrays.
*
* @internal
*/
le_int32 fGlyphCount;
/**
* The glyph ID array.
*
* @internal
*/
LEGlyphID *fGlyphs;
/**
* The char indices array.
*
* @internal
*/
le_int32 *fCharIndices;
/**
* The glyph positions array.
*
* @internal
*/
float *fPositions;
/**
* The auxillary data array.
*
* @internal
*/
le_uint32 *fAuxData;
/**
* The insertion list, used to grow the above arrays.
*
* @internal
*/
LEInsertionList *fInsertionList;
/**
* The source index while growing the data arrays.
*
* @internal
*/
le_int32 fSrcIndex;
/**
* The destination index used while growing the data arrays.
*
* @internal
*/
le_int32 fDestIndex;
protected:
/**
* This implements <code>LEInsertionCallback</code>. The <code>LEInsertionList</code>
* will call this method once for each insertion.
*
* @param atPosition the position of the insertion
* @param count the number of glyphs being inserted
* @param newGlyphs the address of the new glyph IDs
*
* @return <code>true</code> if <code>LEInsertionList</code> should stop
* processing the insertion list after this insertion.
*
* @see LEInsertionList.h
*
* @stable ICU 3.0
*/
virtual le_bool applyInsertion(le_int32 atPosition, le_int32 count, LEGlyphID newGlyphs[]);
public:
/**
* Allocates an empty <code>LEGlyphStorage</code> object. You must call
* <code>allocateGlyphArray, allocatePositions and allocateAuxData</code>
* to allocate the data.
*
* @stable ICU 3.0
*/
LEGlyphStorage();
/**
* The destructor. This will deallocate all of the arrays.
*
* @stable ICU 3.0
*/
~LEGlyphStorage();
/**
* This method returns the number of glyphs in the glyph array.
*
* @return the number of glyphs in the glyph array
*
* @stable ICU 3.0
*/
inline 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 3.0
*/
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 3.0
*/
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 3.0
*/
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 3.0
*/
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 3.0
*/
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 3.0
*/
void getGlyphPosition(le_int32 glyphIndex, float &x, float &y, LEErrorCode &success) const;
/**
* This method allocates the glyph array, the char indices array and the insertion list. You
* must call this method before using the object. This method also initializes the char indices
* array.
*
* @param initialGlyphCount the initial size of the glyph and char indices arrays.
* @param rightToLeft <code>true</code> if the original input text is right to left.
* @param success set to an error code if the storage cannot be allocated of if the initial
* glyph count is not positive.
*
* @stable ICU 3.0
*/
void allocateGlyphArray(le_int32 initialGlyphCount, le_bool rightToLeft, LEErrorCode &success);
/**
* This method allocates the storage for the glyph positions. It allocates one extra X, Y
* position pair for the position just after the last glyph.
*
* @param success set to an error code if the positions array cannot be allocated.
*
* @return the number of X, Y position pairs allocated.
*
* @stable ICU 3.0
*/
le_int32 allocatePositions(LEErrorCode &success);
/**
* This method allocates the storage for the auxillary glyph data.
*
* @param success set to an error code if the aulillary data array cannot be allocated.
*
* @return the size of the auxillary data array.
*
* @stable ICU 3.6
*/
le_int32 allocateAuxData(LEErrorCode &success);
/**
* Copy the entire auxillary data array.
*
* @param auxData the auxillary data array will be copied to this address
* @param success set to an error code if the data cannot be copied
*
* @stable ICU 3.6
*/
void getAuxData(le_uint32 auxData[], LEErrorCode &success) const;
/**
* Get the glyph ID for a particular glyph.
*
* @param glyphIndex the index into the glyph array
* @param success set to an error code if the glyph ID cannot be retrieved.
*
* @return the glyph ID
*
* @stable ICU 3.0
*/
LEGlyphID getGlyphID(le_int32 glyphIndex, LEErrorCode &success) const;
/**
* Get the char index for a particular glyph.
