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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the QtGui module of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #include <qplatformdefs.h> |
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43 #include "private/qxbmhandler_p.h" |
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44 |
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45 #ifndef QT_NO_IMAGEFORMAT_XBM |
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46 |
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47 #include <qimage.h> |
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48 #include <qiodevice.h> |
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49 #include <qvariant.h> |
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50 |
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51 #include <stdio.h> |
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52 #include <ctype.h> |
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53 |
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54 QT_BEGIN_NAMESPACE |
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55 |
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56 /***************************************************************************** |
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57 X bitmap image read/write functions |
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58 *****************************************************************************/ |
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59 |
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60 static inline int hex2byte(register char *p) |
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61 { |
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62 return ((isdigit((uchar) *p) ? *p - '0' : toupper((uchar) *p) - 'A' + 10) << 4) | |
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63 (isdigit((uchar) *(p+1)) ? *(p+1) - '0' : toupper((uchar) *(p+1)) - 'A' + 10); |
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64 } |
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65 |
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66 static bool read_xbm_header(QIODevice *device, int& w, int& h) |
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67 { |
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68 const int buflen = 300; |
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69 char buf[buflen + 1]; |
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70 QRegExp r1(QLatin1String("^#define[ \t]+[a-zA-Z0-9._]+[ \t]+")); |
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71 QRegExp r2(QLatin1String("[0-9]+")); |
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72 |
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73 qint64 readBytes = 0; |
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74 |
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75 // "#define .._width <num>" |
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76 readBytes = device->readLine(buf, buflen); |
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77 if (readBytes <= 0) |
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78 return false; |
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79 buf[readBytes - 1] = '\0'; |
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80 |
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81 // skip initial comment, if any |
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82 while (buf[0] != '#' && (readBytes = device->readLine( buf, buflen )) > 0) {} |
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83 |
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84 if (readBytes <= 0) |
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85 return false; |
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86 buf[readBytes - 1] = '\0'; |
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87 QString sbuf; |
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88 sbuf = QString::fromLatin1(buf); |
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89 |
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90 if (r1.indexIn(sbuf) == 0 && |
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91 r2.indexIn(sbuf, r1.matchedLength()) == r1.matchedLength()) |
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92 w = QByteArray(&buf[r1.matchedLength()]).trimmed().toInt(); |
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93 |
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94 // "#define .._height <num>" |
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95 readBytes = device->readLine(buf, buflen); |
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96 if (readBytes <= 0) |
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97 return false; |
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98 buf[readBytes - 1] = '\0'; |
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99 |
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100 sbuf = QString::fromLatin1(buf); |
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101 |
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102 if (r1.indexIn(sbuf) == 0 && |
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103 r2.indexIn(sbuf, r1.matchedLength()) == r1.matchedLength()) |
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104 h = QByteArray(&buf[r1.matchedLength()]).trimmed().toInt(); |
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105 |
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106 // format error |
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107 if (w <= 0 || w > 32767 || h <= 0 || h > 32767) |
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108 return false; |
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109 |
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110 return true; |
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111 } |
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112 |
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113 static bool read_xbm_body(QIODevice *device, int w, int h, QImage *outImage) |
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114 { |
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115 const int buflen = 300; |
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116 char buf[buflen + 1]; |
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117 |
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118 qint64 readBytes = 0; |
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119 |
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120 // scan for database |
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121 for (;;) { |
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122 if ((readBytes = device->readLine(buf, buflen)) <= 0) { |
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123 // end of file |
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124 return false; |
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125 } |
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126 |
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127 buf[readBytes] = '\0'; |
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128 if (QByteArray::fromRawData(buf, readBytes).contains("0x")) |
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129 break; |
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130 } |
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131 |
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132 if (outImage->size() != QSize(w, h) || outImage->format() != QImage::Format_MonoLSB) { |
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133 *outImage = QImage(w, h, QImage::Format_MonoLSB); |
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134 if (outImage->isNull()) |
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135 return false; |
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136 } |
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137 |
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138 outImage->setNumColors(2); |
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139 outImage->setColor(0, qRgb(255,255,255)); // white |
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140 outImage->setColor(1, qRgb(0,0,0)); // black |
