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/*
Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
Copyright (C) 2008 Holger Hans Peter Freyther
Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "Font.h"
#include "FontDescription.h"
#include "FontFallbackList.h"
#include "FontSelector.h"
#include "Gradient.h"
#include "GraphicsContext.h"
#include "Pattern.h"
#include "TransformationMatrix.h"
#include <QBrush>
#include <QFontInfo>
#include <QFontMetrics>
#include <QPainter>
#include <QPainterPath>
#include <QPen>
#include <QTextLayout>
#include <qalgorithms.h>
#include <qdebug.h>
#include <limits.h>
#if QT_VERSION >= 0x040400
namespace WebCore {
static const QString qstring(const TextRun& run)
{
// We don't detach
return QString::fromRawData(reinterpret_cast<const QChar*>(run.characters()), run.length());
}
static const QString fixSpacing(const QString &string)
{
//Only detach if we're actually changing something
QString possiblyDetached = string;
for (int i = 0; i < string.length(); ++i) {
const QChar c = string.at(i);
if (c.unicode() != 0x20 && Font::treatAsSpace(c.unicode()))
possiblyDetached[i] = 0x20; // detach
else if (c.unicode() != 0x200c && Font::treatAsZeroWidthSpace(c.unicode()))
possiblyDetached[i] = 0x200c; // detach
}
return possiblyDetached;
}
static QTextLine setupLayout(QTextLayout* layout, const TextRun& style)
{
int flags = style.rtl() ? Qt::TextForceRightToLeft : Qt::TextForceLeftToRight;
if (style.padding())
flags |= Qt::TextJustificationForced;
layout->setFlags(flags);
layout->beginLayout();
QTextLine line = layout->createLine();
line.setLineWidth(INT_MAX/256);
if (style.padding())
line.setLineWidth(line.naturalTextWidth() + style.padding());
layout->endLayout();
return line;
}
void Font::drawComplexText(GraphicsContext* ctx, const TextRun& run, const FloatPoint& point, int from, int to) const
{
if (to < 0)
to = run.length();
QPainter *p = ctx->platformContext();
if (ctx->textDrawingMode() & cTextFill) {
if (ctx->fillGradient()) {
QBrush brush(*ctx->fillGradient()->platformGradient());
brush.setTransform(ctx->fillGradient()->gradientSpaceTransform());
p->setPen(QPen(brush, 0));
} else if (ctx->fillPattern()) {
TransformationMatrix affine;
p->setPen(QPen(QBrush(ctx->fillPattern()->createPlatformPattern(affine)), 0));
} else
p->setPen(QColor(ctx->fillColor()));
}
if (ctx->textDrawingMode() & cTextStroke) {
if (ctx->strokeGradient()) {
QBrush brush(*ctx->strokeGradient()->platformGradient());
brush.setTransform(ctx->strokeGradient()->gradientSpaceTransform());
p->setPen(QPen(brush, ctx->strokeThickness()));
} else if (ctx->strokePattern()) {
TransformationMatrix affine;
p->setPen(QPen(QBrush(ctx->strokePattern()->createPlatformPattern(affine)), ctx->strokeThickness()));
} else
p->setPen(QPen(QColor(ctx->strokeColor()), ctx->strokeThickness()));
}
const QString string = fixSpacing(qstring(run));
// text shadow
IntSize shadowSize;
int shadowBlur;
Color shadowColor;
bool hasShadow = ctx->textDrawingMode() == cTextFill && ctx->getShadow(shadowSize, shadowBlur, shadowColor);
if (from > 0 || to < run.length()) {
QTextLayout layout(string, font());
QTextLine line = setupLayout(&layout, run);
float x1 = line.cursorToX(from);
float x2 = line.cursorToX(to);
if (x2 < x1)
qSwap(x1, x2);
QFontMetrics fm(font());
int ascent = fm.ascent();
QRectF clip(point.x() + x1, point.y() - ascent, x2 - x1, fm.height());
if (hasShadow) {
// TODO: when blur support is added, the clip will need to account
// for the blur radius
qreal dx1 = 0, dx2 = 0, dy1 = 0, dy2 = 0;
if (shadowSize.width() > 0)
dx2 = shadowSize.width();
else
dx1 = -shadowSize.width();
if (shadowSize.height() > 0)
dy2 = shadowSize.height();
else
dy1 = -shadowSize.height();
// expand the clip rect to include the text shadow as well
clip.adjust(dx1, dx2, dy1, dy2);
}
p->save();
p->setClipRect(clip.toRect());
QPointF pt(point.x(), point.y() - ascent);
if (hasShadow) {
p->save();
p->setPen(QColor(shadowColor));
p->translate(shadowSize.width(), shadowSize.height());
line.draw(p, pt);
p->restore();
}
line.draw(p, pt);
p->restore();
return;
}
p->setFont(font());
QPointF pt(point.x(), point.y());
int flags = run.rtl() ? Qt::TextForceRightToLeft : Qt::TextForceLeftToRight;
if (hasShadow) {
// TODO: text shadow blur support
p->save();
p->setPen(QColor(shadowColor));
p->translate(shadowSize.width(), shadowSize.height());
p->drawText(pt, string, flags, run.padding());
p->restore();
}
if (ctx->textDrawingMode() & cTextStroke) {
QPainterPath path;
path.addText(pt, font(), string);
p->strokePath(path, p->pen());
}
if (ctx->textDrawingMode() & cTextFill)
p->drawText(pt, string, flags, run.padding());
}
float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>*) const
{
if (!run.length())
return 0;
const QString string = fixSpacing(qstring(run));
QTextLayout layout(string, font());
QTextLine line = setupLayout(&layout, run);
int w = int(line.naturalTextWidth());
// WebKit expects us to ignore word spacing on the first character (as opposed to what Qt does)
if (treatAsSpace(run[0]))
w -= m_wordSpacing;
return w + run.padding();
}
int Font::offsetForPositionForComplexText(const TextRun& run, int position, bool includePartialGlyphs) const
{
const QString string = fixSpacing(qstring(run));
QTextLayout layout(string, font());
QTextLine line = setupLayout(&layout, run);
return line.xToCursor(position);
}
FloatRect Font::selectionRectForComplexText(const TextRun& run, const IntPoint& pt, int h, int from, int to) const
{
const QString string = fixSpacing(qstring(run));
QTextLayout layout(string, font());
QTextLine line = setupLayout(&layout, run);
float x1 = line.cursorToX(from);
float x2 = line.cursorToX(to);
if (x2 < x1)
qSwap(x1, x2);
return FloatRect(pt.x() + x1, pt.y(), x2 - x1, h);
}
QFont Font::font() const
{
return primaryFont()->getQtFont();
}
}
#endif
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