dupeguru/qt/pe/photo.py

# Copyright 2016 Hardcoded Software (http://www.hardcoded.net)
#
# This software is licensed under the "GPLv3" License as described in the "LICENSE" file,
# which should be included with this package. The terms are also available at
# http://www.gnu.org/licenses/gpl-3.0.html

import logging

from PyQt5.QtGui import QImage, QImageReader, QTransform

from core.pe.photo import Photo as PhotoBase

from .block import getblocks


class File(PhotoBase):
    def _plat_get_dimensions(self):
        try:
            ir = QImageReader(str(self.path))
            size = ir.size()
            if size.isValid():
                return (size.width(), size.height())
            else:
                return (0, 0)
        except EnvironmentError:
            logging.warning("Could not read image '%s'", str(self.path))
            return (0, 0)

    def _plat_get_blocks(self, block_count_per_side, orientation):
        image = QImage(str(self.path))
        image = image.convertToFormat(QImage.Format_RGB888)
        if type(orientation) == str:
            logging.warning("Orientation for file '%s' was a str '%s', not an int.",
                            str(self.path), orientation)
            try:
                orientation = int(orientation)
            except Exception as e:
                logging.exception("Skipping transformation because could not \
convert str to int. %s", e)
                return getblocks(image, block_count_per_side)
        # MYSTERY TO SOLVE: For reasons I cannot explain, orientations 5 and 7 don't work for
        # duplicate scanning. The transforms seems to work fine (if I try to save the image after
        # the transform, we see that the image has been correctly flipped and rotated), but the
        # analysis part yields wrong blocks. I spent enought time with this feature, so I'll leave
        # like that for now. (by the way, orientations 5 and 7 work fine under Cocoa)
        if 2 <= orientation <= 8:
            t = QTransform()
            if orientation == 2:
                t.scale(-1, 1)
            elif orientation == 3:
                t.rotate(180)
            elif orientation == 4:
                t.scale(1, -1)
            elif orientation == 5:
                t.scale(-1, 1)
                t.rotate(90)
            elif orientation == 6:
                t.rotate(90)
            elif orientation == 7:
                t.scale(-1, 1)
                t.rotate(270)
            elif orientation == 8:
                t.rotate(270)
            image = image.transformed(t)
        return getblocks(image, block_count_per_side)