54c0657bab
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8080 a95241bf-73f2-0310-859d-f6bbb57e9c96
76 lines
2.7 KiB
C++
76 lines
2.7 KiB
C++
/*
|
|
* Copyright (c) 2003-2004 OpenBeOS
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
* DEALINGS IN THE SOFTWARE.
|
|
*
|
|
* File: WidthBuffer.cpp
|
|
* Author: Stefano Ceccherini (burton666@libero.it)
|
|
* Description: _BWidthBuffer_ stores charachters widths in a hash table, to be able
|
|
* to retrieve them without passing through the app server.
|
|
* Used by BTextView and OpenTracker.
|
|
*/
|
|
#ifndef __WIDTHBUFFER_H
|
|
#define __WIDTHBUFFER_H
|
|
|
|
#include "TextViewSupportBuffer.h"
|
|
|
|
class BFont; // forward declaration
|
|
|
|
// TODO: enable this as soon as we are sure opentracker works
|
|
// with our libraries, since using a BFont here (as Dano does) is much better,
|
|
// as fonts can be classified also by spacing mode and other attributes.
|
|
#define USE_DANO_WIDTHBUFFER 0
|
|
|
|
struct _width_table_ {
|
|
#if USE_DANO_WIDTHBUFFER
|
|
BFont font; // corresponding font
|
|
#else
|
|
int32 fontCode; // font code
|
|
float fontSize; // font size
|
|
#endif
|
|
int32 hashCount; // number of hashed items
|
|
int32 tableCount; // size of table
|
|
void *widths; // width table
|
|
};
|
|
|
|
|
|
class _BTextGapBuffer_;
|
|
class _BWidthBuffer_ : public _BTextViewSupportBuffer_<_width_table_> {
|
|
public:
|
|
_BWidthBuffer_();
|
|
virtual ~_BWidthBuffer_();
|
|
|
|
float StringWidth(const char *inText, int32 fromOffset, int32 length,
|
|
const BFont *inStyle);
|
|
float StringWidth(_BTextGapBuffer_ &gapBuffer, int32 fromOffset, int32 length,
|
|
const BFont *inStyle);
|
|
|
|
private:
|
|
bool FindTable(const BFont *font, int32 *outIndex);
|
|
int32 InsertTable(const BFont *font);
|
|
|
|
bool GetEscapement(uint32 value, int32 index, float *escapement);
|
|
float HashEscapements(const char *chars, int32 numChars, int32 numBytes,
|
|
int32 tableIndex, const BFont *font);
|
|
|
|
static uint32 Hash(uint32);
|
|
};
|
|
|
|
#endif // __WIDTHBUFFER_H
|