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Compute metrics of *TeX* logos using draw and a null painter

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Instead of writing a metrics() method that mimics what draw() does,
re-use the draw code with a null painter.

This has the additional benefit of fixing InsetSpecialChar logo width
with EB Garamond. I have to admit that I do not know why it was too
large with the old code, but the new code is shorter/better anyway.

This code removes logowidth(). metrics() is moved to a different
place, but only the logo cases are touched.
This commit is contained in:
Jean-Marc Lasgouttes 2019-05-07 10:47:49 +02:00
parent 43e9f589fc
commit 12fcaf8652
1 changed files with 59 additions and 97 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

156
src/insets/InsetSpecialChar.cpp
View File

@ -24,6 +24,7 @@
#include "texstream.h"
#include "frontends/FontMetrics.h"
#include "frontends/NullPainter.h"
#include "frontends/Painter.h"
#include "support/debug.h"
@ -45,48 +46,6 @@ InsetSpecialChar::Kind InsetSpecialChar::kind() const
}
namespace {
int logoWidth(FontInfo const & font, InsetSpecialChar::Kind kind) {
frontend::FontMetrics const & fm = theFontMetrics(font);
int const em = fm.em();
int width = 0;
// See drawlogo() below to understand what this does.
switch (kind) {
case InsetSpecialChar::PHRASE_LYX:
width = fm.width(from_ascii("L")) - em / 6
+ fm.width(from_ascii("Y")) - em / 8
+ fm.width(from_ascii("X"));
break;
case InsetSpecialChar::PHRASE_TEX:
width = fm.width(from_ascii("T")) - em / 6
+ fm.width(from_ascii("E")) - em / 8
+ fm.width(from_ascii("X"));
break;
case InsetSpecialChar::PHRASE_LATEX2E:
width = logoWidth(font, InsetSpecialChar::PHRASE_LATEX)
+ 3 * em / 20
+ fm.width(from_ascii("2") + char_type(0x03b5));
break;
case InsetSpecialChar::PHRASE_LATEX: {
FontInfo smaller = font;
smaller.decSize().decSize();
width = fm.width(from_ascii("L")) - 9 * em / 25
+ theFontMetrics(smaller).width(from_ascii("A")) - 3 * em / 20
+ logoWidth(font, InsetSpecialChar::PHRASE_TEX);
break;
}
default:
LYXERR0("No information for computing width of logo " << kind);
}
return width;
}
} // namespace
docstring InsetSpecialChar::toolTip(BufferView const &, int, int) const
{
docstring message;
@ -122,61 +81,6 @@ docstring InsetSpecialChar::toolTip(BufferView const &, int, int) const
}
void InsetSpecialChar::metrics(MetricsInfo & mi, Dimension & dim) const
{
frontend::FontMetrics const & fm =
theFontMetrics(mi.base.font);
dim.asc = fm.maxAscent();
dim.des = 0;
dim.wid = 0;
docstring s;
switch (kind_) {
case ALLOWBREAK:
dim.asc = fm.xHeight();
dim.des = fm.descent('g');
dim.wid = fm.em() / 8;
break;
case LIGATURE_BREAK:
s = from_ascii("|");
break;
case END_OF_SENTENCE:
s = from_ascii(".");
break;
case LDOTS:
s = from_ascii(". . .");
break;
case MENU_SEPARATOR:
// ▹ U+25B9 WHITE RIGHT-POINTING SMALL TRIANGLE
// There is a \thinspace on each side of the triangle
dim.wid = 2 * fm.em() / 6 + fm.width(char_type(0x25B9));
break;
case HYPHENATION:
dim.wid = fm.width(from_ascii("-"));
if (dim.wid > 5)
dim.wid -= 2; // to make it look shorter
break;
case SLASH:
s = from_ascii("/");
dim.des = fm.descent(s[0]);
break;
case NOBREAKDASH:
s = from_ascii("-");
break;
case PHRASE_LYX:
case PHRASE_TEX:
case PHRASE_LATEX2E:
case PHRASE_LATEX:
dim.asc = fm.maxAscent();
dim.des = fm.maxDescent();
dim.wid = logoWidth(mi.base.font, kind_);
break;
}
if (dim.wid == 0)
dim.wid = fm.width(s);
}
namespace {
// helper function: draw text and update x.
@ -258,6 +162,64 @@ void drawLogo(PainterInfo & pi, int & x, int const y, InsetSpecialChar::Kind kin
} // namespace
void InsetSpecialChar::metrics(MetricsInfo & mi, Dimension & dim) const
{
frontend::FontMetrics const & fm =
theFontMetrics(mi.base.font);
dim.asc = fm.maxAscent();
dim.des = 0;
dim.wid = 0;
docstring s;
switch (kind_) {
case ALLOWBREAK:
dim.asc = fm.xHeight();
dim.des = fm.descent('g');
dim.wid = fm.em() / 8;
break;
case LIGATURE_BREAK:
s = from_ascii("|");
break;
case END_OF_SENTENCE:
s = from_ascii(".");
break;
case LDOTS:
s = from_ascii(". . .");
break;
case MENU_SEPARATOR:
// ▹ U+25B9 WHITE RIGHT-POINTING SMALL TRIANGLE
// There is a \thinspace on each side of the triangle
dim.wid = 2 * fm.em() / 6 + fm.width(char_type(0x25B9));
break;
case HYPHENATION:
dim.wid = fm.width(from_ascii("-"));
if (dim.wid > 5)
dim.wid -= 2; // to make it look shorter
break;
case SLASH:
s = from_ascii("/");
dim.des = fm.descent(s[0]);
break;
case NOBREAKDASH:
s = from_ascii("-");
break;
case PHRASE_LYX:
case PHRASE_TEX:
case PHRASE_LATEX2E:
case PHRASE_LATEX:
dim.asc = fm.maxAscent();
dim.des = fm.maxDescent();
frontend::NullPainter np;
PainterInfo pi(mi.base.bv, np);
drawLogo(pi, dim.wid, 0, kind_);
break;
}
if (dim.wid == 0)
dim.wid = fm.width(s);
}
void InsetSpecialChar::draw(PainterInfo & pi, int x, int y) const
{
FontInfo font = pi.base.font;