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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2010 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 "qjpeghandler_p.h" |
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43 |
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44 #include <qimage.h> |
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45 #include <qvariant.h> |
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46 #include <qvector.h> |
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47 #include <qbuffer.h> |
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48 |
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49 #include <stdio.h> // jpeglib needs this to be pre-included |
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50 #include <setjmp.h> |
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51 |
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52 #ifdef FAR |
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53 #undef FAR |
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54 #endif |
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55 |
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56 // including jpeglib.h seems to be a little messy |
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57 extern "C" { |
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58 // mingw includes rpcndr.h but does not define boolean |
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59 #if defined(Q_OS_WIN) && defined(Q_CC_GNU) |
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60 # if defined(__RPCNDR_H__) && !defined(boolean) |
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61 typedef unsigned char boolean; |
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62 # define HAVE_BOOLEAN |
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63 # endif |
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64 #endif |
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65 |
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66 #define XMD_H // shut JPEGlib up |
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67 #if defined(Q_OS_UNIXWARE) |
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68 # define HAVE_BOOLEAN // libjpeg under Unixware seems to need this |
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69 #endif |
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70 #include <jpeglib.h> |
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71 #ifdef const |
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72 # undef const // remove crazy C hackery in jconfig.h |
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73 #endif |
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74 } |
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75 |
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76 QT_BEGIN_NAMESPACE |
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77 |
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78 struct my_error_mgr : public jpeg_error_mgr { |
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79 jmp_buf setjmp_buffer; |
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80 }; |
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81 |
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82 #if defined(Q_C_CALLBACKS) |
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83 extern "C" { |
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84 #endif |
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85 |
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86 static void my_error_exit (j_common_ptr cinfo) |
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87 { |
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88 my_error_mgr* myerr = (my_error_mgr*) cinfo->err; |
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89 char buffer[JMSG_LENGTH_MAX]; |
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90 (*cinfo->err->format_message)(cinfo, buffer); |
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91 qWarning("%s", buffer); |
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92 longjmp(myerr->setjmp_buffer, 1); |
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93 } |
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94 |
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95 #if defined(Q_C_CALLBACKS) |
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96 } |
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97 #endif |
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98 |
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99 |
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100 static const int max_buf = 4096; |
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101 |
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102 struct my_jpeg_source_mgr : public jpeg_source_mgr { |
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103 // Nothing dynamic - cannot rely on destruction over longjump |
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104 QIODevice *device; |
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105 JOCTET buffer[max_buf]; |
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106 const QBuffer *memDevice; |
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107 |
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108 public: |
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109 my_jpeg_source_mgr(QIODevice *device); |
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110 }; |
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111 |
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112 #if defined(Q_C_CALLBACKS) |
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113 extern "C" { |
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114 #endif |
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115 |
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116 static void qt_init_source(j_decompress_ptr) |
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117 { |
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118 } |
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119 |
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120 static boolean qt_fill_input_buffer(j_decompress_ptr cinfo) |
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121 { |
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122 my_jpeg_source_mgr* src = (my_jpeg_source_mgr*)cinfo->src; |
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123 if (src->memDevice) { |
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124 src->next_input_byte = (const JOCTET *)(src->memDevice->data().constData() + src->memDevice->pos()); |
