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@@ -1,164 +1,160 b'' | |||
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1 | 1 | # -*- encoding: utf-8 -*- |
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2 | 2 | """ |
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3 | 3 | django-thumbs by Antonio Melé |
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4 | 4 | http://django.es |
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5 | 5 | """ |
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6 | 6 | from django.db.models import ImageField |
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7 | 7 | from django.db.models.fields.files import ImageFieldFile |
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8 | 8 | from PIL import Image |
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9 | 9 | from django.core.files.base import ContentFile |
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10 | 10 | import cStringIO |
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11 | 11 | |
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12 | 12 | def generate_thumb(img, thumb_size, format): |
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13 | 13 | """ |
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14 | 14 | Generates a thumbnail image and returns a ContentFile object with the thumbnail |
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15 | 15 | |
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16 | 16 | Parameters: |
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17 | 17 | =========== |
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18 | 18 | img File object |
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19 | 19 | |
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20 | 20 | thumb_size desired thumbnail size, ie: (200,120) |
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21 | 21 | |
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22 | 22 | format format of the original image ('jpeg','gif','png',...) |
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23 | 23 | (this format will be used for the generated thumbnail, too) |
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24 | 24 | """ |
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25 | 25 | |
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26 | 26 | img.seek(0) # see http://code.djangoproject.com/ticket/8222 for details |
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27 | 27 | image = Image.open(img) |
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28 | 28 | |
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29 | # Convert to RGB if necessary | |
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30 | if image.mode not in ('L', 'RGB'): | |
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31 | image = image.convert('RGB') | |
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32 | ||
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33 | 29 | # get size |
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34 | 30 | thumb_w, thumb_h = thumb_size |
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35 | 31 | # If you want to generate a square thumbnail |
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36 | 32 | if thumb_w == thumb_h: |
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37 | 33 | # quad |
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38 | 34 | xsize, ysize = image.size |
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39 | 35 | # get minimum size |
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40 | 36 | minsize = min(xsize,ysize) |
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41 | 37 | # largest square possible in the image |
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42 | 38 | xnewsize = (xsize-minsize)/2 |
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43 | 39 | ynewsize = (ysize-minsize)/2 |
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44 | 40 | # crop it |
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45 | 41 | image2 = image.crop((xnewsize, ynewsize, xsize-xnewsize, ysize-ynewsize)) |
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46 | 42 | # load is necessary after crop |
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47 | 43 | image2.load() |
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48 | 44 | # thumbnail of the cropped image (with ANTIALIAS to make it look better) |
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49 | 45 | image2.thumbnail(thumb_size, Image.ANTIALIAS) |
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50 | 46 | else: |
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51 | 47 | # not quad |
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52 | 48 | image2 = image |
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53 | 49 | image2.thumbnail(thumb_size, Image.ANTIALIAS) |
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54 | 50 | |
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55 | 51 | io = cStringIO.StringIO() |
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56 | 52 | # PNG and GIF are the same, JPG is JPEG |
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57 | 53 | if format.upper()=='JPG': |
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58 | 54 | format = 'JPEG' |
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59 | 55 | |
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60 | 56 | image2.save(io, format) |
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61 | 57 | return ContentFile(io.getvalue()) |
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62 | 58 | |
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63 | 59 | class ImageWithThumbsFieldFile(ImageFieldFile): |
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64 | 60 | """ |
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65 | 61 | See ImageWithThumbsField for usage example |
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66 | 62 | """ |
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67 | 63 | def __init__(self, *args, **kwargs): |
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68 | 64 | super(ImageWithThumbsFieldFile, self).__init__(*args, **kwargs) |
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69 | 65 | self.sizes = self.field.sizes |
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70 | 66 | |
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71 | 67 | if self.sizes: |
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72 | 68 | def get_size(self, size): |
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73 | 69 | if not self: |
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74 | 70 | return '' |
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75 | 71 | else: |
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76 | 72 | split = self.url.rsplit('.',1) |
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77 | 73 | thumb_url = '%s.%sx%s.%s' % (split[0],w,h,split[1]) |
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78 | 74 | return thumb_url |
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79 | 75 | |
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80 | 76 | for size in self.sizes: |
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81 | 77 | (w,h) = size |
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82 | 78 | setattr(self, 'url_%sx%s' % (w,h), get_size(self, size)) |
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83 | 79 | |
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84 | 80 | def save(self, name, content, save=True): |
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85 | 81 | super(ImageWithThumbsFieldFile, self).save(name, content, save) |
