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/**************************************************************************** |
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** |
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). |
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** All rights reserved. |
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** Contact: Nokia Corporation (qt-info@nokia.com) |
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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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** No Commercial Usage |
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** This file contains pre-release code and may not be distributed. |
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** You may use this file in accordance with the terms and conditions |
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** contained in the Technology Preview License Agreement accompanying |
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** this package. |
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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 as published by the Free Software |
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** Foundation and appearing in the file LICENSE.LGPL included in the |
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** packaging of this file. Please review the following information to |
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** ensure the GNU Lesser General Public License version 2.1 requirements |
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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** |
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** In addition, as a special exception, Nokia gives you certain additional |
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** rights. These rights are described in the Nokia Qt 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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** If you have questions regarding the use of this file, please contact |
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** Nokia at qt-info@nokia.com. |
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** |
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** |
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** |
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** |
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** |
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** |
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** |
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** |
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** $QT_END_LICENSE$ |
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** |
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****************************************************************************/ |
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|
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#include "private/qppmhandler_p.h" |
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|
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#ifndef QT_NO_IMAGEFORMAT_PPM |
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|
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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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#include <ctype.h> |
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|
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QT_BEGIN_NAMESPACE |
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|
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/***************************************************************************** |
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PBM/PGM/PPM (ASCII and RAW) image read/write functions |
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*****************************************************************************/ |
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|
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static int read_pbm_int(QIODevice *d) |
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{ |
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char c; |
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int val = -1; |
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bool digit; |
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const int buflen = 100; |
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char buf[buflen]; |
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for (;;) { |
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if (!d->getChar(&c)) // end of file |
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break; |
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digit = isdigit((uchar) c); |
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if (val != -1) { |
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if (digit) { |
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val = 10*val + c - '0'; |
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continue; |
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} else { |
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if (c == '#') // comment |
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d->readLine(buf, buflen); |
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break; |
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} |
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} |
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if (digit) // first digit |
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val = c - '0'; |
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else if (isspace((uchar) c)) |
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continue; |
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else if (c == '#') |
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(void)d->readLine(buf, buflen); |
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else |
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break; |
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} |
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return val; |
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} |
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|
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static bool read_pbm_header(QIODevice *device, char& type, int& w, int& h, int& mcc) |
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{ |
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char buf[3]; |
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if (device->read(buf, 3) != 3) // read P[1-6]<white-space> |
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return false; |
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|
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if (!(buf[0] == 'P' && isdigit((uchar) buf[1]) && isspace((uchar) buf[2]))) |
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return false; |
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|
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type = buf[1]; |
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if (type < '1' || type > '6') |
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return false; |
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|
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w = read_pbm_int(device); // get image width |
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h = read_pbm_int(device); // get image height |
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|
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if (type == '1' || type == '4') |
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mcc = 1; // ignore max color component |
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else |
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mcc = read_pbm_int(device); // get max color component |
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|
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if (w <= 0 || w > 32767 || h <= 0 || h > 32767 || mcc <= 0) |
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return false; // weird P.M image |
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|
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return true; |
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} |
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|
