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Optimize VNC and ZRLE decoding loops by replacing expensive coordinate arithmetic (division, modulo, and repeated multiplications) with incremental row-base tracking and column counters. This "strength reduction" optimization is particularly effective on mobile ARM architectures where integer division can be 20-80x slower than addition. - ZrleDecoder: Updated decodeTile to use tileRowBase; eliminated / tw and % tw in RLE handlers using currCol/currRowBase increments. - VncClient: Optimized ENC_RAW and ENC_COPY_RECT loops to use incremental rowBase tracking. Co-authored-by: kimocoder <4252297+kimocoder@users.noreply.github.com>
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💡 What: Optimized RFB decoding loops in
VncClient.ktandZrleDecoder.ktusing strength reduction.🎯 Why: Repeated multiplications, divisions, and modulo operations in tight pixel loops are expensive on ARM-based mobile devices.
📊 Impact: Expected to reduce CPU overhead during VNC screen updates and improve frame rates for high-resolution or high-entropy updates.
🔬 Measurement: Verified with
./gradlew :app:testDebugUnitTest --tests "com.excp.podroid.x11.*Test".PR created automatically by Jules for task 13546075656163325268 started by @kimocoder