From e472383acbb9e07dca311abe5fb16ee2675e410a Mon Sep 17 00:00:00 2001
From: Aarni Koskela <akx@iki.fi>
Date: Wed, 27 Dec 2023 11:04:33 +0200
Subject: Refactor esrgan_upscale to more generic upscale_with_model

---
 modules/esrgan_model.py   | 47 ++++++---------------------------
 modules/upscaler_utils.py | 66 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+), 39 deletions(-)
 create mode 100644 modules/upscaler_utils.py

diff --git a/modules/esrgan_model.py b/modules/esrgan_model.py
index 02a1727d..c0d22a99 100644
--- a/modules/esrgan_model.py
+++ b/modules/esrgan_model.py
@@ -1,13 +1,12 @@
 import sys
 
-import numpy as np
 import torch
-from PIL import Image
 
 import modules.esrgan_model_arch as arch
-from modules import modelloader, images, devices
+from modules import modelloader, devices
 from modules.shared import opts
 from modules.upscaler import Upscaler, UpscalerData
+from modules.upscaler_utils import upscale_with_model
 
 
 def mod2normal(state_dict):
@@ -190,40 +189,10 @@ class UpscalerESRGAN(Upscaler):
         return model
 
 
-def upscale_without_tiling(model, img):
-    img = np.array(img)
-    img = img[:, :, ::-1]
-    img = np.ascontiguousarray(np.transpose(img, (2, 0, 1))) / 255
-    img = torch.from_numpy(img).float()
-    img = img.unsqueeze(0).to(devices.device_esrgan)
-    with torch.no_grad():
-        output = model(img)
-    output = output.squeeze().float().cpu().clamp_(0, 1).numpy()
-    output = 255. * np.moveaxis(output, 0, 2)
-    output = output.astype(np.uint8)
-    output = output[:, :, ::-1]
-    return Image.fromarray(output, 'RGB')
-
-
 def esrgan_upscale(model, img):
-    if opts.ESRGAN_tile == 0:
-        return upscale_without_tiling(model, img)
-
-    grid = images.split_grid(img, opts.ESRGAN_tile, opts.ESRGAN_tile, opts.ESRGAN_tile_overlap)
-    newtiles = []
-    scale_factor = 1
-
-    for y, h, row in grid.tiles:
-        newrow = []
-        for tiledata in row:
-            x, w, tile = tiledata
-
-            output = upscale_without_tiling(model, tile)
-            scale_factor = output.width // tile.width
-
-            newrow.append([x * scale_factor, w * scale_factor, output])
-        newtiles.append([y * scale_factor, h * scale_factor, newrow])
-
-    newgrid = images.Grid(newtiles, grid.tile_w * scale_factor, grid.tile_h * scale_factor, grid.image_w * scale_factor, grid.image_h * scale_factor, grid.overlap * scale_factor)
-    output = images.combine_grid(newgrid)
-    return output
+    return upscale_with_model(
+        model,
+        img,
+        tile_size=opts.ESRGAN_tile,
+        tile_overlap=opts.ESRGAN_tile_overlap,
+    )
diff --git a/modules/upscaler_utils.py b/modules/upscaler_utils.py
new file mode 100644
index 00000000..8bdda51c
--- /dev/null
+++ b/modules/upscaler_utils.py
@@ -0,0 +1,66 @@
+import logging
+from typing import Callable
+
+import numpy as np
+import torch
+import tqdm
+from PIL import Image
+
+from modules import devices, images
+
+logger = logging.getLogger(__name__)
+
+
+def upscale_without_tiling(model, img: Image.Image):
+    img = np.array(img)
+    img = img[:, :, ::-1]
+    img = np.ascontiguousarray(np.transpose(img, (2, 0, 1))) / 255
+    img = torch.from_numpy(img).float()
+    img = img.unsqueeze(0).to(devices.device_esrgan)
+    with torch.no_grad():
+        output = model(img)
+    output = output.squeeze().float().cpu().clamp_(0, 1).numpy()
+    output = 255. * np.moveaxis(output, 0, 2)
+    output = output.astype(np.uint8)
+    output = output[:, :, ::-1]
+    return Image.fromarray(output, 'RGB')
+
+
+def upscale_with_model(
+    model: Callable[[torch.Tensor], torch.Tensor],
+    img: Image.Image,
+    *,
+    tile_size: int,
+    tile_overlap: int = 0,
+    desc="tiled upscale",
+) -> Image.Image:
+    if tile_size <= 0:
+        logger.debug("Upscaling %s without tiling", img)
+        output = upscale_without_tiling(model, img)
+        logger.debug("=> %s", output)
+        return output
+
+    grid = images.split_grid(img, tile_size, tile_size, tile_overlap)
+    newtiles = []
+
+    with tqdm.tqdm(total=grid.tile_count, desc=desc) as p:
+        for y, h, row in grid.tiles:
+            newrow = []
+            for x, w, tile in row:
+                logger.debug("Tile (%d, %d) %s...", x, y, tile)
+                output = upscale_without_tiling(model, tile)
+                scale_factor = output.width // tile.width
+                logger.debug("=> %s (scale factor %s)", output, scale_factor)
+                newrow.append([x * scale_factor, w * scale_factor, output])
+                p.update(1)
+            newtiles.append([y * scale_factor, h * scale_factor, newrow])
+
+    newgrid = images.Grid(
+        newtiles,
+        tile_w=grid.tile_w * scale_factor,
+        tile_h=grid.tile_h * scale_factor,
+        image_w=grid.image_w * scale_factor,
+        image_h=grid.image_h * scale_factor,
+        overlap=grid.overlap * scale_factor,
+    )
+    return images.combine_grid(newgrid)
-- 
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