242 lines
8.2 KiB
C++
242 lines
8.2 KiB
C++
/*
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* Copyright 2005 by Aaron Seigo <aseigo@kde.org>
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* Copyright 2008 by Andrew Lake <jamboarder@yahoo.com>
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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 Library General Public License as
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* published by the Free Software Foundation; either version 2, or
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* (at your option) 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 Library General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <paintutils.h>
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#include <QImage>
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#include <QPainter>
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#include <QPaintEngine>
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#include <QPixmap>
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#include "effects/blur.cpp"
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namespace Plasma
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{
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namespace PaintUtils
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{
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void shadowBlur(QImage &image, int radius, const QColor &color)
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{
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if (radius < 1) {
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return;
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}
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expblur<16, 7>(image, radius);
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QPainter p(&image);
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p.setCompositionMode(QPainter::CompositionMode_SourceIn);
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p.fillRect(image.rect(), color);
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p.end();
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}
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//TODO: we should have shadowText methods that paint the results directly into a QPainter passed in
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QPixmap shadowText(QString text, QColor textColor, QColor shadowColor, QPoint offset, int radius)
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{
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return shadowText(text, qApp->font(), textColor, shadowColor, offset, radius);
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}
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QPixmap shadowText(QString text, const QFont &font, QColor textColor, QColor shadowColor, QPoint offset, int radius)
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{
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//don't try to paint stuff on a future null pixmap because the text is empty
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if (text.isEmpty()) {
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return QPixmap();
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}
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// Draw text
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QFontMetrics fm(font);
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QRect textRect = fm.boundingRect(text);
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QPixmap textPixmap(textRect.width(), fm.height());
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textPixmap.fill(Qt::transparent);
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QPainter p(&textPixmap);
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p.setPen(textColor);
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p.setFont(font);
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p.drawText(textPixmap.rect(), Qt::AlignLeft, text);
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p.end();
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//Draw blurred shadow
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QImage img(textRect.size() + QSize(radius * 2, radius * 2),
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QImage::Format_ARGB32_Premultiplied);
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img.fill(Qt::transparent);
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p.begin(&img);
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p.drawImage(QPoint(radius, radius), textPixmap.toImage());
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p.end();
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shadowBlur(img, radius, shadowColor);
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//Compose text and shadow
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int addSizeX;
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int addSizeY;
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if (offset.x() > radius) {
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addSizeX = abs(offset.x()) - radius;
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} else {
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addSizeX = 0;
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}
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if (offset.y() > radius) {
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addSizeY = abs(offset.y()) - radius;
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} else {
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addSizeY = 0;
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}
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QPixmap finalPixmap(img.size() + QSize(addSizeX, addSizeY));
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finalPixmap.fill(Qt::transparent);
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p.begin(&finalPixmap);
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QPointF offsetF(offset);
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QPointF textTopLeft(finalPixmap.rect().topLeft() +
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QPointF ((finalPixmap.width() - textPixmap.width()) / 2.0, (finalPixmap.height() - textPixmap.height()) / 2.0) -
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(offsetF / 2.0));
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QPointF shadowTopLeft(finalPixmap.rect().topLeft() +
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QPointF ((finalPixmap.width() - img.width()) / 2.0, (finalPixmap.height() - img.height()) / 2.0) +
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(offsetF / 2.0));
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p.drawImage(shadowTopLeft, img);
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p.drawPixmap(textTopLeft, textPixmap);
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p.end();
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return finalPixmap;
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}
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QPainterPath roundedRectangle(const QRectF &rect, qreal radius)
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{
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QPainterPath path(QPointF(rect.left(), rect.top() + radius));
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path.quadTo(rect.left(), rect.top(), rect.left() + radius, rect.top()); // Top left corner
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path.lineTo(rect.right() - radius, rect.top()); // Top side
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path.quadTo(rect.right(), rect.top(), rect.right(), rect.top() + radius); // Top right corner
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path.lineTo(rect.right(), rect.bottom() - radius); // Right side
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path.quadTo(rect.right(), rect.bottom(), rect.right() - radius, rect.bottom()); // Bottom right corner
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path.lineTo(rect.left() + radius, rect.bottom()); // Bottom side
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path.quadTo(rect.left(), rect.bottom(), rect.left(), rect.bottom() - radius); // Bottom left corner
