C++/Qt/QImage — различия между версиями
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Версия 14:21, 25 мая 2010
Содержание
Check image format and scan line
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtGui>
int main()
{
int x, y;
{
QImage image;
if (image.format() == QImage::Format_MonoLSB)
image.scanLine(y)[x >> 3] |= 1 << (x & 7);
else
image.scanLine(y)[x >> 3] |= 1 << (7 - (x & 7));
}
}
Image composer
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef IMAGECOMPOSER_H
#define IMAGECOMPOSER_H
#include <QPainter>
#include <QWidget>
QT_BEGIN_NAMESPACE
class QComboBox;
class QLabel;
class QToolButton;
QT_END_NAMESPACE
class ImageComposer : public QWidget
{
Q_OBJECT
public:
ImageComposer();
private slots:
void chooseSource();
void chooseDestination();
void recalculateResult();
private:
void addOp(QPainter::CompositionMode mode, const QString &name);
void chooseImage(const QString &title, QImage *image, QToolButton *button);
void loadImage(const QString &fileName, QImage *image, QToolButton *button);
QPainter::CompositionMode currentMode() const;
QPoint imagePos(const QImage &image) const;
QToolButton *sourceButton;
QToolButton *destinationButton;
QComboBox *operatorComboBox;
QLabel *equalLabel;
QLabel *resultLabel;
QImage sourceImage;
QImage destinationImage;
QImage resultImage;
};
#endif
#include <QtGui>
#include "imagecomposer.h"
static const QSize resultSize(200, 200);
ImageComposer::ImageComposer()
{
sourceButton = new QToolButton;
sourceButton->setIconSize(resultSize);
operatorComboBox = new QComboBox;
addOp(QPainter::CompositionMode_SourceOver, tr("SourceOver"));
addOp(QPainter::CompositionMode_DestinationOver, tr("DestinationOver"));
addOp(QPainter::CompositionMode_Clear, tr("Clear"));
addOp(QPainter::CompositionMode_Source, tr("Source"));
addOp(QPainter::CompositionMode_Destination, tr("Destination"));
addOp(QPainter::CompositionMode_SourceIn, tr("SourceIn"));
addOp(QPainter::CompositionMode_DestinationIn, tr("DestinationIn"));
addOp(QPainter::CompositionMode_SourceOut, tr("SourceOut"));
addOp(QPainter::CompositionMode_DestinationOut, tr("DestinationOut"));
addOp(QPainter::CompositionMode_SourceAtop, tr("SourceAtop"));
addOp(QPainter::CompositionMode_DestinationAtop, tr("DestinationAtop"));
addOp(QPainter::CompositionMode_Xor, tr("Xor"));
addOp(QPainter::CompositionMode_Plus, tr("Plus"));
addOp(QPainter::CompositionMode_Multiply, tr("Multiply"));
addOp(QPainter::CompositionMode_Screen, tr("Screen"));
addOp(QPainter::CompositionMode_Overlay, tr("Overlay"));
addOp(QPainter::CompositionMode_Darken, tr("Darken"));
addOp(QPainter::CompositionMode_Lighten, tr("Lighten"));
addOp(QPainter::CompositionMode_ColorDodge, tr("ColorDodge"));
addOp(QPainter::CompositionMode_ColorBurn, tr("ColorBurn"));
addOp(QPainter::CompositionMode_HardLight, tr("HardLight"));
addOp(QPainter::CompositionMode_SoftLight, tr("SoftLight"));
addOp(QPainter::CompositionMode_Difference, tr("Difference"));
addOp(QPainter::CompositionMode_Exclusion, tr("Exclusion"));
destinationButton = new QToolButton;
destinationButton->setIconSize(resultSize);
equalLabel = new QLabel(tr("="));
resultLabel = new QLabel;
resultLabel->setMinimumWidth(resultSize.width());
connect(sourceButton, SIGNAL(clicked()), this, SLOT(chooseSource()));
connect(operatorComboBox, SIGNAL(activated(int)),
this, SLOT(recalculateResult()));
connect(destinationButton, SIGNAL(clicked()),
