I am developing an application in which I want to show the effect of burning an image as -
1) The image starts to burn in the upper right corner
2) It will continue to burn until it reaches the bottom left corner.
3) As a combustion process, its burning part must be invisible.
4) when it reaches the bottom left corner, the whole image should disappear.
I tried to find a solution, but ended up pulling my hair out. Please help me with your suggestions.
The following image can help you get my idea, 
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