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What does this C code do [Duffs device]? - Stack Overflow Duff's device In computer science, Duff's device is an optimized implementation of a serial copy that uses a technique widely applied in assembly language for loop unwinding
How does Duffs device work? - Stack Overflow Duff's device deals with serial copying, rather than just any old problem, but is a classic example of how optimisations can be made by reducing the number of times that a comparison needs to be done in a loop
c - Nested case statements - Stack Overflow The easiest way to understand Duff's device is to separate its two logical components, the switch and the do while loop, from each other Here is a logically equivalent implementation, where the two statements are no longer nested:
Drawing on Canvas - PorterDuff. Mode. CLEAR draws black! Why? arcPaint = new Paint(); arcPaint setAntiAlias(true); arcPaint setColor(Color RED); Color doesn't matter Now, everything draws great, but the background is BLACK in whole View If I set canvas drawColor( , PorterDuff Mode DST) and omit canvas drawBitmap() - the arc is drawn properly on transparent background My question is - how to set PorterDuff modes to make it work with transparency