qpixmap_raster.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 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 GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
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** sales department at [e-mail].
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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****************************************************************************/

#include "qpixmap.h"
#include "qpixmap_p.h"

#include "qbitmap.h"
#include "qimage.h"
#include "qwidget.h"
#include "qpainter.h"
#include "qdatastream.h"
#include "qbuffer.h"
#include "qapplication.h"
#include <private/qinternal_p.h>
#include <private/qwidget_p.h>
#include "qevent.h"
#include "qfile.h"
#include "qfileinfo.h"
#include "qdatetime.h"
#include "qpixmapcache.h"
#include "qimagereader.h"
#include "qimagewriter.h"
#include "qdebug.h"

typedef void (*_qt_pixmap_cleanup_hook)(int);
Q_GUI_EXPORT _qt_pixmap_cleanup_hook qt_pixmap_cleanup_hook = 0;
Q_GUI_EXPORT qint64 qt_pixmap_id(const QPixmap &pixmap)
{
    return (((qint64) pixmap.data->image.serialNumber()) << 32) | ((qint64) pixmap.data->detach_no);
}

QPixmap::QPixmap()
    : QPaintDevice()
{
    init(0, 0);
}

#ifdef QT3_SUPPORT
QPixmap::QPixmap(const QImage& image)
    : QPaintDevice()
{
    init(0, 0);
    *this = fromImage(image);
}
#endif
QPixmap::QPixmap(int w, int h)
    : QPaintDevice()
{
    init(w, h);
}

QPixmap::QPixmap(const QSize &size)
    : QPaintDevice()
{
    init(size.width(), size.height());
}

QPixmap::QPixmap(const QSize &size, enum QPixmap::Type type)
    : QPaintDevice()
{
    init(size.width(), size.height(), type);
}

QPixmap::QPixmap(const QString& fileName, const char *format, Qt::ImageConversionFlags flags)
    : QPaintDevice()
{
    init(0, 0);
    load(fileName, format, flags);
}

QPixmap::QPixmap(const QPixmap &pixmap)
    : QPaintDevice()
{
    if (pixmap.paintingActive()) {                // make a deep copy
        data = 0;
        operator=(pixmap.copy());
    } else {
        data = pixmap.data;
        data->ref();
    }
}

#ifndef QT_NO_IMAGEFORMAT_XPM
QPixmap::QPixmap(const char * const xpm[])
    : QPaintDevice()
{
    init(0, 0);

    QImage image(xpm);
    if (!image.isNull())
        (*this) = fromImage(image);
}
#endif // QT_NO_IMAGEFORMAT_XPM

QPixmap::~QPixmap()
{
    deref();
}

int QPixmap::devType() const
{
    return QInternal::Pixmap;
}

QPixmap &QPixmap::operator=(const QPixmap &pixmap)
{
    if (paintingActive()) {
        qWarning("QPixmap::operator=: Cannot assign to pixmap during painting");
        return *this;
    }
    if (pixmap.paintingActive()) {                // make a deep copy
        *this = pixmap.copy();
    } else {
        pixmap.data->ref();                                // avoid 'x = x'
        deref();
        data = pixmap.data;
    }
    return *this;
}
#ifdef QT3_SUPPORT
QPixmap &QPixmap::operator=(const QImage &image)
{
    (*this) = fromImage(image);
    return *this;
}
#endif
QPixmap::operator QVariant() const
{
    return QVariant(QVariant::Pixmap, this);
}