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125 src->bytes_in_buffer = (size_t)(src->memDevice->data().size() - src->memDevice->pos()); |
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126 return true; |
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127 } |
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128 src->next_input_byte = src->buffer; |
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129 int num_read = src->device->read((char*)src->buffer, max_buf); |
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130 if (num_read <= 0) { |
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131 // Insert a fake EOI marker - as per jpeglib recommendation |
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132 src->buffer[0] = (JOCTET) 0xFF; |
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133 src->buffer[1] = (JOCTET) JPEG_EOI; |
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134 src->bytes_in_buffer = 2; |
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135 } else { |
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136 src->bytes_in_buffer = num_read; |
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137 } |
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138 #if defined(Q_OS_UNIXWARE) |
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139 return B_TRUE; |
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140 #else |
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141 return true; |
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142 #endif |
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143 } |
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144 |
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145 static void qt_skip_input_data(j_decompress_ptr cinfo, long num_bytes) |
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146 { |
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147 my_jpeg_source_mgr* src = (my_jpeg_source_mgr*)cinfo->src; |
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148 |
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149 // `dumb' implementation from jpeglib |
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150 |
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151 /* Just a dumb implementation for now. Could use fseek() except |
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152 * it doesn't work on pipes. Not clear that being smart is worth |
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153 * any trouble anyway --- large skips are infrequent. |
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154 */ |
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155 if (num_bytes > 0) { |
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156 while (num_bytes > (long) src->bytes_in_buffer) { // Should not happen in case of memDevice |
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157 num_bytes -= (long) src->bytes_in_buffer; |
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158 (void) qt_fill_input_buffer(cinfo); |
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159 /* note we assume that qt_fill_input_buffer will never return false, |
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160 * so suspension need not be handled. |
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161 */ |
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162 } |
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163 src->next_input_byte += (size_t) num_bytes; |
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164 src->bytes_in_buffer -= (size_t) num_bytes; |
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165 } |
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166 } |
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167 |
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168 static void qt_term_source(j_decompress_ptr cinfo) |
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169 { |
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170 my_jpeg_source_mgr* src = (my_jpeg_source_mgr*)cinfo->src; |
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171 if (!src->device->isSequential()) |
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172 { |
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173 // read() isn't used for memDevice, so seek past everything that was used |
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174 if (src->memDevice) |
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175 src->device->seek(src->device->pos() + (src->memDevice->data().size() - src->memDevice->pos() - src->bytes_in_buffer)); |
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176 else |
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177 src->device->seek(src->device->pos() - src->bytes_in_buffer); |
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178 } |
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179 } |
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180 |
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181 #if defined(Q_C_CALLBACKS) |
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182 } |
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183 #endif |
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184 |
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185 inline my_jpeg_source_mgr::my_jpeg_source_mgr(QIODevice *device) |
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186 { |
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187 jpeg_source_mgr::init_source = qt_init_source; |
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188 jpeg_source_mgr::fill_input_buffer = qt_fill_input_buffer; |
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189 jpeg_source_mgr::skip_input_data = qt_skip_input_data; |
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190 jpeg_source_mgr::resync_to_restart = jpeg_resync_to_restart; |
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191 jpeg_source_mgr::term_source = qt_term_source; |
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192 this->device = device; |
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193 memDevice = qobject_cast<QBuffer *>(device); |
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194 bytes_in_buffer = 0; |
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195 next_input_byte = buffer; |
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196 } |
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197 |
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198 |
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199 inline static bool read_jpeg_size(int &w, int &h, j_decompress_ptr cinfo) |
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200 { |