*
* @param glyphIndex the index into the glyph array
* @param success set to an error code if the char index cannot be retrieved.
*
* @return the character index
*
* @stable ICU 3.0
*/
le_int32 getCharIndex(le_int32 glyphIndex, LEErrorCode &success) const;
/**
* Get the auxillary data for a particular glyph.
*
* @param glyphIndex the index into the glyph array
* @param success set to an error code if the auxillary data cannot be retrieved.
*
* @return the auxillary data
*
* @stable ICU 3.6
*/
le_uint32 getAuxData(le_int32 glyphIndex, LEErrorCode &success) const;
/**
* This operator allows direct access to the glyph array
* using the index operator.
*
* @param glyphIndex the index into the glyph array
*
* @return a reference to the given location in the glyph array
*
* @stable ICU 3.0
*/
inline LEGlyphID &operator[](le_int32 glyphIndex) const;
/**
* Call this method to replace a single glyph in the glyph array
* with multiple glyphs. This method uses the <code>LEInsertionList</code>
* to do the insertion. It returns the address of storage where the new
* glyph IDs can be stored. They will not actually be inserted into the
* glyph array until <code>applyInsertions</code> is called.
*
* @param atIndex the index of the glyph to be replaced
* @param insertCount the number of glyphs to replace it with
* @param success set to an error code if the auxillary data cannot be retrieved.
*
* @return the address at which to store the replacement glyphs.
*
* @see LEInsertionList.h
*
* @stable ICU 4.2
*/
LEGlyphID *insertGlyphs(le_int32 atIndex, le_int32 insertCount, LEErrorCode& success);
/**
* Call this method to replace a single glyph in the glyph array
* with multiple glyphs. This method uses the <code>LEInsertionList</code>
* to do the insertion. It returns the address of storage where the new
* glyph IDs can be stored. They will not actually be inserted into the
* glyph array until <code>applyInsertions</code> is called.
*
* Note: Don't use this version, use the other version of this function which has an error code.
*
* @param atIndex the index of the glyph to be replaced
* @param insertCount the number of glyphs to replace it with
*
* @return the address at which to store the replacement glyphs.
*
* @see LEInsertionList.h
*
* @stable ICU 3.0
*/
LEGlyphID *insertGlyphs(le_int32 atIndex, le_int32 insertCount);
/**
* This method is used to reposition glyphs during Indic v2 processing. It moves
* all of the relevant glyph information ( glyph, indices, positions, and auxData ),
* from the source position to the target position, and also allows for a marker bit
* to be set in the target glyph's auxData so that it won't be reprocessed later in the
* cycle.
*
* @param fromPosition - position of the glyph to be moved
* @param toPosition - target position of the glyph
* @param marker marker bit
*
* @stable ICU 4.2
*/
void moveGlyph(le_int32 fromPosition, le_int32 toPosition, le_uint32 marker);
/**
* This method causes all of the glyph insertions recorded by
* <code>insertGlyphs</code> to be applied to the glyph array. The
* new slots in the char indices and the auxillary data arrays
* will be filled in with the values for the glyph being replaced.
*
* @return the new size of the glyph array
*
* @see LEInsertionList.h
*
* @stable ICU 3.0
*/
le_int32 applyInsertions();
/**
* Set the glyph ID for a particular glyph.
*
* @param glyphIndex the index of the glyph
* @param glyphID the new glyph ID
* @param success will be set to an error code if the glyph ID cannot be set.
*
* @stable ICU 3.0
*/
void setGlyphID(le_int32 glyphIndex, LEGlyphID glyphID, LEErrorCode &success);
/**
* Set the char index for a particular glyph.
*
* @param glyphIndex the index of the glyph
* @param charIndex the new char index
* @param success will be set to an error code if the char index cannot be set.
*
* @stable ICU 3.0
*/
void setCharIndex(le_int32 glyphIndex, le_int32 charIndex, LEErrorCode &success);
/**
* Set the X, Y position for a particular glyph.