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86 | 82 | |
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87 | 83 | if self.sizes: |
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88 | 84 | for size in self.sizes: |
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89 | 85 | (w,h) = size |
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90 | 86 | split = self.name.rsplit('.',1) |
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91 | 87 | thumb_name = '%s.%sx%s.%s' % (split[0],w,h,split[1]) |
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92 | 88 | |
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93 | 89 | # you can use another thumbnailing function if you like |
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94 | 90 | thumb_content = generate_thumb(content, size, split[1]) |
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95 | 91 | |
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96 | 92 | thumb_name_ = self.storage.save(thumb_name, thumb_content) |
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97 | 93 | |
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98 | 94 | if not thumb_name == thumb_name_: |
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99 | 95 | raise ValueError('There is already a file named %s' % thumb_name) |
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100 | 96 | |
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101 | 97 | def delete(self, save=True): |
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102 | 98 | name=self.name |
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103 | 99 | super(ImageWithThumbsFieldFile, self).delete(save) |
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104 | 100 | if self.sizes: |
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105 | 101 | for size in self.sizes: |
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106 | 102 | (w,h) = size |
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107 | 103 | split = name.rsplit('.',1) |
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108 | 104 | thumb_name = '%s.%sx%s.%s' % (split[0],w,h,split[1]) |
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109 | 105 | try: |
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110 | 106 | self.storage.delete(thumb_name) |
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111 | 107 | except: |
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112 | 108 | pass |
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113 | 109 | |
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114 | 110 | class ImageWithThumbsField(ImageField): |
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115 | 111 | attr_class = ImageWithThumbsFieldFile |
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116 | 112 | """ |
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117 | 113 | Usage example: |
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118 | 114 | ============== |
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119 | 115 | photo = ImageWithThumbsField(upload_to='images', sizes=((125,125),(300,200),) |
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120 | 116 | |
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121 | 117 | To retrieve image URL, exactly the same way as with ImageField: |
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122 | 118 | my_object.photo.url |
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123 | 119 | To retrieve thumbnails URL's just add the size to it: |
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124 | 120 | my_object.photo.url_125x125 |
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125 | 121 | my_object.photo.url_300x200 |
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126 | 122 | |
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127 | 123 | Note: The 'sizes' attribute is not required. If you don't provide it, |
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128 | 124 | ImageWithThumbsField will act as a normal ImageField |
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129 | 125 | |
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130 | 126 | How it works: |
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131 | 127 | ============= |
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132 | 128 | For each size in the 'sizes' atribute of the field it generates a |
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133 | 129 | thumbnail with that size and stores it following this format: |
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134 | 130 | |
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135 | 131 | available_filename.[width]x[height].extension |
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136 | 132 | |
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137 | 133 | Where 'available_filename' is the available filename returned by the storage |
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138 | 134 | backend for saving the original file. |
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139 | 135 | |
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140 | 136 | Following the usage example above: For storing a file called "photo.jpg" it saves: |
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141 | 137 | photo.jpg (original file) |
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142 | 138 | photo.125x125.jpg (first thumbnail) |
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143 | 139 | photo.300x200.jpg (second thumbnail) |
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144 | 140 | |
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145 | 141 | With the default storage backend if photo.jpg already exists it will use these filenames: |
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146 | 142 | photo_.jpg |
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147 | 143 | photo_.125x125.jpg |
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148 | 144 | photo_.300x200.jpg |
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149 | 145 | |
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150 | 146 | Note: django-thumbs assumes that if filename "any_filename.jpg" is available |
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151 | 147 | filenames with this format "any_filename.[widht]x[height].jpg" will be available, too. |
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152 | 148 | |
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153 | 149 | To do: |
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154 | 150 | ====== |
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155 | 151 | Add method to regenerate thubmnails |
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156 | 152 | |
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157 | 153 | """ |
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158 | 154 | def __init__(self, verbose_name=None, name=None, width_field=None, height_field=None, sizes=None, **kwargs): |
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159 | 155 | self.verbose_name=verbose_name |
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160 | 156 | self.name=name |
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161 | 157 | self.width_field=width_field |
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162 | 158 | self.height_field=height_field |
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163 | 159 | self.sizes = sizes |
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164 | 160 | super(ImageField, self).__init__(**kwargs) No newline at end of file |
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