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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 plugins 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 "qsvgiohandler.h" |
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43 |
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44 #ifndef QT_NO_SVGRENDERER |
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45 |
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46 #include "qsvgrenderer.h" |
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47 #include "qimage.h" |
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48 #include "qpixmap.h" |
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49 #include "qpainter.h" |
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50 #include "qvariant.h" |
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51 #include "qdebug.h" |
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52 |
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53 QT_BEGIN_NAMESPACE |
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54 |
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55 class QSvgIOHandlerPrivate |
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56 { |
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57 public: |
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58 QSvgIOHandlerPrivate() |
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59 : r(new QSvgRenderer()), loaded(false) |
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60 {} |
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61 ~QSvgIOHandlerPrivate() |
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62 { |
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63 delete r; |
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64 } |
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65 |
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66 bool load(QIODevice *device); |
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67 static bool findSvgTag(QIODevice *device); |
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68 |
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69 QSvgRenderer *r; |
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70 QSize defaultSize; |
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71 QSize currentSize; |
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72 bool loaded; |
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73 }; |
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74 |
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75 bool QSvgIOHandlerPrivate::load(QIODevice *device) |
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76 { |
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77 if (loaded) |
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78 return true; |
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79 |
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80 if (r->load(device->readAll())) { |
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81 defaultSize = QSize(r->viewBox().width(), r->viewBox().height()); |
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82 if (currentSize.isEmpty()) |
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83 currentSize = defaultSize; |
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84 } |
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85 loaded = r->isValid(); |
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86 |
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87 return loaded; |
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88 } |
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89 |
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90 bool QSvgIOHandlerPrivate::findSvgTag(QIODevice *device) |
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91 { |
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92 qint64 pos = device->pos(); |
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93 device->seek(0); |
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94 char buffer[256]; |
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95 const char svg_tag[] = "<svg"; |
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96 |
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97 while (1) { |
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98 int size = device->read(buffer, 256); |
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99 for (int i=0; i<size - 5; ++i) { |
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100 if (!memcmp(buffer + i, svg_tag, 4)) { |
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101 if (buffer[i+4] == ' ' || buffer[i+4] == '\t' |
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102 || buffer[i+4] == '\n' || buffer[i+4] == '\r') |
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103 { |
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104 device->seek(pos); |
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105 return true; |
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106 } |
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107 } |
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108 } |
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109 if (device->atEnd()) |
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110 break; |
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111 device->seek(device->pos()-4); |
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112 } |
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113 device->seek(pos); |
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114 return false; |
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115 } |
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116 |
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117 QSvgIOHandler::QSvgIOHandler() |
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118 : d(new QSvgIOHandlerPrivate()) |
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119 { |
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120 |
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121 } |
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122 |
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123 |
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124 QSvgIOHandler::~QSvgIOHandler() |
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125 { |
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126 delete d; |
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127 } |
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128 |
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129 |
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130 bool QSvgIOHandler::canRead() const |
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131 { |
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132 return QSvgIOHandlerPrivate::findSvgTag(device()); |
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133 } |
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134 |
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135 |
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136 QByteArray QSvgIOHandler::name() const |
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137 { |
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138 return "svg"; |
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139 } |
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140 |
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141 |
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142 bool QSvgIOHandler::read(QImage *image) |
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143 { |
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144 if (d->load(device())) { |
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145 *image = QImage(d->currentSize, QImage::Format_ARGB32_Premultiplied); |
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146 if (!d->currentSize.isEmpty()) { |
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147 image->fill(0x00000000); |
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148 QPainter p(image); |
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149 d->r->render(&p); |
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150 p.end(); |
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151 } |
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152 return true; |
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153 } |
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154 |
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155 return false; |
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156 } |
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157 |
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158 |
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159 QVariant QSvgIOHandler::option(ImageOption option) const |
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160 { |
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161 switch(option) { |
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162 case ImageFormat: |
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163 return QImage::Format_ARGB32_Premultiplied; |
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164 break; |
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165 case Size: |
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166 d->load(device()); |
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167 return d->defaultSize; |
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168 break; |
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169 case ScaledSize: |
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170 return d->currentSize; |
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171 break; |
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172 default: |
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173 break; |
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174 } |
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175 return QVariant(); |
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176 } |
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177 |
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178 |
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179 void QSvgIOHandler::setOption(ImageOption option, const QVariant & value) |
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180 { |
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181 switch(option) { |
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182 case Size: |
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183 d->defaultSize = value.toSize(); |
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184 d->currentSize = value.toSize(); |
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185 break; |
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186 case ScaledSize: |
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187 d->currentSize = value.toSize(); |
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188 break; |
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189 default: |
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190 break; |
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191 } |
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192 } |
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193 |
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194 |
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195 bool QSvgIOHandler::supportsOption(ImageOption option) const |
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196 { |
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197 switch(option) |
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198 { |
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199 case ImageFormat: |
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200 case Size: |
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201 case ScaledSize: |
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202 return true; |
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203 default: |
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204 break; |
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205 } |
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206 return false; |
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207 } |
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208 |
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209 bool QSvgIOHandler::canRead(QIODevice *device) |
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210 { |
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211 return QSvgIOHandlerPrivate::findSvgTag(device); |
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212 } |
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213 |
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214 QT_END_NAMESPACE |
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215 |
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216 #endif // QT_NO_SVGRENDERER |