Frank 93b8c63e2b post PR3904 fixes and improvements ...

* fix compiler warnings (uninitialized vars, ambiguous  functions calls)
* restore some lost function prototypes
* avoid negative pixel indices
* only use "fast" color_add when there is no risk of  "overshooting" results
* minor optimizations

2024-04-18 21:09:14 +02:00

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