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static bool read_pbm_body(QIODevice *device, char type, int w, int h, int mcc, QImage *outImage) |
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{ |
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int nbits, y; |
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int pbm_bpl; |
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bool raw; |
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|
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QImage::Format format; |
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switch (type) { |
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case '1': // ascii PBM |
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case '4': // raw PBM |
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nbits = 1; |
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format = QImage::Format_Mono; |
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break; |
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case '2': // ascii PGM |
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case '5': // raw PGM |
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nbits = 8; |
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format = QImage::Format_Indexed8; |
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break; |
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case '3': // ascii PPM |
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case '6': // raw PPM |
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nbits = 32; |
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format = QImage::Format_RGB32; |
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break; |
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default: |
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return false; |
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} |
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raw = type >= '4'; |
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|
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int maxc = mcc; |
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if (maxc > 255) |
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maxc = 255; |
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if (outImage->size() != QSize(w, h) || outImage->format() != format) { |
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*outImage = QImage(w, h, format); |
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if (outImage->isNull()) |
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return false; |
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} |
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|
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pbm_bpl = (nbits*w+7)/8; // bytes per scanline in PBM |
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|
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if (raw) { // read raw data |
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if (nbits == 32) { // type 6 |
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pbm_bpl = mcc < 256 ? 3*w : 6*w; |
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uchar *buf24 = new uchar[pbm_bpl], *b; |
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QRgb *p; |
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QRgb *end; |
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for (y=0; y<h; y++) { |
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if (device->read((char *)buf24, pbm_bpl) != pbm_bpl) { |
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delete[] buf24; |
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return false; |
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} |
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p = (QRgb *)outImage->scanLine(y); |
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end = p + w; |
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b = buf24; |
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while (p < end) { |
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if (mcc < 256) { |
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*p++ = qRgb(b[0],b[1],b[2]); |
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b += 3; |
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} else { |
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*p++ = qRgb(((int(b[0]) * 256 + int(b[1]) + 1) * 256) / (mcc + 1) - 1, |
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((int(b[2]) * 256 + int(b[3]) + 1) * 256) / (mcc + 1) - 1, |
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((int(b[4]) * 256 + int(b[5]) + 1) * 256) / (mcc + 1) - 1); |
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b += 6; |
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} |
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} |
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} |
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delete[] buf24; |
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} else { // type 4,5 |
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for (y=0; y<h; y++) { |
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if (device->read((char *)outImage->scanLine(y), pbm_bpl) |
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!= pbm_bpl) |
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return false; |
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} |
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} |
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} else { // read ascii data |
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register uchar *p; |
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int n; |
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for (y=0; y<h; y++) { |
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p = outImage->scanLine(y); |
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n = pbm_bpl; |
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if (nbits == 1) { |
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int b; |
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int bitsLeft = w; |
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while (n--) { |
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b = 0; |
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for (int i=0; i<8; i++) { |
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if (i < bitsLeft) |
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b = (b << 1) | (read_pbm_int(device) & 1); |
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else |
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b = (b << 1) | (0 & 1); // pad it our self if we need to |
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} |
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bitsLeft -= 8; |
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*p++ = b; |
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} |
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} else if (nbits == 8) { |
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if (mcc == maxc) { |
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while (n--) { |
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*p++ = read_pbm_int(device); |
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} |
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} else { |
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while (n--) { |
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*p++ = read_pbm_int(device) * maxc / mcc; |
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} |
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} |
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} else { // 32 bits |
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n /= 4; |
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int r, g, b; |
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if (mcc == maxc) { |
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while (n--) { |
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r = read_pbm_int(device); |
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g = read_pbm_int(device); |
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b = read_pbm_int(device); |
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*((QRgb*)p) = qRgb(r, g, b); |
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p += 4; |
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} |