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201 (void) jpeg_calc_output_dimensions(cinfo); |
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202 |
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203 w = cinfo->output_width; |
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204 h = cinfo->output_height; |
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205 return true; |
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206 } |
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207 |
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208 #define HIGH_QUALITY_THRESHOLD 50 |
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209 |
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210 inline static bool read_jpeg_format(QImage::Format &format, j_decompress_ptr cinfo) |
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211 { |
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212 |
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213 bool result = true; |
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214 switch (cinfo->output_components) { |
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215 case 1: |
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216 format = QImage::Format_Indexed8; |
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217 break; |
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218 case 3: |
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219 case 4: |
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220 format = QImage::Format_RGB32; |
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221 break; |
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222 default: |
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223 result = false; |
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224 break; |
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225 } |
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226 cinfo->output_scanline = cinfo->output_height; |
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227 return result; |
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228 } |
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229 |
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230 static bool ensureValidImage(QImage *dest, struct jpeg_decompress_struct *info, |
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231 const QSize& size) |
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232 { |
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233 QImage::Format format; |
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234 switch (info->output_components) { |
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235 case 1: |
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236 format = QImage::Format_Indexed8; |
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237 break; |
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238 case 3: |
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239 case 4: |
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240 format = QImage::Format_RGB32; |
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241 break; |
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242 default: |
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243 return false; // unsupported format |
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244 } |
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245 |
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246 if (dest->size() != size || dest->format() != format) { |
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247 *dest = QImage(size, format); |
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248 |
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249 if (format == QImage::Format_Indexed8) { |
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250 dest->setColorCount(256); |
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251 for (int i = 0; i < 256; i++) |
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252 dest->setColor(i, qRgb(i,i,i)); |
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253 } |
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254 } |
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255 |
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256 return !dest->isNull(); |
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257 } |
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258 |
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259 static bool read_jpeg_image(QImage *outImage, |
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260 QSize scaledSize, QRect scaledClipRect, |
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261 QRect clipRect, int inQuality, j_decompress_ptr info, struct my_error_mgr* err ) |
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262 { |
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263 if (!setjmp(err->setjmp_buffer)) { |
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264 // -1 means default quality. |
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265 int quality = inQuality; |
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266 if (quality < 0) |
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267 quality = 75; |
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268 |
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269 // If possible, merge the scaledClipRect into either scaledSize |
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270 // or clipRect to avoid doing a separate scaled clipping pass. |
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271 // Best results are achieved by clipping before scaling, not after. |
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272 if (!scaledClipRect.isEmpty()) { |
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273 if (scaledSize.isEmpty() && clipRect.isEmpty()) { |
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274 // No clipping or scaling before final clip. |
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275 clipRect = scaledClipRect; |
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276 scaledClipRect = QRect(); |
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277 } else if (scaledSize.isEmpty()) { |
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278 // Clipping, but no scaling: combine the clip regions. |
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279 scaledClipRect.translate(clipRect.topLeft()); |
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280 clipRect = scaledClipRect.intersected(clipRect); |
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281 scaledClipRect = QRect(); |
