diff options
Diffstat (limited to 'postgresqleu/util/fields.py')
| -rw-r--r-- | postgresqleu/util/fields.py | 41 |
1 files changed, 33 insertions, 8 deletions
diff --git a/postgresqleu/util/fields.py b/postgresqleu/util/fields.py index ae41061a..88b381b0 100644 --- a/postgresqleu/util/fields.py +++ b/postgresqleu/util/fields.py @@ -2,7 +2,9 @@ from django.db import models from django.core.exceptions import ValidationError from .forms import ImageBinaryFormField, PdfBinaryFormField -from PIL import ImageFile +import io + +from PIL import Image, ImageFile from postgresqleu.util.magic import magicdb @@ -19,7 +21,8 @@ class ImageBinaryField(models.Field): empty_values = [None, b''] def __init__(self, max_length, *args, **kwargs): - self.max_resolution = kwargs.pop('max_resolution', None) + self.resolution = kwargs.pop('resolution', None) + self.auto_scale = kwargs.pop('auto_scale', False) super(ImageBinaryField, self).__init__(*args, **kwargs) self.max_length = max_length @@ -65,12 +68,34 @@ class ImageBinaryField(models.Field): except Exception as e: raise ValidationError("Could not parse image: %s" % e) - if img.format.upper() != 'JPEG': - raise ValidationError("Only JPEG files are allowed") - - if self.max_resolution: - if img.size[0] > self.max_resolution[0] or img.size[1] > self.max_resolution[1]: - raise ValidationError("Maximum image size is {}x{}".format(*self.max_resolution)) + if img.format.upper() not in ('JPEG', 'PNG'): + raise ValidationError("Only JPEG or PNG files are allowed") + + if self.resolution: + if img.size[0] != self.resolution[0] or img.size[1] != self.resolution[1]: + if self.auto_scale: + scale = min( + float(self.resolution[0]) / float(img.size[0]), + float(self.resolution[1]) / float(img.size[1]), + ) + newimg = img.resize( + (int(img.size[0] * scale), int(img.size[1] * scale)), + Image.BICUBIC, + ) + saver = io.BytesIO() + if newimg.size[0] != newimg.size[1]: + # This is not a square, so we have to roll it again + centeredimg = Image.new('RGBA', self.resolution) + centeredimg.paste(newimg, ( + (self.resolution[0] - newimg.size[0]) // 2, + (self.resolution[1] - newimg.size[1]) // 2, + )) + centeredimg.save(saver, format='PNG') + else: + newimg.save(saver, format="PNG") + value = saver.getvalue() + else: + raise ValidationError("Image size must be {}x{}".format(*self.resolution)) return value |