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877 lines
28 KiB
C++
877 lines
28 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the QtGui module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see http://www.qt.io/terms-conditions. For further
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** information use the contact form at http://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** As a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qbmphandler_p.h"
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#ifndef QT_NO_IMAGEFORMAT_BMP
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#include <qimage.h>
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#include <qvariant.h>
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#include <qvector.h>
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QT_BEGIN_NAMESPACE
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static void swapPixel01(QImage *image) // 1-bpp: swap 0 and 1 pixels
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{
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int i;
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if (image->depth() == 1 && image->colorCount() == 2) {
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uint *p = (uint *)image->bits();
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int nbytes = image->byteCount();
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for (i=0; i<nbytes/4; i++) {
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*p = ~*p;
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p++;
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}
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uchar *p2 = (uchar *)p;
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for (i=0; i<(nbytes&3); i++) {
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*p2 = ~*p2;
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p2++;
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}
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QRgb t = image->color(0); // swap color 0 and 1
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image->setColor(0, image->color(1));
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image->setColor(1, t);
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}
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}
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/*
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QImageIO::defineIOHandler("BMP", "^BM", 0,
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read_bmp_image, write_bmp_image);
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*/
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/*****************************************************************************
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BMP (DIB) image read/write functions
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*****************************************************************************/
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const int BMP_FILEHDR_SIZE = 14; // size of BMP_FILEHDR data
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static QDataStream &operator>>(QDataStream &s, BMP_FILEHDR &bf)
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{ // read file header
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s.readRawData(bf.bfType, 2);
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s >> bf.bfSize >> bf.bfReserved1 >> bf.bfReserved2 >> bf.bfOffBits;
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return s;
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}
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static QDataStream &operator<<(QDataStream &s, const BMP_FILEHDR &bf)
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{ // write file header
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s.writeRawData(bf.bfType, 2);
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s << bf.bfSize << bf.bfReserved1 << bf.bfReserved2 << bf.bfOffBits;
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return s;
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}
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const int BMP_OLD = 12; // old Windows/OS2 BMP size
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const int BMP_WIN = 40; // Windows BMP v3 size
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const int BMP_OS2 = 64; // new OS/2 BMP size
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const int BMP_WIN4 = 108; // Windows BMP v4 size
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const int BMP_WIN5 = 124; // Windows BMP v5 size
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const int BMP_RGB = 0; // no compression
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const int BMP_RLE8 = 1; // run-length encoded, 8 bits
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const int BMP_RLE4 = 2; // run-length encoded, 4 bits
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const int BMP_BITFIELDS = 3; // RGB values encoded in data as bit-fields
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static QDataStream &operator>>(QDataStream &s, BMP_INFOHDR &bi)
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{
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s >> bi.biSize;
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if (bi.biSize == BMP_WIN || bi.biSize == BMP_OS2 || bi.biSize == BMP_WIN4 || bi.biSize == BMP_WIN5) {
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s >> bi.biWidth >> bi.biHeight >> bi.biPlanes >> bi.biBitCount;
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s >> bi.biCompression >> bi.biSizeImage;
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s >> bi.biXPelsPerMeter >> bi.biYPelsPerMeter;
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s >> bi.biClrUsed >> bi.biClrImportant;
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}
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else { // probably old Windows format
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qint16 w, h;
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s >> w >> h >> bi.biPlanes >> bi.biBitCount;
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bi.biWidth = w;
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bi.biHeight = h;
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bi.biCompression = BMP_RGB; // no compression
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bi.biSizeImage = 0;
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bi.biXPelsPerMeter = bi.biYPelsPerMeter = 0;
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bi.biClrUsed = bi.biClrImportant = 0;
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}
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return s;
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}
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static QDataStream &operator<<(QDataStream &s, const BMP_INFOHDR &bi)
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{
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s << bi.biSize;
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s << bi.biWidth << bi.biHeight;
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s << bi.biPlanes;
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s << bi.biBitCount;
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s << bi.biCompression;
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s << bi.biSizeImage;
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s << bi.biXPelsPerMeter << bi.biYPelsPerMeter;
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s << bi.biClrUsed << bi.biClrImportant;
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return s;
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}
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static int calc_shift(uint mask)
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{
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int result = 0;
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while (mask && !(mask & 1)) {
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result++;