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282 } else if (clipRect.isEmpty()) { |
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283 // No clipping, but scaling: if we can map back to an |
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284 // integer pixel boundary, then clip before scaling. |
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285 if ((info->image_width % scaledSize.width()) == 0 && |
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286 (info->image_height % scaledSize.height()) == 0) { |
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287 int x = scaledClipRect.x() * info->image_width / |
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288 scaledSize.width(); |
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289 int y = scaledClipRect.y() * info->image_height / |
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290 scaledSize.height(); |
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291 int width = (scaledClipRect.right() + 1) * |
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292 info->image_width / scaledSize.width() - x; |
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293 int height = (scaledClipRect.bottom() + 1) * |
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294 info->image_height / scaledSize.height() - y; |
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295 clipRect = QRect(x, y, width, height); |
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296 scaledSize = scaledClipRect.size(); |
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297 scaledClipRect = QRect(); |
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298 } |
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299 } else { |
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300 // Clipping and scaling: too difficult to figure out, |
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301 // and not a likely use case, so do it the long way. |
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302 } |
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303 } |
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304 |
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305 // Determine the scale factor to pass to libjpeg for quick downscaling. |
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306 if (!scaledSize.isEmpty()) { |
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307 if (clipRect.isEmpty()) { |
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308 info->scale_denom = |
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309 qMin(info->image_width / scaledSize.width(), |
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310 info->image_height / scaledSize.height()); |
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311 } else { |
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312 info->scale_denom = |
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313 qMin(clipRect.width() / scaledSize.width(), |
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314 clipRect.height() / scaledSize.height()); |
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315 } |
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316 if (info->scale_denom < 2) { |
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317 info->scale_denom = 1; |
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318 } else if (info->scale_denom < 4) { |
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319 info->scale_denom = 2; |
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320 } else if (info->scale_denom < 8) { |
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321 info->scale_denom = 4; |
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322 } else { |
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323 info->scale_denom = 8; |
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324 } |
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325 info->scale_num = 1; |
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326 if (!clipRect.isEmpty()) { |
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327 // Correct the scale factor so that we clip accurately. |
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328 // It is recommended that the clip rectangle be aligned |
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329 // on an 8-pixel boundary for best performance. |
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330 while (info->scale_denom > 1 && |
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331 ((clipRect.x() % info->scale_denom) != 0 || |
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332 (clipRect.y() % info->scale_denom) != 0 || |
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333 (clipRect.width() % info->scale_denom) != 0 || |
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334 (clipRect.height() % info->scale_denom) != 0)) { |
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335 info->scale_denom /= 2; |
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336 } |
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337 } |
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338 } |
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339 |
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340 // If high quality not required, use fast decompression |
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341 if( quality < HIGH_QUALITY_THRESHOLD ) { |
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342 info->dct_method = JDCT_IFAST; |
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343 info->do_fancy_upsampling = FALSE; |
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344 } |
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345 |
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346 (void) jpeg_calc_output_dimensions(info); |
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347 |
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348 // Determine the clip region to extract. |
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349 QRect imageRect(0, 0, info->output_width, info->output_height); |
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350 QRect clip; |
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351 if (clipRect.isEmpty()) { |
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352 clip = imageRect; |
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353 } else if (info->scale_denom == info->scale_num) { |
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354 clip = clipRect.intersected(imageRect); |
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355 } else { |
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356 // The scale factor was corrected above to ensure that |