this, SLOT(chooseDestination()));
QGridLayout *mainLayout = new QGridLayout;
mainLayout->addWidget(sourceButton, 0, 0, 3, 1);
mainLayout->addWidget(operatorComboBox, 1, 1);
mainLayout->addWidget(destinationButton, 0, 2, 3, 1);
mainLayout->addWidget(equalLabel, 1, 3);
mainLayout->addWidget(resultLabel, 0, 4, 3, 1);
mainLayout->setSizeConstraint(QLayout::SetFixedSize);
setLayout(mainLayout);
resultImage = QImage(resultSize, QImage::Format_ARGB32_Premultiplied);
loadImage(":/images/butterfly.png", &sourceImage, sourceButton);
loadImage(":/images/checker.png", &destinationImage, destinationButton);
setWindowTitle(tr("Image Composition"));
}
void ImageComposer::chooseSource()
{
chooseImage(tr("Choose Source Image"), &sourceImage, sourceButton);
}
void ImageComposer::chooseDestination()
{
chooseImage(tr("Choose Destination Image"), &destinationImage,
destinationButton);
}
void ImageComposer::recalculateResult()
{
QPainter::CompositionMode mode = currentMode();
QPainter painter(&resultImage);
painter.setCompositionMode(QPainter::CompositionMode_Source);
painter.fillRect(resultImage.rect(), Qt::transparent);
painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
painter.drawImage(0, 0, destinationImage);
painter.setCompositionMode(mode);
painter.drawImage(0, 0, sourceImage);
painter.setCompositionMode(QPainter::CompositionMode_DestinationOver);
painter.fillRect(resultImage.rect(), Qt::white);
painter.end();
resultLabel->setPixmap(QPixmap::fromImage(resultImage));
}
void ImageComposer::addOp(QPainter::CompositionMode mode, const QString &name)
{
operatorComboBox->addItem(name, mode);
}
void ImageComposer::chooseImage(const QString &title, QImage *image,
QToolButton *button)
{
QString fileName = QFileDialog::getOpenFileName(this, title);
if (!fileName.isEmpty())
loadImage(fileName, image, button);
}
void ImageComposer::loadImage(const QString &fileName, QImage *image,
QToolButton *button)
{
image->load(fileName);
QImage fixedImage(resultSize, QImage::Format_ARGB32_Premultiplied);
QPainter painter(&fixedImage);
painter.setCompositionMode(QPainter::CompositionMode_Source);
painter.fillRect(fixedImage.rect(), Qt::transparent);
painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
painter.drawImage(imagePos(*image), *image);
painter.end();
button->setIcon(QPixmap::fromImage(fixedImage));
*image = fixedImage;
recalculateResult();
}
QPainter::CompositionMode ImageComposer::currentMode() const
{
return (QPainter::CompositionMode)
operatorComboBox->itemData(operatorComboBox->currentIndex()).toInt();
}
QPoint ImageComposer::imagePos(const QImage &image) const
{
return QPoint((resultSize.width() - image.width()) / 2,
(resultSize.height() - image.height()) / 2);
}
#include <QApplication>
#include "imagecomposer.h"
int main(int argc, char *argv[])
{
Q_INIT_RESOURCE(imagecomposition);
QApplication app(argc, argv);
ImageComposer composer;
composer.show();
return app.exec();
}
Set entry 19 in the color table to yellow
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtGui>
int main()
{
int x, y;
{
// 8-BIT ACCESS
QImage image;
// set entry 19 in the color table to yellow
image.setColor(19, qRgb(255, 255, 0));
// set 8 bit pixel at (x,y) to value yellow (in color table)
image.scanLine(y)[x] = 19;
}
}
Sets 32 bit pixel at (x,y) to yellow
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtGui>
int main()
{
int x, y;
{
// 32-BIT
QImage image;
// sets 32 bit pixel at (x,y) to yellow.
