I am using pyGLFW to create a window and I want to set an icon for the window. I tried to search on the glfw website but it does not support Python.
I am encountering an error when passing the image as a parameter. Please show me how to use glfw.set_window_icon() correctly.
My current code:
def set_icon(self, icon: str):
img = cv2.imread(icon, cv2.IMREAD_UNCHANGED)
if img is None:
return False
h, w = img.shape[:2]
if img.shape[2] == 3:
alpha = numpy.ones((h, w, 1), dtype = numpy.uint8) * 255
img = numpy.concatenate((img, alpha), axis = 2)
img = img.astype(numpy.uint8)
img_data = img.flatten()
glfw_img = (w, h, img_data)
glfw.set_window_icon(self.window, 1, [glfw_img]) # self.window = glfw.create_window(...)
All libraries I'm using:
Error Message:
File "c:\...\lib\graphic\window.py", line 303, in set_icon
glfw.set_window_icon(self.window, 1, [glfw_img])
~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\Legion\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.13_qbz5n2kfra8p0\LocalCache\local-packages\Python313\site-packages\glfw\__init__.py", line 2733, in set_window_icon
_images[i].wrap(image)
~~~~~~~~~~~~~~~^^^^^^^
File "C:\Users\Legion\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.13_qbz5n2kfra8p0\LocalCache\local-packages\Python313\site-packages\glfw\__init__.py", line 275, in wrap
self.pixels_array[i][j][k] = pixels[i][j][k]
~~~~~~~~~^^^
TypeError: 'int' object is not subscriptable
An error with pixels[i][j][k] may suggest that it needs original array 3D instead of .flatten().
The error shows which line of code makes problem so you can check source code /glfw/__init__.py.
else:
self.width, self.height, pixels = image
array_type = ctypes.c_ubyte * 4 * self.width * self.height
self.pixels_array = array_type()
for i in range(self.height):
for j in range(self.width):
for k in range(4):
self.pixels_array[i][j][k] = pixels[i][j][k]
And this also suggests that it needs image as 3D array, not flatten.
It also suggests that it has to be image with transparency RGBA because last loop uses range(4).
BTW:
Code before else also suggests that you can use image loaded with PIL (instead of OpenCV) and it will convert it to RGBA.
if hasattr(image, 'size') and hasattr(image, 'convert'):
# Treat image as PIL/pillow Image object
self.width, self.height = image.size
array_type = ctypes.c_ubyte * 4 * (self.width * self.height)
self.pixels_array = array_type()
pixels = image.convert('RGBA').getdata()
for i, pixel in enumerate(pixels):
self.pixels_array[i] = pixel
To check my guesses I made full working code.
I removed .flatten().
I had to convert from BGR to RGB because OpenCV keeps image as BGR.
I also made code which use PIL instead of OpenCV and it is simpler.
from PIL import Image
img = Image.open(icon)
glfw_img = img # <--- without w, h and without ()
glfw.set_window_icon(window, 1, [glfw_img])
I took example code from official repo: https://github.com/FlorianRhiem/pyGLFW
And here is full working code:
import cv2
import numpy
import glfw
# image generated with ImageMagick:
# convert -size 32x32 -define png:color-type=2 canvas:white empty.png
# or with Python and PIL
# python3 -c 'from PIL import Image;Image.new("RGB", (32,32), color="white").save("empty.png")'
icon = 'empty.png'
def add_icon_pillow(window):
from PIL import Image
img = Image.open(icon)
glfw_img = img # <--- without w, h and without ()
glfw.set_window_icon(window, 1, [glfw_img])
def add_icon_cv2(window):
img = cv2.imread(icon, cv2.IMREAD_UNCHANGED)
img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB) # <--- convert from BGR to RGB
if img is None:
return False
h, w = img.shape[:2]
if img.shape[2] == 3:
alpha = numpy.ones((h, w, 1), dtype = numpy.uint8) * 255
img = numpy.concatenate((img, alpha), axis = 2)
img = img.astype(numpy.uint8)
#img = img.flatten() # <--- remove flatten()
glfw_img = (w, h, img)
glfw.set_window_icon(window, 1, [glfw_img])
def main():
# Example code from official repo: https://github.com/FlorianRhiem/pyGLFW
# Initialize the library
if not glfw.init():
return
# Create a windowed mode window and its OpenGL context
window = glfw.create_window(640, 480, "Hello World", None, None)
if not window:
glfw.terminate()
return
add_icon_cv2(window)
#add_icon_pillow(window)
# Make the window's context current
glfw.make_context_current(window)
# Loop until the user closes the window
while not glfw.window_should_close(window):
# Render here, e.g. using pyOpenGL
# Swap front and back buffers
glfw.swap_buffers(window)
# Poll for and process events
glfw.poll_events()
glfw.terminate()
if __name__ == "__main__":
main()