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357 // we don't miss pixels when we scale the clip rectangle. |
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358 clip = QRect(clipRect.x() / int(info->scale_denom), |
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359 clipRect.y() / int(info->scale_denom), |
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360 clipRect.width() / int(info->scale_denom), |
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361 clipRect.height() / int(info->scale_denom)); |
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362 clip = clip.intersected(imageRect); |
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363 } |
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364 |
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365 // Allocate memory for the clipped QImage. |
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366 if (!ensureValidImage(outImage, info, clip.size())) |
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367 longjmp(err->setjmp_buffer, 1); |
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368 |
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369 // Avoid memcpy() overhead if grayscale with no clipping. |
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370 bool quickGray = (info->output_components == 1 && |
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371 clip == imageRect); |
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372 if (!quickGray) { |
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373 // Ask the jpeg library to allocate a temporary row. |
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374 // The library will automatically delete it for us later. |
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375 // The libjpeg docs say we should do this before calling |
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376 // jpeg_start_decompress(). We can't use "new" here |
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377 // because we are inside the setjmp() block and an error |
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378 // in the jpeg input stream would cause a memory leak. |
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379 JSAMPARRAY rows = (info->mem->alloc_sarray) |
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380 ((j_common_ptr)info, JPOOL_IMAGE, |
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381 info->output_width * info->output_components, 1); |
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382 |
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383 (void) jpeg_start_decompress(info); |
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384 |
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385 while (info->output_scanline < info->output_height) { |
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386 int y = int(info->output_scanline) - clip.y(); |
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387 if (y >= clip.height()) |
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388 break; // We've read the entire clip region, so abort. |
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389 |
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390 (void) jpeg_read_scanlines(info, rows, 1); |
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391 |
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392 if (y < 0) |
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393 continue; // Haven't reached the starting line yet. |
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394 |
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395 if (info->output_components == 3) { |
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396 // Expand 24->32 bpp. |
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397 uchar *in = rows[0] + clip.x() * 3; |
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398 QRgb *out = (QRgb*)outImage->scanLine(y); |
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399 for (int i = 0; i < clip.width(); ++i) { |
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400 *out++ = qRgb(in[0], in[1], in[2]); |
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401 in += 3; |
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402 } |
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403 } else if (info->out_color_space == JCS_CMYK) { |
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404 // Convert CMYK->RGB. |
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405 uchar *in = rows[0] + clip.x() * 4; |
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406 QRgb *out = (QRgb*)outImage->scanLine(y); |
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407 for (int i = 0; i < clip.width(); ++i) { |
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408 int k = in[3]; |
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409 *out++ = qRgb(k * in[0] / 255, k * in[1] / 255, |
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410 k * in[2] / 255); |
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411 in += 4; |
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412 } |
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413 } else if (info->output_components == 1) { |
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414 // Grayscale. |
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415 memcpy(outImage->scanLine(y), |
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416 rows[0] + clip.x(), clip.width()); |
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417 } |
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418 } |
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419 } else { |
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420 // Load unclipped grayscale data directly into the QImage. |
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421 (void) jpeg_start_decompress(info); |
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422 while (info->output_scanline < info->output_height) { |
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423 uchar *row = outImage->scanLine(info->output_scanline); |
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424 (void) jpeg_read_scanlines(info, &row, 1); |
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425 } |
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426 } |
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427 |
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428 if (info->output_scanline == info->output_height) |
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429 (void) jpeg_finish_decompress(info); |
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430 |
