pygame.transform.rotozoom loses all surface flags

[DickerDackel]

Environment:

pygame-ce 2.3.2 (SDL 2.26.5, Python 3.11.4) on Windows 11

Current behavior:

pygame.transform.rotozoom loses all surface flags, incl. colorkey.

Docs say "The resulting Surface will be a filtered 32-bit Surface.", but from that I don't read that the "features" of the surface will be lost.

Expected behavior:

Returning a surface that preserves surface flags, as all other transforms do (see test script below)

Screenshots

Screenshot and output of test script below

pygame-ce 2.3.2 (SDL 2.26.5, Python 3.11.4)
original <Surface(64x64x32, colorkey=(0, 0, 0, 255))> 0x1000
rotated <Surface(64x64x32, colorkey=(0, 0, 0, 255))> 0x3000
scaled <Surface(64x64x32, colorkey=(0, 0, 0, 255))> 0x3000
smoothscale <Surface(64x64x32, colorkey=(0, 0, 0, 255))> 0x3000
scaled_by <Surface(64x64x32, colorkey=(0, 0, 0, 255))> 0x3000
smoothscale_by <Surface(64x64x32, colorkey=(0, 0, 0, 255))> 0x3000
rotozoom <Surface(64x64x32)> 0x0

Test code

If possible add a simple test program that shows the problem described in this report.

import pygame

TITLE = 'rotozoom test'
SCREEN = pygame.Rect(0, 0, 1024, 768)
FPS = 60
DT_MAX = 3 / FPS

pygame.init()
pygame.display.set_caption(TITLE)
screen = pygame.display.set_mode(SCREEN.size)
clock = pygame.time.Clock()

image = pygame.Surface((64, 64))
image.set_colorkey('black')
pygame.draw.circle(image, 'red', (32, 32), 32, width=0)

images = {
    'original': image,
    'rotated': pygame.transform.rotate(image, 0),
    'scaled': pygame.transform.scale(image, (64, 64)),
    'smoothscale': pygame.transform.smoothscale(image, (64, 64)),
    'scaled_by': pygame.transform.scale_by(image, 1),
    'smoothscale_by': pygame.transform.smoothscale_by(image, 1),
    'rotozoom': pygame.transform.rotozoom(image, 0, 1),
}

for kind, img in images.items():
    print(kind, img, hex(img.get_flags()))

running = True
while running:
    dt = min(clock.tick(FPS) / 1000.0, DT_MAX)

    for e in pygame.event.get():
        match e.type:
            case pygame.QUIT:
                running = False

            case pygame.KEYDOWN if e.key == pygame.K_ESCAPE:
                running = False

    screen.fill('green')
    x = 50
    for i in images:
        screen.blit(images[i], (x, 50))
        x += 100

    pygame.display.flip()

pygame.quit()