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mask >>= 1;
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}
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return result;
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}
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static bool read_dib_fileheader(QDataStream &s, BMP_FILEHDR &bf)
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{
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// read BMP file header
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s >> bf;
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if (s.status() != QDataStream::Ok)
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return false;
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// check header
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if (qstrncmp(bf.bfType,"BM",2) != 0)
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return false;
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return true;
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}
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static bool read_dib_infoheader(QDataStream &s, BMP_INFOHDR &bi)
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{
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s >> bi; // read BMP info header
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if (s.status() != QDataStream::Ok)
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return false;
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int nbits = bi.biBitCount;
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int comp = bi.biCompression;
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if (!(nbits == 1 || nbits == 4 || nbits == 8 || nbits == 16 || nbits == 24 || nbits == 32) ||
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bi.biPlanes != 1 || comp > BMP_BITFIELDS)
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return false; // weird BMP image
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if (!(comp == BMP_RGB || (nbits == 4 && comp == BMP_RLE4) ||
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(nbits == 8 && comp == BMP_RLE8) || ((nbits == 16 || nbits == 32) && comp == BMP_BITFIELDS)))
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return false; // weird compression type
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return true;
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}
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static bool read_dib_body(QDataStream &s, const BMP_INFOHDR &bi, int offset, int startpos, QImage &image)
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{
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QIODevice* d = s.device();
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if (d->atEnd()) // end of stream/file
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return false;
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#if 0
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qDebug("offset...........%d", offset);
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qDebug("startpos.........%d", startpos);
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qDebug("biSize...........%d", bi.biSize);
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qDebug("biWidth..........%d", bi.biWidth);
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qDebug("biHeight.........%d", bi.biHeight);
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qDebug("biPlanes.........%d", bi.biPlanes);
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qDebug("biBitCount.......%d", bi.biBitCount);
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qDebug("biCompression....%d", bi.biCompression);
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qDebug("biSizeImage......%d", bi.biSizeImage);
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qDebug("biXPelsPerMeter..%d", bi.biXPelsPerMeter);
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qDebug("biYPelsPerMeter..%d", bi.biYPelsPerMeter);
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qDebug("biClrUsed........%d", bi.biClrUsed);
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qDebug("biClrImportant...%d", bi.biClrImportant);
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#endif
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int w = bi.biWidth, h = bi.biHeight, nbits = bi.biBitCount;
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int t = bi.biSize, comp = bi.biCompression;
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uint red_mask = 0;
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uint green_mask = 0;
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uint blue_mask = 0;
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int red_shift = 0;
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int green_shift = 0;
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int blue_shift = 0;
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int red_scale = 0;
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int green_scale = 0;
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int blue_scale = 0;
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int ncols = 0;
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int depth = 0;
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QImage::Format format;
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switch (nbits) {
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case 32:
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case 24:
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case 16:
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depth = 32;
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format = QImage::Format_RGB32;
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break;
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case 8:
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case 4:
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depth = 8;
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format = QImage::Format_Indexed8;
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break;
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default:
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depth = 1;
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format = QImage::Format_Mono;
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}
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if (bi.biHeight < 0)
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h = -h; // support images with negative height
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if (image.size() != QSize(w, h) || image.format() != format) {
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image = QImage(w, h, format);
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if (image.isNull()) // could not create image
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return false;
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}
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if (depth != 32) {
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ncols = bi.biClrUsed ? bi.biClrUsed : 1 << nbits;
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if (ncols > 256) // sanity check - don't run out of mem if color table is broken
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return false;
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image.setColorCount(ncols);
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}
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image.setDotsPerMeterX(bi.biXPelsPerMeter);
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image.setDotsPerMeterY(bi.biYPelsPerMeter);
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if (!d->isSequential())
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d->seek(startpos + BMP_FILEHDR_SIZE + (bi.biSize >= BMP_WIN4? BMP_WIN : bi.biSize)); // goto start of colormap
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if (bi.biSize >= BMP_WIN4 || (comp == BMP_BITFIELDS && (nbits == 16 || nbits == 32))) {
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if (d->read((char *)&red_mask, sizeof(red_mask)) != sizeof(red_mask))