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431 if (info->density_unit == 1) { |
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432 outImage->setDotsPerMeterX(int(100. * info->X_density / 2.54)); |
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433 outImage->setDotsPerMeterY(int(100. * info->Y_density / 2.54)); |
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434 } else if (info->density_unit == 2) { |
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435 outImage->setDotsPerMeterX(int(100. * info->X_density)); |
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436 outImage->setDotsPerMeterY(int(100. * info->Y_density)); |
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437 } |
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438 |
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439 if (scaledSize.isValid() && scaledSize != clip.size()) { |
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440 *outImage = outImage->scaled(scaledSize, Qt::IgnoreAspectRatio, quality >= HIGH_QUALITY_THRESHOLD ? Qt::SmoothTransformation : Qt::FastTransformation); |
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441 } |
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442 |
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443 if (!scaledClipRect.isEmpty()) |
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444 *outImage = outImage->copy(scaledClipRect); |
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445 return !outImage->isNull(); |
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446 } |
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447 else |
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448 return false; |
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449 } |
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450 |
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451 struct my_jpeg_destination_mgr : public jpeg_destination_mgr { |
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452 // Nothing dynamic - cannot rely on destruction over longjump |
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453 QIODevice *device; |
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454 JOCTET buffer[max_buf]; |
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455 |
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456 public: |
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457 my_jpeg_destination_mgr(QIODevice *); |
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458 }; |
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459 |
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460 |
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461 #if defined(Q_C_CALLBACKS) |
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462 extern "C" { |
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463 #endif |
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464 |
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465 static void qt_init_destination(j_compress_ptr) |
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466 { |
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467 } |
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468 |
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469 static boolean qt_empty_output_buffer(j_compress_ptr cinfo) |
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470 { |
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471 my_jpeg_destination_mgr* dest = (my_jpeg_destination_mgr*)cinfo->dest; |
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472 |
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473 int written = dest->device->write((char*)dest->buffer, max_buf); |
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474 if (written == -1) |
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475 (*cinfo->err->error_exit)((j_common_ptr)cinfo); |
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476 |
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477 dest->next_output_byte = dest->buffer; |
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478 dest->free_in_buffer = max_buf; |
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479 |
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480 #if defined(Q_OS_UNIXWARE) |
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481 return B_TRUE; |
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482 #else |
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483 return true; |
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484 #endif |
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485 } |
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486 |
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487 static void qt_term_destination(j_compress_ptr cinfo) |
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488 { |
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489 my_jpeg_destination_mgr* dest = (my_jpeg_destination_mgr*)cinfo->dest; |
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490 qint64 n = max_buf - dest->free_in_buffer; |
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491 |
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492 qint64 written = dest->device->write((char*)dest->buffer, n); |
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493 if (written == -1) |
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494 (*cinfo->err->error_exit)((j_common_ptr)cinfo); |
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495 } |
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496 |
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497 #if defined(Q_C_CALLBACKS) |
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498 } |
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499 #endif |
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500 |
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501 inline my_jpeg_destination_mgr::my_jpeg_destination_mgr(QIODevice *device) |
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502 { |
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503 jpeg_destination_mgr::init_destination = qt_init_destination; |
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504 jpeg_destination_mgr::empty_output_buffer = qt_empty_output_buffer; |
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505 jpeg_destination_mgr::term_destination = qt_term_destination; |
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506 this->device = device; |
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507 next_output_byte = buffer; |
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508 free_in_buffer = max_buf; |
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509 } |
