Mouse position issue when using SCALED and FULLSCREEN flags at certain resolutions

[bigwhoopgames]

Environment:

You can get some of this info from the text that pops up in the console when you run a pygame program.

Windows 10
pygame-ce 2.3.0.dev1 (SDL 2.26.4, Python 3.11.0)

Current behavior:

Unable to position the mouse to the right most column or bottom row of pixels when in FULLSCREEN mode using the SCALED flag with certain resolutions.

Expected behavior:

The scaled mouse position should accurately reflect the currently highlighted pixel and be able to be positioned on all possible pixels no matter the selected resolution.

Steps to reproduce:

1. Run the below code
2. Attempt to move the mouse to the right most column or bottom most row of pixels.

import pygame
 
pygame.init()
 
# create a window
screen_size = (560, 315)
# screen_size = (512, 288)
screen = pygame.display.set_mode(screen_size, flags = pygame.FULLSCREEN | pygame.SCALED)
# screen = pygame.display.set_mode(screen_size, flags = pygame.SCALED)
pygame.display.set_caption("pygame mouse test")

clock = pygame.time.Clock()

running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
            
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_ESCAPE:
                running = False

    # clear screen
    screen.fill('black')

    # get mouse pos
    mouse_pos = pygame.mouse.get_pos()
    print(mouse_pos)

    # draw mouse pos
    pygame.draw.rect(screen, 'red', pygame.Rect(mouse_pos, (1, 1)))
 
    # update display
    pygame.display.flip()
     
    # tick the clock
    clock.tick()
 
pygame.quit()

[robertpfeiffer]

libsdl-org/SDL#7221

[Starbuck5]

This was fixed in a PR that caused a regression and was reverted for 2.3.0, re-opening.

[bigwhoopgames]

Any update on this?