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Correct text and shadow composition to accomodate negative offsets.

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svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=827890
This commit is contained in:
Andrew Lake 2008-07-04 03:55:14 +00:00
parent 922c85c705
commit c6897f66ae
1 changed files with 28 additions and 9 deletions
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37
paintutils.cpp
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@ -47,13 +47,11 @@ void shadowBlur(QImage &image, int radius, const QColor &color)
QPixmap shadowText(QString text, QColor textColor, QColor shadowColor, QPoint offset, int radius)
{
// Draw text
QPixmap pixmap(10,10);
QPainter p(&pixmap);
QRect textRect = p.fontMetrics().boundingRect(text);
p.end();
QFontMetrics fm(text);
QRect textRect = fm.boundingRect(text);
QPixmap textPixmap(textRect.size());
textPixmap.fill(Qt::transparent);
p.begin(&textPixmap);
QPainter p(&textPixmap);
p.setPen(textColor);
p.drawText(textPixmap.rect(), Qt::AlignLeft, text);
p.end();
@ -63,16 +61,37 @@ QPixmap shadowText(QString text, QColor textColor, QColor shadowColor, QPoint of
QImage::Format_ARGB32_Premultiplied);
img.fill(Qt::transparent);
p.begin(&img);
p.drawImage(QPoint(0,0), textPixmap.toImage());
p.drawImage(QPoint(radius,radius), textPixmap.toImage());
p.end();
shadowBlur(img, radius, shadowColor);
//Compose text and shadow
QPixmap finalPixmap(img.size() + QSize(offset.x(), offset.y()));
int addSizeX;
int addSizeY;
if (offset.x() > radius) {
addSizeX = abs(offset.x()) - radius;
} else {
addSizeX = 0;
}
if (offset.y() > radius) {
addSizeY = abs(offset.y()) - radius;
} else {
addSizeY = 0;
}
QPixmap finalPixmap(img.size() + QSize(addSizeX, addSizeY));
finalPixmap.fill(Qt::transparent);
p.begin(&finalPixmap);
p.drawImage(finalPixmap.rect().topLeft() + QPoint(offset.x(), offset.y()), img);
p.drawPixmap(finalPixmap.rect().topLeft(), textPixmap);
QPointF offsetF(offset);
QPointF textTopLeft(finalPixmap.rect().topLeft() +
QPointF ((finalPixmap.width() - textPixmap.width()) / 2.0, (finalPixmap.height() - textPixmap.height()) / 2.0) -
(offsetF / 2.0));
QPointF shadowTopLeft(finalPixmap.rect().topLeft() +
QPointF ((finalPixmap.width() - img.width()) / 2.0, (finalPixmap.height() - img.height()) / 2.0) +
(offsetF / 2.0));
p.drawImage(shadowTopLeft, img);
p.drawPixmap(textTopLeft, textPixmap);
p.end();
return finalPixmap;