src/frontend/gui/upscaler_widget.py

from PIL import Image
from PyQt5.QtWidgets import (
    QApplication,
    QHBoxLayout,
    QRadioButton,
    QWidget,
)

from app_settings import AppSettings
from backend.models.upscale import UpscaleMode
from backend.upscale.upscaler import upscale_image
from frontend.gui.img2img_widget import Img2ImgWidget
from paths import FastStableDiffusionPaths


class UpscalerWidget(Img2ImgWidget):
    scale_factor = 2.0

    def __init__(self, config: AppSettings, parent):
        super().__init__(config, parent)
        # Hide prompt and negative prompt widgets
        self.prompt.hide()
        self.neg_prompt.hide()
        # self.neg_prompt.deleteLater()
        self.strength_label.hide()
        self.strength.hide()
        self.generate.setText("Upscale")
        # Create upscaler widgets
        self.edsr_button = QRadioButton("EDSR", self)
        self.edsr_button.toggled.connect(self.on_mode_change)
        self.edsr_button.toggle()
        self.sd_button = QRadioButton("SD", self)
        self.sd_button.toggled.connect(self.on_mode_change)
        self.aura_button = QRadioButton("AURA-SR", self)
        self.aura_button.toggled.connect(self.on_mode_change)

        self.neg_prompt_label.setText("Upscale mode (2x) | AURA-SR (4x):")
        # Create upscaler buttons layout
        hlayout = QHBoxLayout()
        hlayout.addWidget(self.edsr_button)
        hlayout.addWidget(self.sd_button)
        hlayout.addWidget(self.aura_button)
        # Can't use a layout with replaceWidget(), so the layout is assigned
        # to a dummy widget used to replace the negative prompt button and
        # obtain the desired GUI design
        self.container = QWidget()
        self.container.setLayout(hlayout)
        self.layout().replaceWidget(self.neg_prompt, self.container)

    def generate_image(self):
        self.parent.prepare_generation_settings(self.config)
        self.config.settings.lcm_diffusion_setting.init_image = Image.open(
            self.img_path.text()
        )
        self.config.settings.lcm_diffusion_setting.strength = self.strength.value() / 10
        upscaled_filepath = FastStableDiffusionPaths.get_upscale_filepath(
            None,
            self.scale_factor,
            self.config.settings.generated_images.format,
        )

        images = upscale_image(
            context=self.parent.context,
            src_image_path=self.img_path.text(),
            dst_image_path=upscaled_filepath,
            upscale_mode=self.upscale_mode,
            strength=0.1,
        )
        self.prepare_images(images)
        self.after_generation()

    def before_generation(self):
        super().before_generation()
        self.container.setEnabled(False)

    def after_generation(self):
        super().after_generation()
        self.container.setEnabled(True)
        # TODO For some reason, if init_image is not set to None, saving settings
        # when closing the main window will fail, even though the save() method
        # explicitly sets init_image to None?
        self.config.settings.lcm_diffusion_setting.init_image = None

    def on_mode_change(self):
        self.scale_factor = 2.0
        if self.edsr_button.isChecked():
            self.upscale_mode = UpscaleMode.normal.value
        elif self.sd_button.isChecked():
            self.upscale_mode = UpscaleMode.sd_upscale.value
        else:
            self.upscale_mode = UpscaleMode.aura_sr.value
            self.scale_factor = 4.0