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e62684db34
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@19616 a592a061-630c-0410-9148-cb99ea01b6c8
363 lines
9.1 KiB
C++
363 lines
9.1 KiB
C++
/**
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* \file QLPainter.cpp
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author John Levon
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* \author Abdelrazak Younes
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*
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* Full author contact details are available in file CREDITS.
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*/
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#include <config.h>
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#include "QLPainter.h"
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#include "GuiApplication.h"
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#include "GuiFontMetrics.h"
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#include "QLImage.h"
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#include "GuiApplication.h"
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#include "qt_helpers.h"
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#include "debug.h"
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#include "Language.h"
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#include "Color.h"
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#include "support/unicode.h"
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#include <QPixmapCache>
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#include <QTextLayout>
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// Set USE_PIXMAP_CACHE to 1 for enabling the use of a Pixmap cache when
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// drawing text. This is especially useful for older PPC/Mac systems.
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#ifdef Q_WS_X11
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#define USE_PIXMAP_CACHE 0
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#else
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#define USE_PIXMAP_CACHE 1
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#endif
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using std::endl;
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using std::string;
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namespace lyx {
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namespace frontend {
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namespace {
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bool const usePixmapCache = USE_PIXMAP_CACHE;
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QString generateStringSignature(QString const & str, Font const & f)
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{
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QString sig = str;
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sig.append(QChar(static_cast<short>(f.family())));
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sig.append(QChar(static_cast<short>(f.series())));
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sig.append(QChar(static_cast<short>(f.realShape())));
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sig.append(QChar(static_cast<short>(f.size())));
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sig.append(QChar(static_cast<short>(f.color())));
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return sig;
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}
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} // anon namespace
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QLPainter::QLPainter(QPaintDevice * device)
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: QPainter(device), Painter()
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{
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// new QPainter has default QPen:
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current_color_ = Color::black;
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current_ls_ = line_solid;
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current_lw_ = line_thin;
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}
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QLPainter::~QLPainter()
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{
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QPainter::end();
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//lyxerr << "QLPainter::end()" << endl;
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}
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void QLPainter::setQPainterPen(Color_color col,
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Painter::line_style ls, Painter::line_width lw)
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{
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if (col == current_color_ && ls == current_ls_ && lw == current_lw_)
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return;
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current_color_ = col;
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current_ls_ = ls;
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current_lw_ = lw;
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QPen pen = QPainter::pen();
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pen.setColor(guiApp->colorCache().get(col));
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switch (ls) {
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case line_solid: pen.setStyle(Qt::SolidLine); break;
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case line_onoffdash: pen.setStyle(Qt::DotLine); break;
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}
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switch (lw) {
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case line_thin: pen.setWidth(0); break;
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case line_thick: pen.setWidth(3); break;
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}
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setPen(pen);
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}
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void QLPainter::point(int x, int y, Color_color col)
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{
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if (!isDrawingEnabled())
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return;
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setQPainterPen(col);
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drawPoint(x, y);
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}
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void QLPainter::line(int x1, int y1, int x2, int y2,
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Color_color col,
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line_style ls,
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line_width lw)
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{
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if (!isDrawingEnabled())
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return;
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setQPainterPen(col, ls, lw);
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bool const do_antialiasing = renderHints() & TextAntialiasing
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&& x1 != x2 && y1 != y2;
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setRenderHint(Antialiasing, do_antialiasing);
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drawLine(x1, y1, x2, y2);
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setRenderHint(Antialiasing, false);
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}
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void QLPainter::lines(int const * xp, int const * yp, int np,
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Color_color col,
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line_style ls,
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line_width lw)
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{
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if (!isDrawingEnabled())
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return;
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// double the size if needed
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static QVector<QPoint> points(32);
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if (np > points.size())
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points.resize(2 * np);
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bool antialias = false;
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for (int i = 0; i < np; ++i) {
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points[i].setX(xp[i]);
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points[i].setY(yp[i]);
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if (i != 0)
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antialias |= xp[i-1] != xp[i] && yp[i-1] != yp[i];
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}
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setQPainterPen(col, ls, lw);
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bool const text_is_antialiased = renderHints() & TextAntialiasing;
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setRenderHint(Antialiasing, antialias && text_is_antialiased);
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drawPolyline(points.data(), np);
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setRenderHint(Antialiasing, false);
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}
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void QLPainter::rectangle(int x, int y, int w, int h,
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Color_color col,
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line_style ls,
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line_width lw)
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{
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if (!isDrawingEnabled())
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return;
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setQPainterPen(col, ls, lw);
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drawRect(x, y, w, h);
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}
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void QLPainter::fillRectangle(int x, int y, int w, int h, Color_color col)
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{
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fillRect(x, y, w, h, guiApp->colorCache().get(col));
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}
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void QLPainter::arc(int x, int y, unsigned int w, unsigned int h,
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int a1, int a2, Color_color col)
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{
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if (!isDrawingEnabled())
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return;
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// LyX usings 1/64ths degree, Qt usings 1/16th
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setQPainterPen(col);
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bool const do_antialiasing = renderHints() & TextAntialiasing;
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setRenderHint(Antialiasing, do_antialiasing);
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drawArc(x, y, w, h, a1 / 4, a2 / 4);
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setRenderHint(Antialiasing, false);
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}
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void QLPainter::image(int x, int y, int w, int h, graphics::Image const & i)
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{
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graphics::QLImage const & qlimage =
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static_cast<graphics::QLImage const &>(i);
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fillRectangle(x, y, w, h, Color::graphicsbg);
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if (!isDrawingEnabled())
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return;
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drawImage(x, y, qlimage.qimage(), 0, 0, w, h);
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}
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int QLPainter::text(int x, int y, char_type c, Font const & f)
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{
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docstring s(1, c);
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return text(x, y, s, f);
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}
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int QLPainter::smallCapsText(int x, int y,
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QString const & s, Font const & f)
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{
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Font smallfont(f);
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smallfont.decSize().decSize().setShape(Font::UP_SHAPE);
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QFont const & qfont = guiApp->guiFontLoader().get(f);
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QFont const & qsmallfont = guiApp->guiFontLoader().get(smallfont);
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setQPainterPen(f.realColor());
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int textwidth = 0;
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size_t const ls = s.length();
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for (unsigned int i = 0; i < ls; ++i) {
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QChar const c = s[i].toUpper();
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if (c != s.at(i)) {
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setFont(qsmallfont);
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} else {
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setFont(qfont);
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}
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if (isDrawingEnabled())
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drawText(x + textwidth, y, c);
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textwidth += fontMetrics().width(c);
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}
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return textwidth;
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}
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int QLPainter::text(int x, int y, docstring const & s,
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Font const & f)
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{
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/* Caution: The following ucs4 to QString conversions work for symbol fonts
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only because they are no real conversions but simple casts in reality.
