mirror of
https://git.lyx.org/repos/lyx.git
synced 2024-11-24 18:43:37 +00:00
0ee7c6e283
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@21588 a592a061-630c-0410-9148-cb99ea01b6c8
124 lines
3.6 KiB
C++
124 lines
3.6 KiB
C++
// -*- C++ -*-
|
|
/**
|
|
* \file FontMetrics.h
|
|
* This file is part of LyX, the document processor.
|
|
* Licence details can be found in the file COPYING.
|
|
*
|
|
* \author unknown
|
|
* \author John Levon
|
|
* \author Abdelrazak Younes
|
|
*
|
|
* Full author contact details are available in file CREDITS.
|
|
*/
|
|
|
|
#ifndef FONT_METRICS_H
|
|
#define FONT_METRICS_H
|
|
|
|
#include "support/strfwd.h"
|
|
|
|
/**
|
|
* A class holding helper functions for determining
|
|
* the screen dimensions of fonts.
|
|
*
|
|
* The geometry is the standard typographical geometry,
|
|
* as follows :
|
|
*
|
|
* --------------+------------------<maxAscent
|
|
* | |
|
|
* <-------> (right bearing)
|
|
* <-> (left bearing)
|
|
* char ascent>___ |
|
|
* ^ oooo | oooo
|
|
* origin>____ | oo oo | oo oo
|
|
* \| oo oo | oo oo
|
|
* --------------+---ooooo--|--oooo-<baseline
|
|
* | oo |
|
|
* char | oo oo |
|
|
* descent>______| oooo |
|
|
* <- width ->
|
|
* --------------+----------+-------<maxDescent
|
|
*
|
|
* Caution: All char_type and docstring arguments of any method of this class
|
|
* are no UCS4 chars or strings if the font is a symbol font. They simply
|
|
* denote the code points of the font instead. You have to keep this in mind
|
|
* when you implement the methods in a frontend. You must not pass these
|
|
* parameters to a unicode conversion function in particular.
|
|
*/
|
|
|
|
namespace lyx {
|
|
|
|
class Dimension;
|
|
|
|
namespace frontend {
|
|
|
|
class FontMetrics
|
|
{
|
|
public:
|
|
virtual ~FontMetrics() {}
|
|
|
|
/// return the maximum ascent of the font
|
|
virtual int maxAscent() const = 0;
|
|
/// return the maximum descent of the font
|
|
virtual int maxDescent() const = 0;
|
|
/// return default dimension of the font.
|
|
/// \warning \c width is set to zero.
|
|
virtual Dimension const defaultDimension() const = 0;
|
|
/// return the width of the char in the font
|
|
virtual int width(char_type c) const = 0;
|
|
/// return the ascent of the char in the font
|
|
virtual int ascent(char_type c) const = 0;
|
|
/// return the descent of the char in the font
|
|
virtual int descent(char_type c) const = 0;
|
|
/// return the left bearing of the char in the font
|
|
virtual int lbearing(char_type c) const = 0;
|
|
/// return the right bearing of the char in the font
|
|
virtual int rbearing(char_type c) const = 0;
|
|
/// return the width of the string in the font
|
|
virtual int width(docstring const & s) const = 0;
|
|
/// FIXME ??
|
|
virtual int signedWidth(docstring const & s) const = 0;
|
|
/// return char dimension for the font.
|
|
virtual Dimension const dimension(char_type c) const = 0;
|
|
/**
|
|
* fill in width,ascent,descent with the values for the
|
|
* given string in the font.
|
|
*/
|
|
virtual void rectText(docstring const & str,
|
|
int & width,
|
|
int & ascent,
|
|
int & descent) const = 0;
|
|
/**
|
|
* fill in width,ascent,descent with the values for the
|
|
* given string in the font for a button.
|
|
*/
|
|
virtual void buttonText(docstring const & str,
|
|
int & width,
|
|
int & ascent,
|
|
int & descent) const = 0;
|
|
|
|
/// return the maximum descent of the font
|
|
inline int maxHeight() const { return maxAscent() + maxDescent(); }
|
|
|
|
/// return the descent of the char in the font
|
|
inline int height(char_type c) const { return ascent(c) + descent(c); }
|
|
|
|
/// return the inner width of the char in the font
|
|
inline int center(char_type c) const {
|
|
return (rbearing(c) - lbearing(c)) / 2;
|
|
}
|
|
};
|
|
|
|
|
|
} // namespace frontend
|
|
|
|
class Font;
|
|
class FontInfo;
|
|
|
|
/// Implementation is in Application.cpp
|
|
frontend::FontMetrics const & theFontMetrics(Font const & f);
|
|
frontend::FontMetrics const & theFontMetrics(FontInfo const & fi);
|
|
|
|
} // namespace lyx
|
|
|
|
#endif // FONT_METRICS_H
|