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return false;
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if (d->read((char *)&green_mask, sizeof(green_mask)) != sizeof(green_mask))
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return false;
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if (d->read((char *)&blue_mask, sizeof(blue_mask)) != sizeof(blue_mask))
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return false;
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// Read BMP v4+ header
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if (bi.biSize >= BMP_WIN4) {
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int alpha_mask = 0;
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int CSType = 0;
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int gamma_red = 0;
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int gamma_green = 0;
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int gamma_blue = 0;
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int endpoints[9];
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if (d->read((char *)&alpha_mask, sizeof(alpha_mask)) != sizeof(alpha_mask))
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return false;
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if (d->read((char *)&CSType, sizeof(CSType)) != sizeof(CSType))
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return false;
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if (d->read((char *)&endpoints, sizeof(endpoints)) != sizeof(endpoints))
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return false;
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if (d->read((char *)&gamma_red, sizeof(gamma_red)) != sizeof(gamma_red))
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return false;
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if (d->read((char *)&gamma_green, sizeof(gamma_green)) != sizeof(gamma_green))
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return false;
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if (d->read((char *)&gamma_blue, sizeof(gamma_blue)) != sizeof(gamma_blue))
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return false;
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if (bi.biSize == BMP_WIN5) {
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qint32 intent = 0;
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qint32 profileData = 0;
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qint32 profileSize = 0;
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qint32 reserved = 0;
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if (d->read((char *)&intent, sizeof(intent)) != sizeof(intent))
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return false;
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if (d->read((char *)&profileData, sizeof(profileData)) != sizeof(profileData))
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return false;
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if (d->read((char *)&profileSize, sizeof(profileSize)) != sizeof(profileSize))
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return false;
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if (d->read((char *)&reserved, sizeof(reserved)) != sizeof(reserved) || reserved != 0)
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return false;
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}
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}
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}
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if (ncols > 0) { // read color table
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uchar rgb[4];
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int rgb_len = t == BMP_OLD ? 3 : 4;
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for (int i=0; i<ncols; i++) {
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if (d->read((char *)rgb, rgb_len) != rgb_len)
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return false;
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image.setColor(i, qRgb(rgb[2],rgb[1],rgb[0]));
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if (d->atEnd()) // truncated file
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return false;
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}
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} else if (comp == BMP_BITFIELDS && (nbits == 16 || nbits == 32)) {
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red_shift = calc_shift(red_mask);
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if (((red_mask >> red_shift) + 1) == 0)
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return false;
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red_scale = 256 / ((red_mask >> red_shift) + 1);
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green_shift = calc_shift(green_mask);
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if (((green_mask >> green_shift) + 1) == 0)
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return false;
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green_scale = 256 / ((green_mask >> green_shift) + 1);
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blue_shift = calc_shift(blue_mask);
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if (((blue_mask >> blue_shift) + 1) == 0)
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return false;
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blue_scale = 256 / ((blue_mask >> blue_shift) + 1);
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} else if (comp == BMP_RGB && (nbits == 24 || nbits == 32)) {
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blue_mask = 0x000000ff;
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green_mask = 0x0000ff00;
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red_mask = 0x00ff0000;
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blue_shift = 0;
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green_shift = 8;
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red_shift = 16;
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blue_scale = green_scale = red_scale = 1;
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} else if (comp == BMP_RGB && nbits == 16) {
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blue_mask = 0x001f;
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green_mask = 0x03e0;
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red_mask = 0x7c00;
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blue_shift = 0;
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green_shift = 2;
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red_shift = 7;
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red_scale = 1;
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green_scale = 1;
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blue_scale = 8;
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}
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// offset can be bogus, be careful
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if (offset>=0 && startpos + offset > d->pos()) {
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if (!d->isSequential())
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d->seek(startpos + offset); // start of image data
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}
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int bpl = image.bytesPerLine();
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uchar *data = image.bits();
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if (nbits == 1) { // 1 bit BMP image
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while (--h >= 0) {
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if (d->read((char*)(data + h*bpl), bpl) != bpl)
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break;
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}
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if (ncols == 2 && qGray(image.color(0)) < qGray(image.color(1)))
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swapPixel01(&image); // pixel 0 is white!
