1 /* 2 * Copyright (c) 2003-2004 OpenBeOS 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 19 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 20 * DEALINGS IN THE SOFTWARE. 21 * 22 * File: WidthBuffer.cpp 23 * Author: Stefano Ceccherini (burton666@libero.it) 24 * Description: _BWidthBuffer_ stores charachters widths in a hash table, to be able 25 * to retrieve them without passing through the app server. 26 * Used by BTextView and OpenTracker. 27 */ 28 #ifndef __WIDTHBUFFER_H 29 #define __WIDTHBUFFER_H 30 31 #include "TextViewSupportBuffer.h" 32 33 // TODO: enable this as soon as we are sure opentracker works 34 // with our libraries, since using a BFont here (as Dano does) is much better, 35 // as fonts can be classified also by spacing mode and other attributes. 36 #define USE_DANO_WIDTHBUFFER 0 37 38 struct _width_table_ { 39 #if USE_DANO_WIDTHBUFFER 40 BFont font; // corresponding font 41 #else 42 int32 fontCode; // font code 43 float fontSize; // font size 44 #endif 45 int32 hashCount; // number of hashed items 46 int32 tableCount; // size of table 47 void *widths; // width table 48 }; 49 50 51 class _BTextGapBuffer_; 52 class _BWidthBuffer_ : public _BTextViewSupportBuffer_<_width_table_> { 53 public: 54 _BWidthBuffer_(); 55 virtual ~_BWidthBuffer_(); 56 57 float StringWidth(const char *inText, int32 fromOffset, int32 length, 58 const BFont *inStyle); 59 float StringWidth(_BTextGapBuffer_ &gapBuffer, int32 fromOffset, int32 length, 60 const BFont *inStyle); 61 62 private: 63 bool FindTable(const BFont *font, int32 *outIndex); 64 int32 InsertTable(const BFont *font); 65 66 bool GetEscapement(uint32 value, int32 index, float *escapement); 67 float HashEscapements(const char *chars, int32 numChars, int32 numBytes, 68 int32 tableIndex, const BFont *font); 69 70 static uint32 Hash(uint32); 71 }; 72 73 #endif // __WIDTHBUFFER_H 74