custom thumbnailer not working
- From: Roderick MacKenzie <r c i mackenzie googlemail com>
- To: nautilus-list gnome org
- Subject: custom thumbnailer not working
- Date: Tue, 30 Oct 2018 21:50:13 +0000
Hi,
I've been trying to write a custom thumbnailer for nautilus and I
can't understand why it is not working. I am wondering if there is a
bug preventing it from working, can any body help me please :)
I added:
[Thumbnailer Entry]
TryExec=/full/path/to/my/script.py
Exec=/full/path/to/my/script.py %s %u %o
MimeType=application/gpvdm;
to the file:
/usr/share/thumbnailers/gpvdm.thumbnailer
/full/path/to/my/script.py looks like this, which generates a
rectangle full of random colors:
#!/usr/bin/env python3
import os
import sys
import math
import cairo
import shutil
from PIL import Image
from io import BytesIO
from PIL import ImageDraw
import random
def gen_icon(path,icon_size):
image = Image.new('RGBA',(icon_size,icon_size))
draw = ImageDraw.Draw(image)
for x in range(0,64):
for y in range(0,64):
r = random.randrange(255)
g = random.randrange(255)
b = random.randrange(255)
a = random.randrange(255)
draw.rectangle((x,y,x+1,y+1),fill=(r,g,b,a))
image.save(path, "PNG")
if __name__ == '__main__':
if len(sys.argv)>1:
image_size=sys.argv[1]
input_file=sys.argv[2]
output_file=sys.argv[3]
gen_icon(output_file,int(image_size))
sys.exit(0)
When I refresh nutilus, the script spits out a correct looking thumbnail into:
/home/rod/.cache/thumbnails/large
I get no /home/rod/.cache/thumbnails/fail directory... so far so good.
BUT the thumbnail does not show in nautilus, no matter how many times
I refresh the window or close it/kill nautilus ect.... However when I
open up the thumbnail in gimp and click export to over write the
thumbnail, then refresh nautilus, the thumbnail suddenly appears in
nautilus. I've used 'identify -verbose' to examine a working png
thumbnail generated by a non custom thumbnailer and one generated from
my program and the output looks identical namely:
Properties:
date:create: 2018-10-30T21:22:53+00:00
date:modify: 2018-10-30T21:22:53+00:00
png:IHDR.bit-depth-orig: 8
png:IHDR.bit_depth: 8
png:IHDR.color-type-orig: 6
png:IHDR.color_type: 6 (RGBA)
png:IHDR.interlace_method: 0 (Not interlaced)
png:IHDR.width,height: 256, 256
png:sRGB: intent=0 (Perceptual Intent)
png:text: 3 tEXt/zTXt/iTXt chunks were found
signature: 5adf30d72e1ba683c7c21c25fb44926d73f23fc4e18b719db5187ac4c362b265
Software: GNOME::ThumbnailFactory
Thumb::MTime: 1534174655
So, my question is, what is the difference between the png image I am
generating (which does not work) and the png images generated by the
internal thumbnailers which do work. is this a bug or have I missed
something.
Thanks !
Rod
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