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git-svn-id: file:///srv/svn/repos/haiku/trunk/current@7188 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Stefano Ceccherini 2004-04-09 11:07:35 +00:00
parent 64e8448a05
commit ac41b0f103
1 changed files with 38 additions and 4 deletions
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42
headers/private/interface/WidthBuffer.h
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@ -1,10 +1,42 @@
/*
* 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"
// 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 B_BEOS_VERSION_DANO
#if USE_DANO_WIDTHBUFFER
BFont font; // corresponding font
#else
int32 fontCode; // font code
@ -15,6 +47,7 @@ struct _width_table_ {
void *widths; // width table
};
class _BTextGapBuffer_;
class _BWidthBuffer_ : public _BTextViewSupportBuffer_<_width_table_> {
public:
@ -23,15 +56,16 @@ public:
float StringWidth(const char *inText, int32 fromOffset, int32 length,
const BFont *inStyle);
float StringWidth(_BTextGapBuffer_ &, int32 fromOffset, int32 length,
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, int32, float *);
float HashEscapements(const char *, int32, int32, int32, const BFont *);
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);
};