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/****************************************************************************
**
** Copyright (C) 2012 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.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
** $QT_END_LICENSE$
**
****************************************************************************/
/*
screenwidget.cpp
A widget to display colour components from an image using independently
selected colors. Controls are provided to allow the image to be inverted, and
the color to be selection via a standard dialog. The image is displayed in a
label widget.
*/
#include <QApplication>
#include <QColorDialog>
#include <QGridLayout>
#include <QImage>
#include <QLabel>
#include <QMenu>
#include <QMimeData>
#include <QMouseEvent>
#include <QPixmap>
#include <QPushButton>
#include <QWidget>
#include "screenwidget.h"
/*!
Initializes the paint color, the mask color (cyan, magenta,
or yellow), connects the color selector and invert checkbox to functions,
and creates a two-by-two grid layout.
*/
ScreenWidget::ScreenWidget(QWidget *parent, QColor initialColor,
const QString &name, Separation mask,
const QSize &labelSize)
: QFrame(parent)
{
paintColor = initialColor;
maskColor = mask;
inverted = false;
imageLabel = new QLabel;
imageLabel->setFrameShadow(QFrame::Sunken);
imageLabel->setFrameShape(QFrame::StyledPanel);
imageLabel->setMinimumSize(labelSize);
nameLabel = new QLabel(name);
colorButton = new QPushButton(tr("Modify..."));
colorButton->setBackgroundRole(QPalette::Button);
colorButton->setMinimumSize(32, 32);
QPalette palette(colorButton->palette());
palette.setColor(QPalette::Button, initialColor);
colorButton->setPalette(palette);
invertButton = new QPushButton(tr("Invert"));
//invertButton->setToggleButton(true);
//invertButton->setOn(inverted);
invertButton->setEnabled(false);
connect(colorButton, SIGNAL(clicked()), this, SLOT(setColor()));
connect(invertButton, SIGNAL(clicked()), this, SLOT(invertImage()));
QGridLayout *gridLayout = new QGridLayout;
gridLayout->addWidget(imageLabel, 0, 0, 1, 2);
gridLayout->addWidget(nameLabel, 1, 0);
gridLayout->addWidget(colorButton, 1, 1);
gridLayout->addWidget(invertButton, 2, 1, 1, 1);
setLayout(gridLayout);
}
/*!
Creates a new image by separating out the cyan, magenta, or yellow
component, depending on the mask color specified in the constructor.
The amount of the component found in each pixel of the image is used
to determine how much of a user-selected ink is used for each pixel
in the new image for the label widget.
*/
void ScreenWidget::createImage()
{
newImage = originalImage.copy();
// Create CMY components for the ink being used.
float cyanInk = (255 - paintColor.red())/255.0;
float magentaInk = (255 - paintColor.green())/255.0;
float yellowInk = (255 - paintColor.blue())/255.0;
int (*convert)(QRgb);
switch (maskColor) {
case Cyan:
convert = qRed;
break;
case Magenta:
convert = qGreen;
break;
case Yellow:
convert = qBlue;
break;
}
for (int y = 0; y < newImage.height(); ++y) {
for (int x = 0; x < newImage.width(); ++x) {
QRgb p(originalImage.pixel(x, y));
// Separate the source pixel into its cyan component.
int amount;
if (inverted)
amount = convert(p);
else
amount = 255 - convert(p);
QColor newColor(
255 - qMin(int(amount * cyanInk), 255),
255 - qMin(int(amount * magentaInk), 255),
255 - qMin(int(amount * yellowInk), 255));
newImage.setPixel(x, y, newColor.rgb());
}
}
imageLabel->setPixmap(QPixmap::fromImage(newImage));
}
/*!
Returns a pointer to the modified image.
*/
QImage* ScreenWidget::image()
{
return &newImage;
}
/*!
Sets whether the amount of ink applied to the canvas is to be inverted
(subtracted from the maximum value) before the ink is applied.
*/
void ScreenWidget::invertImage()
{
//inverted = invertButton->isOn();
inverted = !inverted;
createImage();
emit imageChanged();
}
/*!
Separate the current image into cyan, magenta, and yellow components.
Create a representation of how each component might appear when applied
to a blank white piece of paper.
*/
void ScreenWidget::setColor()
{
QColor newColor = QColorDialog::getColor(paintColor);
if (newColor.isValid()) {
paintColor = newColor;
QPalette palette(colorButton->palette());
palette.setColor(QPalette::Button, paintColor);
colorButton->setPalette(palette);
createImage();
emit imageChanged();
}
}
/*!
Records the original image selected by the user, creates a color
separation, and enables the invert image checkbox.
*/
void ScreenWidget::setImage(QImage &image)
{
originalImage = image;
createImage();
invertButton->setEnabled(true);
}
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