uint *ptr = reinterpret_cast<uint *>(image.scanLine(y)) + x;
*ptr = qRgb(255, 255, 0);
}
}
svg text object
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef SVGTEXTOBJECT_H
#define SVGTEXTOBJECT_H
#include <QTextObjectInterface>
QT_BEGIN_NAMESPACE
class QTextDocument;
class QTextFormat;
class QPainter;
class QRectF;
class QSizeF;
QT_END_NAMESPACE
class SvgTextObject : public QObject, public QTextObjectInterface
{
Q_OBJECT
Q_INTERFACES(QTextObjectInterface)
public:
QSizeF intrinsicSize(QTextDocument *doc, int posInDocument,
const QTextFormat &format);
void drawObject(QPainter *painter, const QRectF &rect, QTextDocument *doc,
int posInDocument, const QTextFormat &format);
};
#endif
#include <QtGui>
#include <QtSvg>
#include "svgtextobject.h"
#include "window.h"
QSizeF SvgTextObject::intrinsicSize(QTextDocument *doc, int posInDocument,
const QTextFormat &format)
{
QImage bufferedImage = qVariantValue<QImage>(format.property(Window::SvgData));
QSize size = bufferedImage.size();
if (size.height() > 25)
size *= 25.0 / (double) size.height();
return QSizeF(size);
}
void SvgTextObject::drawObject(QPainter *painter, const QRectF &rect,
QTextDocument *doc, int posInDocument,
const QTextFormat &format)
{
QImage bufferedImage = qVariantValue<QImage>(format.property(Window::SvgData));
painter->drawImage(rect, bufferedImage);
}
#ifndef WINDOW_H
#define WINDOW_H
#include <QWidget>
#include <QTextFormat>
QT_BEGIN_NAMESPACE
class QTextEdit;
class QLineEdit;
class QPushButton;
class QLabel;
QT_END_NAMESPACE
class Window : public QWidget
{
Q_OBJECT
public:
enum { SvgTextFormat = QTextFormat::UserObject + 1 };
enum SvgProperties { SvgData = 1 };
Window();
private slots:
void insertTextObject();
private:
void setupTextObject();
void setupGui();
private:
QTextEdit *textEdit;
QLabel *fileNameLabel;
QLineEdit *fileNameLineEdit;
QPushButton *insertTextObjectButton;
};
#endif
#include <QtGui>
#include <QtSvg>
#include "window.h"
#include "svgtextobject.h"
Window::Window()
{
setupGui();
setupTextObject();
setWindowTitle("Text Object Example");
}
void Window::insertTextObject()
{
QString fileName = fileNameLineEdit->text();
QFile file(fileName);
if (!file.open(QIODevice::ReadOnly)) {
QMessageBox::warning(this, tr("Error Opening File"),
tr("Could not open "%1"").arg(fileName));
}
QByteArray svgData = file.readAll();
QTextCharFormat svgCharFormat;
svgCharFormat.setObjectType(SvgTextFormat);
QSvgRenderer renderer(svgData);
QImage svgBufferImage(renderer.defaultSize(), QImage::Format_ARGB32);
QPainter painter(&svgBufferImage);
renderer.render(&painter, svgBufferImage.rect());
svgCharFormat.setProperty(SvgData, svgBufferImage);
QTextCursor cursor = textEdit->textCursor();
cursor.insertText(QString(QChar::ObjectReplacementCharacter), svgCharFormat);
textEdit->setTextCursor(cursor);
}
void Window::setupTextObject()
{
QObject *svgInterface = new SvgTextObject;
textEdit->document()->documentLayout()->registerHandler(SvgTextFormat, svgInterface);
}
void Window::setupGui()
{
fileNameLabel = new QLabel(tr("Svg File Name:"));
fileNameLineEdit = new QLineEdit;
insertTextObjectButton = new QPushButton(tr("Insert Image"));
fileNameLineEdit->setText("./files/heart.svg");
connect(insertTextObjectButton, SIGNAL(clicked()),
this, SLOT(insertTextObject()));
QHBoxLayout *bottomLayout = new QHBoxLayout;
bottomLayout->addWidget(fileNameLabel);
bottomLayout->addWidget(fileNameLineEdit);
bottomLayout->addWidget(insertTextObjectButton);
textEdit = new QTextEdit;
QVBoxLayout *mainLayout = new QVBoxLayout;
mainLayout->addWidget(textEdit);
mainLayout->addLayout(bottomLayout);
setLayout(mainLayout);
}
#include <QtGui>
#include "window.h"
int main(int argv, char **args)
{
QApplication app(argv, args);
Window window;
window.show();
return app.exec();
}
Writes image into ba in PNG format
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtGui>
int main()
{
int x, y;
{
QImage image;
QByteArray ba;
QBuffer buffer(&ba);
buffer.open(QIODevice::WriteOnly);
image.save(&buffer, "PNG"); // writes image into ba in PNG format
}
}