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annotate sat/tools/image.py @ 3285:4240b44842bb

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core: getLocalPath now returns a Path
author Goffi <goffi@goffi.org>
date Fri, 29 May 2020 21:02:20 +0200
parents f300d78f08f3
children 1512cbd6c4ac
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/env python3
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2
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3 # SàT: an XMPP client
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4 # Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org)
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5
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6 # This program is free software: you can redistribute it and/or modify
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7 # it under the terms of the GNU Affero General Public License as published by
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8 # the Free Software Foundation, either version 3 of the License, or
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9 # (at your option) any later version.
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10
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11 # This program is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU Affero General Public License for more details.
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15
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16 # You should have received a copy of the GNU Affero General Public License
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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18
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19 """Methods to manipulate images"""
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20
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21 import tempfile
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22 import mimetypes
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23 from PIL import Image
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24 from pathlib import Path
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25 from twisted.internet import threads
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26 from sat.core.i18n import _
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27 from sat.core import exceptions
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28 from sat.core.log import getLogger
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29
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30 log = getLogger(__name__)
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31
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32 try:
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33 import cairosvg
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34 except Exception as e:
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35 log.warning(_("SVG support not available, please install cairosvg: {e}").format(
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36 e=e))
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37 cairosvg = None
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38
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39
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40 def check(host, path, max_size=None):
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41 """Analyze image and return a report
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42
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43 report will indicate if image is too large, and the recommended new size if this is
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44 the case
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45 @param host: SàT instance
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46 @param path(str, pathlib.Path): image to open
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47 @param max_size(tuple[int, int]): maximum accepted size of image
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48 None to use value set in config
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49 @return dict: report on image, with following keys:
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50 - too_large: true if image is oversized
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51 - recommended_size: if too_large is True, recommended size to use
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52 """
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53 report = {}
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54 image = Image.open(path)
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55 if max_size is None:
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56 max_size = tuple(host.memory.getConfig(None, "image_max", (1200, 720)))
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57 if image.size > max_size:
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58 report['too_large'] = True
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59 if image.size[0] > max_size[0]:
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60 factor = max_size[0] / image.size[0]
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61 if image.size[1] * factor > max_size[1]:
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62 factor = max_size[1] / image.size[1]
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63 else:
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64 factor = max_size[1] / image.size[1]
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65 report['recommended_size'] = [int(image.width*factor), int(image.height*factor)]
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66 else:
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67 report['too_large'] = False
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68
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69 return report
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70
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71
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72 def _resizeBlocking(image_path, new_size, dest):
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73 im_path = Path(image_path)
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74 im = Image.open(im_path)
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75 resized = im.resize(new_size, Image.LANCZOS)
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76
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77 if dest is None:
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78 dest = tempfile.NamedTemporaryFile(suffix=im_path.suffix, delete=False)
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79 elif isinstance(dest, Path):
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80 dest = dest.open('wb')
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81
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82 with dest as f:
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83 resized.save(f, format=im.format)
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84
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85 return Path(f.name)
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86
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87
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88 def resize(image_path, new_size, dest=None):
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89 """Resize an image to a new file, and return its path
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90
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91 @param image_path(str, Path): path of the original image
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92 @param new_size(tuple[int, int]): size to use for new image
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93 @param dest(None, Path, file): where the resized image must be stored, can be:
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94 - None: use a temporary file
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95 file will be converted to PNG
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96 - Path: path to the file to create/overwrite
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97 - file: a file object which must be opened for writing in binary mode
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98 @return (Path): path of the resized file.
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99 The image at this path should be deleted after use
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100 """
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101 return threads.deferToThread(_resizeBlocking, image_path, new_size, dest)
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102
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103
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104 def _convertBlocking(image_path, dest, extra):
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105 media_type = mimetypes.guess_type(str(image_path), strict=False)[0]
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106
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107 if dest is None:
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108 dest = tempfile.NamedTemporaryFile(suffix=".png", delete=False)
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109 filepath = Path(dest.name)
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110 elif isinstance(dest, Path):
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111 filepath = dest
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112 else:
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113 # we should have a file-like object
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114 try:
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115 name = dest.name
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116 except AttributeError:
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117 name = None
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118 if name:
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119 try:
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120 filepath = Path(name)
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121 except TypeError:
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122 filepath = Path('noname.png')
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123 else:
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124 filepath = Path('noname.png')
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125
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126 if media_type == "image/svg+xml":
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127 if cairosvg is None:
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128 raise exceptions.MissingModule(
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129 f"Can't convert SVG image at {image_path} due to missing CairoSVG module")
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130 width, height = extra.get('width'), extra.get('height')
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131 cairosvg.svg2png(
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132 url=str(image_path), write_to=dest,
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133 output_width=width, output_height=height
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134 )
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135 else:
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136 suffix = filepath.suffix
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137 if not suffix:
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138 raise ValueError(
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139 "A suffix is missing for destination, it is needed to determine file "
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140 "format")
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141 if not suffix in Image.EXTENSION:
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142 Image.init()
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143 try:
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144 im_format = Image.EXTENSION[suffix]
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145 except KeyError:
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146 raise ValueError(
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147 "Dest image format can't be determined, {suffix!r} suffix is unknown"
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148 )
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149 im = Image.open(image_path)
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150 im.save(dest, format=im_format)
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151
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152 log.debug(f"image {image_path} has been converted to {filepath}")
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153 return filepath
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154
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155
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156 def convert(image_path, dest=None, extra=None):
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157 """Convert an image to a new file, and return its path
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158
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159 @param image_path(str, Path): path of the image to convert
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160 @param dest(None, Path, file): where the converted image must be stored, can be:
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161 - None: use a temporary file
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162 - Path: path to the file to create/overwrite
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163 - file: a file object which must be opened for writing in binary mode
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164 @param extra(None, dict): conversion options
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165 if image_path link to a SVG file, following options can be used:
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166 - width: destination width
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167 - height: destination height
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168 @return (Path): path of the converted file.
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169 a generic name is used if dest is an unnamed file like object
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170 """
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171 image_path = Path(image_path)
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172 if not image_path.is_file():
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173 raise ValueError(f"There is no file at {image_path}!")
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174 if extra is None:
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175 extra = {}
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176 return threads.deferToThread(_convertBlocking, image_path, dest, extra)
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177
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178
3252
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Goffi <goffi@goffi.org>
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179 def guess_type(source):
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180 """Guess image media type
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181
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182 @param source(str, Path, file): image to guess type
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183 @return (str, None): media type, or None if we can't guess
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184 """
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185 if isinstance(source, str):
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186 source = Path(source)
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187
54934ee3f69c tools (image): added a guess_type method to guess media type:
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188 if isinstance(source, Path):
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189 # we first try to guess from file name
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190 media_type = mimetypes.guess_type(source, strict=False)[0]
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Goffi <goffi@goffi.org>
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diff changeset
191 if media_type is not None:
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diff changeset
192 return media_type
54934ee3f69c tools (image): added a guess_type method to guess media type:
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diff changeset
193
54934ee3f69c tools (image): added a guess_type method to guess media type:
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diff changeset
194 # file name is not enough, we try to open it
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Goffi <goffi@goffi.org>
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diff changeset
195 img = Image.open(source)
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Goffi <goffi@goffi.org>
parents: 3220
diff changeset
196 try:
54934ee3f69c tools (image): added a guess_type method to guess media type:
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diff changeset
197 return Image.MIME[img.format]
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Goffi <goffi@goffi.org>
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diff changeset
198 except KeyError:
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Goffi <goffi@goffi.org>
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199 return None