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Investigate using alternative Bitmap formats (e.g. RGB_565) to reduce memory footprint #5853

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@markushi

Explore using lower-memory bitmap configs (RGB_565, etc.) instead of ARGB_8888 where full alpha/color depth isn't needed — e.g. Session Replay screenshot capture — to reduce memory pressure and OOM risk.

Tradeoffs: RGB_565 drops the alpha channel and reduces color depth, so any use needs to be scoped carefully (screenshots vs. general bitmap handling). Related but distinct from #4154 (screenshot export encoding format PNG vs JPEG) — this is about the in-memory Bitmap.Config used during capture, not the exported encoding.

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