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}
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else if (nbits == 4) { // 4 bit BMP image
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int buflen = ((w+7)/8)*4;
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uchar *buf = new uchar[buflen];
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if (comp == BMP_RLE4) { // run length compression
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int x=0, y=0, c, i;
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quint8 b;
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uchar *p = data + (h-1)*bpl;
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const uchar *endp = p + w;
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while (y < h) {
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if (!d->getChar((char *)&b))
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break;
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if (b == 0) { // escape code
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if (!d->getChar((char *)&b) || b == 1) {
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y = h; // exit loop
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} else switch (b) {
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case 0: // end of line
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x = 0;
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y++;
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p = data + (h-y-1)*bpl;
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break;
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case 2: // delta (jump)
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{
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quint8 tmp;
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d->getChar((char *)&tmp);
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x += tmp;
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d->getChar((char *)&tmp);
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y += tmp;
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}
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// Protection
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if ((uint)x >= (uint)w)
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x = w-1;
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if ((uint)y >= (uint)h)
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y = h-1;
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p = data + (h-y-1)*bpl + x;
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break;
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default: // absolute mode
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// Protection
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if (p + b > endp)
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b = endp-p;
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i = (c = b)/2;
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while (i--) {
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d->getChar((char *)&b);
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*p++ = b >> 4;
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*p++ = b & 0x0f;
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}
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if (c & 1) {
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unsigned char tmp;
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d->getChar((char *)&tmp);
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*p++ = tmp >> 4;
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}
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if ((((c & 3) + 1) & 2) == 2)
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d->getChar(0); // align on word boundary
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x += c;
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}
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} else { // encoded mode
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// Protection
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if (p + b > endp)
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b = endp-p;
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i = (c = b)/2;