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} else { |
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while (n--) { |
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r = read_pbm_int(device) * maxc / mcc; |
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g = read_pbm_int(device) * maxc / mcc; |
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b = read_pbm_int(device) * maxc / mcc; |
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*((QRgb*)p) = qRgb(r, g, b); |
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p += 4; |
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} |
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} |
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} |
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} |
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} |
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|
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if (nbits == 1) { // bitmap |
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outImage->setColorCount(2); |
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outImage->setColor(0, qRgb(255,255,255)); // white |
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outImage->setColor(1, qRgb(0,0,0)); // black |
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} else if (nbits == 8) { // graymap |
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outImage->setColorCount(maxc+1); |
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for (int i=0; i<=maxc; i++) |
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outImage->setColor(i, qRgb(i*255/maxc,i*255/maxc,i*255/maxc)); |
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} |
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|
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return true; |
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} |
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|
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static bool write_pbm_image(QIODevice *out, const QImage &sourceImage, const QByteArray &sourceFormat) |
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{ |
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QByteArray str; |
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QImage image = sourceImage; |
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QByteArray format = sourceFormat; |
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|
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format = format.left(3); // ignore RAW part |
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bool gray = format == "pgm"; |
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|
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if (format == "pbm") { |
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image = image.convertToFormat(QImage::Format_Mono); |
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} else if (image.depth() == 1) { |
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image = image.convertToFormat(QImage::Format_Indexed8); |
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} else { |
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switch (image.format()) { |
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case QImage::Format_RGB16: |
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case QImage::Format_RGB666: |
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case QImage::Format_RGB555: |
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case QImage::Format_RGB888: |
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case QImage::Format_RGB444: |
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image = image.convertToFormat(QImage::Format_RGB32); |
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break; |
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case QImage::Format_ARGB8565_Premultiplied: |
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case QImage::Format_ARGB6666_Premultiplied: |
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case QImage::Format_ARGB8555_Premultiplied: |
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case QImage::Format_ARGB4444_Premultiplied: |
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image = image.convertToFormat(QImage::Format_ARGB32); |
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break; |
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default: |
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break; |
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} |
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} |
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|
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if (image.depth() == 1 && image.colorCount() == 2) { |
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if (qGray(image.color(0)) < qGray(image.color(1))) { |
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// 0=dark/black, 1=light/white - invert |
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image.detach(); |
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for (int y=0; y<image.height(); y++) { |
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uchar *p = image.scanLine(y); |
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uchar *end = p + image.bytesPerLine(); |
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while (p < end) |
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*p++ ^= 0xff; |
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} |
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} |
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} |
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|
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uint w = image.width(); |
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uint h = image.height(); |
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|
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str = "P\n"; |
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str += QByteArray::number(w); |
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str += ' '; |
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str += QByteArray::number(h); |
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str += '\n'; |
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|
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switch (image.depth()) { |
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case 1: { |
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str.insert(1, '4'); |
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if (out->write(str, str.length()) != str.length()) |
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return false; |
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w = (w+7)/8; |
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for (uint y=0; y<h; y++) { |
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uchar* line = image.scanLine(y); |
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if (w != (uint)out->write((char*)line, w)) |
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return false; |
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} |
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} |
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break; |
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|
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case 8: { |
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str.insert(1, gray ? '5' : '6'); |
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str.append("255\n"); |
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if (out->write(str, str.length()) != str.length()) |
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return false; |
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QVector<QRgb> color = image.colorTable(); |
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uint bpl = w*(gray ? 1 : 3); |
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uchar *buf = new uchar[bpl]; |
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for (uint y=0; y<h; y++) { |
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uchar *b = image.scanLine(y); |
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uchar *p = buf; |
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uchar *end = buf+bpl; |
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if (gray) { |
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while (p < end) { |
