lyx_mirror/src/frontends/xforms/xfont_metrics.C
John Levon 11cad84732 font_metrics split, ok from asger (And it's obvious anyway ...)
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@4368 a592a061-630c-0410-9148-cb99ea01b6c8
2002-06-11 21:44:00 +00:00

247 lines
5.3 KiB
C

/**
* \file xfont_metrics.C
* Copyright 1995-2002 the LyX Team
* Read the file COPYING
*
* \author unknown
* \author John Levon <moz@compsoc.man.ac.uk>
*/
#include <config.h>
#ifdef __GNUG__
#pragma implementation "frontends/font_metrics.h"
#pragma implementation "frontends/xfont_metrics.h"
#endif
#include "support/lstrings.h"
#include "xfont_metrics.h"
#include "xfont_loader.h"
#include "lyxrc.h"
#include "encoding.h"
#include "language.h"
#include <boost/scoped_array.hpp>
namespace {
inline
XFontStruct * getXFontstruct(LyXFont const & f)
{
return fontloader.load
(f.family(), f.series(),
f.realShape(), f.size());
}
inline
XID getFontID(LyXFont const & f)
{
return getXFontstruct(f)->fid;
}
} // namespace anon
namespace font_metrics {
int maxAscent(LyXFont const & f)
{
return getXFontstruct(f)->ascent;
}
int maxDescent(LyXFont const & f)
{
return getXFontstruct(f)->descent;
}
int ascent(char c, LyXFont const & f)
{
XFontStruct * finfo = getXFontstruct(f);
unsigned int uc = static_cast<unsigned char>(c);
if (finfo->per_char
&& uc >= finfo->min_char_or_byte2
&& uc <= finfo->max_char_or_byte2+256*finfo->max_byte1)
return finfo->per_char[uc - finfo->min_char_or_byte2].ascent;
else
return finfo->ascent;
}
int descent(char c, LyXFont const & f)
{
XFontStruct * finfo = getXFontstruct(f);
unsigned int uc = static_cast<unsigned char>(c);
if (finfo->per_char
&& uc >= finfo->min_char_or_byte2
&& uc <= finfo->max_char_or_byte2+256*finfo->max_byte1)
return finfo->per_char[uc - finfo->min_char_or_byte2].descent;
else
return finfo->descent;
}
int lbearing(char c, LyXFont const & f)
{
XFontStruct * finfo = getXFontstruct(f);
unsigned int uc = static_cast<unsigned char>(c);
if (finfo->per_char
&& uc >= finfo->min_char_or_byte2
&& uc <= finfo->max_char_or_byte2+256*finfo->max_byte1)
return finfo->per_char[uc - finfo->min_char_or_byte2].lbearing;
else
return 0;
}
int rbearing(char c, LyXFont const & f)
{
XFontStruct * finfo = getXFontstruct(f);
unsigned int uc = static_cast<unsigned char>(c);
if (finfo->per_char
&& uc >= finfo->min_char_or_byte2
&& uc <= finfo->max_char_or_byte2+256*finfo->max_byte1)
return finfo->per_char[uc - finfo->min_char_or_byte2].rbearing;
else
return width(c, f);
}
int width(char const * s, size_t n, LyXFont const & f)
{
if (!lyxrc.use_gui)
return n;
if (lyxrc.font_norm_type == LyXRC::ISO_10646_1) {
boost::scoped_array<XChar2b> xs(new XChar2b[n]);
Encoding const * encoding = f.language()->encoding();
LyXFont font(f);
if (f.isSymbolFont()) {
#ifdef USE_UNICODE_FOR_SYMBOLS
font.setFamily(LyXFont::ROMAN_FAMILY);
font.setShape(LyXFont::UP_SHAPE);
#endif
encoding = encodings.symbol_encoding();
}
for (size_t i = 0; i < n; ++i) {
Uchar c = encoding->ucs(s[i]);
xs[i].byte1 = c >> 8;
xs[i].byte2 = c & 0xff;
}
int result = xfont_metrics::width(xs.get(), n, font);
return result;
}
if (f.realShape() != LyXFont::SMALLCAPS_SHAPE) {
return ::XTextWidth(getXFontstruct(f), s, n);
} else {
// emulate smallcaps since X doesn't support this
int result = 0;
LyXFont smallfont(f);
smallfont.decSize().decSize().setShape(LyXFont::UP_SHAPE);
for (size_t i = 0; i < n; ++i) {
char const c = uppercase(s[i]);
if (c != s[i]) {
result += ::XTextWidth(getXFontstruct(smallfont), &c, 1);
} else {
result += ::XTextWidth(getXFontstruct(f), &c, 1);
}
}
return result;
}
}
int signedWidth(string const & s, LyXFont const & f)
{
if (s.empty())
return 0;
if (s[0] == '-')
return -width(s.substr(1, s.length() - 1), f);
else
return width(s, f);
}
void rectText(string const & str, LyXFont const & font,
int & width,
int & ascent,
int & descent)
{
static int const d = 2;
width = font_metrics::width(str, font) + d * 2 + 2;
ascent = font_metrics::maxAscent(font) + d;
descent = font_metrics::maxDescent(font) + d;
}
void buttonText(string const & str, LyXFont const & font,
int & width,
int & ascent,
int & descent)
{
static int const d = 3;
width = font_metrics::width(str, font) + d * 2 + 2;
ascent = font_metrics::maxAscent(font) + d;
descent = font_metrics::maxDescent(font) + d;
}
} // namespace font_metrics
namespace xfont_metrics {
int width(XChar2b const * s, int n, LyXFont const & f)
{
if (!lyxrc.use_gui)
return n;
if (f.realShape() != LyXFont::SMALLCAPS_SHAPE) {
return ::XTextWidth16(getXFontstruct(f), s, n);
} else {
// emulate smallcaps since X doesn't support this
int result = 0;
static XChar2b c;
LyXFont smallfont(f);
smallfont.decSize().decSize().setShape(LyXFont::UP_SHAPE);
for (int i = 0; i < n; ++i) {
if (s[i].byte1)
c = s[i];
else {
c.byte1 = s[i].byte1;
c.byte2 = uppercase(s[i].byte2);
}
if (c.byte2 != s[i].byte2) {
result += ::XTextWidth16(getXFontstruct(smallfont), &c, 1);
} else {
result += ::XTextWidth16(getXFontstruct(f), &s[i], 1);
}
}
return result;
}
}
int XTextWidth(LyXFont const & f, char const * str, int count)
{
return ::XTextWidth(getXFontstruct(f), str, count);
}
int XTextWidth16(LyXFont const & f, XChar2b const * str, int count)
{
return ::XTextWidth16(getXFontstruct(f), str, count);
}
/// hmm, not a metric !
void XSetFont(Display * display, GC gc, LyXFont const & f)
{
::XSetFont(display, gc, getFontID(f));
}
} // namespace xfont_metrics