/* * Copyright 2005 by Aaron Seigo * Copyright 2008 by Andrew Lake * * This program 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, or * (at your option) any later version. * * This program 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 General Public License for more details * * You should have received a copy of the GNU Library General Public * License along with this program; if not, write to the * Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #include #include #include #include #include #include "effects/blur.cpp" namespace Plasma { namespace PaintUtils { void shadowBlur(QImage &image, int radius, const QColor &color) { if (radius < 1) { return; } if (image.isNull()) { return; } expblur<16, 7>(image, radius); QPainter p(&image); p.setCompositionMode(QPainter::CompositionMode_SourceIn); p.fillRect(image.rect(), color); p.end(); } //TODO: we should have shadowText methods that paint the results directly into a QPainter passed in QPixmap shadowText(QString text, QColor textColor, QColor shadowColor, QPoint offset, int radius) { return shadowText(text, qApp->font(), textColor, shadowColor, offset, radius); } QPixmap shadowText(QString text, const QFont &font, QColor textColor, QColor shadowColor, QPoint offset, int radius) { //don't try to paint stuff on a future null pixmap because the text is empty if (text.isEmpty()) { return QPixmap(); } // Draw text QFontMetrics fm(font); QRect textRect = fm.boundingRect(text); QPixmap textPixmap(textRect.width(), fm.height()); textPixmap.fill(Qt::transparent); QPainter p(&textPixmap); p.setPen(textColor); p.setFont(font); // FIXME: the center alignment here is odd: the rect should be the size needed by // the text, but for some fonts and configurations this is off by a pixel or so // and "centering" the text painting 'fixes' that. Need to research why // this is the case and determine if we should be painting it differently here, // doing soething different with the boundingRect call or if it's a problem // in Qt itself p.drawText(textPixmap.rect(), Qt::AlignCenter, text); p.end(); //Draw blurred shadow QImage img(textRect.size() + QSize(radius * 2, radius * 2), QImage::Format_ARGB32_Premultiplied); img.fill(0); p.begin(&img); p.drawImage(QPoint(radius, radius), textPixmap.toImage()); p.end(); shadowBlur(img, radius, shadowColor); //Compose text and shadow 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); 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; } QPainterPath roundedRectangle(const QRectF &rect, qreal radius) { QPainterPath path(QPointF(rect.left(), rect.top() + radius)); path.quadTo(rect.left(), rect.top(), rect.left() + radius, rect.top()); // Top left corner path.lineTo(rect.right() - radius, rect.top()); // Top side path.quadTo(rect.right(), rect.top(), rect.right(), rect.top() + radius); // Top right corner path.lineTo(rect.right(), rect.bottom() - radius); // Right side path.quadTo(rect.right(), rect.bottom(), rect.right() - radius, rect.bottom()); // Bottom right corner path.lineTo(rect.left() + radius, rect.bottom()); // Bottom side path.quadTo(rect.left(), rect.bottom(), rect.left(), rect.bottom() - radius); // Bottom left corner path.closeSubpath(); return path; } QPixmap transition(const QPixmap &from, const QPixmap &to, qreal amount) { if (from.isNull() || to.isNull()) { return from; } int value = int(0xff * amount); if (value == 0) { return from; } else if (value == 1) { return to; } QColor color; color.setAlphaF(amount); //paint to in the center of from QRect toRect = to.rect(); toRect.moveCenter(from.rect().center()); // If the native paint engine supports Porter/Duff compositing and CompositionMode_Plus if (from.paintEngine()->hasFeature(QPaintEngine::PorterDuff) && from.paintEngine()->hasFeature(QPaintEngine::BlendModes)) { QPixmap under = from; QPixmap over = to; QPainter p; p.begin(&over); p.setCompositionMode(QPainter::CompositionMode_DestinationIn); p.fillRect(over.rect(), color); p.end(); p.begin(&under); p.setCompositionMode(QPainter::CompositionMode_DestinationOut); p.fillRect(under.rect(), color); p.setCompositionMode(QPainter::CompositionMode_Plus); p.drawPixmap(toRect.topLeft(), over); p.end(); return under; } #if defined(Q_WS_X11) && defined(HAVE_XRENDER) // We have Xrender support else if (from.paintEngine()->hasFeature(QPaintEngine::PorterDuff)) { // QX11PaintEngine doesn't implement CompositionMode_Plus in Qt 4.3, // which we need to be able to do a transition from one pixmap to // another. // // In order to avoid the overhead of converting the pixmaps to images // and doing the operation entirely in software, this function has a // specialized path for X11 that uses Xrender directly to do the // transition. This operation can be fully accelerated in HW. // // This specialization can be removed when QX11PaintEngine supports // CompositionMode_Plus. QPixmap source(to), destination(from); source.detach(); destination.detach(); Display *dpy = QX11Info::display(); XRenderPictFormat *format = XRenderFindStandardFormat(dpy, PictStandardA8); XRenderPictureAttributes pa; pa.repeat = 1; // RepeatNormal // Create a 1x1 8 bit repeating alpha picture Pixmap pixmap = XCreatePixmap(dpy, destination.handle(), 1, 1, 8); Picture alpha = XRenderCreatePicture(dpy, pixmap, format, CPRepeat, &pa); XFreePixmap(dpy, pixmap); // Fill the alpha picture with the opacity value XRenderColor xcolor; xcolor.alpha = quint16(0xffff * amount); XRenderFillRectangle(dpy, PictOpSrc, alpha, &xcolor, 0, 0, 1, 1); // Reduce the alpha of the destination with 1 - opacity XRenderComposite(dpy, PictOpOutReverse, alpha, None, destination.x11PictureHandle(), 0, 0, 0, 0, 0, 0, destination.width(), destination.height()); // Add source * opacity to the destination XRenderComposite(dpy, PictOpAdd, source.x11PictureHandle(), alpha, destination.x11PictureHandle(), toRect.x(), toRect.y(), 0, 0, 0, 0, destination.width(), destination.height()); XRenderFreePicture(dpy, alpha); return destination; } #endif else { // Fall back to using QRasterPaintEngine to do the transition. QImage under = from.toImage(); QImage over = to.toImage(); QPainter p; p.begin(&over); p.setCompositionMode(QPainter::CompositionMode_DestinationIn); p.fillRect(over.rect(), color); p.end(); p.begin(&under); p.setCompositionMode(QPainter::CompositionMode_DestinationOut); p.fillRect(under.rect(), color); p.setCompositionMode(QPainter::CompositionMode_Plus); p.drawImage(toRect.topLeft(), over); p.end(); return QPixmap::fromImage(under); } } } // PaintUtils namespace } // Plasma namespace