When an Image is loaded using new Image() you have the option of having it scaled down while preserving the aspect ratio. However, the calculated dimensions are sometimes off by 1 pixel for images that have the exact same aspect ratio due to a rounding error.

A list of input sizes I tried and their resulting size when asking for Images to have a requested width and height of 108x108 pixels while preserving aspect ratio:

 width=800,height=1200 --> resulted in Image of 72.0x108.0
 width=1000,height=1500 --> resulted in Image of 72.0x107.0
 width=1400,height=2100 --> resulted in Image of 72.0x108.0
 width=1440,height=2160 --> resulted in Image of 72.0x108.0
 width=2000,height=3000 --> resulted in Image of 72.0x107.0

When debugging this for one of the cases that resulted in a y dimension of 107, the intermediate value was calculated for sourceHeight * scale was 107.99999, however the code casts this directly to an int and you get 107