* cache width, height, and a few more values that are normally re-calculated for each pixel
* make normal sPC a bit faster
* Segment::fade_out() optimization
--> only active in FASTPATH mode, to preserve flash on small devices (8266)
--> code still needs some polishing
--> up to 20% speedup with some 2D effects (esp32, flash qio 80Mhz, -O2)
* optimized fadeToBlackBy() - don't repaint unchanged pixels
* made MIN_HEAP_SIZE configurable by build_flags
* specific error message when not enough memory for LEDs buffer
boot-up delay to fix wifi not starting in some setups
use
`-D WLED_BOOTUPDELAY=500` (or some other delay you want, in milliseconds)
in platformio env definition to add 500ms of delay before hardware init.
* prevent loss of projector when changing segment witdth (mirror).
* prevent unsigned wrap-around "0 -1" for projector
* use aux0 and aux1 segment vars (use them as signed)
* change default NUM_BANDS to 50% - better for smaller panels
* if less than 16 bands : map to full range instead of only showing lower frequencies - same behavious as GEQ 2D.
* require at least a 3x3 setup
* make sure that NUM_BANDS is limited by available columns
* avoid drawing with negative Y
* slightly reduce default "front fill", so that "borders" has a visible effect when running with defaults
* bugfix for Borders (did not work with <16 bands)
* new option for soft light: when checked, the left & right edges of top lights are drawn with anti-aliasing on. Costs us 1-2 fps, so I made it optional.
* made cols/rows integer, to avoid that "cols-x" wraps around
* pre-compute some expressions that don't depend on loop counters
--> wins us 1-4 fps on my 72x72 test setup
* add more accurate version of map() - reduces slight flickering in some 2D effects
* cache fftResult[] in effects (um_data->fftresult might get updated while the effect still calculates)
Only draw what will be visible.
This is a pretty solid speed increase when the adjacent bar is close in height, or if it's taller and would occlude it anyway, it'll be skipped.
