IFAKA bf3f270067 fix: add NULL checks for frameBuffer in GfxRenderer (#79) ...

## Problem
`invertScreen()`, `storeBwBuffer()`, and `restoreBwBuffer()` dereference
`frameBuffer` without NULL validation. If the display isn't initialized,
these functions will crash.

## Fix
Add NULL checks before using `frameBuffer` in all three functions.
Follows the existing pattern from `drawPixel()` (line 11) which already
validates the pointer.

Changed `lib/GfxRenderer/GfxRenderer.cpp`.

## Test
- Follows existing validated pattern from `drawPixel()`
- No logic changes - only adds early return on NULL
- Manual device testing appreciated

2025-12-21 13:34:58 +11:00

14 KiB

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