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d->getChar((char *)&b); // 2 pixels to be repeated
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while (i--) {
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*p++ = b >> 4;
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*p++ = b & 0x0f;
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}
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if (c & 1)
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*p++ = b >> 4;
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x += c;
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}
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}
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} else if (comp == BMP_RGB) { // no compression
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memset(data, 0, h*bpl);
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while (--h >= 0) {
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if (d->read((char*)buf,buflen) != buflen)
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break;
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uchar *p = data + h*bpl;
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uchar *b = buf;
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for (int i=0; i<w/2; i++) { // convert nibbles to bytes
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*p++ = *b >> 4;
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*p++ = *b++ & 0x0f;
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}
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if (w & 1) // the last nibble
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*p = *b >> 4;
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}
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}
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delete [] buf;
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}
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else if (nbits == 8) { // 8 bit BMP image
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if (comp == BMP_RLE8) { // run length compression
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int x=0, y=0;
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quint8 b;
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uchar *p = data + (h-1)*bpl;
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const uchar *endp = p + w;
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while (y < h) {
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if (!d->getChar((char *)&b))
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break;
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if (b == 0) { // escape code
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if (!d->getChar((char *)&b) || b == 1) {
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y = h; // exit loop
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} else switch (b) {
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case 0: // end of line
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x = 0;
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y++;
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p = data + (h-y-1)*bpl;
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break;
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case 2: // delta (jump)
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{
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quint8 tmp;
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d->getChar((char *)&tmp);
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x += tmp;
|
|
d->getChar((char *)&tmp);
|
|
y += tmp;
|
|
}
|
|
|
|
// Protection
|
|
if ((uint)x >= (uint)w)
|
|
x = w-1;
|
|
if ((uint)y >= (uint)h)
|
|
y = h-1;
|
|
|
|
p = data + (h-y-1)*bpl + x;
|
|
break;
|
|
default: // absolute mode
|
|
// Protection
|
|
if (p + b > endp)
|
|
b = endp-p;
|
|
|
|
if (d->read((char *)p, b) != b)
|
|
return false;
|
|
if ((b & 1) == 1)
|
|
d->getChar(0); // align on word boundary
|
|
x += b;
|
|
p += b;
|
|
}
|
|
} else { // encoded mode
|
|
// Protection
|
|
if (p + b > endp)
|
|
b = endp-p;
|
|
|
|
char tmp;
|
|
d->getChar(&tmp);
|
|
memset(p, tmp, b); // repeat pixel
|
|
x += b;
|
|
p += b;
|
|
}