*
* @param glyphIndex the index of the glyph
* @param x the new X position
* @param y the new Y position
* @param success will be set to an error code if the position cannot be set.
*
* @stable ICU 3.0
*/
void setPosition(le_int32 glyphIndex, float x, float y, LEErrorCode &success);
/**
* Adjust the X, Y position for a particular glyph.
*
* @param glyphIndex the index of the glyph
* @param xAdjust the adjustment to the glyph's X position
* @param yAdjust the adjustment to the glyph's Y position
* @param success will be set to an error code if the glyph's position cannot be adjusted.
*
* @stable ICU 3.0
*/
void adjustPosition(le_int32 glyphIndex, float xAdjust, float yAdjust, LEErrorCode &success);
/**
* Set the auxillary data for a particular glyph.
*
* @param glyphIndex the index of the glyph
* @param auxData the new auxillary data
* @param success will be set to an error code if the auxillary data cannot be set.
*
* @stable ICU 3.6
*/
void setAuxData(le_int32 glyphIndex, le_uint32 auxData, LEErrorCode &success);
/**
* Delete the glyph array and replace it with the one
* in <code>from</code>. Set the glyph array pointer
* in <code>from</code> to <code>NULL</code>.
*
* @param from the <code>LEGlyphStorage</code> object from which
* to get the new glyph array.
*
* @stable ICU 3.0
*/
void adoptGlyphArray(LEGlyphStorage &from);
/**
* Delete the char indices array and replace it with the one
* in <code>from</code>. Set the char indices array pointer
* in <code>from</code> to <code>NULL</code>.
*
* @param from the <code>LEGlyphStorage</code> object from which
* to get the new char indices array.
*
* @stable ICU 3.0
*/
void adoptCharIndicesArray(LEGlyphStorage &from);
/**
* Delete the position array and replace it with the one
* in <code>from</code>. Set the position array pointer
* in <code>from</code> to <code>NULL</code>.
*
* @param from the <code>LEGlyphStorage</code> object from which
* to get the new position array.
*
* @stable ICU 3.0
*/
void adoptPositionArray(LEGlyphStorage &from);
/**
* Delete the auxillary data array and replace it with the one
* in <code>from</code>. Set the auxillary data array pointer
* in <code>from</code> to <code>NULL</code>.
*
* @param from the <code>LEGlyphStorage</code> object from which
* to get the new auxillary data array.
*
* @stable ICU 3.0
*/
void adoptAuxDataArray(LEGlyphStorage &from);
/**
* Change the glyph count of this object to be the same
* as the one in <code>from</code>.
*
* @param from the <code>LEGlyphStorage</code> object from which
* to get the new glyph count.
*
* @stable ICU 3.0
*/
void adoptGlyphCount(LEGlyphStorage &from);
/**
* Change the glyph count of this object to the given value.
*
* @param newGlyphCount the new glyph count.
*
* @stable ICU 3.0
*/
void adoptGlyphCount(le_int32 newGlyphCount);
/**
* This method frees the glyph, character index, position and
* auxillary data arrays so that the LayoutEngine can be reused
* to layout a different characer array. (This method is also called
* by the destructor)
*
* @stable ICU 3.0
*/
void reset();
/**
* ICU "poor man's RTTI", returns a UClassID for the actual class.
*
* @stable ICU 3.0
*/
virtual UClassID getDynamicClassID() const;
/**
* ICU "poor man's RTTI", returns a UClassID for this class.
*
* @stable ICU 3.0
*/
static UClassID getStaticClassID();
};
inline le_int32 LEGlyphStorage::getGlyphCount() const
{
return fGlyphCount;
}
inline LEGlyphID &LEGlyphStorage::operator[](le_int32 glyphIndex) const
{
return fGlyphs[glyphIndex];
}
U_NAMESPACE_END
#endif