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141 |
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142 int x = 0, y = 0; |
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143 uchar *b = outImage->scanLine(0); |
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144 char *p = buf + QByteArray::fromRawData(buf, readBytes).indexOf("0x"); |
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145 w = (w+7)/8; // byte width |
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146 |
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147 while (y < h) { // for all encoded bytes... |
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148 if (p) { // p = "0x.." |
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149 *b++ = hex2byte(p+2); |
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150 p += 2; |
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151 if (++x == w && ++y < h) { |
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152 b = outImage->scanLine(y); |
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153 x = 0; |
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154 } |
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155 p = strstr(p, "0x"); |
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156 } else { // read another line |
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157 if ((readBytes = device->readLine(buf,buflen)) <= 0) // EOF ==> truncated image |
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158 break; |
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159 p = buf + QByteArray::fromRawData(buf, readBytes).indexOf("0x"); |
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160 } |
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161 } |
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162 |
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163 return true; |
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164 } |
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165 |
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166 static bool read_xbm_image(QIODevice *device, QImage *outImage) |
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167 { |
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168 int w = 0, h = 0; |
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169 if (!read_xbm_header(device, w, h)) |
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170 return false; |
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171 return read_xbm_body(device, w, h, outImage); |
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172 } |
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173 |
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174 static bool write_xbm_image(const QImage &sourceImage, QIODevice *device, const QString &fileName) |
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175 { |
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176 QImage image = sourceImage; |
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177 int w = image.width(); |
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178 int h = image.height(); |
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179 int i; |
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180 QString s = fileName; // get file base name |
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181 int msize = s.length() + 100; |
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182 char *buf = new char[msize]; |
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183 |
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184 qsnprintf(buf, msize, "#define %s_width %d\n", s.toAscii().data(), w); |
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185 device->write(buf, qstrlen(buf)); |
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186 qsnprintf(buf, msize, "#define %s_height %d\n", s.toAscii().data(), h); |
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187 device->write(buf, qstrlen(buf)); |
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188 qsnprintf(buf, msize, "static char %s_bits[] = {\n ", s.toAscii().data()); |
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189 device->write(buf, qstrlen(buf)); |
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190 |
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191 if (image.format() != QImage::Format_MonoLSB) |
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192 image = image.convertToFormat(QImage::Format_MonoLSB); |
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193 |
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194 bool invert = qGray(image.color(0)) < qGray(image.color(1)); |
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195 char hexrep[16]; |
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196 for (i=0; i<10; i++) |
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197 hexrep[i] = '0' + i; |
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198 for (i=10; i<16; i++) |
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199 hexrep[i] = 'a' -10 + i; |
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200 if (invert) { |
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201 char t; |
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202 for (i=0; i<8; i++) { |
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203 t = hexrep[15-i]; |
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204 hexrep[15-i] = hexrep[i]; |
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205 hexrep[i] = t; |
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206 } |
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207 } |
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208 int bcnt = 0; |
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209 register char *p = buf; |
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210 int bpl = (w+7)/8; |
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211 for (int y = 0; y < h; ++y) { |
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212 uchar *b = image.scanLine(y); |
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213 for (i = 0; i < bpl; ++i) { |
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214 *p++ = '0'; *p++ = 'x'; |
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215 *p++ = hexrep[*b >> 4]; |
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216 *p++ = hexrep[*b++ & 0xf]; |
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217 |
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218 if (i < bpl - 1 || y < h - 1) { |
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219 *p++ = ','; |
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220 if (++bcnt > 14) { |
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221 *p++ = '\n'; |
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222 *p++ = ' '; |
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223 *p = '\0'; |
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224 if ((int)qstrlen(buf) != device->write(buf, qstrlen(buf))) { |
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225 delete [] buf; |
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226 return false; |
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227 } |
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228 p = buf; |
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229 bcnt = 0; |
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230 } |
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231 } |
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232 } |
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233 } |
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234 #if defined(_MSC_VER) && _MSC_VER >= 1400 |
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235 strcpy_s(p, sizeof(" };\n"), " };\n"); |
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236 #else |
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237 strcpy(p, " };\n"); |
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238 #endif |
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239 if ((int)qstrlen(buf) != device->write(buf, qstrlen(buf))) { |
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240 delete [] buf; |
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241 return false; |
