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plasma: assume QPixmap paint engines support composition

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the backbone of QPixmap is QImage

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
This commit is contained in:
Ivailo Monev 2024-04-19 20:31:07 +03:00
parent 2ad07c5a86
commit 174f6a30e0
1 changed files with 19 additions and 48 deletions
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67
plasma/paintutils.cpp
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@ -215,60 +215,31 @@ QPixmap transition(const QPixmap &from, const QPixmap &to, qreal amount)
targetRect.moveCenter(toRect.center()); targetRect.moveCenter(toRect.center());
startRect.moveCenter(toRect.center()); startRect.moveCenter(toRect.center());
//paint to in the center of from, skipping setAlphaF() // paint to in the center of from, skipping setAlphaF()
QColor color(0, 0, 0, amount); QColor color(0, 0, 0, amount);
// If the native paint engine supports Porter/Duff compositing and CompositionMode_Plus QPixmap startPixmap(pixmapSize);
QPaintEngine *paintEngine = from.paintEngine(); startPixmap.fill(Qt::transparent);
if (paintEngine &&
paintEngine->hasFeature(QPaintEngine::PorterDuff) &&
paintEngine->hasFeature(QPaintEngine::BlendModes)) {
QPixmap startPixmap(pixmapSize);
startPixmap.fill(Qt::transparent);
QPixmap targetPixmap(pixmapSize); QPixmap targetPixmap(pixmapSize);
targetPixmap.fill(Qt::transparent); targetPixmap.fill(Qt::transparent);
QPainter p; QPainter p;
p.begin(&targetPixmap); p.begin(&targetPixmap);
p.drawPixmap(targetRect, to); p.drawPixmap(targetRect, to);
p.setCompositionMode(QPainter::CompositionMode_DestinationIn); p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
p.fillRect(targetRect, color); p.fillRect(targetRect, color);
p.end(); p.end();
p.begin(&startPixmap); p.begin(&startPixmap);
p.drawPixmap(startRect, from); p.drawPixmap(startRect, from);
p.setCompositionMode(QPainter::CompositionMode_DestinationOut); p.setCompositionMode(QPainter::CompositionMode_DestinationOut);
p.fillRect(startRect, color); p.fillRect(startRect, color);
p.setCompositionMode(QPainter::CompositionMode_Plus); p.setCompositionMode(QPainter::CompositionMode_Plus);
p.drawPixmap(targetRect, targetPixmap); p.drawPixmap(targetRect, targetPixmap);
p.end(); p.end();
return startPixmap; return startPixmap;
} else {
// Fall back to using QRasterPaintEngine to do the transition.
QImage under(pixmapSize, QImage::Format_ARGB32_Premultiplied);
under.fill(Qt::transparent);
QImage over(pixmapSize, QImage::Format_ARGB32_Premultiplied);
over.fill(Qt::transparent);
QPainter p;
p.begin(&over);
p.drawPixmap(targetRect, to);
p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
p.fillRect(over.rect(), color);
p.end();
p.begin(&under);
p.drawPixmap(startRect, from);
p.setCompositionMode(QPainter::CompositionMode_DestinationOut);
p.fillRect(startRect, color);
p.setCompositionMode(QPainter::CompositionMode_Plus);
p.drawImage(toRect.topLeft(), over);
p.end();
return QPixmap::fromImage(under);
}
} }
} // PaintUtils namespace } // PaintUtils namespace