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path.closeSubpath();
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return path;
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}
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QPixmap transition(const QPixmap &from, const QPixmap &to, qreal amount)
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{
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int value = int(0xff * amount);
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if (value == 0) {
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return from;
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} else if (value == 1) {
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return to;
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}
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QColor color;
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color.setAlphaF(amount);
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//paint to in the center of from
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QRect toRect = to.rect();
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toRect.moveCenter(from.rect().center());
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// If the native paint engine supports Porter/Duff compositing and CompositionMode_Plus
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if (from.paintEngine()->hasFeature(QPaintEngine::PorterDuff) &&
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from.paintEngine()->hasFeature(QPaintEngine::BlendModes)) {
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QPixmap under = from;
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QPixmap over = to;
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QPainter p;
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p.begin(&over);
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p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
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p.fillRect(over.rect(), color);
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p.end();
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p.begin(&under);
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p.setCompositionMode(QPainter::CompositionMode_DestinationOut);
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p.fillRect(under.rect(), color);
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p.setCompositionMode(QPainter::CompositionMode_Plus);
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p.drawPixmap(toRect.topLeft(), over);
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p.end();
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return under;
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}
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#if defined(Q_WS_X11) && defined(HAVE_XRENDER)
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// We have Xrender support
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else if (from.paintEngine()->hasFeature(QPaintEngine::PorterDuff)) {
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// QX11PaintEngine doesn't implement CompositionMode_Plus in Qt 4.3,
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// which we need to be able to do a transition from one pixmap to
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// another.
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//
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// In order to avoid the overhead of converting the pixmaps to images
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// and doing the operation entirely in software, this function has a
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// specialized path for X11 that uses Xrender directly to do the
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// transition. This operation can be fully accelerated in HW.
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//
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// This specialization can be removed when QX11PaintEngine supports
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// CompositionMode_Plus.
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QPixmap source(to), destination(from);
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source.detach();
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destination.detach();
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Display *dpy = QX11Info::display();
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XRenderPictFormat *format = XRenderFindStandardFormat(dpy, PictStandardA8);
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XRenderPictureAttributes pa;
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pa.repeat = 1; // RepeatNormal
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// Create a 1x1 8 bit repeating alpha picture
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Pixmap pixmap = XCreatePixmap(dpy, destination.handle(), 1, 1, 8);
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Picture alpha = XRenderCreatePicture(dpy, pixmap, format, CPRepeat, &pa);
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XFreePixmap(dpy, pixmap);
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// Fill the alpha picture with the opacity value
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XRenderColor xcolor;
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xcolor.alpha = quint16(0xffff * amount);
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XRenderFillRectangle(dpy, PictOpSrc, alpha, &xcolor, 0, 0, 1, 1);
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// Reduce the alpha of the destination with 1 - opacity
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XRenderComposite(dpy, PictOpOutReverse, alpha, None, destination.x11PictureHandle(),
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0, 0, 0, 0, 0, 0, destination.width(), destination.height());
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// Add source * opacity to the destination
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XRenderComposite(dpy, PictOpAdd, source.x11PictureHandle(), alpha,
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destination.x11PictureHandle(),
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toRect.x(), toRect.y(), 0, 0, 0, 0, destination.width(), destination.height());
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XRenderFreePicture(dpy, alpha);
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return destination;
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}
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#endif
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else {
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// Fall back to using QRasterPaintEngine to do the transition.
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QImage under = from.toImage();
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QImage over = to.toImage();
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QPainter p;
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p.begin(&over);
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p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
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p.fillRect(over.rect(), color);
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p.end();
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p.begin(&under);
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p.setCompositionMode(QPainter::CompositionMode_DestinationOut);
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p.fillRect(under.rect(), color);
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p.setCompositionMode(QPainter::CompositionMode_Plus);
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p.drawImage(toRect.topLeft(), over);
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p.end();
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return QPixmap::fromImage(under);
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}
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}
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} // PaintUtils namespace
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} // Plasma namespace
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