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uchar g = (uchar)qGray(color[*b++]); |
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*p++ = g; |
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} |
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} else { |
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while (p < end) { |
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QRgb rgb = color[*b++]; |
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*p++ = qRed(rgb); |
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*p++ = qGreen(rgb); |
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*p++ = qBlue(rgb); |
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} |
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} |
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if (bpl != (uint)out->write((char*)buf, bpl)) |
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return false; |
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} |
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delete [] buf; |
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} |
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break; |
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|
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case 32: { |
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str.insert(1, gray ? '5' : '6'); |
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str.append("255\n"); |
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if (out->write(str, str.length()) != str.length()) |
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return false; |
| 363 |
uint bpl = w*(gray ? 1 : 3); |
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uchar *buf = new uchar[bpl]; |
| 365 |
for (uint y=0; y<h; y++) { |
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QRgb *b = (QRgb*)image.scanLine(y); |
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uchar *p = buf; |
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uchar *end = buf+bpl; |
| 369 |
if (gray) { |
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while (p < end) { |
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uchar g = (uchar)qGray(*b++); |
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*p++ = g; |
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} |
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} else { |
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while (p < end) { |
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QRgb rgb = *b++; |
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*p++ = qRed(rgb); |
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*p++ = qGreen(rgb); |
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*p++ = qBlue(rgb); |
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} |
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} |
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if (bpl != (uint)out->write((char*)buf, bpl)) |
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return false; |
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} |
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delete [] buf; |
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} |
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break; |
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|
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default: |
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return false; |
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} |
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|
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return true; |
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} |
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|
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QPpmHandler::QPpmHandler() |
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: state(Ready) |
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{ |
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} |
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|
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bool QPpmHandler::readHeader() |
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{ |
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state = Error; |
| 404 |
if (!read_pbm_header(device(), type, width, height, mcc)) |
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return false; |
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state = ReadHeader; |
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return true; |
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} |
| 409 |
|
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bool QPpmHandler::canRead() const |
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{ |
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if (state == Ready) { |
| 413 |
if (!canRead(device(), &subType)) |
| 414 |
return false; |
| 415 |
setFormat(subType); |
| 416 |
return true; |
| 417 |
} |
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return state != Error; |
| 419 |
} |
| 420 |
|
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bool QPpmHandler::canRead(QIODevice *device, QByteArray *subType) |
| 422 |
{ |
| 423 |
if (!device) { |
| 424 |
qWarning("QPpmHandler::canRead() called with no device"); |
| 425 |
return false; |
| 426 |
} |
| 427 |
|
| 428 |
char head[2]; |
| 429 |
if (device->peek(head, sizeof(head)) != sizeof(head)) |
| 430 |
return false; |
| 431 |
|
| 432 |
if (head[0] != 'P') |
| 433 |
return false; |
| 434 |
|
| 435 |
if (head[1] == '1' || head[1] == '4') { |
| 436 |
if (subType) |
| 437 |
*subType = "pbm"; |
| 438 |
} else if (head[1] == '2' || head[1] == '5') { |
| 439 |
if (subType) |
| 440 |
*subType = "pgm"; |
| 441 |
} else if (head[1] == '3' || head[1] == '6') { |
| 442 |
if (subType) |
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*subType = "ppm"; |
| 444 |
} else { |
| 445 |
return false; |
| 446 |
} |
| 447 |
return true; |
| 448 |
} |
| 449 |
|
| 450 |
bool QPpmHandler::read(QImage *image) |
| 451 |
{ |
| 452 |
if (state == Error) |
| 453 |
return false; |
| 454 |
|
| 455 |
if (state == Ready && !readHeader()) { |
| 456 |
state = Error; |
| 457 |
return false; |
| 458 |
} |
| 459 |
|
| 460 |
if (!read_pbm_body(device(), type, width, height, mcc, image)) { |
| 461 |
state = Error; |
| 462 |
return false; |
| 463 |
} |
| 464 |
|
| 465 |
state = Ready; |
| 466 |
return true; |
| 467 |
} |
| 468 |
|
| 469 |
bool QPpmHandler::write(const QImage &image) |
| 470 |
{ |
| 471 |
return write_pbm_image(device(), image, subType); |
| 472 |
} |
| 473 |
|
| 474 |
bool QPpmHandler::supportsOption(ImageOption option) const |
| 475 |
{ |
| 476 |
return option == SubType |
| 477 |
|| option == Size |
| 478 |
|| option == ImageFormat; |
| 479 |
} |
| 480 |
|
| 481 |
QVariant QPpmHandler::option(ImageOption option) const |
| 482 |
{ |
| 483 |
if (option == SubType) { |
| 484 |
return subType; |
| 485 |
} else if (option == Size) { |
| 486 |
if (state == Error) |
| 487 |
return QVariant(); |
| 488 |
if (state == Ready && !const_cast<QPpmHandler*>(this)->readHeader()) |
| 489 |
return QVariant(); |
| 490 |
return QSize(width, height); |
| 491 |
} else if (option == ImageFormat) { |
| 492 |
if (state == Error) |
| 493 |
return QVariant(); |
| 494 |
if (state == Ready && !const_cast<QPpmHandler*>(this)->readHeader()) |
| 495 |
return QVariant(); |
| 496 |
QImage::Format format = QImage::Format_Invalid; |
| 497 |
switch (type) { |
| 498 |
case '1': // ascii PBM |
| 499 |
case '4': // raw PBM |
| 500 |
format = QImage::Format_Mono; |
| 501 |
break; |
| 502 |
case '2': // ascii PGM |
| 503 |
case '5': // raw PGM |
| 504 |
format = QImage::Format_Indexed8; |
| 505 |
break; |
| 506 |
case '3': // ascii PPM |
| 507 |
case '6': // raw PPM |
| 508 |
format = QImage::Format_RGB32; |
| 509 |
break; |
| 510 |
default: |
| 511 |
break; |
| 512 |
} |
| 513 |
return format; |
| 514 |
} |
| 515 |
return QVariant(); |
| 516 |
} |
| 517 |
|
| 518 |
void QPpmHandler::setOption(ImageOption option, const QVariant &value) |
| 519 |
{ |
| 520 |
if (option == SubType) |
| 521 |
subType = value.toByteArray().toLower(); |
| 522 |
} |
| 523 |
|
| 524 |
QByteArray QPpmHandler::name() const |
| 525 |
{ |
| 526 |
return subType.isEmpty() ? QByteArray("ppm") : subType; |
| 527 |
} |
| 528 |
|
| 529 |
QT_END_NAMESPACE |
| 530 |
|
| 531 |
#endif // QT_NO_IMAGEFORMAT_PPM |