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When we want to draw a symbol or calculate the metrics we pass the position
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of the symbol in the font (as given in lib/symbols) as a char_type to the
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frontend. This is just wrong, because the symbol is no UCS4 character at
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all. You can think of this number as the code point of the symbol in a
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custom symbol encoding. It works because this char_type is lateron again
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interpreted as a position in the font again.
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The correct solution would be to have extra functions for symbols, but that
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would require to duplicate a lot of frontend and mathed support code.
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*/
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QString str = toqstr(s);
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#if 0
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// HACK: QT3 refuses to show single compose characters
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// Still needed with Qt4?
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if (ls == 1 && str[0].unicode() >= 0x05b0 && str[0].unicode() <= 0x05c2)
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str = ' ' + str;
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#endif
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QLFontInfo & fi = guiApp->guiFontLoader().fontinfo(f);
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int textwidth;
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if (f.realShape() == Font::SMALLCAPS_SHAPE) {
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textwidth = smallCapsText(x, y, str, f);
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if (f.underbar() == Font::ON)
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underline(f, x, y, textwidth);
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return textwidth;
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}
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// Here we use the font width cache instead of
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// textwidth = fontMetrics().width(str);
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// because the above is awfully expensive on MacOSX
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textwidth = fi.metrics->width(s);
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if (f.underbar() == Font::ON)
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underline(f, x, y, textwidth);
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if (!isDrawingEnabled())
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return textwidth;
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// Qt4 does not display a glyph whose codepoint is the
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// same as that of a soft-hyphen (0x00ad), unless it
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// occurs at a line-break. As a kludge, we force Qt to
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// render this glyph using a one-column line.
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if (s.size() == 1 && str[0].unicode() == 0x00ad) {
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setQPainterPen(f.realColor());
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QTextLayout adsymbol(str);
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adsymbol.setFont(fi.font);
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adsymbol.beginLayout();
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QTextLine line = adsymbol.createLine();
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line.setNumColumns(1);
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line.setPosition(QPointF(0, -line.ascent()));
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adsymbol.endLayout();
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line.draw(this, QPointF(x, y));
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return textwidth;
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}
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if (!usePixmapCache) {
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// don't use the pixmap cache,
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// draw directly onto the painting device
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setQPainterPen(f.realColor());
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if (font() != fi.font)
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setFont(fi.font);
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// We need to draw the text as LTR as we use our own bidi code.
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setLayoutDirection(Qt::LeftToRight);
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// We need to draw the text as LTR as we use our own bidi code.
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setLayoutDirection(Qt::LeftToRight);
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drawText(x, y, str);
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LYXERR(Debug::PAINTING) << "draw " << std::string(str.toUtf8())
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<< " at " << x << "," << y << std::endl;
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return textwidth;
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}
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QPixmap pm;
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QString key = generateStringSignature(str, f);
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// Warning: Left bearing is in general negative! Only the case
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// where left bearing is negative is of interest WRT the the
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// pixmap width and the text x-position.
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// Only the left bearing of the first character is important
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// as we always write from left to right, even for
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// right-to-left languages.
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int const lb = std::min(fi.metrics->lbearing(s[0]), 0);
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int const mA = fi.metrics->maxAscent();
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if (!QPixmapCache::find(key, pm)) {
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// Only the right bearing of the last character is
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// important as we always write from left to right,
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// even for right-to-left languages.
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int const rb = fi.metrics->rbearing(s[s.size()-1]);
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int const w = textwidth + rb - lb;
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int const mD = fi.metrics->maxDescent();
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int const h = mA + mD;
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pm = QPixmap(w, h);
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pm.fill(Qt::transparent);
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QLPainter p(&pm);
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p.setQPainterPen(f.realColor());
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if (p.font() != fi.font)
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p.setFont(fi.font);
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// We need to draw the text as LTR as we use our own bidi code.
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p.setLayoutDirection(Qt::LeftToRight);
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p.drawText(-lb, mA, str);
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QPixmapCache::insert(key, pm);
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LYXERR(Debug::PAINTING) << "h=" << h << " mA=" << mA << " mD=" << mD
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<< " w=" << w << " lb=" << lb << " tw=" << textwidth
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<< " rb=" << rb << endl;
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}
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// Draw the cached pixmap.
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drawPixmap(x + lb, y - mA, pm);
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return textwidth;
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}
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} // namespace frontend
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} // namespace lyx
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