|
|
}
|
|
} else if (comp == BMP_RGB) { // uncompressed
|
|
while (--h >= 0) {
|
|
if (d->read((char *)data + h*bpl, bpl) != bpl)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
else if (nbits == 16 || nbits == 24 || nbits == 32) { // 16,24,32 bit BMP image
|
|
QRgb *p;
|
|
QRgb *end;
|
|
uchar *buf24 = new uchar[bpl];
|
|
int bpl24 = ((w*nbits+31)/32)*4;
|
|
uchar *b;
|
|
int c;
|
|
|
|
while (--h >= 0) {
|
|
p = (QRgb *)(data + h*bpl);
|
|
end = p + w;
|
|
if (d->read((char *)buf24,bpl24) != bpl24)
|
|
break;
|
|
b = buf24;
|
|
while (p < end) {
|
|
c = *(uchar*)b | (*(uchar*)(b+1)<<8);
|
|
if (nbits != 16)
|
|
c |= *(uchar*)(b+2)<<16;
|
|
*p++ = qRgb(((c & red_mask) >> red_shift) * red_scale,
|
|
((c & green_mask) >> green_shift) * green_scale,
|
|
((c & blue_mask) >> blue_shift) * blue_scale);
|
|
b += nbits/8;
|
|
}
|
|
}
|
|
delete[] buf24;
|
|
}
|
|
|
|
if (bi.biHeight < 0) {
|
|
// Flip the image
|
|
uchar *buf = new uchar[bpl];
|
|
h = -bi.biHeight;
|
|
for (int y = 0; y < h/2; ++y) {
|
|
memcpy(buf, data + y*bpl, bpl);
|
|
memcpy(data + y*bpl, data + (h-y-1)*bpl, bpl);
|
|
memcpy(data + (h-y-1)*bpl, buf, bpl);
|
|
}
|
|
delete [] buf;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// this is also used in qmime_win.cpp
|
|
bool qt_write_dib(QDataStream &s, QImage image)
|
|
{
|
|
int nbits;
|
|
int bpl_bmp;
|
|
int bpl = image.bytesPerLine();
|
|
|
|
QIODevice* d = s.device();
|
|
if (!d->isWritable())
|
|
return false;
|
|
|
|
if (image.depth() == 8 && image.colorCount() <= 16) {
|
|
bpl_bmp = (((bpl+1)/2+3)/4)*4;
|
|
nbits = 4;
|
|
} else if (image.depth() == 32) {
|
|
bpl_bmp = ((image.width()*24+31)/32)*4;
|
|
nbits = 24;
|
|
} else {
|
|
bpl_bmp = bpl;
|
|
nbits = image.depth();
|
|
}
|
|
|
|
BMP_INFOHDR bi;
|
|
bi.biSize = BMP_WIN; // build info header
|
|
bi.biWidth = image.width();
|
|
bi.biHeight = image.height();
|
|
bi.biPlanes = 1;
|
|
bi.biBitCount = nbits;
|
|
bi.biCompression = BMP_RGB;
|
|
bi.biSizeImage = bpl_bmp*image.height();
|
|
bi.biXPelsPerMeter = image.dotsPerMeterX() ? image.dotsPerMeterX()
|
|
: 2834; // 72 dpi default
|
|
bi.biYPelsPerMeter = image.dotsPerMeterY() ? image.dotsPerMeterY() : 2834;
|
|
bi.biClrUsed = image.colorCount();
|
|
bi.biClrImportant = image.colorCount();
|
|
s << bi; // write info header
|
|
if (s.status() != QDataStream::Ok)
|
|
return false;
|
|
|
|
if (image.depth() != 32) { // write color table
|
|
uchar *color_table = new uchar[4*image.colorCount()];
|
|
uchar *rgb = color_table;
|
|
QVector<QRgb> c = image.colorTable();
|
|
for (int i=0; i<image.colorCount(); i++) {
|
|
*rgb++ = qBlue (c[i]);
|
|
*rgb++ = qGreen(c[i]);
|
|
*rgb++ = qRed (c[i]);
|
|
*rgb++ = 0;
|
|
}
|
|
if (d->write((char *)color_table, 4*image.colorCount()) == -1) {
|
|
delete [] color_table;
|
|
return false;
|
|
}
|
|
delete [] color_table;
|
|
}
|
|
|
|
if (image.format() == QImage::Format_MonoLSB)
|
|
image = image.convertToFormat(QImage::Format_Mono);
|
|
|
|
int y;
|
|
|
|
if (nbits == 1 || nbits == 8) { // direct output
|
|
for (y=image.height()-1; y>=0; y--) {
|
|
if (d->write((char*)image.scanLine(y), bpl) == -1)
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
uchar *buf = new uchar[bpl_bmp];
|
|
uchar *b, *end;
|
|
register uchar *p;
|
|
|
|
memset(buf, 0, bpl_bmp);
|
|
for (y=image.height()-1; y>=0; y--) { // write the image bits
|
|
if (nbits == 4) { // convert 8 -> 4 bits
|
|
p = image.scanLine(y);
|
|
b = buf;
|
|
end = b + image.width()/2;
|
|
while (b < end) {
|
|
*b++ = (*p << 4) | (*(p+1) & 0x0f);
|
|
p += 2;
|
|
}
|
|
if (image.width() & 1)
|
|
*b = *p << 4;
|
|
} else { // 32 bits
|
|
QRgb *p = (QRgb *)image.scanLine(y);
|
|
QRgb *end = p + image.width();
|
|
b = buf;
|
|
while (p < end) {
|
|
*b++ = qBlue(*p);
|
|
*b++ = qGreen(*p);
|
|
*b++ = qRed(*p);
|
|
p++;
|
|
}
|
|
}
|
|
if (bpl_bmp != d->write((char*)buf, bpl_bmp)) {
|
|
delete[] buf;
|
|
return false;
|
|
}
|
|
}
|
|
delete[] buf;
|
|
return true;
|
|
}
|
|
|
|
// this is also used in qmime_win.cpp
|
|
bool qt_read_dib(QDataStream &s, QImage &image)
|
|
{
|
|
BMP_INFOHDR bi;
|
|
if (!read_dib_infoheader(s, bi))
|
|
return false;
|
|
return read_dib_body(s, bi, -1, -BMP_FILEHDR_SIZE, image);
|
|
}
|
|
|
|
QBmpHandler::QBmpHandler()
|
|
: state(Ready)
