Javi
112 lines
3.3 KiB
C++
112 lines
3.3 KiB
C++
/*
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* Copyright (C) 2015 ~ 2017 Deepin Technology Co., Ltd.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "graphicsgloweffect.h"
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#include <QDebug>
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DWIDGET_USE_NAMESPACE
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GraphicsGlowEffect::GraphicsGlowEffect(QObject *parent) :
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QGraphicsEffect(parent),
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m_xOffset(0),
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m_yOffset(0),
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m_distance(4.0f),
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m_blurRadius(10.0f),
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m_color(0, 0, 0, 80)
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{
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}
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QT_BEGIN_NAMESPACE
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extern Q_WIDGETS_EXPORT void qt_blurImage(QPainter *p, QImage &blurImage, qreal radius, bool quality, bool alphaOnly, int transposed = 0);
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QT_END_NAMESPACE
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void GraphicsGlowEffect::cachePixmap(const QPixmap &sourcePx)
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{
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// Calculate size for the background image
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QSize scaleSize(sourcePx.size().width() + 2 * distance(), sourcePx.size().height() + 2 * distance());
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if (cacheBlurPixmap.size() == scaleSize) {
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return;
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}
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QImage tmpImg(scaleSize, QImage::Format_ARGB32_Premultiplied);
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QPixmap scaled = sourcePx.scaled(scaleSize);
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tmpImg.fill(0);
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QPainter tmpPainter(&tmpImg);
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tmpPainter.setCompositionMode(QPainter::CompositionMode_Source);
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tmpPainter.drawPixmap(QPointF(-distance(), -distance()), scaled);
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tmpPainter.end();
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// blur the alpha channel
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QImage blurred(tmpImg.size(), QImage::Format_ARGB32_Premultiplied);
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blurred.fill(0);
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QPainter blurPainter(&blurred);
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qt_blurImage(&blurPainter, tmpImg, blurRadius(), false, true);
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blurPainter.end();
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tmpImg = blurred;
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// blacken the image...
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tmpPainter.begin(&tmpImg);
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tmpPainter.setCompositionMode(QPainter::CompositionMode_SourceIn);
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tmpPainter.fillRect(tmpImg.rect(), color());
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tmpPainter.end();
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cacheBlurPixmap = QPixmap::fromImage(tmpImg);
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}
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void GraphicsGlowEffect::draw(QPainter *painter)
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{
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// if nothing to show outside the item, just draw source
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if ((blurRadius() + distance()) <= 0) {
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drawSource(painter);
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return;
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}
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PixmapPadMode mode = QGraphicsEffect::PadToEffectiveBoundingRect;
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QPoint offset;
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const QPixmap sourcePx = sourcePixmap(Qt::DeviceCoordinates, &offset, mode);
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// return if no source
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if (sourcePx.isNull()) {
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return;
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}
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cachePixmap(sourcePx);
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// save world transform
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QTransform restoreTransform = painter->worldTransform();
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painter->setWorldTransform(QTransform());
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// draw the blurred shadow...
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painter->drawPixmap(offset, cacheBlurPixmap);
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// draw the actual pixmap...
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painter->drawPixmap(offset, sourcePx, QRectF());
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// restore world transform
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painter->setWorldTransform(restoreTransform);
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}
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QRectF GraphicsGlowEffect::boundingRectFor(const QRectF &rect) const
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{
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qreal delta = blurRadius() + distance();
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return rect.united(rect.adjusted(-delta - xOffset(), -delta - yOffset(), delta - xOffset(), delta - yOffset()));
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}
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