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242 } |
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243 |
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244 delete [] buf; |
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245 return true; |
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246 } |
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247 |
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248 QXbmHandler::QXbmHandler() |
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249 : state(Ready) |
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250 { |
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251 } |
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252 |
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253 bool QXbmHandler::readHeader() |
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254 { |
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255 state = Error; |
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256 if (!read_xbm_header(device(), width, height)) |
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257 return false; |
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258 state = ReadHeader; |
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259 return true; |
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260 } |
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261 |
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262 bool QXbmHandler::canRead() const |
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263 { |
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264 if (state == Ready) { |
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265 if (!canRead(device())) |
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266 return false; |
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267 setFormat("xbm"); |
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268 return true; |
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269 } |
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270 return state != Error; |
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271 } |
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272 |
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273 bool QXbmHandler::canRead(QIODevice *device) |
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274 { |
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275 QImage image; |
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276 |
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277 // it's impossible to tell whether we can load an XBM or not when |
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278 // it's from a sequential device, as the only way to do it is to |
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279 // attempt to parse the whole image. |
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280 if (device->isSequential()) |
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281 return false; |
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282 |
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283 qint64 oldPos = device->pos(); |
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284 bool success = read_xbm_image(device, &image); |
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285 device->seek(oldPos); |
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286 |
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287 return success; |
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288 } |
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289 |
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290 bool QXbmHandler::read(QImage *image) |
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291 { |
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292 if (state == Error) |
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293 return false; |
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294 |
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295 if (state == Ready && !readHeader()) { |
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296 state = Error; |
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297 return false; |
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298 } |
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299 |
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300 if (!read_xbm_body(device(), width, height, image)) { |
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301 state = Error; |
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302 return false; |
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303 } |
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304 |
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305 state = Ready; |
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306 return true; |
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307 } |
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308 |
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309 bool QXbmHandler::write(const QImage &image) |
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310 { |
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311 return write_xbm_image(image, device(), fileName); |
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312 } |
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313 |
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314 bool QXbmHandler::supportsOption(ImageOption option) const |
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315 { |
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316 return option == Name |
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317 || option == Size |
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318 || option == ImageFormat; |
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319 } |
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320 |
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321 QVariant QXbmHandler::option(ImageOption option) const |
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322 { |
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323 if (option == Name) { |
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324 return fileName; |
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325 } else if (option == Size) { |
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326 if (state == Error) |
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327 return QVariant(); |
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328 if (state == Ready && !const_cast<QXbmHandler*>(this)->readHeader()) |
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329 return QVariant(); |
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330 return QSize(width, height); |
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331 } else if (option == ImageFormat) { |
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332 return QImage::Format_MonoLSB; |
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333 } |
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334 return QVariant(); |
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335 } |
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336 |
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337 void QXbmHandler::setOption(ImageOption option, const QVariant &value) |
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338 { |
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339 if (option == Name) |
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340 fileName = value.toString(); |
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341 } |
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342 |
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343 QByteArray QXbmHandler::name() const |
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344 { |
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345 return "xbm"; |
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346 } |
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347 |
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348 QT_END_NAMESPACE |
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349 |
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350 #endif // QT_NO_IMAGEFORMAT_XBM |