|
|
{
|
|
}
|
|
|
|
bool QBmpHandler::readHeader()
|
|
{
|
|
state = Error;
|
|
|
|
QIODevice *d = device();
|
|
QDataStream s(d);
|
|
startpos = d->pos();
|
|
|
|
// Intel byte order
|
|
s.setByteOrder(QDataStream::LittleEndian);
|
|
|
|
// read BMP file header
|
|
if (!read_dib_fileheader(s, fileHeader))
|
|
return false;
|
|
|
|
// read BMP info header
|
|
if (!read_dib_infoheader(s, infoHeader))
|
|
return false;
|
|
|
|
state = ReadHeader;
|
|
return true;
|
|
}
|
|
|
|
bool QBmpHandler::canRead() const
|
|
{
|
|
if (state == Ready && !canRead(device()))
|
|
return false;
|
|
|
|
if (state != Error) {
|
|
setFormat("bmp");
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool QBmpHandler::canRead(QIODevice *device)
|
|
{
|
|
if (!device) {
|
|
qWarning("QBmpHandler::canRead() called with 0 pointer");
|
|
return false;
|
|
}
|
|
|
|
char head[2];
|
|
if (device->peek(head, sizeof(head)) != sizeof(head))
|
|
return false;
|
|
|
|
return (qstrncmp(head, "BM", 2) == 0);
|
|
}
|
|
|
|
bool QBmpHandler::read(QImage *image)
|
|
{
|
|
if (state == Error)
|
|
return false;
|
|
|
|
if (!image) {
|
|
qWarning("QBmpHandler::read: cannot read into null pointer");
|
|
return false;
|
|
}
|
|
|
|
if (state == Ready && !readHeader()) {
|
|
state = Error;
|
|
return false;
|
|
}
|
|
|
|
QIODevice *d = device();
|
|
QDataStream s(d);
|
|
|
|
// Intel byte order
|
|
s.setByteOrder(QDataStream::LittleEndian);
|
|
|
|
// read image
|
|
if (!read_dib_body(s, infoHeader, fileHeader.bfOffBits, startpos, *image))
|
|
return false;
|
|
|
|
state = Ready;
|
|
return true;
|
|
}
|
|
|
|
bool QBmpHandler::write(const QImage &img)
|
|
{
|
|
QImage image;
|
|
switch (img.format()) {
|
|
case QImage::Format_ARGB8565_Premultiplied:
|
|
case QImage::Format_ARGB8555_Premultiplied:
|
|
case QImage::Format_ARGB6666_Premultiplied:
|
|
case QImage::Format_ARGB4444_Premultiplied:
|
|
image = img.convertToFormat(QImage::Format_ARGB32);
|
|
break;
|
|
case QImage::Format_RGB16:
|
|
case QImage::Format_RGB888:
|
|
case QImage::Format_RGB666:
|
|
case QImage::Format_RGB555:
|
|
case QImage::Format_RGB444:
|
|
image = img.convertToFormat(QImage::Format_RGB32);
|
|
break;
|
|
default:
|
|
image = img;
|
|
}
|
|
|
|
QIODevice *d = device();
|
|
QDataStream s(d);
|
|
BMP_FILEHDR bf;
|
|
int bpl_bmp;
|
|
int bpl = image.bytesPerLine();
|
|
|
|
// Code partially repeated in qt_write_dib
|
|
if (image.depth() == 8 && image.colorCount() <= 16) {
|
|
bpl_bmp = (((bpl+1)/2+3)/4)*4;
|
|
} else if (image.depth() == 32) {
|
|
bpl_bmp = ((image.width()*24+31)/32)*4;
|
|
} else {
|
|
bpl_bmp = bpl;
|
|
}
|
|
|
|
// Intel byte order
|
|
s.setByteOrder(QDataStream::LittleEndian);
|
|
|
|
// build file header
|
|
memcpy(bf.bfType, "BM", 2);
|
|
|
|
// write file header
|
|
bf.bfReserved1 = 0;
|
|
bf.bfReserved2 = 0;
|
|
bf.bfOffBits = BMP_FILEHDR_SIZE + BMP_WIN + image.colorCount() * 4;
|
|
bf.bfSize = bf.bfOffBits + bpl_bmp*image.height();
|
|
s << bf;
|
|
|
|
// write image
|
|
return qt_write_dib(s, image);
|
|
}
|
|
|
|
bool QBmpHandler::supportsOption(ImageOption option) const
|
|
{
|
|
return option == Size
|
|
|| option == ImageFormat;
|
|
}
|
|
|
|
QVariant QBmpHandler::option(ImageOption option) const
|
|
{
|
|
if (option == Size) {
|
|
if (state == Error)
|
|
return QVariant();
|
|
if (state == Ready && !const_cast<QBmpHandler*>(this)->readHeader())
|
|
return QVariant();
|
|
return QSize(infoHeader.biWidth, infoHeader.biHeight);
|
|
} else if (option == ImageFormat) {
|
|
if (state == Error)
|
|
return QVariant();
|
|
if (state == Ready && !const_cast<QBmpHandler*>(this)->readHeader())
|
|
return QVariant();
|
|
QImage::Format format;
|
|
switch (infoHeader.biBitCount) {
|
|
case 32:
|
|
case 24:
|
|
case 16:
|
|
format = QImage::Format_RGB32;
|
|
break;
|
|
case 8:
|
|
case 4:
|
|
format = QImage::Format_Indexed8;
|
|
break;
|
|
default:
|
|
format = QImage::Format_Mono;
|
|
}
|
|
return format;
|
|
}
|
|
return QVariant();
|
|
}
|
|
|
|
void QBmpHandler::setOption(ImageOption option, const QVariant &value)
|
|
{
|
|
Q_UNUSED(option);
|
|
Q_UNUSED(value);
|
|
}
|
|
|
|
QByteArray QBmpHandler::name() const
|
|
{
|
|
return "bmp";
|
|
}
|
|
|
|
QT_END_NAMESPACE
|
|
|
|
#endif // QT_NO_IMAGEFORMAT_BMP
|
|
|
|
|
|
|
|
|