90b7764dc3
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27675 a95241bf-73f2-0310-859d-f6bbb57e9c96
84 lines
2.7 KiB
C++
84 lines
2.7 KiB
C++
/*
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* Copyright (c) 2003-2004 OpenBeOS
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* File: WidthBuffer.cpp
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* Author: Stefano Ceccherini (burton666@libero.it)
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* Description: WidthBuffer stores charachters widths in a hash table, to be able
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* to retrieve them without passing through the app server.
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* Used by BTextView and OpenTracker.
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*/
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#ifndef __WIDTHBUFFER_H
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#define __WIDTHBUFFER_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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// TODO: enable this as soon as we are sure opentracker works
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// with our libraries, since using a BFont here (as Dano does) is much better,
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// as fonts can be classified also by spacing mode and other attributes.
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#define USE_DANO_WIDTHBUFFER 0
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namespace BPrivate {
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class TextGapBuffer;
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struct _width_table_ {
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#if USE_DANO_WIDTHBUFFER
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BFont font; // corresponding font
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#else
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int32 fontCode; // font code
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float fontSize; // font size
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#endif
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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, int32 fromOffset, int32 length,
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const BFont *inStyle);
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float StringWidth(TextGapBuffer &gapBuffer, int32 fromOffset,
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int32 length, 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, float *escapement);
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float HashEscapements(const char *chars, 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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};
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} // namespace BPrivate
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#endif // __WIDTHBUFFER_H
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