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510 |
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511 static bool can_write_format(QImage::Format fmt) |
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512 { |
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513 switch (fmt) { |
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514 case QImage::Format_Mono: |
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515 case QImage::Format_MonoLSB: |
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516 case QImage::Format_Indexed8: |
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517 case QImage::Format_RGB888: |
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518 case QImage::Format_RGB32: |
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519 case QImage::Format_ARGB32: |
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520 case QImage::Format_ARGB32_Premultiplied: |
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521 return true; |
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522 break; |
|
523 default: |
|
524 break; |
|
525 } |
|
526 return false; |
|
527 } |
|
528 |
|
529 static bool write_jpeg_image(const QImage &sourceImage, QIODevice *device, int sourceQuality) |
|
530 { |
|
531 bool success = false; |
|
532 const QImage image = can_write_format(sourceImage.format()) ? |
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533 sourceImage : sourceImage.convertToFormat(QImage::Format_RGB888); |
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534 const QVector<QRgb> cmap = image.colorTable(); |
|
535 |
|
536 struct jpeg_compress_struct cinfo; |
|
537 JSAMPROW row_pointer[1]; |
|
538 row_pointer[0] = 0; |
|
539 |
|
540 struct my_jpeg_destination_mgr *iod_dest = new my_jpeg_destination_mgr(device); |
|
541 struct my_error_mgr jerr; |
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542 |
|
543 cinfo.err = jpeg_std_error(&jerr); |
|
544 jerr.error_exit = my_error_exit; |
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545 |
|
546 if (!setjmp(jerr.setjmp_buffer)) { |
|
547 // WARNING: |
|
548 // this if loop is inside a setjmp/longjmp branch |
|
549 // do not create C++ temporaries here because the destructor may never be called |
|
550 // if you allocate memory, make sure that you can free it (row_pointer[0]) |
|
551 jpeg_create_compress(&cinfo); |
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552 |
|
553 cinfo.dest = iod_dest; |
|
554 |
|
555 cinfo.image_width = image.width(); |
|
556 cinfo.image_height = image.height(); |
|
557 |
|
558 bool gray=false; |
|
559 switch (image.format()) { |
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560 case QImage::Format_Mono: |
|
561 case QImage::Format_MonoLSB: |
|
562 case QImage::Format_Indexed8: |
|
563 gray = true; |
|
564 for (int i = image.colorCount(); gray && i--;) { |
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565 gray = gray & (qRed(cmap[i]) == qGreen(cmap[i]) && |
|
566 qRed(cmap[i]) == qBlue(cmap[i])); |
|
567 } |
|
568 cinfo.input_components = gray ? 1 : 3; |
|
569 cinfo.in_color_space = gray ? JCS_GRAYSCALE : JCS_RGB; |
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570 break; |
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571 default: |
|
572 cinfo.input_components = 3; |
|
573 cinfo.in_color_space = JCS_RGB; |
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574 } |
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575 |
|
576 jpeg_set_defaults(&cinfo); |
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577 |
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578 qreal diffInch = qAbs(image.dotsPerMeterX()*2.54/100. - qRound(image.dotsPerMeterX()*2.54/100.)) |
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579 + qAbs(image.dotsPerMeterY()*2.54/100. - qRound(image.dotsPerMeterY()*2.54/100.)); |
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580 qreal diffCm = (qAbs(image.dotsPerMeterX()/100. - qRound(image.dotsPerMeterX()/100.)) |
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581 + qAbs(image.dotsPerMeterY()/100. - qRound(image.dotsPerMeterY()/100.)))*2.54; |
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582 if (diffInch < diffCm) { |
|
583 cinfo.density_unit = 1; // dots/inch |
|
584 cinfo.X_density = qRound(image.dotsPerMeterX()*2.54/100.); |
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585 cinfo.Y_density = qRound(image.dotsPerMeterY()*2.54/100.); |
|
586 } else { |
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587 cinfo.density_unit = 2; // dots/cm |
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588 cinfo.X_density = (image.dotsPerMeterX()+50) / 100; |
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589 cinfo.Y_density = (image.dotsPerMeterY()+50) / 100; |
|
590 } |
|
591 |
|
592 |
|
593 int quality = sourceQuality >= 0 ? qMin(sourceQuality,100) : 75; |
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594 #if defined(Q_OS_UNIXWARE) |
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595 jpeg_set_quality(&cinfo, quality, B_TRUE /* limit to baseline-JPEG values */); |
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596 jpeg_start_compress(&cinfo, B_TRUE); |
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597 #else |
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598 jpeg_set_quality(&cinfo, quality, true /* limit to baseline-JPEG values */); |
|
599 jpeg_start_compress(&cinfo, true); |
|
600 #endif |
|
601 |
|
602 row_pointer[0] = new uchar[cinfo.image_width*cinfo.input_components]; |
|
603 int w = cinfo.image_width; |
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604 while (cinfo.next_scanline < cinfo.image_height) { |
|
605 uchar *row = row_pointer[0]; |
|
606 switch (image.format()) { |
|
607 case QImage::Format_Mono: |
|
608 case QImage::Format_MonoLSB: |
|
609 if (gray) { |
|
610 const uchar* data = image.scanLine(cinfo.next_scanline); |
|
611 if (image.format() == QImage::Format_MonoLSB) { |
|
612 for (int i=0; i<w; i++) { |
|
613 bool bit = !!(*(data + (i >> 3)) & (1 << (i & 7))); |
|
614 row[i] = qRed(cmap[bit]); |
|
615 } |
|
616 } else { |
|
617 for (int i=0; i<w; i++) { |
|
618 bool bit = !!(*(data + (i >> 3)) & (1 << (7 -(i & 7)))); |
|
619 row[i] = qRed(cmap[bit]); |
|
620 } |
|
621 } |
|
622 } else { |
|
623 const uchar* data = image.scanLine(cinfo.next_scanline); |
|
624 if (image.format() == QImage::Format_MonoLSB) { |
|
625 for (int i=0; i<w; i++) { |
|
626 bool bit = !!(*(data + (i >> 3)) & (1 << (i & 7))); |
|
627 *row++ = qRed(cmap[bit]); |
|
628 *row++ = qGreen(cmap[bit]); |
|
629 *row++ = qBlue(cmap[bit]); |
|
630 } |
|
631 } else { |
|
632 for (int i=0; i<w; i++) { |
