85 lines
1.6 KiB
C++
85 lines
1.6 KiB
C++
/*
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* Copyright 2003-2010, Haiku, Inc.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef __WIDTHBUFFER_H
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#define __WIDTHBUFFER_H
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#include <Locker.h>
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#include <TextView.h>
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#include "TextViewSupportBuffer.h"
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class BFont;
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namespace BPrivate {
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class TextGapBuffer;
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struct _width_table_ {
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BFont font; // corresponding font
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int32 hashCount; // number of hashed items
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int32 tableCount; // size of table
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void* widths; // width table
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};
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class WidthBuffer : public _BTextViewSupportBuffer_<_width_table_> {
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public:
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WidthBuffer();
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virtual ~WidthBuffer();
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float StringWidth(const char* inText,
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int32 fromOffset, int32 length,
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const BFont* inStyle);
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float StringWidth(TextGapBuffer& gapBuffer,
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int32 fromOffset, int32 length,
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const BFont* inStyle);
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private:
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bool FindTable(const BFont* font, int32* outIndex);
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int32 InsertTable(const BFont* font);
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bool GetEscapement(uint32 value, int32 index,
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float* escapement);
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float HashEscapements(const char* chars,
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int32 numChars, int32 numBytes,
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int32 tableIndex, const BFont* font);
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static uint32 Hash(uint32);
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private:
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BLocker fLock;
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};
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extern WidthBuffer* gWidthBuffer;
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} // namespace BPrivate
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using BPrivate::WidthBuffer;
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#if __GNUC__ < 3
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//! NetPositive binary compatibility support
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class _BWidthBuffer_ : public _BTextViewSupportBuffer_<BPrivate::_width_table_> {
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_BWidthBuffer_();
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virtual ~_BWidthBuffer_();
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};
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extern
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_BWidthBuffer_* gCompatibilityWidthBuffer;
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#endif // __GNUC__ < 3
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#endif // __WIDTHBUFFER_H
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