bool QPixmap::isNull() const
{
    return data->image.isNull();
}

int QPixmap::width() const
{
    return data->image.width();
}

int QPixmap::height() const
{
    return data->image.height();
}

QSize QPixmap::size() const
{
    return data->image.size();
}

QRect QPixmap::rect() const
{
    return data->image.rect();
}

int QPixmap::depth() const
{
    return data->image.depth();
}

int QPixmap::defaultDepth()
{
    return 32; //###
}

void QPixmap::fill(const QColor &fillColor)
{
    uint pixel;
    detach();
    if (data->image.depth() == 1) {
        int gray = qGray(fillColor.rgba());
        // Pick the best approximate color in the image's colortable.
        if (qAbs(qGray(data->image.color(0)) - gray) < qAbs(qGray(data->image.color(1)) - gray)) {
            pixel = 0;
        } else {
            pixel = 1;
        }
    } else if (data->image.depth() == 32
#ifdef Q_WS_QWS
               || data->image.depth() == 16
#endif
        ) {
        int alpha = fillColor.alpha();
        if (alpha != 255) {
            if (data->image.format() == QImage::Format_RGB32
#ifdef Q_WS_QWS
                || data->image.format() == QImage::Format_RGB16
#endif
                )
                data->image = data->image.convertToFormat(QImage::Format_ARGB32_Premultiplied);
            // Premultiply pixel value.
            pixel = qRgba(fillColor.red() * alpha / 255,
                          fillColor.green() * alpha / 255,
                          fillColor.blue() * alpha / 255,
                          alpha);
        } else {
            pixel = fillColor.rgba();
        }

    } else {
        pixel = 0;
        // ### what about 8 bits
    }

    data->image.fill(pixel);
}
#ifdef QT3_SUPPORT
void QPixmap::resize_helper(const QSize &size)
{
    if (size == data->image.size())
        return;
    detach();

    if (size.isEmpty())
        data->image = QImage();
    else if (data->image.isNull())
        *this = QPixmap(size, data->type);
    else
        data->image = data->image.copy(0, 0, size.width(), size.height());
}
#endif

const uchar qt_pixmap_bit_mask[] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 };


QBitmap QPixmap::mask() const
{
    if (!data->image.hasAlphaChannel() || data->image.depth() != 32) {
        return QBitmap();
    }

    // Create image and setup color table
    int w = data->image.width();
    int h = data->image.height();
    QImage mask = data->createBitmapImage(w, h);
    int bpl = mask.bytesPerLine();

    // copy over the data
    for (int y=0; y<h; ++y) {
        QRgb *src = (QRgb *) data->image.scanLine(y);
        uchar *dest = mask.scanLine(y);
        memset(dest, 0, bpl);
        for (int x=0; x<w; ++x) {
            if (qAlpha(*src) > 0)
                dest[x>>3] |= qt_pixmap_bit_mask[x&7];
            ++src;
        }
    }

    return QBitmap::fromImage(mask);
}

void QPixmap::setMask(const QBitmap &mask)
{
    if (mask.size().isEmpty()) {
        if (depth() != 1) {
            detach();
            data->image = data->image.convertToFormat(QImage::Format_RGB32);
        }

    } else if (mask.size() != size()) {
        qWarning("QPixmap::setMask() mask size differs from pixmap size");

    } else {
        detach();
        const QImage imageMask = mask.toImage().convertToFormat(QImage::Format_MonoLSB);

        int w = width();
        int h = height();

        switch (depth()) {

        case 1:
            for (int y=0; y<h; ++y) {
                const uchar *mscan = imageMask.scanLine(y);
                uchar *tscan = data->image.scanLine(y);
                int bytesPerLine = data->image.bytesPerLine();
                for (int i=0; i<bytesPerLine; ++i)
                    tscan[i] &= mscan[i];
            }
            break;

        case 32:
            data->image = data->image.convertToFormat(QImage::Format_ARGB32_Premultiplied);
            for (int y=0; y<h; ++y) {
                const uchar *mscan = imageMask.scanLine(y);
                QRgb *tscan = (QRgb *) data->image.scanLine(y);
                for (int x=0; x<w; ++x) {
                    if (!(mscan[x>>3] & qt_pixmap_bit_mask[x&7]))
                        tscan[x] = 0;
                }
            }
            break;
        }
    }
}

bool QPixmap::hasAlpha() const
{
    return data->image.hasAlphaChannel();
}

bool QPixmap::hasAlphaChannel() const
{
    return data->image.hasAlphaChannel();
}