|
633 bool bit = !!(*(data + (i >> 3)) & (1 << (7 -(i & 7)))); |
|
634 *row++ = qRed(cmap[bit]); |
|
635 *row++ = qGreen(cmap[bit]); |
|
636 *row++ = qBlue(cmap[bit]); |
|
637 } |
|
638 } |
|
639 } |
|
640 break; |
|
641 case QImage::Format_Indexed8: |
|
642 if (gray) { |
|
643 const uchar* pix = image.scanLine(cinfo.next_scanline); |
|
644 for (int i=0; i<w; i++) { |
|
645 *row = qRed(cmap[*pix]); |
|
646 ++row; ++pix; |
|
647 } |
|
648 } else { |
|
649 const uchar* pix = image.scanLine(cinfo.next_scanline); |
|
650 for (int i=0; i<w; i++) { |
|
651 *row++ = qRed(cmap[*pix]); |
|
652 *row++ = qGreen(cmap[*pix]); |
|
653 *row++ = qBlue(cmap[*pix]); |
|
654 ++pix; |
|
655 } |
|
656 } |
|
657 break; |
|
658 case QImage::Format_RGB888: |
|
659 memcpy(row, image.scanLine(cinfo.next_scanline), w * 3); |
|
660 break; |
|
661 case QImage::Format_RGB32: |
|
662 case QImage::Format_ARGB32: |
|
663 case QImage::Format_ARGB32_Premultiplied: { |
|
664 QRgb* rgb = (QRgb*)image.scanLine(cinfo.next_scanline); |
|
665 for (int i=0; i<w; i++) { |
|
666 *row++ = qRed(*rgb); |
|
667 *row++ = qGreen(*rgb); |
|
668 *row++ = qBlue(*rgb); |
|
669 ++rgb; |
|
670 } |
|
671 break; |
|
672 } |
|
673 default: |
|
674 qWarning("QJpegHandler: unable to write image of format %i", |
|
675 image.format()); |
|
676 break; |
|
677 } |
|
678 jpeg_write_scanlines(&cinfo, row_pointer, 1); |
|
679 } |
|
680 |
|
681 jpeg_finish_compress(&cinfo); |
|
682 jpeg_destroy_compress(&cinfo); |
|
683 success = true; |
|
684 } else { |
|
685 jpeg_destroy_compress(&cinfo); |
|
686 success = false; |
|
687 } |
|
688 |
|
689 delete iod_dest; |
|
690 delete [] row_pointer[0]; |
|
691 return success; |
|
692 } |
|
693 |
|
694 class QJpegHandlerPrivate |
|
695 { |
|
696 public: |
|
697 enum State { |
|
698 Ready, |
|
699 ReadHeader, |
|
700 Error |
|
701 }; |
|
702 |
|
703 QJpegHandlerPrivate(QJpegHandler *qq) |
|
704 : quality(75), iod_src(0), state(Ready), q(qq) |
|
705 {} |
|
706 |
|
707 ~QJpegHandlerPrivate() |
|
708 { |
|
709 if(iod_src) |
|
710 { |
|
711 jpeg_destroy_decompress(&info); |
|
712 delete iod_src; |
|
713 iod_src = 0; |
|
714 } |
|
715 } |
|
716 |
|
717 bool readJpegHeader(QIODevice*); |
|
718 bool read(QImage *image); |
|
719 |
|
720 int quality; |
|
721 QVariant size; |
|
722 QImage::Format format; |
|
723 QSize scaledSize; |
|
724 QRect scaledClipRect; |
|
725 QRect clipRect; |
|
726 struct jpeg_decompress_struct info; |
|
727 struct my_jpeg_source_mgr * iod_src; |
|
728 struct my_error_mgr err; |
|
729 |
|
730 State state; |
|
731 |
|
732 QJpegHandler *q; |
|
733 }; |
|
734 |
|
735 /*! |
|
736 \internal |
|
737 */ |
|
738 bool QJpegHandlerPrivate::readJpegHeader(QIODevice *device) |
|
739 { |
|
740 if(state == Ready) |
|
741 { |
|
742 state = Error; |
|
743 iod_src = new my_jpeg_source_mgr(device); |
|
744 |
|
745 jpeg_create_decompress(&info); |
|
746 info.src = iod_src; |
|
747 info.err = jpeg_std_error(&err); |
|
748 err.error_exit = my_error_exit; |
|
749 |
|
750 if (!setjmp(err.setjmp_buffer)) { |
|
751 #if defined(Q_OS_UNIXWARE) |
|
752 (void) jpeg_read_header(&info, B_TRUE); |
|
753 #else |
|
754 (void) jpeg_read_header(&info, true); |
|
755 #endif |
|
756 |
|
757 int width = 0; |
|
758 int height = 0; |
|
759 read_jpeg_size(width, height, &info); |
|
760 size = QSize(width, height); |
|
761 |
|
762 format = QImage::Format_Invalid; |
|
763 read_jpeg_format(format, &info); |
|
764 state = ReadHeader; |
|
765 return true; |
|
766 } |
|
767 else |
|
768 { |
|
769 return false; |
|
770 } |
|
771 } |
|
772 else if(state == Error) |
|
773 return false; |
|
774 return true; |
|
775 } |
|
776 |
|
777 bool QJpegHandlerPrivate::read(QImage *image) |
|
778 { |
|
779 if(state == Ready) |
|
780 readJpegHeader(q->device()); |
|
781 |
|
782 if(state == ReadHeader) |
|
783 { |
|
784 bool success = read_jpeg_image(image, scaledSize, scaledClipRect, clipRect, quality, &info, &err); |
|
785 state = success ? Ready : Error; |
|
786 return success; |
|
787 } |
|
788 |
|
789 return false; |
|
790 |
|
791 } |
|
792 |
|
793 QJpegHandler::QJpegHandler() |
|
794 : d(new QJpegHandlerPrivate(this)) |
|
795 { |
|
796 } |
|
797 |
|
798 QJpegHandler::~QJpegHandler() |
|
799 { |
|
800 delete d; |
|
801 } |
|
802 |
|
803 bool QJpegHandler::canRead() const |
|
804 { |
|
805 if(d->state == QJpegHandlerPrivate::Ready && !canRead(device())) |
|
806 return false; |
|
807 |
|
808 if (d->state != QJpegHandlerPrivate::Error) { |
|
809 setFormat("jpeg"); |
|
810 return true; |
|
811 } |
|
812 |
|
813 return false; |
|
814 } |
|
815 |
|
816 bool QJpegHandler::canRead(QIODevice *device) |
|
817 { |
|
818 if (!device) { |
|
819 qWarning("QJpegHandler::canRead() called with no device"); |
|
820 return false; |
|
821 } |
|
822 |
|
823 char buffer[2]; |
|
824 if (device->peek(buffer, 2) != 2) |
|
825 return false; |
|
826 return uchar(buffer[0]) == 0xff && uchar(buffer[1]) == 0xd8; |
|
827 } |
|
828 |
|
829 bool QJpegHandler::read(QImage *image) |
|
830 { |
|
831 if (!canRead()) |
|
832 return false; |
|
833 return d->read(image); |
|
834 } |
|
835 |
|
836 bool QJpegHandler::write(const QImage &image) |
|
837 { |
|
838 return write_jpeg_image(image, device(), d->quality); |
|
839 } |
|
840 |
|
841 bool QJpegHandler::supportsOption(ImageOption option) const |
|
842 { |
|
843 return option == Quality |
|
844 || option == ScaledSize |
|
845 || option == ScaledClipRect |
|
846 || option == ClipRect |
|
847 || option == Size |
|
848 || option == ImageFormat; |
|
849 } |
|
850 |
|
851 QVariant QJpegHandler::option(ImageOption option) const |
|
852 { |
|
853 switch(option) { |
|
854 case Quality: |
|
855 return d->quality; |
|
856 case ScaledSize: |
|
857 return d->scaledSize; |
|
858 case ScaledClipRect: |
|
859 return d->scaledClipRect; |
|
860 case ClipRect: |
|
861 return d->clipRect; |
|
862 case Size: |
|
863 d->readJpegHeader(device()); |
|
864 return d->size; |
|
865 case ImageFormat: |
|
866 d->readJpegHeader(device()); |
|
867 return d->format; |
|
868 default: |
|
869 return QVariant(); |
|
870 } |
|
871 } |
|
872 |
|
873 void QJpegHandler::setOption(ImageOption option, const QVariant &value) |
|
874 { |
|
875 switch(option) { |
|
876 case Quality: |
|
877 d->quality = value.toInt(); |
|
878 break; |
|
879 case ScaledSize: |
|
880 d->scaledSize = value.toSize(); |
|
881 break; |
|
882 case ScaledClipRect: |
|
883 d->scaledClipRect = value.toRect(); |
|
884 break; |
|
885 case ClipRect: |
|
886 d->clipRect = value.toRect(); |
|
887 break; |
|
888 default: |
|
889 break; |
|
890 } |
|
891 } |
|
892 |
|
893 QByteArray QJpegHandler::name() const |
|
894 { |
|
895 return "jpeg"; |
|
896 } |
|
897 |
|
898 |
|
899 |
|
900 |
|
901 QT_END_NAMESPACE |